CN114150570B - Low-retraction vertical prestress anchoring device with self-limiting function - Google Patents
Low-retraction vertical prestress anchoring device with self-limiting function Download PDFInfo
- Publication number
- CN114150570B CN114150570B CN202111578902.XA CN202111578902A CN114150570B CN 114150570 B CN114150570 B CN 114150570B CN 202111578902 A CN202111578902 A CN 202111578902A CN 114150570 B CN114150570 B CN 114150570B
- Authority
- CN
- China
- Prior art keywords
- nut
- anchoring
- backing plate
- permanent magnet
- anchor
- 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.)
- Active
Links
- 238000004873 anchoring Methods 0.000 title claims abstract description 60
- 229910000831 Steel Inorganic materials 0.000 claims description 41
- 239000010959 steel Substances 0.000 claims description 41
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 5
- 230000002787 reinforcement Effects 0.000 abstract 1
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010008 shearing Methods 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
-
- 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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a low-retraction vertical prestress anchoring device with a self-limiting function, which belongs to the field of bridge anchoring installation. The anchoring device has more friction sources, can well limit the retraction of the prestressed reinforcement, and can effectively prevent the anchoring nut from reverse self-torsion caused by shaking.
Description
Technical Field
The invention belongs to the technical field of bridge anchoring and installation, and provides a low-retraction vertical prestress anchoring device with a self-limiting function.
Background
Along with the rapid development of highway bridges, the problems of diseases generated when the main girder adopts a box section are increased, and particularly, vertical and oblique cracks often appear at the position of a main girder web plate of a large-span and wide-box girder bridge, thereby greatly influencing the structural bearing capacity and the safety of the main girder. According to the requirements of design specifications such as shear resistance and crack resistance of the bridge, the three-way prestress application is carried out on the main beam, so that the overall rigidity is improved, and the occurrence of cracks is delayed or prevented. The longitudinal and transverse prestress steel strand clamping type anchorage device in the current stage is large, and is automatically anchored by a machine, and the prestress loss caused by anchorage deformation and steel bar retraction is small. However, the vertical prestress is usually made of screw steel, the anchoring device is not a clamping piece type anchoring device, the friction sources are few, and the vertical prestress is mostly installed manually. If the bridge shake caused by the vehicle load, wind load and resonance phenomenon is obvious, the anchoring nut can be reversely and automatically twisted, so that the nut pretightening force is lost, and the deformed steel bar is retracted, so that the problem of increasing the vertical pretightening force loss is solved; meanwhile, if the anchoring nut and the embedded anchor backing plate have gaps and are staggered, the installation accuracy is insufficient, the perpetual stress of the structure is difficult to guarantee, and great potential safety hazards are brought to the operation and the use of the bridge. At present, the primary tension force and the secondary tension force are increased to offset the prestress loss. And for improving the anchoring device, the research designs of increasing the installation precision, limiting the retraction of the reinforcing steel bars and improving the anchoring effect to reduce the prestress loss are relatively few.
Disclosure of Invention
In view of the above, the invention aims to provide a low-retraction vertical prestress anchoring device which is reasonable in structural design and has a self-limiting function and aims at prestress loss diseases caused by the vertical prestress anchoring device, so that the problems of small friction sources of the traditional vertical prestress anchoring device, large clearance, mutual dislocation and insufficient precision of an anchoring nut and an embedded anchor backing plate under manual installation are solved, and the problems that the anchoring nut is reversely and self-twisted and loose due to shaking on a special bridge, cannot limit the self, and cannot prevent steel bar retraction and prestress loss increase are solved.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a low-retraction vertical prestress anchoring device with a self-limiting function, which comprises an anchoring nut, a limiting nut and an embedded anchor backing plate which are sequentially sleeved outside screw steel, wherein the anchoring nut is provided with an inner surface fracture thread matched with the screw steel and an outer surface thread matched with the limiting nut, at least one pair of opposite and staggered built-in grooves distributed along the axial direction of the anchoring nut are formed in the inner wall of the anchor screw hole of the anchoring nut, a group of movable permanent magnets capable of acting on the screw steel are arranged in the opposite and staggered built-in grooves, each group of movable permanent magnets consists of an N-pole permanent magnet and an S-pole permanent magnet, and the N-pole permanent magnet and the S-pole permanent magnet are provided with magnet surface threads which are matched with the screw steel on the opposite surfaces facing each other.
Further, the magnet surface screw thread of the N-pole permanent magnet has a downward draft angle, and the magnet surface screw thread of the S-pole permanent magnet has an upward draft angle.
Further, the outer surface of the movable permanent magnet is provided with a dampproof and corrosion-proof coating.
Further, the device also comprises a nut torque wrench which acts on the anchoring nut and is internally provided with a direct current electromagnet.
Further, the socket height of the nut torque wrench is greater than the total height of the movable permanent magnet provided on the anchor nut.
Further, the inner wall of the limiting screw hole diameter of the limiting nut is provided with an inner surface thread matched with an outer surface thread arranged on the anchor nut, the corresponding end of the limiting nut, which faces the embedded anchor backing plate, is provided with a bottom hollowed-out groove, and a pawl is arranged in the bottom hollowed-out groove.
Further, the bottom hollow groove is evenly distributed with more than two in the radial direction of the limit nut.
Further, an inner ring aperture, an outer ring aperture and a ratchet space are arranged on the embedded anchor backing plate, the inner ring aperture is matched with the outer diameter of the screw steel, and the outer ring aperture is matched with the outer diameter of the limit nut; the aperture of the inner ring and the aperture of the outer ring are in a large-small structure in a step shape, and a ratchet space is arranged on a step surface between the inner ring aperture and the outer ring aperture; ratchet teeth matched with pawls arranged on the limit nuts are arranged in the ratchet space.
Further, the height of the ratchet teeth arranged in the embedded anchor backing plate is 2-3mm larger than the height of the pawl.
The invention also provides an anchoring method based on the anchoring device, which comprises the following steps:
step 1), fixing an embedded anchor backing plate and enabling screw steel to penetrate through the aperture of an inner ring of the anchor backing plate;
step 2), electrifying a nut torque wrench with a built-in direct current electromagnet, and sleeving a nut to be anchored;
step 3), adjusting the current until the magnetic force generated by the direct current electromagnet is greater than the magnetic force of the movable permanent magnet, so that the movable permanent magnets are respectively adsorbed in the built-in grooves;
step 4), sleeving an anchor nut on the screw steel, and starting to screw clockwise by using a nut torque wrench maintaining an electrified state until reaching the bottom of a ratchet space of the embedded anchor backing plate;
step 5), the nut torque wrench is powered off and removed, and the movable permanent magnets are mutually adsorbed and meshed on the screw thread steel after the movable permanent magnets are powered off;
step 6), sleeving the limit nut on the anchor nut until reaching the bottom of the ratchet space of the embedded anchor backing plate and a pawl at the bottom of the limit nut is embedded into ratchet teeth;
and 7) sealing the anchor.
The beneficial effects of the invention are as follows: the vertical prestress anchoring device has more friction sources, such as screw thread fit between the anchoring nut and the limiting nut, ratchet pawl fit between the limiting nut and the embedded anchoring plate, magnetic force and screw thread fit provided by the movable permanent magnet in the anchoring nut can bring multiple resultant force effects to screw thread steel, so that the prestress steel bar can be well limited to retract, reverse self-torsion of the anchoring nut caused by shaking can be effectively prevented, the vertical prestress anchoring device is suitable for bridges of the type of crossing rivers, seas, canyons and large traffic flow, and engineering design problems such as anti-shake and vibration prevention are met.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a top plan view of the structure of the present invention;
FIG. 3 is a schematic view of an anchor nut;
FIG. 4 is a schematic view of an axial cross-section of an anchor nut;
FIG. 5 is a schematic view of a stop nut;
FIG. 6 is a schematic illustration of an anchor pad;
FIG. 7 is a three-dimensional schematic of a movable permanent magnet;
FIG. 8 is a schematic cross-sectional view of a movable permanent magnet shaft;
FIG. 9 is a schematic diagram of the operational principle of the movable permanent magnet;
FIG. 10 is a schematic diagram of the working principle of the nut torque wrench before power-on;
FIG. 11 is a schematic diagram of the working principle of the nut torque wrench after being energized;
reference numerals: an anchor nut 1, a limit nut 2, a movable permanent magnet 3, an embedded anchor backing plate 4, a nut torque wrench 5 and a screw thread steel 6;
the internal surface fracture thread 1-1, the external surface thread 1-2, the anchor screw aperture 1-3 and the built-in groove 1-4;
the thread comprises an inner surface thread 2-1, a thread limiting aperture 2-2, a bottom hollowed-out groove 2-3 and a pawl 2-4;
n pole permanent magnet 3-1, S pole permanent magnet 3-2, magnet surface screw thread 3-3, downward tooth form angle 3-4, upward tooth form angle 3-5;
an inner ring aperture 4-1, an outer ring aperture 4-2 and a ratchet space 4-3;
and a direct current electromagnet 5-1.
Detailed Description
The invention is further described below in connection with the following detailed description. Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
As shown in fig. 1-9, the low-retraction vertical prestress anchoring device with the self-limiting function in the embodiment consists of an anchoring nut 1, a limiting nut 2, a movable permanent magnet 3, an embedded anchor backing plate 4 and a matched nut torque wrench 5. Wherein, the anchor nut 1 comprises an inner surface broken thread 1-1, an outer surface thread 1-2, an anchor screw aperture 1-3 and an internal groove 1-4; the limit nut 2 comprises an inner surface thread 2-1, a limit screw aperture 2-2, a bottom hollowed groove 2-3 and a pawl 2-4; the movable permanent magnet 3 comprises an N-pole permanent magnet 3-1, an S-pole permanent magnet 3-2, a magnet surface thread 3-3, a downward tooth-shaped angle 3-4 and an upward tooth-shaped angle 3-5; the embedded anchor backing plate 4 comprises an inner ring aperture 4-1, an outer ring aperture 4-2 and a ratchet space 4-3, wherein the inner ring aperture 4-1 and the outer ring aperture 4-2 are of a step-shaped structure with a large size and a small size, and the ratchet space 4-3 is arranged on a step surface between the inner ring aperture 4-1 and the outer ring aperture 4-2; ratchet teeth matched with pawls 2-4 arranged on the limit nut 2 are arranged in the ratchet space 4-3; the nut torque wrench 5 is internally provided with a direct current electromagnet 5-1.
Specifically, the anchoring nut 1 is characterized in that on the basis of a hexagonal nut, the broken threads 1-1 on the inner surface are broken in a layered manner and are matched with the threads on the outer surface of the deformed steel bar 6, the outer diameter of the deformed steel bar 6 is used as an anchor thread aperture 1-3 of the anchoring nut 1, and the anchoring nut 1 is screwed clockwise; the thread fracture part is provided with four built-in grooves 1-4 in total, the built-in grooves 1-4 are arranged in pairs, the built-in grooves 1-4 of one pair are opposite and are arranged in a staggered manner, and a group of movable permanent magnets 3 are arranged in the built-in grooves 1-4 of one pair; the external surface threads 1-2 are arranged outside the anchor nut 1, the direction of the external surface threads 1-2 is the same as that of the internal surface broken threads 1-1, and the external surface threads are matched with the internal surface threads 2-1 of the limit nut 2; the limit nut 2 is connected with the anchor nut 1 in a matching way through the inner surface threads 2-1 and the outer surface threads 1-2, and is similar to a nut-nut structure, and the limit nut 3 is screwed clockwise; taking the outer diameter of the anchor nut 1 as a limiting hole diameter 2-2 of the limiting nut 2; the bottom of the limit nut 2 is provided with a bottom hollowed groove 2-3, a pawl 2-4 is welded in the groove, and the pawl 2-4 can only rotate towards the screwing direction of the limit nut 2; the embedded anchor backing plate 4 takes the outer diameter of the deformed steel bar 6 as an inner ring aperture 4-1 and takes the outer diameter of the limit nut 2 as an outer ring aperture 4-2; ratchet teeth matched with the pawls 2-4 are prefabricated in a ratchet space 4-3 at the upper middle section of the embedded anchor backing plate 4, and the ratchet teeth are used for preventing the pawls 2-4 from rotating towards the unscrewing direction of the limit nuts; the movable permanent magnet 3 is preloaded in the built-in groove 1-4 of the anchor nut 1 and is two pairs of N, S pole opposite permanent magnets, namely an N pole permanent magnet 3-1 and an S pole permanent magnet 3-2, one end, close to the center line of the section, is provided with a magnet surface thread 3-3 and is matched with the surface thread of the screw thread steel 6, and the other end is smooth; the N pole permanent magnet 3-1 has a downward tooth shape angle 3-4 and is pre-installed in the left side built-in groove 1-4, and the S pole permanent magnet 3-2 has an upward tooth shape angle 3-5 and is pre-installed in the right side built-in groove 1-4; thus, when the anchor nut 1 is not in use, the two opposite permanent magnets are mutually adsorbed and meshed through magnetic force and the screw threads on the surface of the upper magnet, the top and the bottom of the magnet are limited by the grooves and cannot fall off, and at the moment, the anchor nut 1 and the movable permanent magnet 3 form an integral structure; the nut torque wrench 5 is an energizable wrench, and a direct current electromagnet 5-1 is arranged in the wrench, when direct current passes through the wrench, the direct current electromagnet 5-1 generates a stronger magnetic field than the movable permanent magnet 3, so that the wrench is separated, and the screw thread steel is convenient to enter.
The movable permanent magnet 3 and the tooth-shaped angle thereof in the embodiment are made of high-strength materials, so that shearing damage is prevented; the surface of the movable permanent magnet 3 is provided with a dampproof and corrosion-proof coating, so that the permanent magnetism of the movable permanent magnet is ensured.
The pawl 2-4 at the bottom of the limit nut 2 in the embodiment is welded in the inner surface of the bottom hollow groove 2-3, so that the pawl is always integrated with the limit nut 2 in rotation.
The height of ratchet teeth in the ratchet space 4-3 of the embedded anchor pad 4 in the embodiment is 2-3mm greater than the height of the pawl 2-4; to ensure that the matching between the two is effective. In addition, the bottom hollow groove 2-3 is uniformly distributed with more than two pawls in the radial direction of the limit nut 2, so that a plurality of pawls are arranged more, and the matching capacity of the pawl ratchet wheel is improved.
The height of the trepanning of the nut torque wrench 5 in this embodiment is greater than the height of the upper and lower sets of movable permanent magnets of the anchor nut 1 to ensure that all magnets in the anchor nut can be separated after they are energized to ensure that the threaded steel can smoothly enter the anchor nut.
By adopting the scheme, when the vertical prestress loss is large, the anchoring device needs to be improved. The device replaces the traditional steel bar threaded anchorage, takes a bolt-nut structure as a basis, and has the functions of limiting and guaranteeing low retraction of the prestressed threaded steel bars. The embedded anchor backing plate in the vertical prestress anchoring device is still arranged in the beam as an embedded part, when the anchoring nut is not used, two opposite permanent magnets in the nut are mutually adsorbed and meshed through magnetic force and surface threads, the top and the bottom of the permanent magnets are limited by the grooves and cannot fall off, and at the moment, the anchoring nut and the magnets form an integral structure; when the anchoring device is started to be used, firstly, a nut torque wrench with a direct current electromagnet is electrified and sleeved on an anchoring nut, the electromagnet generates a magnetic field after the electrification, the current is adjusted until the magnetic force generated by the electromagnet is larger than the magnetic force of the opposite permanent magnet, at the moment, the opposite permanent magnets are separated and adsorbed in the grooves, and the threaded steel can pass through the grooves. Secondly, starting to screw the anchor nut, and screwing the nut into the upper layer of the embedded anchor backing plate step through the outer surface thread until the nut is tightly attached to the bottom of the ratchet space. When the power supply is stopped, the magnetic force generated by the electromagnet disappears, the two groups of opposite magnets firmly adsorb the deformed steel bars again, and the anchor nut and the deformed steel bars cannot move relatively at the moment. Finally, the limit nut is sleeved on the anchor nut, when the pawl at the bottom hollow groove is twisted clockwise along with the anchor nut, the pawl is blocked by artificial action and hidden at the bottom hollow groove until the diameter of the hole of the embedded anchor backing plate is suddenly changed into the diameter of a matched ratchet tooth, the pawl is sprung out after being unobstructed, the pawl is embedded into the ratchet tooth, and at the moment, the pawl is completely embedded into the embedded anchor backing plate, and the limit nut cannot be proved to be screwed when the pawl is twisted reversely. The vertical prestress anchoring device is installed, and then corresponding anchoring is carried out.
Therefore, the magnet adsorbs the screw thread steel to increase the friction force between the anchor nut and the prestress rib, the tooth angles of the left and right opposite magnets are opposite angles, the tooth angle of the magnet in the left built-in groove is downward, and the tooth angle of the magnet in the right built-in groove is upward. If the screw thread steel and the anchor nut have opposite movement trend, the two tooth-shaped angles generate a pair of opposite locking forces, the broken threads, the magnet threads and the locking forces act together, so that the friction force is further increased, and the screw thread steel is prevented from retracting and the nut is prevented from reversing. After the pawl of the limit nut is embedded into the ratchet teeth of the embedded anchor backing plate, the limit nut cannot vertically displace any more, the limit nut is similar to a welded-dead nut, the anchor nut is similar to a bolt with a positive-rotation thread on the outer surface, if the anchor nut reversely rotates, the anchor nut and the limit nut can only be tightened more and more due to the fact that the nut is fixed, at the moment, the embedded anchor backing plate, the limit nut and the anchor nut form a whole, cannot be loosened, and the vertical prestress anchor device is further guaranteed to be prevented from falling and loose in the bridge operation period.
Referring again to fig. 10-11, embodiments of the present anchoring device will be described in detail below: firstly, embedding an embedded anchor pad in a beam, and enabling finish rolling screw thread steel to pass through the aperture of an inner ring of the anchor pad; then, a nut torque wrench with a built-in direct current electromagnet is electrified and sleeved on an anchor nut to be used, and the current is adjusted until the magnetic force generated by the electromagnet is larger than the magnetic force of the movable permanent magnet, so that the movable permanent magnets are respectively adsorbed in the built-in grooves of the anchor nut; then sleeving the anchor nut on the finish-rolled screw thread steel, and starting to screw clockwise by using the energized nut torque wrench until the anchor nut is at the bottom of the ratchet space; then, the power supply of the nut torque wrench is stopped, the magnetic force generated by the electromagnet disappears, and the movable permanent magnets are mutually adsorbed to be meshed on the finish-rolled screw thread steel, so that the nut torque wrench cannot reversely rotate, and then the nut torque wrench is taken down; and then the limit nut is sleeved on the anchor nut, and the pawl is manually pushed slightly into the bottom hollow groove during clockwise screwing until the bottom of the limit nut is embedded into the embedded anchor pad, the pawl is sprung and embedded into ratchet teeth, and the pawl cannot be twisted reversely and stopped during vertical movement, so that the anchor is sealed.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (6)
1. The low-retraction vertical prestress anchoring device with the self-limiting function comprises an anchoring nut (1), a limiting nut (2) and an embedded anchor backing plate (4) which are sleeved outside a threaded steel (6) in sequence, and is characterized in that an inner surface fracture thread (1-1) matched with the threaded steel and an outer surface thread (1-2) matched with the limiting nut are arranged on the anchoring nut, at least one pair of opposite and staggered built-in grooves (1-4) distributed along the axial direction of the anchoring nut are formed in the inner wall of the anchoring screw hole (1-3) of the anchoring nut, a group of movable permanent magnets (3) capable of acting on the threaded steel are arranged in the pair of opposite and staggered built-in grooves, each group of movable permanent magnets consists of an N-pole permanent magnet (3-1) and an S-pole permanent magnet (3-2), and magnet surface threads (3-3) matched with the threaded steel are arranged on the corresponding surfaces facing each other;
an inner surface thread (2-1) matched with an outer surface thread arranged on the anchor nut is arranged on the inner wall of a limit screw hole diameter (2-2) of the limit nut, a bottom hollowed groove (2-3) is formed in the corresponding end of the limit nut, which faces the embedded anchor backing plate, and a pawl (2-4) is arranged in the bottom hollowed groove;
an inner ring aperture (4-1), an outer ring aperture (4-2) and a ratchet space (4-3) are arranged on the embedded anchor backing plate, the inner ring aperture is matched with the outer diameter of the screw steel, and the outer ring aperture is matched with the outer diameter of the limit nut; the aperture of the inner ring and the aperture of the outer ring are of a large-small structure in a step shape, and the ratchet space is arranged on the step surface between the two structures; ratchet teeth matched with pawls arranged on the limit nuts are arranged in the ratchet space;
the nut torque wrench (5) acts on the anchoring nut, and a direct current electromagnet (5-1) is arranged in the nut torque wrench;
firstly, fixing an embedded anchor backing plate, and enabling screw steel to penetrate through the aperture of an inner ring of the anchor backing plate; electrifying a nut torque wrench with a built-in direct current electromagnet, and sleeving a nut to be anchored; then, the current is regulated until the magnetic force generated by the direct current electromagnet is larger than the magnetic force of the movable permanent magnet, so that the movable permanent magnets are respectively adsorbed in the built-in grooves; then sleeving an anchor nut on the screw steel, and starting to screw clockwise by using a nut torque wrench maintaining the electrified state until reaching the bottom of a ratchet wheel space of the embedded anchor backing plate; then, the nut torque wrench is powered off and taken away, and the movable permanent magnets are mutually adsorbed and meshed on the screw thread steel after the movable permanent magnets are powered off; sleeving the limit nut on the anchor nut until the limit nut reaches the bottom of the ratchet space of the embedded anchor backing plate and a pawl at the bottom of the limit nut is embedded into ratchet teeth; and finally, sealing the anchor.
2. The low-retraction vertical prestress anchoring device with self-limiting function according to claim 1, wherein the magnet surface threads of the N-pole permanent magnet have a downward tooth form angle (3-4) and the magnet surface threads of the S-pole permanent magnet have an upward tooth form angle (3-5).
3. The low-retraction vertical prestress anchoring device with self-limiting function according to claim 1, wherein a moisture-proof and corrosion-proof coating is arranged on the outer surface of the movable permanent magnet.
4. The low-retraction vertical prestress anchoring device with self-limiting function according to claim 1, wherein the socket height of the nut torque wrench is greater than the total height of the movable permanent magnet provided on the anchoring nut.
5. The low-retraction vertical prestress anchoring device with self-limiting function according to claim 1, wherein more than two bottom hollowed grooves are uniformly distributed in the radial direction of the limiting nut.
6. The low-retraction vertical prestress anchoring device with self-limiting function according to claim 1, wherein the height of ratchet teeth arranged in the embedded anchor backing plate is 2-3mm greater than the height of pawls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111578902.XA CN114150570B (en) | 2021-12-22 | 2021-12-22 | Low-retraction vertical prestress anchoring device with self-limiting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111578902.XA CN114150570B (en) | 2021-12-22 | 2021-12-22 | Low-retraction vertical prestress anchoring device with self-limiting function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114150570A CN114150570A (en) | 2022-03-08 |
| CN114150570B true CN114150570B (en) | 2023-12-08 |
Family
ID=80451771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111578902.XA Active CN114150570B (en) | 2021-12-22 | 2021-12-22 | Low-retraction vertical prestress anchoring device with self-limiting function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114150570B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115199691B (en) * | 2022-08-15 | 2024-01-26 | 重庆交通大学 | Large inertial mass ratio inertial container based on coaxial magnetic gear |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2555350Y (en) * | 2002-07-01 | 2003-06-11 | 芮万柱 | Special safe for car |
| JP2009299325A (en) * | 2008-06-12 | 2009-12-24 | Kajima Corp | Plastic hinge structure of concrete-based member, and concrete-based member |
| US8402702B1 (en) * | 2011-04-01 | 2013-03-26 | Roberto Villaverde | Aseismic sliding isolation system using hydromagnetic bearings |
| CN203685861U (en) * | 2014-01-24 | 2014-07-02 | 台州市东泰轴承有限公司 | Novel bearing |
| US9666973B1 (en) * | 2016-06-10 | 2017-05-30 | Amphenol Corporation | Self-locking connector coupling |
| KR101844765B1 (en) * | 2017-08-16 | 2018-04-05 | 홍석희 | The hollow steel bar which self-prestressed using by counteraction press system and prestressing method using that |
| CN108517765A (en) * | 2018-04-13 | 2018-09-11 | 重庆交通大学 | Deformed bar anchor |
| CN210830069U (en) * | 2019-10-31 | 2020-06-23 | 宁波俋金机械有限公司 | Nonstandard bolt with adjustable length |
-
2021
- 2021-12-22 CN CN202111578902.XA patent/CN114150570B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2555350Y (en) * | 2002-07-01 | 2003-06-11 | 芮万柱 | Special safe for car |
| JP2009299325A (en) * | 2008-06-12 | 2009-12-24 | Kajima Corp | Plastic hinge structure of concrete-based member, and concrete-based member |
| US8402702B1 (en) * | 2011-04-01 | 2013-03-26 | Roberto Villaverde | Aseismic sliding isolation system using hydromagnetic bearings |
| CN203685861U (en) * | 2014-01-24 | 2014-07-02 | 台州市东泰轴承有限公司 | Novel bearing |
| US9666973B1 (en) * | 2016-06-10 | 2017-05-30 | Amphenol Corporation | Self-locking connector coupling |
| KR101844765B1 (en) * | 2017-08-16 | 2018-04-05 | 홍석희 | The hollow steel bar which self-prestressed using by counteraction press system and prestressing method using that |
| CN108517765A (en) * | 2018-04-13 | 2018-09-11 | 重庆交通大学 | Deformed bar anchor |
| CN210830069U (en) * | 2019-10-31 | 2020-06-23 | 宁波俋金机械有限公司 | Nonstandard bolt with adjustable length |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114150570A (en) | 2022-03-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2007249069B2 (en) | Adhesive insert, system for securing an adhesive insert and system for anchoring a foundation | |
| RU2407894C1 (en) | Deformed roof bolting | |
| CN102182146B (en) | Prestress rib tensioning equipment, system and method and concrete continuous box girder | |
| CN114150570B (en) | Low-retraction vertical prestress anchoring device with self-limiting function | |
| US7726082B2 (en) | Anchor wedge configuration for tendon anchors | |
| US8899883B2 (en) | Anchor tendon with selectively deformable portions | |
| CN106284345A (en) | A kind of prestressed anchor fastening system | |
| CN108930346B (en) | Self-resetting swinging wall containing buckling restrained shape memory alloy bars and building | |
| CN202047370U (en) | Prestressed reinforcing steel tensioning device and prestressed tensioning system of concrete bridge | |
| CN201671232U (en) | Large-diameter steel strand anchoring device | |
| CN110777960A (en) | Beam hinge assembly type self-resetting friction connection node structure and method | |
| JPH08319696A (en) | Screw joint for steel bar and joint fitting | |
| CN110616855A (en) | Steel bar mechanical connection structure and connection method for prefabricated concrete structure | |
| CN207620225U (en) | A kind of finish rolling deformed bar being chiefly used in bridge structure | |
| CN114232463A (en) | C-shaped steel-friction damper combined energy dissipation structure and method | |
| CN208803374U (en) | A kind of low retracting secondary stretch-draw anchorage | |
| CN1288307C (en) | Component for fixing anchor bar/anchor cable head and method for slope stabilization | |
| CN1664265A (en) | Secondary tensile prestressed anchorage | |
| EP3161226A1 (en) | Anchor dowel | |
| JP2020190103A (en) | Precast concrete member joining method | |
| CN211396284U (en) | Connecting structure of flat anchor assembly | |
| EP1680606A1 (en) | Fixing element | |
| CN220247386U (en) | Friction enhanced embedded type prestress anchor with annular ribs | |
| CN211342977U (en) | Prestressed anchoring rod | |
| CN201209293Y (en) | Stretching and supporting anchor device at single filament stay stretching en under low-stretching control stress |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |