CN104675122B - Unbonded prestressing tendon controllable sectional anchor set and its assembly method and application - Google Patents
Unbonded prestressing tendon controllable sectional anchor set and its assembly method and application Download PDFInfo
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- CN104675122B CN104675122B CN201510067173.XA CN201510067173A CN104675122B CN 104675122 B CN104675122 B CN 104675122B CN 201510067173 A CN201510067173 A CN 201510067173A CN 104675122 B CN104675122 B CN 104675122B
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Abstract
The present invention relates to a kind of unbonded prestressing tendon controllable sectional anchor set and its assembly method and application, belong to prestressed reinforced concrete construction application field, including two-way anchor cup, left intermediate plate, spring, drag-line, right clamping piece, through hole is left at two-way anchor cup length direction axis, two-way anchor cup top sets vertical core；Left (right side) intermediate plate is 23 cone-shaped clips, and left (right side) intermediate plate afterbody sets oblique perforate otic placode, and its incline direction is opposite with the tapered direction of left bellmouth；Spring can be connected with left intermediate plate and the oblique perforate otic placode of right clamping piece afterbody；Drag-line runs through spring, vertical core of the drag-line two ends through two-way anchor cup；The purpose to the segmentation of many Span Continuous prestressed girders is realized by changing the working condition of controllable sectional anchorage, so realize reducing loss of prestress, avoid anchorage influence it is complete across and it is each across the target such as influence each other.
Description
Technical field
The present invention relates to a kind of unbonded prestressing tendon controllable sectional anchor set and its assembly method and application, belong to pre-
Prestressed concrete structural applications, are mainly used in the components such as the prestressing without bondn such as large-span structure, stadiums beam, plate.
Background technology
In recent years, with the development of construction technique, prestressed reinforced concrete construction is also developed rapidly, especially soap-free emulsion polymeization
Prestressed reinforced concrete construction, it has without reserving hole channel, is adapted to the complicated, component of curve cloth muscle；Easy construction；Can mend and open
Draw；The advantages of resistance to corrosion is strong is widely applied.
Often occur many Span Continuous prestressed girders in practical engineering application, its length there are tens meters of even rice up to a hundred, right
Using the continuous beam on many supports or floor of unbonded prestressing tendon, can be produced not in the case of no step-by-step arrangement, subsection tension
The influence of profit, is mainly shown as：
1) loss of prestress is big.The loss of the prestressing without bondn beam for tens meters even up to a hundred meters is very big, in advance should
The duct friction loss of power muscle is directly proportional to the length and girder span number of presstressed reinforcing steel, and presstressed reinforcing steel is more long, and friction loss is got over
Greatly, girder span number is more, and friction loss is bigger.Even if using two sections of stretch-draw prestressing forces, its loss of prestress also can be very big, especially
Many Span Continuous prestressed girders.
2) anchorage influence it is each across.Anchorage is the key that prestressing without bondn is set up and kept.To its security reliability, resistance to
Long property proposes requirement higher.The anchorage of unbonded prestressing tendon is on the outside of two end bay beams of continuous beam on many supports, and soap-free emulsion polymeization
Presstressed reinforcing steel can be in multispan beam slidably, such as one of anchorage fail when, continuous beam on many supports it is each across all
Can be affected, be destroyed because losing effective prestress, consequence is very serious.
3) often influenced each other between.One of the characteristics of prestressing without bondn beam is exactly unbonded prestressing tendon in multispan beam
In can be slidably, pair with many Span Continuous prestressed girders, a such as wherein span prestressed beam stress is larger and occur excessive
During deformation, influence whether other across prestressed girder stress and deformation；When a span prestressed beam is destroyed as in, can influence
To other across prestressed girder, or even the situation of continuous destruction can occur.
4) area lattice influence each other.For tens meters of prestressing without bondn multispan floor, when not being segmented, exist
Due to the floor temperature change of part area lattice it is big when, stress and the deformation of other area's lattice floors can be influenceed；Chain crack is produced to show
As.
At present, the segmentation of unbonded prestressing tendon is good solution, and its main method has：
1) presstressed reinforcing steel step-by-step arrangement.Many Span Continuous prestressed girders use the position of step-by-step arrangement, subsection tension, but segmentation
Need presstressed reinforcing steel to go out floor face tensioning or in the end tensioning of beam haunch, presstressed reinforcing steel length, haunch cost can be increased and applied
The work duration.
2) presstressed reinforcing steel connector.Each to be poured across segmentation, step-by-step arrangement, subsection tension, presstressed reinforcing steel uses connector
Connection, floor face or beam haunch tensioning are gone out without presstressed reinforcing steel, will not increase presstressed reinforcing steel length, but need to be segmented and poured, also together
Sample can increase cost and construction period.
In general, the segmentation problem of prestressing without bondn continuous beam on many supports is not yet well solved.For these
Problem, proposes prestressing without bondn continuous beam on many supports sectioning.
The content of the invention
Present invention aim at the segmentation problem for above-mentioned prestressing without bondn continuous beam on many supports or floor, it is proposed that one
Unbonded prestressing tendon controllable sectional anchor set and its assembly method and application are planted, it is mainly by unbonded prestressing tendon
Upper arrangement controllable sectional anchor set, can effectively solve the loss of prestress of above-mentioned prestressing without bondn continuous beam on many supports it is big,
Anchorage influence it is each across, each influenced each other between and the problems such as pre-stress floor area lattice influence each other.
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of unbonded prestressing tendon controllable sectional anchor set, including two-way anchor cup, left intermediate plate, spring, drag-line, right folder
Piece；The through hole that presstressed reinforcing steel is passed through is left at the two-way anchor cup length direction axis；Through hole at the two-way anchor cup inside center
With diameter greater than the through-hole diameter being served only for through presstressed reinforcing steel of two-way anchor cup arranged on left and right sides outer end；The two-way anchor cup
The bellmouth of bi-directional symmetrical is provided with inside center outside through hole arranged on left and right sides, be respectively arranged with left and right bellmouth left intermediate plate and
Right clamping piece；The left intermediate plate and right clamping piece are constituted by multi-disc cone-shaped clip, and cone-shaped clip taper with two-way anchor cup it is left,
Right bellmouth is mutually matched；Left intermediate plate and right clamping piece afterbody are provided with oblique perforate otic placode；The both ends of the spring respectively with a left side
Intermediate plate is connected with the oblique perforate otic placode of the afterbody of right clamping piece；The drag-line runs through the spring, and two-way anchor cup upper center sets
The vertical core that can pass through left intermediate plate, spring, drag-line and right clamping piece is equipped with, vertical core is connected with through hole at two-way anchor cup inside center,
Drag-line two ends both pass through the vertical core of two-way anchor cup；Wherein, spring contraction can be made during cable pull, a left side can be driven during spring contraction
Received in intermediate plate and right clamping piece, and then unclamp clamped presstressed reinforcing steel；Drag-line can extend spring when unclamping, and spring can when extending
Drive left intermediate plate and right clamping piece to extrapolate, and then clamp clamped presstressed reinforcing steel.
Further, the left intermediate plate and right clamping piece are constituted by 2-3 pieces cone-shaped clip.
Further, tapered direction of the oblique perforate otic placode incline direction respectively with left and right bellmouth is opposite.
Further, the vertical core be slot, its length direction along through hole direction, wherein, vertical core length be left folder
The length of piece or right clamping piece adds 50mm；Vertical core width is that left intermediate plate or right clamping piece surround diameter length plus 50mm.
Further, the symmetrical taper hole length of two-way anchor cup middle left and right is respectively left intermediate plate or the length of right clamping piece adds
50mm。
Further, the length that drag-line termination is stretched out after the vertical core of two-way anchor cup is 500mm~1000mm.
Further, the unbonded prestressing tendon controllable sectional anchor set is one or more, and is arranged in building knot
Structure beam-column joint core is interior or is arranged at the curve low spot of presstressed reinforcing steel.
The assembly method of above-mentioned unbonded prestressing tendon controllable sectional anchor set, step is as follows：
Step one：Left intermediate plate and right clamping piece are placed on corresponding left and right bellmouth through the vertical core above two-way anchor cup
It is interior；
Step 2：Drag-line is passed through into spring；
Step 3：Spring through the vertical core above two-way anchor cup is positioned over two-way anchor cup internal, at the same by spring with it is left
Intermediate plate is connected with the oblique perforate otic placode of the afterbody of right clamping piece, and drag-line two ends are stretched out into vertical core；
Step 4：By cable pull spring, by presstressed reinforcing steel through two-way anchor cup through hole, be set in spring with
And inside left intermediate plate and right clamping piece, then loosen drag-line.
Application of the above-mentioned unbonded prestressing tendon controllable sectional anchor set in many Span Continuous prestressed girders.
Device operation principle：Unbonded prestressing tendon controllable sectional anchor set point off position and working condition.No
Working condition --- tense in drag-line, spring contraction, left and right intermediate plate and receive, unclamp clamping presstressed reinforcing steel；Working condition --- unclamp
Drag-line, spring elongation, left and right intermediate plate extrapolation clamps clamping presstressed reinforcing steel.By change the working condition of controllable sectional anchorage come
Realize the purpose to the segmentation of many Span Continuous prestressed girders.And then realize reducing loss of prestress, avoid anchorage influence it is complete across and it is every
One across the target such as influence each other.
Beneficial effect：
1st, loss of prestress is reduced.In many Span Continuous prestressed girders, unbonded prestressing tendon controllable sectional anchor set,
In off position, the elongated tensioning of unbonded prestressing tendon multispan can be made, as other unbonded prestressing tendons；It is another
It is working condition, realizes the segmentation of many Span Continuous prestressed girders, friction loss can be reduced.
2nd, avoid anchorage influence it is each across.After prestressing force is set up, make controllable sectional anchor set in running order, keep away
Exempt from unbonded prestressing tendon in multispan beam slidably, realize the segmentation of many Span Continuous prestressed girders.Such as one of them
When anchorage fails, end bay prestressed girder can only be influenceed, not interfere with middle other span prestressed beams.
3rd, avoid often being influenced each other between.After prestressing force is set up, make controllable sectional anchor set in running order,
Avoid unbonded prestressing tendon in multispan beam slidably, realize the segmentation of many Span Continuous prestressed girders.Avoid wherein
One across the chain destruction caused after destruction.
4th, avoid being influenced each other between floor area lattice.After prestressing force is set up, controllable sectional anchor set is set to be in work
State, it is to avoid unbonded prestressing tendon in multispan continuous floor slidably, realize many Span Continuous pre-stress floors
Segmentation.Avoid chain crack or the destruction caused after wherein certain area lattice crack or destruction.
5th, prestressing force mends tensioning.Can be by the different conditions of controllable sectional anchor set, in off position, with it
His unbonded prestressing tendon is the same, it is possible to achieve the benefit tensioning of many Span Continuous presstressed reinforcing steels, is the maintenance provides convenient in later stage.
5th, construct simple, strong adaptability.With presstressed reinforcing steel length need not be increased, without going out floor face tensioning, without beam
End haunch, convenient and quick construction, the duration is shorter, the features such as cost is relatively low.
The present invention as unbonded prestressing tendon controllable sectional anchor set, due to more obvious advantage, will have
Good prospect.
The present invention program is described in further detail below by drawings and Examples.
Brief description of the drawings
Fig. 1 is unbonded prestressing tendon controllable sectional anchor set sectional view of the present invention；
Fig. 2 is clamping piece structure of the invention and its oblique perforate otic placode schematic diagram of afterbody；
Fig. 3 is unbonded prestressing tendon controllable sectional anchor set 3 D stereo schematic diagram of the present invention；
Fig. 4 is use of the present invention in two Span Continuous prestressed girders；
Fig. 5 is the single use in three stride continuous prestressed girder of the present invention；
Fig. 6 is the multiple use in three stride continuous prestressed girder of the present invention；
In figure, 1, presstressed reinforcing steel, 2, two-way anchor cup, 3, left intermediate plate, 4, spring, 5, drag-line, 6, right clamping piece, 31 and 61, tiltedly
To perforate otic placode.
Specific embodiment
A kind of unbonded prestressing tendon controllable sectional anchor set, such as Fig. 1, shown in 3, including two-way anchor cup 2, left intermediate plate 3,
Spring 4, drag-line 5, right clamping piece 6, the through hole that presstressed reinforcing steel 1 is passed through is left at two-way anchor 2 length direction axis of cup.In two-way anchor cup 2
The through-hole diameter that is served only for through presstressed reinforcing steel 1 of the portion center through-hole diameter more than 2 arranged on left and right sides outer ends of two-way anchor cup.
The bellmouth of bi-directional symmetrical is provided with the inside center of two-way anchor cup 2 outside through hole arranged on left and right sides, is set respectively in left and right bellmouth
It is equipped with left intermediate plate 3 and right clamping piece 6.Left intermediate plate 3 and right clamping piece 6 constitute (as shown in Figure 2) by 2-3 pieces cone-shaped clip, and taper
Left and right bellmouth of the intermediate plate taper with two-way anchor cup 2 is mutually matched, and left intermediate plate 3 and the afterbody of right clamping piece 6 are provided with oblique opening
Hole otic placode 31,61.The two ends of the spring 4 are connected with the oblique perforate otic placode 31,61 of the afterbody of left intermediate plate 3 and right clamping piece 6 respectively, tiltedly
Tapered direction to the incline direction of perforate otic placode 31,61 respectively with left and right bellmouth is opposite.Drag-line 5 runs through the spring 4, and
Two-way anchor 2 upper centers of cup are provided with the rectangle vertical core that can pass through left intermediate plate 3, spring 4, drag-line 5 and right clamping piece 6, vertical core
Connected with through hole at two-way anchor 2 inside centers of cup, the two ends of drag-line 5 both pass through the vertical core of two-way anchor cup 2.The prestressing without bondn
Muscle controllable sectional anchor set is one or more, and is arranged in building structure beam-column joint core or is arranged in presstressed reinforcing steel 1
At curve low spot.
Wherein, can shrink spring 4 when drag-line 5 is tensed, spring 4 can drive in left intermediate plate 3 and right clamping piece 6 when shrinking and receive,
And then unclamp clamped presstressed reinforcing steel 1；Drag-line 5 can extend spring 4 when unclamping, and spring 4 can drive the He of left intermediate plate 3 when extending
Right clamping piece 6 is extrapolated, and then clamps clamped presstressed reinforcing steel 1.
Wherein, along through hole direction, vertical core length is the length plus 50mm of left intermediate plate 3 or right clamping piece 6 to vertical core length direction, is erected
Hole width is that left intermediate plate 3 or right clamping piece 6 surround diameter length plus 50mm.The symmetrical taper hole length point of two-way anchor 2 middle left and rights of cup
Not Wei the length of left intermediate plate or right clamping piece 6 add 50mm.The termination of drag-line 5 stretch out two-way anchor cup 2 vertical core after length for 500mm~
1000mm。
The assembly method of above-mentioned unbonded prestressing tendon controllable sectional anchor set, step is as follows：
Step one：Left intermediate plate 3 and right clamping piece 6 are placed on corresponding left and right taper through the vertical core above two-way anchor cup 2
In hole；
Step 2：Drag-line 5 is passed through into spring 4；
Step 3：Spring 4 is positioned over inside two-way anchor cup 2 through the vertical core above two-way anchor cup 2, while by spring 4
It is connected with the oblique perforate otic placode 31,61 of the afterbody of left intermediate plate 3 and right clamping piece 6, and the two ends of drag-line 5 is stretched out into vertical core；
Step 4：By the back-moving spring 4 of drag-line 5, by presstressed reinforcing steel 1 through the through hole of two-way anchor cup 2, bullet is set in
Inside spring 4 and left intermediate plate 3 and right clamping piece 6, then loosen drag-line 5.
Above-mentioned unbonded prestressing tendon controllable sectional anchor set can apply (such as Fig. 4-6 in many Span Continuous prestressed girders
It is shown).Specific embodiment is as follows：
Embodiment one
In two Span Continuous prestressed girders, the controllable sectional anchorage (see Fig. 4) is installed in the beam-column joint core on center pillar, draws
Strain at rope and be at off position, after wearing presstressed reinforcing steel, casting beams concrete, after both-end stretch-draw prestressing force and anchoring, pine
Opening drag-line makes controllable sectional anchorage in running order.Realize the segmentation purpose of its two span prestressed beam.
Embodiment two
In three stride continuous prestressed girder, the controllable sectional anchorage 1 is installed (see figure in the beam-column joint core on center pillar
5), tense drag-line and be at off position, after wearing presstressed reinforcing steel, after casting beams concrete, 1) tensioning left end prestressing force is simultaneously
After anchoring, unclamping drag-line makes controllable sectional anchorage in running order, then tensioning right-hand member prestressing force and anchors, and realizes thirdly across pre-
The segmentation purpose of stress beam.2) after tensioning left end, right-hand member prestressing force and anchoring, then unclamping drag-line is in controllable sectional anchorage
Working condition, realizes thirdly the segmentation purpose of span prestressed beam.
Embodiment three
In three stride continuous prestressed girder, the controllable sectional anchorage 2 is respectively mounted in the beam-column joint core on left and right center pillar
Individual (see Fig. 6), tensing drag-line makes its 2 all in off position, after wearing presstressed reinforcing steel, after casting beams concrete, 1) tensioning
After left end prestressing force and anchoring, unclamping drag-line makes left side controllable sectional anchorage in running order, then tensioning right-hand member prestressing force is simultaneously
Anchoring, unclamping drag-line makes the right controllable sectional anchorage in running order, realizes thirdly the segmentation purpose of span prestressed beam.2) exist
After tensioning left end, right-hand member prestressing force and anchoring, then unclamping drag-line makes 2 controllable sectional anchorages all in working condition, realizes it
The segmentation purpose of three span prestressed beams.
The above, the wherein several embodiments only invented are every substantive to above example according to the technology of the present invention
Any modification, change or the equivalent structure change made, all should belong to the protection domain of technical solution of the present invention.
Claims (9)
1. a kind of unbonded prestressing tendon controllable sectional anchor set, it is characterised in that：Including two-way anchor cup (2), left intermediate plate
(3), spring (4), drag-line (5), right clamping piece (6)；Presstressed reinforcing steel (1) is left at described two-way anchor cup (2) length direction axis to pass through
Through hole；Through-hole diameter only using more than two-way anchor cup (2) arranged on left and right sides outer end at described two-way anchor cup (2) inside center
In the through-hole diameter through presstressed reinforcing steel (1)；It is provided with outside through hole arranged on left and right sides at the inside center of two-way anchor cup (2) double
To symmetrical bellmouth, left intermediate plate (3) and right clamping piece (6) are respectively arranged with left and right bellmouth；The left intermediate plate (3) and the right side
Intermediate plate (6) by multi-disc cone-shaped clip constitute, and cone-shaped clip taper with two-way anchor cup (2) mutual of left and right bellmouth
Match somebody with somebody；Left intermediate plate (3) and right clamping piece (6) afterbody are provided with oblique perforate otic placode；Spring (4) two ends respectively with left intermediate plate
(3) it is connected with the oblique perforate otic placode of the afterbody of right clamping piece (6)；The drag-line (5) is through the spring (4), and two-way anchor cup (2)
Upper center is provided with the vertical core that can pass through left intermediate plate (3), spring (4), drag-line (5) and right clamping piece (6), vertical core and two-way anchor
Through hole connection at cup (2) inside center, drag-line (5) two ends both pass through the vertical core of two-way anchor cup (2)；Wherein, drag-line (5) is tensed
When can shrink spring (4), spring (4) can drive in left intermediate plate (3) and right clamping piece (6) when shrinking and receive, and then clamped by unclamping
Presstressed reinforcing steel (1)；When unclamping spring (4) can extend drag-line (5), and spring (4) can drive left intermediate plate (3) and right folder when extending
Piece (6) is extrapolated, and then clamps clamped presstressed reinforcing steel (1).
2. unbonded prestressing tendon controllable sectional anchor set according to claim 1, it is characterised in that：The left intermediate plate
(3) constituted by 2-3 pieces cone-shaped clip with right clamping piece (6).
3. unbonded prestressing tendon controllable sectional anchor set according to claim 1, it is characterised in that：It is described oblique to open
Tapered direction of the hole otic placode incline direction respectively with left and right bellmouth is opposite.
4. unbonded prestressing tendon controllable sectional anchor set according to claim 1, it is characterised in that：The vertical core is
Slot, its length direction along through hole direction, wherein, vertical core length is that the length of left intermediate plate (3) or right clamping piece (6) adds
50mm；Vertical core width is that left intermediate plate (3) or right clamping piece (6) surround diameter length plus 50mm.
5. unbonded prestressing tendon controllable sectional anchor set according to claim 1, it is characterised in that：Two-way anchor cup
(2) the symmetrical taper hole length of middle left and right is respectively left intermediate plate or the length of right clamping piece (6) adds 50mm.
6. unbonded prestressing tendon controllable sectional anchor set according to claim 1, it is characterised in that：Drag-line (5) is held
The length that head is stretched out after the vertical core of two-way anchor cup (2) is 500mm~1000mm.
7. unbonded prestressing tendon controllable sectional anchor set according to claim 1, it is characterised in that：The soap-free emulsion polymeization
Presstressed reinforcing steel controllable sectional anchor set is one or more, and is arranged in building structure beam-column joint core or is arranged in pre- answering
At the curve low spot of power muscle (1).
8. the assembling side of a kind of unbonded prestressing tendon controllable sectional anchor set according to claim any one of 1-7
Method, it is characterised in that：Step is as follows：
Step one：Vertical core by left intermediate plate (3) and right clamping piece (6) through two-way anchor cup (2) above is placed on corresponding left and right cone
In shape hole；
Step 2：By drag-line (5) through spring (4)；
Step 3：Spring (4) through two-way anchor cup (2) vertical core above is positioned over two-way anchor cup (2) internal, while by spring
(4) it is connected with the oblique perforate otic placode of the afterbody of left intermediate plate (3) and right clamping piece (6), and drag-line (5) two ends is stretched out into vertical core；
Step 4：By drag-line (5) back-moving spring (4), presstressed reinforcing steel (1) through the through hole of two-way anchor cup (2) is arranged
In spring (4) and left intermediate plate (3) and right clamping piece (6) inside, then loosen drag-line (5).
9. a kind of unbonded prestressing tendon controllable sectional anchor set according to claim any one of 1-7 is in many Span Continuous
Application in prestressed girder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510067173.XA CN104675122B (en) | 2015-02-09 | 2015-02-09 | Unbonded prestressing tendon controllable sectional anchor set and its assembly method and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510067173.XA CN104675122B (en) | 2015-02-09 | 2015-02-09 | Unbonded prestressing tendon controllable sectional anchor set and its assembly method and application |
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| Publication Number | Publication Date |
|---|---|
| CN104675122A CN104675122A (en) | 2015-06-03 |
| CN104675122B true CN104675122B (en) | 2017-06-16 |
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| CN201510067173.XA Expired - Fee Related CN104675122B (en) | 2015-02-09 | 2015-02-09 | Unbonded prestressing tendon controllable sectional anchor set and its assembly method and application |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105649342B (en) * | 2016-03-21 | 2018-08-03 | 中建三局基础设施工程有限公司 | A kind of interim traction connector of steel strand wires and its application method |
| CN106679700A (en) * | 2017-02-10 | 2017-05-17 | 南京大学 | Simple and rapid anchoring method and apparatus of distributive sensing optical cable |
| CN108716284B (en) * | 2018-06-08 | 2021-06-04 | 贵州中建建筑科研设计院有限公司 | Anti-rebound steel strand tensioner |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3438865C1 (en) * | 1984-10-24 | 1986-04-03 | Dyckerhoff & Widmann AG, 8000 München | Wedge anchorage for the tensioning side of a single tendon for a prestressed concrete component |
| CH665444A5 (en) * | 1985-01-17 | 1988-05-13 | Losinger Ag | INTERMEDIATE ANCHOR ARRANGEMENT FOR PRELOADING COMPONENTS PRODUCED IN SEVERAL STAGES, AND A METHOD FOR PRODUCING SUCH AN INTERMEDIATE ANCHOR ARRANGEMENT. |
| JP3683112B2 (en) * | 1998-12-25 | 2005-08-17 | 株式会社大林組 | Prestressed concrete structure |
| CN2825803Y (en) * | 2005-09-23 | 2006-10-11 | 江阴法尔胜毅强工程材料有限公司 | Connector anchor for prestressed structure |
| CN202202483U (en) * | 2011-08-12 | 2012-04-25 | 天津市振华预应力技术有限公司 | Anti-loose self-anchoring connector |
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2015
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