A prestressed anchor cable head protection device

Abstract

The application belongs to the technical field of anchor cable construction, in particular to a prestressed anchor cable head protection device, which comprises a protection unit arranged outside a steel backing plate; the protection unit is used for packaging the end of a steel strand arranged in the steel backing plate; the protection unit comprises: a first connecting part; one end of the first connecting part is in clamping cooperation with the outside of the steel backing plate; a second connecting part; the second connecting part is in sliding cooperation with the first connecting part, and the other end of the first connecting part is arranged in the second connecting part; the end of the steel strand is arranged through the first connecting part, and the end is arranged in the second connecting part; the first spring arranged between the second connecting part and the first connecting part is extruded to generate elastic potential energy; the elastic potential energy of the first spring can be used to consume or buffer the elastic potential energy when the steel strand breaks, so that the steel strand can be prevented from bouncing out to cause harm to the construction personnel when the construction personnel replaces the steel strand, and the rapid replacement of the steel strand is completed.

Description

Technical Field

[0001] This invention belongs to the field of anchor cable construction technology, specifically a prestressed anchor cable head protection device. Background Technology

[0002] Anchor cable installation is a common construction technique used primarily for supporting and securing large buildings. Its advantages include providing strong support and stability while reducing building weight and cost. Anchor cable installation is a technique that uses steel cables and anchors to secure buildings.

[0003] Anchor cables generally consist of steel plates, anchorages, steel strands, and wedges. During construction, holes are first drilled in the building foundation. The steel strands are then passed through the holes and fixed to the building structure using anchorages. After the steel strands are inserted into the holes, jacks are used to tension the exposed ends of the strands, increasing their prestress. The jacks are then removed, and the elastic potential energy of the steel strands causes the wedges clamped to the outside to slide into the anchorages. The wedges between the wedges and the anchorages clamp the steel strands to the wedges, and the anchorages to the steel plates fixed to the building's exterior, maintaining maximum prestress and improving the building's structural strength and stability.

[0004] Currently, after tensioning the steel strands, it is necessary to wait for the steel strands to retract so that the steel strands, clamps, anchors, and steel pads can be tightly secured. Therefore, cement cannot be poured in immediately. However, due to inconsistent construction standards or steel strand production quality, some steel strands may break during the retraction phase after tensioning. As a result, the elastic potential energy of the steel strands causes them to pop out of the holes. Because of their high speed, these popped-out steel strands can pose a significant safety hazard to construction workers. Therefore, in existing technologies, during the anchor cable construction phase, construction workers must be instructed to strictly follow the construction requirements to prevent steel strands from popping out and avoid injuries or fatalities to construction workers.

[0005] Therefore, the present invention provides a prestressed anchor head protection device. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a prestressed anchor cable head protection device of the present invention, comprising a protection unit disposed on the outside of a steel pad; the protection unit is used to encapsulate the end of the steel strand passing through the steel pad;

[0008] The protection unit includes:

[0009] First connecting part; one end of the first connecting part is engaged with the outer side of the steel pad;

[0010] The second connecting part is slidably fitted with the first connecting part, and the other end of the first connecting part passes through the second connecting part; the end of the steel strand passes through the first connecting part and is located inside the second connecting part.

[0011] A first spring; the first spring is used to tighten the first connecting part and the second connecting part;

[0012] A baffle is slidably connected to one end of the second connecting part; a second spring is fixedly connected between the baffle and the second connecting part; an alarm bell and a power supply are fixedly connected to the outside of one end of the second connecting part; corresponding electrode plates are respectively provided on the baffle and the second connecting part.

[0013] Preferably, the outer side of the steel pad is threaded with multiple screws, and the multiple screws are arranged in a circular array; the first connecting part includes a connecting plate, a conduit sleeve and a partition plate; the two ends of the conduit sleeve are respectively fixed to the connecting plate and the partition plate; the screws are engaged with the connecting plate; the first spring is sleeved on the conduit sleeve.

[0014] Preferably, the connecting plate has multiple anti-detachment grooves; the screw is slidably engaged with the anti-detachment grooves.

[0015] Preferably, the second connecting part includes a first assembly part and a second assembly part; the second assembly part is engaged with the first assembly part; a ring plate is slidably connected to one end of the first assembly part adjacent to the alarm bell, and the ring plate is used to limit the second assembly part; the baffle is engaged with the ring plate.

[0016] Preferably, the first assembly includes a first half-tube sleeve, a first sealing plate, and a rear sealing plate; the first sealing plate and the rear sealing plate are respectively fixed to both ends of the first half-tube sleeve; the first sealing plate is snapped onto the surface of the tube sleeve; the ring plate is slidably connected to the surface of the first half-tube sleeve; a plurality of limiting rods are fixed between the rear sealing plate and the first sealing plate; the limiting rods penetrate the ring plate.

[0017] Preferably, the second assembly includes a second half-tube sleeve and a second sealing plate; one end of the second half-tube sleeve is fixed to the second sealing plate, and the first sealing plate is correspondingly snapped onto the surface of the conduit sleeve; the first sealing plate and the second sealing plate are flush; a mating groove is provided on one side of the first half-tube sleeve, and the second half-tube sleeve is snapped onto the first half-tube sleeve through the mating groove; the ring plate slides on the surface of the second half-tube sleeve.

[0018] Preferably, the first half-tube sleeve has a first sliding groove, and the second half-tube sleeve has a corresponding second sliding groove; the two ends of the baffle are fixedly connected with connecting ears, and the connecting ears are slidably connected in the first sliding groove and the second sliding groove respectively.

[0019] Preferably, the two ends of the first spring abut against the first sealing plate, the second sealing plate, and the partition.

[0020] Preferably, an observation window is provided on the second half-tube sleeve.

[0021] Preferably, a spring clip is axially provided inside the connecting ear, and the output end of the spring clip passes through the ring plate.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. The prestressed anchor head protection device of the present invention, through the sleeved cooperation of the first connecting part and the second connecting part, when the steel strand is ejected, can use the elastic potential energy of the steel strand to push the baffle. When the baffle contacts the two electrode plates on the second connecting part, due to the large elastic potential energy of the steel strand, it will put pressure on the second connecting part, causing the second connecting part to separate from the first connecting part, that is, the overlapping area is reduced. At this time, the first spring located between the second connecting part and the first connecting part is compressed and generates elastic potential energy. The elastic potential energy of the first spring can be used to consume or buffer the elastic potential energy when the steel strand breaks, thereby preventing the steel strand from ejecting and causing injury to the construction personnel when the steel strand is replaced, and at the same time completing the rapid replacement of the steel strand.

[0024] 2. The prestressed anchor head protection device of the present invention uses a connecting plate and a screw rod in a snap-fit ​​connection. A nut is threadedly connected to the outer end of the screw rod. The size of the opening of the anti-detachment groove should be larger than the size of the nut. During assembly, the three screw rods and the nut are first inserted into the connecting plate through the opening of the anti-detachment groove, and then rotated to ensure a tight connection between the connecting plate and the steel pad. At the same time, when the steel strand is ejected, since the first connecting part and the second connecting part are sleeved, when the second connecting part moves outward and pulls the first connecting part, the connecting plate and the screw rod can be tightly connected, thereby achieving protection against the ejection of the steel strand. Correspondingly, using the above method, the entire protective unit can be easily separated from the steel strand. That is, after the steel strand is retracted, the entire protective unit can be separated from the steel pad by rotating the connecting plate, thereby accelerating the construction progress. Attached Figure Description

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] Figure 1 This is a perspective view of the present invention;

[0027] Figure 2 This is an exploded view of the present invention;

[0028] Figure 3 This is a side view of the present invention;

[0029] Figure 4yes Figure 3 A three-dimensional cross-sectional view of section AA in the middle;

[0030] Figure 5 yes Figure 4 Enlarged view of point I in the image;

[0031] Figure 6 This is an exploded view of the protective unit in this invention;

[0032] Figure 7 This is an assembly diagram of the first connecting part and the first assembly part in this invention;

[0033] Figure 8 This is a perspective view of the first assembly part in this invention;

[0034] Figure 9 This is a perspective view of the second assembly in this invention;

[0035] Figure 10 This is an assembly diagram of the second connecting part in this invention;

[0036] In the diagram: 1. Steel pad; 11. Screw; 2. Steel strand; 31. First connecting part; 311. Connecting plate; 312. Anti-detachment groove; 313. Conduit sleeve; 314. Partition plate; 32. First assembly part; 321. First half-tube sleeve; 322. First sealing plate; 323. Rear sealing plate; 324. Mating groove; 325. Ring plate; 326. Limiting rod; 327. First sliding groove; 33. Second assembly part; 331. Second half-tube sleeve; 332. Second sealing plate; 333. Observation window; 334. Second sliding groove; 34. First spring; 35. Baffle plate; 351. Connecting ear; 352. Second spring; 4. Mobile power supply; 5. Alarm bell; 6. Anchor; 7. Clamping plate. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0038] like Figures 1 to 6 As shown in the embodiment of the present invention, a prestressed anchor head protection device includes a protection unit disposed on the outside of a steel pad 1; the protection unit is used to encapsulate the end of a steel strand 2 passing through the steel pad 1; an anchor 6 is snapped onto the outside of the steel pad 1, and the steel strand 2 passes through the anchor and the steel pad 1; a clamp 7 is sleeved on the steel strand 2 adjacent to the anchor 6, and the clamp 7 is inserted into the anchor 6;

[0039] The protection unit includes:

[0040] First connecting part 31; one end of the first connecting part 31 is engaged with the outer side of the steel pad 1;

[0041] The second connecting part is slidably engaged with the first connecting part 31, and the other end of the first connecting part 31 passes through the second connecting part; the end of the steel strand 2 passes through the first connecting part 31 and is located inside the second connecting part;

[0042] First spring 34; the first spring 34 is used to tighten the first connecting part 31 and the second connecting part;

[0043] A baffle 35 is slidably connected to one end of the second connecting part; a second spring 352 is fixedly connected between the baffle 35 and the second connecting part; an alarm bell 5 and a mobile power supply 4 are fixedly connected to the outside of one end of the second connecting part; corresponding electrode plates are respectively provided on the baffle 35 and the second connecting part.

[0044] During anchor cable construction, steel strand 2, steel pad 1, anchor 6, and clamp 7 are prepared in advance. When using the device, holes are first drilled on the building surface, then the steel pad 1 is installed. Next, the steel strand 2 is threaded into the hole, and the anchor 6 is threaded onto the steel strand 2, abutting against the steel pad 1. Finally, the clamp is fitted onto the steel strand 2. Because the quality of the steel strand 2 varies, breakage is unpredictable. Therefore, during the current construction phase, workers are strictly prohibited from moving under unsecured steel strand 2 to avoid injury or death. When using the device, the first connecting part 31 is first snapped onto the outside of the steel pad 1, with the anchor 6 positioned within the first connecting part 31. Then, the second connecting part is fitted onto the first connecting part 31, maintaining... The first spring 34 is located between the first connecting part 31 and the second connecting part. After the second connecting part is sleeved, the end of the steel strand 2 should be inside the second connecting part, and the distance between one end of the steel strand 2 and the steel pad 1 and the anchor 6 should be at least 50mm. During the retraction stage after the steel strand 2 is tensioned, under normal circumstances, the steel strand 2 will continuously retract towards the anchor 6 and the steel pad 1, that is, the distance between one end of the steel strand 2 and the steel pad 1 and the anchor 6 will gradually decrease, and the clamping piece 7 will continuously slide into the anchor 6. By using wedge clamping, the steel strand 2 can be fixed. Since the anchor 6 is limited by the first connecting part 31, when the clamping piece 7 is driven by the steel strand 2, it is easier to penetrate into the anchor 6 to achieve the purpose of rapid fixation.

[0045] However, in the event of a breakage due to poor quality of the steel strand 2, since the first connecting part 31 and the second connecting part are sleeved together, when the steel strand 2 pops outward, the second connecting part can be used to block the end of the steel strand 2, preventing it from directly hitting the construction personnel. Simultaneously, when the steel strand 2 pops out, it will first contact the baffle 35, causing the baffle 35 to move towards one end of the second connecting part. This allows the electrode plate on the baffle 35 to contact the electrode plate inside one end of the second connecting part, creating a pathway between the mobile power supply 4 and the alarm bell 5. This causes the alarm bell 5 to sound an alarm, which can then be used as a warning of anchor cable fixation failure. If an error or malfunction occurs, the construction personnel are notified to find the root cause of the problem or replace the steel strand 2 and re-lay it. When the steel strand 2 pops out, when the baffle 35 contacts the two electrode plates on the second connecting part, the steel strand 2 has a large elastic potential energy, which will put pressure on the second connecting part, causing the second connecting part to move under pressure. At this time, the first spring 34 located between the second connecting part and the first connecting part 31 is squeezed and generates elastic potential energy. The elastic potential energy of the first spring 34 can be used to consume or buffer the elastic potential energy when the steel strand 2 breaks, thereby avoiding injury to the construction personnel caused by the broken and popped steel strand.

[0046] In addition, since the exposed part of the steel strand 2 may scratch the construction workers during the construction stage, the end of the steel strand 2 is sealed by using the second connecting part and the first connecting part 31 to prevent the end of the steel strand 2 from scratching the construction workers. That is, in addition to preventing the construction workers from being scratched, this protective unit can also prevent the steel strand 2 from popping out and consume the potential energy of the popped steel strand 2.

[0047] like Figures 1 to 2 As shown, the outer side of the steel pad 1 is threaded with multiple screws 11, and the multiple screws 11 are arranged in a ring array; the first connecting part 31 includes a connecting plate 311, a conduit sleeve 313 and a partition plate 314; the two ends of the conduit sleeve 313 are respectively fixed to the connecting plate 311 and the partition plate 314; the screws 11 are engaged with the connecting plate 311; the first spring 34 is sleeved on the conduit sleeve 313. The screw 11 is threadedly connected to the steel pad 1. When it is necessary to protect the steel strand 2 after tensioning and retraction, the connecting plate 311 is engaged with the screw 11 to fix the connecting plate 311, that is, to fix the first connecting part 31. When the steel strand 2 breaks and pops out, the end of the steel strand 2 puts pressure on the second connecting part. At the same time, because the first connecting part 31 is fixed, the steel strand 2 will drive the second connecting part and the first connecting part 31 to generate relative displacement. The first spring 34 is compressed and generates elastic potential energy, thereby consuming the elastic potential energy of the steel strand 2. The conduit sleeve 313 is used to limit the first spring 34, and the inside of the conduit sleeve 313 is used for the steel strand 2 to pass through.

[0048] like Figures 6 to 7As shown, the connecting plate 311 has multiple anti-detachment grooves 312; the screw 11 is slidably engaged with the anti-detachment grooves 312. The engagement between the connecting plate 311 and the screw 11 depends on the anti-detachment grooves 312. When the connecting plate 311 and the screw 11 are engaged, one end of the anti-detachment groove 312 is aligned with the screw 11. Then, by rotating the connecting plate 311, the screw 11 can slide to the other end of the anti-detachment groove 312. A nut is fixed to the outer end of the screw 11. The size of the opening at one end of the anti-detachment groove 312 should be larger than the size of the nut, and only the opening size should be larger than the nut size, while the other dimensions of the anti-detachment groove 312 should be smaller than the nut size. This prevents the nut from slipping out of the middle of the anti-detachment groove 312. During assembly, the three screws 11 and the nut are first passed through the opening of the anti-detachment groove 312. Rotating the connecting plate 311 ensures a tight connection between it and the steel pad 1. Simultaneously, when the steel strand 2 is ejected, the first connecting part 31 and the second connecting part are sleeved together. Therefore, the outward movement of the second connecting part, along with the pressure applied to the first connecting part 31 by the first spring 34, pulls the connecting plate 311 and the screw 11 tightly together, thus providing protection against the ejection of the steel strand 2. Correspondingly, this method also allows for easy separation of the protective unit from the steel strand 2. After the steel strand 2 retracts, rotating the connecting plate 311 directly detaches the entire protective unit from the steel pad 1, thereby accelerating the construction progress.

[0049] like Figures 8 to 10 As shown, the second connecting part includes a first assembly part 32 and a second assembly part 33; the second assembly part 33 is engaged with the first assembly part 32; a ring plate 325 is slidably connected to one end of the first assembly part 32 adjacent to the alarm bell 5, and the ring plate 325 is used to limit the second assembly part 33; the baffle 35 is engaged with the ring plate 325. To facilitate the connection of the second connecting part to the first connecting part 31, during the installation of the second connecting part, the first assembly part 32 is first fitted onto the conduit sleeve 313, and then the second assembly part 33 is snapped onto the first assembly part 32. The ring plate 325 is then slid so that it is also fitted onto the second assembly part 33, thus achieving the fitting of the first connecting part 31 and the second connecting part. That is, when the first assembly part 32 and the second assembly part 33 are assembled onto the first connecting part 31, the ring plate 325 can be used to pre-fix the first assembly part 32 and the second assembly part 33, which can then be tightened using cable ties or wire. After the first connecting part 31 and the second connecting part are fitted together, the end of the steel strand 2 is positioned adjacent to the baffle 35. If the steel strand 2 retracts normally, it will not touch the baffle 35. If the steel strand 2 breaks and pops out, it will contact the baffle 35 and push the baffle 35 to move, triggering an alarm.

[0050] like Figure 8As shown, the first assembly 32 includes a first half-tube sleeve 321, a first sealing plate 322, and a rear sealing plate 323; the first sealing plate 322 and the rear sealing plate 323 are respectively fixed to both ends of the first half-tube sleeve 321; the first sealing plate 322 is snapped onto the surface of the tube sleeve 313; the ring plate 325 is slidably connected to the surface of the first half-tube sleeve 321; a plurality of limiting rods 326 are fixed between the rear sealing plate 323 and the first sealing plate 322; the limiting rods 326 penetrate the ring plate 325. When connecting the first assembly 32, the first sealing plate 322 should be secured to the conduit sleeve 313, and the rear sealing plate 323 should be adjacent to the end of the steel strand 2. The first half-pipe sleeve 321 should be kept axially parallel to the first connecting part 31. Then, the second assembly 33 should be engaged with the first assembly 32. The ring plate 325 is located on the first half-pipe sleeve 321 adjacent to the rear sealing plate 323. When assembling the first assembly 32 and the second assembly 33, the ring plate 325 should be slid out from the rear sealing plate 323 and slid onto the second assembly 33 to limit and pre-fix the second assembly 33, so as to keep the second connecting part parallel to the first connecting part 31. Then, cable ties or wire can be used to tighten it.

[0051] like Figure 9 As shown, the second assembly 33 includes a second half-tube sleeve 331 and a second sealing plate 332; one end of the second half-tube sleeve 331 is fixed to the second sealing plate 332, and the first sealing plate 322 is correspondingly snapped into the surface of the conduit sleeve 313; the first sealing plate 322 and the second sealing plate 332 are flush; a mating groove 324 is provided on one side of the first half-tube sleeve 321, and the second half-tube sleeve 331 is snapped into the first half-tube sleeve 321 through the mating groove 324; the ring plate 325 slides on the surface of the second half-tube sleeve 331. After the first assembly part 32 is snapped onto the conduit sleeve 313, the second assembly part 33 is immediately snapped into the mating groove 324. Then, the second assembly part 33 can be pre-fixed by the construction personnel sliding the ring plate 325. The second sealing plate 332 cooperates with the first sealing plate 322 to keep the second connecting part and the first connecting part 31 axially parallel, thereby avoiding affecting the elastic potential energy acting on the side wall of the second connecting part when the steel strand 2 is ejected, which would affect the potential energy consumption of the steel strand 2.

[0052] like Figures 8 to 10As shown, the first half-tube sleeve 321 has a first sliding groove 327, and the second half-tube sleeve 331 has a corresponding second sliding groove 334; the two ends of the baffle 35 are fixedly connected with connecting ears 351, and the connecting ears 351 are slidably connected in the first sliding groove 327 and the second sliding groove 334 respectively. When the steel strand 2 is ejected, the huge elastic potential energy will impact the baffle 35, thus pushing the baffle 35 to contact the sealing plate 323, and causing the two electrode plates to contact, causing the alarm bell 5 to sound, thereby notifying the construction personnel to handle it in time. Secondly, in order to make the baffle 35 slide parallel when it is squeezed and avoid tilting and jamming, connecting ears 351 are provided at both ends of the baffle 35 to limit the position of the baffle 35.

[0053] like Figure 7 As shown, the two ends of the first spring 34 abut against the first sealing plate 322, the second sealing plate 332, and the partition plate 314. The second connecting part is a modular structure, which is intended to facilitate assembly and disassembly, as well as the independent production and transportation of accessories. One end of the first spring 34 abuts against the partition plate 314, and the other end abuts against the first sealing plate 322 and the second sealing plate 332.

[0054] like Figures 9 to 10 As shown, an observation window 333 is provided on the second half-tube sleeve 331. The observation window 333 allows for a direct view of the retraction of the steel strand 2 during its retraction process, facilitating construction personnel to accurately grasp the dismantling time of the protective unit, enabling timely recovery and accelerating project efficiency.

[0055] like Figure 7 As shown, a spring clip is axially arranged inside the connecting ear 351, and the output end of the spring clip passes through the ring plate 325. In order to further improve the stability of the baffle 35 when sliding and avoid the baffle 35 tilting due to pressure sliding, the ring plate 325 and the connecting ear 351 are connected by the spring clip. That is, when the ring plate 325 slides to the position corresponding to the connecting ear 351, the spring clip can be squeezed and locked in the ring plate 325. When the spring clip is locked in the ring plate 325, the spring in the spring clip changes from a relaxed state to a compressed state and then back to a relaxed state.

[0056] Working Principle: Due to the inconsistent quality of the steel strands 2, breakage is unpredictable. Therefore, during the current construction phase, it is strictly forbidden for construction personnel to move under unsecured steel strands 2 to avoid injury or death. When using this device, firstly, the first connecting part 31 is snapped onto the outside of the steel pad 1, with the anchor 6 positioned within the first connecting part 31. Then, the second connecting part is fitted onto the first connecting part 31, keeping the first spring 34 positioned between the first connecting part 31 and the second connecting part. After the second connecting part is fitted, the end of the steel strand 2 should be in a position where... The second connecting part is provided with a distance of at least 50mm between one end of the steel pad 1 and the anchor 6. During the retraction phase after the steel strand 2 is tensioned, under normal circumstances, the steel strand 2 will continuously retract towards the anchor 6 and the steel pad 1, that is, the distance between one end of the steel strand 2 and the steel pad 1 and the anchor 6 will gradually decrease, and the clamping piece 7 will continuously slide into the anchor 6. The wedge clamping will fix the steel strand 2. Since the anchor 6 is limited by the first connecting part 31, the clamping piece 7 is more likely to be inserted into the anchor 6 when it is driven by the steel strand 2, so as to achieve the purpose of rapid fixation.

[0057] However, in the event of a breakage due to poor quality of the steel strand 2, since the first connecting part 31 and the second connecting part are sleeved together, when the steel strand 2 pops outward, the second connecting part can be used to block the end of the steel strand 2, preventing it from directly hitting the construction personnel. Simultaneously, when the steel strand 2 pops out, it will first contact the baffle 35, causing the baffle 35 to move towards one end of the second connecting part. This allows the electrode plate on the baffle 35 to contact the electrode plate inside one end of the second connecting part, creating a circuit between the mobile power supply 4 and the alarm bell 5. This causes the alarm bell 5 to sound an alarm, which serves as a signal of anchor cable fixing failure or error, notifying the construction personnel to quickly find the root cause of the problem. The source or replacement of steel strand 2 can be used for re-threading. When steel strand 2 pops out, when the baffle 35 contacts the two electrode plates on the second connecting part, the steel strand 2 has a large elastic potential energy, which will put pressure on the second connecting part, causing the second connecting part to separate from the first connecting part 31, that is, the overlapping area is reduced. At this time, the first spring 34 located between the second connecting part and the first connecting part 31 is squeezed and generates elastic potential energy. The elastic potential energy of the first spring 34 can be used to consume or buffer the elastic potential energy when the steel strand 2 breaks, so that when the construction personnel replace the steel strand 2, the steel strand 2 can be prevented from popping out and causing injury to the construction personnel, and the steel strand 2 can be replaced quickly at the same time.

[0058] In addition, since the exposed part of the steel strand 2 may scratch the construction workers during the construction stage, the end of the steel strand 2 is sealed by using the second connecting part and the first connecting part 31 to prevent the end of the steel strand 2 from scratching the construction workers. That is, in addition to preventing the construction workers from being scratched, this protective unit can also prevent the steel strand 2 from popping out and consume the potential energy of the popped steel strand 2.

[0059] When it is necessary to protect the steel strand 2 after tensioning and retraction, the connecting plate 311 is engaged with the screw 11 to fix the connecting plate 311, that is, to fix the first connecting part 31. When the steel strand 2 breaks and pops out, the end of the steel strand 2 exerts pressure on the second connecting part. Since the first connecting part 31 is fixed, it can only drive the second connecting part and the first connecting part 31 to produce relative displacement. That is, the overlapping area of ​​the first connecting part 31 and the second connecting part is reduced, and the first spring 34 is compressed to generate elastic potential energy, thereby consuming the elastic potential energy of the steel strand 2. The conduit sleeve 313 is used to limit the first spring 34, and the inside of the conduit sleeve 313 is used for the steel strand 2 to pass through.

[0060] When the connecting plate 311 and the screw 11 are engaged, one end of the anti-disengagement groove 312 is aligned with the screw 11. Then, by rotating the connecting plate 311, the screw 11 can slide to the other end of the anti-disengagement groove 312. The outer end of the screw 11 is threaded with a nut. The opening size of the anti-disengagement groove 312 should be larger than the nut size. During assembly, the three screws 11 and the nut are first inserted through the opening of the anti-disengagement groove 312 into the connecting plate 311, and then rotated to ensure a tight connection between the connecting plate 311 and the steel pad 1. Meanwhile, when the steel strand 2 is ejected, since the first connecting part 31 and the second connecting part are sleeved, when the second connecting part moves outward and pulls the first connecting part 31, the connecting plate 311 and the screw 11 can be tightly connected, thereby achieving protection against the ejection of the steel strand 2. Correspondingly, by adopting the above method, the protective unit can also be easily separated from the steel strand 2 as a whole. That is, after the steel strand 2 is retracted, the protective unit can be directly separated from the steel pad 1 by rotating the connecting plate 311, thereby speeding up the construction progress.

[0061] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A protective device for prestressed anchor cable heads, characterized in that: It includes a protective unit set on the outside of the steel pad (1); the protective unit is used to encapsulate the end of the steel strand (2) passing through the steel pad (1); the outside of the steel pad (1) is clamped with an anchor (6), and the steel strand (2) passes through the anchor and the steel pad (1); a clamp (7) is sleeved on the steel strand (2) adjacent to the anchor (6), and the clamp (7) is inserted into the anchor (6); The protection unit includes: First connecting part (31); one end of the first connecting part (31) is engaged with the outer side of the steel pad (1); The second connecting part is slidably engaged with the first connecting part (31), and the other end of the first connecting part (31) passes through the second connecting part; the end of the steel strand (2) passes through the first connecting part (31), and the end is located inside the second connecting part; First spring (34); the first spring (34) is used to tighten the first connecting part (31) and the second connecting part; Its features are: A baffle (35) is slidably connected to one end of the second connecting part; a second spring (352) is fixed between the baffle (35) and the second connecting part; an alarm bell (5) and a mobile power supply (4) are fixed to the outside of one end of the second connecting part; corresponding electrode plates are respectively provided on the baffle (35) and the second connecting part. The first connecting part (31) includes a connecting plate (311), a conduit sleeve (313) and a partition (314); the two ends of the conduit sleeve (313) are respectively fixed to the connecting plate (311) and the partition (314). The second connecting part includes a first assembly part (32) and a second assembly part (33); the second assembly part (33) is engaged with the first assembly part (32); a ring plate (325) is slidably connected to one end of the first assembly part (32) adjacent to the alarm bell (5), and the ring plate (325) is used to limit the second assembly part (33); the baffle (35) is engaged with the ring plate (325); The first assembly (32) includes a first half-tube sleeve (321), a first sealing plate (322), and a rear sealing plate (323); the first sealing plate (322) and the rear sealing plate (323) are respectively fixed to both ends of the first half-tube sleeve (321); the first sealing plate (322) is snapped onto the surface of the tube sleeve (313); the ring plate (325) is slidably connected to the surface of the first half-tube sleeve (321); a plurality of limiting rods (326) are fixed between the rear sealing plate (323) and the first sealing plate (322); the limiting rods (326) penetrate the ring plate (325); The second assembly (33) includes a second half-tube sleeve (331) and a second sealing plate (332); one end of the second half-tube sleeve (331) is fixed to the second sealing plate (332), and the first sealing plate (322) is correspondingly snapped into the surface of the conduit sleeve (313); the first sealing plate (322) and the second sealing plate (332) are flush; a mating groove (324) is provided on one side of the first half-tube sleeve (321), and the second half-tube sleeve (331) is snapped into the first half-tube sleeve (321) through the mating groove (324); the ring plate (325) slides on the surface of the second half-tube sleeve (331); The two ends of the first spring (34) abut against the first sealing plate (322), the second sealing plate (332) and the partition plate (314).

2. The prestressed anchor head protection device according to claim 1, characterized in that: The outer side of the steel pad (1) is threaded with multiple screws (11), and the multiple screws (11) are arranged in a ring array; the screws (11) are engaged with the connecting plate (311); the first spring (34) is sleeved on the wire tube sleeve (313).

3. A prestressed anchor head protection device according to claim 2, characterized in that: The connecting plate (311) is provided with multiple anti-detachment grooves (312); the screw (11) is slidably engaged with the anti-detachment grooves (312).

4. A prestressed anchor head protection device according to claim 1, characterized in that: The first half-tube sleeve (321) is provided with a first sliding groove (327), and the second half-tube sleeve (331) is provided with a corresponding second sliding groove (334); the two ends of the baffle (35) are fixedly connected with connecting ears (351), and the connecting ears (351) are slidably connected in the first sliding groove (327) and the second sliding groove (334) respectively.

5. A prestressed anchor head protection device according to claim 1, characterized in that: An observation window (333) is provided on the second half-tube sleeve (331).

6. A prestressed anchor head protection device according to claim 4, characterized in that: A spring clip is axially provided inside the connecting ear (351), and the output end of the spring clip passes through the ring plate (325).

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