CN1718970A - Intelligent prestress system - Google Patents
Intelligent prestress system Download PDFInfo
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- CN1718970A CN1718970A CN 200510028189 CN200510028189A CN1718970A CN 1718970 A CN1718970 A CN 1718970A CN 200510028189 CN200510028189 CN 200510028189 CN 200510028189 A CN200510028189 A CN 200510028189A CN 1718970 A CN1718970 A CN 1718970A
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- reinforcing steel
- presstressed reinforcing
- backing plate
- screw rod
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Abstract
The present invention discloses an intelligent prestress system. It includes anchor device and tendon. The described tendon is made up by using marmem through tension process under the low-temperature martensite condition, and two ends of the tendon are connected with adjustable DC power supply. Said invention also provides its working principle and application.
Description
Technical field
The present invention relates to technical field of civil engineering, be specifically related to a kind of pre-stress system that can Based Intelligent Control.
Background technology
Along with going deep into of civil engineering research, structural stress control is subjected to increasing attention.By controlling the stress state of important supporting member, can be controlled the stress and the distortion of total, change and sudden rough sledding to deal with the structure mode of occupation that may occur.Marmem (being called for short SMA) as a kind of important intelligent drives material, has self-sensing properties and shape memory effect.Utilize the self-sensing properties of SMA, can respond to the strain of self and even inside configuration.The shape memory effect of marmem is meant the ability that has the memory and return back to its shape under austenitic state.If stretching SMA and stay bigger plastic strain under the low-temperature martensite state, so SMA is heated to uniform temperature after, the shape that SMA will be returned to it when beginning.If impose restriction in the SMA Recovery Process, SMA will produce very big restoring force so.Utilize this restoring force can change the stressing conditions of important component, thereby control the stress and the distortion of total.
On the one hand existing common presstressed reinforcing steel and ground tackle can not be realized Based Intelligent Control to structure, on the other hand at present in the field of civil engineering research of relevant SMA intelligence structure both at home and abroad all also seldom, using still be blank.The research in past is embedded among the concrete component after only limiting to marmem stretched, and makes its contraction by current excitation, produces driving force adjustment structure internal force.These existing mode and devices become composite material together because marmem must be cast in structure, because two kinds of distortion of materials differences cause and can't carry out large deformation control to structure.And marmem and concrete binding deficiency, and do not have the device of ground tackle and so on to guarantee marmem and structure cooperative transformation, thus make restoring force be difficult to play a role fully.The heat that produces when encouraging simultaneously reduces concrete performance.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of intelligent prestress system, can be according to the stress and the distortion of actual conditions adjustment structure, and have high accuracy.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme: a kind of intelligent prestress system, comprise ground tackle and presstressed reinforcing steel, described presstressed reinforcing steel is stretched under the low-temperature martensite state by marmem and makes, and the two ends of presstressed reinforcing steel are connected with adjustable dc source.
The present invention utilizes marmem to make presstressed reinforcing steel as material, and by adjustable dc source to the presstressed reinforcing steel excitation of switching on, make marmem produce restoring force.The present invention is applied to the memory effect of marmem in the anchor device dexterously, utilizes the restoring force of marmem to change the stressing conditions of prestressed member, thereby controls the stress and the distortion of prestressed member.The present invention is simple in structure, and can utilize control system that it is accurately controlled easily.
A kind of preferred version as technique scheme: the fixed end of described ground tackle is provided with fixedly anchor slab, fixedly the inboard of anchor slab is provided with insulating slab, the stretch-draw end of described ground tackle is provided with backing plate, the inboard of backing plate also is provided with insulating slab, the outside of backing plate is provided with screw rod, screw rod is provided with nut, be equipped with centre bore on described fixedly anchor slab, two insulating slabs, backing plate, nut and screw rods, described presstressed reinforcing steel runs through the centre bore of said fixing anchor slab, two insulating slabs, backing plate, nut and screw rods successively, and the two ends of described presstressed reinforcing steel are provided with heading.The heading at the two ends of presstressed reinforcing steel can prevent that presstressed reinforcing steel from taking out and take off from the ground tackle centre bore, screw nut during stretch-draw, and it is pressed on the backing plate, can keep the prestressing force of system.
Another kind of preferred version has been done improvement to the control of adjustable dc source: this intelligent prestress system also comprises computer and data acquisition unit, and described data acquisition unit is connected with presstressed reinforcing steel, and gathers the strain data of presstressed reinforcing steel; Described data acquisition unit also is connected with computer, and the strain data of presstressed reinforcing steel is imported computer; Described computer also is connected with adjustable dc source, and controls the size of adjustable dc source output current.Read the strain value of presstressed reinforcing steel by computer, and control the output current of adjustable dc source, control the restoring force of presstressed reinforcing steel thus, and final the realization accurately controlled the stress and the distortion of prestressed member.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is the schematic diagram of intelligent prestress system of the present invention.
Fig. 2 is a kind of control system block diagram of intelligent prestress system of the present invention.
The specific embodiment
As shown in Figure 1, intelligent prestress system of the present invention comprises ground tackle and presstressed reinforcing steel 5, and presstressed reinforcing steel 5 is stretched under the low-temperature martensite state by marmem and makes, and the two ends of presstressed reinforcing steel 5 are connected with adjustable dc source 8.Presstressed reinforcing steel 5 can be set to external or the interior two kinds of forms of body according to actual needs, utilize the ground tackle at presstressed reinforcing steel 5 two ends to fix and stretch-draw, ground tackle is divided into fixed end and stretch-draw end two parts, in the present embodiment, fixed end is provided with fixedly anchor slab 6, fixedly the inboard of anchor slab 6 is provided with insulating slab 4, the stretch-draw end is provided with backing plate 3, the inboard of backing plate 3 also is provided with insulating slab 4, the outside of backing plate is provided with screw rod 1, screw rod 1 is provided with nut 2, said fixing anchor slab 6, two insulating slabs 4, backing plate 3, nut 2, be equipped with centre bore on the screw rod 1, presstressed reinforcing steel 5 runs through fixedly anchor slab 6 successively, two insulating slabs 4, backing plate 3, nut 2, the centre bore of screw rod 1, and at two ends formation heading 7.
In the present embodiment, presstressed reinforcing steel 5 is a raw material with marmem NiTi alloy, and diameter is 2 ~ 7mm, can be bought by market.The phase transition temperature claimed range of marmem is: A
s〉=50 ℃ (highest temperature that is higher than the place to use), M
s≤ 20 ℃ (being lower than the lowest temperature of place to use).The supporting ground tackle of presstressed reinforcing steel can be reequiped on the basis of common prestressed anchor and be obtained.Nut 2 can screw along screw rod and withstand on the billet 3, and the epoxy resin after insulating slab 4 usefulness are solidified is made.
When using supporting ground tackle, divide two kinds of situations of fixed end and stretch-draw end to handle.At fixed end presstressed reinforcing steel 5 is passed the fixedly centre bore of anchor slab 6 and insulating slab 4,, form heading 7 with the termination jumping-up of special-purpose button head machine with presstressed reinforcing steel.At the stretch-draw end, presstressed reinforcing steel 5 successively passes insulating slab 4, backing plate 3 and screw rod 1, and screw rod 1 outside has nut 2, makes heading with button head machine equally after passing.After reaching design load with jack tension presstressed reinforcing steel 5, nut 2 screwed along screw rod 1 withstand on the billet 3, pretension then passes on the surface of structural element by screw rod 1, nut 2, backing plate 3, insulating slab 4.Anchor device of the present invention not only is applicable to short and small prestressed concrete member, can also be with simple sleeve spreading in addition, and can repeatedly repeat stretch-draw and loosen.
As shown in Figure 2, control system of the present invention is made up of data acquisition unit, computer, adjustable dc source 8 and lead.Data acquisition unit is connected with presstressed reinforcing steel 5, and gathers the strain data of presstressed reinforcing steel 5; Data acquisition unit also is connected with computer, and the strain data of presstressed reinforcing steel 5 is imported computer; Adjustable dc source 8 also is connected with computer, and is controlled the size of output current by computer.The basic parameter of adjustable dc source is: current strength 0 ~ 50A, voltage 0 ~ 30V can manually or automatically regulate the current strength size according to demand.
After the strain value of presstressed reinforcing steel 5 reaches setting value, marmem presstressed reinforcing steel 5 is controlled excitation.When carrying out the ACTIVE CONTROL excitation, open adjustable dc source 8, control current strength slowly increases, and presstressed reinforcing steel shrinks 5, and it is big that prestress value becomes, and strain value diminishes.By the variation of computer monitor strain value, after strain value produces a desired effect, slowly turn down current strength, until stopping the energising excitation.
Claims (3)
1. an intelligent prestress system comprises ground tackle and presstressed reinforcing steel, it is characterized in that: described presstressed reinforcing steel (5) is stretched under the low-temperature martensite state by marmem and makes, and the two ends of presstressed reinforcing steel (5) are connected with adjustable dc source (8).
2. intelligent prestress system according to claim 1, it is characterized in that: described ground tackle is divided into fixed end and stretch-draw end, the ground tackle fixed end is provided with fixedly anchor slab (6), fixedly the inboard of anchor slab (6) is provided with insulating slab (4), the stretch-draw end of ground tackle is provided with backing plate (3), the inboard of backing plate (3) also is provided with insulating slab (4), the outside of backing plate (3) is provided with screw rod (1), screw rod (1) is provided with nut (2), described fixedly anchor slab (6), two insulating slabs (4), backing plate (3), be equipped with centre bore on nut (2) and the screw rod (1), described presstressed reinforcing steel (5) runs through said fixing anchor slab (6) successively, two insulating slabs (4), backing plate (3), the centre bore of nut (2) and screw rod (1), the two ends of described presstressed reinforcing steel (5) are provided with heading (7).
3. intelligent prestress system according to claim 1 is characterized in that: also comprise computer and data acquisition unit, described data acquisition unit is connected with presstressed reinforcing steel (5), and gathers the strain data of presstressed reinforcing steel (5);
Described data acquisition unit also is connected with computer, and the strain data of presstressed reinforcing steel (5) is imported computer;
Described computer also is connected with adjustable dc source (8), and controls the size of adjustable dc source (8) output current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100281896A CN100445499C (en) | 2005-07-27 | 2005-07-27 | Intelligent prestress system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100281896A CN100445499C (en) | 2005-07-27 | 2005-07-27 | Intelligent prestress system |
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| Publication Number | Publication Date |
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| CN1718970A true CN1718970A (en) | 2006-01-11 |
| CN100445499C CN100445499C (en) | 2008-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100281896A Expired - Fee Related CN100445499C (en) | 2005-07-27 | 2005-07-27 | Intelligent prestress system |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962978A (en) * | 2010-10-20 | 2011-02-02 | 同济大学 | Shape memory alloy anchoring system |
| CN102758538A (en) * | 2012-06-19 | 2012-10-31 | 北京航天万源建筑工程有限责任公司 | Stretching and bricking combined assembling wallboard die trolley |
| CN103046693A (en) * | 2011-11-28 | 2013-04-17 | 王子国 | Pre-stored stress rib with composite structure and manufacturing method thereof |
| CN104070603A (en) * | 2014-05-30 | 2014-10-01 | 江苏固丰管桩集团有限公司 | Tensioning assembly for producing prestressed concrete pile without end plate |
| CN104631846A (en) * | 2014-12-29 | 2015-05-20 | 芜湖赛特施工设备有限公司 | Air brick correcting and flatly laying device |
| CN104806022A (en) * | 2015-04-02 | 2015-07-29 | 徐州工程学院 | Prestressed concrete constructing process for curved shape memory alloy tendon |
| CN104816381A (en) * | 2015-04-02 | 2015-08-05 | 徐州工程学院 | Prestressed concrete construction technology for embedded-type shape memory alloy ribs |
| CN105378129A (en) * | 2013-04-08 | 2016-03-02 | Re-Fer股份公司 | Method for building prestressed concrete structures by means of profiles consisting of a shape-memory alloy, and structure produced using said method |
| CN106482629A (en) * | 2016-11-29 | 2017-03-08 | 上海浦东路桥建设股份有限公司 | Built-in sensors and the method for monitoring xoncrete structure internal strain |
| CN107035203A (en) * | 2017-06-07 | 2017-08-11 | 沈阳建筑大学 | A kind of SMA energy consumers prestressing without bondn system |
| CN109001035A (en) * | 2018-07-25 | 2018-12-14 | 大连理工大学 | A kind of low temperature cold drawing device of marmem |
| CN114263126A (en) * | 2021-12-30 | 2022-04-01 | 山东省路桥集团有限公司 | Method for intelligently controlling crack threshold of concrete beam through strain of SMA wire material or reinforcement material |
| CN114319154A (en) * | 2021-12-30 | 2022-04-12 | 山东省路桥集团有限公司 | Method for intelligently controlling deflection threshold of concrete beam through strain of SMA wire material or rib material |
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| US5093065A (en) * | 1987-06-02 | 1992-03-03 | General Atomics | Prestressing techniques and arrangements |
| GB8820608D0 (en) * | 1988-08-31 | 1988-09-28 | Shell Int Research | Method for placing body of shape memory within tubing |
| JP2759217B2 (en) * | 1989-04-04 | 1998-05-28 | 東急建設式会社 | Introduction method of tensile force of carbon fiber reinforced plastic material |
| AU2114995A (en) * | 1994-10-19 | 1996-05-15 | Dpd, Inc. | Shape-memory material repair system and method of use therefor |
| JP3759792B2 (en) * | 1996-09-19 | 2006-03-29 | 株式会社竹中工務店 | Self-healing mechanism of structural members |
| US6170202B1 (en) * | 1997-06-12 | 2001-01-09 | University Of Puerto Rico | Building system using shape memory alloy members |
| GB2358880A (en) * | 2000-01-12 | 2001-08-08 | Stuart Ian Jackman | Method for reinforcing material |
| JP4151053B2 (en) * | 2003-04-16 | 2008-09-17 | 株式会社竹中工務店 | Method for producing high-strength, high-toughness cementitious material |
| CN1259513C (en) * | 2003-08-28 | 2006-06-14 | 东南大学 | High-load bearing absorber |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962978A (en) * | 2010-10-20 | 2011-02-02 | 同济大学 | Shape memory alloy anchoring system |
| CN103046693A (en) * | 2011-11-28 | 2013-04-17 | 王子国 | Pre-stored stress rib with composite structure and manufacturing method thereof |
| CN102758538B (en) * | 2012-06-19 | 2016-01-06 | 北京航天万源建筑工程有限责任公司 | One is drawn and is built component building assembled wallboard mould car |
| CN102758538A (en) * | 2012-06-19 | 2012-10-31 | 北京航天万源建筑工程有限责任公司 | Stretching and bricking combined assembling wallboard die trolley |
| CN105378129A (en) * | 2013-04-08 | 2016-03-02 | Re-Fer股份公司 | Method for building prestressed concrete structures by means of profiles consisting of a shape-memory alloy, and structure produced using said method |
| CN104070603A (en) * | 2014-05-30 | 2014-10-01 | 江苏固丰管桩集团有限公司 | Tensioning assembly for producing prestressed concrete pile without end plate |
| CN104070603B (en) * | 2014-05-30 | 2018-06-01 | 江苏固丰管桩集团有限公司 | For producing the tensioning component of end-plate-free prestressed-concrete pile |
| CN104631846A (en) * | 2014-12-29 | 2015-05-20 | 芜湖赛特施工设备有限公司 | Air brick correcting and flatly laying device |
| CN104816381A (en) * | 2015-04-02 | 2015-08-05 | 徐州工程学院 | Prestressed concrete construction technology for embedded-type shape memory alloy ribs |
| CN104806022A (en) * | 2015-04-02 | 2015-07-29 | 徐州工程学院 | Prestressed concrete constructing process for curved shape memory alloy tendon |
| CN104806022B (en) * | 2015-04-02 | 2018-09-28 | 徐州工程学院 | A kind of rib prestressed concrete construction process of shaped form marmem |
| CN106482629A (en) * | 2016-11-29 | 2017-03-08 | 上海浦东路桥建设股份有限公司 | Built-in sensors and the method for monitoring xoncrete structure internal strain |
| CN107035203A (en) * | 2017-06-07 | 2017-08-11 | 沈阳建筑大学 | A kind of SMA energy consumers prestressing without bondn system |
| CN109001035A (en) * | 2018-07-25 | 2018-12-14 | 大连理工大学 | A kind of low temperature cold drawing device of marmem |
| CN114263126A (en) * | 2021-12-30 | 2022-04-01 | 山东省路桥集团有限公司 | Method for intelligently controlling crack threshold of concrete beam through strain of SMA wire material or reinforcement material |
| CN114319154A (en) * | 2021-12-30 | 2022-04-12 | 山东省路桥集团有限公司 | Method for intelligently controlling deflection threshold of concrete beam through strain of SMA wire material or rib material |
| CN114319154B (en) * | 2021-12-30 | 2024-03-12 | 山东省路桥集团有限公司 | Intelligent control method for deflection threshold of concrete beam by using SMA wire or rib strain |
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| CN100445499C (en) | 2008-12-24 |
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Granted publication date: 20081224 Termination date: 20110727 |