CN109653531B - External prestress steel strand connector and matched tensioning device - Google Patents
External prestress steel strand connector and matched tensioning device Download PDFInfo
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- CN109653531B CN109653531B CN201910068991.XA CN201910068991A CN109653531B CN 109653531 B CN109653531 B CN 109653531B CN 201910068991 A CN201910068991 A CN 201910068991A CN 109653531 B CN109653531 B CN 109653531B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 78
- 239000010959 steel Substances 0.000 title claims abstract description 78
- 230000002787 reinforcement Effects 0.000 abstract description 24
- 238000010276 construction Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 7
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 9
- 239000004567 concrete Substances 0.000 description 8
- 238000000338 in vitro Methods 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 4
- 238000004873 anchoring Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000007789 sealing 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
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
-
- 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
- E04G21/121—Construction of stressing jacks
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses an external prestress steel strand connector and a matched tensioning device, which are suitable for external prestress reinforcement construction of a building structure, the magnitude of prestress tension is regulated by regulating the screw thread entering quantity between a front threaded sleeve and a back threaded sleeve and a screw, and the external prestress steel strand connector is combined with the matched tensioning device to be used, so that the problems that tensioning cannot be carried out and friction loss is too large at two reinforced ends of the external prestress steel strand due to limitation are solved, the aim of regulating prestress at any time according to the load in the reinforcement process is fulfilled, the construction is convenient, the engineering cost is reduced, and the external prestress steel strand connector is suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, relates to a steel strand connector, and in particular relates to an in-vitro prestress steel strand connector and a matched tensioning device.
Background
In building construction, external prestress reinforcement is one of important modes for reinforcing a concrete structure. Unlike conventional post-tensioned bonded or unbonded prestressing structural reinforcement, in-vitro prestressing structural reinforcement is a reinforcement technique in which prestressing steel strands are arranged outside the cross section of the structural body to exert prestressing.
Although the external prestress reinforcement technology has the advantages of definite stress, simple and convenient construction, convenient maintenance and repair and the like in the reinforcement and reconstruction engineering of the concrete structure, the adoption of the external prestress reinforcement in the construction at the present stage has the following technical problems:
(1) The external prestress steel strand is provided with a jack when the end part is anchored because of no tensioning space;
(2) Because the length of the prestressed steel strand exceeds 60m (even reaches 100 m), the prestress friction loss of the middle section is larger when the end part is tensioned, and therefore the middle part of the external prestressed steel strand needs to be tensioned in a segmented way;
(3) In the external prestress reinforcement process, the size of prestress cannot be adjusted at any time according to the size of load.
Therefore, how to provide an external prestress wire connector and a matched tensioning device capable of solving the above defects is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides an external prestress wire connector and a matched tensioning device with simple structure and convenient operation.
In order to achieve the above object, the present invention provides the following technical solutions:
an in vitro pre-stressed steel strand connector, comprising: the anchor device comprises an anchor device, a clamping piece, a screw rod and a front and back threaded sleeve; wherein, two ends of the positive and negative thread sleeve are respectively connected with the screw rod through screw threads; one end of the screw rod, which is far away from the front and back threaded sleeve, is connected with the anchor; the clamping piece is inserted into the anchor device and is abutted against the anchor device.
By adopting the technical scheme, the invention has the beneficial effects that: the external prestress steel strand connector disclosed by the invention can be used for adjusting the prestress tension by adjusting the screw thread entering quantity between the positive and negative threaded sleeve and the screw, so that the steel strand connector can be used for increasing the tension and reducing the tension, has the same connecting function as a conventional connector, and can be used for achieving the purposes of tension and tension adjustment.
In addition, by adopting the traditional sectional lapping mode, the prestressed steel strand needs to be lapped for a certain length, so that the consumption of the external prestressed steel strand is increased, and the anchoring position needs to be locally reinforced when the end part is tensioned, thereby increasing extra cost. Compared with the traditional sectional lapping, the invention not only reduces the local stress of the lapping on the concrete structure, but also reduces the construction cost, thereby being suitable for popularization and application.
Preferably, one end of the anchor is connected with the prestress steel strand through the clamping piece, and the other end of the anchor is connected with the screw through a screw thread.
Through the technical scheme, the invention has the technical effects that: one end of the anchor disclosed by the invention is connected with the prestress steel strand through the clamping piece, the other end of the anchor is connected with the screw rod through the screw thread, and the clamping piece clamps and anchors the prestress steel strand under the action of tension force.
Another object of the present invention is to provide a tensioning device compatible with the external pre-stressed steel strand connector described above.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the external prestress steel strand tensioning device is sleeved outside the external prestress steel strand connector and comprises a tensioning transverse plate, a base plate, a tensioning pull rod, a jack and a tensioning anchor;
it should be noted that the tensioning anchor is a tool anchor that is movable with the jack, and the anchor of the connector assembly is capable of acting in combination with the external pre-stressed steel strand for structural reinforcement.
The tensioning transverse plate is abutted with the anchor, a round hole I is formed in the top of the tensioning transverse plate, and a long groove which is coaxial with the round hole is formed in the bottom of the tensioning transverse plate;
the top of the backing plate is provided with a short groove, and the bottom of the backing plate is provided with a round hole II coaxial with the short groove;
the tensioning anchorage device and the jack are symmetrically positioned at two ends of the external prestress steel strand connector, and the tensioning anchorage device is arranged at one side of the tensioning transverse plate or the backing plate; the jack is arranged on the other side of the stretching transverse plate or the backing plate;
it is worth noting that the backing plate is placed outside the tensioning transverse plate and corresponds to the notch of the tensioning transverse plate, and the purpose of installing the backing plate is to fix the tensioning transverse plate and the backing plate into a whole through two bolts so as to carry out tensioning.
The tension rod is positioned in the middle of the tension transverse plate and comprises an upper tension rod and a lower tension rod; the upper tension pull rod is movably connected with the tension transverse plate through the first round hole, and the lower tension pull rod is movably connected with the tension transverse plate through the second round hole; and an external prestress steel strand is inserted into a groove hole formed by the long groove and the short groove.
Through the technical scheme, the invention has the technical effects that: the external prestress steel strand stretching device disclosed by the invention is mainly arranged outside the prestress steel strand connector anchorage device through the stretching transverse plate and the backing plate, the problem that the stretching and friction loss is too large due to limitation at the two reinforced ends of the external prestress steel strand can not be solved through the combined use of the stretching device and the steel strand connector, the purposes of adjusting prestress at any time according to the load in the reinforcing process and being convenient to construct are realized, the manufacturing cost can be reduced, and the external prestress steel strand stretching device is suitable for popularization and application.
It should be noted that the common specification of the prestress wire isThe steel strand has tensile strength of fptk=1860 MPa, is high strength relaxed and has cross section area ap=140 mm 2 The breaking force of the single steel strand reaches 1860×140= 260400 n=26 tons. The steel strand is used for external prestress reinforcement of a concrete structure, has the advantages of steel saving and simple construction, and can control the tensile force to be 0.50 fptk-0.70 fptk during tensioning, and the corresponding tensile force of a single steel strand is about 13 tons-18 tons at the moment, so that the reinforcement effect is obvious.
Preferably, the tensioning transverse plate is abutted with the anchorage device.
Through the technical scheme, the invention has the technical effects that: according to the invention, the tensioning transverse plate is abutted with the anchorage device, and the tensioning device is sleeved outside the steel strand connector, so that the tensioning device and the connector are jointly used in the external prestress reinforcement process, the prestress can be adjusted at any time according to the load, the local stress of overlap joint on the concrete structure can be reduced, and the method has great market application and popularization values.
Preferably, the two sides of the long groove or the short groove are provided with round holes III, and fixing pieces are inserted into the round holes III.
Through the technical scheme, the invention has the technical effects that: the diameter of the round hole III is 8mm, the tensioning transverse plate and the backing plate are fixed into a whole through the mounting bolts so as to be convenient for tensioning, and the backing plate is easy to detach after tensioning is finished, and construction is convenient.
Preferably, the width of the stretching transverse plate is consistent with that of the backing plate, and the positions of the short groove and the round hole II are corresponding to that of the long groove.
Through the technical scheme, the invention has the technical effects that: the diameter of the first round hole is 16mm, and the steel stranded wire with the diameter of 15.2mm penetrating through the first round hole and the second round hole is defined as a tension rod.
In addition, the width of the long groove is consistent with that of the short groove, the width of the long groove is 16mm, and the purpose of arranging the grooves on the stretching transverse plate and the backing plate is to clamp the prestress steel twisted wire in the grooves for external prestress reinforcement of the concrete structure.
Preferably, one end of the upper tension rod passes through the tension transverse plate to be connected with the tension anchor, and the other end of the upper tension rod passes through the tension transverse plate to be connected with the jack.
Through the technical scheme, the invention has the technical effects that: the tension rods disclosed by the invention adopt steel strands with the diameter of 15.2mm, the breaking force is 26 tons, the total actual tension force value of the two tension rods is 18 tons at maximum, the tension forces of the upper tension rod and the lower tension rod are equal, the tension forces of the upper tension rod and the lower tension rod are not more than 10 tons, and the safety coefficient is high.
Preferably, one end of the lower tension rod sequentially penetrates through the tension transverse plate and the base plate to be connected with the tension anchor, and the other end of the lower tension rod sequentially penetrates through the tension transverse plate and the base plate to be connected with the jack.
Through the technical scheme, the invention has the technical effects that: the invention discloses a jack which is a through jack, and the specification parameters are as follows: the tensile force F is 13 tons, the diameterThe hydraulic oil pump is matched, so that the tension value can be read in real time, and the external prestress reinforcement can be accurately finished.
Compared with the prior art, the invention discloses an external prestress steel strand connector and a matched tensioning device, which have the following advantages:
1. the external prestress steel strand connector disclosed by the invention can adjust the prestress tension by adjusting the screw thread entering quantity between the positive and negative thread sleeve and the screw rod, thereby not only playing a role in connection, but also achieving the purposes of tensioning and tension adjustment;
2. the invention solves the problems that the two ends of the external prestress steel strand cannot be tensioned and the friction loss is too large because of limitation by combining the tensioning device with the steel strand connector, realizes the purposes of adjusting prestress at any time according to the load size in the reinforcing process and is convenient to construct, reduces the manufacturing cost and is suitable for popularization and application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a drawing showing the external prestress tension state of the invention.
Fig. 2 is a drawing showing the completion state of the external prestress tensioning according to the present invention.
FIG. 3 is a drawing showing an in vitro prestressed steel strand and connector assembly of the present invention in an exploded view.
Fig. 4 is a schematic structural view of the tensioning cross plate of the present invention.
FIG. 5 is a schematic view of the structure of the pad of the present invention.
FIG. 6 is a schematic diagram of the connection and tensioning process of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses an external prestress steel strand connector and a matched tensioning device, which have the advantages of simple structure, convenient operation, reduced local stress of lap joint on a concrete structure, more convenient construction and suitability for popularization and application.
An in vitro pre-stressed steel strand connector as shown in fig. 3, comprising: two anchors 1, two clamping pieces 2, two screws 3 and a front and back threaded sleeve 4; wherein, the two ends of the front and back thread sleeve 4 are respectively connected with the screw rod 3 through screw threads; one end of the screw rod 3 far away from the front and back thread sleeve 4 is in threaded connection with the anchor 1; the clamping piece 2 is inserted into the anchor 1 and is abutted against the anchor 1; one end of the anchor 1 is connected with a prestress steel strand 5 through a clamping piece 2, and the other end of the anchor 1 is connected with a screw rod 3 through screw threads.
An external prestress steel strand stretching device is matched with the external prestress steel strand connector, and the external prestress steel strand connector is arranged in the stretching device, as shown in figures 1 and 4-5; the device comprises a tensioning transverse plate 6, a base plate 7, a tensioning rod, a jack and a tensioning anchor.
The tensioning transverse plate 6 is abutted with the anchorage device 1, and the tensioning transverse plate 6 comprises a tensioning transverse plate I61 and a tensioning transverse plate II 62; the top of the stretching transverse plate 6 is provided with a round hole I11, and the bottom is provided with a long groove 12 coaxial with the round hole I11;
the backing plate 7 is consistent with the width of the stretching transverse plate 6, is arranged on one side of the stretching transverse plate 6, and comprises a backing plate I71 and a backing plate II 72; the top of the backing plate 7 is provided with a short groove 13, and the bottom of the backing plate is provided with a round hole II 14 coaxial with the short groove 13; wherein the positions of the short groove 13 and the round hole II 14 are corresponding to the long groove 12;
the tensioning anchors and the jacks are symmetrically positioned at two ends of the external prestress steel strand connector, and the tensioning anchors comprise a tensioning anchor I101 and a tensioning anchor II 102; a first tensioning anchor 101 is arranged on one side of the first tensioning transverse plate 61, and a second tensioning anchor 102 is arranged on one side of the first backing plate 71;
the jack comprises a first jack 91 and a second jack 92; the first jack 91 is arranged on one side of the tensioning transverse plate II 62, and the second jack 92 is arranged on one side of the backing plate II 72;
the tension rod is positioned in the middle of the tension transverse plate and comprises an upper tension rod 81 and a lower tension rod 82; the upper tension rod 81 is movably connected with the tension transverse plate 6 through a first round hole 11, and the lower tension rod 82 is movably connected with the tension transverse plate 6 through a second round hole 14; the external prestress steel strand is inserted into the groove hole formed by the long groove 12 and the short groove 13.
One end of the upper tension rod 81 passes through the first tension transverse plate 61 to be connected with the first tension anchor 101, and the other end of the upper tension rod 81 passes through the second tension transverse plate 62 to be connected with the first jack 91; one end of the lower tension rod 82 sequentially passes through the first tension transverse plate 61 and the first base plate 71 to be connected with the second tension anchor 102, and the other end of the lower tension rod 82 sequentially passes through the second tension transverse plate 62 and the second base plate 72 to be connected with the second jack 92.
In order to further optimize the technical scheme, round holes III 15 are formed in two sides of the long groove 12 or the short groove 13, and fixing pieces are inserted into the round holes III 15.
The external prestress steel strand connector and the matched tensioning device are applied to an external prestress reinforced concrete structure, and the connection and tensioning process is shown in fig. 6, and specifically comprises the following steps:
the first step: left and right reinforcement according to the length and the extension of the external prestress steel strandCutting off the end of the steel strand and reserving a clear distance D between the end 0 ；
Wherein D is 0 Designing the total length D of the connector according to the total length L, the tensile force F and the total length D of the steel strand 1 Clamping length D of clamping piece j The sectional area of the steel strand is determined as A, the elastic modulus is determined as E, and the tensile elongation value after the loss is considered by the tensile force F is determined as follows: Δ= αf×l/(a×e), where α is about 0.85.
If the total length of the steel strand for reinforcement is 70000mm, F=150000N, A=140 mm 2 ，E＝1.95×105N/mm 2 It is possible to obtain: Δ= 0.85×150000×70000/(140×1.95×105) =327 mm connector design length D 1 Length L of each anchor holding strand =600 mm 1 50mm, giving:
D 0 ＝D 1 +△-2L 1 ＝600+327-50×2＝827mm。
step two: an anchor is arranged at the end part of the steel strand for reinforcement, and the steel strand for reinforcement is clamped by a clamping piece;
step three: the other end of the anchor is provided with a screw rod, the steel stranded wires for reinforcement are sequentially clamped into the long groove of the tensioning transverse plate and the short groove of the backing plate, and the tensioning transverse plate and the backing plate are fixed into an integral structure through bolts;
step four: one diameter is set asThe steel strand of (2) is inserted into the round hole I of the tension cross plate, and the other steel strand is inserted into the round hole I of the tension cross plate>The steel strands are sequentially inserted into the long grooves of the tensioning transverse plates and the round holes II of the backing plates, and the steel strands are anchored and fixed on the left side of the tensioning device through tensioning anchors;
step five: the right side of the tensioning device is provided with a jack for tensioning, the left section and the right section of steel strands for reinforcement are connected through the positive and negative threaded sleeve while tensioning, the screw thread entering quantity between the positive and negative threaded sleeve and the screw rod is regulated, the tensioning force value is read through a hydraulic oil pump matched with the jack, the tensioning is stopped when the tensioning force reaches a set value, and meanwhile the elongation value of the steel strands for reinforcement is measured for checking.
In order to further illustrate the excellent effects achieved by the technical solutions disclosed in the present invention, the following application examples are listed:
the transverse direction of a certain project is 6 spans 11m, the total length is 66m, the longitudinal direction is 7 spans 11.25m, the total length is 78.75m, external prestress reinforcement is adopted, and the length of the prestress steel strand reaches 78m.
On the one hand, if the outer side of the structure is externally decorated, the external prestress is stretched on the outer side of the structure, and then devices such as an anchor device, an anchor sealing device and the like are additionally arranged on the outer side of the structure, so that extra cost is increased, and the building model is damaged; on the other hand, because the prestress loss of the 78m long steel strand is larger, and the technical regulations of unbonded prestress concrete structure prescribe that the prestress steel strand needs to be stretched and anchored in sections when exceeding 60m, the stretching and anchoring mode not only increases the consumption and construction difficulty of the external prestress steel strand, but also improves the construction cost. Therefore, in summary, the external prestress steel strand connector and the matched tensioning device disclosed by the invention can be used for tensioning, so that the optimal design and construction scheme can be realized, and a good tensioning and reinforcing effect can be obtained.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (3)
1. The external prestress steel strand tensioning device is characterized by being matched with an external prestress steel strand connector, and the external prestress steel strand connector is arranged in the tensioning device;
the tensioning device includes: the device comprises a tensioning transverse plate, a base plate, a tensioning rod, a jack and a tensioning anchor;
the tensioning transverse plate is abutted with the anchor, a round hole I is formed in the top of the tensioning transverse plate, and a long groove which is coaxial with the round hole is formed in the bottom of the tensioning transverse plate;
the top of the backing plate is provided with a short groove, and the bottom of the backing plate is provided with a round hole II coaxial with the short groove;
the tensioning anchorage device and the jack are symmetrically positioned at two ends of the external prestress steel strand connector, and the tensioning anchorage device is arranged at one side of the tensioning transverse plate or the backing plate; the jack is arranged on the other side of the stretching transverse plate or the backing plate;
the tension rod is positioned in the middle of the tension transverse plate and comprises an upper tension rod and a lower tension rod; the upper tension pull rod is movably connected with the tension transverse plate through the first round hole, and the lower tension pull rod is movably connected with the tension transverse plate through the second round hole; an external prestress steel strand is inserted into a groove hole formed by the long groove and the short groove;
round holes III are formed in two sides of the long groove or the short groove, and fixing pieces are inserted into the round holes III;
the width of the stretching transverse plate is consistent with that of the base plate, and the positions of the short groove and the second round hole are corresponding to that of the long groove.
2. The external prestress wire tensioning device according to claim 1, wherein one end of the upper tension rod penetrates through the tensioning transverse plate to be connected with the tensioning anchor, and the other end of the upper tension rod penetrates through the tensioning transverse plate to be connected with the jack.
3. The external prestress wire tensioning device according to claim 1, wherein one end of the lower tension rod sequentially penetrates through the tensioning transverse plate and the base plate to be connected with the tensioning anchor, and the other end of the lower tension rod sequentially penetrates through the tensioning transverse plate and the base plate to be connected with the jack.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910068991.XA CN109653531B (en) | 2019-01-24 | 2019-01-24 | External prestress steel strand connector and matched tensioning device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910068991.XA CN109653531B (en) | 2019-01-24 | 2019-01-24 | External prestress steel strand connector and matched tensioning device |
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| CN109653531B true CN109653531B (en) | 2024-02-09 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111706086B (en) * | 2020-06-19 | 2021-12-17 | 威胜利工程有限公司 | Clamping piece mounting auxiliary |
| CN113047523B (en) * | 2021-05-12 | 2021-11-16 | 中建八局第二建设有限公司 | Prestressed steel pull rod for truss steel beam node support |
| CN113684769B (en) * | 2021-08-03 | 2023-01-13 | 江阴法尔胜住电新材料有限公司 | Temporary buckling cable force adjusting device for construction of bilateral cantilever type main beam and using method thereof |
| CN113565146B (en) * | 2021-08-12 | 2022-06-10 | 武大巨成结构股份有限公司 | Prestress tensioning system for basement anti-floating construction |
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| WO2014146366A1 (en) * | 2013-03-19 | 2014-09-25 | 苏州市能工基础工程有限责任公司 | Clamping piece-type anchorage for prestressed tendon |
| CN205077877U (en) * | 2015-10-30 | 2016-03-09 | 南京工业大学 | Unbonded prestressed tendon repeated tensioning device |
| KR20180005796A (en) * | 2016-07-07 | 2018-01-17 | 주식회사그라운드이엔씨 | Ground reinforcement fixing apparatus and method for construction |
| CN209760863U (en) * | 2019-01-24 | 2019-12-10 | 中冶建筑研究总院有限公司 | External prestress steel strand connector and matched tensioning device |
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- 2019-01-24 CN CN201910068991.XA patent/CN109653531B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR200182611Y1 (en) * | 1999-12-08 | 2000-05-15 | 박재만 | Apparatus to restrain prestress structure |
| CN101748898A (en) * | 2010-01-21 | 2010-06-23 | 武汉二航路桥特种工程有限责任公司 | Method for implementing the middle connection tensioning of cables and device thereof |
| WO2014146366A1 (en) * | 2013-03-19 | 2014-09-25 | 苏州市能工基础工程有限责任公司 | Clamping piece-type anchorage for prestressed tendon |
| CN205077877U (en) * | 2015-10-30 | 2016-03-09 | 南京工业大学 | Unbonded prestressed tendon repeated tensioning device |
| KR20180005796A (en) * | 2016-07-07 | 2018-01-17 | 주식회사그라운드이엔씨 | Ground reinforcement fixing apparatus and method for construction |
| CN209760863U (en) * | 2019-01-24 | 2019-12-10 | 中冶建筑研究总院有限公司 | External prestress steel strand connector and matched tensioning device |
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