CN112227223A

CN112227223A - A one-time top-reverse support device for low-retraction anchors

Info

Publication number: CN112227223A
Application number: CN202011240198.2A
Authority: CN
Inventors: 方蓉; 张文学; 谭豫卿; 汪志斌; 卢祥韬
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2021-01-15
Anticipated expiration: 2040-11-09
Also published as: CN112227223B

Abstract

The invention discloses a one-time top-reverse support device for a low-retraction anchor, comprising a limit plate, an outer cylinder, an inner cylinder, a bracket, a jack and a tool anchor. The bracket is a groove-shaped structure, and the bottom of the groove is There is a through hole, and the inner cylinder is fixedly connected to the peripheral side of the through hole, the outer wall of the inner cylinder is provided with threads, and the end of the inner cylinder away from the bracket is threadedly connected with a screw for pushing the limit plate. The outer cylinder, the limit plate, the bracket, the jack and the tool anchor are sequentially sleeved on the steel strand, and the direction of the notch of the bracket faces the limit plate, and the tool anchor is connected to the steel strand. The wire is detachably connected, and the jack is used to tension the steel strand. The beneficial effect of the invention is that during the low-retraction secondary tensioning process, not only the secondary top-loading link required by the traditional low-retraction secondary tensioning is reduced, but also the clip retraction and the prestressing bundle slip can be effectively controlled.

Description

One-time jacking reverse support device of low-retraction anchorage device

Technical Field

The invention relates to the technical field of bridge prestress construction, in particular to a one-time jacking reverse support device of a low-retraction anchorage device.

Background

At present, a great deal of engineering experience shows that when a conventional anchor structure, conventional tensioning equipment and a tensioning process are adopted for tensioning, pure clamping piece retraction and slippage retraction caused by the fact that the clamping piece cannot be well retracted synchronously with a steel strand can be generated in the tensioning process, so that the loss of short-bundle prestress generated in the tensioning process is up to 20% -50%. Therefore, the related scholars and units develop a secondary tension low-retraction anchor device, and the tension loss caused by clip retraction and steel bundle slippage can be reduced. However, the jack needs to be installed twice in the construction process, and the process of installing the jack is troublesome, which wastes time.

Therefore, the technical personnel in the field need to solve the problem of how to provide a primary jacking reverse support device of a low-retraction anchor which can achieve the purposes of preventing the clamping piece from retracting and controlling the prestressed tendon to slide and does not need a secondary jacking process.

Disclosure of Invention

In view of the above, the invention provides a primary jacking reverse support device of a low-retraction anchor, which solves the problems that in the prior art, a clamping piece is prevented from retracting, sliding of a prestressed tendon is controlled, and secondary jacking is required.

In order to achieve the purpose, the invention adopts the following technical scheme:

a one-shot jacking anti-backup device for a low retraction anchor, comprising: limiting plate, urceolus, inner tube, support, jack and instrument anchor, the support is cell type structure, and the recess bottom has the through-hole, just through-hole week side fixedly connected with the inner tube, the outer wall of inner tube is equipped with the screw thread, the inner tube is kept away from the one end threaded connection of support has and is used for promoting the limiting plate the urceolus, limiting plate, support, jack and instrument anchor overlap in proper order and locate on the steel strand wires, just the notch direction orientation of support the limiting plate, the instrument anchor with the connection can be dismantled to the steel strand wires, the jack is used for the stretch-draw the steel strand wires.

Further, the low ground tackle that contracts is located notch one side of support, the low ground tackle that contracts includes clamping piece, anchor slab and nut, the cylindrical structure of anchor slab for having the bell mouth, the anchor slab outer wall is equipped with the screw thread, nut threaded connection in the anchor slab outer wall, the clamping piece cover is established on the steel strand wires, the clamping piece with the limiting plate butt, the urceolus is in on the inner tube to the limiting plate spiral is close to the messenger the limiting plate will the clamping piece is impressed in the bell mouth.

Furthermore, the outer wall of the outer barrel is provided with a plurality of blind holes for rotating the outer barrel, and the blind holes are distributed on the outer wall of the outer barrel in an axial array mode.

Further, the sum of the heights of the anchor plate, the limiting plate and the inner cylinder is smaller than the depth of the groove of the support, and the sum of the heights of the anchor plate, the limiting plate, the inner cylinder and the outer cylinder is larger than the depth of the groove of the support.

Further, anchor slab, limiting plate and instrument anchor all have a plurality of wearing holes that are used for wearing to establish steel strand wires, and the three has a plurality of wearing holes are axle array distribution.

Furthermore, the diameter of the through hole in the limiting plate is smaller than the diameter of the end part of the clamping piece close to one side of the limiting plate.

According to the technical scheme, compared with the prior art, the invention discloses the primary jacking reverse support device of the low-retraction anchor, the low-retraction anchor is arranged in the groove of the support, the low-retraction anchor is combined with the limiting plate, the outer cylinder, the inner cylinder, the support, the jack and the tool anchor, only one jacking is needed in the low-retraction secondary tensioning process, the secondary jacking link required by the traditional low-retraction secondary tensioning is reduced, the clamping piece retraction and the prestressed beam slippage can be effectively controlled, and meanwhile, the primary jacking reverse support device of the low-retraction anchor is simple to manufacture and convenient to operate, so that the construction efficiency is improved.

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, 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 view of the assembled one-step jacking inverted-support device of the low-retraction anchor according to the present invention;

FIG. 2 is a schematic structural diagram of an outer barrel, an inner barrel and a bracket provided by the invention;

FIG. 3 is a sectional view of the outer cylinder, the inner cylinder and the bracket provided by the invention.

Wherein: 1 is a limit plate; 2 is an outer cylinder; 3 is an inner cylinder; 4 is a bracket; 5 is a jack; 6 is a tool anchor; 7 is a through hole; 8 is a steel strand; 9 is a low retraction anchor; 91 is a clamping piece; 92 is an anchor plate; 93 is a nut; 10 is a taper hole; 11 is a blind hole; 12 is a concrete member.

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.

Referring to fig. 1-3, an embodiment of the invention discloses a one-time jacking reverse bearing device of a low-retraction anchorage device, which comprises: the tool anchor comprises a limiting plate 1, an outer barrel 2, an inner barrel 3, a support 4, a jack 5 and a tool anchor 6, wherein the support 4 is of a groove structure, the bottom of a groove is provided with a through hole 7, the inner barrel 3 is fixedly connected to the periphery of the through hole 7, the outer wall of the inner barrel 3 is provided with threads, one end, away from the support 4, of the inner barrel 3 is connected with the outer barrel 2 used for pushing the limiting plate 1 in a threaded mode, the limiting plate 1, the support 4, the jack 5 and the tool anchor 6 are sequentially sleeved on a steel strand 8, the limiting plate 1 is pushed to move on the steel strand 8 by adjusting the meshing length of the outer barrel 2 on the inner barrel 3, the notch direction of the support 4 faces the limiting plate 1, the tool anchor 6 is detachably connected with the steel strand 8, the jack 5 is used for tensioning the steel strand 8, the outer wall of the outer barrel 2 is provided with a plurality of blind holes, the rotation of the outer cylinder 2 is then completed by inserting the handle into the blind hole 11.

In the above embodiment, in the tensioning process, the tool anchor 16 and the steel strand 4 are in a locked state, the jack 5 is extended to apply a prestress to the steel strand 8, after tensioning is finished, the tool anchor 16 can be detached from the steel strand 4, and then the jack 5, the bracket 4 and the limiting plate 1 can be detached from the steel strand 8, meanwhile, in the present embodiment, the sum of the heights of the anchor plate 92, the limiting plate 1 and the inner cylinder 3 is less than the groove depth of the bracket 4, and the sum of the heights of the anchor plate 92, the limiting plate 1, the inner cylinder 3 and the outer cylinder 2 is greater than the groove depth of the bracket 4.

Specifically, low ground tackle 9 that contracts is located notch one side of support 4, and is close to the concrete member 12 that needs to apply prestress wire 8 place, low ground tackle 9 that contracts includes clamping piece 91, anchor slab 92 and nut 93, anchor slab 92 is for having the cylindrical structure of bell mouth 10, anchor slab 92 outer wall is equipped with the screw thread, nut 93 threaded connection is in anchor slab 92 outer wall, clamping piece 91 cover is established on steel strand wires 8, clamping piece 91 and limiting plate 1 butt, urceolus 2 is close to limiting plate 1 spiral on inner tube 3 and makes limiting plate 1 impress clamping piece 91 in the bell mouth 10.

Specifically, anchor plate 92, limiting plate 1 and instrument anchor 6 all have a plurality of wearing holes that are used for wearing to establish steel strand wires 8, and a plurality of wearing holes that the three has are the distribution of axle array, steel strand wires 8 and wearing hole clearance fit, be convenient for anchor plate 92, limiting plate 1 and instrument anchor 6 slide on steel strand wires 8, wherein, the diameter that wears to establish the hole on the limiting plate 1 is less than the diameter that clamping piece 91 is close to 1 side end of limiting plate, make limiting plate 1 can be when urceolus 2 is to clamping piece 91 direction swivelling movement, limiting plate 11 provides along 8 ascending thrusts of steel strand wires for clamping piece 91, make clamping piece 91 in the bell mouth 10 on embedding anchor plate 92 under the effect of this thrust, and then die steel strand wires 8 lock in clamping piece 91.

The working principle of the one-step jacking reverse support device of the low-retraction anchorage device is as follows:

before the first tensioning, the outer cylinder 2 is rotated to enable the support 4 and the concrete member 12 to be separated by a certain distance, at the moment, the support 4 is not stressed in the tensioning process, and the tensioning process is consistent with the conventional prestress tensioning process;

after the first tension releasing, the outer cylinder 2 is rotated to enable the support 4 to be propped against the concrete member 12, at the moment, in the tensioning process, the anchor plate 92, the nut 93, the outer cylinder 2 and the inner cylinder 3 are not stressed, the clamping piece 91, the anchor plate 92 and the nut 93 are far away from the concrete member 12 along with the tensioning of the steel strand 8 applying the prestress, when the required prestress is achieved, the nut 93 is rotated to enable the nut 93 to be propped against the concrete member 12, and the prestress loss caused by the retraction of the clamping piece 91 and the slippage of the prestress beam is compensated.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

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

1. A one-time top-reversing support device for a low-retraction anchor, characterized in that it comprises: a limit plate (1), an outer cylinder (2), an inner cylinder (3), a bracket (4), a jack ( 5) and a tool anchor (6), the bracket (4) is a groove-shaped structure, and the bottom of the groove has a through hole (7), and the inner cylinder (3) is fixedly connected to the peripheral side of the through hole (7) ), the outer wall of the inner cylinder (3) is provided with threads, and the end of the inner cylinder (3) away from the bracket (4) is threadedly connected with the outer cylinder ( 2), the limit plate (1), the bracket (4), the jack (5) and the tool anchor (6) are sequentially sleeved on the steel strand (8), and the notch direction of the bracket (4) is Facing the limiting plate (1), the tool anchor (6) is detachably connected to the steel strand (8), and the jack (5) is used for tensioning the steel strand (8).

2. The one-time top-reversing support device for a low-retraction anchor according to claim 1, wherein the low-retraction anchor (9) is located at a slot one of the bracket (4) side, the low-retraction anchor (9) comprises a clip (91), an anchor plate (92) and a nut (93), the anchor plate (92) is a cylindrical structure with a tapered hole (10), The outer wall of the anchor plate (92) is provided with threads, the nut (93) is threadedly connected to the outer wall of the anchor plate (92), and the clip (91) is sleeved on the steel strand (8), The clip (91) is in contact with the limiting plate (1), and the outer cylinder (2) spirally approaches the limiting plate (1) on the inner cylinder (3) to make the limiting plate (1) close. The plate (1) presses the clip (91) into the tapered hole (10).

3 . The one-time top-reversing support device for a low-retraction anchor according to claim 2 , wherein the outer wall of the outer cylinder ( 2 ) is provided with a plurality of devices for rotating the outer cylinder. 4 . The blind holes (11) of (2), a plurality of the blind holes (11) are distributed on the outer wall of the outer cylinder (2) in an axial array.

4. The one-time top-reverse bearing device for a low-retraction anchor according to claim 2, wherein the anchor plate (92), the limit plate (1) and the inner cylinder (3) are The sum of the heights is less than the depth of the groove of the bracket (4), and the sum of the heights of the anchor plate (92), the limit plate (1), the inner cylinder (3) and the outer cylinder (2) is greater than that of the bracket (4) groove depth.

5. The one-time top-reverse bearing device for a low-retraction anchor according to claim 2, wherein the anchor plate (92), the limit plate (1) and the tool anchor (6) are all There are a plurality of piercing holes for piercing the steel strand (8), and the plurality of piercing holes of the three are distributed in an axis array.

6. The one-time top-reverse bearing device for a low-retraction anchor according to claim 5, characterized in that the diameter of the through hole on the limiting plate (1) is smaller than that of the clip (91). ) is the diameter of the end of one side close to the limit plate (1).