CN210459771U - Fixed end anchorage device of multi-layer steel wire structure steel strand - Google Patents
Fixed end anchorage device of multi-layer steel wire structure steel strand Download PDFInfo
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- CN210459771U CN210459771U CN201920703871.8U CN201920703871U CN210459771U CN 210459771 U CN210459771 U CN 210459771U CN 201920703871 U CN201920703871 U CN 201920703871U CN 210459771 U CN210459771 U CN 210459771U
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Abstract
A fixed-end anchorage of a multi-layer steel wire structure steel strand relates to an extrusion type anchorage, which comprises the multi-layer steel wire structure steel strand, an extrusion sleeve and a conical sleeve, wherein the conical sleeve is positioned between the multi-layer steel wire structure steel strand and the extrusion sleeve, the extrusion sleeve is in conical fit with the conical sleeve, the fit angle is 1-7 degrees, the external taper of the conical sleeve is α, the taper of an internal taper hole of the extrusion sleeve is β, the external taper α of the conical sleeve is 0.1-1 degree larger than the taper β of the internal taper hole of the extrusion sleeve, furthermore, 2-6 grooves are radially formed at two ends of the conical sleeve, an inner hole of the conical sleeve is in an inverted tooth-shaped thread structure, and after being stressed, threads are embedded into the multi-layer steel wire structure steel strand.
Description
Technical Field
The utility model relates to an anchorage device for civil engineering structure, especially a stiff end anchorage device of multilayer steel wire structure steel strand wires.
Background
The existing prestressed steel strand for the civil engineering structure is a 1 multiplied by 7 structure, and after the extrusion sleeve, the extrusion spring and the steel strand are subjected to reducing extrusion by adopting special extrusion equipment, the extrusion sleeve, the extrusion spring and the steel strand are wrapped into a whole. With the continuous development of prestress technology and structure, steel strands develop towards higher strength and larger diameter direction, in 2015, prestress steel strands have a 1 × 19 three-layer multi-layer steel wire structure steel strand with different structures such as phi 17.8, phi 21.8, phi 28.6 and the like in national standard, the anchoring mode mainly adopts a clamping piece anchor, but in the structure, a fixed end is frequently used, the anchoring technology of the fixed end of the steel strand with the 1 × 7 structure is directly used, the anchoring effect is poor, and the middle steel wire or the central steel wire is frequently slipped after being stressed.
The invention discloses a technical scheme of a large-diameter steel strand extrusion type anchor with the patent publication number of CN102425270A, and the invention name of the invention is 'a large-diameter steel strand extrusion type anchor', namely, a conical sleeve is added on the technical scheme of the existing 1 x 7 steel strand extrusion anchor, the conical sleeve is installed at a central steel wire, a plurality of layers of steel strands are expanded at the end part through the conical sleeve so as to increase the extrusion force among the steel wires of each layer, but in the actual situation, after the conical sleeve is installed, an extrusion spring cannot push the end part of the steel strand with the structure of the plurality of layers of steel wires, the part of the extrusion sleeve with the conical sleeve after extrusion has no extrusion spring action, and the anchoring effect cannot be expected.
The invention patent application with the patent publication number of CN102287030A and the invention name of 'large-diameter steel strand extrusion sleeve' discloses a technical scheme, and adopts extrusion sheets with grooves at two axial ends to replace extrusion springs, so that the anchoring effect can be enhanced, but after the number of layers of steel wires is increased, the central steel wires still slide after being stressed, and the anchoring efficiency can not reach the index of 95% required by the standard, so the market can not be promoted.
The common point of the above structures is that reducing extrusion is adopted, the radial diameter of an extrusion sleeve is reduced by extrusion equipment to generate axial pressure to the steel strand, the outer layer steel wire is in direct contact with an extrusion spring or similar parts such as extrusion sheets with grooves at two ends, and the outer layer steel wire is partially embedded into the steel wire, when the steel strand with a multi-layer steel wire structure is stressed, the gripping force of the outer layer steel wire is enough, but the middle layer steel wire and the central steel wire completely depend on the reducing pressure transmitted by the outer layer steel wire, namely the friction force between the steel wires, the strength of the high-strength steel wire is high, the hardness is high, the friction force generated by extrusion deformation between the steel wires is not enough to resist the limit tensile force of the steel wire, when a static load test is carried out, after the tensile force exceeds 80% of the nominal tensile strength of the steel strand with the multi-layer steel wire.
The patent application with the patent publication number of CN107035075A and the invention name of 'large-diameter steel strand extrusion sleeve' discloses a technical scheme that a plurality of layers of steel wires are extruded in a layered mode to increase the bond stress between a middle steel wire and a central steel wire, but the outer layer of steel wires need to be cut circularly during manufacturing, three extrusion rings with different specifications are assembled, construction operation is not facilitated, and manufacturing efficiency is low.
Disclosure of Invention
The utility model aims to provide a: the fixed end anchorage device of the multilayer steel wire structure steel strand extrudes the extrusion sleeve, the conical sleeve and the multilayer steel wire structure steel strand into a whole through reducing extrusion equipment, can be conveniently manufactured on a construction site, is simple and easy to operate, and has anchoring efficiency reaching the standard requirement; the anchor can be used as a fixed end anchor and applied to vertical prestress engineering or structural engineering with one end embedded; the two ends are extruded with the fixed end anchorage device of the multi-layer steel wire structure steel strand, and the fixed end anchorage device can also be used as a tool cable or a structural cable.
The technical scheme for solving the problems is that the fixed end anchorage of the steel strand with the multi-layer steel wire structure relates to an extrusion type anchorage, and the anchorage comprises the steel strand with the multi-layer steel wire structure and an extrusion sleeve and is characterized by further comprising a conical sleeve, wherein the conical sleeve is positioned between the steel strand with the multi-layer steel wire structure and the extrusion sleeve, the extrusion sleeve is in conical fit with the conical sleeve, the fit angle is 1-7 degrees, the external taper of the conical sleeve is α degrees, the taper of an internal taper hole of the extrusion sleeve is β degrees, and the external taper α degree of the conical sleeve is 0.1-1 degrees larger than the taper β degree of the internal taper hole of the extrusion sleeve.
The further technical scheme is as follows: 2-6 grooves are radially formed at two ends of the conical sleeve.
The further technical scheme is as follows: the inner hole of the conical sleeve is of an inverted tooth-shaped thread structure, and the thread is embedded into the steel strand of the multilayer steel wire structure after stress.
Due to the structure, the utility model discloses a "stiff end ground tackle of multilayer steel wire construction steel strand" has following beneficial effect:
one, the utility model discloses a fixed end ground tackle of multilayer steel wire structure steel strand wires's anchor is efficient, can reach the standard requirement:
when the steel strand structure is a multilayer steel wire, the existing anchoring method is adopted, external extrusion force cannot be smoothly transmitted to the middle part, so that the anchoring efficiency is low, and the friction force generated by extrusion deformation among the steel wires is not enough to resist the ultimate tensile force of the steel wires, so that when a static load test is carried out, after the tensile force exceeds 80 percent of the nominal tensile strength of the steel strand with the multilayer steel wire structure, the middle steel wire or the central steel wire slides, so that the anchoring efficiency cannot meet the standard requirement;
the utility model adopts the mode of adding the conical sleeve between the multilayer steel wire structure steel strand 3 and the extrusion sleeve 2, after the multilayer steel wire structure steel strand is stressed, the conical angle of the conical sleeve converts the axial tension part to be stressed into radial pressure and transmits the radial pressure to the middle layer steel wire, the larger the tension is, the larger the radial force is transmitted to the middle part is, thereby effectively anchoring the multilayer steel wire structure steel strand; the magnitude of the radial force component is proportional to the taper angle of the pressing sleeve 2 and the tapered sleeve.
Secondly, the inverted tooth-shaped thread structure of the contact surface of the inner hole of the conical sleeve and the multi-layer steel wire structure steel strand can effectively enhance the bond wrapping counter force of the conical sleeve to the multi-layer steel wire structure steel strand.
Thirdly, when the length of the extrusion sleeve exceeds the length of the conical sleeve, the inner cavity of the extrusion sleeve can form an inverted conical hole 21, so that the conical sleeve can be effectively prevented from falling off from the interior of the extrusion sleeve when the fixed end anchorage device is subjected to negative force, and the anchoring effect is further enhanced.
Secondly, the manufacturing and mounting method is simple: the method is characterized in that after the conical sleeve 1 and the extrusion sleeve 2 with corresponding specifications are manufactured and prepared in advance, the multilayer steel wire structure steel strand 3 is blanked according to the construction length on site, and then the steel strand is assembled and extruded.
Thirdly, the application range is wide:
the fixed end anchorage of the multi-layer steel wire structure steel strand of the utility model is used as a fixed end anchorage and can be applied to vertical prestress engineering or structural engineering with one end embedded; when both ends of the multi-layer steel wire structure steel strand are extruded, the utility model discloses a behind the stiff end ground tackle of multi-layer steel wire structure steel strand, still can regard as instrument cable or for the structure cable.
The technical features of the fixed end anchorage for multi-layer steel wire structure steel strand according to the present invention will be further described with reference to the accompanying drawings and examples.
Drawings
Fig. 1-2 are the overall structure schematic diagram of the fixed end anchorage device of the multi-layer steel wire structure steel strand of the utility model:
FIG. 1-1 is a front sectional view, and FIG. 1-2 is a view taken along the line A of FIG. 1-1;
2-1-2-4 are schematic diagrams of the structure of the conical sleeve:
FIG. 2-1 is a front view, FIG. 2-2 is a view from the direction B of FIG. 2-1,
FIG. 2-3 is a view taken along line C of FIG. 2-1, and FIG. 2-4 is an enlarged view taken along line D of FIG. 2-1;
FIG. 3 is a schematic view of an extrusion bushing;
FIGS. 4 to 8 are schematic diagrams illustrating the steps of a method for manufacturing a fixed-end anchorage of a steel strand with a multi-layer steel wire structure:
FIG. 4 shows the assembly step B;
FIG. 5C is a C1 step of the extruding step, the step of pushing the taper sleeve into the extruding sleeve;
FIG. 6C is a C2 step of the extrusion step, the integral push-in extrusion die step;
FIG. 7 shows the step D of pressing, the step of completing the pressing;
FIG. 8 is a schematic view showing the state of the fixed-end anchorage of the multi-layered steel wire structural steel strand after the completion of the extrusion step.
In the figure:
1-a conical sleeve, 11-a groove and 12-a reversed-tooth-shaped thread structure;
2-extruding a sleeve, 21-forming an inverted conical hole;
3-multilayer steel wire structure steel strand, 4-extrusion die, 5-top pressure head.
Detailed Description
A multi-layer steel wire structure steel strand fixed end anchorage device:
as shown in fig. 1-2, the anchorage device for the fixed end of the multi-layer steel wire structure steel strand comprises a conical sleeve 1, an extrusion sleeve 2 and a multi-layer steel wire structure steel strand 3, wherein the conical sleeve 1 is positioned between the multi-layer steel wire structure steel strand 3 and the extrusion sleeve 2, the extrusion sleeve 2 is in conical fit with the conical sleeve 1, the fit angle is 1-7 degrees, the external taper of the conical sleeve is α degrees, the taper of an internal taper hole of the extrusion sleeve is β degrees, and the external taper α of the conical sleeve is 0.1-1 degrees larger than the taper β of the internal taper hole of the extrusion sleeve (see fig. 2-1 and 3).
As shown in the figures 2-1, 2-2 and 2-3, 2-6 grooves 11 are respectively formed at two ends of the conical sleeve 1, the length L of each groove is 1/5-9/10 of the length of the conical sleeve 1, the width K of each groove is 0.5-5 mm, and the depth S of each groove penetrates through the outer surface to the inner surface of the conical sleeve.
As shown in fig. 2-4, the inner hole of the conical sleeve is of an inverted tooth-shaped thread structure 12, and after being stressed, the thread is embedded into the outer layer steel wire of the steel strand with the multi-layer steel wire structure.
The manufacturing method of the fixed end anchorage of the multilayer steel wire structure steel strand is characterized in that the extrusion sleeve, the conical sleeve and the multilayer steel wire structure steel strand are integrated into a whole in an extrusion anchoring mode through reducing extrusion equipment, so that the fixed end anchorage of the multilayer steel wire structure steel strand is formed, and the extrusion anchoring method comprises the following steps: A. preparing and discharging: B. assembling: c. Extruding and D, finishing four steps of extruding; because the manufacturing method does not belong to the protection scope of the utility model, the concrete method of the extrusion anchoring method is not repeated.
As a transformation of the embodiment of the utility model, the utility model discloses a stiff end ground tackle of multilayer steel wire structure steel strand wires still can be applied to and make the cable for the structure, all extrudees at the both ends of certain long steel strand wires promptly the utility model discloses a stiff end ground tackle of multilayer steel wire structure steel strand wires makes instrument cable or for the structure cable promptly.
Claims (3)
1. A fixed end anchorage of a multi-layer steel wire structure steel strand relates to an extrusion type anchorage, which comprises the multi-layer steel wire structure steel strand and an extrusion sleeve and is characterized by further comprising a conical sleeve (1), wherein the conical sleeve (1) is positioned between the multi-layer steel wire structure steel strand (3) and the extrusion sleeve (2), the extrusion sleeve (2) is in conical fit with the conical sleeve (1), the fit angle is 1-7 degrees, the external taper of the conical sleeve is α degrees, the taper of an internal taper hole of the extrusion sleeve is β degrees, and the external taper α degree of the conical sleeve is 0.1-1 degrees larger than the taper β degree of the internal taper hole of the extrusion sleeve.
2. The anchor of claim 1, wherein the anchor comprises: 2-6 grooves (11) are radially formed at two ends of the conical sleeve (1).
3. The anchor of claim 1 or 2, wherein the anchor comprises: the inner hole of the conical sleeve is of an inverted tooth-shaped thread structure (12), and the thread is embedded into the steel strand of the multilayer steel wire structure after stress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920703871.8U CN210459771U (en) | 2019-05-16 | 2019-05-16 | Fixed end anchorage device of multi-layer steel wire structure steel strand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920703871.8U CN210459771U (en) | 2019-05-16 | 2019-05-16 | Fixed end anchorage device of multi-layer steel wire structure steel strand |
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| CN210459771U true CN210459771U (en) | 2020-05-05 |
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| CN201920703871.8U Active CN210459771U (en) | 2019-05-16 | 2019-05-16 | Fixed end anchorage device of multi-layer steel wire structure steel strand |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185198A (en) * | 2019-05-16 | 2019-08-30 | 广西科技大学鹿山学院 | A kind of fixing end anchorage and preparation method thereof of multilayer steel wire structural steel twisted wire |
| CN114042842A (en) * | 2021-11-11 | 2022-02-15 | 柳州市威尔姆预应力有限公司 | Single-oil-way hydraulic cotton gin with automatic return stroke and loosening function |
-
2019
- 2019-05-16 CN CN201920703871.8U patent/CN210459771U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185198A (en) * | 2019-05-16 | 2019-08-30 | 广西科技大学鹿山学院 | A kind of fixing end anchorage and preparation method thereof of multilayer steel wire structural steel twisted wire |
| CN114042842A (en) * | 2021-11-11 | 2022-02-15 | 柳州市威尔姆预应力有限公司 | Single-oil-way hydraulic cotton gin with automatic return stroke and loosening function |
| CN114042842B (en) * | 2021-11-11 | 2024-04-19 | 柳州市威尔姆预应力有限公司 | Hydraulic cotton gin with single oil way and automatic return stroke and loose clamp |
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