CN217601842U - Continuous beam web structure applying slow-bonding vertical prestress system - Google Patents
Continuous beam web structure applying slow-bonding vertical prestress system Download PDFInfo
- Publication number
- CN217601842U CN217601842U CN202123146069.XU CN202123146069U CN217601842U CN 217601842 U CN217601842 U CN 217601842U CN 202123146069 U CN202123146069 U CN 202123146069U CN 217601842 U CN217601842 U CN 217601842U
- Authority
- CN
- China
- Prior art keywords
- anchor
- steel strand
- plate
- prestress
- concrete
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Reinforcement Elements For Buildings (AREA)
Abstract
The utility model discloses a continuous beam web structure applying a slow bonding vertical prestress system, which comprises a plurality of prestress mechanisms and a web plate which are parallel to each other, wherein one end of each prestress mechanism is arranged in the web plate, the other end of each prestress mechanism is arranged on the outer surface part of one end of the web plate, and one end of each adjacent prestress mechanism arranged in the web plate is a discrete point of a continuous multi-section smooth curve; the prestress mechanism comprises a tensioning end, steel strands and an anchoring end, the tensioning end and the anchoring end are arranged at two ends of the steel strands, the anchoring sections are arranged inside concrete, the tensioning end is arranged on the surface of the concrete, the steel strands comprise prestress steel strand bundles, a delay fixing layer and a sheath, the prestress steel strand bundles are steel strand bundles formed by a plurality of steel strands, the delay fixing layer is arranged on the outer layer of the prestress steel strand bundles, and the sheath wraps the delay fixing layer. The utility model discloses set retarding adhesive hardens gradually, forms the adhesion stress between prestressing force steel strand wires and the concrete, and prestressing force shifts to and bears by the adhesion stress between steel strand wires and the concrete.
Description
Technical Field
The utility model relates to a prestressing force stretch-draw field especially relates to an use continuous beam web structure of vertical prestressing force system of slow bonding.
Background
The large main tensile stress exists in the large-span continuous beam web area, the web can be prevented from cracking under the action of the main tensile stress, the thickness of the web can be increased on the one hand, and the vertical prestress can be additionally arranged on the other hand. The former results in excessive weight of the structure and waste of material. The latter applies prestress by adopting a mode of finish rolling deformed steel bar at present, and has the main problems that the relaxation rate is high, and the short-distance finish rolling deformed steel bar is sensitive to relaxation in stress, so that the larger prestress loss is caused; secondly, the finish-rolled deformed steel bar has low strength, and steel is wasted only by increasing the diameter of the steel bar to meet the bearing capacity requirement; thirdly, the grouting process is complex, is greatly influenced by construction quality, and is not compact, so that finish-rolled deformed steel bars are easily corroded, and a large potential safety hazard exists.
There is a need for a continuous web structure employing a slow-bonded vertical prestressing system that addresses the above-mentioned problems.
Disclosure of Invention
The utility model aims to solve the problems that the increase of the thickness of the web plate in the prior art leads to the overlarge self weight of the structure and the waste of materials; it is high to add vertical prestressing force relaxation rate, it is comparatively sensitive to lax in the short distance finish rolling screw-thread steel atress, lead to great prestressing loss, finish rolling screw-thread steel intensity is low, can only lead to the fact steel extravagant through increaseing the reinforcing bar diameter for satisfying the bearing capacity requirement, the mud jacking technology is more complicated, it is very big to receive construction quality to influence, the mud jacking is not closely knit leads to the finish rolling screw-thread steel corrosion easily, there is the problem of great potential safety hazard, a continuous beam web structure of using the vertical prestressing force system that slowly bonds is provided, adopt the mode of slowly bonding, the above-mentioned problem has been solved.
The utility model provides a continuous beam web structure of a vertical prestressed system applying slow bonding, which comprises a plurality of prestressed mechanisms and webs which are parallel to each other, wherein one end of each prestressed mechanism is arranged in the web, the other end of each prestressed mechanism is arranged on the outer surface part of one end of the web, and one end of each adjacent prestressed mechanism arranged in the web is a discrete point of a continuous multi-section smooth curve; the prestress mechanism comprises a tensioning end, steel strands and an anchoring end, the tensioning end and the anchoring end are arranged at two ends of the steel strands, the anchoring sections are arranged inside concrete, the tensioning end is arranged on the surface of the concrete, the steel strands comprise prestress steel strand bundles, a delay fixing layer and a sheath, the prestress steel strand bundles are steel strand bundles formed by a plurality of steel strands, the delay fixing layer is arranged on the outer layer of the prestress steel strand bundles, and the sheath wraps the delay fixing layer.
The vertical prestress system is uniformly arranged along the longitudinal direction of the web plate and comprises a tensioning end, a slow bonding steel strand and an anchoring end. The single anchor and group anchor mode can be adopted, and the single-hole prestressed beam comprises 1-10 steel stranded wires.
The slow-bonding prestressed steel strand is combined with the anchor plate by using the clamping piece at the tensioning end, and the tensioned prestress is transferred to the anchor backing plate by meshing the threads between the locking nut and the anchor plate. The delayed coagulation adhesive wrapped on the prestressed steel strand is gradually hardened, the binding force is formed between the prestressed steel strand and the concrete, and the prestress borne by the anchor backing plate is transferred to be borne by the binding force between the steel strand and the concrete.
A continuous beam web structure of vertical prestressing force system of using slowly to bond, as preferred mode, the tensioning end includes first anchor slab, first anchor backing plate, first clamping piece and first spiral muscle, first anchor backing plate sets up in the concrete surface, first anchor slab, first clamping piece and steel strand wires tip are nested from outside to inside in proper order, first anchor slab, first clamping piece sets up in first anchor backing plate outside face, the tip of steel strand wires passes first anchor backing plate from inside to outside in proper order, first anchor slab and first clamping piece, first spiral muscle sets up in that first anchor backing plate pastes concrete face inboard and sets up in the concrete, first spiral muscle, the tip of steel strand wires, first anchor slab and first clamping piece coaxial line.
A continuous beam web structure of vertical prestressing force system of using slowly bond, as preferred mode, the anchor end includes the second anchor slab, the second anchor backing plate, second clamping piece and second spiral muscle, the second anchor backing plate is buried inside the concrete, the second anchor slab, second clamping piece and steel strand wires tip are nested from outside to inside in proper order, the second anchor slab, the second clamping piece sets up in the inboard face of second anchor backing plate, the tip of steel strand wires passes the second anchor backing plate from inside to outside in proper order, second anchor slab and second clamping piece, second spiral muscle sets up in second anchor backing plate orientation stretch-draw end one side and sets up in the concrete, second spiral muscle, the tip of steel strand wires, second anchor slab and second clamping piece coaxial line.
A continuous beam web structure of vertical prestressing force system of using slowly bond, as preferred mode, the anchor end includes P anchor, second anchor backing plate and second spiral muscle, inside the second anchor backing plate buries in the concrete, P anchor steel strand wires tip, the P anchor, the second clamping piece sets up in the inboard face of second anchor backing plate, the tip of steel strand wires passes second anchor backing plate and P anchor from inside to outside in proper order, second spiral muscle sets up in second anchor backing plate and opens the tensile end one side and set up in the concrete, the tip and the P anchor coaxial line of second spiral muscle, steel strand wires.
A continuous web structure of vertical prestressing force system of using slowly to bond, as preferred mode, stretch-draw end still includes locking bolt, lock nut nestification is in the first anchor slab outside, lock nut sets up in first anchor backing plate outside face.
The tensioning end comprises two forms, namely a common clamping piece type anchorage device and a low retraction anchorage device. The common clip type anchorage comprises structures such as an anchor plate, a clip, an anchor backing plate, a spiral rib and the like, the retraction amount is controlled to be 1.5-3 mm by designing the taper of the clip, the clip and the like, and the common clip type anchorage has the characteristics of one-time tensioning in place, small requirement on the space of an anchor recess of an anchoring area and the like. The low retraction anchorage is formed by adding a lock nut structure on the basis of a common clip type anchorage.
The construction method of the technical scheme comprises the following steps:
s1, mounting a prestressed system and pouring concrete:
the anchor end is assembled, the clamping piece type anchorage device is formed by clamping a clamping piece and a steel strand in advance, and the P anchor is formed by extruding an extrusion anchor head and the steel strand through special equipment. The clamping piece type anchorage and the P anchor are tightly attached to the anchor backing plate. Installing a template, arranging an anchorage device at an anchoring end, a slow bonding steel strand, a spiral rib and an anchor backing plate at a tensioning end, and fixing an anchoring system by adopting a positioning measure. Directly pouring concrete on the slow bonding prestressed steel strand, fully vibrating and maintaining;
s2, prestress tension:
a. when a low retraction anchor is employed:
after the concrete reaches the designed strength, the anchoring effect is realized through two times of tensioning. The design tension force is achieved by tensioning the steel strand by the oil pressure control jack 1 for the first time, the ejector rod 1 jacks the clamping piece into the anchor plate through the limiting plate under the action of oil pressure before oil return, the oil return achieves anchoring, and the retraction amount of the prestressed steel strand is about 6mm generally at the moment. The second tensioning is to lock the bearing nut to reduce the excessive retraction amount of the prestressed steel strand after the first tensioning and anchoring. Through the control oil circuit, jack 2 draws the steel strand wires under the control of second oil pressure, and the steel strand wires drive the ground tackle and are drawn together, and the elongation that the jack appears is the volume of contracting of steel strand wires when drawing for the first time, and rotatable pressure-bearing nut supports tightly on the anchor backing plate this moment, and each part of ground tackle is all locked, and the lock anchor is accomplished. After the secondary tensioning is finished, the total retraction amount of the steel strand is ensured to be less than 1mm;
b. when the common clamping piece anchorage is adopted:
after the concrete reaches the design strength, the anchoring effect is realized through one-time tensioning;
s3, tensioning end sealing anchor:
and after tensioning is finished, sealing the anchor hole at the tensioning end. Arranging well-shaped ribs in the anchor recess, and filling the anchor recess with C50 compensation shrinkage concrete;
s4, transformation of anchoring system
After tensioning is finished, the prestress is transmitted to the concrete by the anchorage device, and the steel strand and the concrete are not bonded. With the gradual hardening of the delayed coagulation adhesive wrapped on the prestressed steel strand, the prestressed steel strand and the concrete have cohesive force, and the tensile force is transferred from the anchorage device to the cohesive force between the prestressed steel strand and the hardened delayed coagulation adhesive.
The utility model discloses beneficial effect as follows:
(1) The delayed coagulation adhesive wrapped on the prestressed steel strand is gradually hardened, the binding force is formed between the prestressed steel strand and the concrete, and the prestress borne by the anchor backing plate is transferred to be borne by the binding force between the steel strand and the concrete;
(2) The bundled slow bonding steel strands can vertically pass through the anchor backing plate, and part of the steel strands can also pass through the anchor backing plate at a certain angle; the preformed hole is provided with a fillet to prevent the slowly-bonded steel strand sheath from being cut.
Drawings
FIG. 1 is a schematic view of a continuous web structure employing a retarded adhesion vertical prestressing system;
FIG. 2 is a schematic view of a continuous beam web structure prestressing mechanism employing a slow-bonding vertical prestressing system;
FIG. 3 is a schematic view of a continuous beam web structural steel strand using a slow-bonding vertical prestressing system
FIG. 4 is a schematic view of a tension end of an embodiment 1 of a continuous web structure using a slow-bonding vertical pre-stress system;
FIG. 5 is a schematic view of an anchoring end of an embodiment 1 of a continuous web structure employing a slow-bonding vertical pre-stress system;
FIG. 6 is a schematic view of an anchoring end of an embodiment 2 of a continuous web structure employing a slow-bonding vertical pre-stress system;
fig. 7 is a schematic view of the tension end of an embodiment 3 of a continuous web structure using a slow-bonding vertical prestressing system.
Reference numerals are as follows:
1. a pre-stressing mechanism; 11. stretching the end; 111. a first anchor plate; 112. a first anchor backing plate; 113. a first clip piece; 114. a first spiral rib; 115. locking the bolt; 12. steel strand wires; 121. a prestressed steel strand bundle; 122. a delay fixing layer; 123. a sheath; 13. an anchoring end; 131. a second anchor plate; 132. a second anchor backing plate; 133. a second clip; 134. a second spiral rib; 135. a P anchor; 2. a web.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Example 1
As shown in fig. 1, a continuous web structure of a beam applying a slow-bonding vertical prestress system comprises a plurality of prestress mechanisms 1 and a web 2 which are parallel to each other, wherein one end of each prestress mechanism 1 is arranged in the web 2, the other end of each prestress mechanism 1 is arranged on the outer surface of one end of the web 2, and one end of each adjacent prestress mechanism 1, which is arranged in the web 2, is a discrete point of a continuous multi-section smooth curve;
as shown in fig. 2, the prestressing mechanism 1 includes a tensioning end 11, a steel strand 12 and an anchoring end 13, the tensioning end 11 and the anchoring end 13 are disposed at two ends of the steel strand 12, the anchoring section is disposed in the concrete, and the tensioning end 11 is disposed on the surface of the concrete;
as shown in fig. 3, the steel strand 12 includes a prestressed steel strand bundle 121, a delay fixing layer 122 and a sheath 123, the prestressed steel strand bundle 121 is a steel strand bundle composed of a plurality of steel strands, the delay fixing layer is disposed on an outer layer of the prestressed steel strand bundle 121, and the sheath wraps the delay fixing layer 122.
As shown in fig. 4, the tensioning end 11 includes a first anchor plate 111, a first anchor plate 112, a first clamping piece 113 and a first spiral rib 114, the first anchor plate 112 is disposed on the outer surface of the concrete, the first anchor plate 111, the first clamping piece 113 and the end of the steel strand 12 are sequentially nested from outside to inside, the first anchor plate 111, the first clamping piece 113 is disposed on the outer side of the first anchor plate 112, the end of the steel strand 12 sequentially passes through the first anchor plate 112 from inside to outside, the first anchor plate 111 and the first clamping piece 113, the first spiral rib 114 is disposed on the inner side of the concrete surface where the first anchor plate 112 is closely attached and is disposed in the concrete, the first spiral rib 114, the end of the steel strand 12, and the first anchor plate 111 and the first clamping piece 113 are coaxial.
As shown in fig. 5, the anchoring end 13 includes a second anchor plate 131, a second anchor backing plate 132, a second clamping piece 133 and a second spiral rib 134, the second anchor backing plate 132 is embedded in the concrete, the second anchor plate 131, the second clamping piece 133 and the end of the steel strand 12 are sequentially nested from outside to inside, the second anchor plate 131 and the second clamping piece 133 are disposed on the inner side plate surface of the second anchor backing plate 132, the end of the steel strand 12 sequentially penetrates through the second anchor backing plate 132, the second anchor plate 131 and the second clamping piece 133 from inside to outside, the second spiral rib 134 is disposed on one surface of the second anchor backing plate 132 facing the tensioning end 11 and disposed in the concrete, and the second spiral rib 134, the end of the steel strand 12, the second anchor plate 131 and the second clamping piece 133 are coaxial.
The anchor backing plate is made of round or square steel plates with equal thickness, and the steel plates can be made of (including but not limited to) Q235, Q345, Q370, Q420 and Q500 plates, and can also be made of No. 45 steel and 40Cr steel bars. And a positioning hole for the slow bonding steel strand to pass through is reserved in the middle of the anchor backing plate, and the size of the positioning hole is slightly larger than the outer diameter of the sheath of the slow bonding steel strand. When the anchor group is adopted, the hole positions of the reserved holes strictly correspond to the hole positions of anchor holes of the anchor plate; when the single anchor is adopted, enough clearance is reserved between the reserved hole sites, and the stretching operation space of each anchor is ensured. The anchor backing plate can be matched with a low-retraction anchor device, and can also be matched with a conventional anchor device. The thickness, diameter or side length, material and the like of the anchor backing plate meet the concrete stress requirement of the anchoring area and the self stress requirement of the anchor backing plate. The anchor backing plate is matched with the spiral ribs for use.
Example 2
As shown in fig. 6, unlike embodiment 1, in this embodiment, the anchoring end 13 includes a P anchor 135, a second anchor plate 132 and a second spiral rib 134, the second anchor plate 132 is buried in the concrete, the P anchor 135 anchors the end of the steel strand 12, the P anchor 135 and the second clip 133 are disposed on the inner side of the second anchor plate 132, the end of the steel strand 12 sequentially passes through the second anchor plate 132 and the P anchor 135 from inside to outside, the second spiral rib 134 is disposed on the side of the second anchor plate 132 facing the tensioning end 11 and disposed in the concrete, and the second spiral rib 134, the end of the steel strand 12 and the P anchor 135 are coaxial.
Example 3
As shown in fig. 7, on the basis of embodiment 1, the tensioning end 11 further includes a lock nut 115, the lock nut 115 is nested outside the first anchor plate 111, and the lock nut is disposed on the outer plate surface of the first anchor backing plate 112.
The slow-bonding prestressed steel strand comprises a sheath, a prestressed steel strand and a slow-setting adhesive. The strength grades of the prestressed steel strands comprise 1860MPa, 1960MPa, 2000MPa, 2100MPa, 2200MPa, 2300MPa and 2400MPa grades. The diameter specifications of the steel strands are 15.2mm, 17.8mm, 21.8mm and 28.6mm, and the steel strands comprise two steel strand structures of 1 × 7 and 1 × 19. The slow-bonding agent adopts two types of thermosetting type and moisture type.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (5)
1. The utility model provides an use vertical prestressing force system's of slow bonding continuous beam web structure which characterized in that: the device comprises a plurality of parallel prestress mechanisms (1) and a web plate (2), wherein one end of each prestress mechanism (1) is arranged in the web plate (2), the other end of each prestress mechanism is arranged on the outer surface part of one end of the web plate (2), and one end, which is arranged in the web plate (2) and adjacent to each prestress mechanism (1), is a discrete point of a continuous multi-section smooth curve;
the prestress mechanism (1) comprises a tensioning end (11), a steel strand (12) and an anchoring end (13), wherein the tensioning end (11) and the anchoring end (13) are arranged at two ends of the steel strand (12), the anchoring end (13) is arranged in concrete, and the tensioning end (11) is arranged on the surface of the concrete;
the steel strand (12) comprises a prestressed steel strand bundle (121), a delay fixed layer (122) and a sheath (123), the prestressed steel strand bundle (121) is a steel strand bundle formed by a plurality of steel strands, the delay fixed layer (122) is arranged on the outer layer of the prestressed steel strand bundle (121), and the sheath (123) wraps the delay fixed layer (122).
2. The continuous beam web structure applying the slow-bonding vertical prestress system according to claim 1, wherein: stretch-draw end (11) include first anchor plate (111), first anchor backing plate (112), first clamping piece (113) and first spiral muscle (114), first anchor backing plate (112) set up in the concrete surface, first anchor plate (111) first clamping piece (113) with steel strand wires (12) tip is from outside-in nested in proper order, first anchor plate (111) first clamping piece (113) set up in first anchor backing plate (112) outside face, the tip of steel strand wires (12) is passed from inside to outside in proper order first anchor backing plate (112), first anchor plate (111) with first clamping piece (113), first spiral muscle (114) set up in first anchor backing plate (112) paste the concrete face inboard and set up in the concrete, first spiral muscle (114), the tip of steel strand wires (12) first anchor plate (111) with first clamping piece (113) coaxial line.
3. The continuous beam web structure applying the slow-bonding vertical prestress system according to claim 1, wherein: anchor end (13) include second anchor plate (131), second anchor backing plate (132), second clamping piece (133) and second spiral muscle (134), second anchor backing plate (132) bury inside the concrete, second anchor plate (131) second clamping piece (133) with steel strand wires (12) tip is from outside-in nested in proper order, second anchor plate (131) second clamping piece (133) set up in the inboard face of second anchor backing plate (132), the tip of steel strand wires (12) passes from inside to outside in proper order second anchor backing plate (132) second anchor plate (131) with second clamping piece (133), second spiral muscle (134) set up in second anchor backing plate (132) are towards stretch-draw end (11) one side and set up in the concrete, second spiral muscle (134) the tip of steel strand wires (12) second anchor plate (131) with second clamping piece (133) coaxial line.
4. The continuous beam web structure applying the slow-bonding vertical prestress system according to claim 3, wherein: anchor end (13) include P anchor (135), second anchor plate (132) and second spiral muscle (134), second anchor plate (132) bury inside the concrete, P anchor (135) anchor steel strand wires (12) tip, P anchor (135) second clamping piece (133) set up in the inboard face of second anchor plate (132), the tip of steel strand wires (12) is passed from inside to outside in proper order second anchor plate (132) with P anchor (135), second spiral muscle (134) set up in second anchor plate (132) are opened to draw end (11) one side and set up in the concrete, second spiral muscle (134) the tip of steel strand wires (12) with P anchor (135) coaxial line.
5. The continuous beam web structure applying the slow-bonding vertical prestress system according to claim 2, wherein: the tensioning end (11) further comprises a locking nut (115), the locking nut (115) is nested on the outer side of the first anchor plate (111), and the locking nut is arranged on the outer plate surface of the first anchor backing plate (112).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123146069.XU CN217601842U (en) | 2021-12-15 | 2021-12-15 | Continuous beam web structure applying slow-bonding vertical prestress system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123146069.XU CN217601842U (en) | 2021-12-15 | 2021-12-15 | Continuous beam web structure applying slow-bonding vertical prestress system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217601842U true CN217601842U (en) | 2022-10-18 |
Family
ID=83561386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123146069.XU Active CN217601842U (en) | 2021-12-15 | 2021-12-15 | Continuous beam web structure applying slow-bonding vertical prestress system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217601842U (en) |
-
2021
- 2021-12-15 CN CN202123146069.XU patent/CN217601842U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3967421A (en) | Tie formed of stressed high-tensile steel tendons | |
| EP1505223A1 (en) | Corrosion protected tendon, especially for prestressed concrete | |
| JPS61169560A (en) | Intermediate anchor apparatus for applying prestress to structural element formed in several construction stages andmanufacturing of said apparatus | |
| CN2739290Y (en) | Steel strand vertical prestress anchoring system | |
| EP3272958A1 (en) | Structural element for heat insulation | |
| CN112647706A (en) | Construction method for long-span concrete beam slow-bonding prestress | |
| CN217601842U (en) | Continuous beam web structure applying slow-bonding vertical prestress system | |
| DE2944878A1 (en) | Concrete reinforcing rod or wire corrosion protection - involves tight full length metal sheath form locked round it | |
| CN110725547A (en) | Compact steel strand inhaul cable and manufacturing method thereof | |
| CN202031026U (en) | Finished cable type anchorage anchoring system | |
| USRE34350E (en) | Tie formed of stressed high-tensile steel tendons | |
| US2455153A (en) | Composite structural member | |
| CN102912987B (en) | Stress applying method and tool thereof for low retraction pre-stress concrete member | |
| CN110485631A (en) | There is the pretensioned prestressing precast beam of anchor head in a kind of end | |
| JP3014069B2 (en) | Fiber reinforced concrete wall at the start of the tunnel shaft | |
| CN209874067U (en) | Flexible high-strength connecting rib | |
| CN211007319U (en) | Beam end anchorage device for pre-tensioning method prestressed precast beam | |
| CN109826323B (en) | Flexible high-strength connecting rib and assembly method thereof | |
| KR100471374B1 (en) | Compressive Bearing Type Ground Anchor | |
| CN217601208U (en) | Vertical prestressing force system of railway bridge roof beam | |
| DE3339058A1 (en) | Exposed tightenable tension member comprising one or more tension elements, such as steel rods, wires or strands | |
| AT396153B (en) | TENSION | |
| CN212505856U (en) | Double-helix ladder tooth high-strength prestressed rib anchoring system | |
| CN113481870A (en) | Prestressed anchoring structure system for assembling multi-segment bridge pier and assembling construction method of multi-segment bridge pier | |
| CN1487149A (en) | High-grade prestressed bolt cable of compact rope for geotechnical engineering |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |