CN215671164U - Secondary stretch-draw is with low stretch-draw frock that contracts - Google Patents
Secondary stretch-draw is with low stretch-draw frock that contracts Download PDFInfo
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- CN215671164U CN215671164U CN202120584599.3U CN202120584599U CN215671164U CN 215671164 U CN215671164 U CN 215671164U CN 202120584599 U CN202120584599 U CN 202120584599U CN 215671164 U CN215671164 U CN 215671164U
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Abstract
The utility model relates to the technical field of tensioning tools, and discloses a low-retraction tensioning tool for secondary tensioning, which is characterized by comprising a low-retraction nut and a connecting nut which are screwed on the first external thread, a tensioning rod fixedly connected with the connecting nut, a reaction frame for jacking the anchor backing plate, and a jack fixedly connected with the reaction frame, wherein the low-retraction nut and the connecting nut are connected with the low-retraction anchor plate through the first external thread on the low-retraction anchor plate; the low retraction nut is positioned between the low retraction anchor plate and the connecting nut; the tension rod is fixedly connected with the moving end of the jack.
Description
Technical Field
The utility model relates to the technical field of tensioning tools, in particular to a low-retraction tensioning tool for secondary tensioning.
Background
In a short-beam prestress system, the stretching and stretching retraction amount of a common anchorage device is too large, and the prestress loss is large, so that the effective prestress is insufficient; the low-retraction anchor can be used as a high-strength anchor, can solve the problems, and can be widely applied to various short prestressed tendon structures such as a vertical prestressed structure of a bridge, a transverse prestressed structure of a railway beam and the like.
The low-retraction anchor adopts a secondary tensioning mode to make up for the defect of overlarge retraction in the primary tensioning process. During secondary tensioning, the low-retraction anchor plate needs to be tensioned, and the low-retraction nut is screwed, so that the common anchor tensioning tool cannot meet the requirement of secondary tensioning.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a low-retraction tensioning tool for secondary tensioning.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a low-retraction tensioning tool for secondary tensioning is connected with a low-retraction anchor plate through a first external thread on the low-retraction anchor plate, and pulls the low-retraction anchor plate out of an anchor backing plate; the low retraction nut is positioned between the low retraction anchor plate and the connecting nut; the tension rod is fixedly connected with the moving end of the jack.
Furthermore, a second external thread is arranged at the joint of the tension rod and the connecting nut; and the tensioning rod is fixedly connected with the connecting nut through a second external thread.
Further, a tightening nut is included; a third external thread is arranged at one end of the tensioning rod, which is far away from the connecting nut; and the screwing nut is screwed on the third external thread, and the end face of the screwing nut is overlapped on the end face of the jack.
Furthermore, the interior of the tension rod is of a hollow structure.
Further, one end of the connecting nut, which is close to the low-retraction nut, is provided with a taper.
Compared with the prior art, the utility model has the beneficial technical effects that:
1. the low-retraction anchor plate is fixed with the tension rod in a threaded connection mode, when the jack is ejected out, the low-retraction anchor plate is pulled out from the original position through the tension rod, and the low-retraction nut is screwed towards the direction of the low-retraction anchor plate, so that the low-retraction nut is attached to the anchor backing plate, and secondary tensioning is realized.
2. The utility model connects two parts by screw thread, which has high strength and light weight; because the tension rod only bears the pulling force, the interior of the tension rod can be set to be a hollow structure, the weight can be reduced, and the strength requirement can be met.
3. The front end of the connecting nut is of a conical structure, so that a tool can be conveniently used for screwing the low-retraction nut, and the connecting nut is prevented from interfering with an operating tool.
Drawings
Fig. 1 is a schematic structural view of the whole of the present invention.
Detailed Description
A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a low-retraction tensioning tool for secondary tensioning is connected with a low-retraction anchor plate through a first external thread on a low-retraction anchor plate 7, pulls the low-retraction anchor plate out of an anchor backing plate 8, and comprises a low-retraction nut 6 and a connecting nut 1 screwed on the first external thread, a tensioning rod 2 fixedly connected with the connecting nut, a reaction frame 3 for jacking the anchor backing plate, and a jack 5 fixedly connected with the reaction frame; the low retraction nut is positioned between the low retraction anchor plate and the connecting nut; the tension rod is fixedly connected with the moving end of the jack.
The low-retraction anchor adopts a secondary tensioning mode to make up for the defect of overlarge retraction in the primary tensioning process. And during secondary tensioning, tensioning the low-retraction anchor plate.
The low-retraction anchor plate is fixed with the tension rod in a threaded connection mode, when the jack is ejected out, the low-retraction anchor plate is pulled out from the original position through the tension rod, and the low-retraction nut is screwed towards the direction of the low-retraction anchor plate, so that the low-retraction nut is attached to the anchor backing plate, and secondary tensioning is realized.
The reaction frame and the tension rod are installed in a centering mode, and the central axes of the reaction frame, the tension rod and the jack are located on the same straight line.
As shown in fig. 1, a second external thread is arranged at the joint of the tension rod and the connecting nut; and the tensioning rod is fixedly connected with the connecting nut through a second external thread.
As shown in fig. 1, comprises a tightening nut 4; a third external thread is arranged at one end of the tensioning rod, which is far away from the connecting nut; and the screwing nut is screwed on the third external thread, and the end face of the screwing nut is overlapped on the end face of the jack.
As shown in fig. 1, the interior of the tension rod is a hollow structure.
The common tensioning tool is heavy, the size of the lower end part of the tensioning rod component is large, the universality is poor, and the operation is difficult; the utility model connects two parts by screw thread, which has high strength and light weight; because the tension rod only bears the pulling force, the interior of the tension rod can be set to be a hollow structure, the weight can be reduced, and the strength requirement can be met.
As shown in fig. 1, the end of the coupling nut adjacent the low retraction nut is tapered.
When carrying out secondary stretch-draw, need utilize the instrument to twist low back nut to low back anchor slab, in order to avoid interfering, set up the one end that the coupling nut is close to low back nut into the toper to the operation is convenient for.
The reaction frame in the prior art has low strength, but the tensioning tool needs to be repeatedly recycled, and the conventional reaction frame is easy to deform after being used for many times, so that the service life of the reaction frame is influenced; according to the reaction frame, the reaction frame is provided with the multiple inclined struts, so that the structural stability and the overall strength can be improved.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A low-retraction tensioning tool for secondary tensioning is connected with a low-retraction anchor plate through a first external thread on the low-retraction anchor plate, and pulls the low-retraction anchor plate out of an anchor backing plate; the low retraction nut is positioned between the low retraction anchor plate and the connecting nut; the tension rod is fixedly connected with the moving end of the jack.
2. A low retraction tensioning tool for secondary tensioning according to claim 1, characterized in that: a second external thread is arranged at the joint of the tension rod and the connecting nut; and the tensioning rod is fixedly connected with the connecting nut through a second external thread.
3. A low retraction tensioning tool for secondary tensioning according to claim 1, characterized in that: comprises screwing a nut; a third external thread is arranged at one end of the tensioning rod, which is far away from the connecting nut; and the screwing nut is screwed on the third external thread, and the end face of the screwing nut is overlapped on the end face of the jack.
4. A low retraction tensioning tool for secondary tensioning according to claim 1, characterized in that: the inside of stretch-draw pole is hollow structure.
5. A low retraction tensioning tool for secondary tensioning according to claim 1, characterized in that: one end of the connecting nut, which is close to the low retraction nut, is arranged to be conical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120584599.3U CN215671164U (en) | 2021-03-19 | 2021-03-19 | Secondary stretch-draw is with low stretch-draw frock that contracts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120584599.3U CN215671164U (en) | 2021-03-19 | 2021-03-19 | Secondary stretch-draw is with low stretch-draw frock that contracts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215671164U true CN215671164U (en) | 2022-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120584599.3U Active CN215671164U (en) | 2021-03-19 | 2021-03-19 | Secondary stretch-draw is with low stretch-draw frock that contracts |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215671164U (en) |
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2021
- 2021-03-19 CN CN202120584599.3U patent/CN215671164U/en active Active
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