CN111155659B - Connection node and crack identification method - Google Patents
Connection node and crack identification method Download PDFInfo
- Publication number
- CN111155659B CN111155659B CN202010074586.1A CN202010074586A CN111155659B CN 111155659 B CN111155659 B CN 111155659B CN 202010074586 A CN202010074586 A CN 202010074586A CN 111155659 B CN111155659 B CN 111155659B
- Authority
- CN
- China
- Prior art keywords
- connecting plate
- node
- beam column
- plate
- holes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C13/00—Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds
- E01C13/10—Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds for artificial surfaces for outdoor or indoor practice of snow or ice sports
- E01C13/12—Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds for artificial surfaces for outdoor or indoor practice of snow or ice sports for snow sports, e.g. skiing or ski tow track
-
- 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
- E04H3/00—Buildings or groups of buildings for public or similar purposes; Institutions, e.g. infirmaries or prisons
- E04H3/10—Buildings or groups of buildings for public or similar purposes; Institutions, e.g. infirmaries or prisons for meetings, entertainments, or sports
- E04H3/22—Theatres; Concert halls; Studios for broadcasting, cinematography, television or similar purposes
- E04H3/24—Constructional features of stages
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/11—Region-based segmentation
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Computer Vision & Pattern Recognition (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electromagnetism (AREA)
- Multimedia (AREA)
- Quality & Reliability (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The application belongs to the technical field of public safety, and particularly relates to a connection node and a crack identification method. The traditional visual identification has strong randomness and limitation, and can not quickly and accurately identify the node crack to eliminate the potential crack and the propagation. The application provides a connected node, including first beam column, second beam column and the stand that connects gradually, first beam column with the stand is connected, be provided with the signpost on the stand. The node has the advantages that the node meets the structural function requirements and changes the inclination angle, can be used for an temporary stage and an temporary ski trail, achieves the universality of the node, and avoids the problems of uneven contact stress between a beam and a node inclined plane and node crack expansion.
Description
Technical Field
The application belongs to the technical field of public safety, and particularly relates to a connection node and a crack identification method.
Background
Recreational sports facilities such as temporary stages and temporary ski resorts are mostly composed of detachable members through connecting nodes, and have the advantages of convenient assembly and disassembly, repeated use and the like. At present, the bearing structure of panels such as interim stage substructure and interim skiing way adopts traditional building templates to support the support body to build and form, but the crowd load characteristic of the stage beauty who bears or the skiing crowd of skiing way obviously is different from concrete floor load, and the support body is accident frequently in the application, the security problem that needs to solve interim recreational civilian facility urgently.
The 'strong node weak member' in the traditional structural design requires that the node has higher safety redundancy, but in the temporary structure, because of the detachability of the node, the resistance performance of the node is greatly reduced. Particularly, the traditional flat-top adjustable support is still adopted at the joint of the temporary ski run supporting panel, and because the ski run is in a slope form, the contact surface between the top of the support and the panel beam is very small, and the serious eccentric phenomenon of stress concentration exists, so that great potential safety hazards exist in the joint and the structure. Moreover, the node is a stress intersection and transfer area between the rod pieces, cracks are easy to appear in the repeated use process, and when the cracks are accumulated and expanded to a certain degree, the function of the node can be disabled.
The traditional visual identification has strong randomness and limitation, and can not quickly and accurately identify the node crack to eliminate the potential crack and the propagation.
Disclosure of Invention
1. Technical problem to be solved
Based on the problems that the traditional naked eye identification has strong randomness and limitation and can not quickly and accurately identify the node cracks to eliminate potential cracks and expansion, the application provides a connection node and a crack identification method.
2. Technical scheme
In order to reach foretell purpose, this application provides a connected node, including first beam column, second beam column and the stand that connects gradually, first beam column with the stand is connected, be provided with the sign board on the stand.
Another embodiment provided by the present application is: the first beam column, the second beam column with the stand passes through the connecting plate subassembly to be connected, the connecting plate subassembly includes first connecting plate, second connecting plate and third connecting plate, first connecting plate the second connecting plate with third connecting plate fixed connection, first beam column with first connecting plate is connected, the second beam column with the second connecting plate is connected, the stand with the third connecting plate is connected, the sign board set up in on the third connecting plate.
Another embodiment provided by the present application is: the first connecting plate is provided with a plurality of first connecting holes, the first beam column passes through the first connecting holes and is connected with the first connecting plate, the second connecting plate is provided with a plurality of second connecting holes, the second beam column passes through the second connecting holes and is connected with the second connecting plate, the third connecting plate is provided with a plurality of third connecting holes, and the stand passes through the third connecting holes and is movably connected with the third connecting plate.
Another embodiment provided by the present application is: the third connecting hole is long-strip-shaped or round, and the upright post and the third connecting plate can rotate relatively.
Another embodiment provided by the present application is: the connecting plate component is a cross-shaped plate.
Another embodiment provided by the present application is: the first beam column is a longitudinal beam, the cross section of the longitudinal beam is a groove shape, the second beam column is a cross beam, and the cross section of the cross beam is a groove shape.
Another embodiment provided by the present application is: the first connecting holes are bolt holes, and the number of the first connecting holes is 4; the second connecting hole is a bolt hole, and the number of the second connecting holes is 4.
Another embodiment provided by the present application is: the third connecting hole includes bolt hole and sliding hole, the bolt hole is 1, sliding hole is 4.
The application also provides a crack identification method, which comprises the following steps:
1) after preprocessing the image collected by the marking plate, searching the artificial marking point in the image, and obtaining the central pixel coordinate of the marking point, thereby corresponding to the given world coordinate one by one;
2) positioning the target area according to the determined node size, calculating the pixel coordinates of the target area, and then segmenting the area to obtain the specific position of the target area;
3) and after the target area is subjected to seed point identification, growing the seed points to obtain the cracks of the node target area.
Another embodiment provided by the present application is: the preprocessing in the step 1) comprises graying and filtering the image.
3. Advantageous effects
Compared with the prior art, the connection node and crack identification method provided by the application have the beneficial effects that:
the application of the connection node provided by the application is based on crack recognition technology and the connection node with the adjustable inclination angle in the temporary stage plane board and the temporary ski run inclined plane board supporting system.
The application provides a connected node has the node of adjustable inclination function to combine crackle identification technique, with strengthening node commonality and security, will have good market economic prospect and benefit.
The application provides a connected node has the node that satisfies the structure function demand in order to change inclination, can be used for interim stage also can be used for interim ski resort, realizes the commonality of node, avoids roof beam and node inclined plane contact atress inhomogeneous and node crack expansion problem.
The utility model provides a connected node indulges transverse connection member and is in the coplanar, can avoid the panel to have the unstable factor that main, secondary beam overlap joint caused.
The application provides a connected node, vertical connecting column has different rotation angle's connected mode through the node, can realize that the panel supporting beam is even with the node atress on different inclined planes, has avoided node stress concentration and eccentric problem, has improved the integrality and the commonality of node atress.
The application provides a connected node, node and component adopt bolted connection, have solved the slip problem that traditional node overlap joint exists, have improved connected node rigidity, have strengthened structural integrity.
The crack identification method based on image processing solves the problem that crack detection is influenced by the quality of workers, and can provide an efficient identification method and precision for predicting cracks and controlling crack propagation.
Drawings
FIG. 1 is a schematic diagram of a connection node structure of the present application;
FIG. 2 is a schematic structural view of a connector plate assembly of the present application;
FIG. 3 is a schematic diagram of a connection node of the present application;
fig. 4 is a schematic diagram illustrating the principle of the crack identification method of the present application.
In the figure: 1-a first beam column, 2-a second beam column, 3-an upright column, 4-a sign plate, 5-a connecting plate component, 6-a first connecting plate, 7-a second connecting plate, 8-a third connecting plate, 9-a first connecting hole, 10-a second connecting hole and 11-a third connecting hole.
Detailed Description
Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings, and it will be apparent to those skilled in the art from this detailed description that the present application can be practiced. Features from different embodiments may be combined to yield new embodiments, or certain features may be substituted for certain embodiments to yield yet further preferred embodiments, without departing from the principles of the present application.
Referring to fig. 1-4, the application provides a connected node, including first beam column 1, second beam column 2 and the stand 3 that connects gradually, first beam column 1 with stand 3 is connected, be provided with sign board 4 on the stand 1.
The number of the sign boards 4 may be one or more, and may be set according to specific requirements.
Further, first beam column 1 second beam column 2 with stand 3 passes through connecting plate subassembly 5 and connects, connecting plate subassembly 5 includes first connecting plate 6, second connecting plate 7 and third connecting plate 8, first connecting plate 6 second connecting plate 7 with third connecting plate 8 fixed connection, first beam column 1 with first connecting plate 6 is connected, second beam column 2 with second connecting plate 7 is connected, stand 3 with third connecting plate 8 is connected, sign board 4 set up in on the third connecting plate 8.
Further, be provided with a plurality of first connecting holes 9 on the first connecting plate 6, first beam column 1 passes through first connecting hole 9 with first connecting plate 6 is connected, be provided with a plurality of second connecting holes 10 on the second connecting plate 7, second beam column 2 passes through second connecting hole 10 with second connecting plate 7 is connected, be provided with a plurality of third connecting holes 11 on the third connecting plate 8, stand 3 passes through third connecting hole 11 with 8 swing joint of third connecting plate.
Further, the third connecting hole 11 is long-strip-shaped or circular, and the upright column 3 and the third connecting plate 8 can rotate relatively.
Further, the connecting plate assembly 5 is a cross-shaped plate.
Further, the first beam column 1 is a longitudinal beam, the cross section of the longitudinal beam is in a groove shape, the second beam column 2 is a cross beam, and the cross section of the cross beam is in a groove shape.
The connecting joint is formed by performing laser cutting and cold bending on a plurality of steel galvanized plates in advance to form different modules and then welding the modules according to the positions of the components. Connecting plate subassembly 5 is the important part of node, at first form the cross shaped plate through laser cutting, then with both sides protrusion board machinery clod wash, form third connecting plate 8 and be the stand connecting plate, then stand 3 is pegged graft in third connecting plate 8, and the bolt hole of predetermineeing at the both sides connecting plate passes through the bolt and is connected with stand 3, be different from one-way bolt hole fixed stand, this connecting node except setting up 5 bolt holes, wherein 1 bolt hole in middle part, it respectively has 2 bolt holes to correspond from top to bottom, in addition in order to realize the function of the adjustable inclination of connecting node, use the middle part bolt hole as the rotation axis, different inclination has been set for respectively, and corresponding bolt hole of seting up in upper and lower both sides. First beam column 1 is the module that the longeron just has the plate of certain length and thickness and forms for cell type (U type) cross-section, and the plate is fixed in stand connecting plate top through welded fastening, has the bolt hole on the cell type vertical panel to make things convenient for plate and longeron to be connected. The second beam column 2, namely the beam connecting point, is also in a groove-shaped cross section, the module is formed by welding three plates and finally welded with the first connecting plate 6, namely the longitudinal beam connecting plate and the lateral plate of the upright post connecting plate, and bolt holes are reserved in vertical plates on two sides so as to be connected with the beam.
Further, the first connection holes 9 are bolt holes, and the number of the first connection holes 9 is 4; the second connecting holes 10 are bolt holes, and the number of the second connecting holes 10 is 4.
Further, the third connecting hole 11 includes 1 bolt hole and 4 sliding holes.
The application also provides a crack identification method, which comprises the following steps:
1) after preprocessing the image collected by the marking plate, searching the artificial marking point in the image, and obtaining the central pixel coordinate of the marking point, thereby corresponding to the given world coordinate one by one;
2) positioning the target area according to the determined node size, calculating the pixel coordinates of the target area, and then segmenting the area to obtain the specific position of the target area;
3) and after the target area is subjected to seed point identification, growing the seed points to obtain the cracks of the node target area.
Specifically, the method comprises the following steps: the image preprocessing is mainly used for carrying out graying, filtering and other processing on the node image, then searching the artificial mark points in the image, and obtaining the central pixel coordinates of the mark points, so as to correspond to the given world coordinates one by one. And positioning the target area mainly according to the determined node size, calculating the pixel coordinates of the target area after obtaining the external parameter matrix of the camera, and then segmenting the area according to an image segmentation algorithm to obtain the specific position of the target area. The crack detection part mainly comprises the steps of identifying seed points of a target area, judging the seed points, eliminating false seed points, and finally growing the seed points to obtain cracks of the node target area. Because the artificial mark point with known size is preset in the stress key area of the node, the size of the crack can be determined only by a single image. Wherein the key stress area of the node is a multi-directional bolt hole area connected with the upright post. Therefore, image recognition points are arranged on the lateral plate surface of the upright post node and away from the two sides of the central bolt hole.
Further, the preprocessing in the step 1) includes graying and filtering the image.
Examples
The tiltable angle connection node based on the crack identification technology in the embodiment comprises a longitudinal beam connection node, a transverse beam connection node, a stand column connection node and crack detection.
The tiltable angle connecting node is shown in fig. 1 and 2, and can realize that the longitudinal beam and the upright post are connected through bolts, and the concrete connecting method is as follows. First beam column 1 is the longeron and is the rectangular pipe of 30mm x 50mm x 4mm in cross-section, through pegging graft to connected node both sides 4mm riser 401 department, then pass through M12 bolt and longeron with the bolt hole 404 phi 12 of reserving on the gusset plate, wherein bolt hole apart from the board outside distance 30mm, from top to bottom centrally, the position that the hole was seted up to same longeron 1 tip is the same, be different from circular bolt hole, installation error for adjusting the machining error and bringing, in order to facilitate the installation, set up oval hole on the longeron, wherein each extension 1mm about the aperture. The second beam column 2, namely the cross beam, is a rectangular pipe with the cross section of 50mm multiplied by 70mm multiplied by 4mm, and is connected to the 4mm vertical plate 402 on the two sides of the connecting node through insertion, and then is connected with the longitudinal beam through an M12 bolt with a bolt hole 405 phi 12 reserved on the node plate, wherein the distance between the bolt hole and the outer side of the plate is 25mm, the upper part and the lower part are centered, and an oval hole is formed at the corresponding position at the end part of the cross beam. The upright post 3 is a rectangular pipe with the section of 50mm multiplied by 70mm multiplied by 4mm, and is connected to 4mm vertical plates 403 at two sides of a connecting node in an inserting way, and then is connected with a reserved bolt hole 406 phi 12 on a node plate through an M12 bolt, wherein the bolt holes on the node plate can be divided into 4 types according to the using function, firstly, when the inclination angle is 0 degree, a node bolt hole formed by 5 bolt holes (two in the upper and lower directions and one in the middle) limits the upright post to be in a vertical state, and at the moment, the node is generally applied to a temporary stage panel with a flat surface and a snow field top platform sliding prepared area plane plate; secondly, when the inclination angle is 7 degrees, the middle one of the 5 bolt holes is taken as a rotating shaft, and the middle one is rotated by 7 degrees to form another 4 bolt holes, and at the moment, the node state is generally applied to the primary snow path panel; according to the same rotation principle, the node can also rotate by two angles of 17 degrees and 27 degrees so as to be applied to middle-level and high-level snow road panels, the spatial positions of the reserved 5 bolt holes only correspond to 0 degree for the end part of the upright post, the upright post is always vertical after the adjustment rotation, the node can be positioned according to the angle holes, and as shown in fig. 3, after the adjustment angle of the node is 7 degrees, the longitudinal beam and the node are fixed together through bolts.
The node crack identification is an identification algorithm based on image processing, and the specific identification process is as follows: firstly, another calibration plate which is the same as the calibration plate used on the node is used as a template, and a binocular stereo camera is adopted to calibrate the camera according to the calibration plate so as to obtain the internal parameters of the camera. Then, the node area containing the marking plate 5 is photographed in an artificial photographing or unmanned aerial vehicle high-altitude operation mode, and the acquired node image is transmitted to the processing equipment. And then graying and filtering the node image, identifying the artificial mark points, acquiring external parameters of the camera, positioning the target area, and segmenting the area according to an image segmentation algorithm to obtain the specific position of the target area. For the crack generation part, the gray value of the image can generate mutation, the whole crack can be extracted by carrying out seed point identification and seed point growth according to the specific gray value and the change direction, the pixel coordinate is reduced to the world coordinate according to the internal and external parameters of the camera, and the size of the crack is obtained, and a flow chart is shown in fig. 4.
According to the rod connecting joint based on the crack identification technology, the inclination angle of the beam can be adjusted through the joint, so that the stress uniformity can be ensured, the problems of concentrated stress and eccentricity of the joint of the inclined section are solved, and the universality of the joint is improved; by combining a non-contact method of an image and identifying and acquiring the node cracks through the mark points, the crack identification efficiency and the identification precision are improved, reference can be provided for crack occurrence and expansion, and the safety of the node is improved.
Although the present application has been described above with reference to specific embodiments, those skilled in the art will recognize that many changes may be made in the configuration and details of the present application within the principles and scope of the present application. The scope of protection of the application is determined by the appended claims, and all changes that come within the meaning and range of equivalency of the technical features are intended to be embraced therein.
Claims (8)
1. A connecting node, characterized by: the beam column comprises a first beam column, a second beam column and an upright column which are sequentially connected, wherein the first beam column is connected with the upright column, and the upright column is provided with a mark plate; the first beam column and the second beam column are connected with the upright column through a connecting plate assembly, the connecting plate assembly comprises a first connecting plate, a second connecting plate and a third connecting plate, the first connecting plate, the second connecting plate and the third connecting plate are fixedly connected, the first beam column is connected with the first connecting plate, the second beam column is connected with the second connecting plate, the upright column is connected with the third connecting plate, and the mark plate is arranged on the third connecting plate; the first connecting plate is provided with a plurality of first connecting holes, the first beam column passes through the first connecting holes and is connected with the first connecting plate, the second connecting plate is provided with a plurality of second connecting holes, the second beam column passes through the second connecting holes and is connected with the second connecting plate, the third connecting plate is provided with a plurality of third connecting holes, and the stand passes through the third connecting holes and is movably connected with the third connecting plate.
2. The connection node of claim 1, wherein: the third connecting hole is long-strip-shaped or round, and the upright post and the third connecting plate can rotate relatively.
3. The connection node of claim 1, wherein: the connecting plate component is a cross-shaped plate.
4. The connection node of claim 1, wherein: the first beam column is a longitudinal beam, the cross section of the longitudinal beam is a groove shape, the second beam column is a cross beam, and the cross section of the cross beam is a groove shape.
5. The connection node of claim 1, wherein: the first connecting holes are bolt holes, and the number of the first connecting holes is 4; the second connecting hole is a bolt hole, and the number of the second connecting holes is 4.
6. The connection node of claim 1, wherein: the third connecting hole includes bolt hole and sliding hole, the bolt hole is 1, sliding hole is 4.
7. A method for crack identification of a connection node according to any of claims 1-6, characterized by: the method comprises the following steps:
1) after preprocessing the image collected by the marking plate, searching the artificial marking point in the image, and obtaining the central pixel coordinate of the marking point, thereby corresponding to the given world coordinate one by one;
2) positioning the target area according to the determined node size, calculating the pixel coordinates of the target area, and then segmenting the area to obtain the specific position of the target area;
3) and after the target area is subjected to seed point identification, growing the seed points to obtain the cracks of the node target area.
8. The method of claim 7, wherein: the preprocessing in the step 1) comprises graying and filtering the image.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010074586.1A CN111155659B (en) | 2020-01-22 | 2020-01-22 | Connection node and crack identification method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010074586.1A CN111155659B (en) | 2020-01-22 | 2020-01-22 | Connection node and crack identification method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111155659A CN111155659A (en) | 2020-05-15 |
| CN111155659B true CN111155659B (en) | 2022-02-18 |
Family
ID=70565126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010074586.1A Active CN111155659B (en) | 2020-01-22 | 2020-01-22 | Connection node and crack identification method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111155659B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112177167A (en) * | 2020-10-09 | 2021-01-05 | 江苏跃界装配式建筑科技有限公司 | Assembling and connecting method of ALC (autoclaved lightweight concrete) wallboard and wood structure main body |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004324312A (en) * | 2003-04-25 | 2004-11-18 | Hamahiro Kogyo:Kk | Structural member connecting hardware for roof unit |
| CN202073183U (en) * | 2011-05-16 | 2011-12-14 | 广东保威新能源有限公司 | Adjustable adaptor |
| CN104034733A (en) * | 2014-07-02 | 2014-09-10 | 中国人民解放军国防科学技术大学 | Service life prediction method based on binocular vision monitoring and surface crack image recognition |
| CN208267122U (en) * | 2018-03-28 | 2018-12-21 | 南京林业大学 | The hinged and rigid switching device of connecting node between a kind of metal rod |
| CN109146871A (en) * | 2018-08-31 | 2019-01-04 | 珠海格力智能装备有限公司 | The recognition methods of crackle and device |
| CN109829948A (en) * | 2018-12-13 | 2019-05-31 | 昂纳自动化技术（深圳）有限公司 | Camera calibration plate, calibration method and camera |
| CN208934115U (en) * | 2018-01-16 | 2019-06-04 | 河南金安泰钢结构工程有限公司 | A kind of articulated structure of steel structure node |
| CN110565813A (en) * | 2019-08-29 | 2019-12-13 | 郑州大学 | Wood structure building column plate connecting structure |
-
2020
- 2020-01-22 CN CN202010074586.1A patent/CN111155659B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004324312A (en) * | 2003-04-25 | 2004-11-18 | Hamahiro Kogyo:Kk | Structural member connecting hardware for roof unit |
| CN202073183U (en) * | 2011-05-16 | 2011-12-14 | 广东保威新能源有限公司 | Adjustable adaptor |
| CN104034733A (en) * | 2014-07-02 | 2014-09-10 | 中国人民解放军国防科学技术大学 | Service life prediction method based on binocular vision monitoring and surface crack image recognition |
| CN208934115U (en) * | 2018-01-16 | 2019-06-04 | 河南金安泰钢结构工程有限公司 | A kind of articulated structure of steel structure node |
| CN208267122U (en) * | 2018-03-28 | 2018-12-21 | 南京林业大学 | The hinged and rigid switching device of connecting node between a kind of metal rod |
| CN109146871A (en) * | 2018-08-31 | 2019-01-04 | 珠海格力智能装备有限公司 | The recognition methods of crackle and device |
| CN109829948A (en) * | 2018-12-13 | 2019-05-31 | 昂纳自动化技术（深圳）有限公司 | Camera calibration plate, calibration method and camera |
| CN110565813A (en) * | 2019-08-29 | 2019-12-13 | 郑州大学 | Wood structure building column plate connecting structure |
Non-Patent Citations (2)
| Title |
|---|
| 周玉县、郑善喜、黄晓锋、徐清清.基于区域生长法的建筑裂缝定量分析方法.《低温建筑技术》.2017,第39卷(第10期),158-160. * |
| 基于区域生长法的建筑裂缝定量分析方法;周玉县、郑善喜、黄晓锋、徐清清;《低温建筑技术》;20171031;第39卷(第10期);158-160 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111155659A (en) | 2020-05-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Lovegrove et al. | A new 500 m2 paraboloidal dish solar concentrator | |
| US8203110B2 (en) | Dual axle solar tracker | |
| EP1903155B1 (en) | Movable support armature for a curved reflector | |
| CN109959343B (en) | Device and method for monitoring deformation of super high-rise building by using laser | |
| CN111155659B (en) | Connection node and crack identification method | |
| CN103938720B (en) | The construction method of the large space metal ball crown net shell of equipment accumulating | |
| CN109505266B (en) | On-site horizontal splicing method for steel pipe arch | |
| CN111188272A (en) | Multi-formwork assembly steel box girder construction auxiliary device and construction method thereof | |
| CN114332402B (en) | Steel bridge simulation pre-assembly method integrating ground type and hand-held laser scanning | |
| CN108253925A (en) | A kind of tunnel deformation monitoring method, equipment and storage device based on cloud section | |
| CN205296489U (en) | Superelevation light gauge steel fire compartment wall construction structures | |
| CN110241735B (en) | Positioning and adjusting device and method for main tower cable guide pipe of cable-stayed bridge | |
| CN211597285U (en) | Hyperbolic metal sheet unit curtain wall construction | |
| CN205029606U (en) | Support is trailed to photovoltaic unipolar | |
| CN214134714U (en) | Anti-deformation overturning welding equipment for special-shaped steel box girder bridge deck | |
| CN116149349A (en) | Flight path planning method for automatic inspection of ultra-high arch dam unmanned aerial vehicle | |
| CN210216152U (en) | Stride pier seam template structure is striden to sitting posture single track limit | |
| CN208294128U (en) | A kind of variable-angle adjustable type bearing diagonal | |
| CN211818113U (en) | Steel structure supporting system of flying ladder | |
| CN210164485U (en) | Steel frame joint suitable for large-deformation highway tunnel | |
| CN218183284U (en) | Photovoltaic support for oil-water well site | |
| CN110024592B (en) | Method for installing multi-span greenhouse | |
| CN205917919U (en) | Light steel filler wall of steel frame system | |
| CN117662222A (en) | Hydraulic support pin shaft hole alignment guiding method based on depth vision algorithm | |
| CN206345654U (en) | A kind of ball valve working seal inspection platform |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |