CN110616898B - Prestressed tendon unloading device - Google Patents
Prestressed tendon unloading device Download PDFInfo
- Publication number
- CN110616898B CN110616898B CN201910678242.9A CN201910678242A CN110616898B CN 110616898 B CN110616898 B CN 110616898B CN 201910678242 A CN201910678242 A CN 201910678242A CN 110616898 B CN110616898 B CN 110616898B
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- China
- Prior art keywords
- fixing frame
- frame
- limiting
- tendon
- unloading device
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- 210000002435 tendon Anatomy 0.000 title claims abstract description 59
- 238000006073 displacement reaction Methods 0.000 claims description 14
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000004873 anchoring Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention belongs to the technical field of engineering construction, and particularly relates to a prestressed tendon unloading device which comprises a first fixing frame and a second fixing frame which are arranged at intervals, wherein a movable frame is arranged between the first fixing frame and the second fixing frame, a power source drives the movable frame to reciprocate towards or away from the first fixing frame and the second fixing frame respectively between the first fixing frame and the second fixing frame, clamping units used for limiting the prestressed tendons to relatively move with each frame are arranged on the first fixing frame, the second fixing frame and the movable frame respectively, and constraint units for maintaining the distance between the first fixing frame, the second fixing frame and the movable frame are arranged between the first fixing frame and the second fixing frame. The invention completely changes the traditional operation mode of taking the anchoring position as the power source abutting surface, the unloading is not limited by the reserved length of the anchoring end, the invention can be applied to any prestressed tendon in a stress state, the application range is wide, the unloading device has simple structure, and the transportation, the assembly and the disassembly are convenient.
Description
Technical Field
The invention belongs to the technical field of engineering construction, and particularly relates to a prestressed reinforcement unloading device.
Background
In the unbonded prestressed component, the prestressed tendons and the concrete have no binding force, and the tensile force of the prestressed tendons is completely transmitted to the component by an anchorage device, and the common application is bridge stay cables and external cables.
In the prior art, the unbonded prestress component usually adopts prestress ribs with outer jackets, the outer jackets are required to be stripped at the two ends of the prestress ribs, so that the steel strands are exposed out to be in direct contact with and meshed with the clamping pieces, the steel strands at the end parts are arranged in a protective cap filled with an anti-corrosion medium to realize the anti-corrosion of the steel strands, and the working length of the prestress ribs for secondary tensioning is reserved in the protective cap. However, when the unbonded prestressing technique is applied, the extension length of the prestressing tendons when the prestressing tendons are tensioned to the designed tension force is long, if the length of the protective cap is increased synchronously, the cost is greatly increased, the structure in the member is compact, and often enough space is not available for accommodating the elongated prestressing tendons, so the overlong prestressing tendons are generally cut off at present, the anchoring of the prestressing tendons in a small space is realized, but when the prestressing tendons are replaced, the length of the prestressing tendons which can be released is directly caused to be insufficient, the tensioning force applied by the prestressing tendons cannot be completely removed, and unexpected risks are caused when the prestressing tendons are cut off under the condition of negative load, and equipment in the structure is extremely easily damaged or casualties are caused.
Disclosure of Invention
The invention aims to provide a prestress rib unloading device which can safely unload the load of a strip-shaped rope-shaped component.
The prestress rib unloading device comprises a first fixing frame and a second fixing frame which are arranged at intervals, a movable frame is arranged between the first fixing frame and the second fixing frame, a power source drives the movable frame to reciprocate towards or away from the first fixing frame and the second fixing frame respectively between the first fixing frame and the second fixing frame, clamping units used for limiting the prestress rib to move relative to the first fixing frame and the second fixing frame are arranged on the first fixing frame and the second fixing frame respectively, and constraint units for maintaining the distance between the first fixing frame and the second fixing frame and between the movable frames are arranged between the first fixing frame and the second fixing frame.
Compared with the prior art, the invention has the following technical effects that the space between the two frame bodies is maintained by the constraint unit, the relative displacement between the two frame bodies and the prestressed tendons is respectively limited, the load of the prestressed tendons can be reliably borne, the safety accidents caused by the sudden release of the load of the prestressed tendons are effectively avoided, and the unloading operation of the prestressed tendons is safely carried out. The traditional operation mode of taking the anchoring position as a power source abutting surface is completely changed, unloading is not limited by the reserved length of the anchoring end, the unloading device can be applied to any prestressed tendon in a stressed state, the application range is wide, the unloading device is simple in structure, and convenient to transport, assemble and disassemble.
Drawings
The contents expressed in the drawings of the present specification and the marks in the drawings are briefly described as follows:
FIG. 1 is a schematic illustration of the present invention;
fig. 2, 3, 4 are schematic diagrams of the clamping unit.
In the figure, a first fixing frame, a first lifting lug, a second fixing frame, a movable frame, a 40 rod or rope, a 50 clamping unit, a 51 limiting hole, a 511 notch, a 52 clamping piece and a 60 jack.
Detailed Description
The following describes the embodiments of the present invention in further detail by way of examples with reference to the accompanying drawings.
The prestress rib unloading device comprises a first fixing frame 10 and a second fixing frame 20 which are arranged at intervals, a movable frame 30 is arranged between the first fixing frame 10 and the second fixing frame 20, and a constraint unit for maintaining the distance between the first fixing frame 10, the second fixing frame 20 and the movable frame 30 is arranged between the first fixing frame 10 and the second fixing frame 20. The restraint unit can prevent that mount 10, mount two 20, arbitrary two of movable frame 30 from taking place the displacement under prestressing tendons A's drive when using, prestressing tendons A drive support body arbitrary displacement and influence equipment and life safety when avoiding restraint cable section release.
The first fixing frame 10, the second fixing frame 20 and the movable frame 30 are respectively provided with a clamping unit 50 for limiting the relative displacement of the prestressed tendons A and the respective frames, and when in actual use, the prestressed tendons A are arranged in a straight line, so that the clamping units are arranged on the same straight line at intervals. The clamping unit is detachably matched and connected with the prestressed tendon A.
The restraint unit comprises a power source, and the power source drives the movable frame 30 to reciprocate between the first fixing frame 10 and the second fixing frame 20 towards or away from the first fixing frame 10 and the second fixing frame 20 respectively. In this embodiment, as shown in fig. 1, only one movable frame 30 is provided, and in the implementation, the positions of the first fixing frame 10 and the second fixing frame 20 are maintained unchanged, the relative displacement of any one fixing frame, the movable frame 30 and the tendon a is limited, after the tendon a between the two fixing frames is disconnected, the movable frame 30 is driven to drive the tendon a to displace towards the side of the other fixing frame, so that part or all of the load on the tendon a can be removed. In another embodiment, two movable frames 30 are disposed between the first and second fixing frames 10, 20, so that after the tendon A is sheared, the two movable frames 30 can be driven to displace toward the near side fixing frames respectively at the same time, and the unloading speed can be further improved.
Specifically, the clamping unit 50 includes a limiting hole 51 with an open side, and the clamping piece 52 is clamped between the limiting hole 51 and the tendon a to limit the axial and radial displacement of the tendon a and the limiting hole 51. The clamping piece 52 is coated or looped on the periphery of the tendon A, and the maximum outer diameter of the clamping piece 52 is larger than the maximum inner diameter of the limiting hole 51, so that when the clamping piece 52 is clamped or clamped between the limiting hole 51 and the tendon A, the tendon A can be meshed or locked, and the displacement of the tendon A is limited.
Preferably, as shown in fig. 2, the frame body is provided with a limiting seat 53, the limiting seat 53 is provided with a limiting hole 51, and in other embodiments, the limiting hole 51 may also be directly formed on the frame body. The side wall of the limit hole 51 is provided with a notch 511 which penetrates through the limit hole in the axial direction, and the gap interval of the notch 511 is larger than the outer diameter of the prestressed tendon A so as to enable the prestressed tendon A to pass through. The clamping piece 52 is inserted into the limiting hole 51 to shield the notch 511, when the limiting device is used, the prestress rib A is guided to enter the limiting hole 51 from the notch 511, and then the clamping piece 52 is installed to shield the notch 511 so that the gap interval is smaller than the outer diameter of the prestress rib A, so that the prestress rib A can be effectively prevented from falling out of the limiting hole 51, and the reliability of pulling limiting is guaranteed. As shown in fig. 2 and 3, to ensure reliable engagement of the tendon a with the limiting hole 51, a baffle 54 is disposed outside the notch 511 to prevent the clip 52 from being removed from the limiting hole 51, and the baffle 54 can further enhance the restraint of the tendon a by the clamping unit 50. In the embodiment shown in fig. 2, clip 52 completely covers the inner rim of gap 511 and baffle 54 completely covers the outer rim of gap 511.
Preferably, as shown in fig. 4, two limiting seats 53 are respectively arranged on each frame body, cambered surfaces 531 are respectively arranged on the inner sides of the limiting seats 53 to enclose the hole walls of the limiting holes 51, the power source drives each limiting seat 53 to make a distance between the edges of the action adjusting cambered surfaces 531 in the radial direction, and the maximum distance between the edges of the cambered surfaces 531 is larger than the outer diameter of the prestressed tendons A so as to enable the prestressed tendons A to pass through. The clamping pieces 52 are inserted into the limiting holes 51 at intervals along the edges of the shielding cambered surfaces 531. When the prestress rib A is used, the prestress rib A is guided to enter the inner side of the limiting seat 53 from the interval between the cambered surfaces 531, then the limiting seat 53 is driven to perform approaching motion in the radial direction, the clamping piece 52 is inserted into the limiting hole 51 to form limiting fit with the prestress rib A, and the prestress rib A is prevented from falling out of the limiting hole 51.
It should be further noted that, as long as the inner edges of two adjacent clips 52 are smaller than the outer diameter of the tendon a, and the spacing between the outer edges of the individual clips 52 is larger than the maximum spacing between the side openings of the limiting holes 51, the tendon a can be prevented from falling out of the limiting holes 51.
Preferably, the whole limiting hole 51 is conical, when the clamping piece 52 clamps the prestress rib A to move towards the small-aperture end of the limiting hole 51, the clamping force is increased, and when the clamping piece 52 and the prestress rib A move towards the large-aperture end of the limiting hole 51, the clamping force is reduced until the clamping piece 52 and the prestress rib A are separated. The large-aperture ends of the two limiting holes 51 positioned on the first fixing frame 10 and the second fixing frame 20 are arranged on the adjacent sides of the two limiting holes, and the small-aperture ends are arranged on the far sides of the two limiting holes. A jack 60 is arranged between the movable frame 30 and the second fixed frame 20, and the arrangement mode of the limiting holes 51 on the movable frame 30 is the same as that of the limiting holes 51 on the second fixed frame 20. In other embodiments, other mechanisms or devices such as a screw-nut mechanism, a hydraulic cylinder, etc. may be used in place of the jack 15 to drive the displacement of the clamping unit 50.
Further, the slope of the outer peripheral wall of the clamping piece 52 is consistent with the slope of the hole wall of the limit hole 51, the curvature of the inner peripheral wall is smaller than or equal to the curvature of the outer peripheral wall of the prestress rib A, and the clamping piece 52 is divided into two or more valve bodies along the circumferential direction.
Preferably, the movable frame 30 is displaced under the guide of the rod or the cable 40, the movable frame 30 is sleeved on the rod or the cable 40 and forms sliding fit with the rod or the cable 40, and the first fixing frame 10 and the second fixing frame 20 are respectively arranged at two ends of the rod or the cable 40. The first fixing frame 10 and the second fixing frame 20 are respectively and fixedly connected with the rod or the cable 40 to maintain the distance between the two fixing frames, in this embodiment, the jack 60 connecting the movable frame 30 and the second fixing frame 20 can drive the movable frame 30 to displace and maintain the distance between the movable frame 30 and the fixing frames, and the rod or the cable 40 and the jack 60 connected with the beam body cooperate to form a constraint unit for constraining the distance between the frame bodies.
Further, the connection position of the first fixing frame 10 and the second fixing frame 20 with the rod or the cable 40 is adjusted through the locking adjusting unit, when the locking adjusting unit is in the adjusting position, the first fixing frame 10 and the second fixing frame 20 relatively displace to adjust the distance between the first fixing frame and the second fixing frame under the guide of the rod or the cable 40, and when the locking adjusting unit is in the locking position, the first fixing frame 10 and the second fixing frame 20 are fixedly connected with the rod or the cable 40 respectively.
Preferably, lifting lugs 11 are arranged on the first fixing frame 10 and/or the second fixing frame 20, so that the lifting equipment is convenient to install and transport the unloading device.
It should be further noted that the constraint unit in the method has the following effects:
First, the clamping unit 50 is driven to displace, and the displacement stroke of the clamping unit 50 is changed according to the selection of the driving mechanism. In this embodiment, the displacement stroke of the clamping unit 50 is the displacement stroke of the jack 60.
Second, the interval between the clamping units 50 is maintained. In this embodiment, the maximum distance between the clamping units 50 is defined by the length of the rod or the cable 40, and when the rod is used, the distance between the two fixing beams will always be at the maximum distance, the distance between the two clamping units 50 respectively located on the two fixing beams will always maintain the maximum distance, and when the cable is used, the distance between the two fixing beams will gradually decrease along with the unloading of the tendon A, and the clamping units 50 located on the two fixing beams are also the same. When the jack 60 is in the locked state, the distance between the movable frame 30 and the first fixed frame 10 is maintained, so that the distance between the clamping units 50 on the movable frame 30 and the two clamping units 50 on the two fixed frames is maintained.
The maximum spacing of the clamping units 50 should be equal to or greater than the extension of the tendon a, i.e., the length of the rod or cable 40 is related to the extension of the tendon a, and when the extension of the tendon a is large, the length of the rod or cable 40 should be correspondingly lengthened.
In other embodiments, other shapes or configurations of the bar or cable 40, such as a plate, may be used in place of the bar or cable to define the maximum spacing between the clamping units 50 and to effect installation of the power source. In this embodiment, the first fixing frame 10, the second fixing frame 20, and the movable frame 30 are in the shape of a strip, and in other embodiments, the first fixing frame 10, the second fixing frame 20, and the movable frame 30 may be adaptively selected from other shapes or structures such as a block.
Third, guiding is provided for displacement of the clamping unit 50. In this embodiment, the clamping unit 50 is disposed on a horizontal fixed frame or a movable frame, the two fixed frames are respectively connected with a vertically disposed rod or cable 40, the movable frame 30 is sleeved on the rod or cable 40 and forms a sliding fit with the rod or cable 40, and the rod or cable in a stretched state provides a guide for the displacement of the movable frame 30.
Claims (7)
1. The prestress rib unloading device is characterized by comprising a first fixing frame (10) and a second fixing frame (20) which are arranged at intervals, wherein a movable frame (30) is arranged between the first fixing frame (10) and the second fixing frame (20), a constraint unit for maintaining the distance between the first fixing frame (10), the second fixing frame (20) and the movable frame (30) is arranged between the first fixing frame (10) and the second fixing frame (20), the constraint unit comprises a power source, the power source drives the movable frame (30) to do close or far-away reciprocating motion between the first fixing frame (10) and the second fixing frame (20) respectively, and clamping units (50) for limiting the prestress rib (A) to move relative to each fixing frame are arranged on the first fixing frame (10), the second fixing frame (20) and the movable frame (30) respectively;
the movable frame (30) is displaced under the guide of the rod or the rope (40), the movable frame (30) is sleeved on the rod or the rope (40) and forms sliding fit with the rod or the rope, and the first fixing frame (10) and the second fixing frame (20) are respectively arranged at two ends of the rod or the rope (40);
The first fixing frame (10) and the second fixing frame (20) are connected with the rod or the rope (40) through a locking adjusting unit and realize adjustment of the connection position, when the locking adjusting unit is in an adjusting position, the first fixing frame (10) and the second fixing frame (20) are relatively displaced and adjusted under the guide of the rod or the rope (40), and when the locking adjusting unit is in a locking position, the first fixing frame (10) and the second fixing frame (20) are fixedly connected with the rod or the rope (40) respectively.
2. The tendon unloading device as claimed in claim 1, characterized in that the clamping unit (50) includes a side opening limiting hole (51), and the clamping piece (52) is clamped between the limiting hole (51) and the tendon (A) to limit the axial and radial displacement of the tendon (A) and the limiting hole (51).
3. The tendon unloading device as claimed in claim 2, characterized in that limiting holes (51) are formed in limiting seats (53) formed in each frame body or each frame body, gaps (511) penetrating through the limiting holes in the axial direction are formed in the side walls of the limiting holes (51), the gap spacing between the edges of the gaps (511) is larger than the outer diameter of the tendon (A), and clamping pieces (52) are inserted into the limiting holes (51) to shield the gaps (511).
4. The prestressed tendon unloading device as claimed in claim 2, wherein each frame body is provided with a limiting seat (53), an arc surface (531) is arranged on the inner side of each limiting seat (53) to enclose the hole wall of each limiting hole (51), the power source drives each limiting seat (53) to make a distance close to or far away from the edge of the action adjusting arc surface (531) in the radial direction, the maximum distance of the edge of the arc surface (531) is larger than the outer diameter of the prestressed tendon (A), and the clamping piece (52) is inserted into the limiting hole (51) to shield the edge distance of the arc surface (531).
5. The prestressed tendon unloading device according to claim 2, wherein the limiting holes (51) are integrally conical, the large-aperture ends of the two limiting holes (51) on the first fixing frame (10) and the second fixing frame (20) are arranged on the adjacent sides of the two limiting holes, the small-aperture ends of the two limiting holes are arranged on the far sides of the two limiting holes, a jack (60) is arranged between the movable frame (30) and the second fixing frame (20), and the arrangement mode of the limiting holes (51) on the movable frame (30) is the same as that of the limiting holes (51) on the second fixing frame (20).
6. The tendon unloading device as claimed in claim 5, characterized in that the slope of the outer peripheral wall of the clamping piece (52) is matched with the slope of the wall of the limit hole (51), the curvature of the inner peripheral wall is smaller than or equal to the outer peripheral curvature of the tendon (A), and the clamping piece (52) is divided into two or more petals along the circumferential direction.
7. The prestressed tendon unloading device according to claim 1, wherein lifting lugs (11) are arranged on the first fixing frame (10) and/or the second fixing frame (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910678242.9A CN110616898B (en) | 2019-07-25 | 2019-07-25 | Prestressed tendon unloading device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910678242.9A CN110616898B (en) | 2019-07-25 | 2019-07-25 | Prestressed tendon unloading device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110616898A CN110616898A (en) | 2019-12-27 |
| CN110616898B true CN110616898B (en) | 2024-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910678242.9A Active CN110616898B (en) | 2019-07-25 | 2019-07-25 | Prestressed tendon unloading device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110616898B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205242852U (en) * | 2015-12-10 | 2016-05-18 | 北京巧力神金属结构有限公司 | Non - punching ground tackle |
| CN206655710U (en) * | 2017-04-06 | 2017-11-21 | 中铁七局集团第四工程有限公司 | Anchor-hold is moved back in tensioning |
| CN210598176U (en) * | 2019-07-25 | 2020-05-22 | 威胜利工程有限公司 | Prestressed reinforcement unloading device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202194135U (en) * | 2011-07-18 | 2012-04-18 | 中铁西北科学研究院有限公司深圳南方分院 | Anchor cable prestress load compensation or unloading device |
| CN103244160B (en) * | 2013-05-20 | 2015-05-13 | 河北联合大学 | Detachable reused single-pore clamping piece type anchor rope anchorage device |
| CN208981794U (en) * | 2018-10-25 | 2019-06-14 | 中国十九冶集团有限公司 | Prestressed anchorage cable stop device |
-
2019
- 2019-07-25 CN CN201910678242.9A patent/CN110616898B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205242852U (en) * | 2015-12-10 | 2016-05-18 | 北京巧力神金属结构有限公司 | Non - punching ground tackle |
| CN206655710U (en) * | 2017-04-06 | 2017-11-21 | 中铁七局集团第四工程有限公司 | Anchor-hold is moved back in tensioning |
| CN210598176U (en) * | 2019-07-25 | 2020-05-22 | 威胜利工程有限公司 | Prestressed reinforcement unloading device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110616898A (en) | 2019-12-27 |
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