Crane, crane truss, crane truss node structure and construction method thereof

Abstract

The application discloses a crane, a crane truss, a crane truss node structure and a construction method thereof, the crane truss comprises a track, the track comprises opposite upper chords and lower chords, the upper chords are provided with box-shaped structures with a box-shaped cross section, the box-shaped structures comprise opposite upper flanges and lower flanges, and an intermediate web plate is arranged between the upper flanges and the lower flanges; a transverse partition plate is arranged on the intermediate web plate; an outer web plate is arranged below the transverse partition plate, a first inclined web plate and a second inclined web plate are respectively connected to the outer web plate, the transverse partition plate and the extensions of the first inclined web plate and the second inclined web plate intersect at a node position of the upper chord, and the intermediate web plate transmits the vertical load of the track to the node position through the transverse partition plate. The application can improve the fatigue resistance of the truss, meet the use requirements of the crane truss, especially the large-span crane truss, and improve the reliability and service life of the truss during use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a crane, a crane truss, a crane truss node structure and a construction method thereof. BACKGROUND

[0002] Trusses are widely used in steel structures, mainly used in industrial and civil building roofs (roof trusses, etc.), crane beams (i.e. crane trusses), stations and bridge engineering, etc. When truss structures bear external loads, they must act on the nodes, and the loads will be borne by all the members in a simple compression or tension manner, and the nodes only transmit linear forces of the members and bear shear forces, without transmitting bending moments.

[0003] Taking a crane truss as an example, the chord of the crane truss usually adopts an I-shaped section, and the web members and the chords are connected by rigid connection or node plate connection. However, the existing crane trusses, whether using rigid connection or node plate connection for the web members and the chords, have poor fatigue resistance, and cannot well meet the use requirements of crane trusses, especially large-span crane trusses.

[0004] Therefore, it is necessary to provide a node structure with excellent fatigue resistance for crane trusses, especially large-span crane trusses with high requirements for fatigue resistance. SUMMARY

[0005] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present application is to provide a crane, a crane truss, a crane truss node structure and a construction method thereof, so as to greatly improve the fatigue resistance of the truss, so as to meet the use requirements of the crane truss, especially the large-span crane truss, and improve the reliability and service life of the truss during use.

[0006] The specific technical scheme in the embodiments of the present application is:

[0007] A construction method of a node structure of a crane truss, the span of the crane truss being more than 60 meters, the crane truss comprising a track, the track comprising opposite upper chords and lower chords, the construction method comprising:

[0008] A box-shaped structure with a box-shaped cross section is arranged on the upper chord of the crane truss, the box-shaped structure comprising: opposite upper flanges and lower flanges;

[0009] An intermediate web plate is additionally arranged below the track, and the intermediate web plate is connected with the upper flange and the lower flange of the box-shaped structure, respectively;

[0010] A cross diaphragm is arranged on the intermediate web plate corresponding to the track arrangement, which can directly bear the wheel load of the crane on the track, and the vertical load of the track is transmitted to the node of the crane truss through the cross diaphragm of the intermediate web plate, and the cross diaphragm is used to bear the vertical concentrated load transmitted by the intermediate web plate.

[0011] An outer web plate is arranged below the cross diaphragm.

[0012] The outer web plate of the upper chord is connected with the first inclined web plate and the second inclined web plate, respectively, the cross diaphragm intersects with the extension lines of the first inclined web plate and the second inclined web plate at the node position of the upper chord, and the vertical load of the track is transmitted to the node position through the cross diaphragm of the intermediate web plate.

[0013] The first inclined web plate is provided with a first connecting part for connecting with the outer web plate, the outer web plate is provided with a first matching part for connecting with the first inclined web plate, and the first matching part and the first connecting part are smoothly transitioned at the matching position; the second inclined web plate is provided with a second connecting part for connecting with the outer web plate, and the outer web plate is provided with a second matching part for connecting with the second inclined web plate, and the second matching part and the second connecting part are smoothly transitioned at the matching position.

[0014] The area of the outer web plate matched with the inclined web plate reaches 2 / 3 of the cross section.

[0015] In a preferred embodiment, the cross diaphragm and the outer web plate adopt a melting nozzle electroslag welding.

[0016] In a preferred embodiment, the outer web plate of the upper chord is welded between the first inclined web plate and the second inclined web plate.

[0017] The technical scheme of the application has the following remarkable beneficial effects:

[0018] The construction method of the node structure of the crane truss provided in the application adopts a box-shaped cross section for the upper chord of the crane truss, and an intermediate web plate is arranged below the track, and the vertical load of the track is transmitted to the node of the truss through the cross diaphragm of the intermediate web plate. The whole structure is reasonably stressed, and there is no position requiring a sudden change of cross section, which greatly relieves the stress concentration problem. Compared with the traditional chord and web plate which adopt I-shaped steel section steel and web plate which adopt I-shaped steel, respectively, the node fatigue resistance is greatly improved (more than 20% improvement in node fatigue strength according to analysis), the service life of the crane truss is increased as a whole, the steel consumption is reduced, and the node structure has good popularization and application value.

[0019] The particular embodiments of the application described herein are illustrative examples of the principles of the application. Other embodiments could be devised without departing from the spirit of the application. Accordingly, the scope of the application is not intended to be limited to the particular embodiments described. The drawings are included to provide a description of the principles of the application and not as a definition of the application. The drawings are not intended to be exhaustive or comprehensive. Modifications can be made to the drawings and specific operations described herein. For example, certain process parameters could be varied. It is intended, however, that the present application cover any and all modifications of the application within the scope of the claims. The features of one embodiment can be used in one or more other embodiments, either alone or in combination with other features. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings described herein are for purposes of illustration only and are not intended to limit the scope of the present application. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the application. The drawings are not intended to limit the scope of the application in any way. The features of the drawings can be used in any combination or sub-combination with the features of other drawings.

[0021] Figure 1 A schematic view of a node structure of a crane truss according to an embodiment of the present application.

[0022] Figure 2 A schematic view of a node structure of a crane truss according to another embodiment of the present application.

[0023] Figure 3 A-A sectional view of the Figure 1

[0024] B-B sectional view of the Figure 4 Figure 2 C-C sectional view of the

[0025] Figure 5 Figure 3 Figure 4

[0026] Figure 6 A construction method of a node structure of a crane truss according to an embodiment of the present application.

[0027] Reference numerals in the above drawings:

[0028] 10, top chord;

[0029] 1, top flange;

[0030] 2, bottom flange;

[0031] 3, outer web;

[0032] 4, middle web;

[0033] ​​​​5, transverse diaphragm;

[0034] 6, inclined web member;

[0035] 61, first inclined web member;

[0036] 62, second inclined web member;

[0037] 7, track. DETAILED DESCRIPTION

[0038] The technical solutions of the present application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. After reading the present application, those skilled in the art can make various equivalent modifications to the present application, which fall within the scope defined by the appended claims.

[0039] It should be noted that when an element is referred to as "disposed on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0041] The large-span crane truss can be a crane truss with a span of more than 60 meters. The larger the span of the crane truss, the greater the internal force of the rod member, and the more prone the node to fatigue failure, so the requirement for fatigue resistance is higher.

[0042] The inventors have found that the existing crane truss has poor fatigue resistance because the web member and chord member are connected by rigid connection or node plate connection, which causes stress concentration due to the sudden change in the cross section of the node part.

[0043] Please refer to Figures 1 to 5In the embodiments of the present application, a node structure of a crane truss is provided, which can include: the crane truss includes a track 7, the track 7 includes opposite upper chords 10 and lower chords, the upper chords 10 are provided with box-shaped structures in a box-shaped cross section, the box-shaped structures include: opposite upper flanges 1 and lower flanges 2, and an intermediate web 4 is arranged between the upper flanges 1 and the lower flanges 2; a cross diaphragm 5 is arranged on the intermediate web 4; an outer web 3 is arranged below the cross diaphragm 5, the outer web 3 is respectively connected with a first inclined web 61 and a second inclined web 62, the cross diaphragm 5 and the extensions of the first inclined web 61 and the second inclined web 62 intersect at a node position of the upper chord 10, and the intermediate web 4 transmits the vertical load of the track 7 to the node position through the cross diaphragm 5.

[0044] The node structure of the crane truss provided in the embodiments of the present application has the upper chords 10 of the crane truss in a box-shaped cross section, and an intermediate web 4 is added below the track 7, the intermediate web 4 transmits the vertical load of the track 7 to the node position of the truss through the cross diaphragm 5 at the node. The entire structure is reasonably stressed, and there is no position requiring a sudden change in cross section, greatly relieving the stress concentration problem. Compared with the conventional method of connecting the chord with an I-shaped steel section bar and the web with an I-shaped steel section bar by rigid connection, the node fatigue resistance of the node structure is greatly improved (more than 20% improvement in node fatigue strength according to analysis), the service life of the crane truss is increased as a whole, the amount of steel used is reduced, and the node structure has good popularization and application value.

[0045] Specifically, please refer to Figure 1 , Figure 3 and Figure 5 or Figure 2 , Figure 4 and Figure 5 The node structure of the crane truss mainly includes: the upper chords 10, the intermediate web 4, the cross diaphragm 5 and the inclined web of the box-shaped structure.

[0046] The upper chords 10 of the track 7 are provided with a box-shaped structure in a box-shaped cross section. The cross section of the box-shaped structure is a relatively closed frame body. For example, the relatively closed frame body can be a rectangular body. When the upper chords 10 of the track 7 adopt the box-shaped structure, the cross section is stressed better, and the node structure is facilitated to be optimized and designed.

[0047] The box-shaped structure includes: opposite upper flanges 1 and lower flanges 2, and an intermediate web 4 is arranged between the upper flanges 1 and the lower flanges 2; a cross diaphragm 5 is arranged on the intermediate web 4; and an outer web 3 is arranged below the cross diaphragm 5. The intermediate web 4 is arranged corresponding to the track 7 and directly bears the wheel load of the crane on the track 7. The cross diaphragm 5 is specifically a steel plate arranged at the node and used for bearing the vertical concentrated load transmitted by the intermediate web 4.

[0048] Specifically, the transverse plate 5 and the outer side web plate 3 of the box structure can be welded by using a melting nozzle electroslag welding, or the outer side web plate 3 on both sides of the transverse plate 5 is disconnected, and the outer side web plate 3 and the transverse plate 5 are welded by using butt welding. Since the transverse plate 5 transmits force to the outer side web plate 3 of the box structure, the two need to be connected by welding to realize the transmission of internal force. The specific welding mode of the transverse plate 5 and the outer side web plate 3 can be set according to the specific form and matching relationship of the transverse plate 5 and the outer side web plate 3.

[0049] The melting nozzle electroslag welding is a high-efficiency melting welding method, and can be used to weld large-section workpieces with complex shapes. The melting nozzle electroslag welding uses the resistance heat generated by the current passing through the high-temperature liquid slag as a heat source to melt the workpieces (steel plates, castings, forgings) and the filler metal (welding wire and melting nozzle), and the melted metal passes through the liquid slag pool in the form of droplets and collects in the lower part of the slag pool to form a metal pool.

[0050] In one embodiment, the first inclined web member 61 is provided with a first connecting portion for connecting with the outer side web plate 3, and the outer side web plate 3 is provided with a first matching portion for connecting with the first inclined web member 61, and the first matching portion and the first connecting portion are smoothly transitioned at the matching position.

[0051] Similarly, the second inclined web member 62 is provided with a second connecting portion for connecting with the outer side web plate 3, and the outer side web plate 3 is provided with a second matching portion for connecting with the second inclined web member 62, and the second matching portion and the second connecting portion are smoothly transitioned at the matching position.

[0052] In the embodiment, the box-shaped outer side web plate 3 at the node is connected to the inclined web member 6 of the truss in a smooth transition mode, which can ensure that the connection position of the outer side web plate 3 and the inclined web member 6 is smoothly transitioned. Specifically, the matching area of the outer side web plate 3 and the inclined web member 6 can reach about 2 / 3 of the cross section, thereby ingeniously reducing the sudden change of the cross section and improving the fatigue strength of the entire node.

[0053] For example, the first inclined web member 61 is provided with a first connecting portion at the end, which can be a groove with a certain arc, and correspondingly, the first matching portion of the outer side web plate 3 can be a flange with a certain arc matched with the groove. Of course, the specific form of the first connecting portion and the first matching portion is not limited to the above examples, and those skilled in the art can also make other changes under the technical essence of the present application, as long as the functions and effects achieved are the same or similar to the present application, which should be covered within the protection scope of the present application.

[0054] The upper chord 10 and the inclined web member 6 can be connected by welding or high-strength bolt connection. These two connection methods can be adaptively selected according to actual needs.

[0055] Please refer to Figure 1 , Figure 3 and Figure 5 , the upper chord 10 and the first inclined web member 61 and the second inclined web member 62 are welded. When the upper chord 10 and the first inclined web member 61 and the second inclined web member 62 are welded, the installation precision is not high, and the requirement for the operator is lower.

[0056] Please refer to Figure 2 , Figure 4 and Figure 5 , the upper chord 10 and the first inclined web member 61 and the second inclined web member 62 are connected by bolts. When the upper chord 10 and the first inclined web member 61 and the second inclined web member 62 are connected by bolts, the bolt is a high-strength bolt, and the number of high-strength bolts can be set according to the actual connection strength requirement, for example, two rows are set, each row is set with multiple, forming a high-strength bolt array, so as to ensure the strength of the connection position. Overall, under the premise of being able to ensure the installation precision, the bolt connection is more convenient and fast.

[0057] Based on the node structure of the crane truss provided in the above embodiment, the present application also provides a crane truss comprising any of the above-mentioned node structures of the crane truss. Of course, the crane truss can at least achieve the same technical effects as the node structure of the crane truss, and the specific details are not described here.

[0058] It should be noted that the node structure of the crane truss is more suitable for large-span crane trusses, specifically, the span of the crane truss is more than 60 meters. When the crane truss is a large-span crane truss, the span is large, the internal force of the member is large, the node is prone to fatigue failure, and the requirement for fatigue resistance is higher.

[0059] Based on the crane truss provided in the above embodiment, the present application also provides a crane comprising any of the above-mentioned crane trusses. Of course, the crane can at least achieve the same technical effects as the node structure of the crane truss, and the specific details are not described here.

[0060] Please refer to Figure 6 , based on the node structure of the crane truss provided in the above embodiment, the present application also provides a construction method of the node structure of the crane truss, which can include the following steps:

[0061] Step S10: a box-shaped structure with a box-shaped cross section is arranged on the top chord 10 of the crane truss;

[0062] Step S12: an intermediate web plate 4 is additionally arranged under the track 7, and the intermediate web plate 4 is connected with the upper flange 1 and the lower flange 2 of the box-shaped structure respectively;

[0063] Step S14: a cross diaphragm plate 5 is arranged on the intermediate web plate 4, and the intermediate web plate 4 transmits the vertical load of the track 7 to the node of the crane truss through the cross diaphragm plate 5;

[0064] Step S16: an outer web plate 3 is arranged below the cross diaphragm plate 5;

[0065] Step S18: the outer web plate 3 of the top chord 10 is connected with the first inclined web plate 61 and the second inclined web plate 62 respectively.

[0066] In the construction method of the node structure of the crane truss, the top chord 10 of the crane truss adopts a box-shaped cross section, an intermediate web plate 4 is additionally arranged under the track 7, and the intermediate web plate 4 transmits the vertical load of the track 7 to the node of the crane truss through the cross diaphragm plate 5 at the node. The entire structure is reasonably stressed, and there is no position where the cross section needs to be suddenly changed, greatly relieving the stress concentration problem. Compared with the traditional method of connecting the chord with an I-shaped steel section bar and the web plate with an I-shaped steel, the fatigue resistance of the node structure is greatly improved (more than 20% improvement in node fatigue strength through analysis), the service life of the crane truss is increased as a whole, the amount of steel used is reduced, and the node structure has good popularization and application value.

[0067] The outer web plate 3 and the cross diaphragm plate 5 are connected by butt welding after the outer web plate 3 on both sides of the cross diaphragm plate 5 is disconnected. The top chord 10 and the first inclined web plate 61 and the second inclined web plate 62 are connected by welding or bolt connection.

[0068] It should be noted that, in the description of the present application, the terms "first", "second" and the like are only used for description purposes and to distinguish similar objects, and there is no sequence or relative importance between them. In addition, in the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0069] The above various embodiments in the specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment mainly explains the difference from other embodiments.

[0070] The above merely describes several embodiments of the present application. Although the embodiments of the present application are described as above, the content is merely the adopted embodiments for facilitating the understanding of the present application, and is not used for limiting the present application. Any person skilled in the art of the present application can make any modification and change in the form and details of the embodiments without departing from the spirit and scope of the present application. The patent protection scope of the present application shall be subject to the range defined by the appended claims.

Claims

1. A construction method for a node structure of a crane truss, characterized in that, The crane truss has a span of over 60 meters, and includes a track. The track includes opposing upper and lower chords. The construction method includes: A box-shaped structure with a box-shaped cross-section is provided on the upper chord of the crane truss. The box-shaped structure includes: opposing upper flanges and lower flanges. An intermediate web plate is added under the track, and the intermediate web plate is connected to the upper flange and lower flange of the box-shaped structure respectively; A transverse diaphragm is provided on the intermediate web plate, which is arranged corresponding to the track and can directly bear the wheel pressure load of the crane on the track. The intermediate web plate transmits the vertical load of the track to the node of the crane truss through the transverse diaphragm. The transverse diaphragm is used to bear the concentrated vertical load transmitted from the intermediate web plate. An outer web plate is installed below the diaphragm; The outer web of the upper chord is connected to the first and second inclined web members respectively. The diaphragm intersects the extension lines of the first and second inclined web members at the node position of the upper chord. The middle web transfers the vertical load of the track to the node position through the diaphragm. The first diagonal web member is provided with a first connecting portion for connecting to the outer web plate, and the outer web plate is provided with a first mating portion for connecting to the first diagonal web member. The mating positions of the first mating portion and the first connecting portion have a smooth transition structure. The second diagonal web member is provided with a second connecting portion for connecting to the outer web plate, and the outer web plate is provided with a second mating portion for connecting to the second diagonal web member. The mating positions of the second mating portion and the second connecting portion have a smooth transition structure. The area where the outer web plate and the diagonal web member cooperate reaches 2 / 3 of the cross section.

2. The construction method for the nodal structure of the crane truss as described in claim 1, characterized in that, The diaphragm and the outer web are joined by electroslag welding with a molten nozzle.

3. The construction method for the nodal structure of the crane truss as described in claim 1 or 2, characterized in that, The outer web of the upper chord is welded to the first and second oblique web members.

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