CN111852054B - Masonry wall antidetonation is strengthened device - Google Patents
Masonry wall antidetonation is strengthened device Download PDFInfo
- Publication number
- CN111852054B CN111852054B CN202010784193.XA CN202010784193A CN111852054B CN 111852054 B CN111852054 B CN 111852054B CN 202010784193 A CN202010784193 A CN 202010784193A CN 111852054 B CN111852054 B CN 111852054B
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- Prior art keywords
- damping
- masonry wall
- seat
- wall
- shock absorption
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/24—Safety or protective measures preventing damage to building parts or finishing work during construction
- E04G21/26—Strutting means for wall parts; Supports or the like, e.g. for holding in position prefabricated walls
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
- F16F15/067—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs
Abstract
The invention discloses a masonry wall anti-seismic strengthening device, which relates to the technical field of building equipment and comprises a building ground and masonry walls, wherein guide rods are arranged at two ends of each masonry wall, telescopic springs are arranged on the surfaces of the guide rods, movable seats are arranged on the surfaces of the guide rods, supporting rods are connected above the movable seats, first mounting plates are arranged on two sides of each masonry wall, push rods are arranged at the bottom of each masonry wall and connected with rollers, shock absorption boxes are arranged on two sides of each masonry wall, first shock absorption springs are arranged in the shock absorption boxes and connected with shock absorption plates, the shock absorption plates are connected with shock absorption rods, the shock absorption rods are connected with arc shock absorption seats, the telescopic springs convert external acting force into elastic force and complete resetting, the first shock absorption springs convert the external acting force into elastic force and complete resetting, the second shock absorption springs convert the external acting force into elastic force and complete resetting, and buffer rods, the third shock absorption springs and the buffer plates are arranged to effectively improve the buffer effect between the masonry walls, avoid causing the incident because external acting force or earthquake lead to the brickwork wall to damage.
Description
Technical Field
The invention relates to the technical field of building equipment, in particular to a masonry wall earthquake-resistant reinforcing device.
Background
The masonry wall is a wall body built by building blocks and mortar, and can be used as a bearing wall and a surrounding wall of industrial and civil buildings. The concrete block is divided into small blocks, medium blocks and large block walls according to the size of the block. The material includes aerated concrete wall, silicate block wall, cement cinder hollow wall, limestone, etc.
Compared with the traditional reinforced concrete structure, the masonry wall of the rural clay brick masonry has poor anti-seismic performance and insufficient strength, and when an earthquake occurs, the bottom of the masonry wall can generate great shear force, so that a house collapses easily, the building structure is damaged, and great potential safety hazards are caused.
Disclosure of Invention
The invention aims to provide a masonry wall anti-seismic reinforcing device to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a masonry wall anti-seismic reinforcing device comprises a building ground and a masonry wall, wherein guide rods are symmetrically arranged at the left end and the right end of the masonry wall, a telescopic spring is arranged on the surface of each guide rod, a movable seat is arranged on the surface of each guide rod, the movable seat is slidably connected with the guide rods, the telescopic spring is fixedly connected with the movable seat, the left end and the right end of each movable seat are rotatably connected with a support rod, a first mounting plate is symmetrically arranged at the left side and the right side of the masonry wall, the tail end of one side, away from the movable seat, of each support rod is rotatably connected with a first mounting plate, push rods are symmetrically arranged at the left side and the right side of the bottom of the masonry wall, the tail end, away from the masonry wall, of each push rod is connected with a roller, shock absorption boxes are symmetrically arranged at the left side and the right side of the masonry wall, a first shock absorption spring is arranged in each shock absorption box, the shock absorption plates are fixedly connected with shock absorption rods, the tail end of one side of the shock absorption rod, which is far away from the shock absorption plate, penetrates through the shock absorption box to extend and be fixedly connected with the arc shock absorption seat, the roller is contacted with the surface of the arc-shaped shock absorption seat, the left side and the right side of the masonry wall are symmetrically provided with a limiting sleeve, the limiting sleeve is connected with a limiting rod, the left side wall and the right side wall of the masonry wall are symmetrically provided with a second mounting plate, the tail end of one side of the limiting rod, which is far away from the limiting sleeve, is fixedly connected with the second mounting plate, sliding grooves are symmetrically arranged on the left side and the right side of the damping ground, a second damping spring is arranged in the sliding groove, a sliding seat is arranged in the sliding groove and is connected with the sliding groove in a sliding way, the second damping spring is fixedly connected with the sliding seat, a buffer rod is arranged between the masonry walls on the left side and the right side, set up damping spring three in the brickwork wall, three fixed connection buffer boards of damping spring, the buffer beam left and right sides end respectively with buffer board fixed connection.
As a further scheme of the invention: a movable plate is arranged between the upper portion of the building ground and a masonry wall, and a reserved gap is formed between the movable plate and the building ground.
As a still further scheme of the invention: the building floor is internally provided with a limiting groove, the bottom of the arc-shaped shock absorption seat is connected with a limiting seat, the limiting seat is installed in the limiting groove, and the limiting seat is connected with the limiting groove in a sliding mode.
As a further scheme of the invention: the guide rod can dismantle fixed connection through the bolt with building ground, fixed connection can be dismantled through the bolt with the brickwork wall to mounting panel one, the surge tank can dismantle fixed connection through the bolt with building ground.
As a further scheme of the invention: and the second mounting plate is detachably and fixedly connected with the masonry wall through bolts.
As a further scheme of the invention: the utility model discloses a spacing pole, including gag lever post, spacing sleeve, gag lever post and spacing sleeve, gag lever post surface equidistance sets up the locating hole, the spacing sleeve surface sets up positioning screw, fixed connection can be dismantled through locating hole and positioning screw to gag lever post and spacing sleeve.
As a further scheme of the invention: the number of the buffer rods, the damping springs III and the buffer plates is not less than six.
Compared with the prior art, the invention has the beneficial effects that: a masonry wall anti-seismic strengthening device, when the masonry wall receives external acting force, the masonry wall pushes a movable seat to horizontally move on the surface of a guide rod through a support rod, the movable seat pushes a telescopic spring to stretch, the telescopic spring converts the external acting force into elastic force and completes reset, the damping effect is realized, the masonry wall extrudes an arc-shaped damping seat to horizontally move through a push rod and a roller, the arc-shaped damping seat extrudes a damping plate through a damping rod and the damping spring I moves in a damping box, the damping spring I converts the external acting force into the elastic force and completes the reset, the damping effect is realized, the masonry wall pushes a sliding seat to horizontally move in a sliding groove through a limiting rod and a limiting sleeve, the sliding seat extrudes a damping spring II to stretch, the external acting force is converted into the elastic force and completes the reset, by arranging a buffer rod, a damping spring III and a buffer plate, the buffer effect between the masonry walls is effectively improved, avoid causing the incident because external acting force or earthquake lead to the brickwork wall to damage.
Drawings
Fig. 1 is a schematic structural view of a masonry wall earthquake-resistant reinforcing device.
Fig. 2 is an enlarged schematic structural view of a masonry wall seismic strengthening device at a point a in fig. 1.
Fig. 3 is a schematic view of a structure of a limiting rod in a masonry wall anti-seismic reinforcing device.
Fig. 4 is a schematic structural view of masonry wall connection in the masonry wall earthquake-resistant reinforcing device.
In the figure: 1-building a ground; 2-damping spring II; 3-a slide seat; 4-a limiting sleeve; 5-positioning the screw rod; 6-a limiting rod; 7-positioning holes; 8, mounting a second plate; 9-masonry walls; 10-a movable plate; 11-a movable seat; 12-reserving gaps; 13-mounting the plate I; 14-a strut; 15-a guide rod; 16-a chute; 17-a push rod; 18-a shock-absorbing box; 19-a damping plate; 20-a damping spring; 21-a shock-absorbing rod; 22-a limiting groove; 23-a limiting seat; 24-a telescoping spring; 25-arc shock-absorbing seat; 26-a roller; 27-damping spring three; 28-a buffer rod; 29-buffer rod.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to specific embodiments.
Example 1
Referring to fig. 1-2, an earthquake-resistant reinforcing device for masonry wall comprises a building ground 1 and a masonry wall 9, in order to improve the damping effect of the masonry wall 9 located in the building ground 1, guide rods 15 are symmetrically arranged at the left and right ends of the masonry wall 9, extension springs 24 are arranged on the surfaces of the guide rods 15, movable seats 11 are arranged on the surfaces of the guide rods 15, the movable seats 11 are slidably connected with the guide rods 15, the extension springs 24 are fixedly connected with movable seats 11, support rods 14 are rotatably connected above the movable seats 11 at the left and right sides, mounting plates 13 are symmetrically arranged at the left and right sides of the masonry wall 9, the ends of the support rods 14 far away from the movable seats 11 are rotatably connected with the mounting plates 13, when the masonry wall 9 is subjected to external acting force, the masonry wall 9 pushes the movable seats 11 to horizontally move on the surfaces of the guide rods 15 through the support rods 14, the movable seats 11 push the extension springs 24 to extend and retract, the telescopic springs 24 convert external acting force into elastic force and complete reset, so that a damping effect is realized, in order to improve the damping effect, push rods 17 are symmetrically arranged on the left side and the right side of the bottom of the masonry wall 9, the end, far away from the masonry wall 9, of one side of each push rod 17 is connected with a roller 26, damping boxes 18 are symmetrically arranged on the left side and the right side of the masonry wall 9, damping springs 20 are arranged in the damping boxes 18, the damping springs 20 are fixedly connected with damping plates 19, the damping plates 19 are slidably connected with the damping boxes 18, one side, far away from the damping springs 20, of each damping plate 19, one end, far away from the damping plates 19, of each damping rods 21 penetrates through the damping boxes 18 to extend and fixedly connect arc-shaped damping seats 25, the rollers 26 are in surface contact with the arc-shaped damping seats 25, when the masonry wall 9 is subjected to the external acting force, the masonry wall 9 extrudes the arc-shaped damping seats 25 to move in the horizontal direction through the push rods 17 and the rollers 26, the arc-shaped shock absorption seat 25 extrudes the shock absorption plate 19 and the first shock absorption spring 20 through the shock absorption rod 21 to move in the shock absorption box 18, and the first shock absorption spring 20 converts external acting force into elastic force and completes resetting to realize a shock absorption effect.
Further, in order to improve the damping effect on the masonry wall 9, in this embodiment, a movable plate 10 is disposed between the upper side of the building ground 1 and the masonry wall 9, and a reserved gap 12 is disposed between the movable plate 10 and the building ground 1.
Further, in order to improve the stability of the shock absorption seat 25 moving left and right in the horizontal direction, in this embodiment, a limiting groove 22 is provided in the building ground 1, the bottom of the arc shock absorption seat 25 is connected with a limiting seat 23, the limiting seat 23 is installed in the limiting groove 22, and the limiting seat 23 is slidably connected with the limiting groove 22.
Further, in order to facilitate the detachment and the maintenance, in this embodiment, the guide rod 15 and the building ground 1 are detachably and fixedly connected through a bolt, the mounting plate 13 and the masonry wall 9 are detachably and fixedly connected through a bolt, and the damper box 18 and the building ground 1 are detachably and fixedly connected through a bolt.
Example 2
Referring to fig. 1-4, on the basis of embodiment 1, in order to improve the damping effect of a masonry wall 9 located above a building floor 1, limiting sleeves 4 are symmetrically arranged on the left and right sides of the masonry wall 9, the limiting sleeves 4 are connected with limiting rods 6, mounting plates two 8 are symmetrically arranged on the left and right sides of the masonry wall 9, the end, away from the limiting sleeves 4, of one side of the limiting rods 6 is fixedly connected with the mounting plates two 8, sliding grooves 16 are symmetrically arranged on the left and right sides of the damping floor 1, damping springs two 2 are arranged in the sliding grooves 16, sliding seats 3 are arranged in the sliding grooves 16, the sliding seats 3 are slidably connected with the sliding grooves 16, the damping springs two 2 are fixedly connected with the sliding seats 3, when the masonry wall 9 receives an external acting force, the masonry wall 9 pushes the sliding seats 3 to horizontally move in the sliding grooves 16 through the limiting rods 6 and the limiting sleeves 4, and the sliding seats 3 extrude the damping springs two 2 to stretch, damping spring two 2 turns into the elastic force with external force and accomplishes and reset, in order to improve the buffering effect of connecting between brickwork wall 9, the left and right sides set up buffer beam 28 between brickwork wall 9, set up three 27 of damping spring in the brickwork wall 9, three 27 fixed connection buffer boards 29 of damping spring, the end of 28 left and right sides of buffer beam respectively with buffer board 29 fixed connection, through setting up buffer beam 28, three 27 of damping spring and buffer board 29, effectively improve the buffering effect between brickwork wall 9.
Further, in order to facilitate the detachment of the second mounting plate 8, in this embodiment, the second mounting plate 8 and the masonry wall 9 are detachably and fixedly connected through bolts.
Further, for the convenience of adjusting the length of gag lever post 6, in this embodiment, 6 surperficial equidistance of gag lever post set up locating hole 7, 4 surfaces of spacing sleeve set up positioning screw 5, fixed connection can be dismantled through locating hole 7 and positioning screw 5 to gag lever post 6 and spacing sleeve 4.
Further, in order to improve the buffering effect between the masonry walls 9, in this embodiment, the number of the buffering rods 28, the damping springs three 27 and the buffering plates 29 is not less than six.
The working principle of the invention is as follows: a masonry wall anti-seismic strengthening device is disclosed, when masonry wall 9 receives external acting force, masonry wall 9 pushes a movable seat 11 to horizontally move on the surface of a guide rod 15 through a support rod 14, movable seat 11 pushes a telescopic spring 24 to stretch, telescopic spring 24 converts the external acting force into elastic force and completes resetting, a damping effect is realized, masonry wall 9 extrudes an arc-shaped damping seat 25 to move in the horizontal direction through a push rod 17 and a roller 26, arc-shaped damping seat 25 extrudes a damping plate 19 and a damping spring 20 to move in a damping box 18 through a damping rod 21, damping spring 20 converts the external acting force into elastic force and completes resetting, the damping effect is realized, masonry wall 9 pushes a sliding seat 3 to horizontally move in a sliding groove 16 through a limiting rod 6 and a limiting sleeve 4, sliding seat 3 extrudes a damping spring 2 to stretch, the damping spring 2 converts the external acting force into elastic force and completes resetting, through setting up buffer beam 28, damping spring three 27 and buffer board 29, improve the buffering effect between brickwork wall 9.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (5)
1. The utility model provides a device is strengthened to brickwork wall antidetonation, includes building ground (1) and brickwork wall (9), its characterized in that, brickwork wall (9) left and right sides both ends symmetry sets up guide arm (15), guide arm (15) surface sets up expanding spring (24), guide arm (15) surface sets up sliding seat (11), sliding seat (11) and guide arm (15) sliding connection, expanding spring (24) and sliding seat (11) fixed connection, the left and right sides sliding seat (11) top is rotated and is connected branch (14), brickwork wall (9) left and right sides symmetry sets up mounting panel (13), one side end that movable seat (11) were kept away from in branch (14) rotates with mounting panel (13) to be connected, brickwork wall (9) bottom left and right sides symmetry sets up push rod (17), one side end that brickwork wall (9) were kept away from in push rod (17) is connected with gyro wheel (26), the damping box (18) is symmetrically arranged on the left side and the right side of the masonry wall (9), a first damping spring (20) is arranged in the damping box (18), a first damping spring (20) is fixedly connected with a damping plate (19), the damping plate (19) is in sliding connection with the damping box (18), one side of the damping plate (19) far away from the first damping spring (20) is fixedly connected with a damping rod (21), one side end of the damping rod (21) far away from the damping plate (19) penetrates through the damping box (18) to extend and fixedly connect an arc damping seat (25), the roller (26) is in surface contact with the arc damping seat (25), the limiting sleeve (4) is symmetrically arranged on the left side and the right side of the masonry wall (9), the limiting sleeve (6) is connected with the limiting sleeve (6), the mounting plate two (8) is symmetrically arranged on the left side and the right side of the masonry wall (9), one side end of the limiting sleeve (4) far away from the limiting rod (6) is fixedly connected with the mounting plate two (8), the building floor is characterized in that sliding grooves (16) are symmetrically formed in the left side and the right side of the building floor (1), a second damping spring (2) is arranged in each sliding groove (16), a sliding seat (3) is arranged in each sliding groove (16), each sliding seat (3) is connected with the corresponding second damping spring (2) in a sliding mode, the corresponding second damping springs (2) are fixedly connected with the corresponding sliding seats (3), a buffer rod (28) is arranged between the masonry walls (9) on the left side and the right side, a third damping spring (27) is arranged in each masonry wall (9), the corresponding third damping spring (27) is fixedly connected with a buffer plate (29), and the tail ends of the left side and the right side of each buffer rod (28) are fixedly connected with the corresponding buffer plate (29);
a movable plate (10) is arranged between the upper part of the building ground (1) and the masonry wall (9), and a reserved gap (12) is arranged between the movable plate (10) and the building ground (1);
set up spacing groove (22) in building ground (1), spacing seat (23) are connected to shock attenuation seat (25) bottom, install in spacing groove (22) spacing seat (23), spacing seat (23) and spacing groove (22) sliding connection.
2. A masonry wall earthquake-resistant strengthening device according to claim 1, characterized in that the guide rod (15) is detachably and fixedly connected with the building ground (1) through a bolt, the first mounting plate (13) is detachably and fixedly connected with the masonry wall (9) through a bolt, and the shock absorption box (18) is detachably and fixedly connected with the building ground (1) through a bolt.
3. The masonry wall earthquake-resistant strengthening device as claimed in claim 1, wherein the second mounting plate (8) is detachably and fixedly connected with the masonry wall (9) through bolts.
4. The masonry wall earthquake-resistant reinforcing device according to claim 1, wherein the surface of the limiting rod (6) is provided with positioning holes (7) at equal intervals, the surface of the limiting sleeve (4) is provided with positioning screws (5), and the limiting rod (6) and the limiting sleeve (4) are detachably and fixedly connected through the positioning holes (7) and the positioning screws (5).
5. Masonry wall earthquake-resistant reinforcement arrangement according to claim 1, characterised in that the number of said buffer rods (28), shock-absorbing springs three (27) and buffer plates (29) is not less than six.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010784193.XA CN111852054B (en) | 2020-08-06 | 2020-08-06 | Masonry wall antidetonation is strengthened device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010784193.XA CN111852054B (en) | 2020-08-06 | 2020-08-06 | Masonry wall antidetonation is strengthened device |
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| Publication Number | Publication Date |
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| CN111852054A CN111852054A (en) | 2020-10-30 |
| CN111852054B true CN111852054B (en) | 2022-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010784193.XA Active CN111852054B (en) | 2020-08-06 | 2020-08-06 | Masonry wall antidetonation is strengthened device |
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| CN112267620A (en) * | 2020-11-06 | 2021-01-26 | 山东新双新型建材有限公司 | High-strength super-flexible large-width top plate |
| CN112460199B (en) * | 2020-11-09 | 2022-03-18 | 浙江龙潇医疗科技有限公司 | Buffer mechanism in mask belt tensioning device |
| CN112854819A (en) * | 2021-01-14 | 2021-05-28 | 吉安创星空间科技有限公司 | Foldable convenient building steel construction of dismantling |
| CN114607168B (en) * | 2022-03-16 | 2023-11-14 | 安徽中擎建设发展有限公司 | Earthquake-resistant reinforcing structure of multilayer masonry |
| CN115807498B (en) * | 2022-12-13 | 2023-12-08 | 苏州达康建筑科技有限公司 | Masonry structure shock attenuation strengthening equipment |
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| WO1997025497A1 (en) * | 1996-01-09 | 1997-07-17 | Freyssinet International (Stup) | Damping device for elements of a civil engineering construction |
| CN107795634A (en) * | 2017-11-16 | 2018-03-13 | 江苏丰禾食品有限公司 | A kind of electromechanical equipment damping device for being used to build |
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| CN208918293U (en) * | 2018-07-16 | 2019-05-31 | 臧国良 | A kind of civil engineering structure supporting frame with steel structure |
| CN210177732U (en) * | 2019-04-30 | 2020-03-24 | 上海时代建筑设计有限公司 | Assembled building shock-absorbing structure |
| CN210563670U (en) * | 2019-08-16 | 2020-05-19 | 广州凌鼎建筑工程有限公司 | House earthquake-resistant structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997025497A1 (en) * | 1996-01-09 | 1997-07-17 | Freyssinet International (Stup) | Damping device for elements of a civil engineering construction |
| CN207248198U (en) * | 2017-09-26 | 2018-04-17 | 常州市东升检测仪器有限公司 | A kind of hot metal detector protective device |
| CN107795634A (en) * | 2017-11-16 | 2018-03-13 | 江苏丰禾食品有限公司 | A kind of electromechanical equipment damping device for being used to build |
| CN208918293U (en) * | 2018-07-16 | 2019-05-31 | 臧国良 | A kind of civil engineering structure supporting frame with steel structure |
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| CN111852054A (en) | 2020-10-30 |
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