CN110565545A - stress low-loss, low-retraction and self-locking anchorage device - Google Patents
stress low-loss, low-retraction and self-locking anchorage device Download PDFInfo
- Publication number
- CN110565545A CN110565545A CN201910774891.9A CN201910774891A CN110565545A CN 110565545 A CN110565545 A CN 110565545A CN 201910774891 A CN201910774891 A CN 201910774891A CN 110565545 A CN110565545 A CN 110565545A
- Authority
- CN
- China
- Prior art keywords
- plate
- low
- anchor
- spring
- locking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 93
- 239000010959 steel Substances 0.000 claims abstract description 93
- 230000001360 synchronised effect Effects 0.000 claims abstract description 15
- 230000033001 locomotion Effects 0.000 claims abstract description 7
- 238000004873 anchoring Methods 0.000 claims description 15
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 230000035515 penetration Effects 0.000 claims 1
- 238000004080 punching Methods 0.000 claims 1
- 238000009434 installation Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 239000004567 concrete Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000002787 reinforcement Effects 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 210000002435 tendon Anatomy 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011513 prestressed concrete Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/12—Anchoring devices
- E04C5/122—Anchoring devices the tensile members are anchored by wedge-action
Abstract
the invention discloses a self-locking anchorage device with low stress loss and low retraction, which comprises an anchor plate and a limiting plate arranged on the outer wall of the anchor plate; the anchor plate is provided with a plurality of inner cone holes which are regularly distributed, split type conical clamping pieces are arranged in the inner cone holes and at least comprise two claw-shaped locking plates, the split type conical clamping pieces are provided with synchronous adjusting structures, the synchronous adjusting structures synchronously push or leave the clamping pieces to facilitate the movement of the steel strand, and the outer side of the piercing washer is provided with a following spring and is pressed tightly through the following spring; the anchor plate is characterized in that a limiting plate is further arranged, the limiting plate compresses a follow-up spring to push the split type conical clamping piece to be in the inner conical hole, and the limiting plate is fixedly installed on one side of the anchor plate. The invention provides an anchorage device with low stress loss, low retraction and self-locking for prestressed steel strands of road bridges or railway bridges.
Description
Technical Field
the invention relates to an anchorage device for a highway bridge or a railway bridge, in particular to a self-locking anchorage device with low stress loss and retraction.
background
the prestressed concrete assembled hollow slab bridge is a main bridge type of highway or railway bridges in China, and is widely applied to medium and small-span highway bridges. With the influence of a plurality of adverse factors such as rapid increase of traffic volume, vehicle overrun and the like, the existing hollow slab bridge needs to be reinforced during installation or maintenance. The existing common reinforcement mode is external prestress reinforcement, the bearing capacity of the bridge is improved by tensioning external prestress tendons in a tension area of the bridge, the basic principle is that the compressive property of concrete is fully utilized, the external prestress tendons apply prestress on a beam body, and the internal force generated by partial external load is offset by the bending moment generated by the prestress, so that the purposes of improving the structural use performance and improving the ultimate bearing capacity are achieved.
Whether external prestress reinforcement can achieve an expected reinforcement effect or not is closely related to anchoring of external prestress, and for a prestressed concrete assembled hollow slab bridge, the existing anchoring structure and process of external prestress reinforcement is to install prestressed tendons such as steel strands and the like in outer side wall concrete of two side plates at two sides of the hollow slab bridge, then install a prestressed anchorage at one side, and then install an anchorage at the other side, stretch the external prestressed tendons and the like.
In the existing working condition, a steel strand stress beam is penetrated after a hollow pipeline is pre-embedded in a bent cap above a pier, then anchor backing plates (bearing plates) at two ends and a prestressed anchor are installed, then an external prestressed beam is tensioned, and then locking is carried out. The anchor backing plate below the prestressed anchorage device is usually made of iron castings and is vertically and symmetrically arranged at two ends, namely two ends, along the plate girder or the bent cap.
although the existing anchoring system is installed and constructed quickly, the following problems still exist in the installation and construction:
firstly, the engineering anchorage is difficult to be in place at one time when the anchorage at two ends of a plate beam or a bent cap is installed: when the anchorage device is installed, the clamping piece in each anchor plate hole, also called clamping piece or locking piece or clamping piece, is often installed in place at one end and retreats at the other end, namely, the clamping piece at the other end slides or falls off towards the outside of the anchor hole of the anchorage device under the pushing of the equidirectional force of the steel strand at one side, and then the sawing effect appears, so that the installation of the engineering anchorage device is particularly time-consuming and labor-consuming.
Secondly, the initial clamping length of the clamping piece in each anchor hole in the anchor plate at the initial stage of anchor installation is not uniform, and the difference of the bearing value of each single steel strand is large: the clamping piece of each independent unit can only pound the locking plate into the anchor hole with the help of tools such as hammer or wrench handle for the artificial at the initial stage of installation, and the degree of depth of pounding into as for the locking plate is totally by workman's subjective sensation, and the inhomogeneous then the clamping-force that directly influences this unit locking plate later stage of pounding into the degree of depth in earlier stage of its locking plate is inhomogeneous to lead to its later stage atress asynchronous, the difference is great.
Third, all need install the limiting plate on its each ground tackle when engineering ground tackle stretch-draw, locking, consuming time power: when the prestressed steel strand is tensioned, an auxiliary tool, namely a limiting plate, is required to be arranged on the engineering anchorage device, and an auxiliary tool, namely the limiting plate, is arranged between the anchorage device and the jack. Therefore, it is also necessary to select and install the position-limiting plate with time and labor.
Fourthly, when each steel strand retracts in the tension lock, each unit clamping piece follows up asynchronously, the locking piece slides, and the stress of the steel strand is uneven: because the total high elastic elongation modulus of prestressing force steel strand wires, under the effect of jack tension force as the steel strand wires in each anchor eye, the steel strand wires all can produce the extension length of certain corresponding value in its each anchor eye, and the locking plate in its anchor eye also can slide toward the outside (the main aspects) of anchor eye along with the extension of its steel strand wires under the frictional resistance with the steel strand wires, until the top of reacing the limiting plate, this phenomenon is generally known as: the free travel of the locking tab, the distance of which is typically 4-8 mm.
and when the tension value of the steel strand reaches or slightly exceeds the design value, the tension is terminated immediately. Then release the pressure in the jack pneumatic cylinder through purpose-made valve, and then the steel strand wires retract, drive the locking plate and lock the steel strand wires in the anchor eye of back taper when the steel strand wires retract, and this phenomenon is generally called: and (5) following the lock plate. However, in some cases, the locking plate does not follow the steel strand at once while the steel strand is retracted or partial locking plate follow-up occurs while the steel strand is stretched simultaneously, and partial locking plate follow-up is delayed or does not follow-up (sliding teeth). And then the stress of the steel strand is not uniform, or part of the steel strand is not stressed at all. This phenomenon is a common problem of the existing products.
Fifthly, the loss of the applied prestress value is large during the stretching operation: as described in the fourth paragraph: when the tension value of the steel strand reaches or slightly exceeds the design value, the tension is stopped immediately, and the locking plate cannot follow up in time. In the following process of the locking plate, the release process of the internal stress of the steel strand is actually the release process, and the phenomenon is called the prestress loss of the locking plate. The phenomenon is more obvious when the steel strand is shorter, and the prestress loss is more obvious. This phenomenon is also a common problem with existing products.
Sixthly, the prestress loss generated in the engineering use of the anchorage device is as follows: the method is characterized in that cement slurry needs to be injected into steel strand penetrating holes reserved in the beams of highway bridges or railways after tensioning, anchors at two ends of the beams often need to be wrapped and poured by concrete, and the cement slurry easily enters into anchor conical holes at two ends of the beams. When the anchor is in a confined state after entering the cement slurry in the tapered hole, the dynamic load from the bridge deck causes the steel strand prestress beam in the beam to generate corresponding tension and relaxation repeated loads, so that the locking plate can not follow up in time, the anchoring force of the anchor is reduced, and the stress loss of the steel strand is caused.
disclosure of Invention
The invention aims to provide a stress low-loss, low-retraction and self-locking anchorage device for prestressed steel strands of road bridges or railway bridges.
in order to achieve the purpose, the self-locking anchorage device with low stress loss and low retraction comprises an anchor plate and a limiting plate arranged on the outer wall of the anchor plate;
the anchor plate is provided with a plurality of inner cone holes which are regularly distributed, split type conical clamping pieces are arranged in the inner cone holes and at least comprise two claw-shaped locking plates, the split type conical clamping pieces are provided with synchronous adjusting structures, the synchronous adjusting structures synchronously push or leave the clamping pieces to facilitate the movement of the steel strand, and the outer side of the piercing washer is provided with a following spring and is pressed tightly through the following spring;
The anchor plate is characterized in that a limiting plate is further arranged, the limiting plate compresses a follow-up spring to push the split type conical clamping piece to be in the inner conical hole, and the limiting plate is fixedly installed on one side of the anchor plate.
The limiting plate is correspondingly provided with a plurality of through holes for the anchoring steel strands to pass through, the number of the through holes is the same as that of the conical holes, and the arrangement positions of the through holes are in one-to-one correspondence with the arrangement positions of the anchor holes respectively.
Preferably, the synchronous adjusting structure is a piercing washer; the split type conical clamping piece is provided with a piercing gasket towards the direction of the follow-up spring, the piercing gasket synchronously pushes or leaves the clamping piece of the split type conical clamping piece, and the outer side of the piercing gasket is pressed tightly by the follow-up spring.
preferably, the synchronous adjusting structure adopts a center-penetrating positioning slide block;
The claw-shaped locking plate is provided with a piercing positioning slide block at the tail end facing the follow-up spring and is surrounded and fastened by the piercing positioning slide block, a first groove for placing a tension spring is arranged at the position, close to the piercing positioning slide block, of the inner side of the claw-shaped locking plate, the outer side of the locking plate is provided with a second groove for placing a clamp spring at the tail end facing the follow-up spring, and the tension spring can generate an outward-stretching assisting force when a steel strand is rotated, so that the locking plate can be opened at the opening part;
The follow-up spring is pressed by the limiting plate to push the piercing positioning slide block tightly.
preferably, the other side of the anchor plate is connected with an adjustable base plate, and the adjustable base plate is rotatably connected to one side of the anchor plate through threads;
the adjustable base plate is provided with a through hole for the steel strand for anchoring to pass through, and the inner diameter of the through hole is smaller than the outer diameter of the anchor plate.
Preferably, the adjustable base plate is a circular body, the adjustable base plate is provided with a jack on a circular outer ring, and the jack is inserted into the detachable stressing rod so as to conveniently rotate the adjustable base plate.
Preferably, the inner taper hole is provided with a position retreating block at the bottom of the opening part of the tapered clamping piece, and the position retreating block is made of flexible materials.
As preferred, retreat the setting of the interior taper hole inner wall of piece laminating to a through-hole has been reserved and has been used for passing steel strand wires, retreat one side of piece and the tip butt of split type toper clamping piece, the opposite side is inlayed in the straight termination hole of anchor slab, retreat the piece and do the retreat or give way for split type toper clamping piece when steel strand wires stretch-draw locking and the repeated load after pouring into grout or during the in-service secondary increase load, prevent that split type toper clamping piece is in the confined state concrete parcel and can't follow up in time the secondary.
Preferably, a limiting cavity is arranged at one end, facing the follow-up spring, of the limiting plate, and a limiting pedestal is arranged at one end, deviating from the follow-up spring, of the limiting plate and used for supporting or clamping the follow-up spring; one end of the limiting cavity is communicated with the inner taper hole to form a movable cavity of the split type conical clamping piece and the follow-up spring.
preferably, the limiting pedestal is provided with a sealing ring, and each unit sealing ring is tightly bound to the periphery of each single steel strand so as to seal the movable chamber.
Preferably, the sealing ring at the position of the limiting pedestal can be installed after each steel strand is tensioned and locked.
preferably, the split type conical clamping piece is formed by encircling 2-4 claw-shaped locking plates, the split type conical clamping piece is in a cone frustum shape after being combined by the claw-shaped locking plates, and a through hole is reserved in the split type conical clamping piece and used for penetrating through the steel strand for anchoring;
Or the conical holes are uniformly distributed on the anchor plate.
preferably, the tapered holes are arranged on the end face of the anchor plate in a circular ring shape.
preferably, the tapered holes are arranged on the end face of the anchor plate in a flat shape.
preferably, the end surface of the anchor plate is circular, i.e. commonly referred to as a round anchor.
Preferably, the end faces of the anchor plate are square, i.e. commonly referred to as flat anchors.
The invention has the beneficial effects that:
Firstly, the anchorage device can be pushed to be self-locked along one end of the steel strand during construction and installation, and is convenient, rapid, time-saving and labor-saving. The phenomena of sliding and falling off of the locking (clamping) piece can not occur when the anchorage device at one side is installed and the anchorage device at the other side is installed.
Secondly, the anchorage device realizes the compensation of the stress loss when the steel strand is tensioned and locked by adjusting the distance between the adjustable base plate and the anchor plate, thereby reducing the stress loss to the minimum.
thirdly, the anchorage device can effectively digest stress increase and decrease caused by repeated loads and prevent stress loss of the steel strand caused by the repeated loads;
fourthly, when the steel strand is tensioned and locked, the split type conical clamping pieces in the conical holes of the anchorage device are timely and synchronously tracked, the stress loss of the locked steel strand is small, the stress of the steel strand is uniform, and the overall anchoring efficiency of the anchorage device is greatly improved.
drawings
FIG. 1 is a schematic structural view of example 1;
FIG. 2 is a schematic view showing the structure of an adjustable mat according to embodiment 1;
3 FIG. 33 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 FIG. 32 3; 3
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;
FIG. 5 is a schematic view of the structure of an anchor plate according to example 1;
FIG. 6 is a cross-sectional view taken along line C-C of FIG. 5;
Fig. 7 is a schematic structural view of a stopper plate of embodiment 1;
FIG. 8 is a cross-sectional view taken along line D-D of FIG. 7;
Fig. 9 is a schematic structural view of the split tapered clip 10 of embodiment 1;
FIG. 10 is a cross-sectional view taken along line E-E of FIG. 9;
FIG. 11 is a schematic view of the anchor of the present invention installed prior to locking in tension;
FIG. 12 is a schematic view of the installation of the anchor of the present invention after it has been tensioned and locked;
FIG. 13 is a schematic structural view of embodiment 2;
FIG. 14 is a schematic structural view of a piercing positioning slider according to embodiment 2;
Fig. 15 is a schematic structural view of the split tapered clip of embodiment 2;
FIG. 16 is a sectional view taken along line F-F of FIG. 15;
FIG. 17 is a schematic structural view of embodiment 3;
FIG. 18 is a schematic view of the structure of an anchor plate according to example 3;
FIG. 19 is a side view of embodiment 3;
FIG. 20 is a schematic structural view of example 4;
FIG. 21 is a schematic view showing the structure of an anchor plate according to embodiment 4;
FIG. 22 is a sectional view taken along line B '-B' of FIG. 21;
Wherein, the base plate 1 can be adjusted; a jack 101; a through-hole 102; a detachable stress application rod 13; an anchor plate 2; a limiting plate 3; a limiting cavity 31; a limit pedestal 32; a sealing gasket 33; follow-up spring 4; an inner tapered bore 21; a synchronization regulation structure 6; a piercing washer 61; a piercing positioning slide block 62; a tension spring 631; a first recess 632; a snap spring 641; a second groove 642; a bit backing block 9; a split conical clip 10; the steel strands 11.
Detailed Description
the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example 1
as shown in fig. 1 to 11, the self-locking anchor with low stress loss and low retraction according to the present embodiment includes an anchor plate 2 and a limiting plate 3 disposed on one side of the anchor plate 2, wherein the limiting plate 3 is fixedly mounted on an outer wall of the anchor plate 2, so that the split type tapered clamping piece 10 moves within a specific range.
The anchor plate 2 is provided with 7 inner conical holes 21, each inner conical hole is regularly distributed, split type conical clamping pieces 10 are arranged in the inner conical holes 21, each split type conical clamping piece 10 at least comprises two claw-shaped locking pieces, each split type conical clamping piece 10 is provided with a synchronous adjusting structure 6, each synchronous adjusting structure 6 synchronously pushes or leaves the corresponding clamping piece to facilitate movement of a steel strand, and the outer side of the through washer 6 is provided with a follow-up spring 4 and is pressed tightly through the follow-up spring 4;
Still be equipped with limiting plate 3, limiting plate 3 is equipped with that spacing pedestal 32 is fixed and compress tightly follow-up spring 4 in order to promote split type toper clamping piece 10 in interior taper hole 21, just limiting plate 3 fixed mounting is in anchor slab one side.
the split type conical clamping piece 10 is provided with a piercing washer 61 towards the direction of the follow-up spring, the piercing washer 61 synchronously pushes or leaves the clamping piece of the split type conical clamping piece 10, and the outer side of the piercing washer 61 is pressed by the follow-up spring 4. The through washer 61 is arranged close to the split type conical clamping piece 10, when the steel strand 11 is pushed or withdrawn, the split type conical clamping pieces 10 are stressed synchronously, each claw-shaped locking piece can be enabled to advance or retreat and can be synchronized along with the through washer 61, and therefore the depth of each split type conical clamping piece 10 smashing into the conical hole 21 is the same, the clamping force of the split type conical clamping pieces on the steel strand is uniform, and the discreteness is small.
As shown in fig. 11, when the steel strand 11A end is inserted from the small-mouth end of the split conical clamping piece 10, the steel strand 11A end pushes the split conical clamping piece 10 to advance toward the limiting plate 3 end, then the spring 4 is followed to perform elastic compression, then the split conical clamping piece 10 moves back, the teeth at the small-mouth end of the split conical clamping piece 10 are opened, and the steel strand 11A end can only be freely threaded in a single direction. When the thrust value of the end of the steel strand 11A is zero or the steel strand 11A is pulled reversely, the split conical clamping piece 10 realizes that the end of the steel strand 11A is automatically locked under the pushing of the following spring 4.
As shown in FIG. 12, the stress low loss, low shrinkage, self-locking anchorage at the end of the steel strand 11A (after installation and fixation, the ends of the steel strand 11B are inserted into the corresponding holes of the respective inner taper holes 21. the anchorage is then pushed integrally from the end of the steel strand 11B to the end of the steel strand 11A, and then the anchorage at the end B and the end of the steel strand 11B are automatically locked and installed as shown in FIG. 11A.
and when the anchorage at the B end of the plate beam or the capping beam is pushed to the A end of the steel strand 11 from the B end of the steel strand 11, the steel strand 11 per se slides to the A end of the steel strand 11, and then the split type conical clamping piece 10 of the anchorage at the A end of the plate beam or the capping beam is pushed to move towards the large end of the inner conical hole 21, but when the pushing force from the B end of the anchorage is reduced or disappears, the follow-up spring 4 at the A end of the plate beam or the capping beam immediately props up the outward movement of the split type conical clamping piece 10 by utilizing the resilience force of the follow-up spring and resets and automatically locks. The phenomenon that the locking plate cannot follow up due to sliding or fall off cannot occur like other anchorage devices.
Therefore, the sawing effect generated when the anchors on the two sides are installed is avoided, and the anchor installation efficiency is improved. In the sawing effect, the problem of direct prestress loss is also relieved, and the anchoring force of the anchorage device is improved.
The other side of the anchor plate 2 is connected with an adjustable base plate 1, and the adjustable base plate 1 is rotatably connected to one side of the anchor plate 2 through threads; adjustable backing plate 1 is last to have the through-hole that supplies anchor to pass with steel strand wires 11, and steel strand wires pass anchor slab and through-hole 102, adjustable backing plate 1 rotates the one side of connecting at anchor slab 2 through the screw thread, closes length in order to adjust the stretch-draw locking force to steel strand wires through adjusting the screw thread of adjustable backing plate 1 and anchor slab 2 soon.
The adjustable base plate 1 and the anchor plate 2 are coaxially arranged, and acting force is more uniform and stable during steel strand tensioning.
The through hole 102 arranged on the adjustable base plate 1 can accommodate a plurality of steel strands arranged on the anchor plate 2 to rotate in a circular motion along the axis of the through hole.
The adjustable backing plate 1 is a circular body, the adjustable backing plate 1 is provided with a jack 101 on a circular outer ring, and the jack 101 is inserted into the detachable stressing rod 13 so as to conveniently rotate the adjustable backing plate 1.
In the prior art, the backing plate is fixedly mounted on the anchor plate 2 for abutting against the anchor plate, and in addition, has no other function. According to the adjustable base plate 1, the adjustable base plate 1 is connected with the anchor plate 2 through threads, the whole length of the adjustable base plate 1 after the adjustable base plate 1 is connected with the anchor plate 2 is adjusted through thread rotation, the tensile force of an anchorage device on a steel strand is adjusted, and the steel strand 11 can be slightly pulled or placed through rotation of the adjustable base plate, so that the prestress of the steel strand is adjusted.
The adjustable backing plate 1 is a circular body, the adjustable backing plate 1 is provided with a jack 101 on a circular outer ring, and the jack 101 is inserted into the detachable stressing rod 13 so as to conveniently rotate the adjustable backing plate 1.
The inner taper hole 21 is provided with a retreating block 9 at the bottom of the opening part of the tapered clamping piece, and the retreating block 9 is tightly propped against the split tapered clamping piece 10; the receding block 9 is made of flexible materials, so that the conical clamping piece 10 is prevented from being in a restrained state after the small end of the inner conical hole 21 enters cement paste, and cannot follow up again in time when being wrapped by concrete.
And when the repeated dynamic load from the road surface is detected, the retreating block 9 can provide a space (retreating) for two (more) times of follow-up of the conical clamping piece 10, and the prestress loss of the steel strand caused by the fatigue load of the anchorage device can be effectively reduced.
The receding block 9 is attached to the inner wall of the inner cone hole 21, a through hole is reserved for penetrating through the steel strand 11, the steel strand 11 is matched to block the conical hole, and a flexible filling body or an anticorrosive material filled in the inner cone hole 21 can be matched and sealed.
A limiting cavity 31 is arranged at one end, facing the follow-up spring 4, of the limiting plate 3, and a limiting pedestal 32 is arranged at one end, deviating from the follow-up spring 4, of the limiting plate 3 and used for supporting the follow-up spring 4; one end of the limiting cavity 31 is communicated with the inner taper hole 21 to form an anchor hole of the split type conical clamping piece 10 and a movable cavity of the follow-up spring 4. The limiting plate 3 is fixedly connected to the anchor plate 2 through bolts. The limiting plate 3 is fixedly arranged on the anchor plate 2, so that the processes of matching and mounting the limiting plate are saved, and the stress loss in the use of the engineering anchor is greatly reduced.
The limiting pedestal 32 is provided with a sealing washer 33 which is tightly propped against the follow-up spring 4, is bound on the excircle of the steel strand 11 to seal the movable cavity and is used for matching with a filling body or an anticorrosive material filled in the limiting cavity 31 in the seal.
The split type conical clamping piece 10 is formed by encircling 2-4 claw-shaped locking plates, the split type conical clamping piece 10 is in a cone frustum shape after being combined by the claw-shaped locking plates, and a through hole is reserved in the split type conical clamping piece and used for penetrating through the steel strand 11 for anchoring;
in the structure, a plurality of the conical holes are uniformly distributed, and the conical holes are symmetrically distributed by taking the longitudinal central line of the anchor plate 2 as a symmetrical line.
the self-locking anchorage device with low stress loss and retraction has the advantages of simple structure, convenient steel strand installation, no phenomena of sliding teeth, retreating and falling of the claw-shaped locking plate, bidirectional adjustment and great improvement on construction efficiency; each split type conical clamping piece 10 is synchronous in follow-up and basically equal in effective clamping length to the steel strand, so that the clamping force to the steel strand is uniform and synchronous, the discreteness is small, and the overall anchoring efficiency of the anchorage device is greatly improved; stress loss caused by tensioning and locking of the steel strand can be effectively compensated; the steel strand prestress loss caused by repeated loading of the anchorage device can be effectively prevented when the engineering anchorage device is used; the long-term effective anchoring stability of the anchorage device can be ensured;
example 2
Referring to fig. 12-16, a low-stress loss, low-retraction, self-locking anchor according to the present invention differs from embodiment 1 in the locking plate synchronization adjustment mechanism 6. The claw-shaped locking plate is provided with a piercing positioning slider 62 at the tail end facing the follow-up spring and is surrounded and fastened by the piercing positioning slider 62, a first groove 632 for placing a tension spring 631 is formed in the position, close to the piercing positioning slider, of the inner side of the claw-shaped locking plate, a second groove 642 for placing a snap spring 641 is formed in the position, facing the tail end of the follow-up spring, of the outer side of the locking plate, and the tension spring 631 can generate an external tension assisting force when a steel strand is rotated, so that the locking plate can be opened at the mouth;
The follow-up spring 4 is pressed by the limit plate 3 to tightly push the piercing positioning slide block 61.
the synchronization of the split type conical clamping piece 10 is realized through the matching of the piercing positioning sliding block 61 and the clamp spring 641, and the problem of uneven clamping force and the problem of prestress loss are solved.
The movement of the steel strand through the hole in the split tapered clip 10 is facilitated by the outward thrust on each claw lock by the design of the tensioning spring 631.
Other structures of this embodiment are the same as those of embodiment 1, and are not described herein.
Example 3
As shown in fig. 17-19, the anchor plate 2 of the present invention is square, and no adjustable pad is provided inside the anchor plate 2.
Other structures of this embodiment are the same as those of embodiment 1, and are not described herein.
Example 4
As shown in fig. 20-22, the anchor plate 2 of the present invention is square, and no adjustable pad is provided inside the anchor plate 2.
other structures of this embodiment are the same as those of embodiment 2, and are not described herein.
The above-mentioned embodiments are only for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present patent and to implement the same, and the scope of the present patent should not be limited by the embodiments, i.e. all equivalent changes and modifications made in the spirit of the present patent disclosure still fall within the scope of the present patent.
Claims (10)
1. a stress low-loss, low-retraction and self-locking anchorage device is characterized in that: comprises 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 cone holes, split type conical clamping pieces are arranged in the inner cone holes and at least comprise two claw-shaped locking plates, the split type conical clamping pieces are provided with synchronous adjusting structures, the synchronous adjusting structures synchronously push or leave the clamping pieces to facilitate the movement of the steel strand, the outer side of the piercing washer is provided with a following spring, and the split type conical clamping pieces are elastically pressed by the following spring;
The anchor plate is characterized in that a limiting plate is further arranged, the limiting plate compresses a follow-up spring to push the split type conical clamping piece to be in the inner conical hole, and the limiting plate is fixedly installed on one side of the anchor plate.
2. The low-stress-loss, low-retraction, self-locking anchor of claim 1, wherein: the synchronous adjusting structure adopts a piercing washer; the split type conical clamping piece is provided with a piercing gasket towards the direction of the follow-up spring, the piercing gasket synchronously pushes or leaves the clamping piece of the split type conical clamping piece, and the outer side of the piercing gasket is pressed tightly by the follow-up spring.
3. The low-stress-loss, low-retraction, self-locking anchor of claim 1, wherein: the synchronous adjusting structure adopts a punching positioning slide block;
The claw-shaped locking plate is provided with a piercing positioning slide block at the tail end facing the follow-up spring and is surrounded and fastened by the piercing positioning slide block, a first groove for placing a tension spring is arranged at the position, close to the piercing positioning slide block, of the inner side of the claw-shaped locking plate, the outer side of the locking plate is provided with a second groove for placing a clamp spring at the tail end facing the follow-up spring, and the tension spring can generate an outward-stretching assisting force when a steel strand is rotated, so that the locking plate can be opened at the opening part;
The follow-up spring is pressed by the limiting plate to push the piercing positioning slide block tightly.
4. The low-stress-loss, low-retraction, self-locking anchor of claim 1, wherein: one side of the anchor plate is fixedly provided with a limiting plate, a plurality of through holes for the anchoring steel strand to pass through are correspondingly formed in the limiting plate, the number of the through holes is equal to that of the conical holes, and the through holes are distributed in one-to-one correspondence with the distribution positions of the anchor holes and are located on the same corresponding axis respectively.
5. A low stress loss, low recoil, self locking anchor according to any one of claims 1 to 4, wherein: the other side of the anchor plate is connected with an adjustable base plate, and the adjustable base plate is rotatably connected to one side of the anchor plate through threads;
The adjustable base plate is correspondingly provided with through holes for the penetration of a plurality of anchoring steel strands, and the center line of the through holes of the adjustable base plate and the center line of the anchor plate are on the same axis.
6. The low-stress-loss, low-retraction, self-locking anchor of claim 5, wherein: the adjustable base plate is a circular body, the adjustable base plate is provided with a jack on a circular outer ring, and the jack is inserted into a detachable stressing rod so as to conveniently rotate the adjustable base plate.
7. a low stress loss, low recoil, self locking anchor according to any one of claims 1 to 2 and 3, wherein: the inner taper hole is provided with a retreating block at the bottom of the opening part of the tapered clamping piece, and the retreating block can be used for propping the split tapered clamping piece to buffer stress; the position retreating block is made of flexible materials.
8. the low-stress-loss, low-retraction, self-locking anchor of claim 7, wherein: the retreating block is attached to the inner wall of the inner cone hole, a through hole is reserved for the steel strand to penetrate through, and the steel strand is matched with the steel strand to block the conical hole.
9. The low stress loss, low recoil, self-locking anchor of any one of claims 1-2, 3, 4, and 7, wherein: one end of the limiting plate, facing the follow-up spring, is provided with a limiting cavity, and one end of the limiting plate, deviating from the follow-up spring, is provided with a limiting pedestal for supporting the follow-up spring; one end of the limiting cavity is communicated with the inner taper hole to form a movable cavity of the split type conical clamping piece and the follow-up spring;
or, the split type conical clamping piece is formed by 2-4 claw-shaped locking plates in a surrounding mode, the split type conical clamping piece is in a cone frustum shape after being combined by the claw-shaped locking plates, and a through hole is reserved in the split type conical clamping piece and used for penetrating through the steel strand for anchoring;
Or the plurality of conical holes are uniformly distributed on the end face of the anchor plate, and two conical holes positioned on the left side and the right side in the plurality of conical holes are symmetrically distributed by taking the longitudinal center line of the anchor plate as a symmetrical line.
10. The low-stress-loss, low-retraction, self-locking anchor of claim 9, wherein: the limiting pedestal is provided with a sealing washer which is tightly propped against the follow-up spring, and the inner hole wall of the sealing washer is tightly bound on the periphery of the steel strand so as to seal the movable chamber.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910774891.9A CN110565545A (en) | 2019-08-21 | 2019-08-21 | stress low-loss, low-retraction and self-locking anchorage device |
| PCT/CN2020/110357 WO2021032176A1 (en) | 2019-08-21 | 2020-08-20 | Self-locking anchorage device with low stress loss and low retraction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910774891.9A CN110565545A (en) | 2019-08-21 | 2019-08-21 | stress low-loss, low-retraction and self-locking anchorage device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110565545A true CN110565545A (en) | 2019-12-13 |
Family
ID=68775724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910774891.9A Pending CN110565545A (en) | 2019-08-21 | 2019-08-21 | stress low-loss, low-retraction and self-locking anchorage device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110565545A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112095466A (en) * | 2020-09-17 | 2020-12-18 | 东南大学 | FRP inhaul cable anchoring method and anchoring end |
| WO2021032176A1 (en) * | 2019-08-21 | 2021-02-25 | 杭州钜力锚杆科技有限公司 | Self-locking anchorage device with low stress loss and low retraction |
| CN114382230A (en) * | 2022-01-25 | 2022-04-22 | 中建鹭港建设有限公司 | Prestressed beam structure and construction method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000000359U (en) * | 1998-06-09 | 2000-01-15 | 박재만 | Retensioning device of prestressed structure |
| KR20050031086A (en) * | 2005-03-04 | 2005-04-01 | 오원석 | Removal soil nailed wall for wire fixation anchor which it will sting |
| CN204826420U (en) * | 2015-08-05 | 2015-12-02 | 柳州市威尔姆预应力有限公司 | Bury special construction tool of ground tackle deeply |
| CN207176485U (en) * | 2017-09-18 | 2018-04-03 | 湖北益通建设股份有限公司 | A kind of prestress wire stretch-draw anchor structure |
| CN211472216U (en) * | 2019-08-21 | 2020-09-11 | 杭州钜力锚杆科技有限公司 | Stress low-loss, low-retraction and self-locking anchorage device |
-
2019
- 2019-08-21 CN CN201910774891.9A patent/CN110565545A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000000359U (en) * | 1998-06-09 | 2000-01-15 | 박재만 | Retensioning device of prestressed structure |
| KR20050031086A (en) * | 2005-03-04 | 2005-04-01 | 오원석 | Removal soil nailed wall for wire fixation anchor which it will sting |
| CN204826420U (en) * | 2015-08-05 | 2015-12-02 | 柳州市威尔姆预应力有限公司 | Bury special construction tool of ground tackle deeply |
| CN207176485U (en) * | 2017-09-18 | 2018-04-03 | 湖北益通建设股份有限公司 | A kind of prestress wire stretch-draw anchor structure |
| CN211472216U (en) * | 2019-08-21 | 2020-09-11 | 杭州钜力锚杆科技有限公司 | Stress low-loss, low-retraction and self-locking anchorage device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021032176A1 (en) * | 2019-08-21 | 2021-02-25 | 杭州钜力锚杆科技有限公司 | Self-locking anchorage device with low stress loss and low retraction |
| CN112095466A (en) * | 2020-09-17 | 2020-12-18 | 东南大学 | FRP inhaul cable anchoring method and anchoring end |
| CN114382230A (en) * | 2022-01-25 | 2022-04-22 | 中建鹭港建设有限公司 | Prestressed beam structure and construction method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110565545A (en) | stress low-loss, low-retraction and self-locking anchorage device | |
| US3967421A (en) | Tie formed of stressed high-tensile steel tendons | |
| CN201704689U (en) | Four-corner-reinforced pre-stressed anchor rope head for reinforcing rock slope | |
| US7765752B2 (en) | Anchor system with substantially longitudinally equal wedge compression | |
| US3139730A (en) | Rock anchor | |
| CN204152236U (en) | A kind of external prestressing strengthening device | |
| CN108843039B (en) | Method for reinforcing beam by prestressed carbon fiber plate | |
| CN103352581A (en) | Method for strengthening sintering clay brick masonry structure through internal prestressed steel anchor rods | |
| CN204491425U (en) | A kind of external prestressing strengthening structure of T-shaped bridge diaphragm | |
| CN211472216U (en) | Stress low-loss, low-retraction and self-locking anchorage device | |
| KR20180005796A (en) | Ground reinforcement fixing apparatus and method for construction | |
| CN100365245C (en) | Shell expansion type rock bolt | |
| CN202925767U (en) | Low-retraction pre-stressed anchorage device | |
| US3491431A (en) | Method and devices for post-tensioning concrete and structural materials | |
| CN211472215U (en) | Self-locking, low-stress-loss and low-retraction anchor structure | |
| CN211472214U (en) | Stress low-loss, low-retraction and self-locking anchorage device structure | |
| CN109750599B (en) | Slow-bonding low-retraction prestressed short cable system and calculation and tensioning methods | |
| CN203834478U (en) | Active clamping piece type pinching, tensioning and locking device for pre-stressed anchor cable | |
| USRE34350E (en) | Tie formed of stressed high-tensile steel tendons | |
| EP2893139B1 (en) | Arrangement for the high-strength anchorage of a tendon having a tie rod in a structural element and method for producing an anchorage of this type | |
| CN102912987B (en) | Stress applying method and tool thereof for low retraction pre-stress concrete member | |
| CN108843040B (en) | Carbon fiber plate inner curved surface clamping type anchorage device | |
| CN213896767U (en) | Self-locking anchorage device | |
| CN210766441U (en) | Stress low-loss anchorage device | |
| CN209798745U (en) | Prestressing force adjustable anchor rope |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |