CN202519576U - External prestressing reinforcing device for pier body - Google Patents
External prestressing reinforcing device for pier body Download PDFInfo
- Publication number
- CN202519576U CN202519576U CN2012201420336U CN201220142033U CN202519576U CN 202519576 U CN202519576 U CN 202519576U CN 2012201420336 U CN2012201420336 U CN 2012201420336U CN 201220142033 U CN201220142033 U CN 201220142033U CN 202519576 U CN202519576 U CN 202519576U
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- external prestressing
- pier
- reinforcing device
- sma
- bridge pier
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Abstract
The utility model discloses an external prestressing reinforcing device for a pier body. The external prestressing reinforcing device comprises an SMA (Shape Memory Alloy) wire and a power supply, wherein the SMA wire is wound on the pier body; and two ends of the SMA wire are connected to the power supply. When the external prestressing reinforcing device disclosed by the utility model works, the SMA wire is pre-strained and then is wound on the pier body; when the external prestressing reinforcing device is required to drive, the power supply is connected and the SMA wire is heated to generate phase change and recovery strain; and the strain recovery of the SMA wire is limited by the boundary of the pier body, and thus the SMA wire generates great recovery stress and further the aim of controlling the deformation of the pier is achieved. According to the external prestressing reinforcing device disclosed by the utility model, the defects of transverse reinforcing bars are made up; after main restraint for a pier stud is increased, the pier stud can be prevented from being sheared and damaged; and meanwhile, the bending resistance of the pier stud is improved.
Description
Technical field
The utility model relates to a kind of bridge pier reinforcing technique, particularly a kind of bridge pier external prestressing strengthening device.
Background technology
The bridge collapse of many destruction property causes by the destruction of one or more steel concrete pier stud in the past earthquake.Tower earthquake in Luo Ma-Pu in 1989, earthquake of northern mountain range and nineteen ninety-five in 1994 get the Japan Kobe earthquake disaster and can find out; Existing bridge pier is easy to damage in earthquake centre doughtily, this impel the researcher over the ground earthquake centre RC bridge pier damage with destroy reason and further study.Research proof, the bridge pier majority that damages in the past earthquake causes because of bend ductility deficiency or shock resistance inadequately.The reason that ductility is not enough has: 1, the horizontal under-reinforced of bridge pier; 2, the lapped length of steel bar in areas of plasticity hinge is not enough, and outside the RC bridge pier, adding steel sleeve or fibre reinforced composites (FRP) thereby applying passive bound is the common method that improves its ductility.
Though the passive bound method is generally accepted and used all over the world, research shows: the effect that bridge pier is applied initiatively constraint can be better.These researchs comprise carries out the initiatively material test research of binding effect aspect; The research concrete receives the fundamental characteristics after the initiatively constraint; Discussion is through applying the feasibility that initiatively constraint improves its anti-seismic performance to concrete component.Wherein, some is that research realizes initiatively constraint with the prestressing force stirrup, and other are to attempt to use the pre-stress fibre reinforced composite to realize initiatively constraint.Result of study shows: pier stud can be avoided its shear failure after increasing initiatively constraint, also can improve its anti-bending strength simultaneously.Although initiatively restriction technique has many advantages, it is actual in some difficulty, and the technology of restraint forces for example is provided at the scene.
The utility model content
The utility model provides a kind of use marmem (SMA) that the RC bridge pier is applied the initiatively bridge pier external prestressing strengthening device of constraint for solving the problems of the technologies described above.
To achieve these goals, the utility model adopts following technical scheme.
The bridge pier external prestressing strengthening device of the utility model comprises SMA silk and power supply, and said SMA silk is wrapped on the bridge pier body, and the two ends of SMA silk are connected on the power supply.
As the further improvement of the utility model, can on the basis of the utility model technology, on the SMA silk, arrange foil gauge; Be connected on the resistance strain gauge, through the strain of real-time monitoring SMA silk, data obtain the distortion size of bridge pier thus; Through computer control power supply; When distortion surpassed certain limit, computer control electric power starting let the SMA silk that bridge pier is implemented to reinforce.
During the work of the utility model, at first give the SMA silk, then it is wrapped on the bridge pier body with prestrain; Energized when needs drive; Heating SMA silk undergoes phase transition the generation recovery strain, but its strain of bridge pier boundary limitation recovers; So the SMA silk produces very big recovery stress, thereby reach the purpose that the control bridge pier is out of shape.
The operating principle of the utility model does, when the SMA of low temperature after distortion under the external force, if heating surpasses the transformation temperature of material; Will recover the shape under the original high temperature austenite state, and in such recovery process, if material is in free state; Then produce and shrink, distortion disappears; If material suffers restraints when shrinking, shape is recovered to be prevented from, and then will produce bigger recovery stress at material internal, big or small synthermal, the initial residual of recovery stress be out of shape and degree of transformation relevant.Utilize this character can SMA be stretched at normal temperatures; Be made into the spiral presstressed reinforcing steel again; At normal temperatures with its typing; After logical direct current of voltage regulation produced high temperature, it returned to generation two kinds of trend of original state: the one, recover original linear pattern trend, and the 2nd, the trend of length before recovery SMA stretches.We can be inhibited first kind of trend through anchoring SMA muscle, and second kind of trend uses restraint through stopping of concrete column under the prerequisite of anchoring, and the recovery stress of material internal generation has just been realized structure ring is applied to prestressed like this.
Bridge pier for bridge types such as beam bridge, T type rigid frame bridge and continuous rigid frame bridges; Especially thin-wall piers can replace common reinforcing bar with SMA, only needs the energising heating to make presstressed reinforcing steel produce stress; Saved the stretching process that common plain bars needs; Especially for the structure that is difficult to tension reinforcing steel bar owing to the inconvenience on the space, both save the duration, guaranteed workmanship again.
The beneficial effect of the utility model is, remedied the horizontal under-reinforced of bridge pier, pier stud is increased initiatively constraint after, can avoid its shear failure, also can improve its anti-bending strength simultaneously.
Description of drawings
Fig. 1 is the plane structure sketch map of the utility model.
Fig. 2 is the isometric plan of SMA silk on the bridge pier body of the utility model.
Wherein, 1, bridge pier; 2, SMA silk; 3, dc source.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Embodiment 1:
Present embodiment comprises the SMA silk 2 that is spirally wound on the bridge pier 1, and a dc source 3.At first, the SMA silk of appropriate length is selected in the bridge pier zone that reinforces as required, makes the length of SMA silk can twine the zone that needs reinforcement fully.To SMA silk 2 with prestrain; Then it is wrapped on the bridge pier 1, arranges according to stereogram as shown in Figure 2, the first lap SMA silk that twine on top is parallel around one week of cylinder; At different levelsly then twine down by certain angle of inclination spiral, the bottom last lap is equally around a full circle.The SMA silk connects dc source 3 at its two ends through lead after twining and finishing, and in the bridge pier that needs reinforcement, turns on the power switch, and SMA silk 2 is heated.Make SMA recover its original shape because the SME that SMA has, temperature raise, produce recovery strain; But its strain of bridge pier boundary limitation recovers, so SMA silk 2 produces very big recovery stress, and recovery stress is in the opposite direction with pressing in the cylinder; Therefore improve the stand under load situation of bridge pier 1 greatly; Controlled the distortion of bridge pier 1, improved it and bear interior the pressure and the expanded radially ability, made it not by results in premature failure.
Embodiment 2:
If want to realize real-time monitoring, reinforcing in real time, can on the basis of embodiment 1, on SMA silk 2, arrange foil gauge to bridge pier; Be connected on the resistance strain gauge, through the strain of real-time monitoring SMA silk 2, data obtain the distortion size of bridge pier 1 thus; Switching through computer control dc source; When distortion surpassed certain limit, computer control electric power starting let the SMA silk that bridge pier is implemented to reinforce.
Though the above-mentioned accompanying drawing that combines is described the specific embodiment of the utility model; But be not restriction to the utility model protection domain; One of ordinary skill in the art should be understood that; On the basis of the technical scheme of the utility model, those skilled in the art need not pay various modifications that creative work can make or distortion still in the protection domain of the utility model.
Claims (2)
1. a bridge pier external prestressing strengthening device is characterized in that, comprises SMA silk and power supply, and said SMA silk is wrapped on the bridge pier body, and the two ends of SMA silk are connected on the power supply.
2. bridge pier external prestressing strengthening device as claimed in claim 1 is characterized in that on the SMA silk, be provided with foil gauge, foil gauge is connected on the resistance strain gauge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201420336U CN202519576U (en) | 2012-04-06 | 2012-04-06 | External prestressing reinforcing device for pier body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201420336U CN202519576U (en) | 2012-04-06 | 2012-04-06 | External prestressing reinforcing device for pier body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202519576U true CN202519576U (en) | 2012-11-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2012201420336U Expired - Lifetime CN202519576U (en) | 2012-04-06 | 2012-04-06 | External prestressing reinforcing device for pier body |
Country Status (1)
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| CN (1) | CN202519576U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106639351A (en) * | 2016-12-23 | 2017-05-10 | 大连理工大学 | Reinforcing method for winding thermal excitation embedded shape memory alloy wires on concrete column |
| CN108917584A (en) * | 2018-07-10 | 2018-11-30 | 大连理工大学 | Composite structure column system is actively adjusted from perception based on marmem |
| CN110359379A (en) * | 2019-07-16 | 2019-10-22 | 西安建筑科技大学 | Damaged bridge pier mixed reinforcement structure based on marmem and carbon cloth |
| CN110700612A (en) * | 2019-09-29 | 2020-01-17 | 西安工程大学 | RC roof beam reinforcing apparatus based on shape memory alloy and carbon fiber cloth |
| CN112982194A (en) * | 2019-09-04 | 2021-06-18 | 石家庄铁道大学 | Assembly device for railway bridge beam end jacking maintenance |
| CN113914362A (en) * | 2021-09-30 | 2022-01-11 | 国网北京市电力公司 | Shape memory alloy driving fiber reinforced polymer material, and preparation method and application thereof |
-
2012
- 2012-04-06 CN CN2012201420336U patent/CN202519576U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106639351A (en) * | 2016-12-23 | 2017-05-10 | 大连理工大学 | Reinforcing method for winding thermal excitation embedded shape memory alloy wires on concrete column |
| CN108917584A (en) * | 2018-07-10 | 2018-11-30 | 大连理工大学 | Composite structure column system is actively adjusted from perception based on marmem |
| CN110359379A (en) * | 2019-07-16 | 2019-10-22 | 西安建筑科技大学 | Damaged bridge pier mixed reinforcement structure based on marmem and carbon cloth |
| CN112982194A (en) * | 2019-09-04 | 2021-06-18 | 石家庄铁道大学 | Assembly device for railway bridge beam end jacking maintenance |
| CN112982194B (en) * | 2019-09-04 | 2022-08-30 | 石家庄铁道大学 | Assembly device for railway bridge beam end jacking maintenance |
| CN110700612A (en) * | 2019-09-29 | 2020-01-17 | 西安工程大学 | RC roof beam reinforcing apparatus based on shape memory alloy and carbon fiber cloth |
| CN113914362A (en) * | 2021-09-30 | 2022-01-11 | 国网北京市电力公司 | Shape memory alloy driving fiber reinforced polymer material, and preparation method and application thereof |
| CN113914362B (en) * | 2021-09-30 | 2023-11-14 | 国网北京市电力公司 | Shape memory alloy driven fiber reinforced polymer material, and preparation method and application thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121107 |
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| CX01 | Expiry of patent term |