CN211007319U - Beam end anchorage device for pre-tensioning method prestressed precast beam - Google Patents
Beam end anchorage device for pre-tensioning method prestressed precast beam Download PDFInfo
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- CN211007319U CN211007319U CN201921307938.2U CN201921307938U CN211007319U CN 211007319 U CN211007319 U CN 211007319U CN 201921307938 U CN201921307938 U CN 201921307938U CN 211007319 U CN211007319 U CN 211007319U
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- anchor cup
- anchorage device
- anchorage
- steel strand
- anchor
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Abstract
The utility model relates to a beam-ends ground tackle for pretensioning method prestressing force precast beam, beam-ends ground tackle includes the anchor cup, and the one end of anchor cup sets up the clamping piece for press from both sides tight steel strand wires, and anchor cup other end takes the internal thread, is used for connecting the threaded rod iron of area. By using the anchorage device, the prestress loss caused by the retraction of the clamping piece can be eliminated, and the steel strand can apply prestress to the concrete beam body within a short distance, so that the prestress effect in the transmission length of the traditional pretensioning prestressed beam is increased. Adopt the utility model discloses an anchorage device can solve traditional pretensioning prestressed beam in the not enough problem of tip transmission length within range prestressing force effect.
Description
Technical Field
The utility model belongs to the technical field of civil engineering and specifically relates to a beam-ends ground tackle for pretensioning method prestressing force precast beam is related to.
Background
At present, the steel strand anchorage of the pretensioned prestressing beam mainly depends on the bond wrapping of concrete on the steel strand, so that a section of transmission length exists at the end part of a prefabricated part, and the stress of the steel strand is gradually increased from zero to the permanent stress in the transmission length range. The transfer length is mainly related to the diameter of the steel strand, the effective prestress value of the prestressed reinforcement when the steel strand is placed in tension, the appearance of the prestressed reinforcement and the strength grade of the concrete. The transmission length is very long for large-diameter high-strength prestressed steel strands, about 1.3m or even longer. For larger span precast beams, where the shear stress near the pivot point is greater, the pre-stress provided by the pre-stressing tendons is often required to reduce the main tensile stress of the concrete near the beam ends. The prestress effect in the prestress transmission length range of the pretensioning element is smaller. Therefore, the transmission length is reduced or the transmission mode of the steel strand is changed, so that the steel strand can quickly exert the pre-compressive stress on the concrete at the beam end, and the main tensile stress near the fulcrum is reduced.
The method of arranging an anchorage device at the beam end can be adopted for solving the problem, but if the traditional clip anchor is adopted, the prestress can not be applied to the concrete beam because of the retraction of the clip. Therefore, an anchor with minimal recoil deformation must be used.
SUMMERY OF THE UTILITY MODEL
The object of the present invention is to provide a beam-end anchorage for pretensioned prestressed precast beams in order to overcome the drawbacks of the prior art.
The purpose of the utility model can be realized through the following technical scheme:
a beam end anchorage device for a pre-tensioning method prestressed precast beam is characterized by comprising an anchor cup, wherein one end of the anchor cup is provided with a clamping piece for clamping a steel strand, and the other end of the anchor cup is provided with an internal thread for connecting a steel bar with a thread.
Furthermore, the anchor cup of the anchor is a variable cross section with one thinner end and the other thicker end, or an equal cross section with the same size at the two ends.
Furthermore, the cross section of the anchor cup is round or rectangular.
Furthermore, if one end of the anchor cup is thinner and the other end is thicker, the thicker end is provided with an internal thread, the thinner end is provided with a clamping piece, and the thicker end and the thinner end of the anchor cup are connected through an inwards concave cambered surface.
Further, the anchorage device is embedded in the concrete of the beam end and is fully contacted with the concrete.
Compared with the prior art, the utility model discloses a beam-ends ground tackle for pretensioning method prestressing force precast beam can be very big reduce prestressing force stranded wire because the clamping piece of ground tackle returns the prestressing force loss that arouses that contracts, ensure on steel strand wires in shorter distance alright exert prestressing force to the concrete beam body, improve the beam-ends prestressing effect of pretensioning prestressing force beam. Adopt the utility model discloses an anchorage device can solve traditional pretensioning prestressed beam in the not enough problem of tip transmission length within range prestressing force effect.
Drawings
Fig. 1 is an elevation view of a pretensioned prestressing beam with an anchor head at an end thereof according to embodiment 1 of the present invention;
fig. 2 is a cross-sectional view of a beam end of a pretensioned prestressing beam with an anchor head according to embodiment 1 of the present invention;
fig. 3 is a schematic view of the construction of the pretensioned prestressing beam according to embodiment 1 of the present invention before the steel strand is released.
Fig. 4 is a partial enlarged view of the vicinity of the anchor according to embodiment 1 of the present invention.
Fig. 5 is a three-dimensional perspective view of an anchor according to the present invention in embodiment 1 of the present invention.
In the figure, 1-anchorage device, 2-steel strand, 3-concrete, 4-threaded steel bar, 5-reaction column, 6-tension beam, 7-jack, 8-end die, 9-bottom die, 11-anchor cup, 12-clamping piece and 13-internal thread.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example 1
A pretensioning prestressed concrete rectangular beam with an anchor head at the end part is 16m long, 0.3m wide and 1.0m high, and is provided with 4 steel strands and C50 concrete, and the structure is shown in figure 1.
The anchorage device of the utility model is arranged at the end part of the beam. The anchorage device comprises an anchor cup 11, one end of the anchor cup is provided with a clamping piece 12 for clamping the steel strand 2, and the other end of the anchor cup is provided with an internal thread 13 for connecting the threaded steel bar 4.
The pre-tensioning method prestressed precast beam mainly comprises the following construction steps:
the first step is as follows: and calculating the stress-free length of the steel strand according to the length of the member, and cutting the steel strand according to the calculated stress-free length.
The second step is that: inserting the steel strand into the thinner end of the anchor and clamping the clamping piece.
The second step is that: and placing a steel reinforcement cage and steel strands in the template and positioning.
The third step: and screwing the steel bar with the screw thread into the thicker end of the anchorage device.
The fourth step: and (5) drawing the steel bar by using a jack for tensioning.
The fifth step: and pouring and curing the concrete, wherein the anchorage device is fully wrapped by the concrete.
And a sixth step: after the requirement of releasing and opening is met, the two ends of the component are simultaneously released and opened.
The seventh step: and after the tension releasing is finished, the steel bar is screwed out of the anchorage device.
Eighth step: and hoisting, storing and sealing the anchor of the precast beam.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.
Claims (5)
1. A beam end anchorage device for a pre-tensioning method prestressed precast beam is characterized by comprising an anchor cup, wherein one end of the anchor cup is provided with a clamping piece for clamping a steel strand, and the other end of the anchor cup is provided with an internal thread for connecting a steel bar with a thread.
2. A beam end anchorage for pretensioned prestressed precast beam according to claim 1, wherein the anchorage is embedded in the beam end concrete and is in full contact with the concrete.
3. The beam-end anchorage for pretensioned prestressing of claim 1, wherein the anchor cup is of variable cross-section with one thinner end and one thicker end, or of uniform cross-section with the same dimensions at both ends.
4. The beam-end anchorage for pretensioned prestressing of claim 1, wherein the anchor cup is thinner at one end and thicker at the other end, the thicker end being provided with internal threads and the thinner end being provided with a clamping piece, said thicker and thinner ends of the anchor cup being connected by an inwardly concave curved surface.
5. The beam-end anchorage for pretensioned prestressing of claim 1, wherein the cross-section of the anchoring cup is circular or rectangular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921307938.2U CN211007319U (en) | 2019-08-13 | 2019-08-13 | Beam end anchorage device for pre-tensioning method prestressed precast beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921307938.2U CN211007319U (en) | 2019-08-13 | 2019-08-13 | Beam end anchorage device for pre-tensioning method prestressed precast beam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211007319U true CN211007319U (en) | 2020-07-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921307938.2U Active CN211007319U (en) | 2019-08-13 | 2019-08-13 | Beam end anchorage device for pre-tensioning method prestressed precast beam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211007319U (en) |
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2019
- 2019-08-13 CN CN201921307938.2U patent/CN211007319U/en active Active
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