CN113373820A - Bridge prestress tension construction method - Google Patents
Bridge prestress tension construction method Download PDFInfo
- Publication number
- CN113373820A CN113373820A CN202110765046.2A CN202110765046A CN113373820A CN 113373820 A CN113373820 A CN 113373820A CN 202110765046 A CN202110765046 A CN 202110765046A CN 113373820 A CN113373820 A CN 113373820A
- Authority
- CN
- China
- Prior art keywords
- tensioning
- steel strand
- cylinder body
- tensioning cylinder
- cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- 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
Abstract
The invention provides a bridge prestress tensioning construction method, and belongs to the technical field of road and bridge construction. The method comprises the following steps: firstly, integrally tensioning the steel strand bundle, and stopping tensioning the whole steel strand bundle when the target pre-tightening force is slightly less than the target pre-tightening force; after the integral stretching is finished, stretching the steel strands one by one to enable all the steel strands to be consistent in pre-tightening force; and finally, integrally tensioning the whole bundle of steel strands to a target pre-tightening force again. The invention has the advantages of optimizing the stress condition of the steel strand, improving the bearing capacity of the member and the like.
Description
Technical Field
The invention belongs to the technical field of road and bridge construction, and relates to a bridge prestress tensioning construction method.
Background
The prestress tensioning is to apply prestress in advance in the bridge concrete member, so that the applied prestress tensioning member bears the compressive stress, and further generates a certain deformation to deal with the load applied to the beam-shaped member. Before the engineering structural member bears external load, the steel strand in the tension module is applied with pre-stress, so that the bending resistance and rigidity of the member can be improved, the occurrence time of cracks is delayed, and the durability of the member is improved.
Because the prestress applying cable at the same position in the bridge concrete member is distributed by a plurality of steel strands in a bundle form, the steel strands in the bundle form are tensioned as a whole when the prestress tensioning construction is carried out, so that the method has the following defects: 1. the steel strands in a bundle are anchored in a non-return mode through the conical clamping piece plugs respectively, during tensioning, the relative sliding displacement of the steel strands and the conical clamping piece plugs cannot be completely equal, so that the pretightening force of each steel strand is inconsistent under the condition that the steel strands are stretched to the same length, the pretightening force is the pretightening force of the whole bundle of steel strands after measurement and tensioning are finished, and the conditions that the pretightening force of some steel strands is large and the pretightening force of some steel strands is small inevitably exist, so that the condition of breakage can be caused under partial conditions; 2. when the steel strand bundle exists in the bridge concrete member in a curve form, the condition that the pretightening force of each steel strand is inconsistent is more serious.
For the above reasons, the existing prestressed tensioning device (jack) and construction method cannot achieve the ideal effect, which is: the pretightening force of each steel strand is basically consistent, and the integral pretightening force of the bundle of steel strands reaches a set value, so that the problem of cable breakage can be reduced, and the aim of improving the strength of the bridge concrete member by stretching and pretightening the steel strands can be fulfilled to the greatest extent.
Disclosure of Invention
The invention aims to provide a bridge prestress tensioning construction method aiming at the problems in the prior art, and the technical problem to be solved by the invention is how to balance the pretightening force of each steel strand of a steel strand bundle.
The purpose of the invention can be realized by the following technical scheme: a bridge prestress tension construction method is characterized by comprising the following steps: firstly, integrally tensioning the steel strand bundle, and stopping tensioning the whole steel strand bundle when the target pre-tightening force is slightly less than the target pre-tightening force; after the integral stretching is finished, stretching the steel strands one by one to enable all the steel strands to be consistent in pre-tightening force; and finally, integrally tensioning the whole bundle of steel strands to a target pre-tightening force again.
Furthermore, the prestress tensioning construction equipment capable of quickly and efficiently completing the construction steps comprises a cylinder sleeve, a first tensioning cylinder body and a second tensioning cylinder body, the first tensioning cylinder body is positioned between the second tensioning cylinder body and the cylinder sleeve, a first hydraulic cavity is arranged between the cylinder sleeve and the first tensioning cylinder body, a second hydraulic cavity is arranged between the first tensioning cylinder body and the second tensioning cylinder body, a plurality of reeving units are arranged on the second tensioning cylinder body, the reeving unit comprises a steel strand guide sleeve, a balance piston fixed on the steel strand guide sleeve, a balance slide hole arranged on a cylinder body bottom plate of the second tensioning cylinder body and an anchor plate fixed on the second tensioning cylinder body, the cylinder body bottom plate and the anchoring plate of the second tensioning cylinder body are both provided with through holes for allowing the steel strand guide sleeves to pass through, the outer end of the steel strand guide sleeve is provided with a first conical clamping piece plug capable of fixing the steel strand penetrating through the steel strand guide sleeve in a one-way mode; a closed balance cavity is formed between the anchor plate and the cylinder body bottom plate of the second tensioning cylinder body, and each balance slide hole is communicated with the balance cavity; and the balance cavity, the first hydraulic cavity and the second hydraulic cavity are filled with hydraulic oil.
Furthermore, the end part of the cylinder sleeve is provided with a mounting opening, the mounting opening is provided with an embedded anchor, the embedded anchor is provided with anchor line holes corresponding to the steel strands one to one, and second tapered clamping piece plugs are arranged in the anchor line holes.
Furthermore, a breathing hole communicated with one side of the balance sliding hole far away from the balance cavity is formed in the cylinder body bottom plate of the second tensioning cylinder body.
Furthermore, a first liquid connecting pipe communicated with the first hydraulic cavity is arranged on the cylinder sleeve.
Furthermore, a second liquid connecting pipe communicated with the second hydraulic cavity is arranged on the first tensioning cylinder body.
Furthermore, the cylinder sleeve and the first tensioning cylinder body are sealed through a first sealing seat, the first sealing seat is fixed on the cylinder sleeve, and the first sealing seat is connected to the first tensioning cylinder body in a sliding mode.
Furthermore, the first tensioning cylinder body and the second tensioning cylinder body are sealed through a second sealing seat, the second sealing seat is fixed on the first tensioning cylinder body, and the second sealing seat is connected to the second tensioning cylinder body in a sliding mode.
After the prestress tensioning construction equipment is utilized, the bridge prestress tensioning construction method can be refined as follows: A. installing the steel strands one by one, and enabling the steel strands to be non-return by utilizing the pre-buried anchorage devices and the steel strand guide sleeves respectively; B. enabling the first tensioning cylinder body and the second tensioning cylinder body to synchronously move backwards relative to the cylinder sleeve in a mode of pumping away hydraulic oil in the first hydraulic cavity, integrally tensioning the steel strand bundle, and maintaining the relative position of the first tensioning cylinder body and the cylinder sleeve unchanged when the tensioning force is close to a set value; C. the second tensioning cylinder body moves backwards relative to the first tensioning cylinder body in a mode of pumping away hydraulic oil in the second hydraulic cavity, and the pre-tightening force of each steel strand is balanced; D. the first tensioning cylinder body and the opposite cylinder sleeve move backwards again in a mode of pumping away the hydraulic oil in the first hydraulic cavity, and the steel strand bundle is integrally tensioned until the pretightening force reaches a set value; E. the steel strand and the second tensioning cylinder body are loosened in a mode of pulling out the first conical clamping piece plug, then the cylinder sleeve, the first tensioning cylinder body and the second tensioning cylinder body are separated from the steel strand, the steel strand is anchored on the pre-buried anchorage by the second conical clamping piece plug driven by the retraction force of the steel strand, and construction is completed.
When the steel strand bundle is integrally tensioned, the bottom of the second tensioning cylinder body is abutted against the bottom of the first tensioning cylinder body, so that the first tensioning cylinder body and the second tensioning cylinder body can synchronously move backwards relative to the cylinder sleeve; what this application indicates carries out the stretch-draw to steel strand wires one by one, through the incompressible principle of liquid promptly, realizes that each steel strand wires pretightning force is even when moving after the relative first cylinder body that draws of second stretch-draw cylinder body, specifically: when the second tensioning cylinder body moves backwards relative to the first tensioning cylinder body, the inner section of the steel strand guide sleeve is gradually separated from the bottom plate of the first tensioning cylinder body, a space for the steel strand guide sleeve to carry the steel strand to retract is vacated, at the moment, the balance piston connected with the steel strand with the larger pretightening force is difficult to pull and generates displacement relative to the second tensioning cylinder body, namely the balance piston connected with the steel strand with the larger pretightening force moves towards the retraction direction of the steel strand relative to the second tensioning cylinder body, and the balance cavity cannot be compressed due to hydraulic oil, so that the balance piston connected with the steel strand with the smaller pretightening force moves towards the tail end direction of the steel strand relative to the second tensioning cylinder body, namely the steel strand with the smaller pretightening force is tensioned, and all the pretightening forces of the steel strands tend to be balanced in the process of the backward movement of the second tensioning cylinder body.
As the pretightening force of each steel strand in the bundle is more average compared with the traditional mode, the stress of the steel strand bundle is more ideal, the steel strands are not easy to break, and the bearing capacity of the bridge concrete member is stronger.
It is easy to ask: how is the first tensioning cylinder body driven rearward, rather than directly driving the second tensioning cylinder body rearward? The sealing performance of the second tensioning cylinder body is relatively poor, and the steel strand is directly pulled backwards through the second tensioning cylinder body, so that the required time is long, the expansion of a balance cavity is easy to cause, and the moving stroke of the second tensioning cylinder body is short, so that the second tensioning cylinder body cannot be directly used for tensioning the steel strand; the second tensioning cylinder body can adjust the pre-tightening force of each steel strand only when the pre-tightening force of the steel strands is close to a set value, the adjustment can be completed in a very short time, and the displacement is small; before use, the hydraulic oil in the balance cavity needs to be adjusted, so that the balance piston is positioned in the middle of the balance slide hole in an unused state.
The first tapered clip plug and the second tapered clip plug for backstop fixing of the steel strand by the retraction force are conventional in the art and are not described in detail herein. The pre-tightening force mentioned in this application is case-specific and is not specified here.
Drawings
Fig. 1 is a schematic structural view of the prestress tension construction equipment in an unused state.
Fig. 2 is a schematic structural diagram of the prestress tension construction equipment when the steel strand bundle is integrally tensioned.
Fig. 3 is a schematic structural diagram of the pre-stressed tension construction equipment when pre-stressed forces of the steel strands are balanced.
In the figure, 1, cylinder sleeve; 2. a first tensioning cylinder; 3. a second tensioning cylinder; 41. a first hydraulic chamber; 42. a second hydraulic chamber; 51. a steel strand guide sleeve; 52. a balance piston; 53. a balance slide hole; 54. an anchor sheet; 55. a first tapered clip plug; 56. a balancing chamber; 57. pre-burying an anchorage device; 58. a second tapered blade plug; 59. a breathing hole; 61. a first liquid connection pipe; 62. a second liquid connection pipe; 71. a first seal seat; 72. and a second seal seat.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
The bridge prestress tension construction method comprises the following steps: firstly, integrally tensioning the steel strand bundle, and stopping tensioning the whole steel strand bundle when the target pre-tightening force is slightly less than the target pre-tightening force; after the integral stretching is finished, stretching the steel strands one by one to enable all the steel strands to be consistent in pre-tightening force; and finally, integrally tensioning the whole bundle of steel strands to a target pre-tightening force again.
As shown in fig. 1, the pre-stress tensioning construction equipment capable of rapidly and efficiently completing the above construction steps includes a cylinder sleeve 1, a first tensioning cylinder 2 and a second tensioning cylinder 3, the first tensioning cylinder 2 is located between the second tensioning cylinder 3 and the cylinder sleeve 1, a first hydraulic chamber 41 is provided between the cylinder sleeve 1 and the first tensioning cylinder 2, a second hydraulic chamber 42 is provided between the first tensioning cylinder 2 and the second tensioning cylinder 3, the second tensioning cylinder 3 has a plurality of cable-passing units, each cable-passing unit includes a steel strand guide sleeve 51, a balance piston 52 fixed on the steel strand guide sleeve 51, a balance slide hole 53 opened on a cylinder bottom plate of the second tensioning cylinder 3 and an anchor plate 54 fixed on the second tensioning cylinder 3, the cylinder bottom plate and the anchor plate 54 of the second cylinder 3 both have through holes allowing the steel strand guide sleeve 51 to pass through, the outer end of the steel strand guide sleeve 51 is provided with a first tapered hole capable of unidirectionally fixing the steel strand passing through the steel strand guide sleeve 51 A clip plug 55; a closed balance cavity 56 is formed between the anchor plate 54 and the cylinder body bottom plate of the second tensioning cylinder body 3, and each balance slide hole 53 is communicated with the balance cavity 56; the balance chamber 56, the first hydraulic pressure chamber 41, and the second hydraulic pressure chamber 42 are all filled with hydraulic oil.
The end part of the cylinder sleeve 1 is provided with a mounting opening, the mounting opening is provided with a pre-embedded anchorage device 57, the pre-embedded anchorage device 57 is provided with an anchor line hole which is in one-to-one correspondence with each steel strand, and a second cone-shaped clamping piece plug 58 is arranged in the anchor line hole.
The cylinder body bottom plate of the second tensioning cylinder body 3 is provided with a breathing hole 59 communicated with one side of the balance slide hole 53 far away from the balance cavity 56.
The cylinder sleeve 1 is provided with a first liquid connecting pipe 61 communicated with the first hydraulic cavity 41.
The first tensioning cylinder body 2 is provided with a second communication pipe 62 communicating with the second hydraulic chamber 42.
The cylinder sleeve 1 and the first tensioning cylinder body 2 are sealed through a first sealing seat 71, the first sealing seat 71 is fixed on the cylinder sleeve 1, and the first sealing seat 71 is connected to the first tensioning cylinder body 2 in a sliding mode.
The first tensioning cylinder body 2 and the second tensioning cylinder body 3 are sealed through a second sealing seat 72, the second sealing seat is fixed on the first tensioning cylinder body 2, and the second sealing seat 72 is connected to the second tensioning cylinder body 3 in a sliding mode.
After the prestress tensioning construction equipment is utilized, the bridge prestress tensioning construction method can be refined as follows: A. installing the steel strands one by one, and enabling the steel strands to be subjected to non-return by utilizing the pre-embedded anchorage device 57 and the steel strand guide sleeve 51 respectively; B. the first tensioning cylinder body 2 and the second tensioning cylinder body 3 synchronously move backwards relative to the cylinder sleeve 1 in a mode of pumping away hydraulic oil in the first hydraulic cavity 41, the steel strand bundle is integrally tensioned, and when the tensioning force is close to a set value, the relative position of the first tensioning cylinder body 2 and the cylinder sleeve 1 is kept unchanged, as shown in fig. 2; C. the second tensioning cylinder 3 moves backwards relative to the first tensioning cylinder 2 in a manner of pumping away the hydraulic oil in the second hydraulic cavity 42, so as to balance the pre-tightening force of each steel strand, as shown in fig. 3; D. the first tensioning cylinder body 2 and the opposite cylinder sleeve 1 are moved backwards again in a mode of pumping away the hydraulic oil in the first hydraulic cavity 41, and the steel strand bundle is integrally tensioned until the pretightening force reaches a set value; E. the steel strand and the second tensioning cylinder body 3 are loosened in a mode of pulling the first conical clamping piece plug 55 outwards, then the cylinder sleeve 1, the first tensioning cylinder body 2 and the second tensioning cylinder body 3 are separated from the steel strand, the steel strand is anchored on the embedded anchorage device 57 by the second conical clamping piece plug 58 driven by the retraction force of the steel strand, and construction is completed.
When the steel strand bundle is integrally tensioned, the bottom of the second tensioning cylinder body 3 is abutted against the bottom of the first tensioning cylinder body 2, so that the first tensioning cylinder body 2 and the second tensioning cylinder body 3 can synchronously move backwards relative to the cylinder sleeve 1; what this application indicated carries out the stretch-draw to the steel strand wires one by one, through the incompressible principle of liquid promptly, realizes that each steel strand wires pretightning force is even when moving behind the relative first stretch-draw cylinder body 2 of second stretch-draw cylinder body 3, specifically: when the second tensioning cylinder body 3 moves backwards relative to the first tensioning cylinder body 2, the inner section of the steel strand guide sleeve 51 gradually separates from the bottom plate of the first tensioning cylinder body 2, a space for the steel strand guide sleeve 51 to carry the steel strand to retract is vacated, at this time, the balance piston 52 connected with the steel strand with a large pretightening force generates displacement relative to the second tensioning cylinder body 3 because the balance piston is difficult to pull, namely, the balance piston 52 connected with the steel strand with a large pretightening force moves towards the retraction direction of the steel strand relative to the second tensioning cylinder body 3, and the balance cavity 56 causes the balance piston 52 connected with the steel strand with a small pretightening force to move towards the tail end direction of the steel strand relative to the second tensioning cylinder body 3 because hydraulic oil is incompressible, namely, the steel strand with a small pretightening force is tensioned, and the pretightening forces of all the steel strands tend to be balanced in the process of the second tensioning cylinder body 3 moving backwards.
As the pretightening force of each steel strand in the bundle is more average compared with the traditional mode, the stress of the steel strand bundle is more ideal, the steel strands are not easy to break, and the bearing capacity of the bridge concrete member is stronger.
It is easy to ask: how is the first tensioning cylinder 2 driven backwards first, rather than directly driving the second tensioning cylinder 3 backwards? The reason is that the sealing performance of the second tensioning cylinder 3 is relatively poor, and the steel strand is directly pulled backwards through the second tensioning cylinder 3, so that not only is the required time longer and the expansion of the balance cavity 56 easily caused, but also the moving stroke of the second tensioning cylinder 3 is shorter and the second tensioning cylinder cannot be directly used for tensioning the steel strand; the second tensioning cylinder 3 can adjust the pre-tightening force of each steel strand only when the pre-tightening force of the steel strands is close to a set value, the adjustment can be completed in a very short time, and the displacement is small; before use, the hydraulic oil in the balance chamber 56 is adjusted so that the balance piston 52 is located at the middle of the balance slide hole 53 in the unused state.
The first and second tapered clip plugs 55, 58 for backstopping the steel strands by the retraction force are conventional in the art and will not be described further.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (9)
1. A bridge prestress tension construction method is characterized by comprising the following steps: firstly, integrally tensioning the steel strand bundle, and stopping tensioning the whole steel strand bundle when the target pre-tightening force is slightly less than the target pre-tightening force; after the integral stretching is finished, stretching the steel strands one by one to enable all the steel strands to be consistent in pre-tightening force; and finally, integrally tensioning the whole bundle of steel strands to a target pre-tightening force again.
2. The prestressed tensioning construction method of the bridge according to claim 1, wherein the prestressed tensioning construction equipment comprises a cylinder sleeve (1), a first tensioning cylinder (2) and a second tensioning cylinder (3), the first tensioning cylinder (2) is located between the second tensioning cylinder (3) and the cylinder sleeve (1), a first hydraulic chamber (41) is arranged between the cylinder sleeve (1) and the first tensioning cylinder (2), a second hydraulic chamber (42) is arranged between the first tensioning cylinder (2) and the second tensioning cylinder (3), a plurality of cable-passing units are arranged on the second tensioning cylinder (3), the cable-passing units comprise a steel strand guide sleeve (51), a balance piston (52) fixed on the steel strand guide sleeve (51), a balance slide hole (53) arranged on a cylinder bottom plate of the second tensioning cylinder (3) and an anchor plate (54) fixed on the second tensioning cylinder (3), the cylinder body bottom plate and the anchor plate (54) of the second tensioning cylinder body (3) are provided with through holes allowing the steel strand guide sleeve (51) to pass through, and the outer end of the steel strand guide sleeve (51) is provided with a first conical clamping piece plug (55) capable of fixing the steel strand passing through the steel strand guide sleeve (51) in a one-way mode; a closed balance cavity (56) is formed between the anchor plate (54) and the cylinder body bottom plate of the second tensioning cylinder body (3), and each balance sliding hole (53) is communicated with the balance cavity (56); and hydraulic oil is filled in the balance cavity (56), the first hydraulic cavity (41) and the second hydraulic cavity (42).
3. The bridge prestress tensioning construction method according to claim 2, wherein an installation opening is formed in the end portion of the cylinder sleeve (1), an embedded anchor (57) is arranged at the installation opening, anchor line holes corresponding to the steel strands in a one-to-one mode are formed in the embedded anchor (57), and second tapered blade plugs (58) are arranged in the anchor line holes.
4. The prestressed tension construction method of a bridge according to claim 2, wherein the cylinder bottom plate of the second tension cylinder (3) is provided with a breathing hole (59) communicated with one side of the balance slide hole (53) far away from the balance cavity (56).
5. The bridge prestress tensioning construction method according to claim 2, wherein a first liquid connecting pipe (61) communicated with the first hydraulic cavity (41) is arranged on the cylinder sleeve (1).
6. The prestressed tension construction method of a bridge according to claim 2, wherein the first tension cylinder (2) is provided with a second communication pipe (62) communicated with the second hydraulic chamber (42).
7. The bridge prestress tensioning construction method according to claim 2, characterized in that the cylinder sleeve (1) and the first tensioning cylinder body (2) are sealed through a first sealing seat (71), the first sealing seat (71) is fixed on the cylinder sleeve (1), and the first sealing seat (71) is connected to the first tensioning cylinder body (2) in a sliding manner.
8. The prestressed tensioning construction method for the bridge according to claim 2, wherein the first tensioning cylinder (2) and the second tensioning cylinder (3) are sealed by a second sealing seat (72), the second sealing seat is fixed on the first tensioning cylinder (2), and the second sealing seat (72) is slidably connected to the second tensioning cylinder (3).
9. The bridge prestress tensioning construction method according to claim 2 or 3, or 4 or 5 or 6 or 7 or 8, characterized in that A, the steel strands are installed one by one, so that the steel strands are respectively subjected to non-return by utilizing the embedded anchors (57) and the steel strand guide sleeves (51); B. the first tensioning cylinder body (2) and the second tensioning cylinder body (3) synchronously move backwards relative to the cylinder sleeve (1) in a mode of pumping away hydraulic oil in the first hydraulic cavity (41), the steel strand bundle is integrally tensioned, and when the tensioning force is close to a set value, the relative position of the first tensioning cylinder body (2) and the cylinder sleeve (1) is kept unchanged; C. the second tensioning cylinder body (3) moves backwards relative to the first tensioning cylinder body (2) in a mode of pumping away hydraulic oil in the second hydraulic cavity (42), and the pre-tightening force of each steel strand is balanced; D. the first tensioning cylinder body (2) and the opposite cylinder sleeve (1) are moved backwards again in a mode of pumping away the hydraulic oil in the first hydraulic cavity (41), and the steel strand bundle is integrally tensioned until the pretightening force reaches a set value; E. the steel strand and the second tensioning cylinder body (3) are loosened in a mode of pulling out the first conical clamping plug (55), then the cylinder sleeve (1), the first tensioning cylinder body (2) and the second tensioning cylinder body (3) are separated from the steel strand, the steel strand is anchored on the embedded anchorage device (57) by the aid of the second conical clamping plug (58) driven by retraction force of the steel strand, and construction is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110765046.2A CN113373820A (en) | 2021-07-07 | 2021-07-07 | Bridge prestress tension construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110765046.2A CN113373820A (en) | 2021-07-07 | 2021-07-07 | Bridge prestress tension construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113373820A true CN113373820A (en) | 2021-09-10 |
Family
ID=77581234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110765046.2A Withdrawn CN113373820A (en) | 2021-07-07 | 2021-07-07 | Bridge prestress tension construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113373820A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117486114A (en) * | 2024-01-03 | 2024-02-02 | 河南丽卡数控设备有限公司 | Multi-hole front clamping jack |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2172761Y (en) * | 1993-07-23 | 1994-07-27 | 郝晋升 | Asynchronous traction device |
| JP2008231700A (en) * | 2007-03-16 | 2008-10-02 | Anderson Technology Kk | Flat anchorage device for post-tensioned type prestressed concrete floor slab, post-tensioned type prestressed concrete floor slab using the anchorage device, and construction method for the post-tensioned type prestressed concrete floor slab |
| CN106285013A (en) * | 2016-10-18 | 2017-01-04 | 柳州黔桥工程材料有限公司 | Steel strand wires group's anchor monoblock type automatic synchronization control method |
| CN106639329A (en) * | 2016-10-18 | 2017-05-10 | 柳州黔桥工程材料有限公司 | Steel-strand-group-anchoring-inhaul-cable-integrated automatic synchronous pre-tightening method |
| CN207418179U (en) * | 2017-08-23 | 2018-05-29 | 咸宁宏俊桥梁新技术开发应用有限公司 | A kind of preceding card punching bridge prestress stretch-draw jack |
| CN112726423A (en) * | 2021-02-01 | 2021-04-30 | 柳州市邱姆预应力机械有限公司 | Equal stress jack |
-
2021
- 2021-07-07 CN CN202110765046.2A patent/CN113373820A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2172761Y (en) * | 1993-07-23 | 1994-07-27 | 郝晋升 | Asynchronous traction device |
| JP2008231700A (en) * | 2007-03-16 | 2008-10-02 | Anderson Technology Kk | Flat anchorage device for post-tensioned type prestressed concrete floor slab, post-tensioned type prestressed concrete floor slab using the anchorage device, and construction method for the post-tensioned type prestressed concrete floor slab |
| CN106285013A (en) * | 2016-10-18 | 2017-01-04 | 柳州黔桥工程材料有限公司 | Steel strand wires group's anchor monoblock type automatic synchronization control method |
| CN106639329A (en) * | 2016-10-18 | 2017-05-10 | 柳州黔桥工程材料有限公司 | Steel-strand-group-anchoring-inhaul-cable-integrated automatic synchronous pre-tightening method |
| CN207418179U (en) * | 2017-08-23 | 2018-05-29 | 咸宁宏俊桥梁新技术开发应用有限公司 | A kind of preceding card punching bridge prestress stretch-draw jack |
| CN112726423A (en) * | 2021-02-01 | 2021-04-30 | 柳州市邱姆预应力机械有限公司 | Equal stress jack |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117486114A (en) * | 2024-01-03 | 2024-02-02 | 河南丽卡数控设备有限公司 | Multi-hole front clamping jack |
| CN117486114B (en) * | 2024-01-03 | 2024-03-05 | 河南丽卡数控设备有限公司 | Multi-hole front clamping jack |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2018072589A1 (en) | Automated and synchronized control system for bundled steel strand anchoring | |
| CN113373820A (en) | Bridge prestress tension construction method | |
| KR101213678B1 (en) | Apparatus for fixing the permanent ground anchor | |
| CN212376149U (en) | Connector for connecting unbonded prestressed steel strands in post-cast strip | |
| CN112726423B (en) | Equal stress jack | |
| CN110186648B (en) | Wave load self-propelled ship model test protection device and use method thereof | |
| CN113373821A (en) | Prestress tensioning equipment | |
| CN207828785U (en) | A kind of high stress steel strand wires extruding drag-line | |
| CN105952160A (en) | Prestressing double-cable synchronous tensioning tool | |
| CN106523448A (en) | Intelligent tensioning system used for pre-stress tendon constant-force uniform tensioning and method used for pre-stress tendon constant-force uniform tensioning | |
| WO2019119900A1 (en) | Low-tension anchor cable construction method capable of reducing prestress loss | |
| CN103643636A (en) | Rigid suspension rod pushing slippage device and slippage method thereof | |
| CN206360951U (en) | The uniform tensioning intelligent tensioning system of the power such as prestressing tendon | |
| CN2825587Y (en) | Integrated top-pressing jack | |
| CN107747279B (en) | Construction device and implementation method based on group anchor system single tensioning and cable adjusting | |
| CN103466501B (en) | A kind of prestressed stretch-draw jack | |
| CN203199934U (en) | Front-clamping type tensioning jack | |
| CN204940273U (en) | A kind of Prestressed anchor rope with pressure dispersing construction equipment | |
| KR101055175B1 (en) | Tensile cable retension structure and construction | |
| CN108146654B (en) | Load applying device for small unlocking actuator cylinder | |
| CN108716284A (en) | Anti-rebound steel strand wires strainer | |
| CN203486838U (en) | Prestress tension jack | |
| CN110700095A (en) | Stay cable anchoring traction device of large-span cable-stayed bridge and traction construction method thereof | |
| CN107964880B (en) | Prestressed carbon fiber stretching device | |
| CN113309361A (en) | Prestressed automatic tensioning anchoring equipment and tensioning method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210910 |
|
| WW01 | Invention patent application withdrawn after publication |