CN212317318U - Prestressed concrete stretch-draw stiff end extrusion formula anchor structure - Google Patents
Prestressed concrete stretch-draw stiff end extrusion formula anchor structure Download PDFInfo
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- CN212317318U CN212317318U CN202022084227.2U CN202022084227U CN212317318U CN 212317318 U CN212317318 U CN 212317318U CN 202022084227 U CN202022084227 U CN 202022084227U CN 212317318 U CN212317318 U CN 212317318U
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Abstract
The utility model discloses a prestressed concrete stretch-draw stiff end extrusion formula anchor structure, including stretch-draw anchor slab, with the anchor pad cover that the interior terminal surface of stretch-draw anchor slab links to each other, with the bellows that the terminal surface of anchor pad cover links to each other, and wear to establish in proper order stretch-draw anchor slab the anchor pad cover a plurality of prestressing lines in the bellows, it is used for fastening each to be provided with a plurality of on the outer terminal surface of stretch-draw anchor slab stretch out the end so that it keeps the extrusion ground tackle of predetermineeing length. In this way, each prestressed line is sequentially arranged in the tensioning anchor plate, the anchor pad sleeve and the corrugated pipe in a penetrating manner, so that the part of each prestressed line at the fixed end is protected, each prestressed line is prevented from directly contacting with external concrete, and corrosion is avoided; meanwhile, the anchoring length of the prestressed lines can be controlled within a proper range by extrusion fixing and length limitation of the extrusion anchorage device on the extending ends of the prestressed lines, so that the prestressed application length is prevented from being too long or too short.
Description
Technical Field
The utility model relates to a civil engineering technical field, in particular to prestressed concrete stretch-draw stiff end extrusion formula anchor structure.
Background
With the development of civil engineering technology, civil engineering facilities of different structural forms are widely used.
Bridge design construction is a typical application example of civil engineering technology, and engineering construction control aims to ensure the reliability and safety of a structure in a construction process and ensure that the stress state of a bridge meets design requirements. For the prestressed bridge, the prestressed construction control is a main factor influencing the realization of the bridge construction control target, and the prestressed construction control is the core of the prestressed bridge, which is related to the internal force and the structural safety of the main beam. Therefore, the development of the research on the prestress construction technology is of great significance.
Due to the linear, attractive and functional requirements, a multi-connected multi-span cast-in-place prestressed concrete continuous beam bridge often needs to be constructed, in the design of the multi-connected cast-in-place prestressed concrete continuous beam bridge, the space of a beam end of each connection is limited, the requirement of a prestressed tensioning space is difficult to meet, and the tensioning mode of prestressed steel strands inevitably adopts single-end tensioning.
At present, the single-end tensioning fixed end is anchored by a square extrusion type anchorage device most commonly used, but the distance between a fixed anchor plate and a restraint ring is difficult to control, if the distance between the fixed anchor plate and the restraint ring is too short, the anchoring length of a prestressed steel strand is too short, the holding force of the prestressed steel strand is insufficient, the steel strand is easy to slide in concrete, and quality accidents are easy to cause; on the contrary, if the anchoring length of the prestressed steel strand is too long, the prestress application length is reduced, resulting in insufficient prestress. More importantly, in the construction process, the prestressed steel strands are directly bonded with concrete, so that the corrosion degree of the prestressed steel strands is aggravated, the quality problem is easily caused, the limit bearing capacity of the bridge is reduced, the safety of the bridge structure is further influenced, and even the prestressed steel strands fail to work, so that the bridge accident is caused.
Therefore, how to ensure that the prestressed concrete tensioning fixed end has a proper anchoring length, and simultaneously, the direct bonding of the prestressed line and the concrete to cause corrosion is avoided, and the tensile strength of the concrete is improved is a technical problem faced by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a prestressed concrete stretch-draw stiff end extrusion formula anchor structure can ensure that prestressed concrete stretch-draw stiff end has suitable anchor length, avoids prestressing line and concrete direct bonding to cause the corruption simultaneously, improves concrete tensile compression strength.
For solving the technical problem, the utility model provides a prestressed concrete stretch-draw stiff end extrusion formula anchor structure, including stretch-draw anchor slab, with the anchor pad cover that the interior terminal surface of stretch-draw anchor slab links to each other, with the bellows that the terminal surface of anchor pad cover links to each other, and wear to establish in proper order stretch-draw anchor slab the anchor pad cover a plurality of prestressing force lines in the bellows, it is used for fastening each to be provided with a plurality of on the outer terminal surface of stretch-draw anchor slab stretch out the end so that it keeps the extrusion ground tackle of predetermineeing length.
Preferably, the end face of the tension anchor plate is provided with a plurality of through holes for the prestressed lines to pass through, each through hole is conical, the small end face of each through hole faces the outer end face, and the large end face of each through hole faces the inner end face.
Preferably, each extrusion anchor is cylindrical and is respectively sleeved on the extending end of each prestressed line; and each extrusion anchorage device is respectively pressed on each through hole.
Preferably, the outer end face of the anchor cushion cover is provided with a centering groove in the central area, and the tensioning anchor plate is installed in the centering groove.
Preferably, the inner end surface of the anchor cushion cover is in sealing butt joint with the pipe orifice of the corrugated pipe.
Preferably, a sealing ring for sealing a gap is arranged at the connecting position of the anchor cushion cover and the corrugated pipe.
Preferably, the sealing ring is externally sleeved with a plurality of rings of elastic hoops.
Preferably, the outer end surface of the anchor cushion cover is provided with a grouting hole communicated with the inside of the anchor cushion cover and used for guiding cement paste.
Preferably, a plurality of connecting holes are formed in the outer end face of the anchor cushion cover along the circumferential direction, a positioning rod extending along the axial direction is inserted and installed in each connecting hole, a spiral rib is sleeved on the outer surface of the anchor cushion cover, and the outer edge of the spiral rib is fixed to the positioning rod.
Preferably, the length of the positioning rod accounts for 50% -100% of the axial length of the spiral rib, and the diameter of the positioning rod is 6-16 mm.
The utility model provides a prestressed concrete stretch-draw stiff end extrusion formula anchor structure mainly includes stretch-draw anchor slab, anchor pad cover, bellows, prestressing line and extrusion ground tackle. The tensioning anchor plate and the anchor cushion sleeve are connected with each other, and the inner end face of the tensioning anchor plate is tightly attached to the outer end face of the anchor cushion sleeve. Meanwhile, the anchor cushion cover is connected with the corrugated pipe, and the inner end face of the anchor cushion cover is tightly attached to the inner end face of the corrugated pipe. The tension anchor plate, the anchor cushion sleeve and the corrugated pipe are sequentially connected along the axial direction, and each prestress line sequentially penetrates through the tension anchor plate, the anchor cushion sleeve and the corrugated pipe and extends out of two ends of the tension anchor plate, the anchor cushion sleeve and the corrugated pipe. And the extrusion anchorage device is arranged on the outer end surface of the tensioning anchor plate, and the extending end of each prestressed line penetrating through the outer end surface of the tensioning anchor plate is clamped and fixed, so that the extending end of each prestressed line is kept within a preset length range, and the prestress application length of each prestressed line is kept within an appropriate range. Therefore, the prestressed concrete tension fixed end extrusion type anchoring structure provided by the utility model sequentially passes through each prestressed line inside the tension anchor plate, the anchor pad sleeve and the corrugated pipe, so as to form external protection for the part of each prestressed line at the fixed end, further prevent each prestressed line from directly contacting with external concrete, and avoid corrosion; meanwhile, the anchoring length of each prestressed line can be controlled within a proper range by extrusion fixing and length limitation of the extrusion anchorage device on the extending end of each prestressed line, so that the excessive length or the excessive short length of the prestressed application is avoided. To sum up, the utility model provides a prestressed concrete stretch-draw stiff end extrusion formula anchor structure can ensure that prestressed concrete stretch-draw stiff end has suitable anchor length, avoids prestressing line and concrete direct bonding to cause the corruption simultaneously, improves concrete tensile compression strength.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic overall structure diagram of a specific embodiment of the present invention.
Fig. 2 is a left side view of fig. 1.
Fig. 3 is a partial structural schematic diagram of fig. 1.
Wherein, in fig. 1-3:
the anchor plate tensioning device comprises a tensioning anchor plate-1, an anchor pad sleeve-2, a corrugated pipe-3, a prestressed line-4, an extrusion anchor-5, a sealing ring-6, an elastic hoop-7, a positioning rod-8 and a spiral rib-9;
through hole-11, outer end face-21, centering groove-22, mud jacking hole-23, connecting hole-24, and extension end-41.
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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic diagram of an overall structure of an embodiment of the present invention.
The utility model provides an among the specific embodiment, prestressed concrete stretch-draw stiff end extrusion formula anchor structure mainly includes stretch-draw anchor slab 1, anchor pad cover 2, bellows 3, prestressing force line 4 and extrusion ground tackle 5.
Wherein, the tensioning anchor plate 1 is connected with the anchor pad sleeve 2, and the inner end surface of the tensioning anchor plate 1 is tightly attached to the outer end surface 21 of the anchor pad sleeve 2. Meanwhile, the anchor pad sleeve 2 and the corrugated pipe 3 are connected with each other, and the inner end surface of the anchor pad sleeve 2 and the inner end surface of the corrugated pipe 3 are tightly attached to each other.
The tension anchor plate 1, the anchor pad sleeve 2 and the corrugated pipe 3 are sequentially connected along the axial direction, and each prestressed line 4 sequentially penetrates through the three and extends out of two ends.
And the extrusion anchorage device 5 is arranged on the outer end surface 21 of the tensioning anchor plate 1, and the extension end 41 of each prestressed line 4 penetrating through the outer end surface 21 of the tensioning anchor plate 1 is clamped and fixed, so that the extension end 41 of each prestressed line 4 is kept in a preset length range, the prestress application length of each prestressed line 4 is kept in a proper range, generally, the sum of the prestress application length and the anchoring length is the total length of the prestressed line 4, the anchoring length mainly refers to the length of the prestressed line 4 in a fixed end anchoring structure, and the anchoring length can be adjusted by adjusting the extrusion fixing position of the extrusion anchorage device 5 on each prestressed line 4 under the condition that the total length is kept unchanged.
Thus, in the prestressed concrete tension fixed end extrusion type anchoring structure provided by the embodiment, each prestressed line 4 sequentially penetrates through the tension anchor plate 1, the anchor pad sleeve 2 and the corrugated pipe 3, so that the part of each prestressed line 4 at the fixed end forms external protection, and each prestressed line 4 is prevented from directly contacting with external concrete to avoid corrosion; meanwhile, the extrusion fixing and the length limitation of the extension end 41 of each prestressed line 4 are carried out through the extrusion anchorage device 5, the anchoring length of each prestressed line 4 can be controlled within a proper range, and the excessive length or the excessive short length of the applied prestressed force is avoided.
In conclusion, the extrusion type anchoring structure for the prestressed concrete tensioning fixed end can ensure that the prestressed concrete tensioning fixed end has a proper anchoring length, avoids corrosion caused by direct bonding of a prestressed line and concrete, and improves tensile and compressive strength of the concrete.
As shown in fig. 2, fig. 2 is a left side view of fig. 1.
In a preferred embodiment of the tension anchor plate 1, a plurality of through holes 11 are opened on the end surface of the tension anchor plate 1, and each through hole 11 is used for each prestressed line 4 to pass through. In general, the tension anchor plate 1 has a disk shape, and the through holes 11 may be uniformly formed in the circumferential direction on the surface of the tension anchor plate 1, and may be formed in 4 to 12 pieces. Specifically, each through hole 11 is tapered, with one end being large and the other end being small, and the small end face being directed towards the outer end face 21 of the tension anchor plate 1 and the large end face being directed towards the inner end face of the tension anchor plate 1.
In a preferred embodiment of the extrusion anchorage device 5, the extrusion anchorage device 5 is cylindrical and is respectively sleeved on the extending ends 41 of the prestressed wires 4, and the extending ends 41 of the prestressed wires 4 are fixed by means of extrusion fastening. Generally, the length of the extension end 41 of each prestressed wire 4 can be conveniently adjusted by pressing and fastening the extension end 41 of each prestressed wire 4 at different positions, and the length of the extension end 41 of each prestressed wire 4 can be determined in advance according to the requirement of the prestress application length during construction. Simultaneously, each extrusion anchor 5 is also pressed against each through hole 11, so that each pre-stressed line 4 conveniently passes through the through hole 11.
In a preferred embodiment of the anchor pad casing 2, the outer end face 21 of the anchor pad casing 2 is provided with centering grooves 22, and the tension anchor plate 1 is specifically mounted in the centering grooves 22. Specifically, the middle of the outer end surface 21 of the anchor pad sleeve 2 is hollow so as to facilitate the passing of each prestressed line 4, and the centering groove 22 is opened in the central area of the outer end surface 21 of the anchor pad sleeve 2 and is annular and close to the edge of the outer end surface 21 of the anchor pad sleeve 2. The tensioning anchor plate 1 is positioned by being installed in the centering groove 22.
In addition, considering that the space between the corrugated pipe 3 and the prestressed line 4 needs to be sealed in the construction process, the conventional method is to fill polyurethane foam caulking agent between the corrugated pipe 3 and the prestressed line 4, but the density of the sealing section of the polyurethane foam caulking agent is not enough, so that the moisture in the external concrete is easy to invade, the prestressed line 4 is corroded, and when the grout outlet plastic pipe is inserted too short, the polyurethane foam caulking agent enters the grout outlet plastic pipe to block the grout outlet pipe, so that the grout outlet pipe cannot be grouted, for this reason, the outer end face 21 of the anchor pad sleeve 2 is further provided with grout pressing holes 23. Specifically, the tail end of the mud jacking hole 23 is communicated with the inner space of the anchor pad sleeve 2 and is mainly used for guiding cement slurry into the anchor pad sleeve 2, so that the gaps between the anchor pad sleeve 2 and the corrugated pipe 3 and the prestressed lines 4 are filled with the cement slurry for sealing, and the water of external concrete is prevented from being immersed into the gaps.
As shown in fig. 3, fig. 3 is a partial structural schematic diagram of fig. 1.
Further, in order to prevent external concrete from infiltrating into the anchor pad sleeve 2 and the corrugated pipe 3 to corrode the prestressed lines 4, in this embodiment, the inner end surface of the anchor pad sleeve 2 is in sealed butt joint with the pipe orifice of the corrugated pipe 3. Specifically, in this embodiment, a sealing ring 6 is disposed at the connection position of the anchor pad 2 and the corrugated pipe 3, so that the connection gap between the two is sealed by the sealing ring 6. Generally, the sealing ring 6 can be made of silicone rubber.
In order to improve the sealing performance of the sealing ring 6 to the connecting position of the anchor pad sleeve 2 between the corrugated pipes 3, a plurality of elastic hoops 7 are further sleeved on the outer surface of the sealing ring 6. Specifically, the elastic hoop 7 has elasticity, and can be tightly sleeved at the two ends of the sealing ring 6 after being expanded by a certain degree of elasticity, so that the sealing performance of the sealing ring 6 is enhanced through elastic deformation.
In addition, in order to improve the compressive strength of the concrete structure, the outer surface of the anchor pad sleeve 2 is sleeved with a spiral rib 9. Meanwhile, considering that the fixed-end extrusion type anchoring structure is generally arranged in the end beam and the fixing of the spiral rib 9 is difficult, for this reason, a plurality of connecting holes 24, such as 2-4 connecting holes, are formed in the outer end face 21 of the anchor pad sleeve 2 along the circumferential direction in the embodiment, and the positioning rod 8 is inserted and installed in each connecting hole 24. Specifically, this locating lever 8 extends along the axial direction of anchor pad sleeve 2 to the outer fringe of anchor pad sleeve 2 is fixed on each locating lever 8, for example through welding or ligature fixed etc.. In order to facilitate disassembly and assembly, one end of the positioning rod 8 can be in threaded connection with the connecting hole 24 through threads. The length of the positioning rod 8 is generally 50% to 100% of the axial length of the spiral rib 9, so that the spiral rib 9 can be conveniently fixed. Meanwhile, the diameter of the positioning rod 8 is generally 6-16 mm, and the positioning rod has enough structural strength.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a prestressed concrete stretch-draw stiff end extrusion formula anchor structure, its characterized in that, including stretch-draw anchor slab (1), with anchor pad cover (2) that the interior terminal surface of stretch-draw anchor slab (1) links to each other, with bellows (3) that the terminal surface of anchor pad cover (2) links to each other, and wear to establish in proper order stretch-draw anchor slab (1), anchor pad cover (2) a plurality of prestressing lines (4) in bellows (3), it is used for fastening each to be provided with a plurality of on the outer terminal surface of stretch-draw anchor slab (1) stretching out end (41) so that its extrusion ground tackle (5) that keep preset length.
2. A prestressed concrete tensioned fixing end extrusion type anchoring structure according to claim 1, wherein a plurality of through holes (11) for the passage of each prestressed line (4) are formed in the end surface of the tensioned anchor plate (1), each through hole (11) is in a cone shape, the small end surface of each through hole (11) faces the outer end surface, and the large end surface of each through hole (11) faces the inner end surface.
3. The prestressed concrete tensioned fixed end extrusion type anchoring structure as recited in claim 2, wherein each of the extrusion anchors (5) is cylindrical and is respectively fitted over the extending ends (41) of each of the prestressed lines (4); the extrusion anchors (5) are respectively pressed on the through holes (11).
4. A prestressed concrete tensioned fixing end extrusion type anchoring structure according to claim 3, wherein an centering groove (22) is formed in a central region of an outer end surface (21) of the anchor cushion cover (2), and the tensioned anchor plate (1) is installed in the centering groove (22).
5. A prestressed concrete tensioned-fixed-end extrusion type anchoring structure according to claim 4, wherein an inner end face of said anchor mat cover (2) is in sealing abutment with a pipe orifice of said corrugated pipe (3).
6. A prestressed concrete tensioned fixing end extrusion type anchoring structure according to claim 5, wherein a sealing ring (6) for sealing a gap is provided at a connecting position of the anchor cushion cover (2) and the corrugated pipe (3).
7. A prestressed concrete tensioned fixing end extrusion type anchoring structure according to claim 6, wherein a plurality of rings of elastic hoops (7) are sleeved outside the sealing ring (6).
8. The prestressed concrete tensioned fixing end extrusion type anchoring structure as recited in claim 4, wherein the outer end face (21) of the anchor cushion cover (2) is provided with a grout pressing hole (23) communicated with the inside thereof for guiding in grout.
9. A prestressed concrete stretch-draw stiff end extrusion formula anchor structure of claim 8, wherein, a plurality of connecting hole (24) have been seted up along circumference on outer terminal surface (21) of anchor pad cover (2), just establish in connecting hole (24) interpolation and install locating lever (8) along axial extension, the cover is equipped with spiral muscle (9) on the surface of anchor pad cover (2), the outer fringe of spiral muscle (9) is fixed on locating lever (8).
10. The prestressed concrete tensioned fixing end extrusion type anchoring structure according to claim 9, wherein the length of the positioning rod (8) accounts for 50-100% of the axial length of the spiral rib (9), and the diameter of the positioning rod (8) is 6-16 mm.
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| CN202022084227.2U CN212317318U (en) | 2020-09-21 | 2020-09-21 | Prestressed concrete stretch-draw stiff end extrusion formula anchor structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111962769A (en) * | 2020-09-21 | 2020-11-20 | 中庆建设有限责任公司 | Prestressed concrete stretch-draw stiff end extrusion formula anchor structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111962769A (en) * | 2020-09-21 | 2020-11-20 | 中庆建设有限责任公司 | Prestressed concrete stretch-draw stiff end extrusion formula anchor structure |
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