CN107419906B - Prestressed steel strand double-top anchor withdrawing device and method - Google Patents
Prestressed steel strand double-top anchor withdrawing device and method Download PDFInfo
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- CN107419906B CN107419906B CN201710873237.4A CN201710873237A CN107419906B CN 107419906 B CN107419906 B CN 107419906B CN 201710873237 A CN201710873237 A CN 201710873237A CN 107419906 B CN107419906 B CN 107419906B
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- steel strand
- prestressed steel
- anchor
- withdrawing
- jack
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G21/121—Construction of stressing jacks
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a prestressed steel strand double-jack anchor withdrawing device and a method, and the device comprises a prestressed component, an anchor withdrawing base, a tool anchor and a hollow jack, wherein the prestressed component is provided with a working anchor and a working chuck which are connected with a prestressed steel strand; the anchor withdrawing device is simple in structure, ingenious in design and convenient to operate, can effectively solve the problems of difficult operation, long construction period, difficulty in controlling construction operation risks and the like in the existing anchor withdrawing construction of the prestressed steel strands, and is particularly suitable for load removal of the prestressed steel strands.
Description
Technical Field
The invention relates to a prestressed steel strand double-top anchor withdrawing device and method, and belongs to the technical field of prestressed steel strand anchor withdrawing.
Background
In the traditional prestressed steel strand anchor withdrawing method, after a front clamping type jack is extended out for a certain length in advance, the prestressed steel strand anchor withdrawing is tensioned, a working clamping piece is withdrawn in an anchor withdrawing device, an oil pump is operated to enable an oil cylinder of the front clamping type jack to retract for the rest 2cm, the working clamping piece is installed again to anchor the prestressed steel strand, and the anchor withdrawing of the prestressed steel strand is completed through repeated operation. The traditional prestressed steel strand anchor withdrawal method is difficult to operate, long in construction period and difficult to control construction operation risks.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the device and the method for withdrawing the anchor from the double tops of the prestressed steel strands are provided, and the problems that the operation is difficult, the construction period is long, the construction operation risk is not easy to control and the like in the existing prestressed steel strand withdrawing construction are solved.
The technical scheme of the invention is as follows: the utility model provides a two tops of prestressing force steel strand wires move back anchor device, includes the prestressing force component, moves back anchor base, instrument ground tackle and hollow jack, is provided with work ground tackle and the work chuck of being connected with the prestressing force steel strand wires on the prestressing force component, it is tubulose to move back the anchor base, is provided with the work hand hole on its circumference wall, moves back the anchor pedestal mounting outside the one end of prestressing force component, and inside runs through the prestressing force steel strand wires that are located prestressing force component one end, and hollow jack is in the outer end outside of moving back the anchor base with moving back the coaxial mode setting of anchor base, is provided with the instrument ground tackle at the outer terminal surface of hydro-cylinder of hollow jack, and the prestressing force steel strand wires that are located outside the instrument ground tackle are connected with preceding calorie formula jack.
The anchor withdrawing base is in a conical tubular shape.
The number of the working hand holes on the anchor withdrawing base is 2, and the working hand holes are symmetrically arranged on the circumferential wall surface. The tool clamping piece can be repeatedly dismantled and anchored in the special anchor withdrawing base every time of double-top anchor withdrawing operation of the prestressed steel strand, so that the operation safety is ensured.
The invention also provides an anchor withdrawing method adopting the prestressed steel strand double-top anchor withdrawing device, which comprises the following steps of:
(1) Penetrating the anchor withdrawing base through the prestressed steel strand and installing the anchor withdrawing base on the outer end face of the prestressed component;
(2) Penetrating a hollow jack through the prestressed steel strand and installing the hollow jack on the outer side of the outer end of the anchor withdrawing base in a manner of being coaxial with the anchor withdrawing base, wherein an oil cylinder of the hollow jack has a set pre-stretching amount L;
(3) Installing a tool anchorage outside an oil cylinder of the hollow jack, and enabling the prestressed steel strand to penetrate through a hole in the tool anchorage;
(4) Installing a front clamping type jack on a prestressed steel strand needing load shedding, wherein the front clamping type jack is installed on the outer side of a tool anchorage;
(5) Tensioning the anchor-withdrawing prestressed steel strand by a front clamping type jack, stopping tensioning the prestressed steel strand when the working clamping piece is easy to remove, taking out the working clamping piece, returning oil to the hollow jack and jacking, retracting the oil cylinder of the hollow jack by M, then reinstalling the working clamping piece, re-anchoring the prestressed steel strand on the working anchorage device, retracting the oil cylinder of the hollow jack by N, anchoring the prestressed steel strand on the working anchorage device only by the working clamping piece, and then removing the tensioning force of the front clamping type jack on the prestressed steel strand, namely completing the primary unloading of the prestressed steel strand;
(6) And (5) repeating the step (5) until the load of the single prestressed steel strand is completely unloaded, namely completing the double-top anchor withdrawing operation of the single prestressed steel strand, and withdrawing the double-top anchors of the other prestressed steel strands according to the step of withdrawing the single prestressed steel strand.
In step (5), L = M + N, and M > N.
The invention has the beneficial effects that: compared with the prior art, the invention has the following advantages:
1. the clamping piece can be repeatedly operated and detached in the tubular anchor withdrawing base, the operation is simple and quick, and the construction efficiency is improved.
2. Because the hollow jack cylinder has the pre-stretching amount, the retraction amount of the single prestressed steel strand anchor withdrawing is increased, the frequency of anchor withdrawing operation is reduced, and the construction period is shortened.
3. The combination of the feed-through jack and the front clamping jack unloads the prestressed steel strand, effectively controls the construction risk and ensures the construction safety.
The anchor withdrawing device is simple in structure, ingenious in design and convenient to operate, can effectively solve the problems of difficult operation, long construction period, difficulty in controlling construction operation risks and the like in the existing anchor withdrawing construction of the prestressed steel strands, and is particularly suitable for load removal of the prestressed steel strands.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1. the working anchor device comprises a working anchor device, 2, a working clamping piece, 3, an anchor withdrawing base, 4, a hollow jack, 5, an oil cylinder, 6, a tool anchor device, 7, a front clamping type jack, 8 and a prestress member.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments:
referring to fig. 1, the prestressed steel strand double-top anchor withdrawing device in the embodiment of the invention comprises a prestressed member 8, an anchor withdrawing base 3, a tool anchor 6 and a hollow jack 4, wherein the prestressed member 8 is provided with a working anchor 1 and a working chuck connected with a prestressed steel strand, the prestressed member 8 is generally a beam concrete end, the anchor withdrawing base 3 is in a conical tube shape, 2 working hand holes are symmetrically arranged on the circumferential wall surface of the conical tube shape, the anchor withdrawing base 3 is installed outside one end of the prestressed steel strand 8, the inner part of the conical tube shape penetrates through the prestressed steel strand at one end of the prestressed steel strand 8, the hollow jack 4 is arranged outside the outer end of the anchor withdrawing base 3 in a manner coaxial with the anchor withdrawing base 3, the tool anchor 6 is arranged on the outer end surface of an oil cylinder 5 of the hollow jack 4, and the prestressed steel strand outside the tool anchor 6 is connected with a front clamping type jack 7.
The anchor withdrawing method adopting the prestressed steel strand double-top anchor withdrawing device comprises the following steps:
(1) The anchor withdrawing base 3 penetrates through the prestressed steel strand and is installed on the outer end face of the prestressed component 8;
(2) Penetrating a hollow jack 4 through the prestressed steel strand and installing the hollow jack 4 on the outer side of the outer end of the anchor withdrawing base 3 in a manner of being coaxial with the anchor withdrawing base 3, wherein an oil cylinder 5 of the hollow jack 4 has a set pre-extension amount (L) of 18 cm;
(3) A tool anchorage device 6 is arranged on the outer side of the oil cylinder 5 of the hollow jack 4, and the prestressed steel strand penetrates through a hole in the tool anchorage device 6;
(4) Installing a front clamping type jack 7 on a prestressed steel strand needing load shedding, wherein the front clamping type jack 7 is installed on the outer side of the tool anchorage device 6;
(5) Tensioning the anchor-withdrawing prestressed steel strand by the front clamping type jack 7, stopping tensioning the prestressed steel strand when the working clamping piece 2 is easy to remove, taking out the working clamping piece 2, returning oil to the hollow jack 4 for jacking, retracting (M) the oil cylinder 5 of the hollow jack 4 for 17cm, reinstalling the working clamping piece 2, re-anchoring the prestressed steel strand on the working anchorage device 1, retracting (N) the oil cylinder 5 of the hollow jack 4 for 1cm until the prestressed steel strand is anchored on the working anchorage device 1 only by the working clamping piece 2, and relieving the tensioning force of the front clamping type jack 7 on the prestressed steel strand, namely completing the primary unloading of the prestressed steel strand;
(6) And (5) repeating the step (5) until the load of the single prestressed steel strand is completely unloaded, namely completing the double-top anchor withdrawing operation of the single prestressed steel strand, and withdrawing the double-top anchors of the rest prestressed steel strands according to the step of withdrawing the single prestressed steel strand.
In the embodiment of the present invention, L = M + N, and M > N, where the pre-extension amount L means that the jack cylinder 5 is extended by a certain length in advance, and can be determined according to what kind of jack is actually to be removed.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (5)
1. The utility model provides a two tops of prestressing force steel strand wires move back anchor device, includes prestressing force component (8), moves back anchor base (3), instrument ground tackle (6) and hollow jack (4), is provided with work ground tackle (1) and the work chuck of being connected with prestressing force steel strand wires on prestressing force component (8), its characterized in that: move back anchor base (3) and be the tubulose, be provided with the work hand hole on its circumference wall, move back anchor base (3) and install in the one end of prestressing force component (8) outside, inside runs through the prestressing steel strand wires that are located prestressing force component (8) one end, hollow jack (4) are in the outer end outside of moving back anchor base (3) with moving back anchor base (3) coaxial mode setting, be provided with instrument ground tackle (6) at the hydro-cylinder (5) outer terminal surface of hollow jack (4), the prestressing steel strand wires that are located outside instrument ground tackle (6) are connected with preceding cassette jack (7).
2. The prestressed steel strand double-top anchor withdrawing device as recited in claim 1, wherein: the anchor withdrawing base (3) is in a conical tubular shape.
3. The prestressed steel strand double-top anchor withdrawing device as recited in claim 1, wherein: the number of the working hand holes on the anchor withdrawing base (3) is 2, and the working hand holes are symmetrically arranged on the circumferential wall surface.
4. An anchor withdrawing method adopting the prestressed steel strand double-top anchor withdrawing device as recited in any one of claims 1 to 3, characterized in that: the method comprises the following steps:
(1) Penetrating the anchor withdrawing base (3) through the prestressed steel strand and installing the anchor withdrawing base on the outer end face of the prestressed component (8);
(2) Penetrating the hollow jack (4) through the prestressed steel strand and installing the hollow jack on the outer side of the outer end of the anchor withdrawing base (3) in a manner of being coaxial with the anchor withdrawing base (3), wherein an oil cylinder (5) of the hollow jack (4) has a set pre-stretching amount L;
(3) A tool anchorage device (6) is arranged on the outer side of the oil cylinder (5) of the hollow jack (4), and the prestressed steel strand penetrates through a hole in the tool anchorage device (6);
(4) Mounting a front clamping type jack (7) on a prestressed steel strand needing load shedding, wherein the front clamping type jack (7) is mounted on the outer side of the tool anchorage device (6);
(5) The anchor-withdrawing prestressed steel strand is tensioned through the front clamping type jack (7), when the working clamping piece (2) is easy to disassemble, the tensioning of the prestressed steel strand is stopped, the working clamping piece (2) is taken out, the hollow jack (4) is subjected to oil return and jacking, the working clamping piece (2) is reinstalled after the oil cylinder (5) of the hollow jack (4) retracts M, the prestressed steel strand is reinchored on the working anchorage device (1), the oil cylinder (5) of the hollow jack (4) retracts N until the prestressed steel strand is anchored on the working anchorage device (1) only by the working clamping piece (2), and the tensioning force of the prestressed steel strand is relieved by the front clamping type jack, so that one-time unloading of the prestressed steel strand is completed;
(6) And (5) repeating the step (5) until the load of the single prestressed steel strand is completely unloaded, namely completing the double-top anchor withdrawing operation of the single prestressed steel strand, and withdrawing the double-top anchors of the other prestressed steel strands according to the step of withdrawing the single prestressed steel strand.
5. The anchor withdrawing method of the prestressed steel strand double-top anchor withdrawing device as recited in claim 4, wherein: in step (5), L = M + N, and M > N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710873237.4A CN107419906B (en) | 2017-09-25 | 2017-09-25 | Prestressed steel strand double-top anchor withdrawing device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710873237.4A CN107419906B (en) | 2017-09-25 | 2017-09-25 | Prestressed steel strand double-top anchor withdrawing device and method |
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| Publication Number | Publication Date |
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| CN107419906A CN107419906A (en) | 2017-12-01 |
| CN107419906B true CN107419906B (en) | 2023-03-14 |
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| CN201710873237.4A Active CN107419906B (en) | 2017-09-25 | 2017-09-25 | Prestressed steel strand double-top anchor withdrawing device and method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108584762B (en) * | 2018-07-05 | 2023-05-23 | 上海市机械施工集团有限公司 | Tool anchor device capable of being used for replacing penetrating jack in use |
| CN111827685A (en) * | 2020-06-23 | 2020-10-27 | 中国五冶集团有限公司 | Tool clamping piece anchor withdrawing device and anchor withdrawing method |
| CN112556907B (en) * | 2020-11-25 | 2021-09-28 | 宁波大学 | Beam-end prestress loading fixing device and unloading method thereof |
| CN113187245B (en) * | 2021-04-29 | 2022-07-15 | 中建桥梁有限公司 | Clamping piece shifting device for prestress releasing construction and shifting method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031873B (en) * | 2010-10-29 | 2012-05-09 | 天地科技股份有限公司 | Hydraulic tensioner of fixed-torque locking prestressed anchor |
| CN102704691B (en) * | 2012-06-05 | 2014-10-29 | 中铁六局集团有限公司 | Whole-bundle disanchoring device and disanchoring method adopting same |
| CN104631835A (en) * | 2013-11-15 | 2015-05-20 | 五冶集团上海有限公司 | Prestressed beam and slab stretching-drawing group-bundle steel strand anchor receding device and application thereof |
| CN207348475U (en) * | 2017-09-25 | 2018-05-11 | 中铁五局集团有限公司 | A kind of prestress wire Double Tops move back anchor device |
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| CN107419906A (en) | 2017-12-01 |
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