Post-tensioned prestressed steel strand bidirectional anchoring system

Abstract

The invention provides a post-tensioned prestressed steel strand bidirectional anchoring system, which belongs to the technical field of anchoring systems, and comprises a steel strand, a tool anchor, a center hole jack, a limiting plate and a bidirectional anchoring plate, one side of the center hole jack is used for arranging a tool anchor, the other side of the center hole jack is used for arranging a limiting plate, and the outer side of the limiting plate is used for arranging a bidirectional anchoring anchor plate; the steel strand is used for transversely penetrating through the tool anchor, the center hole jack, the limiting plate and the two-way anchoring anchor plate. The defects that in the prior art, steel strands are prone to wire breakage and bundle breakage, anchoring clamping pieces are prone to brittle failure, fragments are prone to splashing, safety accidents are extremely prone to being caused, the steel strands are corroded due to long-term stress fatigue and lack of slurry protection, and the steel strands are extremely prone to breakage, break through anchor sealing concrete and pop out of the body, and potential safety hazards are generated in the operation stage are effectively overcome.

Description

Technical Field

[0001] The invention belongs to the technical field of anchoring systems, and particularly relates to a post-tensioned prestressed steel strand bidirectional anchoring system. Background Art

[0002] As mentioned in the prior art solution in the patent publication number "CN209482131U", currently, the application of post-tensioned prestressed tendons is becoming more and more common. Post-tensioned prestressed tendons are key materials used in construction projects to enhance the crack resistance and bearing capacity of concrete structures. Its core feature is to first pour the concrete component, and then tension the prestressed tendon and anchor it after the strength reaches the standard.

[0003] After the traditional post-tensioned prestressed steel strand is tensioned, a unidirectional anchoring system is adopted. The anchoring system is as Figure 1 shown. It includes a steel strand 1, a tool anchor 2, a through-hole jack 3, a limit plate 4, an anchor plate 5 and a positive anchoring clip 6; the steel strand 1 penetrates through the through-hole jack 3, one side of the through-hole jack 3 is fixed with the tool anchor 2, and the other side of the through-hole jack 3 is fixed with the limit plate 4, the anchor plate 5 and the positive anchoring clip 6.

[0004] Specifically, the anchoring system of the traditional post-tensioned prestressed tendon is unidirectional, which only meets the usage requirements in its working state and cannot meet the safety requirements during the construction period and operation period. The specific defects are as follows: 1. Before the strength of the grouting slurry reaches the design strength after the tensioning is completed, during this period, wire breakage and strand breakage of the steel strand are likely to occur. After the wire breakage and strand breakage of the steel strand occur, the ejection force of the steel strand is as high as about 20t; it is extremely likely to cause safety accidents.

[0005] 2. Before grouting, cutting and sealing the anchor of the steel strand are required, which is affected by cutting vibration and heat transfer. At the same time, the carbon content of the material of the anchoring clip is high, and due to stress fatigue and the influence of sundries, the local compression is too large. The anchoring clip is prone to brittle fracture, and the fragments are prone to splash, which is extremely likely to cause safety accidents.

[0006] 3. Due to the long and narrow prestressed duct and reasons such as workers' operations, the grouting in the duct is not full, the steel strand is under long-term stress fatigue, and it lacks the protection of the slurry and rusts. It is extremely likely to break and break through the sealed anchor concrete and pop out of the body, posing a safety hazard to the operation stage. Summary of the Invention

[0007] In order to solve the defects in the prior art, the invention provides a post-tensioned prestressed steel strand bidirectional anchoring system, which effectively avoids the defects in the prior art that wire breakage and strand breakage of the steel strand are likely to occur, the anchoring clip is prone to brittle fracture, the fragments are prone to splash, it is extremely likely to cause safety accidents, the steel strand is under long-term stress fatigue and lacks the protection of the slurry and rusts, and it is extremely likely to break and break through the sealed anchor concrete and pop out of the body, posing a safety hazard to the operation stage.

[0008] The present invention uses the following technical solutions.

[0009] A post-tensioning prestressed steel strand bidirectional anchoring system, comprising: Steel strands, tool anchors, through-type jacks, limit plates and two-way anchor plates; One side of the through-type jack is used to set the tool anchor, and the other side of the through-type jack is used to set the limit plate, and the outer side of the limit plate is used to set the two-way anchor plate; The stranded wire is used to pass horizontally through tool anchors, through-type jacks, limit plates and bidirectional anchor plates.

[0010] Further, the bidirectional anchor plate includes a bidirectional anchor cup, a reverse anchor clip pressure plate and a reverse clamping bolt; A reverse anchoring clip pressure plate is buckled around the outer end wall of the bidirectional anchor cup; A plurality of reverse compression bolts are used for reverse anchoring the clamp plate and screwing the clamp plate.

[0011] Furthermore, the thickness of the reverse anchoring clip pressure plate is 5 mm to 12 mm.

[0012] Furthermore, the bidirectional anchor cup is a columnar structure, and a plurality of ear plates are arranged on the outer peripheral wall of the bidirectional anchor cup. A plurality of through holes are opened on the ear plates, and the plurality of through holes respectively penetrate the reverse clamping bolts configured therefor.

[0013] Furthermore, the number of the ear plates and the reverse clamping bolts are both four, and the ear plates 13 are evenly arranged on the outer peripheral wall of the bidirectional anchor cup.

[0014] Furthermore, an accommodating opening is provided on the outer end wall of the bidirectional anchor cup, and the accommodating opening is used to accommodate the pressing block in the center of the reverse anchor clip pressing plate.

[0015] Furthermore, a forward anchoring groove and a reverse anchoring groove are sequentially opened from the inside to the outside of the bidirectional anchor cup. The forward anchoring groove and the reverse anchoring groove are connected to form a through groove. The number of the through grooves is the same as the number of steel strands. The forward anchoring groove and the reverse anchoring groove are respectively used to set the forward anchoring clip and the reverse anchoring clip, and a spring is provided in the reverse anchoring clip.

[0016] Furthermore, the thrust force of the spring is greater than the friction force between the reverse anchoring clip and the steel strand.

[0017] Furthermore, annular iron sheets are arranged on both sides of one end of the spring facing the reverse anchoring clip.

[0018] Furthermore, the forward anchoring clip and the reverse anchoring clip are arranged in mirror images, and the conical head of the forward anchoring clip and the conical head of the reverse anchoring clip are arranged opposite to each other.

[0019] Furthermore, the reverse anchoring wedge pressing plate includes a columnar cylinder. A pressing block is provided at the middle of the columnar cylinder. The thickness of the pressing block is 2 mm. Four uniformly distributed supporting arms are provided on the outer peripheral wall of the columnar cylinder. A number of through holes are opened on the end wall of the columnar cylinder. The number of through holes corresponds one by one to a number of through grooves and they are arranged facing each other. A through-type internal thread is opened on the supporting arm. One internal thread is arranged facing the through hole of one ear plate. The internal thread is used for screwing with the reverse pressing bolt.

[0020] The beneficial effects of the present invention are as follows. Compared with the prior art, the technical effects of the present invention are as follows: The two-way anchoring anchor plate has independent anchor cups and wedges facing forward and backward respectively, achieving the purpose of two-way locking of the prestressed steel strand. The two-way locking structure enables the strength of the steel strand to be effectively enhanced during the period from the completion of tensioning to the time when the strength of the grouting slurry does not reach the design strength. The steel strand will not break or break into bundles, effectively avoiding the problem of causing safety accidents. The structure of the two-way anchoring anchor plate avoids the defect that the carbon content of the material of the one-way anchoring wedge is high, and due to stress fatigue and the influence of sundries, the local compression is too large, so that the overall compression is balanced. The anchoring wedge will not brittlely break, effectively avoiding the problem of causing safety accidents. The two-way anchoring anchor plate also enables the steel strand not to generate long-term stress fatigue, thus avoiding the defect that it is extremely easy to break and break through the sealed anchor concrete and pop out of the body, posing a safety hazard to the operation stage. Description of the Drawings

[0021] Figure 1 is a schematic plan view of a one-way anchoring system for post-tensioned prestressed steel strands in the prior art.

[0022] Figure 2 is a schematic plan view of a two-way anchoring system for post-tensioned prestressed steel strands in the present invention.

[0023] Figure 3 is a schematic plan view of the two-way anchoring anchor plate of the two-way anchoring system for post-tensioned prestressed steel strands in the present invention.

[0024] Figure 4 is a schematic plan view of the reverse anchoring wedge pressing plate of the two-way anchoring anchor plate of the two-way anchoring system for post-tensioned prestressed steel strands in the present invention.

[0025] Figure 5 is a cross-sectional view of the two-way anchoring anchor cup of the two-way anchoring system for post-tensioned prestressed steel strands in the present invention; Figure 6 is a schematic view of the spring of the two-way anchoring system for post-tensioned prestressed steel strands in the present invention; Figure 7 is a front view of the reverse anchoring wedge pressing plate of the two-way anchoring system for post-tensioned prestressed steel strands in the present invention; Figure 8It is a side view of the reverse anchoring wedge plate of the post-tensioned prestressed steel strand two-way anchoring system in the present invention.

[0026] Reference numerals in the attached drawings: 1, steel strand; 2, tool anchor; 3, hole-through jack; 4, limiting plate; 5, anchor plate; 6, forward anchoring wedge; 7, two-way anchoring anchor plate; 8, forward anchoring wedge; 9, reverse anchoring wedge; 10, two-way anchoring anchor cup; 11, reverse anchoring wedge plate; 12, reverse pressing bolt; 13, ear plate; 14, pressing block; 15, forward anchoring groove; 16, reverse anchoring groove; 17, spring; 18, annular iron sheet; 19, cylindrical tube; 20, support arm; 21, through hole; 22, internal thread. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only a part of the embodiments of the present invention, rather than all the embodiments. According to the spirit of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] As Figures 2 to 8 shown, a post-tensioned prestressed steel strand two-way anchoring system includes: The difference between the present invention and the traditional single-way anchoring system lies in that: a two-way anchoring anchor plate is used instead of the original single-way anchoring anchor plate. The specific structure is as follows: Steel strand 1, tool anchor 2, hole-through jack 3, limiting plate 4 and two-way anchoring anchor plate 7; The two-way anchoring anchor plate 7 has independent anchor cups and wedges facing forward and backward respectively, achieving the purpose of two-way locking of the prestressed steel strand. The two-way locking structure enables the strength of the steel strand 1 to be effectively enhanced during the period from the completion of tensioning to the time when the strength of the grouting slurry does not reach the designed strength. The steel strand 1 will not break or break into bundles, effectively avoiding the problem of causing safety accidents. The structure of the two-way anchoring anchor plate 7 avoids the defect that the carbon content of the material of the single-way anchoring wedge is high, and due to stress fatigue and the influence of sundries, the local compression is too large, so that the overall compression is balanced. The anchoring wedge will not brittlely break, effectively avoiding the problem of causing safety accidents. The two-way anchoring anchor plate also prevents the steel strand from generating long-term stress fatigue, thus avoiding the defect that it is extremely easy to break and break through the sealed anchor concrete and pop out of the body, posing a safety hazard during the operation stage.

[0029] One side of the hole-through jack 3 is used to set the tool anchor 2, the other side of the hole-through jack 3 is used to set the limiting plate 4, and the outside of the limiting plate 4 is used to set the two-way anchoring anchor plate 7; The steel strand 1 is used to be transversely penetrated through the tool anchor 2, the through-type jack 3, the limit plate 4 and the bidirectional anchor plate 7.

[0030] In a preferred but non-limiting embodiment of the present invention, the bidirectional anchor plate 7 includes a bidirectional anchor cup 10, a reverse anchor clip plate 11 and a reverse clamping bolt 12; A reverse anchoring clip plate 11 is buckled around the outer end wall of the bidirectional anchor cup 10; A plurality of reverse clamping bolts 12 are used for reverse anchoring the clip clamping plate 11 and screwing them together.

[0031] In a preferred but non-limiting embodiment of the present invention, the thickness of the reverse anchoring clip plate 11 is 5 mm to 12 mm.

[0032] In a preferred but non-limiting embodiment of the present invention, the bidirectional anchor cup 10 is a columnar structure, and a plurality of ear plates 13 are arranged on the outer peripheral wall of the bidirectional anchor cup 10, and a plurality of through holes are opened on the ear plates 13, and the plurality of through holes are respectively through-perforated with reverse clamping bolts 12 configured therefor.

[0033] In a preferred but non-limiting embodiment of the present invention, the number of the ear plates 13 and the number of the reverse clamping bolts 12 are both four, and the ear plates 13 are evenly arranged on the outer peripheral wall of the bidirectional anchor cup 10 .

[0034] In a preferred but non-limiting embodiment of the present invention, a receiving opening is provided on the outer end wall of the bidirectional anchor cup 10 , and the receiving opening is used to receive the pressing block 14 in the center of the reverse anchor clip pressing plate 11 .

[0035] In a preferred but non-limiting embodiment of the present invention, a forward anchoring groove 15 and a reverse anchoring groove 16 are sequentially opened from the inside to the outside of the bidirectional anchor cup 10, the forward anchoring groove 15 and the reverse anchoring groove 16 are connected to form a through groove, the number of the through grooves is the same as the number of steel strands, the forward anchoring groove 15 and the reverse anchoring groove 16 are respectively used to set the forward anchoring clip 8 and the reverse anchoring clip 9, and a spring 17 is provided in the reverse anchoring clip 9.

[0036] In a preferred but non-limiting embodiment of the present invention, the forward anchoring groove 15 and the reverse anchoring groove 16 are used for forward anchoring and reverse anchoring respectively, and the spring is used to prevent the steel strand from sliding outward during the tensioning process and driving the reverse anchoring clip to move and anchor. A spring is arranged in the reverse anchoring groove to push the reverse anchoring clip to prevent it from moving inward during the tensioning process. The pushing force of the spring should be greater than the friction between the reverse anchoring clip 9 and the steel strand.

[0037] In a preferred but non-limiting embodiment of the present invention, annular iron sheets 18 are provided on both sides of one end of the spring 17 facing the reverse anchoring clip 9 .

[0038] In a preferred but non-limiting embodiment of the present invention, the forward anchoring wedge 8 and the reverse anchoring wedge 9 are arranged in a mirror image, and the conical heads of the forward anchoring wedge 8 and the reverse anchoring wedge 9 are arranged opposite to each other. When the steel strand penetrates through the through groove, it also penetrates through the forward anchoring wedge 8 and the reverse anchoring wedge 9.

[0039] In a preferred but non-limiting embodiment of the present invention, the reverse anchoring wedge pressing plate 11 includes a columnar cylinder 19. A pressing block 14 is provided in the middle of the columnar cylinder 19. The thickness of the pressing block 14 is 2 mm, which can increase the pressing effect. Four uniformly distributed support arms 20 are provided on the outer peripheral wall of the columnar cylinder 19. A number of through holes 21 are opened on the end wall of the columnar cylinder 19. The number of through holes 21 corresponds one-to-one to the number of through grooves and is arranged facing each other for the steel strand to penetrate through. A through internal thread port 22 is opened on the support arm 20. One internal thread port 22 is arranged facing the through hole of one ear plate. The internal thread port 22 is used for screwing with the reverse pressing bolt 12.

[0040] The working principle of the present invention is as follows: ① Install the reverse anchoring wedge pressing plate, reverse anchoring wedge, two-way anchoring anchor cup, forward anchoring wedge, limit plate, through-hole jack and tool anchor in sequence.

[0041] ② The through-hole jack starts the tensioning oil cylinder, and the piston of the oil cylinder extends. The anchoring length of the steel strand at the tool anchor is elongated. At this time, the forward anchoring wedge does not slide with the steel strand under the limitation of the limit plate; the reverse anchoring wedge does not slide with the steel strand under the pushing of the anti-anchoring spring.

[0042] ③ When the tensioning reaches the design tension, the through-hole jack retracts. The forward anchoring wedge completes forward anchoring under the drive of the retraction of the steel strand.

[0043] ④ Rotate the reverse pressing bolt to drive the reverse anchoring wedge pressing plate to press the reverse anchoring wedge to complete reverse anchoring.

[0044] ⑤ Remove the tool anchor, through-hole jack, etc. to complete the tensioning of one duct.

[0045] The beneficial effects of the present invention are as follows. Compared with the prior art, the technical effects of the present invention are as follows: The two-way anchoring anchor plate has independent anchor cups and wedge grips facing forward and backward respectively, achieving the purpose of two-way locking of the prestressed steel strand. The two-way locking structure enables the strength of the steel strand to be effectively enhanced during the period from the completion of tensioning to the time when the strength of the grouting paste has not reached the design strength. Wire breaking and strand breaking of the steel strand will not occur, effectively avoiding the problem of causing safety accidents. The structure of the two-way anchoring anchor plate avoids the defect that the carbon content of the material of the single-way anchoring wedge grip is high, and local compression is too large due to stress fatigue and the influence of impurities, so that the overall compression is balanced. The anchoring wedge grip will not brittlely break, effectively avoiding the problem of causing safety accidents. The two-way anchoring anchor plate also prevents the steel strand from generating long-term stress fatigue, thus avoiding the defect that it is extremely easy to break and break through the sealed anchor concrete and pop out of the body, posing a safety hazard during the operation stage.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific implementation manners of the present invention, and any modifications or equivalent replacements without departing from the spirit and scope of the present invention shall be covered within the protection scope of the claims of the present invention.

Claims

1. A post-tensioned prestressed steel strand bidirectional anchorage system, characterized in that: include: Steel strands, tool anchors, through-type jacks, limit plates and two-way anchor plates; One side of the through-type jack is used to set the tool anchor, and the other side of the through-type jack is used to set the limit plate, and the outer side of the limit plate is used to set the two-way anchor plate; The stranded wire is used to pass horizontally through tool anchors, through-type jacks, limit plates and bidirectional anchor plates.

2. The post-tensioned prestressed steel strand bidirectional anchoring system according to claim 1, characterized in that: The bidirectional anchor plate includes a bidirectional anchor cup, a reverse anchor clip plate and a reverse clamping bolt; A reverse anchoring clip pressure plate is buckled around the outer end wall of the bidirectional anchor cup; A plurality of reverse compression bolts are used for reverse anchoring the clamp plate and screwing the clamp plate.

3. The post-tensioning prestressed steel strand bidirectional anchoring system according to claim 2, characterized in that: The thickness of the reverse anchor clip pressure plate is 5mm~12mm.

4. The post-tensioned prestressed steel strand bidirectional anchoring system according to claim 3, characterized in that: The bidirectional anchor cup is a columnar structure, and a plurality of ear plates are arranged on the outer peripheral wall of the bidirectional anchor cup, and a plurality of through holes are opened on the ear plates, and the plurality of through holes are respectively through-holes for providing reverse compression bolts configured therefor; The number of the ear plates and the reverse clamping bolts are both four, and the ear plates 13 are evenly arranged on the outer peripheral wall of the bidirectional anchor cup.

5. The post-tensioning prestressed steel strand bidirectional anchoring system according to claim 4, characterized in that: An accommodating opening is provided on the outer end wall of the bidirectional anchor cup, and the accommodating opening is used to accommodate the pressing block in the center of the reverse anchor clip pressing plate.

6. The post-tensioned prestressed steel strand bidirectional anchoring system according to claim 5, characterized in that: A forward anchoring groove and a reverse anchoring groove are opened in sequence from the inside to the outside of the bidirectional anchor cup. The forward anchoring groove and the reverse anchoring groove are connected to form a through groove. The number of the through grooves is the same as the number of steel strands. The forward anchoring groove and the reverse anchoring groove are used to set the forward anchoring clip and the reverse anchoring clip respectively. A spring is arranged in the reverse anchoring clip.

7. The post-tensioned prestressed steel strand bidirectional anchoring system according to claim 6, characterized in that: The thrust of the spring is greater than the friction between the reverse anchor clip and the steel strand.

8. The post-tensioning prestressed steel strand bidirectional anchoring system according to claim 7, characterized in that: Annular iron sheets are arranged on both sides of one end of the spring facing the reverse anchoring clip.

9. The post-tensioning prestressed steel strand bidirectional anchoring system according to claim 8, characterized in that: The forward anchoring clip and the reverse anchoring clip are arranged in mirror images, and the conical head of the forward anchoring clip and the conical head of the reverse anchoring clip are arranged opposite to each other.

10. The post-tensioning prestressed steel strand bidirectional anchoring system according to claim 9, characterized in that: The reverse anchoring clip pressure plate includes a cylindrical tube, a pressure block is arranged in the middle of the cylindrical tube, the thickness of the pressure block is 2mm, four evenly distributed support arms are arranged on the outer peripheral wall of the cylindrical tube, a plurality of through holes are opened on the end wall of the cylindrical tube, the plurality of through holes correspond to a plurality of through grooves one by one and are arranged opposite to each other, a through-type internal thread opening is opened on the support arm, an internal thread opening is arranged opposite to a through hole of an ear plate, and the internal thread opening is used for screwing with the reverse tightening bolt.

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