CN219824903U - Deep-buried low-retraction anchor tensioning structure - Google Patents
Deep-buried low-retraction anchor tensioning structure Download PDFInfo
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- CN219824903U CN219824903U CN202321109384.1U CN202321109384U CN219824903U CN 219824903 U CN219824903 U CN 219824903U CN 202321109384 U CN202321109384 U CN 202321109384U CN 219824903 U CN219824903 U CN 219824903U
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- anchor
- low
- retraction
- deep
- nut
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 58
- 239000010959 steel Substances 0.000 claims abstract description 58
- 239000004567 concrete Substances 0.000 claims abstract description 20
- 230000001681 protective effect Effects 0.000 claims abstract description 10
- 238000004873 anchoring Methods 0.000 claims abstract description 8
- 239000011178 precast concrete Substances 0.000 claims abstract description 3
- 230000004323 axial length Effects 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 4
- 230000003014 reinforcing effect Effects 0.000 abstract description 4
- 230000002787 reinforcement Effects 0.000 abstract 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
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- Joining Of Building Structures In Genera (AREA)
Abstract
The utility model discloses a deep-buried low-retraction anchor tensioning structure. Comprising the following steps: the anchoring structure is used for pouring an anchor cup and a spiral steel bar which are fixedly connected in the concrete, a plurality of steel strands are arranged, one end of each steel strand is fixedly connected with an anchor rod which is fixedly poured in the concrete, and the other end of each steel strand penetrates through the spiral steel bar and the anchor cup and is connected with the primary tension structure; the stretch-draw structure once sets up in pouring prefabricated concrete surface recess, includes: a deep-buried casing, a low-retraction anchor ring and a low-retraction nut; the secondary tensioning structure is arranged outside the groove on the surface of the poured precast concrete and comprises a reverse wire tensioning rod, a reverse wire rear anchor nut, a forward and reverse wire connecting nut and a jack; the utility model adopts the tension rod to replace the conventional secondary tensioning steel strand, so that the centering installation can be more quickly carried out, and the integral secondary tensioning of the low-retraction anchor device can be better completed; through setting up the deep-buried protective casing, external with secondary stretch-draw spike, the reinforcing bar bypasses the deep-buried protective casing, has realized the stretch-draw operation in the narrow and small space, has avoided reinforcing bar cutting and reinforcement.
Description
Technical Field
The utility model belongs to the technical field of building equipment design, in particular to the technical field of inhaul cable anchoring and tensioning equipment design thereof, and particularly relates to a secondary tensioning structure design of a deeply buried low-retraction anchor.
Background
At present, dense annular U-shaped 'well' -shaped prestress steel bundles are horizontally arranged in a cable stayed bridge tower column cable area, the length of the steel bundles is short, the tensioning control force is large, and the low-retraction anchor is needed to be used for tensioning for the second time. Because the tower column steel bars are densely arranged, the required secondary tensioning space is larger along with the increase of control stress, and the occupation space of the conventional anchor grooves and the built-in supporting feet is large, so that a large number of main bars are cut, additional cost and time are spent for reinforcing, and the integrity of the tower column is also influenced.
Disclosure of Invention
The utility model discloses a deep-buried low-retraction anchor tensioning structure. The utility model aims to provide a secondary tensioning structure of a deeply buried low-retraction anchor, which solves the problem of prestress loss caused by short-beam prestress tensioning and retraction of a cable-stayed bridge tower column, and can ensure the integrity and nondestructive stress of the tower column steel bars.
The utility model is realized by the following technical scheme:
the utility model provides a low anchor stretch-draw structure that contracts deeply which characterized in that: comprises an anchoring structure, a primary tensioning structure and a secondary tensioning structure;
the anchoring structure includes: pouring an anchor cup and a spiral steel bar which are fixedly connected in the concrete, wherein a plurality of steel strands are arranged, one end of each steel strand is fixedly connected with an anchor rod which is fixedly poured in the concrete, and the other end of each steel strand penetrates through the spiral steel bar and the anchor cup to be connected with a primary tension structure;
the stretch-draw structure once sets up in pouring prefabricated concrete surface recess, includes: a deep-buried casing, a low-retraction anchor ring and a low-retraction nut; the bottom opening of the deep-buried protective cylinder is used for penetrating through the steel stranded wire and fixedly connecting with the groove on the surface of the concrete through pouring; the low-retraction anchor ring is arranged at the bottom of the deep-buried casing and is in tensioning connection with each steel strand through a pre-tightening clamping piece; the low-retraction nut is rotatably matched with the external thread of the low-retraction anchor ring and is in tensioning connection with the bottom of the connecting deep-buried casing;
the secondary tensioning structure is arranged outside the groove on the surface of the poured precast concrete and comprises a reverse wire tensioning rod, a reverse wire rear anchor nut, a forward and reverse wire connecting nut and a jack; the front end of the reverse wire tension rod is connected with the reverse wire internal thread of the forward and reverse wire connecting nut through the reverse wire thread, and the forward wire internal thread at the other end of the forward and reverse wire connecting nut is connected with the low-retraction anchor ring of the primary tension structure through the forward thread; the other end of the reverse wire tension rod passes through the jack and is sleeved with a reverse wire back anchor nut to form a secondary tension structure.
The secondary tensioning structure is also provided with external supporting feet; the external supporting leg is a stress supporting device and is composed of a supporting leg upper steel plate and a supporting leg lower steel plate which are supported and fixed at two ends of a plurality of supporting leg upright posts, an opening in the center of the external supporting leg is used for enabling a reverse wire tension rod to freely pass through, the supporting leg lower steel plate is supported and arranged on the outer surface of a concrete groove, and the supporting leg upper steel plate is supported and arranged on a jack.
The positive and negative screw connecting nuts are large and small diameter internal screw nuts, and the large and small diameter internal screw nuts are positive screw internal screw threads or reverse screw internal screw threads respectively.
The positive and negative wire connecting nut is characterized in that 1/2 of the axial length is a positive wire, the other 1/2 of the axial length is a negative wire, the negative wire end is connected with a negative wire tension rod, and the positive wire end is connected with a low-retraction anchor ring.
The low-retraction nut is a hexagonal nut and is driven to rotate through a hexagonal torsion sleeve with the length being longer than the depth of the groove on the surface of the concrete.
The torsion sleeve is formed by welding six rectangular steel plates and is used for sleeving the low-retraction nut and driving the low-retraction nut to rotate and screw up through wrench torsion.
The spiral steel bar of the anchoring structure is 4-6 circles and is arranged below the anchor cup, and the anchor cup is in a horn mouth shape and is arranged in alignment with the pipeline.
The jack is a through jack, the anti-wire tension rod penetrates through the center of the jack, the bottom of the jack is arranged on the external supporting feet, and the external supporting feet provide counter force.
The reverse wire tension rod is a hollow alloy steel pipe manufactured by surface threading; the machining length is greater than or equal to the sum of the deep anchor sleeve, the external supporting feet, the jack length, the elongation and the height of the anchor nut after the back wire is turned.
The back anchor nut is round after further reversing the silk, installs at the back silk tension rod terminal part, and the outside sets up four nut pinholes and is used for screwing up.
The utility model adopts the tension rod to replace the conventional secondary tensioning steel strand, can more rapidly perform centering installation, and simultaneously better complete the integral secondary tensioning of the low-retraction anchor.
According to the secondary tensioning structure of the deeply-buried low-retraction anchor, the deeply-buried protective cylinder is arranged, the secondary tensioning support leg is arranged outside, the reinforcing steel bar bypasses the deeply-buried protective cylinder, tensioning operation in a narrow space is realized, cutting and reinforcing of the reinforcing steel bar are avoided, and secondary tensioning of the low-retraction anchor is efficiently completed.
Drawings
FIG. 1 is a schematic view of a secondary tensioning structure of a deeply buried low-retraction anchor of the present utility model;
FIG. 2 is a schematic top view of the back-threaded anchor nut of the present utility model;
FIG. 3 is a schematic cross-sectional view of the back-threaded anchor nut of the present utility model;
FIG. 4 is a schematic front view of the steel plate on the external supporting leg of the utility model;
FIG. 5 is a schematic front view of the external support leg lower steel plate of the present utility model;
FIG. 6 is a schematic top view of an external temple stand of the present utility model;
FIG. 7 is a schematic top view of the torsion sleeve structure of the present utility model;
FIG. 8 is a schematic elevational view of the torsion sleeve structure of the present utility model;
FIG. 9 is a schematic elevational cross-sectional view of a deep anchor casing of the present utility model;
FIG. 10 is a schematic top view of a deep anchor casing of the present utility model;
FIG. 11 is a schematic top view of the positive and negative wire coupling nut of the present utility model;
FIG. 12 is a schematic rear view of a positive and negative wire connection nut of the present utility model;
fig. 13 is a schematic cross-sectional view of a positive and negative wire coupling nut of the present utility model.
Reference numerals illustrate: the concrete pile comprises the following components of a 1-reverse wire tension rod, a 2-reverse wire rear anchor nut, a 201-nut pin hole, a 202-reverse wire screw thread, a 3-jack, a 4-external supporting leg, a 401-supporting leg upper steel plate, a 402-supporting leg upright post, a 403-supporting leg lower steel plate, a 404-upright post stiffening steel plate, a 405-upright post pin hole, a 5-torsion sleeve, a 501-steel plate, a 502-welding seam, a 6-anchor cup, a 7-spiral steel bar, an 8-steel strand, a 9-low retraction anchor ring, a 10-low retraction nut, a 11-deep-buried protective sleeve, 1101-bolt holes, a 12-forward and reverse wire connecting nut, 1201-reverse wire screw threads, 1202-nut pin holes, 1203-forward wire screw threads, 13-clamping pieces and 14-concrete.
Detailed Description
The present utility model will be further described with reference to the following specific embodiments, which are intended to be illustrative of the principles of the present utility model and not in any way limiting, nor will the same or similar techniques be used in connection with the present utility model beyond the scope of the present utility model.
In combination with the accompanying drawings.
The utility model discloses a deep-buried low-retraction anchor tensioning structure which consists of a reverse wire tensioning rod 1, a reverse wire rear anchor nut 2, a jack 3, external supporting feet 4, a torsion sleeve 5, an anchor cup 6, a spiral reinforcing steel bar 7, a steel strand 8, a low-retraction anchor ring 9, a low-retraction nut 10, a deep-buried protective cylinder 11, a positive and negative wire connecting nut 12, clamping pieces 13 and concrete 14.
The reverse wire tension rod 1, the reverse wire back anchor nut 2 and the forward and reverse wire connecting nut 12 are all made of alloy steel. The external supporting feet 4, the torsion sleeve 5 and the deep-buried protective cylinder 11 are all made of Q235 steel plates.
The reverse wire tension rod 1 is a hollow steel pipe, and the diameter of the reverse wire tension rod 1 is set according to the tension control force.
The external supporting leg 4 comprises an external supporting leg upper steel plate 401, an external supporting leg upright post 402, an external supporting leg lower steel plate 403, an upright post rib plate 404, an upright post pin hole 405 and an upright post stiffening steel plate 406.
The torsion sleeve 5 is welded by a steel plate 501 to form a regular hexagonal cylindrical structure.
The low-retraction nut 10 is used for fixing the low-retraction anchor ring, the patterns are more, and the torsion sleeve 5 is matched with the patterns of the low-retraction nut 10 during selection and installation.
The utility model relates to a secondary tensioning structure of a deeply buried low-retraction anchor, which comprises the following loading sequences of tensioning control stress values: the stress of each round is carried for 5min after being loaded by 0 sigma con-0.5 sigma con-1 sigma con.
The application and construction implementation process of the secondary tensioning structure of the deeply buried low-retraction anchor device is as follows:
1. as shown in fig. 1, in the concrete structure construction section, a deep-buried protective cylinder 11 is connected with an anchor cup 6 by adopting bolts and is welded and fixed with a main column rib of a bridge, after the strength and the elastic modulus of concrete 14 meet the requirements, a low-retraction nut 10 is rotated to the middle position of a low-retraction anchor ring 9, and a steel strand 8 is sleeved; and then sequentially installing a clamping piece 13, a limiting plate, a jack 3, a tool anchor and the like, completing the first tensioning, and cutting off the redundant steel strand 8.
2. As shown in fig. 1, after the prestressed steel bundles are tensioned for 24-48 hours for the first time, the reverse wire tension rod 1 and the reverse wire connecting nut 12 are installed, and the reverse wire tension rod 1 is rotated to drive the reverse wire connecting nut 12 to rotate inwards until the reverse wire tension rod 1 is screwed on the low-retraction anchor ring 9.
3. As shown in fig. 1, 4, 5 and 6, the external supporting leg 4 is composed of an external supporting leg upper steel plate 401, an external supporting leg upright post 402, an external supporting leg lower steel plate 403, an external supporting leg upright post rib plate 404, an upright post pin hole 405 and an upright post stiffening steel plate 406, which are all connected by full welding.
4. As shown in fig. 1, 7, 8, a torsion sleeve 5 is installed to nest on the low-retraction nut 10.
5. As shown in fig. 1, the external supporting feet 4 and the jack 3 pass through the reverse wire tension rod 1, and then the reverse wire back anchor nut 2 is installed.
6. As shown in fig. 1, the positions of the jack 3 and the external supporting leg 4 are adjusted so that the axes of the jack and the external supporting leg 4 are on the same straight line with the central line of the opposite wire tension rod 1, and the opposite wire back anchor nut 2 is screwed down to fix the positions of the jack 3 and the external supporting leg 4.
7. The jack 3 is started, and the outward stretching force is transmitted to the low-retraction anchor ring 9 by the reverse wire stretching rod 1, so that the whole secondary stretching of the low-retraction anchor ring 9 is completed.
8. After the tension prestress control value is reached, the torsion sleeve 5 is screwed down by a spanner after the tension prestress control value is held for 5min, and the low-retraction nut 10 is driven to be screwed down and locked on the anchor cup 6.
9. Thus, secondary tensioning of the deeply buried low-retraction anchor is completed, and the secondary tensioning devices are sequentially removed according to the reverse installation sequence.
Claims (10)
1. The utility model provides a low anchor stretch-draw structure that contracts deeply which characterized in that: comprises an anchoring structure, a primary tensioning structure and a secondary tensioning structure;
the anchoring structure includes: pouring an anchor cup and a spiral steel bar which are fixedly connected in the concrete, wherein a plurality of steel strands are arranged, one end of each steel strand is fixedly connected with an anchor rod which is fixedly poured in the concrete, and the other end of each steel strand penetrates through the spiral steel bar and the anchor cup to be connected with a primary tension structure;
the stretch-draw structure once sets up in pouring prefabricated concrete surface recess, includes: a deep-buried casing, a low-retraction anchor ring and a low-retraction nut; the bottom opening of the deep-buried protective cylinder is used for penetrating through the steel stranded wire and fixedly connecting with the groove on the surface of the concrete through pouring; the low-retraction anchor ring is arranged at the bottom of the deep-buried casing and is in tensioning connection with each steel strand through a pre-tightening clamping piece; the low-retraction nut is rotatably matched with the external thread of the low-retraction anchor ring and is in tensioning connection with the bottom of the connecting deep-buried casing;
the secondary tensioning structure is arranged outside the groove on the surface of the poured precast concrete and comprises a reverse wire tensioning rod, a reverse wire rear anchor nut, a forward and reverse wire connecting nut and a jack; the front end of the reverse wire tension rod is connected with the reverse wire internal thread of the forward and reverse wire connecting nut through the reverse wire thread, and the forward wire internal thread at the other end of the forward and reverse wire connecting nut is connected with the low-retraction anchor ring of the primary tension structure through the forward thread; the other end of the reverse wire tension rod passes through the jack and is sleeved with a reverse wire back anchor nut to form a secondary tension structure.
2. The deep-buried low-retraction anchor tension structure of claim 1 wherein: the secondary tension structure is also provided with external supporting feet; the external supporting leg is a stress supporting device and is composed of a supporting leg upper steel plate and a supporting leg lower steel plate which are supported and fixed at two ends of a plurality of supporting leg upright posts, an opening in the center of the external supporting leg is used for enabling a reverse wire tension rod to freely pass through, the supporting leg lower steel plate is supported and arranged on the outer surface of a concrete groove, and the supporting leg upper steel plate is supported and arranged on a jack.
3. The deep-buried low-retraction anchor tension structure of claim 2 wherein: the positive and negative wire connecting nuts are large and small diameter internal thread nuts, and the large and small diameter internal threads are positive wire internal threads or reverse wire internal threads respectively.
4. A deep-buried low-retraction anchor tension structure according to claim 3 wherein: the positive and negative wire connecting nut is internally provided with a positive wire with 1/2 axial length, and the positive wire with 1/2 axial length is internally provided with a negative wire, the negative wire end is connected with a negative wire tension rod, and the positive wire end is connected with a low-retraction anchor ring.
5. The deep-buried low-retraction anchor tension structure of claim 2 wherein: the low-retraction nut is a hexagonal nut and is driven to twist by a hexagonal torsion sleeve with the length longer than the depth of the groove on the surface of the concrete.
6. The deep-buried low-retraction anchor tension structure according to claim 5 wherein: the torsion sleeve is formed by welding six rectangular steel plates and is used for sleeving the low-retraction nut and driving the low-retraction nut to rotate and screw up through wrench torsion.
7. The deep-buried low-retraction anchor tension structure of claim 2 wherein: the spiral steel bar of the anchoring structure is 4-6 circles and is arranged below the anchor cup, and the anchor cup is in a horn mouth shape and is arranged in a centering way with the pipeline.
8. The deep-buried low-retraction anchor tension structure of claim 2 wherein: the jack is a through jack, the anti-silk tension rod passes through from the center, the bottom of the jack is arranged on the external supporting feet, and the external supporting feet provide counter force.
9. The deep-buried low-retraction anchor tension structure of claim 2 wherein: the reverse wire tension rod is a hollow alloy steel pipe manufactured by surface threading; the machining length is greater than or equal to the sum of the deep anchor sleeve, the external supporting feet, the jack length, the elongation and the height of the anchor nut after the back wire is turned.
10. The deep-buried low-retraction anchor tension structure of claim 2 wherein: the back anchor nut is round, is arranged at the tail end part of the back wire tension rod, and is provided with four nut pin holes at the outer side for screwing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321109384.1U CN219824903U (en) | 2023-05-10 | 2023-05-10 | Deep-buried low-retraction anchor tensioning structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321109384.1U CN219824903U (en) | 2023-05-10 | 2023-05-10 | Deep-buried low-retraction anchor tensioning structure |
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| Publication Number | Publication Date |
|---|---|
| CN219824903U true CN219824903U (en) | 2023-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321109384.1U Active CN219824903U (en) | 2023-05-10 | 2023-05-10 | Deep-buried low-retraction anchor tensioning structure |
Country Status (1)
| Country | Link |
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| CN (1) | CN219824903U (en) |
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- 2023-05-10 CN CN202321109384.1U patent/CN219824903U/en active Active
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