CN112497479A - Pre-tensioning method precast beam slab synchronous tensioning and releasing system - Google Patents
Pre-tensioning method precast beam slab synchronous tensioning and releasing system Download PDFInfo
- Publication number
- CN112497479A CN112497479A CN202011112521.8A CN202011112521A CN112497479A CN 112497479 A CN112497479 A CN 112497479A CN 202011112521 A CN202011112521 A CN 202011112521A CN 112497479 A CN112497479 A CN 112497479A
- Authority
- CN
- China
- Prior art keywords
- tensioning
- jack
- releasing
- precast beam
- anchoring trolley
- 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.)
- Pending
Links
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title abstract description 29
- 238000004873 anchoring Methods 0.000 claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 238000005452 bending Methods 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 abstract description 13
- 238000010276 construction Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/043—Wire anchoring or tensioning means for the reinforcements
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The invention discloses a synchronous tensioning and releasing system for a pre-tensioning method precast beam slab, which comprises a first counterforce wall, a first anchoring trolley, a second counterforce wall, steel strands and a plurality of bent-up devices, a first jack and a second jack are respectively arranged on the first counter-force wall and the second counter-force wall, the first jack and the second jack are oppositely arranged and are respectively connected with the first anchoring trolley and the second anchoring trolley through a tensioning pull rod, two first steering frames are arranged between the first anchoring trolley and the second anchoring trolley, the turners are arranged between the two first steering frames at intervals, one end of the steel strand is anchored on the first anchoring trolley, and the other end of the steel strand penetrates through the first steering frame and the bending device and then is anchored on the second anchoring trolley. The system has the advantages of less processes, simple and convenient operation, stable structure and better popularization and application prospect.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a synchronous tensioning and releasing system for a pre-tensioning method precast beam slab.
Background
In the manufacturing method of the prestressed structure, the pretensioning method has the advantages of simple process, good durability, no stress concentration under the anchor and the like, and has incomparable superiority compared with the post-tensioning method; however, the pretensioning method still has the difficulties to be solved, such as the prestress tensioning mode, the control value of the initial tension of the broken line bundle, the reliability of the steel strand connector, the synchronism and the stability in the releasing and tensioning process, and the like.
The method is characterized in that only a small part of a prestress pretensioning method used in the prior engineering is suitable for tensioning a hollow slab linear bundle, is different from a pretensioning broken line method, has large difference, has different blanking lengths of a broken line bundle and a linear bundle, has different total lengths, does not use prestress values, but has the same stress values, and urgently needs to optimize the prior tensioning system in order to realize the synchronism and stability of tensioning and releasing processes and improve the process construction efficiency.
Disclosure of Invention
In order to solve the problems, the invention provides a synchronous tensioning and releasing system for pre-tensioning precast beam plates, which enables the tensioning of straight and broken line bundles of the pre-tensioning precast beam plates to realize good integrity, stability and high efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows: a pre-tensioning method precast beam slab synchronous tensioning and releasing system comprises a first reaction wall, a first anchoring trolley, a second reaction wall, a steel strand and a plurality of bending devices, wherein a first jack and a second jack are respectively installed on the first reaction wall and the second reaction wall, the first jack and the second jack are oppositely arranged, the first jack and the second jack are respectively connected with the first anchoring trolley and the second anchoring trolley through tensioning pull rods, two first steering frames are arranged between the first anchoring trolley and the second anchoring trolley, the bending devices are arranged between the two first steering frames at intervals, one end of the steel strand is anchored on the first anchoring trolley, and the other end of the steel strand penetrates through the first steering frames and the bending devices and then is anchored on the second anchoring trolley.
Furthermore, the first bogie is composed of a vertical frame and an inclined support, and a plurality of steering wheels are arranged on the vertical frame.
Furthermore, a second bogie is further arranged between the two first bogies and comprises two vertical frames which are arranged in parallel, an X-shaped support is formed between the two vertical frames, and a plurality of steering wheels are arranged on the two vertical frames.
Furthermore, the first reaction wall is connected with an inclined strut for reinforcement.
Furthermore, a reinforced steel pull belt is arranged on the second counter-force wall.
The invention has the beneficial effects that: the synchronous tensioning and releasing system for the pre-tensioning precast beam plate can effectively reduce the prestress friction loss and accurately control the tension value; the situations of incompact grouting and large friction loss of the tension channel can be avoided, and the quality of the beam slab is effectively ensured; the synchronous integral tensioning and releasing is realized, the working procedures are reduced, and the working efficiency can be effectively improved; the components arranged in the system have reusability, so that the cost can be saved; the system has the advantages of reduced procedures, simple and convenient operation, stable system and better popularization and application prospect.
Drawings
FIG. 1 is a front view of the structure of the present invention;
fig. 2-4 are enlarged partial views of the area labeled A, B, C in fig. 1, respectively.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1 to 4, a pre-tensioning precast beam slab synchronous tensioning and releasing system comprises a first reaction wall 2, a first anchoring trolley 5, two first bogies 6, a plurality of bending devices 7, a second bogie 8, a second anchoring trolley 11, a second reaction wall 9 and steel strands 13, the first counter-force wall 2 and the second counter-force wall 9 are respectively provided with a first jack 1 and a second jack 12, the first jack 1 and the second jack 12 are oppositely arranged, the first jack 1 and the second jack 12 are respectively connected with the first anchoring trolley 5 and the second anchoring trolley 11 through 4 tensioning pull rods 4, one end of the steel strand 13 is anchored on the first anchoring trolley 5 through a single-hole anchor, and the other end of the steel strand penetrates through the first bogie 6, the bending device 7, the second bogie 8, the bending device 7 and the second bogie 6 in sequence and then is anchored on the second anchoring trolley 11. The first jack 1 and the second jack 12 are provided with pressure sensors and pressure control units, and the pressure sensors can acquire data and the pressure control units can adjust the first jack 1 and the second jack 12.
Furthermore, for structural stability, the first reaction wall 2 is reinforced by connecting diagonal braces 3 or diagonal braces thereto. The second reaction walls are provided with steel drawstrings 10, the pre-tensioning method precast beam plate synchronous tensioning and releasing system can be sequentially and symmetrically arranged in actual construction, and the two second reaction walls can be reinforced through the steel drawstrings 10.
Further, the first jack 1 and the second jack 12 can adopt a 25T jack and a 400T smart jack as tensioning (releasing) equipment.
The reaction wall in the scheme can be a column structure besides a wall structure, wherein the reaction wall, the tensioning pull rod and the anchoring trolley are main components for realizing integral tensioning (releasing tension); the bending machine and the bogie are main components for realizing bending of the broken-line bundle steel strand.
In the specific construction process, the first anchoring trolley 5 and the second anchoring trolley 11 are anchored on the first reaction wall 2 and the second reaction wall 9 through 4 tensioning pull rods 4 respectively, and the equal and uniform stress of the 4 pull rods is ensured through accurate calculation. The control system controls the first jack 1 and the second jack 12 and monitors the tensioning degree of the steel strand 13; the control system can have the functions of displaying and storing data, and converts displacement control signals and pressure control signals of different stage conditions in the tensioning process into corresponding position servo units and pressure control units after processing the acquired demand data. The control system has the functions of synchronous tensioning (releasing), synchronous monitoring, over-tensioning early warning, quick releasing, elongation and tension force recording and the like. The position servo unit and the pressure control unit control the hydraulic actuating mechanism to act after reprocessing various received data, and control the pressure actuating mechanism to switch among different states according to signals continuously fed back by the pressure sensor in the tensioning process, so that the system can automatically control the whole tensioning process to accurately complete prestress tensioning according to the steps of a preset program, the prestress tensioning process can be automatically controlled, and the tension value and the elongation value can be automatically measured at the same time. In the synchronous tensioning process, the system automatically adjusts to the stage of designing the final stress value, the elongation of the 4 jacks at the single end is synchronous, and after the design final stress value is reached, the system automatically adjusts to ensure the synchronization of the force values of the 4 jacks at the single end.
Specifically, in the tensioning process, due to the fact that the elongation of the bent beam and the elongation of the straight beam are different, all the steel beams reach different designed initial stress values through a pre-tightening stage through accurate calculation, and the elongation and the final stress values of the bent beam and the straight beam are the same from the rest stage to the designed final stress value in the synchronous tensioning process. When the tension is over-tensioned, the tension system can automatically alarm; meanwhile, the tensioning equipment can automatically stop tensioning by setting an overstraining limit value, namely when the overstraining limit value is exceeded. And recording elongation data and a tension value of each stage in advance in an operation system of the tensioning equipment, controlling according to the deviation of the tension and the elongation less than or equal to + 6% during tensioning, and automatically alarming by the tensioning equipment when the deviation exceeds the range and stopping tensioning. The quick tension releasing control module arranged in the operation system of the tension equipment can realize quick tension releasing. In the integral tension releasing stage, the function of a system early warning module is utilized by the over-tension until the nut of the anchoring section begins to loosen, and the over-tension is controlled to be not more than 106% of the design force value all the time. Thereby ensuring the stable realization of synchronous tension and integral tension release. The optimization of the synchronous tensioning system for graded loading and load holding and load shedding can also meet the time requirements of single tensioning and releasing procedures in beam slab prefabrication, and the method has the characteristics of high efficiency, stability, good synchronism, accurate control, convenient operation and the like.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made in the claims and the description of the present invention are within the scope of the present invention.
Claims (6)
1. A synchronous tensioning and releasing system for a pre-tensioning precast beam slab is characterized by comprising a first counterforce wall, a first anchoring trolley, a second counterforce wall, steel strands and a plurality of bending devices, a first jack and a second jack are respectively arranged on the first counter-force wall and the second counter-force wall, the first jack and the second jack are oppositely arranged and are respectively connected with the first anchoring trolley and the second anchoring trolley through a tensioning pull rod, two first steering frames are arranged between the first anchoring trolley and the second anchoring trolley, the turners are arranged between the two first steering frames at intervals, one end of the steel strand is anchored on the first anchoring trolley, and the other end of the steel strand penetrates through the first steering frame and the bending device and then is anchored on the second anchoring trolley.
2. The system for synchronously tensioning and releasing precast beam slabs according to claim 1, wherein a second bogie is further arranged between the two first bogies.
3. The system for synchronously tensioning and releasing precast beam slabs according to claim 1, wherein the first bogie is composed of a vertical frame and an inclined support, and a plurality of steering wheels are arranged on the vertical frame.
4. The system for synchronously tensioning and releasing precast beam plates according to claim 1, wherein the first reaction wall is reinforced by diagonal support rods.
5. The system for synchronously tensioning and releasing precast beam slabs according to claim 2, wherein the second bogie comprises two vertical frames which are arranged in parallel, an X-shaped support is formed between the two vertical frames, and a plurality of steering wheels are arranged on the two vertical frames.
6. The system for synchronously tensioning and releasing the precast beam slab according to claim 1, wherein the second reaction wall is provided with a reinforced steel tension band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011112521.8A CN112497479A (en) | 2020-10-16 | 2020-10-16 | Pre-tensioning method precast beam slab synchronous tensioning and releasing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011112521.8A CN112497479A (en) | 2020-10-16 | 2020-10-16 | Pre-tensioning method precast beam slab synchronous tensioning and releasing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112497479A true CN112497479A (en) | 2021-03-16 |
Family
ID=74954155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011112521.8A Pending CN112497479A (en) | 2020-10-16 | 2020-10-16 | Pre-tensioning method precast beam slab synchronous tensioning and releasing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112497479A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704099A (en) * | 2022-03-23 | 2022-07-05 | 保利长大工程有限公司 | Pre-tensioning method precast beam tensioning concrete counterforce wall |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101158238A (en) * | 2007-11-21 | 2008-04-09 | 王用中 | Broken-line reinforcement prestressed concrete pre-tensioned girder construction process |
| CN101748681A (en) * | 2009-12-22 | 2010-06-23 | 浙江省大成建设集团有限公司 | Pretensioning method construction technology of 50m broken line reinforced concrete T-shaped beam |
| CN102785290A (en) * | 2011-05-19 | 2012-11-21 | 中铁二十三局集团轨道交通工程有限公司 | Core-penetrating pull-type pedestal for pre-tensioned pre-stressing U-shaped beam and construction method thereof |
| CN106013810A (en) * | 2016-05-26 | 2016-10-12 | 中铁二十三局集团轨道交通工程有限公司 | Pre-tensioning-method prestress tensioning construction method |
| JP2017014810A (en) * | 2015-07-01 | 2017-01-19 | 株式会社富士ピー・エス | Tensioning-force automatic-regulation type pre-tensioning device and pre-tensioning method |
| CN109676784A (en) * | 2019-01-23 | 2019-04-26 | 四川公路桥梁建设集团有限公司 | A kind of assembled steel-concrete combined structure pedestal and pre-tensioning system T beam construction |
-
2020
- 2020-10-16 CN CN202011112521.8A patent/CN112497479A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101158238A (en) * | 2007-11-21 | 2008-04-09 | 王用中 | Broken-line reinforcement prestressed concrete pre-tensioned girder construction process |
| CN101748681A (en) * | 2009-12-22 | 2010-06-23 | 浙江省大成建设集团有限公司 | Pretensioning method construction technology of 50m broken line reinforced concrete T-shaped beam |
| CN102785290A (en) * | 2011-05-19 | 2012-11-21 | 中铁二十三局集团轨道交通工程有限公司 | Core-penetrating pull-type pedestal for pre-tensioned pre-stressing U-shaped beam and construction method thereof |
| JP2017014810A (en) * | 2015-07-01 | 2017-01-19 | 株式会社富士ピー・エス | Tensioning-force automatic-regulation type pre-tensioning device and pre-tensioning method |
| CN106013810A (en) * | 2016-05-26 | 2016-10-12 | 中铁二十三局集团轨道交通工程有限公司 | Pre-tensioning-method prestress tensioning construction method |
| CN109676784A (en) * | 2019-01-23 | 2019-04-26 | 四川公路桥梁建设集团有限公司 | A kind of assembled steel-concrete combined structure pedestal and pre-tensioning system T beam construction |
Non-Patent Citations (1)
| Title |
|---|
| 熊锦鹏: ""折线先张法Bulb-T梁张拉台座设计与应用"", 《市政技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704099A (en) * | 2022-03-23 | 2022-07-05 | 保利长大工程有限公司 | Pre-tensioning method precast beam tensioning concrete counterforce wall |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113454306B (en) | Integral lifting construction method and device for arch structure | |
| CN109487709B (en) | One-side riding type temporary rope self-balancing pushing type suspension bridge sling replacement underpinning device | |
| CN109972493A (en) | A kind of self-anchored suspension bridge design and construction method of First cable later girder | |
| CN112227225A (en) | Catwalk sag adjusting device for erecting main cable based on suspension bridge air spinning method and construction method of catwalk sag adjusting device | |
| CN112497479A (en) | Pre-tensioning method precast beam slab synchronous tensioning and releasing system | |
| CN110205940A (en) | 0# block construction bracket and its reverse drawing preloading method | |
| CN111980418A (en) | Construction method for hoisting steel structure roof of beam string dome in large-scale public building engineering | |
| CN214271702U (en) | Catwalk sag adjusting device for erecting main cable based on suspension bridge air spinning method | |
| CN113789712B (en) | Longitudinal beam and arch rib forming control method of steel arch bridge | |
| CN109537476B (en) | Pin lug type double-temporary-rope self-balancing pulling type suspension bridge sling replacement underpinning device | |
| CN112942132B (en) | Front supporting point composite hanging basket and shifting method thereof | |
| CN111042542A (en) | Cumulative lifting method for large-span unequal-height bidirectional curved surface net rack | |
| CN214695184U (en) | Pre-pressing system for double-thin-wall pier beam support bracket | |
| CN101259940A (en) | Large tonnage backstay multi-cable wind-rope simultaneously pretightening or releasing system and method thereof | |
| CN110469140B (en) | Construction method for prestress reinforcement of frame beam | |
| CN110524675B (en) | Pre-tensioning prefabricated I-beam and construction method thereof | |
| CN214656451U (en) | Front supporting point composite hanging basket | |
| CN215714703U (en) | Anti-pre-compaction device that draws of box girder bracket steel strand wires that waters of hanging | |
| CN217006730U (en) | Anti bearing capacity test system that slides of cable and cable clamp built-up member buckle | |
| CN109083022B (en) | System and method for monitoring construction cable force uniformity of parallel steel strand stay cable | |
| CN214738789U (en) | Large-span welding ball net rack integral hydraulic lifting construction structure | |
| CN112195794A (en) | Construction process for gravity type anchorage of large-span suspension bridge by adopting loose cable sleeve | |
| CN212077660U (en) | Large-span wide width bridge girder rhombus hanging basket construction structure | |
| CN101200876A (en) | Erection of second hole large-span steel girder by rear anchorage cable method | |
| CN216132684U (en) | Steel sling bearing tension test device |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210316 |
|
| RJ01 | Rejection of invention patent application after publication |