A connecting conversion system satisfying the lifting condition of double-cantilever truss
Patent Information
- Application Number
- CN202521790021.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-22
- Publication Date
- 2026-10-23
- Estimated Expiration
- 2035-08-22
AI Technical Summary
[0004]本实用新型所要解决的技术问题是 ：提供一种满足双悬挑桁架提升条件的连接转换系统，用以解决传统双悬挑桁架施工麻烦，施工工期长、效率低、成本高的问题
与传统钢桁架相比，本申请通过采用连接装置将结构两侧悬挑桁架结构临时形成一个整体，满足桁架整体提升条件。大部分作业从现有技术的空中施工改变为地面施工，不仅有利于保证焊接质量，也有利于施工安全及工期控制；施工方便，同时也提高了施工效率和降低了施工成本。
Smart Images
Figure CN224884926U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of building construction technology, and in particular relates to a connection and conversion system that meets the lifting conditions of double cantilever trusses. Background Technology
[0002] Large-span steel trusses are a commonly used structural form for high-altitude connecting corridors. They offer advantages such as reasonable stress distribution, convenient construction, good seismic performance, high structural rigidity, good overall stability, standardized assembly, and excellent economic efficiency. Looking at future trends, the spans of connecting corridors will become increasingly larger, and construction site environments will become increasingly complex, inevitably leading to increased construction difficulties.
[0003] A double-cantilever truss is a structural form in which the towers at both ends cantilever inwards, with the gap in the middle serving as a seismic joint. Since a single cantilever truss is difficult to lift independently, traditional double-cantilever trusses are typically constructed using temporary supports and high-altitude assembly methods. However, temporary supports, due to their inherent stability, should not be installed too high; this installation technique is more suitable for lower-height truss structures. For higher-height trusses, this method requires diagonal temporary supports on both towers, which incurs additional tower reinforcement costs and corresponding construction time, and the removal of the diagonal supports at the bottom of the truss also presents certain difficulties. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a connection and conversion system that meets the lifting conditions of a double cantilever truss, so as to solve the problems of cumbersome construction, long construction period, low efficiency and high cost of traditional double cantilever trusses.
[0005] To achieve the above-mentioned technical effects, the technical solution adopted by this utility model is as follows: A connection and conversion system that meets the lifting conditions of a double cantilever truss includes a left cantilever truss and a right cantilever truss. The system is characterized by further including a connection device, which comprises a connecting block and two first connecting plates. The connecting block is made of H-beams and its length is adapted to the gap between the left and right cantilever trusses. Both ends of the connecting block are welded to the truss chords of the left and right cantilever trusses, respectively. The two first connecting plates are symmetrically attached to the same side of the web of the connecting block. The left end of one first connecting plate is fixedly connected to the truss chord of the left cantilever truss, and the right end of the other first connecting plate is fixedly connected to the truss chord of the right cantilever truss. Multiple matching circular bolt holes are provided between the two first connecting plates and the web of the connecting block. The two first connecting plates and the connecting block are fixedly connected by high-strength bolts passing through the bolt holes.
[0006] Furthermore, it also includes an unloading device, which has two identical clamping plates and two identical second connecting plates, and the clamping plates and the second connecting plates are at the same height; the two second connecting plates are symmetrically clamped between the two clamping plates, and the second connecting plates are aligned with the transverse center of the clamping plates, and the outer ends of the two second connecting plates extend out of the corresponding ends of the clamping plates; the outer ends of the two second connecting plates are respectively fixedly connected to the truss web members at the corresponding ends, and a plurality of mutually matching connecting holes are provided between the two clamping plates and the two second connecting plates. The connecting holes are vertical elongated holes, and the two clamping plates and the two second connecting plates are fixedly connected by bolts passing through the elongated holes.
[0007] Furthermore, the connecting device is provided in three sets, which are located at the upper chord, middle chord, and lower chord of the left and right cantilever trusses, respectively.
[0008] Furthermore, the unloading device is provided in two sets, which are located at the middle position of the middle web members of the upper middle chord and the middle position of the middle lower chord of the left and right cantilever trusses, respectively.
[0009] Furthermore, the width of the connecting block is the same as the width of the truss chord.
[0010] Furthermore, the second connecting plate is a flat steel plate, and the two second connecting plates are welded and fixed to the left cantilever truss or the right cantilever truss respectively.
[0011] Furthermore, the second connecting plate is an angle steel, and the two second connecting plates are locked and fixed to the left cantilever truss or the right cantilever truss by high-strength bolts.
[0012] Compared with the prior art, the beneficial effects of this utility model are: Compared to traditional steel trusses, this application uses a connecting device to temporarily form a whole from the cantilevered trusses on both sides of the structure, thus meeting the requirements for overall truss lifting. Most of the work is changed from aerial construction in existing technologies to ground construction, which not only helps ensure welding quality but also improves construction safety and schedule control; construction is convenient, while also increasing efficiency and reducing costs.
[0013] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. Attached Figure Description
[0014] Figure 1 This is an elevation view of the connection and conversion system of this utility model; Figure 2 This is an elevation view of the connection structure between the connecting device and the truss chord of this utility model; Figure 3 This is a plan view of the connection structure between the connecting device and the truss chord of this utility model; Figure 4 This is an elevation view of the connection structure between the unloading device and the truss web members of this utility model; Figure 5 This is a plan view of the connection structure between the unloading device and the truss web members of this utility model; Figure 6 A ratio diagram showing the calculation results of the steel structure for removing the connecting devices; Figure 7 Stress analysis diagram of the unloading device after the connecting device is removed; Figure 8 A ratio diagram showing the calculation results of the steel structure for dismantling the unloading device.
[0015] The labels and their corresponding names in the diagram are as follows: 1a. Left cantilever truss, 11. Chord, 12. Web member, 1b. Right cantilever truss; 2. Connecting device; 21. Connecting block; 22. First connecting plate; 3. Unloading device; 31. Clamping plate; 32. Second connecting plate, 4. High-strength bolts. Detailed Implementation
[0016] A connection and conversion system that meets the lifting conditions of a double cantilever truss, such as Figure 1 As shown, the connection and conversion system includes a left cantilever truss 1a, a right cantilever truss 1b, a connecting device 2, and an unloading device 3. Both the connecting device 2 and the unloading device 3 connect the left cantilever truss 1a and the right cantilever truss 1b, forming a single integrated structure and providing feasible conditions for lifting. After lifting, staged unloading is performed to ensure a stable unloading process.
[0017] like Figure 2 , 3As shown, the connecting device 2 includes a connecting block 21 and two identical first connecting plates 22. The connecting block 21 is made of H-beams, and its length is adapted to the gap between the left cantilever truss 1a and the right cantilever truss 1b. The connecting block 21 is welded to the truss chords 11 of the left cantilever truss 1a and the right cantilever truss 1b respectively via its upper and lower flanges. The two first connecting plates 22 are symmetrically attached to the same end of the web of the connecting block 21. The left end of one first connecting plate 22 is welded to the truss chord 11 of the left cantilever truss 1a, and the right end of the other first connecting plate 22 is welded to the truss chord 11 of the right cantilever truss 1b. Multiple matching circular bolt holes are provided between the web of the two first connecting plates 22 and the connecting block 21. The two first connecting plates 22 and the connecting block 21 are fixedly connected by high-strength bolts 4 passing through the bolt holes.
[0018] like Figure 4 , 5 As shown, the unloading device 3 has two identical clamping plates 31 and two identical second connecting plates 32, and the clamping plates 31 and the second connecting plates 32 are at the same height. The two second connecting plates 32 are symmetrically clamped between the two clamping plates 31, and the second connecting plates 32 are aligned with the transverse center of the clamping plates 31. The outer ends of the two second connecting plates 32 extend beyond the corresponding ends of the clamping plates 31. The outer ends of the two second connecting plates 32 are respectively fixedly connected to the corresponding truss web members 12. Multiple matching connecting holes are provided between the two clamping plates 31 and the two second connecting plates 32. The connecting holes are vertical elongated holes (e.g., ...). Figure 6 As shown, the two clamping plates 31 and the two second connecting plates 32 are fixedly connected by bolts passing through elongated holes. The second connecting plates 32 are made of rectangular steel plates, and the corresponding ends of the two second connecting plates 32 are welded and fixed to the left cantilever truss 1a or the right cantilever truss 1b. The length of the clamping plate 31 and the sum of the widths of the two second connecting plates 32 are slightly smaller than the distance between the left cantilever truss 1a and the right cantilever truss 1b. Preferably, the size of the second connecting plates 32 is designed to be half the size of the clamping plates 31.
[0019] In this embodiment, three sets of connecting devices 2 are provided, corresponding to the upper chord, middle chord, and lower chord positions of the left cantilever truss 1a and the right cantilever truss 1b, and are connected along the length of the chord members 11 on both sides. Two sets of unloading devices 3 are provided, corresponding to the middle positions of the middle web members 12 of the upper and middle chords of the left cantilever truss 1a and the right cantilever truss 1b, and the middle positions of the middle web members 12 of the middle and lower chords. The truss chord members 11 and the connecting blocks 21 are all made of H800X400X30X30 steel sections, with their upper and lower flanges welded to the truss chord members 11. The first connecting plate 22, the second connecting plate 32, and the clamping plate 31 are all made of 30mm thick plates, and the material is Q355B. In the connecting device 2, two rows of a total of 12 sets of M30 torsion-shear type high-strength bolts 4 are arranged between the connecting block 21 and the two first connecting plates 22. The bolt grade is HS10.9, the bolt spacing is 100mm, and the bolt edge distance is 75mm. In the unloading device 3, two rows of a total of 10 sets of M20 torsion-shear type high-strength bolts 4 are arranged between the two clamping plates 31 and the two connecting plates. The bolt grade is HS10.9, the bolt spacing is 65mm, and the bolt edge distance is 70mm. When using this device for the lifting construction of the double cantilever truss (including the unloading construction after lifting), the double cantilever trusses on both sides are first connected into an integral structure through the connecting device 2 and the unloading device 3, and then the overall lifting construction is carried out. After the lifting is completed, the secondary unloading technology is then carried out. During unloading, the unloading sequence is to first remove the connecting device 2 and then remove the unloading device 3. Each unloading point needs to be unloaded simultaneously (that is, the unloading points of the connecting device 2 need to be unloaded simultaneously, and the unloading points of the unloading device 3 need to be unloaded simultaneously). This utility model first disconnects the temporary connection device 2 by loosening the bolts of the lower chord, middle chord, and upper chord connection device 2 of the cantilever truss. Due to the connection of the unloading device 3, software simulation is used to... Figure 6 As shown in the ratio diagram of the steel structure verification results for the dismantling connection device 2, the stress and deformation during the unloading process are within a controllable range. Based on the maximum vertical displacement value at the position of the second connecting plate 32 at this time, drilling a certain length (approximately 5mm) of elongated bolt holes downwards in the unloading device 3 can meet the initial stress release requirements of the truss (such as...). Figure 7 (As shown). After the deformation of the long oval bolt holes of the double cantilever truss lifting and unloading device 3 is completed, the unloading device 3 is cut off to release the remaining stress and perform secondary unloading. Each truss is unloaded simultaneously. First, the bolts are cut off and removed, and finally the steel plates are disconnected to create seismic joints. Before and after unloading, reflective patches need to be installed at the location of the unloading device 3 to observe the deformation. After unloading is completed, from Figure 8 It can be seen that the truss is stable as a whole and the secondary deformation is within the allowable range of the specification, which plays the role of unloading in stages and releasing stress in batches.
[0020] This invention employs a combination of a bolted-welded lifting connection device and an unloading device to lift and unload the double cantilever truss as a whole. The bolted-welded joint connection device forms the double cantilever steel truss into a single unit. A two-stage unloading technique is used: first, the lifting connection device is removed, and the lifting unloading device releases some of the unloading stress, completing the first stage of unloading; then, the unloading device is removed to release the remaining stress, completing the overall unloading of the steel truss. The unloading device is designed with bolted connections, and the bolted joints ensure a smooth stress release during unloading. The connecting holes are machined into elongated ovals to facilitate the release and control of deformation. This invention ensures structural stability during the unloading of the double cantilever truss, reduces swaying during unloading, ensures the safety of unloading workers, and also improves construction efficiency and reduces construction costs.
[0021] This utility model is not limited to the specific embodiments described above. For those skilled in the art, all modifications made based on the above concept without creative effort fall within the protection scope of this utility model.
Claims
1. A connection and conversion system that satisfies the lifting conditions of a double cantilever truss, comprising a left cantilever truss and a right cantilever truss, characterized in that, It also includes a connecting device, which has a connecting block and two first connecting plates. The connecting block is made of H-beams and its length is adapted to the gap between the left and right cantilever trusses. The two ends of the connecting block are welded to the truss chords of the left and right cantilever trusses, respectively. The two first connecting plates are symmetrically attached to the same end of the web of the connecting block. The left end of one first connecting plate is fixedly connected to the truss chord of the left cantilever truss, and the right end of the other first connecting plate is fixedly connected to the truss chord of the right cantilever truss. There are multiple matching circular bolt holes between the two first connecting plates and the web of the connecting block. The two first connecting plates and the connecting block are fixedly connected by high-strength bolts passing through the bolt holes.
2. The connection and conversion system for satisfying the lifting conditions of a double cantilever truss according to claim 1, characterized in that, It also includes an unloading device, which has two identical clamping plates and two identical second connecting plates, and the clamping plates and the second connecting plates are at the same height; the two second connecting plates are symmetrically clamped between the two clamping plates, and the second connecting plates are aligned with the transverse center of the clamping plates, and the outer ends of the two second connecting plates extend out of the corresponding ends of the clamping plates; the outer ends of the two second connecting plates are respectively fixedly connected to the truss web members at the corresponding ends, and a plurality of mutually matching connecting holes are provided between the two clamping plates and the two second connecting plates. The connecting holes are vertical elongated holes, and the two clamping plates and the two second connecting plates are fixedly connected by bolts passing through the elongated holes.
3. The connection and conversion system for satisfying the lifting conditions of a double cantilever truss according to claim 2, characterized in that, The connecting device is provided in three sets, which are located at the upper chord, middle chord, and lower chord of the left and right cantilever trusses, respectively.
4. The connection and conversion system for satisfying the lifting conditions of a double cantilever truss according to claim 3, characterized in that, The unloading device is provided in two sets, which are located at the middle position of the middle web members of the upper middle chord and the middle web members of the lower middle chord of the left and right cantilever trusses, respectively.
5. A connection and conversion system that satisfies the lifting conditions of a double cantilever truss according to any one of claims 1-4, characterized in that, The width of the connecting block is the same as the width of the truss chord.
6. A connection and conversion system that satisfies the lifting conditions of a double cantilever truss according to any one of claims 2-4, characterized in that, The second connecting plate is a flat steel plate, and the two second connecting plates are welded and fixed to the left cantilever truss or the right cantilever truss respectively.
7. A connection and conversion system that satisfies the lifting conditions of a double cantilever truss according to any one of claims 2-4, characterized in that, The second connecting plate is an angle steel, and the two second connecting plates are locked and fixed to the left cantilever truss or the right cantilever truss by high-strength bolts.