Clamping system for external prestressing two-end tensioning

Abstract

The invention discloses a clamping system for external prestressing two-end tensioning. The clamping system comprises a clamping part, a connecting part and a binding part. The clamping part comprises a first clamping piece and a second clamping piece; the first clamping piece and the second clamping piece are respectively clamped on two opposite outer surfaces of the structure and are fastened through a screw rod; the number of the clamping parts is two, and a steel fiber bundle is clamped by the clamping parts. The two ends of the connecting part are fixed to the two opposite ends of the two first clamping pieces correspondingly so that the two first clamping pieces can be connected into the clamping system. The binding part is annularly arranged at the end of the clamping part in a sleeving mode so as to change the tensioning inclination angle of the steel fiber bundle. The binding part can apply a pre-tightening force to the clamping part, so that a steel fiber bundle warps upwards by a certain angle, the tensioning equipment is arranged at one ends of the two connecting parts, and meanwhile, the steel fiber bundle is tensioned, so that external pre-stress can be applied to a structure in a multi-angle and multi-layer composite manner; and it can be ensured that external prestress is applied more perfectly through different force application stages.

Description

Technical Field

[0001] The invention relates to the technical field of external prestressing reinforcement equipment, and more particularly to a clamping system for tensioning both ends of external prestressing. Background Art

[0002] External prestressing is one of the important branches of post-tensioned prestressed structural system. It is a kind of prestressing that arranges the prestressing lock outside the concrete section.

[0003] Prestressed concrete clamps are devices used to apply and maintain prestress in concrete members. Prestressed concrete technology is a method of introducing stress (usually tensile stress) into concrete in advance to increase its bearing capacity and durability. This technology is widely used in the construction of bridges, floors, beams, reservoirs and other structures. Prestressing can be achieved by tensioning steel bars, strands or other reinforcing materials, and prestressed concrete clamps play a key role in this process.

[0004] The type and specific design of concrete prestressing clamps may vary depending on the specific needs of the application, including the type of reinforcement material used, the amount of prestressing force, and the shape and size of the member. Proper selection and use of prestressing clamps is critical to ensuring the performance and safety of the structure.

[0005] Although traditional prestressed clamps have been widely used in the field of concrete construction, they have significant limitations in many aspects, which not only affect the performance and economy of the construction, but also may reduce the efficiency of the construction process. First, the operation process of these clamps is usually very complicated, and it is necessary to rely on experienced technicians to complete the tensioning and anchoring work, which not only increases the labor cost of the project, but also makes the construction period have to be extended. Secondly, traditional clamps are prone to wear and damage after long-term use, and require frequent maintenance and replacement of parts, which undoubtedly increases the long-term cost of the project.

[0006] In addition, the design of traditional prestressed clamps may be too limited in some cases and cannot adapt to all types of prestressed concrete structures, especially those with complex or non-standard shapes, which often require customized solutions. This not only increases costs, but may also extend the implementation time of the project. At the same time, these clamps are usually heavy and bulky, which not only increases transportation costs but also brings difficulties to on-site operations. Another key issue is stress concentration, which may cause local damage to concrete members or reinforcement materials, thereby reducing the overall performance of the structure.

[0007] As construction technology advances and design requirements change, the adaptability of traditional prestressed clamps becomes more apparent. They may not be able to meet new engineering needs, especially in projects involving high-performance concrete and complex structural designs.

[0008] Therefore, how to provide a multifunctional clamping system that can be used for composite loading and tensioning of both ends of in vitro prestressing, which can apply prestress in a multi-level composite manner at multiple angles, with different methods and different force application stages, and prevent imperfect stress application due to external factors during the process of applying prestress, is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0009] In view of this, the present invention provides a clamping system for tensioning both ends of external prestressing, aiming to solve the above technical problems.

[0010] In order to achieve the above object, the present invention adopts the following technical solution:

[0011] A clamping system for tensioning both ends of an external prestressed material, comprising a clamping part, a connecting part and a binding part;

[0012] The clamping part comprises a first clamping member and a second clamping member, wherein the first clamping member and the second clamping member are respectively clamped on two opposite outer surfaces of the structure and fastened by screws; wherein the clamping part is provided with two first clamping members and the two first clamping members clamp the steel fiber bundle;

[0013] The two ends of the connecting portion are respectively fixed to the two opposite ends of the two first clamping members to connect them into a clamping system;

[0014] The binding part is in the form of a ring and is sleeved on the end of the clamping part to change the tensioning inclination angle of the steel fiber bundle.

[0015] The beneficial effect of the above technical solution is that the two clamping parts are connected by a connecting part, and the two clamping parts clamp the externally prestressed steel fiber bundle. The binding part is arranged at one end of the clamping part, and a pre-tightening force can be applied to the clamping part. When the binding part applies force, the steel fiber bundle at the tensioning end will rise by a certain angle. By adjusting the tightness of the binding part, the supporting force on the steel fiber bundle can be adjusted to change the inclination angle of the steel fiber bundle. The tensioning equipment is arranged at one end of the two connecting parts away from the binding part to tension the steel fiber bundle at the same time, which can apply multi-angle and multi-level composite loading of external prestress to the structure, and ensure that the application of external prestress is more perfect through different force application stages.

[0016] Preferably, the first clamping member includes a bearing plate and a cover plate, and the two opposite ends of the top surface of the bearing plate are fixed with restrainers for passing the steel fiber bundle, and the bearing plate is fixed with a sawtooth block on the top surface between the two restrainers, and the cover plate covers the top surface of the bearing plate. The steel fiber bundle passes through the bearing plate and the cover plate through the two restrainers, and the design of the sawtooth block can improve the restraining force and friction force of the first clamping member on the steel fiber bundle.

[0017] Preferably, it further comprises a pressing plate, the bottom surface of which is provided with a sawtooth groove adapted to the sawtooth block, the pressing plate is buckled with the sawtooth block and is embedded between the cover plate and the bearing plate; the cover plate, the pressing plate and the bearing plate are locked by fastening bolts. The steel fiber bundle is pressed by the pressing plate and the sawtooth block, and the pressing plate and the sawtooth block serve as a buffer area for the steel fiber bundle to prevent the steel fiber bundle from being broken.

[0018] Preferably, the clamping portion further includes a support plate and a jack;

[0019] The second clamping member includes a clamping plate and a guide rail, wherein the clamping plate is arranged in parallel below the bearing plate and is slidably connected to the rod wall of the screw rod; the guide rail is multiple and vertically fixed to one side of the bottom surface of the clamping plate in an array;

[0020] The support plate is arranged parallel to the clamping plate and is slidably connected to the guide rail; the two ends of the jack are respectively supported between the two opposite plate surfaces of the support plate and the clamping plate;

[0021] The binding part is sleeved around the peripheral sides of the support plate, the clamping plate and the cover plate to limit the sliding of the support plate.

[0022] The beneficial effect of the above technical solution is that when the clamping part is installed, for situations where the structure is complex or the operating space is limited, the clamping plate can be pushed against the surface of the structure by a jack, and then the screw and the clamping plate can be fastened by a nut. After the fastening is completed, the jack can be removed to complete the installation of the clamping part.

[0023] Preferably, the binding part includes a sling and a fixing part, the sling is connected end to end to form a ring and is fastened by the fixing part; the ring-shaped sling is sleeved on the outer periphery of the clamping part and the structure to provide a holding force to change the inclination angle of the steel fiber bundle. Since the binding part is arranged at one end of the clamping part, when the binding part is tightened, it can provide a holding force to the clamping part. After the end of the clamping part is stressed, the steel fiber bundle at the other end will be tilted to a certain angle as a tensioning end under the action of the clamping force. The tilting angle of the steel fiber bundle can be adjusted by adjusting the tightness of the binding part, and the multi-angle and multi-level graded application of external prestressing can be achieved by changing the inclination angle.

[0024] Preferably, a sling limiting ring is fixed at both ends of the top surface of the cover plate, a sling limiting groove is provided on the bottom surface of the support plate, the top end of the sling is inserted into the sling limiting ring, and the bottom end is tied in the sling limiting groove to limit the displacement of the sling. Through the action of the sling limiting ring and the sling limiting groove, the sling can be clamped at the end of the clamping part to prevent the sling from slipping off the clamping part due to the tension of the steel fiber bundle during the tensioning operation after the clamping part is tightened.

[0025] Preferably, an annular boss is fixed on the top surface of the support plate, an annular groove is formed on the bottom surface of the clamping plate corresponding to the annular boss, the fixed end of the jack is embedded in the groove cavity of the annular groove, and the lifting end penetrates into the annular cavity of the annular boss and abuts against the top surface of the support plate. The annular boss and the annular groove can limit the freedom of the jack, ensuring that the axis of the jack is always perpendicular to the clamping plate during operation, and preventing the clamping part from being unable to be completely clamped on both sides of the structure due to eccentric force.

[0026] Preferably, the connecting portion comprises a connecting rod; a connecting tenon block is fixed to the end of the first clamping member close to the binding portion;

[0027] A first tenon block is fixed at the end of the connecting rod, and a first tenon groove adapted to the first tenon block is formed at the end of the connecting rod corresponding to the first tenon block;

[0028] There are multiple connecting rods, and the first tenon blocks at two opposite ends of the multiple connecting rods are inserted into the first tenon grooves and fastened by bolts;

[0029] The connecting tenon block is inserted into the first tenon groove of the connecting rod adjacent thereto, and the connecting tenon block is fastened to the first tenon block corresponding thereto by bolts.

[0030] The beneficial effect of the above technical solution is that, according to the tensioning needs and the size of the structure, connecting rods of different lengths and different numbers are selected for connection to meet the tensioning operation requirements.

[0031] Preferably, it further comprises a steering rod; the steering rod is arranged between two adjacent connecting rods, the steering rod comprises a first steering rod and a second steering rod, the first ends of the first steering rod and the second steering rod are both fixed with a second tenon block, and the ends corresponding to the second tenon block are provided with a second tenon groove adapted to the first tenon block; the second ends of the first steering rod and the second steering rod are hinged;

[0032] The second tenon blocks of the first steering rod and the second steering rod are inserted into the first tenon grooves of the connecting rods adjacent thereto, and the corresponding first tenon blocks are inserted into the second tenon grooves and fastened by bolts.

[0033] The beneficial effect of the above technical solution is that the steering rod can make the connecting rod have a certain inclination angle, adapt to structures with complex shapes, avoid secondary damage to the structure, and be more flexible and varied in use.

[0034] Preferably, it also includes a rotating shaft, and the connecting parts are provided with two and symmetrically arranged, and the rotating shaft passes through the second ends of the first steering rod and the second steering rod so that the first steering rod and the second steering rod can rotate relative to each other around the rotating shaft. Through the two connecting parts, the connection between the two clamping parts can be made more reliable, ensuring the effective tensioning operation; the number of connections between the connecting rod and the steering rod can be freely determined according to the length, structural form and effective length of the applied prestress of the specific components. Put the steel fiber bundle into the restraint and fix the bearing plate and the cover plate by bolts, so that the steel fiber bundle can be completely fixed.

[0035] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a clamping system for tensioning both ends of external prestressing. Before applying external prestressing to actual engineering components and laboratory test beams, plates and other structural components, the clamping system of the present invention can be disassembled and placed in a clamp storage box for easy carrying and storage; its detachable and assembling design features provide greater flexibility and convenience for construction and testing. At the same time, the reasonable structural design of the clamping part ensures the stability and safety of the component during the application of prestress, thereby ensuring the smooth progress of construction and testing.

[0036] In traditional concrete prestressed fixtures, dangerous situations often occur due to problems with the loading method. The patented invention adopts a semi-mechanized form of loading, which significantly improves safety and reliability.

[0037] In traditional concrete prestressing fixtures, the prestress is often difficult to control and not intuitive. The present invention uses trigonometric functions and the elastic modulus of the steel fiber bundle to calculate the prestress, making the specific prestress value applied more controllable; the graded loading system makes the loading method more intuitive and flexible. In the actual loading process, the loading order of the prestress can be determined according to the needs of different structural components.

[0038] In summary, the features of the present invention provide more options and conveniences for engineering construction and experiments, and can meet the usage requirements in different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0040] Figure 1 A schematic diagram of the structure of the clamping system provided by the present invention;

[0041] Figure 2 A schematic diagram of the structure of the clamping portion provided by the present invention;

[0042] Figure 3 An exploded schematic diagram of the clamping portion provided by the present invention;

[0043] Figure 4 A schematic diagram of the structure of the load-bearing plate provided by the present invention;

[0044] Figure 5 A schematic diagram of the support plate structure provided by the present invention;

[0045] Figure 6 A schematic diagram of the structure of the binding part fixing member provided by the present invention;

[0046] Figure 7 A schematic diagram of the connecting rod structure provided by the present invention;

[0047] Figure 8 This is a schematic diagram of the steering rod structure provided by the present invention.

[0048] in,

[0049] 100-clamping part; 110-first clamping member; 1101-cover plate; 1102-carrying plate; 1103-sling limiting ring; 1104-serrated block; 1105-constraint; 120-second clamping member; 1201-clamping plate; 1202-guide rail; 130-screw rod; 140-jack; 150-support plate; 1501-annular boss; 1502-sling limiting groove; 160-pressing plate;

[0050] 200-connecting part; 210-connecting rod; 2101-first tenon block; 2102-first tenon groove; 220-steering rod; 2201-second tenon block; 2202-second tenon groove; 2203-first steering rod; 2204-second steering rod; 230-rotating axis;

[0051] 300-binding part; 310-sling; 320-fixing piece; 3201-constraint hole; 3202-pressure column; 3203-rivet;

[0052] 400-Joint tenon block. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 creative work are within the scope of protection of the present invention.

[0054] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0055] In the description of the present invention, “plurality” means two or more than two, unless otherwise clearly and specifically defined.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a welding connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0058] See attached Figures 1 to 8 , the embodiment of the present invention discloses a clamping system for tensioning both ends of an in vitro prestressed structure, comprising a clamping portion 100, a connecting portion 200 and a binding portion 300;

[0059] The clamping part 100 includes a first clamping member 110 and a second clamping member 120, which are respectively clamped on two opposite outer surfaces of the structure and fastened by a screw 130; wherein the clamping part 100 is provided with two first clamping members 110 and the two first clamping members 110 clamp the steel fiber bundle;

[0060] The two ends of the connecting portion 200 are respectively fixed to the two opposite ends of the two first clamping members 110 to connect them into a clamping system;

[0061] The binding part 300 is in a ring shape and is sleeved on the end of the clamping part 100 to change the tensioning angle of the steel fiber bundle.

[0062] In this embodiment, if Figure 4 As shown, the first clamping member 110 includes a supporting plate 1102 and a cover plate 1101, and the two opposite ends of the top surface of the supporting plate 1102 are fixed with restraints 1105 for passing the steel fiber bundle, and the top surface of the supporting plate 1102 between the two restraints 1105 is fixed with a sawtooth block 1104, and the cover plate 1101 covers the top surface of the supporting plate 1102.

[0063] When using, Figure 1 As shown, the steel fiber bundle passes through the restraints on the two first clamping members, and the load-bearing plate is covered by a cover plate and fastened with bolts. Under the action of the sawtooth block, the cover plate presses and fixes the steel fiber bundle on the first clamping member, and the tensioning equipment clamps the steel fiber bundle at the opposite ends of the two clamping parts for in vitro prestressing.

[0064] In some other specific embodiments, according to reinforcement requirements, the steel fiber bundles can be replaced by steel strands, steel bars, or prestressed anchor cables.

[0065] In order to further optimize the above technical solution, improve the restraining force and friction force of the steel fiber bundle, and prevent the steel fiber bundle from being broken, it also includes a pressing plate 160, and the bottom surface of the pressing plate 160 is provided with a serrated groove adapted to the serrated block 1104. The pressing plate 160 engages with the serrated block 1104 and is embedded between the cover plate 1101 and the supporting plate 1102; the cover plate 1101, the pressing plate 160 and the supporting plate 1102 are locked by fastening bolts.

[0066] In this embodiment, the clamping portion 100 further includes a support plate 150 and a jack 140;

[0067] The second clamping member 120 includes a clamping plate 1201 and a guide rail 1202. The clamping plate 1201 is arranged parallel to the lower side of the bearing plate 1102 and is slidably connected to the rod wall of the screw rod 130. The guide rail 1202 is multiple and is vertically fixed to one side of the bottom surface of the clamping plate 1201 in an array.

[0068] The support plate 150 is arranged parallel to the clamping plate 1201 and is slidably connected to the guide rail 1202; the two ends of the jack 140 are respectively supported between the two opposite plate surfaces of the support plate 150 and the clamping plate 1201;

[0069] The binding part 300 is sleeved around the supporting plate 150 , the clamping plate 1201 and the cover plate 1101 to limit the sliding of the supporting plate 150 .

[0070] like Figure 2 and 3 As shown, the screw is arranged perpendicular to the cover plate, an anchor hole is opened on the structure, the screw passes through the cover plate, the anchor hole of the structure and the clamp plate from top to bottom, and is fastened by nuts so that the bearing plate and the clamp plate are clamped on the two side surfaces of the structure; the fastening bolts pass through the bearing plate and the cover plate from bottom to top, lock the bearing plate and the cover plate, and the pressure plate is embedded between the cover plate and the bearing plate and buckles the serrated block.

[0071] The binding part is sleeved on the outer peripheral side of the clamping part to tie the support plate to the bottom of the splint. The binding part can limit the sliding of the support plate along the guide rail by tying it. The jack is supported between the support plate and the splint. When the jack is lifted, the binding part is pulled closer to provide clamping force, so that the splint can be fitted with the outer surface of the structure. The splint can be fixed by locking the nut and the screw to complete the installation operation of the first clamping part and the second clamping part clamping the structure. At the same time, since the binding part applies the clamping force at the end of the clamping part, when the end is subjected to force, the other end serves as the tensioning end. The steel fiber bundle at the tensioning end will be tilted at a certain angle under the action of the binding part. The lifting height of the jack is adjusted to adjust the tightness of the binding part, thereby changing the tilting angle of the steel fiber bundle at the tensioning end, thereby applying in vitro prestress at multiple angles. By using trigonometric functions and the elastic modulus of steel fiber bundles to calculate prestress, in the actual loading process, the loading sequence of prestress can be determined according to the needs of different structural components to carry out graded loading, thereby achieving multi-level composite loading of in vitro prestress at multiple angles, different methods, and different force application stages.

[0072] In order to further optimize the above technical solution, auxiliary threaded holes are provided on the panel of the splint, and auxiliary fixing bolts penetrate the auxiliary threaded holes from bottom to top and abut against the structure; when the nut and the screw are not sufficient to fasten the splint to the structure or when a gap is found between the splint, the load-bearing plate and the surface of the structure during the tensioning process, and the clamping part is loose, the auxiliary threaded holes are activated and the splint and the structure are further fastened by the auxiliary fixing bolts.

[0073] In order to further optimize the above technical solution, when the steel fiber bundle still cannot be tightened or slides after the cover plate and the bearing plate are tightened by fastening bolts, a pre-tightening threaded hole is opened on the pressure plate. The pre-tightening thread passes through the pre-tightening threaded holes of the bearing plate and the pressure plate from bottom to top and abuts against the inner wall of the cover plate. The bearing plate, the pressure plate and the cover plate are further locked by the pre-tightening bolts to provide clamping force to clamp the steel fiber bundle.

[0074] In order to further optimize the above technical solution, the binding part 300 includes a sling 310 and a fixing part 320. The sling 310 is connected end to end to form a ring and is fastened by the fixing part 320. The ring-shaped sling 310 is sleeved on the outer periphery of the clamping part 100 and the structure to provide a supporting force to change the inclination angle of the steel fiber bundle.

[0075] like Figure 2 , 3 As shown in FIG. 6 , a plurality of restraint holes 3201 are provided at one end of the fixing member 320, and a plurality of parallel pressure columns 3202 are fixed at the other end. One end of the binding band 310 is sequentially wound around the plurality of pressure columns 3202 and fastened by rivets 3203, and the other end is fastened to the restraint hole 3201 by restraint bolts.

[0076] The fixing part 320 is arranged on the top surface of the cover plate 1101, and one end of the sling 310 is fastened to the fixing part 320 by a restraining bolt, and the other end is sequentially surrounded by the cover plate 1101, the bearing plate 1102, the clamping plate 1201 and the support plate 150 to form a ring and is sleeved on the end of the combined structure, and the end is sequentially wrapped around multiple pressure columns 3202 and fastened to the pressure columns 3202 by rivets 3203 to complete the installation of the strap.

[0077] In order to further optimize the above technical solution, a plurality of triangular bolt holes are provided on the sling, and a protective copper ring is fixed in each bolt hole. The appropriate bolt holes and the constraint holes of the fixing parts are selected according to the size of the structure for fixing. The triangular bolt holes can make the sling more evenly stressed under the action of left and right tension, and can increase the lateral tensile resistance.

[0078] As shown in the figure, in this embodiment, there are three pressure columns, the one close to the constraint hole is the first pressure column, the middle one is the second pressure column, and the outer one is the third pressure column. One end of the sling is fixed in reverse direction between the second pressure column, the first pressure column and the third pressure column, and the sling and the first pressure column are fastened by rivets. Under the action of external force, it can not only protect the copper ring from stress, but also act downward under the action of the three pressure columns to cause friction stress. This not only increases the service life of the sling, but also makes the sling fixation more stable.

[0079] In order to further optimize the above technical solution and prevent the annular sling from slipping off the clamping part due to the tightening of the annular sling after the jack is lifted, sling limiting rings 1103 are fixed at both ends of the top surface of the cover plate 1101, and a sling limiting groove 1502 is opened on the bottom surface of the support plate 150. The top end of the sling 310 is inserted into the sling limiting ring 1103, and the bottom end is tied in the sling limiting groove 1502 to limit the displacement of the sling 310.

[0080] In order to further optimize the above technical solution, an annular boss 1501 is fixed on the top surface of the support plate 150, and an annular groove is opened on the bottom surface of the clamping plate 1201 corresponding to the annular boss 1501. The fixed end of the jack 140 is embedded in the groove cavity of the annular groove, and the lifting end penetrates into the annular cavity of the annular boss 1501 and abuts against the top surface of the support plate 150.

[0081] like Figure 5 As shown, the annular boss on the top surface of the support plate and the annular groove on the bottom surface of the clamping plate can make the axis of the jack always perpendicular to the panel of the clamping plate, which ensures the freedom of the jack and ensures that it will not deviate when the lifting force acts on the binding part, ensuring the effective provision of the clamping force of the binding part. The limiting groove on the bottom surface of the support plate and the sling limiting ring on the top surface of the cover plate can clamp the sling at the end of the clamping part, limiting the displacement of the annular sling.

[0082] In order to further optimize the above technical solution, the connecting portion 200 includes a connecting rod 210; a connecting tenon block 400 is fixed to the end of the first clamping member 110 close to the binding portion 300;

[0083] A first tenon block 2101 is fixed to the end of the connecting rod 210, and a first tenon groove 2102 adapted to the first tenon block 2101 is formed at the end of the connecting rod 210 corresponding to the first tenon block 2101;

[0084] There are multiple connecting rods 210, and the first tenon blocks 2101 at two opposite ends of the multiple connecting rods 210 are inserted into the first tenon grooves 2102 and fastened by bolts;

[0085] The connecting tenon block 400 is inserted into the first tenon groove 2102 of the connecting rod 210 adjacent thereto, and the connecting tenon block 400 is fastened to the corresponding first tenon block 2101 by bolts.

[0086] like Figure 1 and 7 As shown, the ends of the connecting rod are plugged into each other, and the connecting tenon block at the end of the first clamping member is plugged into the connecting rod. The plug-in joints are fastened with bolts. By utilizing the mortise and tenon structure, connecting rods of different numbers and lengths can be selected according to the tensioning needs, making the use of the clamping system more flexible.

[0087] In order to further optimize the above technical solution, anchor holes corresponding to the structure are opened on the outer wall of the connecting rod. The anchor bolts penetrate the connecting rod and the structure from top to bottom to lock the connecting rod and the structure. At the same time, the connecting rod and the clamping part are locked by bolts. This can ensure that the connecting rod, structure and clamping part are an integral structure. The clamping system will not shift during the tensioning process, ensuring the perfection and effectiveness of the application of extracorporeal prestress.

[0088] In order to further optimize the above technical solution so that the clamping system can adapt to structures of different shapes, it also includes a steering rod 220; the steering rod 220 is arranged between two adjacent connecting rods 210, and the steering rod 220 includes a first steering rod 2203 and a second steering rod 2204, and the first ends of the first steering rod 2203 and the second steering rod 2204 are both fixed with a second tenon block 2201, and the end corresponding to the second tenon block 2201 is provided with a second tenon groove 2202 adapted to the first tenon block 2101; the first steering rod 2203 is hinged to the second end of the second steering rod 2204;

[0089] The second tenon blocks 2201 of the first steering rod 2203 and the second steering rod 2204 are inserted into the first tenon grooves 2102 of the connecting rod 210 adjacent thereto, and the corresponding first tenon blocks 2101 are inserted into the second tenon grooves 2202 and fastened by bolts.

[0090] like Figure 1 and 8 As shown, the first steering rod and the second steering rod of the steering rod are hinged by a pin shaft, and the first steering rod and the second steering rod can rotate relative to each other. According to the cross-sectional shape of the structure, a suitable position is selected to install the steering rod, so that the clamping system adapts to the shape of the structure, further improving the flexibility of the use of the clamping system.

[0091] In some other specific embodiments, a rotating shaft 230 is further included. The connecting portion 200 is provided with two rotating shafts 230 and arranged symmetrically. The rotating shaft 230 passes through the second ends of the first steering rod 2203 and the second steering rod 2204 so that the first steering rod 2203 and the second steering rod 2204 can rotate relative to each other around the rotating shaft 230 .

[0092] By providing two clamping parts, the stability of the clamping part can be further improved, ensuring that the clamping part can effectively clamp the structure, while ensuring the stability of the clamping part during the tensioning process.

[0093] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0094] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A clamping system for tensioning both ends of an external prestressed load, characterized in that: It comprises a clamping portion (100), a connecting portion (200) and a binding portion (300); The clamping part (100) comprises a first clamping member (110) and a second clamping member (120), wherein the first clamping member (110) and the second clamping member (120) are respectively clamped on two opposite outer surfaces of the structure and fastened by a screw (130); wherein the clamping part (100) is provided with two first clamping members (110) for clamping the steel fiber bundle; The two ends of the connecting portion (200) are respectively fixed to the two opposite ends of the two first clamping members (110) to connect them into a clamping system; The binding portion (300) is in the form of a ring and is sleeved on the end of the clamping portion (100) to change the tensioning inclination angle of the steel fiber bundle.

2. A clamping system for tensioning both ends of external prestressing according to claim 1, characterized in that: The first clamping member (110) comprises a bearing plate (1102) and a cover plate (1101), and the two opposite ends of the top surface of the bearing plate (1102) are fixed with restrainers (1105) for passing the steel fiber bundle, and the top surface of the bearing plate (1102) between the two restrainers (1105) is fixed with a sawtooth block (1104), and the cover plate (1101) covers the top surface of the bearing plate (1102).

3. A clamping system for tensioning both ends of external prestressing according to claim 2, characterized in that: It also includes a pressing plate (160), the bottom surface of which is provided with a sawtooth groove adapted to the sawtooth block (1104); the pressing plate (160) is buckled with the sawtooth block (1104) and is embedded between the cover plate (1101) and the bearing plate (1102); the cover plate (1101), the pressing plate (160) and the bearing plate (1102) are locked by fastening bolts.

4. A clamping system for tensioning both ends of external prestressing according to claim 2, characterized in that: The clamping portion (100) further comprises a support plate (150) and a jack (140); The second clamping member (120) comprises a clamping plate (1201) and a guide rail (1202); the clamping plate (1201) is arranged in parallel below the bearing plate (1102) and is slidably connected to the rod wall of the screw rod (130); the guide rail (1202) is a plurality of guide rails (1202) vertically fixed in an array on one side of the bottom surface of the clamping plate (1201); The support plate (150) is arranged parallel to the clamping plate (1201) and is slidably connected to the guide rail (1202); the two ends of the jack (140) are respectively supported between the two opposite plate surfaces of the support plate (150) and the clamping plate (1201); The binding portion (300) is sleeved around the peripheral sides of the support plate (150), the clamping plate (1201) and the cover plate (1101) to limit the sliding of the support plate (150).

5. A clamping system for tensioning both ends of external prestressing according to claim 4, characterized in that: The binding portion (300) comprises a sling (310) and a fixing member (320), wherein the sling (310) is connected end to end to form a ring and is fastened by the fixing member (320); the ring-shaped sling (310) is sleeved on the outer periphery of the clamping portion (100) and the structure to provide a supporting force to change the inclination angle of the steel fiber bundle.

6. A clamping system for tensioning both ends of external prestressing according to claim 5, characterized in that: Suspender limiting rings (1103) are fixed at both ends of the top surface of the cover plate (1101), and a sling limiting groove (1502) is provided on the bottom surface of the support plate (150). The top end of the sling (310) is inserted into the sling limiting ring (1103), and the bottom end is tied in the sling limiting groove (1502) to limit the displacement of the sling (310).

7. A clamping system for tensioning both ends of external prestressing according to claim 4, characterized in that: An annular boss (1501) is fixed on the top surface of the support plate (150), and an annular groove is formed on the bottom surface of the clamping plate (1201) corresponding to the annular boss (1501). The fixed end of the jack (140) is embedded in the groove cavity of the annular groove, and the lifting end penetrates into the annular cavity of the annular boss (1501) and abuts against the top surface of the support plate (150).

8. The clamping system for tensioning both ends of external prestressing according to claim 1, characterized in that: The connecting portion (200) comprises a connecting rod (210); a connecting tenon block (400) is fixed to the end of the first clamping member (110) close to the binding portion (300); A first tenon block (2101) is fixed to the end of the connecting rod (210), and a first tenon groove (2102) adapted to the first tenon block (2101) is provided at the end of the connecting rod (210) corresponding to the first tenon block (2101); The number of the connecting rods (210) is multiple, and the first tenon blocks (2101) at two opposite ends of the multiple connecting rods (210) are inserted into the first tenon grooves (2102) and fastened by bolts; The connecting tenon block (400) is inserted into the first tenon groove (2102) of the connecting rod (210) adjacent thereto, and the connecting tenon block (400) is fastened to the first tenon block (2101) corresponding thereto by means of bolts.

9. A clamping system for tensioning both ends of external prestressing according to claim 8, characterized in that: It also includes a steering rod (220); the steering rod (220) is arranged between two adjacent connecting rods (210), and the steering rod (220) includes a first steering rod (2203) and a second steering rod (2204); the first ends of the first steering rod (2203) and the second steering rod (2204) are both fixed with a second tenon block (2201), and the ends corresponding to the second tenon block (2201) are provided with a second tenon groove (2202) adapted to the first tenon block (2101); the first steering rod (2203) and the second steering rod (2204) are hinged at their second ends; The second tenon blocks (2201) of the first steering rod (2203) and the second steering rod (2204) are inserted into the first tenon grooves (2102) of the connecting rod (210) adjacent thereto, and the corresponding first tenon blocks (2101) are inserted into the second tenon grooves (2202) and fastened by bolts.

10. A clamping system for tensioning both ends of external prestressing according to claim 9, characterized in that: It also includes a rotating shaft (230), the connecting part (200) is provided with two and arranged symmetrically, and the rotating shaft (230) passes through the second ends of the first steering rod (2203) and the second steering rod (2204) so ​​that the first steering rod (2203) and the second steering rod (2204) can rotate relative to each other around the rotating shaft (230).

Images