A prestressed tendon blanking protection device
The combination of support frame and conical protective frame solved the problems of dispersion and rebound during the prestressed tendon cutting construction, and achieved stable cutting and safe construction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SINOHYDRO BUREAU 14 CO LTD
- Filing Date
- 2025-09-24
- Publication Date
- 2026-07-07
AI Technical Summary
The existing wire laying frame cannot effectively restrain the prestressed tendons, which can easily lead to dispersion or rebound shrinkage during material cutting and construction, affecting the construction progress and posing safety hazards.
The system employs a combination structure of support frame, sleeve, force-bearing stop bar, and conical protective frame. The force-bearing stop bar longitudinally limits the prestressing tendon reel, while the conical protective frame constrains the pulled-out prestressing tendons to prevent dispersion and rebound.
This effectively avoids the dispersion and rebound of prestressed tendons during the material cutting and construction process, eliminates safety hazards, and improves construction efficiency and safety.
Smart Images
Figure CN224467203U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of prestressed tendon cutting construction technology, specifically, it relates to a prestressed tendon cutting protective device. Background Technology
[0002] Prestressed concrete structures are structures in which prestressing tendons are tensioned to apply pressure before the structure bears external loads. This pressure is used to generate compressive stress in the tension zone of the concrete when subjected to external loads, thus offsetting or reducing the tensile stress generated by the external loads. This prevents cracking or significantly reduces the width of cracks under normal use. Prestressing tendons are usually composed of single or bundled steel wires, strands, or bars, and are used to pre-apply compressive stress to concrete members. In pre-tensioning production, threaded bars, indented wires, or strands are generally used to ensure reliable bonding with concrete. In post-tensioning production, smooth bars, smooth wires, or strands are used.
[0003] The steel wires and strands used as prestressing tendons are usually stored and supplied in the form of reels. In the existing technology, a wire-laying frame is usually used to unwind the steel strands on the reel before cutting and threading them. However, because prestressing tendons have a strong elastic shrinkage and deformation capacity, the existing wire-laying frame cannot restrain the prestressing tendons, which can easily lead to the phenomenon of instantaneous unloading and loosening of the prestressing tendons. This can cause the prestressing tendons to disperse or rebound and shrink during the cutting process. Organizing the prestressing tendons is time-consuming and labor-intensive, affecting the construction progress. At the same time, the cutting process of prestressing tendons poses a safety hazard that can easily cause personnel injury. Utility Model Content
[0004] To solve or partially solve the problems existing in related technologies, this utility model provides a prestressed tendon cutting protection device, which can effectively prevent the prestressed tendons from dispersing or rebounding during the cutting process, eliminating the safety hazards that can easily cause personnel injury due to the dispersion or rebound of prestressed tendons. It is easy to operate and use, and the supply of prestressed tendons is stable, which is conducive to ensuring the construction progress.
[0005] This application provides a prestressed tendon cutting protection device, including a support frame, a tendon sleeve, a force-bearing stop bar, and a conical protective frame; the support frame is a square frame structure, the support frame includes four columns and a top crossbeam and a support crossbeam, the top crossbeam is fixedly installed between the upper ends of adjacent columns, and the support crossbeam is horizontally fixedly installed between the lower parts of adjacent columns, and the support crossbeam is set off from the ground.
[0006] The sleeve can be inserted through the center of the prestressing tendon reel to support the prestressing tendon reel. A force-bearing stop bar is detachably and horizontally erected on the front and rear sides of the support frame. The two ends of the force-bearing stop bar are respectively erected on the ends of the support beams on the left and right sides of the support frame. The conical protective frame is a hollow conical frame structure. The large end of the conical protective frame is fixedly installed on the right end of the support frame, and the small end of the conical protective frame is provided with a discharge through hole.
[0007] During material preparation and construction, the prestressed tendon reel with the sleeve is hoisted from the top opening of the support frame to between the two load-bearing bars, and a single prestressed tendon is pulled out from the discharge hole.
[0008] In one alternative, the horizontal distance between the front and rear top crossbeams of the support frame is greater than the diameter of the prestressing tendon reel, and the horizontal distance between the two load-bearing stops on the support frame is less than the diameter of the reinforcing sleeve.
[0009] In one alternative, the ground clearance of the supporting beams is such that when only the reinforcing sleeve is placed between the two supporting beams, the reinforcing sleeve does not contact the ground.
[0010] In one alternative, the support frame also includes fixing rods, with two fixing rods fixedly installed between the two columns at the right end of the support frame, and the large end of the tapered protective frame being fixedly connected to the fixing rods.
[0011] In one alternative embodiment, the conical protective frame includes several rings with successively decreasing diameters and several connecting rods. The rings are arranged coaxially at intervals, and the array of connecting rods is fixedly installed on the circumference of each ring, thereby forming a hollow conical frame structure. The ring at the large end of the conical protective frame is fixedly connected to the fixed rod, and the ring at the small end of the conical protective frame forms a discharge through hole.
[0012] In one alternative, when the unopened prestressed tendon coil is placed on the support frame via two force-bearing bars, the conical protective frame is coaxial with the prestressed tendon coil and the sleeve, and the diameter of the hole at the large end of the conical protective frame is larger than the diameter of the prestressed tendon coil.
[0013] In one alternative, the load-bearing stop is made of square tubing, and the columns and beams of the support frame are made of angle steel. The openings of the columns face inward, and the openings of the beams face upward, thus forming a platform that facilitates the installation of the load-bearing stop.
[0014] The beneficial effects of this utility model are:
[0015] This invention involves erecting force-bearing blocks on both the front and rear sides of a support frame. The prestressed tendon reel is then placed on the support frame above the ground via these two force-bearing blocks. A conical protective frame with a conical structure is installed on the support frame. The constraint of the prestressed tendon reel by the two force-bearing blocks and the constraint of the pulled-out prestressed tendon by the conical protective frame ensures that the prestressed tendon can be normally extracted during the material preparation process. This prevents the prestressed tendon from momentarily unloading and loosening, effectively avoiding dispersion or rebound shrinkage during material preparation. This eliminates the safety hazards caused by prestressed tendon dispersion or rebound shrinkage, which can easily lead to personnel injury. The invention is convenient to operate and use, ensures a stable supply of prestressed tendons, and helps guarantee the construction progress.
[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the overall structure of the protective device in one embodiment of this application;
[0019] Figure 2 This is a front view schematic diagram of the protective device in one embodiment of this application;
[0020] Figure 3 This is a right-side view of the protective device in one embodiment of this application;
[0021] Figure 4 This is a top view of a protective device in one embodiment of this application.
[0022] The following are the labels in the attached diagram: 1-support frame, 11-column, 12-top beam, 13-support beam, 14-fixing rod; 2-reinforcing sleeve; 3-force-bearing stop bar; 4-conical protective frame, 40-discharge hole, 41-ring, 42-connecting rod; 5-prestressed tendon coil. Detailed Implementation
[0023] The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application. Similarly, the following examples are only some embodiments of this application, not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0024] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0026] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0027] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0028] To address the aforementioned problems, this application proposes improvements and innovations, including the following embodiments.
[0029] In one implementation, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 This application provides a prestressed tendon cutting protection device, including a support frame 1, a tendon sleeve 2, a force-bearing stop bar 3, and a conical protective frame 4; the support frame 1 is a square frame structure, including four columns 11, a top crossbeam 12, and a support crossbeam 13. The top crossbeam 12 is fixedly installed between the upper ends of adjacent columns 11, and the support crossbeam 13 is horizontally fixedly installed between the lower parts of adjacent columns 11, and the support crossbeam 13 is set off from the ground; the tendon sleeve 2 can be inserted through the center of the prestressed tendon reel 5 to support the prestressed tendon reel 5. A load-bearing stop bar 3 is detachably and horizontally erected on the front and rear sides of the support frame 1. The two ends of the load-bearing stop bar 3 are respectively erected on the ends of the support beams 13 on the left and right sides of the support frame 1. The conical protective frame 4 is a hollow conical frame structure. The large end of the conical protective frame 4 is fixedly installed on the right end of the support frame 1, and the small end of the conical protective frame 4 is provided with a discharge hole 40. During material unloading, the prestressed tendon reel 5 with the sleeve 2 is hoisted from the top opening of the support frame 1 to the space between the two load-bearing stop bars 3, and a single prestressed tendon is pulled out from the discharge hole 40.
[0030] Specifically, during the material cutting process, according to the number of steel wires or strands required for the prestressing tendons as specified in the construction requirements, a corresponding number of protective devices are arranged. Each protective device is responsible for supplying material for one prestressing tendon. First, the sleeve cylinder 2 is inserted into the middle cavity of the unopened single bundle of prestressing tendon reel 5. Then, the prestressing tendon reel 5 with the sleeve cylinder 2 inserted is hoisted from the top opening of the support frame 1 between the two force-bearing bars 3, so that the prestressing tendon reel 5 is placed on the support frame 1 off the ground through the two force-bearing bars 3. Then, the prestressing tendon reel 5 is unsealed, and the single prestressing tendon is pulled out from the discharge hole 40 of the conical protective frame 4, so that the prestressing tendon can be smoothly unfolded and pulled out, thereby completing the subsequent material cutting and threading process.
[0031] In this embodiment, by erecting force-bearing bars 3 on the front and rear sides of the support frame 1, the prestressing tendon reel 5 is placed on the support frame 1 off the ground through the two force-bearing bars 3. The prestressing tendon reel 5 is placed horizontally on the two force-bearing bars 3 with its axis parallel to the force-bearing bars 3. Thus, the support frame 1 forms a longitudinal limit on the force-bearing bars 3, and the two force-bearing bars 3 form a longitudinal limit on the prestressing tendon reel 5, thereby creating a constraint effect on the prestressing tendon reel 5 that is difficult to loosen. By setting a conical protective frame 4 with a conical structure, the prestressing tendons supplied by the prestressing tendon reel 5 on the support frame 1 are pulled out from the discharge hole 40. On the one hand, it is convenient for the prestressing tendons to smoothly enter the conical protective frame 4 from the large end. On the other hand, the small end of the conical protective frame 4 can constrain the rebound shrinkage space of the prestressing tendons, thereby creating a constraint effect on the pulled-out prestressing tendons that is difficult to rebound shrinkage.
[0032] Thus, through the constraint of the two force-bearing rods 3 on the prestressing tendon reel 5 and the constraint of the conical protective frame 4 on the pulled-out prestressing tendons, it can be ensured that the prestressing tendons can be normally extracted during the material cutting process, while avoiding the phenomenon of instantaneous unloading and loosening of the prestressing tendons. This effectively avoids the dispersion or rebound shrinkage of the prestressing tendons during the material cutting process, eliminating the safety hazards that the dispersion or rebound shrinkage of prestressing tendons can easily cause personnel injury. The operation is convenient and easy to use, and the supply of prestressing tendons is stable, which is conducive to ensuring the construction progress.
[0033] In some embodiments, the horizontal distance between the front and rear top crossbeams 12 of the support frame 1 is greater than the diameter of the prestressing tendon reel 5, and the horizontal distance between the two force-bearing stops 3 on the support frame 1 is less than the diameter of the sleeve 2. This ensures that the prestressing tendon reel 5 can smoothly enter from the top opening of the support frame 1, and that the prestressing tendon reel 5 can be stably placed between the two force-bearing stops 3. The ground clearance of the support crossbeams 13 is such that when only the sleeve 2 is placed between the two support crossbeams 13, the sleeve 2 does not contact the ground. This ensures that while the two force-bearing stops 3 stably support the prestressing tendon reel 5, when only the last layer of prestressing tendons remains on the sleeve 2, the sleeve 2 and the prestressing tendons do not contact the ground, thus preventing the prestressing tendons from being contaminated by soil.
[0034] In some embodiments, the support frame 1 further includes fixing rods 14. Two fixing rods 14 are fixedly installed between the two columns 11 at the right end of the support frame 1, and the large end of the conical protective frame 4 is fixedly connected to the fixing rods 14. In this way, by installing the conical protective frame 4 through the fixing rods 14, the installation position of the conical protective frame 4 can be matched with the placement position of the prestressed tendon reel 5, while avoiding material waste caused by directly installing the conical protective frame 4 on the support frame 1.
[0035] In some embodiments, the conical protective frame 4 includes a plurality of rings 41 with successively decreasing diameters and a plurality of connecting rods 42. The rings 41 are arranged coaxially at intervals, and the connecting rods 42 are arrayed and fixedly installed on the circumference of each ring 41, thereby forming a hollow conical frame structure. The ring 41 at the large end of the conical protective frame 4 is fixedly connected to the fixing rod 14, and the ring 41 at the small end of the conical protective frame 4 forms a discharge through hole 40. In this way, the conical protective frame 4 has an overall conical frame structure, which allows the pulled-out prestressing tendons to be in a spiral state that matches the conical structure of the conical protective frame 4. This provides a transition space for the pulled-out prestressing tendons within the cavity of the conical protective frame 4. In addition, the discharge through hole 40 is formed by the ring 41 at the small end of the conical protective frame 4. The discharge through hole 40 is a round hole, which allows the prestressing tendons pulled out from the discharge through hole 40 to make smooth contact with the ring 41. This allows the discharge through hole 40 to exert a constraint effect on the pulled-out prestressing tendons that makes it difficult for them to spring back and shrink, while also facilitating the smooth pulling out of the prestressing tendons from the discharge through hole 40.
[0036] In some embodiments, when the unopened prestressing tendon reel 5 is placed on the support frame 1 via two force-bearing bars 3, the conical protective frame 4 is coaxial with the prestressing tendon reel 5 and the sleeve 2, and the diameter of the hole at the large end of the conical protective frame 4 is larger than the diameter of the prestressing tendon reel 5. This effectively improves the matching degree between the installation position of the conical protective frame 4 and the placement position of the prestressing tendon reel 5, so that when the prestressing tendon reel 5 is first unsealed, the ring 41 at the large end of the conical protective frame 4 will not obstruct the prestressing tendon, thereby ensuring that the prestressing tendon can smoothly enter the interior of the conical protective frame 4 from the large end for subsequent material cutting operations.
[0037] In some embodiments, the load-bearing stop bar 3 is a square tube, and the columns 11 and supporting beams 13 of the support frame 1 are angle steel. The openings of the columns 11 face inward, and the openings of the supporting beams 13 face upward, thus forming a placement platform that facilitates the installation of the load-bearing stop bar 3. In this way, the lower flange of the angle steel serving as the supporting beam 13 forms the placement platform. At the same time, the front and rear flanges of the columns 11 and the supporting beams 13 located on the front and rear sides of the support frame 1 provide longitudinal restraint for the two load-bearing stop bars 3, and the left and right flanges of the columns 11 and the supporting beams 13 located on the left and right ends of the support frame 1 provide lateral restraint for the two load-bearing stop bars 3. This effectively improves the installation stability of the load-bearing stop bar 3 on the support frame 1, thereby ensuring the placement stability of the prestressed tendon coil 5. In addition, the load-bearing stop bar 3 is detachable from the support frame 1, which facilitates the disassembly and transportation of this protective device after use, saving time and effort. In specific applications, the top crossbeam 12 and the fixing rod 14 are also made of angle steel to facilitate the use of the same material for the support frame 1, thereby making the manufacturing and assembly of the support frame 1 easier.
[0038] Finally, it should be noted that although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention, all of which should be included within the protection scope of this application.
Claims
1. A protective device for prestressed tendon cutting, characterized in that: It includes a support frame (1), a sleeve cylinder (2), a force-bearing stop bar (3), and a conical protective frame (4); the support frame (1) is a square frame structure, the support frame (1) includes four columns (11) and a top crossbeam (12) and a support crossbeam (13), the top crossbeam (12) is fixedly installed between the upper ends of adjacent columns (11), the support crossbeam (13) is horizontally fixedly installed between the lower parts of adjacent columns (11), and the support crossbeam (13) is set off from the ground; The sleeve cylinder (2) can be inserted through the center of the prestressed tendon reel (5) to support the prestressed tendon reel (5). The front and rear sides of the support frame (1) are respectively detachably horizontally provided with a force-bearing rod (3). The two ends of the force-bearing rod (3) are respectively provided at the ends of the support beams (13) on the left and right sides of the support frame (1). The conical protective frame (4) is a hollow conical frame structure. The large end of the conical protective frame (4) is fixedly installed on the right end of the support frame (1). The small end of the conical protective frame (4) is provided with a discharge through hole (40). During material preparation and construction, the prestressed tendon reel (5) with the sleeve (2) is hoisted from the top opening of the support frame (1) to the space between the two force-bearing bars (3), and a single prestressed tendon is pulled out from the discharge hole (40).
2. The prestressed tendon cutting protection device according to claim 1, characterized in that: The horizontal distance between the front and rear top crossbeams (12) of the support frame (1) is greater than the diameter of the prestressed tendon reel (5), and the horizontal distance between the two force-bearing bars (3) on the support frame (1) is less than the diameter of the sleeve cylinder (2).
3. The prestressed tendon cutting protection device according to claim 1 or 2, characterized in that: The ground clearance of the supporting beam (13) is such that when only the reinforcing sleeve (2) is placed between the two supporting beams (13), the reinforcing sleeve (2) does not contact the ground.
4. The prestressed tendon cutting protection device according to claim 1, characterized in that: The support frame (1) also includes a fixing rod (14). Two fixing rods (14) are fixedly installed between two columns (11) at the right end of the support frame (1). The large end of the conical protective frame (4) is fixedly connected to the fixing rod (14).
5. The prestressed tendon cutting protection device according to claim 4, characterized in that: The conical protective frame (4) includes several rings (41) with successively decreasing diameters and several connecting rods (42). The rings (41) are arranged coaxially at intervals, and the connecting rods (42) are arrayed and fixedly installed on the circumference of each ring (41) to form a hollow conical frame structure. The ring (41) at the large end of the conical protective frame (4) is fixedly connected to the fixed rod (14), and the ring (41) at the small end of the conical protective frame (4) forms a discharge through hole (40).
6. The prestressed tendon cutting protection device according to claim 4, characterized in that: When the unopened prestressed tendon coil (5) is placed on the support frame (1) through two force-bearing bars (3), the conical protective frame (4) is coaxial with the prestressed tendon coil (5) and the sleeve cylinder (2), and the diameter of the hole at the large end of the conical protective frame (4) is larger than the diameter of the prestressed tendon coil (5).
7. The prestressed tendon cutting protection device according to claim 1, characterized in that: The force-bearing stop bar (3) is a square tube, and the column (11) and the support beam (13) of the support frame (1) are angle steel. The opening of the column (11) is set inward, and the opening of the support beam (13) is set upward, thereby forming a placement platform that facilitates the installation of the force-bearing stop bar (3).