A low stress loss, low retraction, self-locking anchor

Abstract

The present invention provides a low-stress loss, low-retraction, self-locking anchor, comprising an anchor plate and a limit plate arranged on the outer wall of the anchor plate; the anchor plate is provided with a plurality of inner conical holes, the inner conical holes are arranged regularly, and a petal-type conical clip is arranged in the inner conical hole, the petal-type conical clip includes at least two claw-type locking pieces, the petal-type conical clip is provided with a synchronous adjustment structure, the synchronous adjustment structure synchronously pushes or leaves the clip to facilitate the movement of the steel strand, a follow-up spring is provided on the outer side of the through-hole washer, and is compressed by the follow-up spring; a limit plate is also provided, the limit plate compresses the follow-up spring to push the petal-type conical clip to the inner conical hole, and the limit plate is fixedly installed on one side of the anchor plate. The present invention provides a low-stress loss, low-retraction, self-locking anchor for prestressed steel strands of road bridges or railway bridges.

Description

Technical Field

[0001] The invention relates to an anchor for a highway bridge or a railway bridge, in particular to a low-stress-loss, low-retraction, self-locking anchor. Background Art

[0002] Prestressed concrete prefabricated hollow slab bridges are a main type of bridge for highway or railway bridges in my country, and are widely used in small and medium span highway bridges. With the rapid growth of transportation volume, vehicle overload and many other unfavorable factors, existing hollow slab bridges need to be reinforced during installation or maintenance. The commonly used reinforcement method is external prestressing reinforcement, which improves the bearing capacity of the bridge by tensioning external prestressed tendons in the tension zone of the bridge. The basic principle is to make full use of the compressive properties of concrete, apply prestress to the beam body through external prestressed tendons, and use the reverse bending moment generated by the prestress to offset part of the internal force generated by the external load, thereby achieving the purpose of improving the performance of the structure and increasing its ultimate bearing capacity.

[0003] Whether the external prestressed reinforcement can achieve the expected reinforcement effect is closely related to the anchorage of the external prestress. For prestressed concrete prefabricated hollow slab bridges, the current anchorage structure and process of external prestressed reinforcement are to install prestressed bundles such as steel strands in the outer wall concrete of the two side slabs on both sides of the hollow slab bridge, and then install the prestressed anchor on one side, and then install the anchor on the other side, tension the external prestressed bundles, etc.

[0004] In the existing working conditions, there is another method that is to embed a hollow pipe in the cap beam above the bridge pier, then pass the steel strand stress bundle, and then install the anchor pads (bearing plates) and prestressed anchors at both ends, and then tension the external prestressed bundle and lock it. The anchor pads under the prestressed anchors are usually made of cast iron parts and are arranged vertically symmetrically at both ends along the plate beam or cap beam, also known as the two end sides.

[0005] Although the existing anchoring system is relatively quick to install and construct, the following problems still exist during installation and construction:

[0006] First, it is difficult to install the engineering anchors at both ends of the plate beam or cap beam in place at one time: when the anchors are installed, the clamps in the holes of each anchor plate, which are also called clamping pieces or locking pieces or clips, often have one end installed in place while the other end is dislocated. That is, under the push of the same direction force of the steel strand on one side, the clip on the other side slides to the outside of the anchor hole of the anchor or falls off, and then a sawing effect occurs, making the installation of the engineering anchors particularly time-consuming and labor-intensive.

[0007] Second, in the initial stage of anchor installation, the initial clamping lengths of the clamping plates in each anchor hole in the anchor plate are uneven, and the bearing values ​​of each single steel strand vary greatly: in the initial stage of installation, the clamping plates of each independent unit can only be hammered into the anchor hole manually with the help of tools such as hammers or wrenches. As for the depth of the locking plates, it all depends on the subjective feeling of the workers. The uneven initial penetration depth of the locking plates directly affects the uneven clamping force of the unit's locking plates in the later stage, resulting in asynchronous force in the later stage and large differences.

[0008] Third, when the engineering anchor is tensioned and locked, a limit plate needs to be installed on each anchor, which is time-consuming and labor-intensive: when the prestressed steel strand is tensioned, it must be on the top of the engineering anchor, and an auxiliary tool, the limit plate, must be installed between the anchor and the jack. Because the design parameters of the engineering anchors of each manufacturer are different, it is often difficult to make the limit plates universal and universal. Therefore, it is also time-consuming and labor-intensive to select and install the limit plates.

[0009] Fourth, when the steel strands of the prestressed bundle retract during tensioning and locking, the clamping pieces of each unit follow up asynchronously, the locking pieces slip, and the steel strands are unevenly stressed: Due to the high elastic elongation modulus shared by the prestressed steel strands, when the steel strand bundles in each anchor hole are under the action of the tensioning force of the jack, the steel strands in each anchor hole will produce a certain corresponding elongation length. Under the frictional resistance with the steel strands, the locking pieces in the anchor holes will also slide to the outside (large end) of the anchor holes as the steel strands elongate until they reach the top of the limit plate. This phenomenon is usually called the free travel of the locking piece, and the distance of the free travel is usually 4-8mm.

[0010] When the tensioning force of the steel strand reaches or slightly exceeds the design value, the tensioning is terminated immediately. Then the pressure in the jack hydraulic cylinder is released through a special valve, and the steel strand retracts. As the steel strand retracts, the locking plate is driven to lock the steel strand in the inverted cone anchor hole. This phenomenon is usually called: the follow-up of the locking plate. However, in some cases, when the steel strand retracts, its locking plate will not follow up immediately, or when multiple strands are tensioned at the same time, some locking plates will follow up, some will delay following up or will not follow up (slipping teeth). Then the steel strands are unevenly stressed, or some steel strands are not stressed at all. This phenomenon is a common problem of existing products.

[0011] Fifth, the prestress value applied during the tensioning operation is lost greatly: As mentioned in the fourth point: when the tensioning force of the steel strand reaches or slightly exceeds the design value, the tensioning is terminated immediately, and the locking piece cannot follow up in time. In the process of the locking piece following up, it is actually the process of releasing the stress in the steel strand - this phenomenon is also called the prestress loss of the locking piece. The shorter the steel strand, the more obvious this phenomenon is, and the more prestress loss it has. This phenomenon is also a common problem of existing products.

[0012] Sixth, the loss of prestress caused by anchors in engineering use: After the highway bridge or railway is tensioned, cement slurry needs to be injected into the previously reserved steel strand bundle holes in the beam. The anchors at both ends of the beam often need to be wrapped and poured with concrete, and cement slurry can easily enter the cone holes of the anchors at both ends of the beam. When cement slurry enters the cone holes of the anchors, some locking pieces are in a restrained state. During use, due to the dynamic load from the bridge deck, the prestressed bundles of the steel strands in the beam produce corresponding tension and relaxation repeated loads, causing the locking pieces to fail to follow up in time, reducing the anchoring force of the anchors and causing stress loss in the steel strands. Summary of the invention

[0013] The object of the present invention is to provide a low-stress-loss, low-retraction, self-locking anchor for prestressed steel strands of road bridges or railway bridges.

[0014] To achieve the above-mentioned purpose, the present invention provides a low-stress loss, low-retraction, self-locking anchor, comprising an anchor plate and a limit plate arranged on the outer wall of the anchor plate;

[0015] The anchor plate is provided with a plurality of inner conical holes, which are arranged regularly. A split-flange conical clip is arranged in the inner conical hole. The split-flange conical clip includes at least two claw-shaped locking pieces. The split-flange conical clip is provided with a synchronous adjustment structure. The synchronous adjustment structure synchronously pushes or leaves the clip to facilitate the movement of the steel strand. A follow-up spring is arranged on the outer side of the through-hole washer and is compressed by the follow-up spring.

[0016] A limit plate is also provided, which compresses the follow-up spring to push the split-flap conical clip into the inner conical hole, and the limit plate is fixedly installed on one side of the anchor plate.

[0017] The limiting plate is provided with a plurality of through holes for passing the anchoring steel strands, the number of the through holes is the same as the number of the tapered holes, and the layout positions of the plurality of through holes correspond one-to-one to the layout positions of the anchor holes.

[0018] Preferably, the synchronous adjustment structure uses a through-wax washer; the split-flank conical clip is provided with a through-wax washer facing the direction of the follow-up spring, the through-wax washer synchronously pushes or leaves the clip of the split-flank conical clip, and the outer side of the through-wax washer is compressed by a follow-up spring.

[0019] Preferably, the synchronous adjustment structure uses a through-hole positioning slider;

[0020] The claw-shaped locking piece is provided with a through-center positioning slider at the tail end facing the follow-up spring and is surrounded and fastened by the through-center positioning slider. The first groove of the tension spring is placed on the inner side of the claw-shaped locking piece near the through-center positioning slider. The outer side of the locking piece is provided with a second groove for placing the clamping spring towards the tail end of the follow-up spring. The tensioning spring can generate an outward tension assist when rotating the steel strand, so that the locking piece can be opened at the mouth.

[0021] The follow-up spring is pressed by the limit plate to tighten the through-center positioning slider.

[0022] Preferably, an adjustable pad is connected to the other side of the anchor plate, and the adjustable pad is rotatably connected to one side of the anchor plate through a thread;

[0023] The adjustable backing plate is provided with a through hole for the anchoring steel strand to pass through, and the inner diameter of the through hole is smaller than the outer diameter of the anchor plate.

[0024] Preferably, the adjustable pad is a circular body, and the adjustable pad is provided with a socket on the circular outer ring, and the socket is inserted into a detachable force rod to facilitate the rotation of the adjustable pad.

[0025] Preferably, a retreat block is provided at the bottom of the inner tapered hole facing the opening of the tapered clip, and the retreat block is made of a flexible material.

[0026] Preferably, the retreat block is arranged to fit the inner wall of the inner tapered hole, and a through hole is reserved for passing the steel strand. One side of the retreat block abuts against the small end of the split-flange conical clamp, and the other side is embedded in the straight end hole of the anchor plate. The retreat block retreats or makes way for the split-flange conical clamp when the steel strand is tensioned, locked and injected with cement slurry and subjected to repeated loads, or when the load is increased a second time in actual use, to prevent the split-flange conical clamp from being in a restrained state and being wrapped in concrete, making it impossible to follow up in time for a second time.

[0027] Preferably, a limiting cavity is provided at one end of the limiting plate facing the follow-up spring, and a limiting base is provided at one end of the limiting plate deviating from the follow-up spring for supporting or clamping the follow-up spring; one end of the limiting cavity is connected to the inner conical hole to form a petal-type conical clip and an active chamber of the follow-up spring.

[0028] Preferably, a sealing ring is provided at the limiting base, and each unit sealing ring is tightly bound to the outer periphery of each single steel strand to seal the movable chamber.

[0029] Preferably, the sealing ring at the limit pedestal can be installed after each steel strand is tensioned and locked.

[0030] Preferably, the split-flap conical clip is formed by 2-4 claw-shaped locking pieces, and the split-flap conical clip is formed by combining the claw-shaped locking pieces into a truncated cone shape, and a through hole is reserved inside the clip for passing the anchoring steel strand;

[0031] Alternatively, the tapered holes are evenly distributed on the anchor plate.

[0032] Preferably, the tapered holes are arranged in a circular ring shape on the end surface of the anchor plate.

[0033] Preferably, the tapered hole is arranged in a flat shape on the end surface of the anchor plate.

[0034] Preferably, the end surface of the anchor plate is round, which is usually called a round anchor.

[0035] Preferably, the end face of the anchor plate is square, which is usually called a flat anchor.

[0036] The beneficial effects of the present invention are:

[0037] First, the anchor of the present invention can be pushed along one end of the steel strand to lock itself during construction and installation, which is convenient, quick, time-saving and labor-saving. The locking (clip) piece will not slip or fall off due to the installation of the anchor on one side and the anchor on the other side.

[0038] Secondly, the anchor of the present invention achieves compensation for stress loss when the steel strands are tensioned and locked by adjusting the distance between the adjustable pad and the anchor plate, thereby reducing the stress loss to a minimum.

[0039] Third, the anchor of the present invention can effectively absorb the stress increase and decrease caused by repeated loads and prevent the stress loss of the steel strand caused by repeated loads;

[0040] Fourthly, when the steel strand is tensioned and locked, the split-flange conical clips in the conical hole of the anchor of the present invention follow up promptly and synchronously, the stress loss of the locked steel strand is small, the steel strand is evenly stressed, and the overall anchoring efficiency of the anchor is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic diagram of the structure of Example 1;

[0042] Figure 2 is a schematic structural diagram of the adjustable pad of Example 1;

[0043] Figure 3 yes Figure 2 AA cross-sectional view;

[0044] Figure 4 yes Figure 2 A cross-sectional view along the BB direction;

[0045] Figure 5 is a schematic diagram of the anchor plate structure of Example 1;

[0046] Figure 6 yes Figure 5 The cross-sectional view along CC direction;

[0047] Figure 7 is a schematic structural diagram of the limiting plate of Example 1;

[0048] Figure 8 yes Figure 7 DD-direction cross-sectional view;

[0049] Fig. 9is a schematic structural diagram of a split-flap tapered clip 10 of Example 1;

[0050] Fig.10 yes Fig. 9 EE-direction cross-sectional view;

[0051] Fig.11 This is a schematic diagram of the installation of the anchor of the present invention before tensioning and locking;

[0052] Fig.12 1 is a schematic diagram of the installation of the anchor of the present invention after tensioning and locking;

[0053] Fig.13 is a schematic structural diagram of Example 2;

[0054] Fig.14 is a structural schematic diagram of a through-hole positioning slider of Example 2;

[0055] Fig.15 is a schematic structural diagram of a split-petal tapered clip of Example 2;

[0056] Fig.16 yes Fig.15 FF-direction cross-sectional view;

[0057] Fig.17 is a schematic structural diagram of Example 3;

[0058] Fig.18 is a schematic diagram of the anchor plate structure of Example 3;

[0059] Fig.19 is a side view of Example 3;

[0060] Fig. 20 is a schematic structural diagram of Example 4;

[0061] Fig.21 is a schematic diagram of the anchor plate structure of Example 4;

[0062] Fig. 22 yes Fig.21 B'-B' sectional view;

[0063] Among them, there are an adjustable pad 1; a socket 101; a through hole 102; a detachable force rod 13; an anchor plate 2; a limit plate 3; a limit cavity 31; a limit base 32; a sealing gasket 33; a follow-up spring 4; an inner tapered hole 21; a synchronous adjustment structure 6; a through gasket 61; a through positioning slider 62; a tension spring 631; a first groove 632; a retaining spring 641; a second groove 642; a retreat block 9; a split-flange conical clip 10; and a steel strand 11. DETAILED DESCRIPTION

[0064] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0065] Example 1

[0066] like Figure 1-11 As shown, a low-stress loss, low-retraction, self-locking anchor of the present embodiment includes an anchor plate 2 and a limit plate 3 arranged on one side of the anchor plate 2, and the limit plate 3 is fixedly mounted on the outer wall of the anchor plate 2 so that the position of the split-petal conical clip 10 can move within a specific range.

[0067] The anchor plate 2 is provided with 7 inner conical holes 21, each of which is regularly arranged. A split-flange conical clip 10 is provided in the inner conical hole 21. The split-flange conical clip 10 includes at least two claw-shaped locking pieces. The split-flange conical clip 10 is provided with a synchronous adjustment structure 6. The synchronous adjustment structure 6 synchronously pushes or leaves the clip to facilitate the movement of the steel strand. A follow-up spring 4 is provided on the outer side of the through-hole washer 6 and is pressed by the follow-up spring 4.

[0068] A limit plate 3 is also provided, and the limit plate 3 is provided with a limit seat 32 to fix and press the follow-up spring 4 to push the split-flange conical clip 10 into the inner conical hole 21, and the limit plate 3 is fixedly installed on one side of the anchor plate.

[0069] The split-flap conical clip 10 is provided with a through-washer 61 facing the follow-up spring, and the through-washer 61 synchronously pushes or leaves the clip of the split-flap conical clip 10, and the outer side of the through-washer 61 is pressed by a follow-up spring 4. The through-washer 61 is arranged close to the split-flap conical clip 10, and when the steel strand 11 is pushed forward or withdrawn, the split-flap conical clip 10 is subjected to force synchronously, and each claw-type locking piece can be advanced or retreated synchronously with the through-washer 61, so that each split-flap conical clip 10 is hammered into the conical hole 21 to the same depth, so that its clamping force on the steel strand is uniform and has less discreteness.

[0070] like Fig.11 As shown, when the end of the steel strand 11A is inserted from the small end of the split cone clamp 10, the end of the steel strand 11A pushes the split cone clamp 10 toward the end of the limit plate 3, and then the follow-up spring 4 is elastically compressed, and then the split cone clamp 10 retreats, and the teeth of the small end of the split cone clamp 10 open, and the steel strand 11A can only be freely threaded in one direction. When the thrust value of the steel strand 11A end is zero or it is pulled in the opposite direction, the split cone clamp 10 is pushed by the follow-up spring 4 to realize that the end of the steel strand 11A is automatically locked.

[0071] like Fig.12As shown, after the stress-low loss, low retraction, self-locking anchorage at the end of the steel strand 11A is installed and fixed, the ends of the steel strand 11B are respectively inserted into the corresponding inner tapered holes 21. Then the anchorage is pushed from the end of the steel strand 11B to the end of the steel strand 11A, and then the anchorage at the B end is automatically locked and installed with the end of the steel strand 11B. Fig.11 A-end installation.

[0072] Furthermore, when the anchor at the B end of the plate beam or cap beam pushes the steel strand 11B end to the steel strand 11A end, the steel strand 11 itself will also slide toward the steel strand 11A end, and then push the split-flange tapered clip 10 of the anchor at the A end of the plate beam or cap beam to move toward the large end of the inner tapered hole 21. However, when the thrust from the B end of the anchor decreases or disappears, the follow-up spring 4 at the A end of the plate beam or cap beam immediately presses the outward movement of the split-flange tapered clip 10 with its rebound force and resets and automatically locks. Unlike other anchors, the locking piece will not slide and fail to follow or fall off.

[0073] In summary, the sawing effect that occurs when installing the anchors on both sides is avoided, and the installation efficiency of the anchors is improved. In the sawing effect, the problem of direct prestress loss is also alleviated, and the anchoring force of the anchor is improved.

[0074] An adjustable pad 1 is connected to the other side of the anchor plate 2, and the adjustable pad 1 is connected to one side of the anchor plate 2 by threaded rotation; the adjustable pad 1 is provided with a through hole for the anchoring steel strand 11 to pass through, and the steel strand passes through the anchor plate and the through hole 102, and the adjustable pad 1 is connected to one side of the anchor plate 2 by threaded rotation, and the tension locking force on the steel strand is adjusted by adjusting the threaded engagement length of the adjustable pad 1 and the anchor plate 2.

[0075] The adjustable pad 1 and the anchor plate 2 are coaxially arranged, so that the force acting on the steel strands when being tensioned is more uniform and stable.

[0076] The through hole 102 provided on the adjustable backing plate 1 can accommodate a plurality of steel strands provided on the anchor plate 2 to rotate in a circular motion along the axis of the through hole.

[0077] The adjustable backing plate 1 is a circular body, and a socket 101 is arranged on the circular outer ring of the adjustable backing plate 1 . The socket 101 is inserted with a detachable force rod 13 to facilitate the rotation of the adjustable backing plate 1 .

[0078] In the prior art, the pad is fixedly mounted on the anchor plate 2 to support the anchor plate, and has no other functions. The adjustable pad 1 in the present invention is connected to the anchor plate 2 by threads, and the overall length of the adjustable pad 1 after the connection with the anchor plate 2 is adjusted by rotating the threads to adjust the tension of the anchor on the steel strand. The steel strand 11 can be slightly pulled or slightly released by rotating the adjustable pad, thereby adjusting the prestress of the steel strand.

[0079] The adjustable backing plate 1 is a circular body, and a socket 101 is arranged on the circular outer ring of the adjustable backing plate 1 . The socket 101 is inserted with a detachable force rod 13 to facilitate the rotation of the adjustable backing plate 1 .

[0080] The inner conical hole 21 is provided with a retreat block 9 at the bottom facing the opening of the conical clip, and the retreat block 9 is used to tightly support the split-flange conical clip 10; the retreat block 9 is made of flexible material to prevent the conical clip 10 from being in a restrained state after the small end of the inner conical hole 21 enters the cement slurry, for example, it cannot be followed up again in time when it is wrapped by concrete.

[0081] Furthermore, when repeated dynamic loads from the road surface are detected, the retreat block 9 can provide space (retreat) for the secondary (re) follow-up of the conical clip 10, which can effectively reduce the loss of prestress of the steel strand caused by fatigue load of the anchor.

[0082] The retreat block 9 is arranged to fit the inner wall of the inner tapered hole 21 , and a through hole is reserved for passing the steel strand 11 , which cooperates with the steel strand 11 to block the tapered hole, and can cooperate with the flexible filling body or anti-corrosion material filled in the sealed inner tapered hole 21 .

[0083] The end of the limit plate 3 facing the follow-up spring 4 is provided with a limit cavity 31, and the end of the limit plate 3 away from the follow-up spring 4 is provided with a limit seat 32 for supporting the follow-up spring 4; one end of the limit cavity 31 is connected to the inner conical hole 21 to form an anchor hole of the split-flange conical clip 10 and an active chamber of the follow-up spring 4. The limit plate 3 is fixedly connected to the anchor plate 2 by bolts. The limit plate 3 in the present invention is fixedly installed on the anchor plate 2, which saves the process of selecting and installing the limit plate, and also greatly reduces the stress loss in the use of the engineering anchor.

[0084] The limiting seat 32 is provided with a sealing gasket 33 to press against the follow-up spring 4 and is bound to the outer circle of the steel strand 11 to seal the movable chamber, and is used to cooperate with the filling body or anti-corrosion material filled in the sealed inner limiting cavity 31.

[0085] The split-flap conical clip 10 is formed by 2-4 claw-shaped locking pieces. The split-flap conical clip 10 is formed by combining the claw-shaped locking pieces into a truncated cone shape, and a through hole is reserved inside the clip for passing the anchoring steel strand 11.

[0086] In this structure, the plurality of tapered holes are evenly arranged, and the plurality of tapered holes are symmetrically arranged with the longitudinal center line of the anchor plate 2 as the symmetry line.

[0087] The low-stress loss, low-retraction, self-locking anchor of the present invention has a simple structure, is easy to install the steel strand, has no slipping, retreating, or falling-off of the claw-shaped locking piece, and can be adjusted in both directions, which greatly improves the construction efficiency; each of the split-petal conical clamping pieces 10 follows up synchronously and has an effective clamping length for the steel strand that is substantially equal, so that the clamping force for the steel strand is uniform and synchronous, with less discreteness, which greatly improves the overall anchoring efficiency of the anchor; can effectively compensate for the stress loss of the steel strand caused by tensioning and locking; can effectively prevent the loss of prestress of the steel strand caused by repeated loading of the anchor during use of the engineering anchor; can ensure the long-term and effective anchoring stability of the anchor;

[0088] Example 2

[0089] like Figure 12-16 As shown, a low-stress loss, low-retraction, self-locking anchor of the present invention, the synchronous adjustment structure 6 of the locking plate is different from that of Example 1. Among them, the claw-shaped locking plate is provided with a through-center positioning slider 62 at the tail end facing the follow-up spring and is surrounded and tightened by it, and a first groove 632 for placing a tension spring 631 is provided on the inner side of the claw-shaped locking plate near the through-center positioning slider, and a second groove 642 for placing a clamping spring 641 is provided on the outer side of the locking plate towards the tail end of the follow-up spring. The tension spring 631 can generate an outward tension assist when rotating the steel strand, so that the locking plate can be opened at the mouth;

[0090] The follow-up spring 4 is pressed by the limiting plate 3 to press against the through-center positioning slider 61 .

[0091] The synchronization of the split-petal conical clamp 10 is achieved by the cooperation between the through-center positioning slider 61 and the retaining spring 641, so as to solve the problems of uneven clamping force and loss of prestress.

[0092] The design of the tension spring 631 helps to move the steel strand in the hole of the split-flange conical clamp 10 by pushing each claw-type locking piece outward.

[0093] The other structures of this embodiment are the same as those of Embodiment 1 and will not be described in detail here.

[0094] Example 3

[0095] like Figure 17-19 As shown, the anchor plate 2 of the present invention is square in shape, and no adjustable pad is provided on the inner side of the anchor plate 2 .

[0096] The other structures of this embodiment are the same as those of Embodiment 1 and will not be described in detail here.

[0097] Example 4

[0098] like Figure 20-Figure 22 As shown, the anchor plate 2 of the present invention is square in shape, and no adjustable pad is provided on the inner side of the anchor plate 2 .

[0099] The other structures of this embodiment are the same as those of Embodiment 2 and will not be described in detail here.

[0100] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable technicians in this field to understand the content of this patent and implement it accordingly. The scope of protection of this patent cannot be limited by this embodiment alone. That is, any equivalent changes or modifications made according to the spirit disclosed by this patent still fall within the scope of protection of this patent.

Claims

1. A low stress loss, low retraction, self-locking anchor, characterized by: It includes an anchor plate and a limiting plate arranged on the outer wall of the anchor plate; The anchor plate is provided with at least two inner conical holes, and a split-flange conical clip is arranged in the inner conical holes, and the split-flange conical clip includes at least two claw-shaped locking pieces, and the split-flange conical clip is provided with a synchronous adjustment structure, and the synchronous adjustment structure synchronously pushes or leaves the clip to facilitate the movement of the steel strand, and a follow-up spring is arranged on the outer side of the synchronous adjustment structure, and the split-flange conical clip is elastically pressed by the follow-up spring; A limit plate is also provided, the limit plate presses the follow-up spring to push the split-flap conical clip into the inner conical hole, and the limit plate is fixedly installed on one side of the anchor plate; The other side of the anchor plate is connected to an adjustable pad, and the adjustable pad is rotatably connected to one side of the anchor plate through a thread; The adjustable pad is provided with corresponding through holes for a plurality of anchoring steel strands to pass through, and the center line of the through hole of the adjustable pad is on the same axis as the center line of the anchor plate; The synchronous adjustment structure uses a through-hole positioning slider; The claw-shaped locking piece is provided with a through-center positioning slider at the tail end facing the follow-up spring and is surrounded and fastened by the through-center positioning slider. The first groove of the tension spring is placed on the inner side of the claw-shaped locking piece near the through-center positioning slider. The outer side of the locking piece is provided with a second groove for placing the clamping spring towards the tail end of the follow-up spring. The tensioning spring can generate an outward tension assist when rotating the steel strand, so that the locking piece can be opened at the mouth. The follow-up spring is pressed by the limit plate to tighten the through-center positioning slider.

2. The low stress loss, low retraction, self-locking anchor according to claim 1, characterized in that: A limit plate is fixedly installed on one side of the anchor plate, and a plurality of through holes are correspondingly opened on the limit plate for the anchoring steel strands to pass through. The number of the through holes is the same as the number of the tapered holes, and the layout positions of the plurality of through holes correspond one by one to the layout positions of the plurality of anchor holes, and are respectively located on the same corresponding axis.

3. The low stress loss, low retraction, self-locking anchor according to claim 1, characterized in that: The adjustable pad is a circular body, and a socket is arranged on the circular outer ring of the adjustable pad. The socket is inserted with a detachable force rod to facilitate the rotation of the adjustable pad.

4. The low stress loss, low retraction, self-locking anchor according to claim 1, characterized in that: The inner conical hole is provided with a retreat block at the bottom facing the opening of the conical clip, and the retreat block can support the split-petal conical clip to buffer stress; the retreat block is made of flexible material.

5. The low stress loss, low retraction, self-locking anchor as claimed in claim 4, characterized in that: The retreat block is arranged to fit the inner wall of the inner tapered hole, and a through hole is reserved for passing the steel strand, so as to cooperate with the steel strand to block the tapered hole.

6. The low stress loss, low retraction, self-locking anchor according to any one of claims 1, 2 and 4, characterized in that: A limiting cavity is provided at one end of the limiting plate facing the follow-up spring, and a limiting seat is provided at one end of the limiting plate deviating from the follow-up spring for supporting the follow-up spring; one end of the limiting cavity is connected to the inner conical hole to form a split-petal conical clip and an active chamber of the follow-up spring.

7. The low stress loss, low retraction, self-locking anchor according to claim 6, characterized in that: The split-petal conical clamp is formed by 2-4 claw-shaped locking pieces. The split-petal conical clamp is formed by combining the claw-shaped locking pieces into a truncated cone shape, and a through hole is reserved inside the clamp for passing the anchoring steel strand.

8. The low stress loss, low retraction, self-locking anchor as claimed in claim 2, characterized in that: The plurality of tapered holes are evenly arranged on the end surface of the anchor plate, and two tapered holes located on the left and right sides of the plurality of tapered holes are symmetrically arranged with the longitudinal center line of the anchor plate as the symmetry line.

9. The low stress loss, low retraction, self-locking anchor according to claim 6, characterized in that: The limiting pedestal is provided with a sealing gasket to press against the follow-up spring, and the inner hole wall of the sealing gasket is tightly bound to the periphery of the steel strand to seal the movable chamber.

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