CN201217778Y

CN201217778Y - Low-retraction secondary stretching pre-stress anchorage

Info

Publication number: CN201217778Y
Application number: CNU2008200536254U
Authority: CN
Inventors: 万国强; 邵旭东
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-07-07
Filing date: 2008-07-07
Publication date: 2009-04-08
Anticipated expiration: 2018-07-07

Abstract

The utility model relates to a low retraction secondary tensioning prestressed anchor which belongs to a tensioning prestressed anchor that mainly solves the technical problems of high retraction loss, and the like of the prior bridge vertical prestressed anchor. The low retraction secondary tensioning prestressed anchor comprises a liner plate, a supporting nut, a barrel and a clamping piece, wherein the barrel is designed to be an up and down step column structure, an up step column body is connected with a down step column body into an integer, the peripheries of the up step column body and the down step column body are provided with threads, the outside diameter of the upper column body is more than that of the lower column body, the threads arranged at the periphery of the lower column body are matched with internal threads of the supporting nut, the barrel is provided with 1-20 axial taper holes and is arranged at the upper part of the liner plate, and the outside diameter of the barrel is more than the inside diameter of the center of the liner plate. After the secondary tensioning, the connection between gaps is supported by the supporting nut. The low retraction secondary tensioning prestressed anchor can compensate the prestressing loss generated by the retraction of firstly tensioning and releasing the anchor through the secondary tensioning construction, causes the size of the top circle structure of the anchor, and can be widely applied to the construction of light bridge prestressed structures.

Description

Low retraction two times tensioning prestressed anchor

Technical field

The utility model relates to a kind of stretch-draw prestressing force ground tackle, particularly a kind of energy many prestress wires of anchoring and high-strength steel tow two times tensioning ground tackle.

Background technology

At present, actual engineering design, in the construction loss of prestress of short-and-medium bundle presstressed reinforcing steel ubiquity big, steel utilization ratio is low.Particularly the loss of bridge vertical prestressing ground tackle retraction is up to 20%-40%, in recent years research and develop successful two times tensioning prestressed anchor, effectively solve the excessive problem of loss of prestress, but two times tensioning prestressed anchor structure chi is relatively large, be applied in the high-strength concrete that to reserve the stretching notch size also big, cause in the vertical prestressing ground tackle that physical dimension is had requirement, to promote the use of to be subjected to certain restriction.

Summary of the invention

The purpose of this utility model provides the low retraction two times tensioning prestressed anchor that a kind of contour structure size is less, efficient is higher.

The technical scheme that its technical problem that solves the utility model adopts is: it is made up of backing plate 1, back nut 2, anchor cup 3, intermediate plate 4, anchor cup 3 is designed to up/down steps formula cylindrical shape structure, up/down steps formula cylinder connects to one, cylindrical up and down periphery is provided with screw thread, last cylinder external diameter is greater than following cylinder external diameter, the screw thread of following cylinder periphery setting matches with the internal thread of back nut 2, anchor cup 3 is provided with 1～20 axial taper hole, anchor cup 3 is installed in backing plate 1 top, and the external diameter of anchor cup 3 is greater than the internal diameter of backing plate 1 central authorities.The last cylinder external diameter of described anchor cup 3 is greater than following cylinder external diameter 0.5～35mm, and last cylinder length is 15～60mm, and following cylinder length is 15～40mm.

Back nut 2 cylindricals of the present utility model can be designed to the face of cylinder, and can along the circumferential direction open 2～10 notches on the face of cylinder of back nut 2 cylindricals, and this notch is a groove by anchor cup 3 ends, and the other end is blind mouthful.

The utility model is after implementing two times tensioning, and the gap between 3 times cylinder end faces of anchor cup and backing plate 1 big end surface can be designed between 3～15mm, and the connection between the gap is born by back nut 2.

The beneficial effects of the utility model are: remedy stretch-draw for the first time by the two times tensioning construction and put a loss of prestress that the ground tackle retraction produces, improve ground tackle efficient, simultaneously, ground tackle cylindrical physical dimension obviously reduces, and satisfies the requirement that the mounting structure size is had the lightness bridge prestress structure of requirement.It is wider to make it applicable surface, produces bigger economic benefit and social benefit.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the two times tensioning scheme of installation.

Among the figure: the 1-backing plate; The 2-back nut; 3-anchor cup; The 4-intermediate plate; The 5-steel strand; The 6-bellows; The 7-spiral bar, 8-concrete, 9-adapter sleeve, 10-stretch-draw bearing, 11-jack, 12-attaching nut, 13-tension rod.

The specific embodiment

That the utility model is described in further detail is as follows below in conjunction with embodiment:

Embodiment 1, the utility model is made up of backing plate 1, back nut 2, anchor cup 3, intermediate plate 4, it is characterized in that: anchor cup 3 is designed to step cylindrical shape structure, the step cylinder connects to one, the cylinder periphery is a helicitic texture, last cylinder external diameter is greater than following cylinder external diameter 0.5～35mm, last cylinder length is designed to 15～60mm, following cylinder length is designed to 15～40mm, following cylinder external screw thread is connected with back nut 2 internal threads, anchor cup 3 step cylinder axis are to leaving 1～20 taper hole, and taper hole and intermediate plate 4 outer cones are complementary.Back nut 2 thickness can be designed to 15～60mm, and endoporus is a screw thread, and 3 times cylinder external screw threads of one end and anchor cup are connected, and other end end face is installed on backing plate 1 big end surface; Back nut 2 cylindricals can be designed to the face of cylinder, and can open 2～10 notches at its circumferencial direction, this notch is a groove by anchor cup 3 ends, the other end is blind mouthful, after low retraction two times tensioning prestressed anchor is implemented two times tensioning, final duty is shown in Figure 1, and the gap between 3 times cylinder end faces of anchor cup and backing plate 1 big end surface is between 3～15mm, and the connection between the gap is born by back nut 2.

Specific design can adopt following specification: back nut 2 external diameter φ 120mm, internal diameter M93 * 3, thickness 29mm; 4 taper holes are axially established in height 28mm, following cylinder external diameter M93 * 3, height 30mm, the step cylinder in cylinder external diameter M108 * 3 on the anchor cup 3, and size is consistent with common ground tackle; Backing plate 1, intermediate plate 4 and conventional ground tackle are measure-alike or close.Stretch-draw for the first time is stretch-draw construction method routinely, and after stretching construction was put for the first time, back nut 2 did not stress, and the gap between anchor cup 3 end faces and backing plate 1 end face is 0.The prestressing force bang path is: steel strand 5 → intermediate plate 4 → anchor cup 3 → backing plate 1 → mixed earth 8.Stretching construction carries out the stretching construction second time after 2～72 hours for the first time, press Fig. 2 mounting method, with anchor cup 3, back nut 2, intermediate plate 4, steel strand 5 whole pull-ups to design load, anchor cup 3 leaves backing plate 1 plane 3～15mm with back nut 2, held lotus 2 minutes, to the tight compensate for clearance of backing plate 1 sidespin, jack is put and is opened with back nut 2, finishes the two times tensioning construction.The prestressing force bang path is: steel strand 5 → intermediate plate 4 → anchor cup 3 → back nut 2 → backing plate 1 → mixed earth 8.Consult Fig. 1 to Fig. 2.

Embodiment 2, back nut 2 cylindricals of the present utility model can be arranged to the face of cylinder, and along the circumferential direction open 2～10 notches on the face of cylinder of back nut (2) cylindrical, and this notch is groove by anchor cup (3) end, the other end is blind mouthful, and it mainly is swivel nut to be installed for convenience use.Consult Fig. 1 to Fig. 2, all the other are with embodiment 1.

Claims

1, a kind of low retraction two times tensioning prestressed anchor, by backing plate (1), back nut (2), anchor cup (3), intermediate plate (4) is formed, it is characterized in that: anchor cup (3) is designed to up/down steps formula cylindrical shape structure, up/down steps formula cylinder connects to one, cylindrical up and down periphery is provided with screw thread, last cylinder external diameter is greater than following cylinder external diameter, the screw thread that following cylinder periphery is provided with matches with the internal thread of back nut (2), anchor cup (3) is provided with 1～20 axial taper hole, anchor cup (3) is installed in backing plate (1) top, and the external diameter of anchor cup (3) is greater than the internal diameter of backing plate (1) central authorities.

2, low retraction two times tensioning prestressed anchor according to claim 1 is characterized in that: the last cylinder external diameter of described anchor cup (3) is greater than following cylinder external diameter 0.5～35mm, and last cylinder length is 15～60mm, and following cylinder length is 15～40mm.

3, low retraction two times tensioning prestressed anchor according to claim 1, it is characterized in that: back nut (2) cylindrical is the face of cylinder, and on the face of cylinder of back nut (2) cylindrical, along the circumferential direction open 2～10 notches, and this notch is groove by anchor cup (3) end, the other end is blind mouthful.

4, low retraction two times tensioning prestressed anchor according to claim 1, it is characterized in that: after implementing two times tensioning, gap under the anchor cup (3) between cylinder end face and backing plate (1) big end surface is between 3～15mm, and the connection between the gap is born by back nut (2).