CN211473434U - Hoop prestressing force device - Google Patents
Hoop prestressing force device Download PDFInfo
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- CN211473434U CN211473434U CN201922215245.7U CN201922215245U CN211473434U CN 211473434 U CN211473434 U CN 211473434U CN 201922215245 U CN201922215245 U CN 201922215245U CN 211473434 U CN211473434 U CN 211473434U
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Abstract
The utility model discloses a hoop prestressing force device is applied to the pier stud, including fixed anchor piece, stretch-draw anchor piece, hoop prestressing tendons and prestressing force stretch-draw muscle, the side at the pier stud is established to fixed anchor piece and stretch-draw anchor piece, and the right of fixed anchor piece is connected to the one end of hoop prestressing tendons, and the other end encircles the left side of connecting the stretch-draw anchor piece behind the pier stud, and the left side of fixed anchor piece and the right of stretch-draw anchor piece are connected respectively to the both ends of prestressing force stretch-draw muscle. The prestressed tendon of the utility model can form self-balancing anchoring, and is suitable for the middle and small diameter (the diameter is less than 2m) pier stud structure which is inconvenient to set the ear blocks of the anchoring end and the tensioning end; meanwhile, two ends of the steel can be tensioned, so that the prestress loss caused by friction is effectively reduced.
Description
Technical Field
The utility model relates to an anchor technical field especially relates to a hoop prestressing force device.
Background
The lateral restraint is carried out on the concrete, so that the strength and the ultimate compressive strain of the concrete can be obviously improved, the ductile deformation and the energy consumption capacity 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 hooped concrete is 'passive' constrained concrete, when the axial pressure of the concrete is small, the function of the constrained material is limited, and the core concrete is still in a uniaxial compression state; when the axial force is increased to a certain value, the core concrete is expanded transversely, and the constraint material can play a role to form annular constraint so that the structure is in a three-dimensional compression state.
The biggest difference of the hoop prestress constraint concrete is that the 'passive constraint' is changed into '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 lifted into a three-dimensional compression state. Along with the continuous increase of load, the concrete takes place horizontal inflation, and the hoop prestressing force provides bigger side direction restraint effect to the core concrete thereupon, and the concrete will be in stronger three-dimensional pressurized state to show ultimate strength and the ultimate strain who promotes the concrete. The hoop prestress can be adjusted to the effect of constraint by actively adjusting the prestress.
The existing hoop prestress needs to arrange special tensioning ends and anchoring end lug blocks in the structure for tensioning and anchoring prestressed tendons, and certain space is needed for arranging the lug blocks, so that the existing hoop 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 column structures with medium and small diameters (the diameter is less than 2m), the space is small, and the arrangement of the anchoring end and the tensioning end lug blocks is inconvenient.
When a plurality of annular ribs are anchored by the existing annular prestress device, the stress of the annular prestress rib is inevitably uneven due to the problem of the length manufacturing precision of each rib, the effect of the annular prestress is influenced due to the unevenness, and the failure of applying the annular prestress due to the overlarge stress of individual ribs is caused in serious cases.
In the existing annular prestress applying mode of the ear block type, the turning angle of the annular prestress rib is generally 120 degrees or 180 degrees, mainly because the great turning angle can bring about great prestress loss.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a hoop prestressing force device, the whole device can form self-balancing anchoring, and is suitable for a small and medium diameter (the diameter is less than 2m) pier stud structure which is inconvenient to set an anchoring end and a tensioning end ear block; meanwhile, two ends of the steel can be tensioned, so that the prestress loss caused by friction is effectively reduced.
The utility model discloses take following technical scheme to realize above-mentioned purpose:
the utility model provides a hoop prestressing force device, is applied to the pier stud, includes fixed anchor piece, stretch-draw anchor piece, hoop prestressing tendons and prestressing force stretch-draw muscle, 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 other end encircles the left side of connecting stretch-draw anchor piece behind the pier stud, and the left side of fixed anchor piece and the right of stretch-draw anchor piece are connected respectively to the both ends of prestressing force stretch-draw muscle.
Preferably, the fixed anchoring block is provided with a first threaded hole, the tensioning anchoring block is provided with a second threaded hole, and two ends of the annular prestressed tendon are respectively fixed on the hollow bolt and are respectively bolted to the first threaded hole and the second threaded hole through the hollow bolt.
Preferably, the tension anchor block is provided with a conical anchor cup, one end of the prestress tension 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 anchor blocks and the tension anchor blocks are arranged in parallel.
Preferably, the circumferential prestressed tendons are set to be n, n is a natural number greater than 2, and the prestressed tensioning tendons are set to be n-1; and the circumferential prestressed tendons and the prestressed tensioning tendons are perpendicular to the fixed anchoring blocks and are arranged at intervals along the fixed anchoring blocks.
The utility model has the advantages that:
(1) the utility model discloses a pier stud structure need not set up anchor end and stiff end ear piece specially, and current hoop prestressing force needs to set up special tensioning end and anchor end ear piece in the structure and is used for stretch-draw anchor prestressing tendons, arranges that the ear piece needs certain space, and consequently current hoop prestressing force technique is applied to major diameter structure more. The utility model discloses well fixed anchor piece and stretch-draw anchor piece become an organic whole through the self-balancing anchor mode after being connected respectively with hoop prestressing tendons and prestressing force tensioning muscle for prefabricated processing, can effectively improve the efficiency of construction.
(2) The annular prestressed tendons and the prestressed tensioning tendons form self-balancing anchoring, the prestressed tendons can be tensioned at two ends, friction loss between the prestressed tendons and the structure can be effectively reduced, and the prestress application effect is improved.
(3) The hollow bolt can adjust the stress uniformity of the plurality of annular prestressed tendons, and can solve the problem that the applied prestress fails or the effect does not reach the expectation due to the uneven stress of the plurality of annular prestressed tendons.
Drawings
Fig. 1 is a schematic view of the general installation state of the hoop prestressing device provided by the present invention;
fig. 2 is a top view of the hoop prestressing device provided by the present invention;
fig. 3 is a schematic structural view of a fixed anchoring block in the hoop prestressing device provided by the present invention;
fig. 4 is a sectional view of the position of the hoop prestressed tendons in the hoop prestressed device provided by the present invention;
fig. 5 is a schematic structural view of a tension anchor block in the hoop prestressing device provided by the present invention;
fig. 6 is a sectional view of the position of the prestressed tension bar in the hoop prestressed device provided by the present invention.
In the figure, 1-pier stud, 2-fixed anchor block, 3-tension anchor block, 4-circumferential prestressed tendon, 5-prestressed tension tendon, 6-first threaded hole, 7-second threaded hole, 8-hollow bolt, 9-conical anchor cup, 10-clamping piece and 11-connecting bolt.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings 1-6 and the detailed description thereof.
Please refer to fig. 1 and fig. 2 simultaneously, the embodiment of the present invention provides a hoop prestressing device for a pier stud 1, which comprises a fixed anchoring block 2, a tension anchoring block 3, a hoop prestressing tendon 4 and a prestressing tendon 5. The fixed anchoring block 2 and the tensioning anchoring block 3 are arranged on the side face of the pier stud 1, one end of the annular prestressed tendon 4 is connected with the right of the fixed anchoring block 2, the other end of the annular prestressed tendon 4 surrounds the pier stud 1 and then is connected with the left side of the tensioning anchoring block 3, and the two ends of the prestressed tensioning tendon 5 are respectively connected with the left side of the fixed anchoring block 2 and the right side of the tensioning anchoring block 3.
The utility model discloses a hoop prestressing force device is when using, and hoop prestressing tendons 4 and prestressing force stretch-draw muscle 5 anchor respectively in fixed anchor piece 2 and stretch-draw anchor piece 3, form a whole to reach the purpose of embracing pier stud 1 jointly, thereby apply hoop prestressing force to pier stud 1.
Further, please refer to fig. 3, fig. 4, fig. 5 and fig. 6 simultaneously, the fixed anchor block 2 is provided with a first threaded hole 6, the tension anchor block 3 is provided with a second threaded hole 7, and two ends of the circumferential prestressed tendon 4 are respectively fixed on a hollow bolt 8 and are respectively screwed in the first threaded hole 6 and the second threaded hole 7 through the hollow bolt 8. The hollow bolt 8 is used for eliminating the stress nonuniformity of the plurality of annular prestressed tendons 4. The method specifically comprises the following steps: the two ends of the hoop prestressed tendons 4 are fixed in the hollow positions of the hollow bolts 8 respectively, then the two hollow bolts 8 are screwed into the first threaded holes 6 of the fixed anchoring blocks 2 and the second threaded holes 7 of the tensioning anchoring blocks 3 respectively, the lengths of the fixed anchoring blocks 2 and the tensioning anchoring blocks 3 are screwed by adjusting the hollow bolts 8, the hoop prestressed tendons 4 can be tightly propped on the fixed anchoring blocks 2 and the tensioning anchoring blocks 3 respectively before tensioning prestressed, the working lengths of all the hoop prestressed tendons 4 are guaranteed to be the same while the hoop prestressed tendons 4 are in a tensioning state, the stress uniformity of the plurality of hoop prestressed tendons 4 can be adjusted, and the problem that the applied prestressed force fails or the effect does not reach the expected due to uneven stress of the plurality of hoop prestressed tendons 4 is solved.
Furthermore, 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 method specifically comprises the following steps: the prestressed tendon stretching device is adopted to stretch the prestressed stretching tendon 5, the front section of the stretching device supports the stretching anchoring block 3, the clamping piece 10 is pushed to enter the conical anchor cup 9 during stretching, the prestressed stretching tendon 5 is released after stretching to a certain load, and the clamping piece 10 is driven to form anchoring in the retraction process.
Further, the fixed anchoring blocks 2 and the tensioning anchoring blocks 3 are arranged in parallel, and the stress uniformity of the circumferential prestressed tendons 4 is further ensured.
Furthermore, the circumferential prestressed tendons 4 are set to be n, n is a natural number greater than 2, the prestressed tensioning tendons 5 are set to be n-1, the circumferential prestressed tendons 4 and the prestressed tensioning tendons 5 are perpendicular to the fixed anchoring blocks 2 and are arranged at intervals along the fixed anchoring blocks 2, and accordingly circumferential prestress is distributed evenly. The method specifically comprises the following steps: in this embodiment, the number of the circumferential tendons 4 is three, and the number of the prestressed tension tendons 5 is two.
The installation method of the hoop prestress device of the utility model comprises the following steps,
firstly, arranging a fixed anchoring block 2 and a tensioning anchoring block 3 on the side surface of a pier stud 1, and connecting the upper end and the lower end of the fixed anchoring block 2 and the upper end and the lower end of the tensioning anchoring block 3 by using connecting bolts 11, namely, the upper ends of the fixed anchoring block 2 and the tensioning anchoring block 3 are connected by using the connecting bolts 11, and the lower ends of the fixed anchoring block 2 and the tensioning anchoring block 3 are also connected by using the connecting bolts 11, so that the fixed anchoring block 2, the tensioning anchoring block 3 and the connecting bolts 11 form a balance system;
secondly, the hollow bolts 8 are respectively screwed in the first threaded holes 6 of the fixed anchoring blocks 2 and the second threaded holes 7 of the tensioning anchoring blocks 3 in the initial stage, two ends of the circumferential prestressed tendon 4 are respectively fixed in the hollow positions of the hollow bolts 8, the anchoring ends of the circumferential prestressed tendon 4 are respectively tightly propped against the fixed anchoring blocks 2 and the tensioning anchoring blocks 3 by respectively adjusting the screwing-out lengths of the hollow bolts 8, and meanwhile, the working lengths of the circumferential prestressed tendons 4 are ensured to be the same;
anchoring one end of a prestress tensioning rib 5 on the fixed anchoring block 2, and penetrating the other end of the prestress tensioning rib through the tensioning anchoring block 3;
step four, tensioning the prestressed tensioning tendon 5 by adopting a prestressed tendon tensioning device, wherein the front end of the tensioning device props up the tensioning anchoring block 3, the clamping piece 10 is pushed into the conical anchor cup 9 during tensioning, the prestressed tensioning tendon 5 is released after tensioning to a certain load, and the clamping piece 10 is driven to form anchoring in the retraction process;
and step five, dismantling the connecting bolts 11 and forming a final annular prestress applying state on the pier stud 1.
Although the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (5)
1. The utility model provides a hoop prestressing force device, be applied to pier stud (1), a serial communication port, including fixed anchor piece (2), stretch-draw anchor piece (3), hoop prestressing tendons (4) and prestressing force stretch-draw muscle (5), the side at pier stud (1) is established to fixed anchor piece (2) and stretch-draw anchor piece (3), the right of fixed anchor piece (2) is connected to the one end of hoop prestressing tendons (4), the other end encircles the left side of connecting stretch-draw anchor piece (3) behind pier stud (1), the left side of fixed anchor piece (2) and the stretch-draw right of anchor piece (3) are connected respectively to the both ends of prestressing force stretch-draw muscle (5).
2. The circumferential pre-stressing device according to claim 1, wherein the fixed anchor block (2) is provided with a first threaded hole (6), the tension anchor block (3) is provided with a second threaded hole (7), and two ends of the circumferential pre-stressing tendon (4) are respectively fixed on the hollow bolt (8) and are respectively screwed in the first threaded hole (6) and the second threaded hole (7) through the hollow bolt (8).
3. A hoop prestressing apparatus according to claim 1, wherein the tension anchor block (3) is provided with a cone-shaped anchor cup (9), and the prestressing tendons (5) are anchored at one end to the fixed anchor block (2) and at the other end to the cone-shaped anchor cup (9) by means of clips (10).
4. A hoop prestressing apparatus according to claim 1, wherein the anchor blocks (2) and the tension anchor blocks (3) are arranged in parallel.
5. A hoop prestressing apparatus according to claim 1, wherein the number of the hoop prestressing tendons (4) is n, n being a natural number greater than 2, and the number of the prestressing tendons (5) is n-1; and the annular prestressed tendons (4) and the prestressed tensioning tendons (5) are both perpendicular to the fixed anchoring blocks (2) and are arranged at intervals along the fixed anchoring blocks (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922215245.7U CN211473434U (en) | 2019-12-11 | 2019-12-11 | Hoop prestressing force device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922215245.7U CN211473434U (en) | 2019-12-11 | 2019-12-11 | Hoop prestressing force device |
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| CN211473434U true CN211473434U (en) | 2020-09-11 |
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| CN201922215245.7U Active CN211473434U (en) | 2019-12-11 | 2019-12-11 | Hoop prestressing force device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110821184A (en) * | 2019-12-11 | 2020-02-21 | 柳州欧维姆机械股份有限公司 | Circumferential prestress device and mounting method thereof |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110821184A (en) * | 2019-12-11 | 2020-02-21 | 柳州欧维姆机械股份有限公司 | Circumferential prestress device and mounting method thereof |
| CN110821184B (en) * | 2019-12-11 | 2023-09-12 | 柳州欧维姆机械股份有限公司 | Circumferential prestress device and mounting method thereof |
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