Method for installing prestressed cable for steel-wood structure
By using a high-altitude working sliding platform and monitoring equipment in the steel-wood structure, precise tensioning of prestressed cables and construction monitoring are achieved, solving the problems of insufficient construction accuracy, poor material coordination and complex process in the existing technology, and improving construction safety and efficiency.
Patent Information
- Application Number
- CN202510869977.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-26
- Publication Date
- 2025-09-05
AI Technical Summary
Existing prestressed cable installation methods in steel-wood structures have problems such as insufficient construction accuracy, poor material coordination, complex and high-cost processes, long construction periods, high safety risks, and theoretical design limitations. In particular, in large-span structures, steel-wood joints are prone to instability and stiffness distribution is difficult.
The cables are deployed using a high-altitude working sliding platform, a winch, a fixed pulley and a cable-unfolding trolley. The cables are fixed with cable clamps and bolts. Combined with monitoring by a total station and oil pressure sensors, precise tensioning and construction monitoring of the prestressed cables are achieved to ensure uniform cable force and symmetry of the structural stress.
It improves the safety and efficiency of steel-wood structure construction, reduces costs, shortens construction period, enhances the safety and accuracy of the construction process, and is suitable for a variety of large-span structures.
Smart Images
Figure CN120592415A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of steel-wood structure construction, and in particular to a method for installing prestressed cables for steel-wood structures. Background Art
[0002] The application of prestressed cables in steel-timber structures aims to combine the tensile strengths of steel with the compressive strengths of wood, meeting the demands for lightweight, long spans, and lateral resistance. Its technological development can be traced back to the 1970s, when the beam-string system was developed. This self-balancing system, formed by steel beams and prestressed cables, significantly improved stiffness and span performance. In steel-timber composite structures, prestressed cables compensate for the tensile weakness of wood. Existing prestressed cable installation methods primarily include "length control" and "tension control" tensioning techniques. This technology has been applied in practical projects such as stadiums and bridges, but it is still in need of further optimization due to factors such as differences in material properties, construction accuracy, and simplified theoretical models.
[0003] Although existing technologies have solved the efficiency and safety issues of long-span structure construction to a certain extent, they still have the following key defects: The construction precision is insufficient, and the steel-wood joints are prone to uneven cable force distribution due to changes in temperature and humidity or installation errors, causing structural instability; the material coordination is poor, and the swelling, shrinkage, and creep characteristics of wood conflict with the rigidity of steel. Long-term use can easily cause prestress loss or corrosion of the anchoring system; the process is complex and costly, and large-span structures require multi-stage tensioning, temporary support, and high-altitude operations, resulting in a long construction period and high safety risks; economy and efficiency are in conflict, and the process relies on special equipment and high-precision material processing. Wood processing deviations often require on-site adjustments, increasing costs; theoretical design is limited, and the existing model simplifies the nonlinear coupling effect of materials, and parameter optimization (such as the rise-to-span ratio) relies on experience, resulting in actual force deviations and resource redundancy.
[0004] The steel-wood composite structure is a mixed structure. The deformation capacity of steel and wood is inconsistent, which makes it difficult to distribute the stiffness during construction. The stiffness distribution of the steel-wood truss composite structure is greatly affected by processing and installation errors.
[0005] Based on this, the present invention designs a method for installing prestressed cables for steel-wood structures to solve the above problems. Summary of the Invention
[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a method for installing prestressed cables for steel-wood structures.
[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for installing prestressed cables for steel-wood structures includes a prestressed cable construction method and a construction monitoring method. The prestressed cable construction method includes the following steps: Step 1: Build an aerial work platform for installing the cable, install the winch and fixed pulley; transport the cable reel to the construction site, and use a crane to lift the cable reel onto the aerial work platform; Step 2: Unwind the cable coil and then use the winch and cable unwinding trolley to unwind the cable coil; Step 3: Install the cable head, pin shaft and cover plate at both ends of the cable body; make the cable head form an integral force-bearing system and complete the installation of the tensioning end; Step 4: Install the cable clamp on the cable body; then tension the cable body synchronously from both sides.
[0008] Furthermore, during the process of unfolding the open cable, the outer protective layer is not removed, and only the protection at the cable clamp is stripped off, so that in subsequent construction, care is taken to avoid bumping or scratching the cable body.
[0009] Furthermore, during the cable extension process, a winch is used to pull the cable head, which is placed on a cable extension trolley, and the cable is slowly extended on the construction site; under the extended cable body, cable extension rollers are placed every 5 to 6 meters to prevent the extended prestressed cable from rubbing against the ground and damaging the cable.
[0010] Furthermore, the winch is fixed on the existing steel-wood hybrid structure column.
[0011] Furthermore, the installation method of the cable clamp is as follows: when the cable is manufactured, the position of the cable clamp is marked on the surface of the cable body under tension; the cable clamp is divided into upper and lower plates. After the upper and lower plates of the cable clamp clamp the cable, the bolts are passed through the bolt holes for initial tightening. The initial tightening is performed in a diagonal cross order, and the initial tightening torque is ~% of the final tightening torque; after all the bolts are installed and the initial tightening is completed, the bolts are tightened with the final tightening torque in the same order as the initial tightening.
[0012] Furthermore, the cable tensioning method is: first debug the equipment to pre-tighten the cable body, and then gradually apply prestress until the prestress reaches 95% of the specified cable force; after the prestressed cable is stable, perform a second fine-tuning.
[0013] Furthermore, the construction monitoring method includes a monitoring method and a negative feedback control method; The monitoring method is: to monitor the tension of all actively tensioned cables, and to monitor the deformation in the area with the largest deformation in the initial state; during the construction process, the tension and deformation data are continuously observed.
[0014] Furthermore, in the construction monitoring method, a total station is used to detect the deformation of the cable.
[0015] Furthermore, in the construction monitoring method, an oil pressure sensor installed on the hydraulic jack oil pump is used to monitor the tension of the prestressed steel cable.
[0016] Furthermore, by monitoring the tension and deformation data fed back from the points, it is possible to determine whether there is uneven tensioning of the cables during the tensioning process of the structural system, or whether the deformation does not correspond to the designed tension when the tension reaches the designed tension, and to make targeted operations to ensure the safety of the tensioning. If the tensioning cable is uneven, the tension values at both ends of the tensioning can be adjusted; if the deformation value does not match the designed value, deformation control is given priority, and the cable tension is continued to be adjusted until the deformation reaches the monitoring prediction value.
[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the present application provides a method for installing prestressed cables for steel-wood structures, which can be applied to the tensioning construction process of prestressed cables of steel-wood composite hybrid structures. Due to the inconsistent deformation capabilities of steel and wood in the steel-wood composite hybrid structure, the stiffness distribution during the construction process is difficult and the stiffness distribution of the steel-wood truss composite structure is greatly affected by processing and installation errors. The simultaneous symmetrical tensioning of both sides of the prestressed cables ensures the force symmetry of the main structure during the entire construction process; the prestressed cable tensioning tooling equipment such as a winch, a fixed pulley, a cable-unfolding trolley, a cable-unfolding roller, and a flatbed truck not only solves the problem of difficulty in unfolding the prestressed cables at high altitudes, but also ensures the quality of the cable unfolding; the method is simple to operate, saves construction time and economic costs, increases the construction safety of the steel-wood composite structure under high-altitude operations, and has a wide range of applications and a high degree of popularization. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.
[0019] Figure 1 This is a schematic diagram of a steel-wood composite truss; Figure 2 Schematic diagram of the cable structure; Figure 3 This is a schematic diagram of the construction monitoring points; Figure 4 Schematic diagram of the pin structure; Figure 5 Mark the position of the guy wire clip; Figure 6 Instructions for the cable clamp marking line.
[0020] The numbers in the figure represent: 1. Steel-wood hybrid structure; 2. Cable; 21. Cable head; 22. Cable body; 3. Cable clamp; 4. Strut; 5. Aerial work sliding platform; 51. Winch; 52. Fixed pulley. DETAILED DESCRIPTION
[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.
[0022] The terms “left,” “right,” “front,” “back,” “up,” and “down” mentioned in the following description are oriented in the viewing direction of the front view.
[0023] Example 1: In some embodiments, please refer to the accompanying drawings of the specification. Figures 1-6 , a method for installing prestressed cables for steel-wood structures, including a prestressed cable construction method and a construction monitoring method; The prestressed cable construction method includes the following steps: Step 1: Build an aerial work sliding platform 5 for installing the cable 2, install the winch 51 and the fixed pulley 52; transport the cable reel to the construction site, and use a crane to lift the cable reel onto the aerial work sliding platform 5; The cable 2 is wound on a cable drum for easy transportation, transport and storage, and one cable 2 is wound into a cable drum; Step 2: Unwind the cable coil and then use the winch 51 and the cable unwinding trolley to unwind the cable coil; During the unwinding process of the cable 2, the elasticity generated by the winding of the cable and the eccentric force generated by the traction cause the cable to accelerate when unwinding, causing the cable to bounce open and easily endanger the safety of the workers. Therefore, care should be taken to prevent collapse when unwinding. The soft cable is relatively flexible. During the unfolding process of the unwinding cable 2, the outer protective layer is not removed, and only the protection at the cable clamp 3 is peeled off. Therefore, in subsequent construction, care should be taken to avoid bumping or scratching the cable body 22.
[0024] During the unwinding of the cable 2, the cable head 21 is pulled by a winch 51 and placed on a cable unwinding trolley, and the cable 2 is slowly unwound on the construction site. A movable pulley is provided to lower the required unwinding material. A roller is provided at each axis turning point to ensure the basic linear shape of the cable 2 after unwinding. Under the unfolded cable body 22, cable-unfolding rollers are placed every 5 to 6 meters to prevent the unfolded prestressed cables 2 from rubbing against the ground and damaging the cables 2.
[0025] Step 3: Install the cable head 21, pin shaft and cover plate at both ends of the cable body 22; make the cable head 21 form an integral force-bearing system, and complete the installation of the tensioning end; Use a car crane to lift the cable head 21 of the prestressed cable 2 to the vicinity of the ear plate of the cable 2, use the winch 51 and the temporary measures of the set sling to fine-tune the positioning of the cable head 21 of the prestressed cable 2, complete the installation of the cable head 21 of the prestressed cable 2, and ensure the reliability during the prestressing process.
[0026] The winch 51 is fixed on the column of the existing steel-wood hybrid structure 1, and the main structure is utilized to reduce material loss.
[0027] After the prestressed cable head 21 is installed in place, the pin of the prestressed cable head 21 is passed through and the cover plate is installed to form an integral force-bearing system with the prestressed cable head 21, completing the installation of the tensioning end; Step 4: Install the cable clamp 3 on the cable body 22; and then tension the cable body 22 from both sides simultaneously.
[0028] The cable 2 is in a zero stress state when installed, and its length cannot be measured on site; The installation method of the cable clamp 3 is as follows: when the cable 2 is manufactured, the position of the cable clamp 3 is marked on the surface of the cable body 22 under tension; the cable clamp 3 is divided into upper and lower plates. After the upper and lower plates of the cable clamp 3 clamp the cable 2, the bolts are passed through the bolt holes for initial tightening. The initial tightening is performed in a diagonal cross order, and the initial tightening torque is 30~50% of the final tightening torque; after the bolts are installed and the initial tightening is completed, the bolts are tightened with the final tightening torque in the same order as the initial tightening.
[0029] The tensioning method of the cable body 22 is as follows: first, the equipment is debugged to pre-tighten the cable body 22, and then the prestress is gradually applied until the prestress reaches 95% of the specified cable force; after the prestressed cable is stable, a secondary fine adjustment is performed; Precise application of prestress is achieved, ensuring the linear accuracy of the prestressed cables.
[0030] Construction monitoring methods include monitoring methods and negative feedback control methods; The monitoring method is as follows: the tension of all actively tensioned cables 2 is monitored, and the deformation is monitored in the area with the largest deformation in the initial state; during the construction process, the tension and deformation data are continuously observed; During the tensioning process, uneven cable tensioning and inconsistent deformation may occur when the tension reaches the design cable tension. By monitoring the tension and deformation data fed back from the points, it is possible to determine whether the structural system has uneven cable tensioning and inconsistent deformation when the tension reaches the design cable tension; and to make targeted operations to ensure tensioning safety.
[0031] During the initial tensioning, the main focus is on cable tension control, while during the secondary tensioning fine-tuning, the main focus is on deformation control.
[0032] In the construction monitoring method, a total station is used to detect the deformation of the cable 2; Total station, with an angle measurement accuracy of more than 1 second and a distance measurement accuracy of ±1+2ppm×Dmm; In the construction monitoring method, an oil pressure sensor installed on the hydraulic jack oil pump is used to monitor the tension of the prestressed steel cable 2; The negative feedback control method is to monitor the tension and deformation data of the prestressed cables in real time. If the tension is uneven, the tension values at both ends can be adjusted. If the deformation value does not match the design value, deformation control is given priority and the cable tension is continued until the deformation reaches the monitoring predicted value. This feedback of negative information is used to correct deviations from the target, and the visualization of internal force, displacement and other indicators throughout the construction process is achieved, ensuring the linear control accuracy of the prestressed cables during construction. After the tensioning is completed, the struts 4 are installed to support the cables 2 so that the cables maintain the designed geometric shape during the installation process.
[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.
Claims
1. A method for installing prestressed cables for steel-wood structures, comprising a prestressed cable construction method and a construction monitoring method, characterized in that: The prestressed cable construction method includes the following steps: Step 1: Build a high-altitude working sliding platform (5) for installing the cable (2), install a winch (51) and a fixed pulley (52); and transport the cable roll to the construction site, and use a crane to lift the cable roll onto the high-altitude working sliding platform (5); Step 2: Unwind the cable coil and then use the winch (51) and the cable unwinding trolley to unwind the cable coil; Step 3: Install the cable head (21), the pin shaft and the cover plate at both ends of the cable body (22); make the cable head (21) form an integral force-bearing system, and complete the installation of the tensioning end; Step 4: Install the cable clamp (3) on the cable body (22); and then simultaneously complete the tensioning of the cable body (22) from both sides.
2. The method for installing prestressed cables for steel-wood structures according to claim 1, characterized in that: During the unfolding process of the open cable (2), the outer protective layer is not removed, and only the protection at the cable clamp (3) is peeled off, so that in subsequent construction, care is taken to avoid bruising or scratching the cable body (22).
3. The method for installing prestressed cables for steel-wood structures according to claim 1, characterized in that: During the process of extending the cable (2), the cable head (21) is pulled by a winch (51), and the cable head (21) is placed on a cable extension trolley, and the cable (2) is slowly extended on the construction site; under the extended cable body (22), rollers for extending the cable are placed every 5 to 6 meters to prevent the extended prestressed cable (2) from rubbing against the ground and damaging the cable (2).
4. The method for installing prestressed cables for steel-wood structures according to claim 1, characterized in that: The winch (51) is fixed on the column of the existing steel-wood hybrid structure (1).
5. The method for installing prestressed cables for steel-wood structures according to claim 1, characterized in that: The installation method of the cable clamp (3) is as follows: when the cable (2) is manufactured, the position of the cable clamp (3) is marked on the surface of the cable body (22) under tension; the cable clamp (3) is divided into an upper and lower clamping plate, and after the upper and lower clamping plates of the cable clamp (3) clamp the cable (2), the bolts are passed through the bolt holes for initial tightening, and the initial tightening is performed in a diagonal cross order, and the initial tightening torque is 30-50% of the final tightening torque; after the bolts are installed and the initial tightening is completed, the bolts are tightened with the final tightening torque, and the order is the same as the initial tightening order.
6. The method for installing prestressed cables for steel-wood structures according to claim 1, characterized in that: The tensioning method of the cable body (22) is as follows: first, the equipment is debugged to pre-tighten the cable body (22), and then the prestress is gradually applied until the prestress reaches 95% of the specified cable force; After the prestressed cables are stable, a second fine adjustment will be carried out.
7. The method for installing prestressed cables for steel-wood structures according to claim 1, characterized in that: Construction monitoring methods include monitoring methods and negative feedback control methods; The monitoring method is: monitoring the tension of all actively tensioned cables (2), and monitoring the deformation of the area with the largest deformation in the initial state; During the construction process, the tension and deformation data are continuously observed.
8. The method for installing prestressed cables for steel-wood structures according to claim 7, characterized in that: In the construction monitoring method, a total station is used to detect the deformation of the cable (2).
9. The method for installing prestressed cables for steel-wood structures according to claim 7, characterized in that: In the construction monitoring method, an oil pressure sensor installed on the hydraulic jack oil pump is used to monitor the tension of the prestressed steel cable (2).
10. The method for installing prestressed cables for steel-wood structures according to claim 7, wherein: The negative feedback control method is to monitor the tension and deformation data of the prestressed cables in real time. By monitoring the tension and deformation data fed back from the monitoring points, it is determined whether there is uneven tensioning of the cables during the tensioning process of the structural system, and whether the deformation does not correspond when the tension reaches the design cable tension. Targeted operations can be made to ensure tensioning safety. If the tensioning cable force is uneven, the cable force values at both ends of the tensioning can be adjusted.