CN111188419A - Rod piece connecting node based on crack identification technology and crack identification method thereof - Google Patents

Rod piece connecting node based on crack identification technology and crack identification method thereof Download PDF

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Publication number
CN111188419A
CN111188419A CN202010074757.0A CN202010074757A CN111188419A CN 111188419 A CN111188419 A CN 111188419A CN 202010074757 A CN202010074757 A CN 202010074757A CN 111188419 A CN111188419 A CN 111188419A
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CN
China
Prior art keywords
rod
crack identification
node
down tube
piece
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.)
Pending
Application number
CN202010074757.0A
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Chinese (zh)
Inventor
何林
刘聪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Harbin Dazhilin Technology Development Co Ltd
Harbin Institute of Technology
Original Assignee
Harbin Dazhilin Technology Development Co Ltd
Harbin Institute of Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Harbin Dazhilin Technology Development Co Ltd, Harbin Institute of Technology filed Critical Harbin Dazhilin Technology Development Co Ltd
Priority to CN202010074757.0A priority Critical patent/CN111188419A/en
Publication of CN111188419A publication Critical patent/CN111188419A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38Connections for building structures in general
    • E04B1/58Connections for building structures in general of bar-shaped building elements
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00Image analysis
    • G06T7/0002Inspection of images, e.g. flaw detection
    • G06T7/0004Industrial image inspection
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00Image analysis
    • G06T7/10Segmentation; Edge detection
    • G06T7/11Region-based segmentation
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00Image analysis
    • G06T7/70Determining position or orientation of objects or cameras
    • G06T7/73Determining position or orientation of objects or cameras using feature-based methods

Abstract

The invention belongs to the field of structural engineering, and particularly relates to a rod connecting node based on a crack identification technology and a crack identification method thereof, which solve the problems of large installation gap, eccentric rod connection and difficult crack control of the conventional temporary rod system structural node. A rod piece connecting node based on a crack identification technology comprises an upright rod, an inclined rod and a cross rod, wherein the inclined rod is divided into an upper inclined rod and a lower inclined rod; four vertical rod U-shaped lugs are uniformly distributed on the circumference of the side face of the vertical rod, an upper bolt hole, a middle bolt hole and a lower bolt hole are formed in each vertical rod U-shaped lug and are respectively used for connecting an upper inclined rod, a cross rod and a lower inclined rod, a mark plate is arranged on the end portion, close to the end portion of the vertical rod, of the cross rod, and four circular mark points are sprayed on the mark plate.

Description

Rod piece connecting node based on crack identification technology and crack identification method thereof
Technical Field
The invention belongs to the field of structural engineering, and particularly relates to a rod piece connecting node based on a crack identification technology and a crack identification method thereof.
Background
The temporary rod system structure is formed by connecting slender rods through nodes, and has the advantages of light weight of members, flexible form, reusability and the like. Early temporary bar system structures were primarily used as temporary facilities in construction work, such as scaffolding and formwork support. In recent years, with the improvement of the living standard of people's materials and the vigorous development of the sports culture industry, various temporary performances and competitions are continuously performed, and the demands on performance platforms and competition facilities are greatly increased. The temporary rod system structure has short construction period and flexible form, can meet various form requirements such as temporary stands, temporary stages, temporary ski tracks and the like, can be detached immediately after use and repeatedly used, has obvious economic benefit, and is widely applied. At present, support structures such as temporary stands, temporary stages and temporary ski runs are mostly transplanted from template support structures. When the temporary rod system structure is applied to stands, stages, ski tracks and electronic screen supporting frames, the safety requirement of the structure is improved by one level, the borne load is fundamentally changed, the temporary rod system structure is one of the main reasons for frequent accidents in the application process of the temporary structure, and adverse effects are brought to further expansion and application of the temporary structure. Because the temporary bleachers and the temporary stage structures need to bear a large amount of activities of people, the safety requirements of the structures need to be further improved compared with the template supports.
The node is an important part of the structure and is the key for ensuring the safety of the structure and improving the installation efficiency. Traditional temporary rod system structure node, for example fastener formula node, the installation effectiveness is low, and the eccentric phenomenon of down tube is serious moreover, and the rod piece that bowl knot formula node is connected is limited, and the down tube is arranged limitedly. Although the bolt type and the plug disc type node greatly improve the installation efficiency, the eccentric center of the inclined rod connecting node still exists, the node gap is large, and the accumulated error caused by the node gap is not negligible for a high temporary rod system structure.
The node crackle is the important hidden danger of node safety, and the node is the member intersection district, and the atress is complicated, in the used repeatedly, easily appears the crackle, and can make the node function inefficacy after the crackle is accumulated to a certain degree, makes the structure take place to destroy. The traditional method for identifying the cracks by naked eyes is easily affected by the quality of observers, the cracks are difficult to quantify, and the error is large.
If the temporary structure advantages are ensured and the structure safety is further improved, new nodes need to be researched and developed according to temporary structure characteristics, the node gap is reduced on the basis of not reducing the installation efficiency, the eccentric installation of the rod piece is eliminated, and the crack control is realized.
Disclosure of Invention
The invention provides a rod connecting node based on a crack identification technology and a crack identification method thereof, and solves the problems of large installation gap, eccentric rod connection and difficult crack control of the conventional temporary rod system structure node.
The technical scheme for solving the problems is as follows:
a rod piece connecting node based on crack identification technology is characterized in that:
the device comprises upright rods, inclined rods and cross rods, wherein the inclined rods are divided into upper inclined rods and lower inclined rods;
four upright rod U-shaped lugs are uniformly distributed on the circumference of the side surface of each upright rod, and an upper bolt hole, a middle bolt hole and a lower bolt hole are formed in each upright rod U-shaped lug and are respectively used for connecting an upper inclined rod, a cross rod and a lower inclined rod;
the end part of the cross rod, which is close to the vertical rod, is provided with a sign board, and four round sign points are sprayed on the sign board.
Furthermore, above-mentioned horizontal pole includes the horizontal pole pipe, the tip that the horizontal pole pipe is close to the pole setting is equipped with the horizontal pole end piece, is connected with the U-shaped piece on the horizontal pole end piece, and the U-shaped piece is used for with pole setting U-shaped ear connection, and the flag setting is close to horizontal pole end piece department on the horizontal pole pipe.
Further, the down tube and the upper down tube have the same structure, the upper down tube comprises a round tube, the round tube is close to the end of the vertical rod and connected with a tapered tube, the end of the tapered tube is connected with an end plate of the down tube, the end plate of the down tube is connected with a U-shaped groove, a side wing of the U-shaped groove is welded with a right end piece, and the other side wing is connected with a left end piece through a pin shaft.
Furthermore, the inclined rod and the cross rod are fixed on bolt holes of U-shaped lugs of the vertical rods through joint connecting pins, each joint connecting pin comprises a left part and a right part, and each part comprises an end head area, a stress area and a transition area which are sequentially connected;
the end area adopts conical hexahedron, the stress area is a rod piece, the transition area of the left part is a conical pipe, threads are arranged in the conical pipe, the transition area of the right part is a conical rod, and the end part of the conical rod is provided with external threads matched with the conical pipe.
Furthermore, the vertical rods, the inclined rods and the cross rods are subjected to zinc plating treatment.
The invention also provides a crack identification method of the rod piece connecting node based on the crack identification technology, which is characterized by comprising the following steps of:
1) placing the node area containing the sign board in the image;
2) graying and filtering the image, and searching for a mark point in a node image;
3) according to an image segmentation algorithm, segmenting the region to obtain a specific position of a target region;
4) and identifying the seed points of the target area, judging the seed points, eliminating the pseudo seed points, and finally growing the seed points to obtain the cracks of the node target area.
The invention has the advantages that:
(1) the vertical rod connecting node adopts the U-shaped lug and is provided with the connecting hole, so that the cross rod, the inclined rod and the vertical rod are connected in the same plane, and the problem of node eccentricity is solved;
(2) the node connecting pin adopts the conical region for transition, so that the node mounting clearance is reduced, and the node mounting efficiency is improved;
(3) according to the crack identification method based on the single image, the number of the cracks of the nodes and the sizes of the cracks can be obtained by shooting the single image through the camera, the problems that crack detection is affected by the quality of workers and has large errors are solved, and the detection efficiency is improved.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a view showing the construction of a diagonal bar;
FIG. 3 is a cross bar construction;
FIG. 4 is a view of a node connecting pin configuration;
fig. 5 is a structural view of an L-shaped wrench.
Wherein, 1-a vertical rod U-shaped ear; 2-a diagonal rod; 3-a cross bar; a 4-node connecting pin; 5-a diagonal rod circular tube; 6-tapered tube of the inclined rod; 7-left end piece; 8-right end piece; 9-a U-shaped groove; 10-diagonal bar end plates; 11-cross-bar round tubes; 12-mark points; 13-cross bar end pieces; 14-U-shaped pieces; 41-left end zone; 42-left force zone; 43-left transition zone; 44-right end zone; 45-right stress zone; 46-right transition zone; 15-L-shaped spanner.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1-4, a rod connecting node based on crack recognition technology comprises a vertical rod, an inclined rod 2 and a cross rod 3, wherein the inclined rod 2 is divided into an upper inclined rod and a lower inclined rod; four upright rod U-shaped lugs 1 are uniformly distributed on the circumference of the side surface of the upright rod, and an upper bolt hole, a middle bolt hole and a lower bolt hole are formed in each upright rod U-shaped lug 1 and are respectively used for connecting an upper inclined rod, a cross rod 3 and a lower inclined rod.
The cross rod 3 comprises a cross rod round tube 11, the end part of the cross rod round tube is welded with a cross rod end sheet 13, a U-shaped sheet 14 is welded on the cross rod end sheet 13, and the U-shaped sheet 14 is used for being connected with a middle hole of the vertical rod U-shaped lug 1. A mark plate with the side length of 25mm is welded at the position, close to the end portion, of the transverse rod circular tube 11, 4 mark points 12 with the diameter of 5mm are sprayed on the mark plate, the distance between circle centers is 15mm, and the mark points 12 are used for later-stage crack identification.
Go up down the down tube, it includes down tube 5 to go up the down tube, its tip welding down tube taper pipe 6, the end connection down tube end plate 10 of down tube taper pipe 6, is connected with U-shaped groove 9 on the down tube end plate 10, and a flank welding right-hand member piece 8 in U-shaped groove 9, another flank round pin hub connection have a left end piece 7, make left end piece 7 can rotate around the round pin axle. The connection in this way mainly considers the connection sequence of the rod pieces, and ensures that the inclined rod can be freely installed or disassembled after the cross rod is connected.
The inclined rod 2 and the cross rod 3 are fixed on a bolt hole of the U-shaped lug 1 of the vertical rod through a node connecting pin 4. Referring to fig. 4, the node connecting pin 4 includes a left part and a right part, each of which includes a head region, a force bearing region and a transition region connected in sequence; the end area is a tapered hexahedron that mates with the end of an L-shaped wrench (see fig. 5). The stress area is a rod piece, the transition area of the left part is a conical pipe, threads are arranged in the conical pipe, the transition area of the right part is a conical rod, and the end part of the conical rod is provided with external threads matched with the conical pipe.
After the connecting pin is connected with the rod piece, the left stress area 42 and the right stress area 45 in fig. 4 are just connected with the U-shaped sheet 14, the left end sheet 7 and the upright rod U-shaped lug 1 in fig. 1 to bear the pulling and pressing force of the rod piece connection. In fig. 4, 43 is the left transition zone and the middle of the left transition zone 43 is a threaded bolt hole, in most cases the connecting pin cannot be fully inserted at once, it is likely that the bar connecting piece is located in the transition zone of the connecting pin, but now the extension of the right transition zone 46 in fig. 4 has been connected to the left transition zone 43, and by turning, by means of a tightening force, the connecting pin can be fully inserted. In the process of connecting the nodes, the cross rods 3 can be connected firstly, and then the inclined rods 2 can be connected. When the inclined rod 2 is connected, the left end piece 7 in the figure 1 is rotated to be vertical to the connection state, then the left end piece is drawn close to the node of the vertical rod from the outside of the plane, after the right end piece 8 in the figure 1 is completely attached to the U-shaped lug 1 of the vertical rod, the left end piece 7 is rotated to the direction in the connection state, and finally the connecting pin is inserted to connect the left end piece and the right end piece.
When the connecting pin is screwed down, the special L-shaped wrench 15 is adopted, and when the connecting pin is used, the end part of the wrench is sleeved in the end head area of the connecting pin.
The vertical rod, the inclined rod 2 and the cross rod 3 are galvanized.
This embodiment member connected node can be arranged in interim structures such as interim bleachers, interim stage, interim skiing platform.
The invention also provides a crack identification method of the rod piece connecting node based on the crack identification technology, which comprises the following steps:
1) placing the node area containing the sign board in the image;
2) and (5) image preprocessing. The method specifically comprises the following steps: the node image is subjected to graying, filtering and other processing, then the mark points 12 in the node image are searched, and the obtained center pixel coordinates of the mark points 12 are in one-to-one correspondence with the world coordinates.
3) And positioning the target area. The method specifically comprises the following steps: and positioning the target area according to the determined node size, calculating the pixel coordinates of the target area after obtaining the extrinsic 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.
4) And (5) detecting cracks. The method specifically comprises the following steps: the method 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 a node target area. Because the manual marking points with known sizes are arranged on the cross bar, the size of the crack can be determined only by a single image.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art can still adjust the technical solutions described in the above embodiments, or make equivalent substitutions for some technical features thereof. Therefore, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (6)

1. A member bar connection node based on crack identification technology is characterized in that:
comprises a vertical rod, an inclined rod (2) and a cross rod (3), wherein the inclined rod (2) is divided into an upper inclined rod and a lower inclined rod;
four upright rod U-shaped lugs (1) are uniformly distributed on the circumference of the side surface of each upright rod, and an upper bolt hole, a middle bolt hole and a lower bolt hole are formed in each upright rod U-shaped lug (1) and are respectively used for connecting an upper inclined rod, a cross rod (3) and a lower inclined rod;
the end part of the cross rod (3) close to the vertical rod is provided with a sign board, and four round sign points (12) are sprayed on the sign board.
2. A rod connection node based on crack identification technology according to claim 1, characterized in that:
the cross rod (3) comprises a cross rod round tube (11), a cross rod end piece (13) is arranged at the end part, close to the vertical rod, of the cross rod round tube (11), a U-shaped piece (14) is connected to the cross rod end piece (13), and the U-shaped piece (14) is used for being connected with a U-shaped lug (1) of the vertical rod.
3. A rod connection node based on crack identification technology according to claim 2, characterized in that:
go up down the down tube, it is the same with down the down tube structure to go up the down tube, go up the down tube and include down tube (5), end connection down tube toper pipe (6) that down tube (5) are close to the pole setting, the end connection down tube end plate (10) of down tube toper pipe (6), be connected with U-shaped groove (9) on down tube end plate (10), a flank welding right-hand member piece (8) of U-shaped groove (9), another flank round pin hub connection has left end piece (7).
4. A rod connection node based on crack identification technology according to claim 3, characterized in that:
the inclined rod (2) and the cross rod (3) are fixed on a bolt hole of the U-shaped lug (1) of the vertical rod through a node connecting pin (4), the node connecting pin (4) comprises a left part and a right part, and each part comprises an end area, a stress area and a transition area which are sequentially connected;
the end area adopts conical hexahedron, the stress area is a rod piece, the transition area of the left part is a conical pipe, threads are arranged in the conical pipe, the transition area of the right part is a conical rod, and the end part of the conical rod is provided with external threads matched with the conical pipe.
5. A rod connection node based on crack identification technology according to any of claims 1-4, characterized in that:
the upright rods, the inclined rods (2) and the cross rods (3) are galvanized.
6. A rod piece connecting node crack identification method based on a crack identification technology is characterized by comprising the following steps:
1) placing the node area containing the sign board in the image;
2) graying and filtering the image, and searching for a mark point (12) in the node image;
3) according to an image segmentation algorithm, segmenting the region to obtain a specific position of a target region;
4) and identifying the seed points of the target area, judging the seed points, eliminating the false seed points, and finally growing the seed points to obtain the cracks of the node target area.
CN202010074757.0A 2020-01-22 2020-01-22 Rod piece connecting node based on crack identification technology and crack identification method thereof Pending CN111188419A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010074757.0A CN111188419A (en) 2020-01-22 2020-01-22 Rod piece connecting node based on crack identification technology and crack identification method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010074757.0A CN111188419A (en) 2020-01-22 2020-01-22 Rod piece connecting node based on crack identification technology and crack identification method thereof

Publications (1)

Publication Number Publication Date
CN111188419A true CN111188419A (en) 2020-05-22

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6205739B1 (en) * 1998-10-09 2001-03-27 Tomcat Global Corporation Connector node
CN1821519A (en) * 2005-12-22 2006-08-23 高维成 Tension string beam structure with dog bone type damper
CN201521034U (en) * 2009-08-13 2010-07-07 河北省第四建筑工程公司 Light steel pipe net rack node member
CN206468640U (en) * 2017-02-09 2017-09-05 湖南长丰猎豹汽车有限公司 Improve driving sideslip fore sub frame positioning tool and apply its fore sub frame
CN107238375A (en) * 2017-04-28 2017-10-10 东南大学 Detect the one camera photogrammetric survey method of bridge rubber bearing displacement
CN109440946A (en) * 2018-12-24 2019-03-08 河南郑大建筑材料有限公司 A kind of novel truss structure node

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6205739B1 (en) * 1998-10-09 2001-03-27 Tomcat Global Corporation Connector node
CN1821519A (en) * 2005-12-22 2006-08-23 高维成 Tension string beam structure with dog bone type damper
CN201521034U (en) * 2009-08-13 2010-07-07 河北省第四建筑工程公司 Light steel pipe net rack node member
CN206468640U (en) * 2017-02-09 2017-09-05 湖南长丰猎豹汽车有限公司 Improve driving sideslip fore sub frame positioning tool and apply its fore sub frame
CN107238375A (en) * 2017-04-28 2017-10-10 东南大学 Detect the one camera photogrammetric survey method of bridge rubber bearing displacement
CN109440946A (en) * 2018-12-24 2019-03-08 河南郑大建筑材料有限公司 A kind of novel truss structure node

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
韩涛、吴衡: "基于立体视觉的直升机旋翼桨叶三维动态变形测量", 《科学技术与工程》 *

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Application publication date: 20200522