CN110821184B - Circumferential prestress device and mounting method thereof - Google Patents
Circumferential prestress device and mounting method thereof Download PDFInfo
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- CN110821184B CN110821184B CN201911266543.7A CN201911266543A CN110821184B CN 110821184 B CN110821184 B CN 110821184B CN 201911266543 A CN201911266543 A CN 201911266543A CN 110821184 B CN110821184 B CN 110821184B
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- tensioning
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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Abstract
The invention discloses a circumferential prestress device and an installation method thereof, which are applied to pier columns. The prestressed tendons can form self-balancing anchorage, and are suitable for small and medium diameter (diameter is smaller than 2 m) pier stud structures with inconvenient arrangement of anchorage ends and stretching end lugs; simultaneously, the two ends can be stretched, and the prestress loss caused by friction is effectively reduced.
Description
Technical Field
The invention relates to the technical field of anchoring devices, in particular to a circumferential prestress device and an installation method thereof.
Background
The concrete is laterally restrained, so that the strength and the ultimate compressive strain of the concrete can be obviously improved, the ductile deformation and the energy consumption capability of the structure can be improved during earthquake disasters, and the earthquake resistance of the structure is further improved. The existing common steel pipe and stirrup concrete is 'passive' constraint concrete, when the axial pressure of the concrete is smaller, the constraint material has limited effect, and the core concrete is in a single-shaft compression state; when the axial force is increased to a certain value, the core concrete transversely expands, and the constraint materials can play a role to form annular constraint, so that the structure is in a three-way compression state.
The greatest difference of the circumferential prestress constraint concrete is that the passive constraint is changed into the active constraint, the active constraint stress is provided for the core concrete, and the constraint material can play a role in advance, so that the core concrete is in a three-way compression state on the premise. Along with the continuous increase of the load, the concrete expands transversely, the circumferential prestress provides a larger lateral constraint effect for the core concrete, and the concrete is in a stronger three-way compression state, so that the ultimate strength and ultimate strain of the concrete are obviously improved. The circumferential prestress can be adjusted to the constraint effect by actively adjusting the prestress.
The existing circumferential prestress needs to be provided with special stretching ends and anchoring end ear blocks for stretching and anchoring the prestress ribs, and a certain space is needed for arranging the ear blocks, so that the existing circumferential prestress technology is mostly applied to large-diameter structures such as large-diameter silos, nuclear power station containment vessels, chimneys and the like. However, for pier stud structures with small and medium diameters (the diameter is smaller than 2 m), the space is small, and the anchor end and the stretching end lug blocks are inconvenient to set.
When the existing circumferential prestress device anchors a plurality of circumferential tendons, the stress of the circumferential prestress tendons is inevitably uneven due to the problem of manufacturing precision of the lengths of the tendons, the effect of circumferential prestress is affected by the uneven stress, and the circumferential prestress application fails due to overlarge stress of individual tendons in severe cases.
The existing annular prestress applying mode with the ear block type has the turning angle of 120 degrees or 180 degrees, and the larger prestress loss is mainly caused by the large turning angle.
Disclosure of Invention
In order to solve the problems, the invention provides a circumferential prestress device and an installation method thereof, wherein the whole device can form self-balancing anchoring and is suitable for small and medium diameter (diameter is smaller than 2 m) pier stud structures of an anchoring end and a stretching end ear block which are inconvenient to set; simultaneously, the two ends can be stretched, and the prestress loss caused by friction is effectively reduced.
The invention adopts the following technical scheme to realize the purposes:
the utility model provides a hoop prestressing device, is applied to the pier stud, includes fixed anchor piece, stretch-draw anchor piece, hoop prestressing tendons and prestressing tendons, and fixed anchor piece and stretch-draw anchor piece are established in the side of pier stud, and the right of fixed anchor piece is connected to the one end of hoop prestressing tendons, and the left of stretch-draw anchor piece is connected after the other end encircles the pier stud, and the left of fixed anchor piece and the right of stretch-draw anchor piece are connected respectively at the both ends of prestressing tendons.
Preferably, the fixed anchor block is provided with a first threaded hole, the tensioning anchor block is provided with a second threaded hole, and two ends of the circumferential prestress rib are respectively fixed on the hollow bolts and are respectively in threaded connection with the first threaded hole and the second threaded hole through the hollow bolts.
Preferably, the tensioning anchor block is provided with a conical anchor cup, one end of the prestress tensioning bar is anchored on the fixed anchor block), and the other end is anchored on the conical anchor cup through a clamping piece.
Preferably, the fixed anchor block and the tensioning anchor block are arranged in parallel.
Preferably, the number of the circumferential prestress ribs is n, n is a natural number greater than 2, and the number of the prestress tension ribs is n-1; and the circumferential prestressed tendons and the prestressed tensioning tendons are perpendicular to the fixed anchor blocks and are arranged at intervals along the fixed anchor blocks.
The installation method of the circumferential prestress device comprises the following steps,
the method comprises the steps that firstly, a fixed anchor block and a tensioning anchor block are arranged on the side face of a pier column, and the fixed anchor block and the tensioning anchor block are connected through a connecting bolt;
step two, respectively screwing the hollow bolts in a first threaded hole of the fixed anchor block and a second threaded hole of the tensioning anchor block in the initial stage, respectively fixing two ends of the annular prestressed tendons at the hollow positions of the hollow bolts, and respectively jacking and fastening the fixed anchor block and the tensioning anchor block by respectively adjusting the unscrewing lengths of the hollow bolts;
anchoring one end of the prestress tensioning bar on the fixed anchoring block, and enabling the other end of the prestress tensioning bar to penetrate through the tensioning anchoring block;
tensioning the prestress tensioning bar by adopting a prestress bar tensioning device, wherein the front end of the tensioning device props against a tensioning anchor block, pushing the clamping piece into the conical anchor cup while tensioning, and loosening the prestress tensioning bar after tensioning to a certain load, so that the clamping piece is driven to form an anchor in the retraction process;
and fifthly, removing the connecting bolts, and forming a final annular prestress application state for the pier column.
Preferably, in the first step, the upper and lower ends of the fixed anchor block and the tension anchor block are connected by connecting bolts.
Preferably, in the second step, the lengths of the hollow bolts screwed on the fixed anchor block and the tensioning anchor block are adjusted, so that the working lengths of the circumferential prestressed tendons are the same.
The beneficial effects of the invention are as follows:
(1) The pier stud structure does not need to be provided with an anchoring end and a fixed end lug block, the existing circumferential prestress needs to be provided with a special tensioning end and an anchoring end lug block for tensioning and anchoring the prestress rib, and a certain space is needed for arranging the lug blocks, so that the existing circumferential prestress technology is mostly applied to a large-diameter structure. According to the invention, the fixed anchor block and the tensioning anchor block are prefabricated, are respectively connected with the circumferential prestressed tendons and the prestressed tensioning tendons and then are integrated in a self-balancing anchoring manner, so that the construction efficiency can be effectively improved.
(2) The circumferential prestress rib and the prestress tensioning rib form self-balancing anchoring, the prestress rib can be tensioned at two ends, friction loss between the prestress rib and the structure can be effectively reduced, and the prestress applying effect is improved.
(3) The hollow bolt can adjust the stress uniformity of the plurality of circumferential prestressing tendons, and can solve the problem that the prestressing force application fails or the effect is not expected due to the uneven stress of the plurality of circumferential prestressing tendons.
Drawings
FIG. 1 is a schematic view of the overall installation state of the circumferential pre-stressing device according to the present invention;
FIG. 2 is a top view of the circumferential pre-stressing device according to the present invention;
FIG. 3 is a schematic structural view of a fixed anchor block in the circumferential prestressing device according to the present invention;
FIG. 4 is a cross-sectional view of a circumferential tendon in the circumferential prestressing device according to the present invention;
FIG. 5 is a schematic structural view of a tensile anchor block in the circumferential pre-stressing device provided by the invention;
fig. 6 is a sectional view of a position of a prestress tensioning bar in a circumferential prestress device provided by the invention.
In the figure, the steel column comprises a 1-pier stud, a 2-fixed anchor block, a 3-tensioning anchor block, a 4-circumferential prestressed tendon, a 5-prestressed tensioning tendon, a 6-first threaded hole, a 7-second threaded hole, an 8-hollow bolt, a 9-conical anchor cup, a 10-clamping piece and an 11-connecting bolt.
Detailed Description
The invention will now be described in detail with reference to figures 1-6 and the detailed description.
Referring to fig. 1 and 2, the embodiment of the invention provides a circumferential prestress device, which is applied to a pier column 1 and comprises a fixed anchor block 2, a tensioning anchor block 3, a circumferential prestress rib 4 and a prestress tensioning rib 5. The fixed anchor block 2 and the tensioning anchor block 3 are arranged on the side face of the pier column 1, one end of the circumferential prestress rib 4 is connected with the right side of the fixed anchor block 2, the other end of the circumferential prestress rib surrounds the pier column 1 and then is connected with the left side of the tensioning anchor block 3, and two ends of the prestress tensioning rib 5 are respectively connected with the left side of the fixed anchor block 2 and the right side of the tensioning anchor block 3.
When the circumferential prestress device is used, the circumferential prestress rib 4 and the prestress tensioning rib 5 are respectively anchored on the fixed anchor block 2 and the tensioning anchor block 3 to form a whole, so that the purpose of encircling the pier column 1 together is achieved, and circumferential prestress is applied to the pier column 1.
Further, referring to fig. 3, 4, 5 and 6, the fixed anchor block 2 is provided with a first threaded hole 6, the tensioned anchor block 3 is provided with a second threaded hole 7, and two ends of the circumferential tendon 4 are respectively fixed on a hollow bolt 8 and are respectively screwed with the first threaded hole 6 and the second threaded hole 7 through the hollow bolt 8. The hollow bolts 8 are used for eliminating the stress non-uniformity of the plurality of circumferential prestressing tendons 4. The method comprises the following steps: the two ends of the circumferential prestress rib 4 are respectively fixed at the hollow positions of the hollow bolts 8, then the two hollow bolts 8 are respectively screwed into the first threaded holes 6 of the fixed anchor block 2 and the second threaded holes 7 of the tensioning anchor block 3, the lengths of the hollow bolts 8 screwed on the fixed anchor block 2 and the tensioning anchor block 3 are adjusted, the circumferential prestress rib 4 can be respectively propped against the fixed anchor block 2 and the tensioning anchor block 3 before tensioning prestress, the circumferential prestress rib 4 is in a tensioning state, the working lengths of all the circumferential prestress ribs 4 are the same, and therefore the stress uniformity of the plurality of circumferential prestress ribs 4 can be adjusted, and the problem that the prestress applying failure or the effect caused by uneven stress of the plurality of circumferential prestress ribs 4 does not reach expectations is solved.
Further, a conical anchor cup 9 is arranged on the tensioning anchor block 3, one end of the prestress tensioning bar 5 is anchored on the fixed anchor block 2, and the other end is anchored on the conical anchor cup 9 through a clamping piece 10. The method comprises the following steps: the prestress tensioning device is used for tensioning the prestress tensioning bar 5, the front section of the tensioning device props against the tensioning anchor block 3, the clamping piece 10 is pushed into the conical anchor cup 9 while tensioning, the prestress tensioning bar 5 is loosened after tensioning to a certain load, and the clamping piece 10 is driven to form anchoring in the retraction process.
Further, the fixed anchor blocks 2 and the tensioning anchor blocks 3 are arranged in parallel, so that the stress uniformity of the circumferential prestress rib 4 is further ensured.
Further, the number of the circumferential prestressing tendons 4 is n, n is a natural number larger than 2, the number of the prestressing tendons 5 is n-1, the circumferential prestressing tendons 4 and the prestressing tendons 5 are perpendicular to the fixed anchoring blocks 2 and are arranged at intervals along the fixed anchoring blocks 2, and therefore circumferential prestressing force is distributed uniformly. The method comprises the following steps: in the present embodiment, three circumferential tendons 4 and two tendons 5 are provided.
The installation method of the circumferential prestress device comprises the following steps,
the method comprises the steps that firstly, a fixed anchor block 2 and a tensioning anchor block 3 are arranged on the side face of a pier column 1, the upper end and the lower end of the fixed anchor block 2 and the upper end of the tensioning anchor block 3 are connected through connecting bolts 11, namely the upper ends of the fixed anchor block 2 and the upper ends of the tensioning anchor block 3 are connected through the connecting bolts 11, the lower ends of the fixed anchor block 2 and the lower ends of the tensioning anchor block 3 are also connected through the connecting bolts 11, and the fixed anchor block 2, the tensioning anchor block 3 and the connecting bolts 11 form a balance system;
step two, the hollow bolts 8 are respectively screwed in the first threaded holes 6 of the fixed anchor blocks 2 and the second threaded holes 7 of the tensioning anchor blocks 3 in the initial stage, two ends of the circumferential prestressed tendons 4 are respectively fixed at the hollow positions of the hollow bolts 8, the anchoring ends of the circumferential prestressed tendons 4 are respectively fastened and fixed on the fixed anchor blocks 2 and the tensioning anchor blocks 3 by respectively adjusting the unscrewing lengths of the hollow bolts 8, and meanwhile, the working lengths of the circumferential prestressed tendons 4 are the same;
step three, one end of the prestress tensioning bar 5 is anchored on the fixed anchoring block 2, and the other end passes through the tensioning anchoring block 3;
tensioning the prestress tensioning bar 5 by adopting a prestress bar tensioning device, wherein the front end of the tensioning device props against the tensioning anchor block 3, pushing the clamping piece 10 into the conical anchor cup 9 while tensioning, and loosening the prestress tensioning bar 5 after tensioning to a certain load, so that the clamping piece 10 is driven to form an anchor in the retraction process;
and fifthly, removing the connecting bolts 11 to form a final annular prestress application state on the pier stud 1.
While the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (5)
1. The circumferential prestress device is applied to a pier column (1) and is characterized by comprising a fixed anchor block (2), a tension anchor block (3), circumferential prestress ribs (4) and prestress tension ribs (5), wherein the fixed anchor block (2) and the tension anchor block (3) are arranged on the side surface of the pier column (1), one end of the circumferential prestress ribs (4) is connected with the right side of the fixed anchor block (2), the other end of the circumferential prestress ribs surrounds the pier column (1) and is connected with the left side of the tension anchor block (3), and two ends of the prestress tension ribs (5) are respectively connected with the left side of the fixed anchor block (2) and the right side of the tension anchor block (3); the fixed anchor block (2) is provided with a first threaded hole (6), the tensioning anchor block (3) is provided with a second threaded hole (7), and two ends of the circumferential prestress rib (4) are respectively fixed on the hollow bolt (8) and are respectively connected with the first threaded hole (6) and the second threaded hole (7) in a threaded manner through the hollow bolt (8); a conical anchor cup (9) is arranged on the tensioning anchor block (3), one end of the prestress tensioning rib (5) is anchored on the fixed anchor block (2), and the other end is anchored on the conical anchor cup (9) through a clamping piece (10); the fixed anchor blocks (2) and the tensioning anchor blocks (3) are arranged in parallel.
2. The circumferential prestress device according to claim 1, characterized in that the circumferential tendons (4) are set to n, n is a natural number greater than 2, and the tendons (5) are set to n-1; and the circumferential prestress ribs (4) and the prestress tensioning ribs (5) are perpendicular to the fixed anchor blocks (2) and are arranged at intervals along the fixed anchor blocks (2).
3. The method for installing the circumferential prestress device according to claim 1, comprising the steps of firstly, arranging a fixed anchor block (2) and a tensioning anchor block (3) on the side surface of a pier column (1), and connecting the fixed anchor block (2) and the tensioning anchor block (3) by using a connecting bolt (11); step two, the hollow bolts (8) are respectively screwed in the first threaded holes (6) of the fixed anchor blocks (2) and the second threaded holes (7) of the tensioning anchor blocks (3) in the initial stage, two ends of the annular prestressed tendons (4) are respectively fixed at the hollow positions of the hollow bolts (8), and the anchoring ends of the annular prestressed tendons (4) are respectively fastened with the fixed anchor blocks (2) and the tensioning anchor blocks (3) in a jacking mode by respectively adjusting the unscrewing length of the hollow bolts (8); anchoring one end of the prestress tensioning bar (5) on the fixed anchoring block (2), and enabling the other end of the prestress tensioning bar to penetrate through the tensioning anchoring block (3); tensioning the prestress tensioning bar (5) by adopting a prestress bar tensioning device, wherein the front end of the tensioning device props against the tensioning anchor block (3), pushing the clamping piece (10) into the conical anchor cup (9) while tensioning, and loosening the prestress tensioning bar (5) after tensioning to a certain load, so that the clamping piece (10) is driven to form anchoring in the retraction process; and fifthly, removing the connecting bolts (11) to form a final annular prestress application state for the pier stud (1).
4. A method of installing a circumferential prestressing device according to claim 3, characterized in that in step one, the upper and lower ends of the fixed anchor block (2) and the tension anchor block (3) are connected by connecting bolts (11).
5. The method for installing the circumferential prestress device according to claim 3, wherein in the second step, the lengths of the fixed anchor block (2) and the tensioning anchor block (3) are screwed by adjusting the hollow bolts (8), so that the working lengths of the circumferential prestress ribs (4) are the same.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911266543.7A CN110821184B (en) | 2019-12-11 | 2019-12-11 | Circumferential prestress device and mounting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911266543.7A CN110821184B (en) | 2019-12-11 | 2019-12-11 | Circumferential prestress device and mounting method thereof |
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| CN110821184B true CN110821184B (en) | 2023-09-12 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6247279B1 (en) * | 1998-03-24 | 2001-06-19 | University Of Ottawa | Retrofitting existing concrete columns by external prestressing |
| CN102251684A (en) * | 2011-05-30 | 2011-11-23 | 北京交通大学 | Construction method for circumferential pretensioning steel strand reinforcement circular structure or construction member |
| KR101747112B1 (en) * | 2017-02-08 | 2017-06-15 | 한국건설기술연구원 | Fireproof improving and lateral reinforcing method for concrete column to introduce uniform pre-stress |
| CN107100091A (en) * | 2017-05-09 | 2017-08-29 | 浙江大学宁波理工学院 | The method of prestress steel twist gauze polymer mortar reinforced steel concrete ribbed arch bridge |
| CN107435293A (en) * | 2017-07-06 | 2017-12-05 | 东南大学 | Pre-stress FRP bar stretching and anchoring device and its construction method for precast assembly bridge pier |
| CN211473434U (en) * | 2019-12-11 | 2020-09-11 | 柳州欧维姆机械股份有限公司 | Hoop prestressing force device |
-
2019
- 2019-12-11 CN CN201911266543.7A patent/CN110821184B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6247279B1 (en) * | 1998-03-24 | 2001-06-19 | University Of Ottawa | Retrofitting existing concrete columns by external prestressing |
| CN102251684A (en) * | 2011-05-30 | 2011-11-23 | 北京交通大学 | Construction method for circumferential pretensioning steel strand reinforcement circular structure or construction member |
| KR101747112B1 (en) * | 2017-02-08 | 2017-06-15 | 한국건설기술연구원 | Fireproof improving and lateral reinforcing method for concrete column to introduce uniform pre-stress |
| CN107100091A (en) * | 2017-05-09 | 2017-08-29 | 浙江大学宁波理工学院 | The method of prestress steel twist gauze polymer mortar reinforced steel concrete ribbed arch bridge |
| CN107435293A (en) * | 2017-07-06 | 2017-12-05 | 东南大学 | Pre-stress FRP bar stretching and anchoring device and its construction method for precast assembly bridge pier |
| CN211473434U (en) * | 2019-12-11 | 2020-09-11 | 柳州欧维姆机械股份有限公司 | Hoop prestressing force device |
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