CN215760014U - Retarded adhesive prestressed steel strand - Google Patents
Retarded adhesive prestressed steel strand Download PDFInfo
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- CN215760014U CN215760014U CN202121813708.0U CN202121813708U CN215760014U CN 215760014 U CN215760014 U CN 215760014U CN 202121813708 U CN202121813708 U CN 202121813708U CN 215760014 U CN215760014 U CN 215760014U
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Abstract
The utility model provides a slow-bonding prestressed steel strand. The anchor ring comprises a steel strand layer formed by stranding a plurality of steel wires, an outer-wrapping sheath sleeved outside the steel strand and a slow setting adhesive filled between the steel strand layer and the outer-wrapping sheath to realize bonding of the steel strand layer and the outer-wrapping sheath, wherein the outer-wrapping sheath is provided with a wavy inner sheath groove and a wavy outer sheath groove, a plurality of anchoring sleeves arranged at intervals along the axial direction are sleeved outside the outer-wrapping sheath, each anchoring sleeve comprises an anchor ring and an anchor claw radially and outwards tilting from one end of the anchor ring, the inner surface of each anchor claw forms a thrust surface which is in pushing fit with peripheral concrete, each anchor claw has elasticity to provide acting force for the anchor claws to move towards the direction far away from the axis direction of the anchor claw to tilt, each anchor ring is provided with a wavy inner anchor ring boss, each anchor ring is clamped in the outer sheath groove through the inner boss to realize axial pushing fit, and the slow setting adhesive is smeared between the inner boss of the anchor ring and the outer sheath groove. Has the advantages of strong bearing capacity and difficult slipping.
Description
Technical Field
The utility model relates to a slow-bonding prestressed steel strand.
Background
For concrete stress structures, the prestressed concrete structures are classified into three types according to the bonding mode, namely bonding prestress, non-bonding prestress and slow bonding prestress.
The bonded prestress means prestressed concrete which is completely bonded and wrapped by surrounding concrete or cement slurry. The pre-tensioned prestressed concrete and the post-tensioned prestressed concrete with a preset duct for penetrating and grouting belong to the same category.
The unbonded prestress is prestressed concrete which is free in stretching and deformation and does not bond with surrounding concrete or cement slurry, the unbonded prestress is coated with grease in the whole length and is protected by a plastic pipe in an outer sleeved mode.
In Japan of the 80 th century in the last 80 years, from the viewpoints of construction convenience and a reasonable force transmission mechanism, a novel prestressed concrete technology, namely a slow-bonding prestressed concrete technology, was developed on the basis of a bonded prestressed concrete structure and a non-bonded prestressed concrete structure. The technology has the advantages of simple and easy construction of the unbonded prestressed structure, and has a force transmission mechanism of the bonded prestressed concrete structure and excellent earthquake resistance.
The slow bonding prestress is that the prestressed steel strand is free in stretching deformation and does not bond with the surrounding slow-setting adhesive in the construction stage, and the prestressed reinforcement is bonded with the surrounding concrete through the cured slow-setting adhesive in a predetermined period after the construction is finished.
The slow-adhesion prestress technology is a new prestress technology developed after the non-adhesion prestress technology and the adhesion prestress technology. The slow bonding prestress absorbs the construction characteristic of no bonding and has the mechanical characteristic of bonding. The construction is the same as the unbonded prestress, the arrangement is flexible, and a single-hole anchor is adopted, so that corrugated pipes do not need to be penetrated, and grouting is not needed. After the delayed coagulation adhesive is solidified, the adhesive effect is finally achieved in mechanics.
The technical principle of the slow bonding prestress is as follows: the gradual transition from non-bonding to bonding between the prestressed tendon and the concrete is realized through the solidification of the slow bonding agent. The prestressed tendon can be stretched and freely deformed in the construction stage, and does not bond with the surrounding delayed coagulation adhesive, and the prestressed tendon and the surrounding concrete form an integral body through the bonding effect of the cured delayed coagulation adhesive and the surrounding concrete in a predetermined period after the construction is finished, so that the prestressed tendon and the surrounding concrete work together to achieve the adhesive effect.
As shown in fig. 1-2, the existing slow-bonding prestressed steel strand mainly consists of three parts, namely, a steel strand (bare wire), a slow-setting adhesive and an outer sheath. Outsourcing sheath is for having the fold pipe of the trapezoidal crest of a plurality of evaginations and the trapezoidal trough of indent, outsourcing sheath surface is fixed for the concrete after solidifying, outsourcing sheath internal surface bonds through the retardant adhesive with steel strand wires (bare wire), the concrete inserts the outsourcing sheath when not solidifying the state, the concrete wraps up outsourcing sheath surface completely, treat the concrete solidification back, then can realize fixing between outsourcing sheath and the concrete, when steel strand wires bear the pulling force, the pulling force that steel strand wires (bare wire) bore is transmitted for the outsourcing sheath through the retardant adhesive after solidifying, the outsourcing sheath is transmitted for the concrete after solidifying through the crest trough on its surface again. The slow-bonding prestressed steel strand has the advantages when being applied to a scene that the stress of the steel strand is small, but if being applied to a situation that the stress of the steel strand is large, the situation that the outer sheath slips relative to the concrete due to the fact that the contact area between the outer sheath and the concrete is too small can cause the situation that an anchored object collapses, and personal safety can be caused seriously.
Therefore, for some heavy-load anchoring places, a new structure and a new technology which can improve the thrust between the steel strand and the concrete, effectively avoid slipping and further improve the anchoring performance of the slow-bonding prestressed steel strand are urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a slow-bonding prestressed steel strand, which aims to solve the technical problem that the existing slow-bonding prestressed steel strand is easy to slip relative to peripheral concrete when bearing large tensile force.
The technical scheme of the utility model is realized as follows:
a slow-bonding prestressed steel strand comprises a steel strand layer formed by stranding a plurality of steel wires, an outer sheath sleeved outside the steel strand, and a slow-bonding adhesive filled between the steel strand layer and the outer sheath to realize bonding of the steel strand layer and the outer sheath, wherein the outer sheath is provided with a wavy inner sheath groove and a wavy outer sheath groove, the outer sheath is externally sleeved with a plurality of anchoring sleeves arranged at intervals along the axial direction, each anchoring sleeve comprises an anchor ring and an anchor claw radially and outwards tilted from one end of the anchor ring, the inner surface of each anchor claw forms a thrust surface matched with the peripheral concrete pushing and pushing, each anchor claw has elasticity so as to provide acting force for the anchor claws to face the direction far away from the axis direction of the anchor claw for tilting of the anchor claw, each anchor ring is provided with a wavy anchor ring inner boss, each anchor ring is clamped in a sheath outer groove through the corresponding anchor ring inner boss so as to achieve axial pushing and pushing matching, and a delayed coagulation adhesive is smeared between the anchor ring inner boss and the sheath outer groove.
On the basis of the scheme, the anchor sleeve is further improved in the following way that any two adjacent anchor sleeves are connected through two symmetrically arranged connecting ribs. All connect then to make things convenient for the location between anchor cover and the outsourcing sheath through the splice bar between a plurality of anchor covers, and an anchor cover is counterpointed the back promptly, and it is counterpointed with the anchor cover homoenergetic accuracy.
On the basis of the scheme, the anchor sleeve is further improved in the following mode, the anchor sleeve is formed by splicing an upper half sleeve and a lower half sleeve, and the upper half sleeve and the lower half sleeve are respectively provided with one connecting rib so as to realize the connection between any two adjacent upper half sleeves and the connection between any two adjacent lower half sleeves. The anchoring sleeve adopts a split structure, so that the smearing of the delayed coagulation adhesive and the installation and the positioning of the anchoring sleeve are greatly facilitated.
On the basis of the scheme, the anchor sleeve is further improved to be made of steel.
By adopting the technical scheme, the utility model has the beneficial effects that: filling a delayed coagulation adhesive between an outer sheath and a steel strand layer, uniformly coating a layer of delayed coagulation adhesive on the inner surface of an anchoring sleeve before the anchoring sleeve is sleeved on the outer sheath, then correctly sleeving the anchoring sleeve at a proper position on the outer sheath to ensure that an inner boss of an anchor ring is clamped in a groove outside the sheath, plugging slowly-bonded prestressed steel strands sleeved with a plurality of anchoring sleeves into a hole filled with a certain amount of concrete in the direction opposite to the tilting direction of an anchor claw, supplementing the concrete, wherein when the anchoring sleeves are plugged into the hole, the hole wall can extrude the anchor claw of the anchoring sleeve, the resistance of the concrete in the plugging process is added to ensure that the anchor claw has a certain amount of shrinkage in the direction close to the axis, then after the anchoring claw is static, under the action of self elasticity, the anchor claw gradually tilts until the upper edge is contacted with the inner wall of the hole to stop tilting, and the space near the anchor claw is filled by the flowing of the concrete, after the concrete and the slow-setting adhesive are sequentially solidified, the pulling force of the steel strand layer is transmitted to the outer wrapping sheath through the solidified slow-setting adhesive, the outer wrapping sheath transmits the force to the anchoring sleeve through the slow-setting adhesive and the stop matching between the anchor ring inner boss and the sheath outer groove, and the anchoring sleeve is in push-push matching with the solidified concrete through the thrust surfaces of the plurality of raised anchor claws, so that the pulling force is transmitted to the concrete.
Therefore, compared with the prior art, the outer sheath of the slow-bonding prestressed steel strand has the advantages that the inner groove of the wavy sheath and the outer groove of the sheath are improved to have deeper depth and larger bottom gradient, and the arc-shaped structure has higher bearing capacity and is difficult to slip compared with the traditional structure which has shallower depth and fixed gradient and is smaller, so that the bearing capacity between the outer sheath and the anchoring sleeve is improved, and the delayed coagulation adhesive is coated between the outer sheath and the anchoring sleeve, so that the power transmission capacity between the outer sheath and the anchoring sleeve is further improved, and the outer sheath is difficult to slip; the anchoring sleeve is arranged by utilizing the characteristics of larger thrust surface and strong thrust angle bearing capacity after the fluke is tilted, thereby greatly improving the bearing capacity between the steel strand and the peripheral concrete, ensuring that the slip between the steel strand and the peripheral concrete is basically impossible, and because the fluke has elasticity and special tilting direction, when the steel strand is inserted into the hole, the fluke can be contracted to ensure the smooth hole insertion, and can be expanded as much as possible after the hole insertion to increase the bearing area between the fluke and the concrete, thereby improving the bearing capacity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic longitudinal sectional structure view of a slow-adhesion prestressed steel strand in the prior art;
fig. 2 is a schematic cross-sectional structure view of a retard-bonded prestressed steel strand in the prior art;
FIG. 3 is a schematic cross-sectional view of a retarded adhesive prestressed steel strand according to the present invention;
FIG. 4 is a cross-sectional view taken at A-A of FIG. 3;
FIG. 5 is a schematic structural view of the upper half sleeve and the lower half sleeve of the anchoring sleeve when being installed on the outer sheath;
FIG. 6 is a schematic longitudinal sectional view of the retarded adhesive prestressed steel strand of the present invention in use;
FIG. 7 is a front view of the upper half (same as the lower half);
in FIGS. 1-2: 01-outer sheath, 02-retarding adhesive, 03-steel strand layer (bare wire);
in FIGS. 3-7: 1-steel strand layer, 2-retarding adhesive, 3-outer sheath, 31-inner sheath groove, 32-outer sheath groove, 4-anchoring sleeve, 41-upper half sleeve, 42-lower half sleeve, 43-connecting rib, 44-anchoring ring, 441-inner anchoring ring boss, 45-anchor claw, 451-thrust surface, 5-rock wall and 6-concrete.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The utility model relates to a concrete embodiment of a slow-bonding prestressed steel strand, which comprises the following steps: as shown in fig. 3-7, the slow-bonding prestressed steel strand includes a steel strand layer 1 formed by twisting a plurality of steel wires, an outer-wrapped sheath 3 sleeved outside the steel strand, and a slow-setting adhesive 2 filled between the steel strand layer 1 and the outer-wrapped sheath 3 to bond the steel strand layer 1 and the outer-wrapped sheath, the steel strand layer 1 needs to be stabilized, the material of the outer-wrapped sheath 3 is preferably made of metal material to provide bearing capacity, the outer-wrapped sheath 3 has a wavy sheath inner groove 31 and a sheath outer groove 32, the sheath inner groove 31 and the sheath outer groove 32 are all formed by annular grooves arranged at intervals along the axial direction, and the cross section of each annular groove is arc-shaped. The outer sheath 3 is externally sleeved with a plurality of anchoring sleeves 4 arranged at intervals along the axial direction, each anchoring sleeve 4 comprises an anchoring ring 44 and a fluke 45 radially and radially tilting outwards from one end of the anchoring ring 44, the inner surface of each fluke 45 forms a thrust surface 451 pushing and matching with peripheral concrete, each fluke 45 has elasticity so as to provide acting force for each fluke 45 towards the direction far away from the axial direction of the fluke 45 for tilting of the fluke 45, each anchoring ring 44 is provided with a wavy anchoring ring inner boss 441, each anchoring ring inner boss 441 also comprises a plurality of annular bosses arranged at intervals along the axial direction, and the cross section of each annular boss is arc-shaped. The anchor ring 44 is clamped in the sheath outer groove 32 through the anchor ring inner boss 441 to realize axial pushing fit, and a delayed coagulation adhesive 2 is coated between the anchor ring inner boss 441 and the sheath outer groove 32.
In this embodiment, more specifically, any two adjacent anchoring sleeves 4 are connected by two symmetrically arranged connecting ribs 43. All connect then to make things convenient for the location between anchor cover 4 and the outsourcing sheath 3 through splice bar 43 between a plurality of anchor covers 4, promptly after an anchor cover 4 counterpoints, it can accurate counterpoint with anchor cover 4 homoenergetic. The anchoring sleeve 4 is formed by splicing an upper half sleeve 41 and a lower half sleeve 42, and the connecting ribs 43 are respectively arranged on the upper half sleeve 41 and the lower half sleeve 42 so as to realize the connection between any two adjacent upper half sleeves 41 and the connection between any two adjacent lower half sleeves 42. The anchoring sleeve 4 adopts a split structure, so that the smearing of the delayed coagulation adhesive 2 and the installation and positioning of the anchoring sleeve 4 are greatly facilitated. The anchoring sleeve 4 is made of steel.
When the utility model is used, a retarding adhesive 2 is filled between an outer sheath 3 and a steel strand layer 1, before an anchoring sleeve 4 is sleeved on the outer sheath 3, a layer of retarding adhesive 2 is uniformly coated on the inner surface of the anchoring sleeve 4, then the anchoring sleeve 4 is correctly sleeved on a proper position on the outer sheath 3 to ensure that an anchor ring inner boss 441 is clamped in a sheath outer groove 32, a plurality of retarding bonding prestressed steel strands sleeved with the anchoring sleeve 4 are inserted into a hole filled with a certain amount of concrete in the direction opposite to the tilting direction of an anchor claw 45, after the concrete is supplemented, when the hole is inserted, the hole wall can extrude the anchor claw 45 of the anchoring sleeve 4, and the resistance of the concrete in the inserting process is added, so that the anchor claw 45 has a certain amount of shrinkage towards the direction close to an axis, then after the device is static, the anchor claw 45 gradually tilts up under the action of self elasticity until the upper edge is contacted with the inner wall of the hole to stop tilting continuously, the space near the anchor claw 45 is filled up by the flowing of the concrete, after the concrete and the slow-setting adhesive 2 are sequentially set, the pulling force of the steel strand layer 1 is transmitted to the outer sheath 3 through the set slow-setting adhesive 2, the outer sheath 3 transmits the force to the anchoring sleeve 4 through the slow-setting adhesive 2 and the structural stop matching between the anchor ring inner boss 441 and the sheath outer groove 32, and the anchoring sleeve 4 is in push matching with the set concrete through the thrust surfaces 451 of the plurality of raised anchor claws 45, so that the pulling force is transmitted to the concrete.
It can be seen that, compared with the prior art, the outer sheath 3 of the slow bonding prestressed steel strand has the advantages that the outer sheath 3 is provided with the wavy inner sheath groove 31 and the wavy outer sheath groove 32 which have deeper depth and larger bottom gradient, and the arc-shaped structure has higher bearing capacity and is difficult to slip compared with the traditional structure which has shallower depth and fixed gradient and is smaller, so that the bearing capacity between the outer sheath 3 and the anchoring sleeve 4 is improved, and the delayed coagulation adhesive 2 is smeared between the outer sheath 3 and the anchoring sleeve 4, so that the power transmission capacity between the outer sheath 3 and the anchoring sleeve is further improved, and the slipping is more difficult; the anchoring sleeve 4 is arranged by utilizing the characteristics of larger thrust surface 451 and strong thrust angle bearing capacity after the fluke 45 is tilted, thereby greatly improving the bearing capacity between the steel strand and the peripheral concrete, ensuring that the slip between the steel strand and the peripheral concrete is basically impossible, and because the fluke 45 has elasticity and special tilting direction, when the steel strand is inserted into the hole, the fluke 45 can be contracted to ensure the smooth hole insertion, and can be expanded as much as possible after the hole insertion to increase the bearing area between the anchor 45 and the concrete, thereby improving the bearing capacity.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A slow-bonding prestressed steel strand comprises a steel strand layer formed by stranding a plurality of steel wires, an outer sheath sleeved outside the steel strand, and a slow-bonding adhesive filled between the steel strand layer and the outer sheath to realize bonding of the steel strand layer and the outer sheath, the anchor ring is provided with a wavy anchor ring inner groove and a sheath outer groove, a plurality of anchor sleeves arranged at intervals along the axial direction are sleeved outside the outer sheath, each anchor sleeve comprises an anchor ring and an anchor claw radially and radially outwards tilting from one end of the anchor ring, the inner surface of each anchor claw forms a thrust surface matched with the peripheral concrete pushing and pushing, each anchor claw has elasticity so as to provide acting force for the anchor claw towards the direction far away from the axis direction of the anchor claw for tilting of the anchor claw, each anchor ring is provided with a wavy anchor ring inner boss, each anchor ring is clamped in the sheath outer groove through the corresponding anchor ring inner boss so as to realize axial pushing and matching, and a delayed coagulation adhesive is smeared between the corresponding anchor ring inner boss and the sheath outer groove.
2. The retard-bonded prestressed steel strand as claimed in claim 1, wherein any two adjacent anchor sleeves are connected by two symmetrically arranged connecting bars.
3. The retard-bonded prestressed steel strand as claimed in claim 2, wherein the anchor jacket is formed by splicing an upper jacket half and a lower jacket half, and the upper jacket half and the lower jacket half are respectively provided with one of said connecting ribs, so as to realize the connection between any two adjacent upper jacket halves and the connection between any two adjacent lower jacket halves.
4. The retard-bonded prestressed steel strand as claimed in any one of claims 1 to 3, wherein the anchor jacket is made of steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121813708.0U CN215760014U (en) | 2021-08-05 | 2021-08-05 | Retarded adhesive prestressed steel strand |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121813708.0U CN215760014U (en) | 2021-08-05 | 2021-08-05 | Retarded adhesive prestressed steel strand |
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| CN215760014U true CN215760014U (en) | 2022-02-08 |
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| CN202121813708.0U Active CN215760014U (en) | 2021-08-05 | 2021-08-05 | Retarded adhesive prestressed steel strand |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115976989A (en) * | 2023-03-22 | 2023-04-18 | 天津德嘉预应力钢绞线有限公司 | Hollow prestressed steel strand |
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2021
- 2021-08-05 CN CN202121813708.0U patent/CN215760014U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115976989A (en) * | 2023-03-22 | 2023-04-18 | 天津德嘉预应力钢绞线有限公司 | Hollow prestressed steel strand |
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