CN205259390U - Isolation bearing structure of building - Google Patents
Isolation bearing structure of building Download PDFInfo
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- CN205259390U CN205259390U CN201520964060.5U CN201520964060U CN205259390U CN 205259390 U CN205259390 U CN 205259390U CN 201520964060 U CN201520964060 U CN 201520964060U CN 205259390 U CN205259390 U CN 205259390U
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- isolating pedestal
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- shock isolating
- upper junction
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- 238000002955 isolation Methods 0.000 title abstract description 27
- 230000035939 shock Effects 0.000 claims description 72
- 230000003139 buffering Effects 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 abstract description 12
- 238000005755 formation reaction Methods 0.000 abstract 1
- 238000009413 insulation Methods 0.000 description 24
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000009415 formwork Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000003078 antioxidant Effects 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000116 mitigating Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 210000001624 Hip Anatomy 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000004079 fireproofing Methods 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 239000007901 soft capsule Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Abstract
The utility model relates to a building and the isolation technology field of structures specifically are the isolation bearing structures of a building or structures, and it includes isolation bearing, upper junction plate, setting lower embedded plate and the connecting plate down on the foundation structure of lower part, lower connecting plate pass through connecting bolt and install under on the embedded plate, isolation bearing installs under between connecting plate and the upper junction plate, tensile stop device is installed through connecting bolt to the upper junction plate, and tensile stop device offers the through -hole of counter bore form, and isolation bearing and connecting plate down all contain downthehole greatly at the counter bore, the upper portion of upper junction plate support to link to each other upper portion building structure's last embedded plate still is fixed with through connecting bolt. The utility model discloses simple structure, can furthest reduce because of seismic wave, equipment, vehicle and pedestrian's vibrations to building / calamity that structures caused, effectively ensured the people's life and property safety.
Description
Technical field
The utility model relates to the seismic isolation technology field of building and structures, the specifically shock isolating pedestal apparatus structure of a kind of building or structures.
Background technology
Earthquake brings great harm to human life's property, and the important topic that the building shockproof, damping performance is good is facing mankind is built in design. In order to resist the destruction of earthquake to building, traditional anti-seismic technology is size, the increase beam column arrangement of reinforcement by increasing beam cross-section and improves the methods such as construction material intensity and realize. Briefly, the Seismic Philosophy of traditional architecture may be summarized to be " just to make just ", be indivisible rigid body by building foundation and superstructure design, this design can not be resisted horizontal shear failure power, and horizontal shear force will cause whole building inclination and collapse.
Building subtracts seismic isolation technology and is different from traditional anti-seismic technology, and its thought is " defeating a force with a tenderness ". subtract seismic isolation technology refer to building certain one deck position the Seismic Isolation of Isolation Layer being made up of the parts such as shock isolating pedestal and damper is set, make the earthquake motion of superstructure obtain horizontal composition insulation, wherein shock isolating pedestal can be stabilized and supports constantly building weight, follow the horizontal distortion of building, and there is suitable elastic restoring force, and damper can be used in absorption inputting seismic energy, finally to extend the natural vibration period of total system, reduce the seismic energy of input superstructure, reach the shockproof requirement of expection, guarantee that interior of building property does not suffer a loss, ensure life security.
Calendar year 2001, China included shock-insulation building design in earthquake resistant code in first, for the development of shock-insulation building is laid a good foundation. After this promulgated again " laminated rubber damping bearing seismic isolation technology code ", for the design of isolation structure provides technical basis. 2010 editions clear and definite shock insulations of earthquake resistant code are technology of a kind of effective earthquake disaster mitigation, are applicable to any area and use, and in the time that super earthquake intensity earthquake occurs in an area, shock-insulation building often can effectively play anti-fall effect of collapsing. So shock insulation and energy-dissipating and shock-absorbing are the effective technologies of building structure earthquake disaster mitigation.
The technology that existing shock insulation is conventional is the earthquake isolating equipment that horizontal flexibility is set in building bottom, reaches the object of softening structure, reduction rigidity, thus the cycle of shake certainly of extending structure, the earthquake response of minimizing structure. This class earthquake isolating equipment mainly contains the frame mode such as laminated rubber bearing isolator and steel ball dish isolator, and laminated rubber bearing application at most. When small earthquake, earthquake isolating equipment makes building substantially keep motionless, and when middle violent earthquake, shock isolation system produces horizontal distortion, absorbs seismic energy, performance shock insulation, shock dropping effect. The shortcoming of this class earthquake isolating equipment is: material requirements is high, and cost is high, and complex manufacturing technology is only suitable for level of isolation seismic wave, is unsuitable for isolating vertical seismic wave. In production be badly in need of exploitation a kind of economy, be efficiently suitable for common low layer tier building especially rural house adopt shock insulation material. Open source literature has also been reported the earthquake isolation bearing of some buildings, for example:
1, Chinese patent: a kind of earthquake isolation bearing for building infrastructure, application number: 201010260181.3, the applying date: 2010.08.21, applicant: Chen Maoxiang, address: 628017 No. 373, Li Zhou West Road, Guangyuan City Li Zhou district of Sichuan Province Yi Ji factories, inventor: Chen Maoxiang, summary: a kind of earthquake isolation bearing for building infrastructure, comprise pedestal, it is characterized in that: described pedestal is hollow rubber pedestal, and its inner chamber is filled with gas or liquid. A kind of improvement is that described pedestal forms cuboid structure outward, and its inner chamber is provided with two chambers in left and right, between two chambers, is provided with flat gas-liquid channel, also comprises a gas-liquid filling nozzle. The waist that another kind of improvement is described hollow pedestal is provided with a ring-type damping trough. Also having a kind of improvement is that the inner chamber of described hollow pedestal is made up of the high pressure resistant elastomeric material filling of porous. This invention product is installed between top-out and basis, bottom, earthquake isolation effect is good, it changes the stress form by compression of existing solid rubber isolation cushion into shear pattern, horizontal direction has larger flexibility, in ensureing enough vertical bearing capacities, can bear certain vertical displacement, possess the ability of certain vertical seismic wave of isolation.
2, Chinese patent: building foundation isolation reset structure, application number: 201110168540.7, the applying date: 2011.06.21, applicant: Wei Longwu, address: 210,008 16 401, Hu Jing gardens, Nanjing, Nanjing, inventor: defend Long Wuweihai, Guo Tong, summary: building foundation isolation reset structure relates to a kind of building foundation isolation reset structure, this structure comprises: by sliding isolated bearing (1), rubber laminated vibration-isolating support base (2), the shock insulation energy-dissipation structure that rigid tray (3) forms, by basis (4), shock insulation ditch (5), counter-force pier (6), the buffering resetting structure that buffer limiter (7) forms, the superstructure (8) of building is positioned on rigid tray (3), rigid tray (3) is positioned at rubber laminated vibration-isolating support base (2) and sliding isolated bearing (1) is upper, and rubber laminated vibration-isolating support base (2) and sliding isolated bearing (1) lay respectively on basis (4), be provided with shock insulation ditch (5) at the periphery of building, together with shock insulation ditch (5) waters knot with the basis (4) of building periphery, counter-force pier (6) is distributed on the abutment wall (5-1) of shock insulation ditch, and be consolidated with basis (4), buffer limiter (7) is fixed on the top of counter-force pier (6), and other end end is fixed on sliding isolated bearing (1).
3, Chinese patent: building earthquake isolating equipment, application number: 201320141075.2, the applying date: 2013.03.26, patentee: Xinpu Construction Group Co.,Ltd, address: 450046 commercial affairs Nei Huanxinpu mansions, Zheng Dong new district, Zhengzhou City Henan Province, inventor: Liu Yi, Jiang Yaowu, Li Yan, Zhang Jie, Wang Zhen, Wang Hongyu, high Yongan, Chen Feng, summary: this utility model discloses a kind of building earthquake isolating equipment, comprise the upper backup pad and the lower support that are connected with building, be provided with and vertically admittedly lock gripper shoe in a side of upper backup pad, be provided with damping shock absorption plate at the opposite side of upper backup pad, the structure of lower supporting plate is identical with the structure of upper backup pad, and vertical on upper backup pad locked on the damping shock absorption plate that gripper shoe is fastened on lower supporting plate admittedly, in cavity between upper backup pad and lower supporting plate, be provided with air cushion flexible pocket. between the stake and post of building, between post and post, between platform and post, between pier and post, between post and bearing, between post and beam, between bearing and beam by the utility model is installed, main by damping shock absorption plate shock insulation on above-below direction, if generation left and right displacement, weight on upper backup pad can be pressed in air cushion flexible pocket, by Inflatable mattress soft capsule energy-absorbing shock insulation. reach the object of energy-absorbing shock insulation.
4, Chinese patent: a kind of basement bottom of the building earthquake isolating equipment, application number: 201320451928.2, the applying date: 2013.07.29, patentee: Hua Yu architectural design corporation, Ltd of Shenyang City, address: 110168 No. 6-9, Xuecheng roads, Muddy Southern District, Shenyang City, Liaoning Province, inventor: Weng Wei, Wang Yi, summary: a kind of basement bottom of the building earthquake isolating equipment, overcome existing structure anti-seismic structure and utilized plastic deformation after the surrender of constructure body structure lateral resistant member and the energy of the earthquake that dissipates, because causing lateral resistant member, some factor has problems, can have a strong impact on the problem of structural seismic performance, feature is in foundation columns, to be fixedly connected with foundation columns beam, at soffit, upper strata and foundation columns top surface of the beam pre-embedded steel slab, 2 pre-buried steel plates respectively with upper strata beam and foundation columns beam in steel bar welding be connected together, in the bolt hole of pre-embedded steel slab, welding high-strength bolt also fixes with supporting nut check, between foundation columns beam and upper strata beam, fixedly mount shock isolating pedestal, beneficial effect is the natural vibration period that can extend total, increase the damping of structural system, reduce the seismic force that lateral resistant member is born, the security of structure while improving earthquake, prevent the destruction of vibration movement and overturning and the structural elements of interior of building article, and can suppress the sense of discomfort of vibrating.
5, Chinese patent: architectural vibration-insulation rubber supporting seat, the applying date: 2009.2.20, application number: 200910014324.X, applicant: Shandong Meicheng Technology Co., Ltd, address: 262200 Dongshou Road Nan, Mizhou Road, Zhucheng City, Weifang City, Shandong Province, inventor: Zhang Lei, summary: this disclosure of the invention a kind of architectural vibration-insulation rubber supporting seat, it is characterized in that, lead for retractable pencil upper, lower two ends respectively with upper end steel plate, lower end steel plate connects, between upper end steel plate and lower end steel plate, be provided with multiple inner rubber, each inner rubber and inner thin steel plate are superimposed, inner rubber and upper, lower end steel plate and outer protection rubber and lead for retractable pencil are through high temperature, high pressure sulfides, on, lower end steel plate is square structure, upper, the corner location of lower end steel plate is equipped with the bolt hole being connected with building. by above setting, the utility model has improved the defect of traditional architecture shock insulation design, can meet the demand of building for shock resistance.
Summary of the invention
The purpose of this utility model is to provide a kind of building different from the building earthquake isolating equipment of prior art or structures shock isolating pedestal structure, on the basis of original building shock isolating pedestal performance advantage, increase fire prevention, spacing, vertical tension, the anti-side direction characteristic such as topple, all deficiencies of architectural vibration-insulation bearing are made up, can farthest reduce the disaster build/structures being caused because of seismic wave, equipment, vehicle and pedestrian's vibrations, effectively ensure the people's life and property safety.
To achieve these goals, the technical solution adopted in the utility model is:
A shock isolating pedestal structure for building, it comprises shock isolating pedestal, upper junction plate, is arranged on lower embedded board and lower connecting plate on the foundation structure of bottom, and described lower connecting plate is arranged on lower embedded board by connecting bolt; Shock isolating pedestal is arranged between lower connecting plate and upper junction plate; Upper junction plate is provided with tension stopping means by connecting bolt, and tension stopping means offers the through hole of counterbore shape, and shock isolating pedestal and lower connecting plate are included in the macropore of counterbore; The top of described upper junction plate is also fixed with by connecting bolt the upper embedded board that supports the top-out structure that is connected.
Described upper junction plate and lower connecting plate be rounded shape all.
The macropore bottom of the counterbore of offering on described tension stopping means is provided with Quadratic Damping bumper ring.
Described Quadratic Damping bumper ring is air spring damper bumper ring or damper sponge ring buffering, in the time that seismic wave causes the left and right vibrations of building to tilt, tension stopping means is and then left and right vibrations inclination also, lower connecting plate bumps against the Quadratic Damping bumper ring on tension stopping means, reduce the earthquake load producing due to earthquake, avoid greatly building to topple over.
Described shock isolating pedestal adopts lead-rubber shock isolating pedestal, and it is that perforate note lead forms in General Purpose Rubber shock isolating pedestal, has higher damping, can effectively reduce the geological process of structure, reduces the displacement of Seismic Isolation of Isolation Layer. In rubber, also mix antioxidant, can greatly improve the service life of shock insulation rubber bearing.
According to the structure of building and ground, the seat structure installation of can turning upside down, and can be to mounting means otherwise designed, its assembling and install and all use bolted on connection. Bearing can carry out after installing and should post concrete reaching design strength, and tension stopping means, Quadratic Damping bumper ring, lower connecting plate, shock isolating pedestal, upper junction plate are installed successively. The upright alignment of the upper and lower steel plate level of major control in installation process, bearing axis is consistent with mast axis, and tighten the screws prevents loose shift. The upright alignment of embedded board, upper junction plate, lower embedded board and lower connecting plate level in guarantee, ensure that shock isolating pedestal is consistent with bottom foundation structure axis, tighten the screws prevents loose shift, install rear to upper embedded board end face absolute altitude, center line do last check with measure errorless after, carry out the construction of top-out structure formwork.
Outstanding substantive distinguishing features of the present utility model and significant progress are:
1, seat structure of the present utility model is different from the building earthquake isolating equipment of prior art, it is on the basis of original building shock isolating pedestal performance advantage, increase fire prevention, spacing, vertical tension, the anti-side direction characteristic such as topple, all deficiencies of architectural vibration-insulation bearing are made up, " defeat a force with a tenderness " and effectively eliminate level of isolation seismic wave and vertical seismic wave, thereby farthest reduce disaster building or structures being caused because of seismic wave, equipment, vehicle and pedestrian's vibrations, effectively ensured the people's life and property safety; The utility model newly also can use on structures.
2, seat structure of the present utility model adopts tension stopping means and lower connecting plate, can avoid shock isolating pedestal and Quadratic Damping bumper ring to be burnt out by fire, plays fireproofing function.
What 3, seat structure of the present utility model adopted avoids shock isolating pedestal and Quadratic Damping bumper ring flexible structure, can extend the natural vibration period of whole seat structure, reduce the earthquake load producing due to earthquake, reduce the displacement structure increasing due to the prolongation of free vibration period of structure, and bear the load of building by powerful vertical rigidity, can the more than 90% of earthquake energy.
4, the lead core rubber support that seat structure of the present utility model adopts is on the basis of common shock isolating pedestal, add one or more lead for retractable pencil in inside, after lead for retractable pencil is pressed into and rubber support combine together and follow detrusion, this bearing is the one-piece type earthquake isolating equipment of damping mechanism that the restoring means stabilized by rubber support and plumbous energy absorbing device form; Its detrusion by laminated rubber realizes the displacement of bearing, distortion by lead for retractable pencil in bearing absorbs seismic energy, be the most ripe, the most widely used shock insulation product that subtracts of technology in the world at present, and in rubber, also mix antioxidant, the service life that can greatly improve shock insulation rubber bearing.
Brief description of the drawings
The installment state schematic diagram of the shock isolating pedestal structure of the building that Fig. 1 provides for the utility model embodiment 1;
The installment state schematic diagram of the shock isolating pedestal structure of the building that Fig. 2 provides for the utility model embodiment 2;
Fig. 3 is that the shock isolating pedestal of Fig. 1 is in the schematic diagram of the boundary state of stress;
Title in figure and sequence number are:
Upper embedded board 1, shock isolating pedestal 2, upper junction plate 3, connecting bolt 4, tension stopping means 5, Quadratic Damping bumper ring 6, lower embedded board 7, lower connecting plate 8.
Detailed description of the invention
For the more detailed the utility model of introducing, below in conjunction with drawings and Examples, the utility model is described further.
As shown in the figure:
Embodiment 1
The shock isolating pedestal structure of building, it comprises shock isolating pedestal 2, upper junction plate 3, is arranged on lower embedded board 7 and lower connecting plate 8 on the foundation structure of bottom, and described lower connecting plate 8 is arranged on lower embedded board 7 by connecting bolt 4; Shock isolating pedestal 2 is arranged between lower connecting plate 8 and upper junction plate 3; Upper junction plate 3 is provided with tension stopping means 5 by connecting bolt 4, and tension stopping means 5 offers the through hole that is counterbore shape, and shock isolating pedestal 2 and lower connecting plate 8 are included in the macropore of counterbore; The top of described upper junction plate 3 is also fixed with by connecting bolt 4 the upper embedded board 1 that supports the top-out structure that is connected.
The macropore bottom of the counterbore of offering on described tension stopping means 5 is provided with Quadratic Damping bumper ring 6.
Described Quadratic Damping bumper ring 6 is air spring damper bumper ring or damper sponge ring buffering.
Described shock isolating pedestal 2 adopts lead-rubber shock isolating pedestal.
Being arranged on after bottom foundation structure reaches design strength of seat structure carried out.
The installation of described seat structure, embedded board 1, upper junction plate 3, lower embedded board 7 and the upright alignment of lower connecting plate 8 levels in guarantee, ensure that shock isolating pedestal 2 is consistent with bottom foundation structure axis, tighten the screws prevents loose shift, install rear to upper embedded board 1 end face absolute altitude, center line do last check with measure errorless after, carry out the construction of top-out structure formwork.
All rounded shapes of described upper junction plate 3 and lower connecting plate 8.
Embodiment 2
The shock isolating pedestal structure of building, for the installation of turning upside down of the seat structure of embodiment 1, it comprises shock isolating pedestal 2, upper junction plate 3, is arranged on upper embedded board 1 and lower connecting plate 8 on the foundation structure of bottom, described upper junction plate 3 is arranged on upper embedded board 1 by connecting bolt 4, and shock isolating pedestal 2 is arranged between lower connecting plate 8 and upper junction plate 3; Upper junction plate 3 is provided with tension stopping means 5 by connecting bolt 4, and tension stopping means 5 offers the through hole that is counterbore shape, and shock isolating pedestal 2 and lower connecting plate 8 are included in the macropore of counterbore; The top of described lower connecting plate 8 is also fixed with by connecting bolt 4 the lower embedded board 7 that supports the top-out structure that is connected.
The macropore bottom of the counterbore of offering on described tension stopping means 5 is provided with Quadratic Damping bumper ring 6.
Described Quadratic Damping bumper ring 6 is air spring damper bumper ring or damper sponge ring buffering.
Described shock isolating pedestal 2 adopts lead-rubber shock isolating pedestal.
Being arranged on after bottom foundation structure reaches design strength of seat structure carried out.
The installation of described seat structure, embedded board 1, upper junction plate 3, lower embedded board 7 and the upright alignment of lower connecting plate 8 levels in guarantee, ensure that shock isolating pedestal 2 is consistent with bottom foundation structure axis, tighten the screws prevents loose shift, install rear to upper embedded board 1 end face absolute altitude, center line do last check with measure errorless after, carry out the construction of top-out structure formwork.
All rounded shapes of described upper junction plate 3 and lower connecting plate 8.
Above-mentioned explanation is not to restriction of the present utility model; the utility model is also not limited to above-mentioned example, and those skilled in the art, in essential scope of the present utility model; variation, remodeling, interpolation or the replacement made, all should belong to protection domain of the present utility model.
Claims (6)
1. the shock isolating pedestal structure of a building, it is characterized in that: comprise shock isolating pedestal (2), upper junction plate (3), be arranged on lower embedded board (7) and lower connecting plate (8) on the foundation structure of bottom, described lower connecting plate (8) is arranged on lower embedded board (7) by connecting bolt (4); Shock isolating pedestal (2) is arranged between lower connecting plate (8) and upper junction plate (3); Upper junction plate (3) is provided with tension stopping means (5) by connecting bolt (4), and tension stopping means (5) offers the through hole of counterbore shape, and shock isolating pedestal (2) and lower connecting plate (8) are included in the macropore of counterbore; The top of described upper junction plate (3) is also fixed with by connecting bolt (4) the upper embedded board (1) that supports the top-out structure that is connected.
2. the shock isolating pedestal structure of building according to claim 1, is characterized in that: the macropore bottom of the counterbore of offering on described tension stopping means (5) is provided with Quadratic Damping bumper ring (6).
3. the shock isolating pedestal structure of building according to claim 2, is characterized in that: described Quadratic Damping bumper ring (6) is air spring damper bumper ring or damper sponge ring buffering.
4. the shock isolating pedestal structure of building according to claim 1, is characterized in that: described shock isolating pedestal (2) adopts lead-rubber shock isolating pedestal.
5. the shock isolating pedestal structure of building according to claim 1, is characterized in that: the described rounded shape of upper junction plate (3).
6. the shock isolating pedestal structure of building according to claim 1, is characterized in that: the described rounded shape of lower connecting plate (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520964060.5U CN205259390U (en) | 2015-11-30 | 2015-11-30 | Isolation bearing structure of building |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520964060.5U CN205259390U (en) | 2015-11-30 | 2015-11-30 | Isolation bearing structure of building |
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| Publication Number | Publication Date |
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| CN205259390U true CN205259390U (en) | 2016-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520964060.5U Active CN205259390U (en) | 2015-11-30 | 2015-11-30 | Isolation bearing structure of building |
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| CN (1) | CN205259390U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106337503A (en) * | 2016-10-11 | 2017-01-18 | 云南震安减震科技股份有限公司 | Prefabricated compound shock isolation member for assembling type building |
| CN106368480A (en) * | 2016-10-11 | 2017-02-01 | 云南震安减震科技股份有限公司 | Assembly type prefabricated damping component for building |
| CN107060128A (en) * | 2017-06-07 | 2017-08-18 | 山西大学 | A kind of shock insulation limit protection device |
-
2015
- 2015-11-30 CN CN201520964060.5U patent/CN205259390U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106337503A (en) * | 2016-10-11 | 2017-01-18 | 云南震安减震科技股份有限公司 | Prefabricated compound shock isolation member for assembling type building |
| CN106368480A (en) * | 2016-10-11 | 2017-02-01 | 云南震安减震科技股份有限公司 | Assembly type prefabricated damping component for building |
| CN107060128A (en) * | 2017-06-07 | 2017-08-18 | 山西大学 | A kind of shock insulation limit protection device |
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