CN105508355B - A kind of containment type node - Google Patents

Abstract

The invention provides an inclusive node, which belongs to the technical field of mechanical connectors. The contained joint includes a curved plate and a main chord section for connecting the main chords of the tubular structural trusses. Wherein, the curved plate includes an edge portion and a bulge protruding from the edge portion; the shape of the edge portion matches the shape of the main chord, and the edge wraps the main chord portion. The invention can effectively simplify the node structure, reduce the stress concentration of the node, improve the strength and reliability of the node, and make the truss structure which is usually 30% lighter than the box structure be widely used, especially in lifting and engineering machinery and areas with heavy dynamic loads.

Description

an inclusive node

technical field

The invention belongs to the technical field of mechanical connectors, and relates to a node, especially an inclusive node.

Background technique

In the field of lifting and transportation machinery and large construction machinery, under the same conditions, the truss-type metal structure is more than 30% lighter than the box-type structure (the weight of the longitudinal and transverse ribs inside the box-type structure is about 1/3 of its total weight). When the tubular trusses are under compression, they have equal strength and are most suitable for trusses. In addition, the truss structure also has many advantages such as no internal reinforcement, simple manufacturing process, and small wind load in outdoor environments. However, in the prior art, the truss structure has not been widely used, and the main limiting factor is that the design and manufacture of its nodes (that is, the intersection of the main chord and the web) are difficult, and it is easy to become the source of accidents. The failure damage and major accidents of truss structures in the world basically start from their nodes. At present, the joints of the column truss are mostly intersecting or reinforced plate, as shown in Fig. 1 and Fig. 2 respectively. Although it can form a truss very well, under severe working conditions, accidents of joint cracking and gradual failure due to fatigue occur from time to time. Therefore, good joints are the key to promoting the wide application of truss structures and exerting their advantages.

Contents of the invention

The purpose of the present invention is to provide a joint that can effectively reduce welder requirements, reduce stress concentration, and improve the strength and reliability of the truss structure.

In order to achieve the above object, the solution of the present invention is:

An inclusive joint, comprising a curved plate and a main chord part for connecting the main chord of a pipe structure truss; wherein, the curved plate includes an edge portion and a bulge protruding from the edge portion part; the shape of the edge part matches the shape of the main chord, and the edge part wraps the part of the main chord.

The inclusive node also includes a web portion, and the raised portion includes a mounting hole, and the web portion is installed in the raised portion through the mounting hole.

The curved plate wraps at least half of the circumference of the main chord to ensure sufficient connection between the curved plate and the main chord.

The height and width of the raised portion are selected to ensure sufficient space to accommodate the web and to avoid overlap of weld seams.

Ribs are added to the inner wall of the raised portion.

The inclusive node adopts the same material as the parent material.

The curved plate is connected to the main chord part by welding.

The curved plate is connected to the web portion by welding.

Due to the adoption of the above scheme, the beneficial effects of the present invention are: the inclusive joint proposed by the present invention, first of all, can minimize the stress concentration because of the reasonable force flow transmission, and the experiment proves that the stress concentration is only one-third of the traditional joint 1. Secondly, the intersecting line connecting the curved plate and the main chord can be extended to the maximum, which is about 2-3 times that of the traditional intersecting joint, thus dispersing the stress on the weld and improving the truss The strength and reliability of the structure; in addition, by inserting the web into the curved plate and then welding the outside, it can eliminate the fact that the web of the traditional node can only be welded on the surface of the main chord, so that the main chord bears a large force in the Z direction In this case, the problem of surface tearing that may occur when the node is under severe working conditions is prevented, and its reliability is further improved. In addition, the inclusive joint proposed by the present invention can be installed on the main chord for welding after complete annealing after the separate manufacturing and cutting, which partially reduces the internal stress caused by construction; The large internal stress cannot be reduced or eliminated by annealing, which will cause hidden dangers in the use of nodes. In a word, the present invention can effectively simplify the manufacture of joints, and can produce good joints without advanced welders, so that the truss structure, which is usually lighter than the box structure by more than 30%, can be widely used, especially in lifting and Construction machinery and areas with heavy dynamic loads.

Description of drawings

Fig. 1 is a schematic structural diagram of an intersecting node in the prior art;

Fig. 2 is a structural schematic diagram of a reinforced slab node in the prior art;

Fig. 3 is a schematic structural diagram of an inclusive node in an embodiment of the present invention;

Fig. 4 is the front view of curved plate in this embodiment of the present invention;

Fig. 4 a is the sectional view of curved plate at A-A place among Fig. 4;

Fig. 4b is a sectional view of the curved plate at B-B in Fig. 4;

Figure 4c is a sectional view of the curved plate at C-C in Figure 4;

Figure 4d is a cross-sectional view of the curved plate in Figure 4 at D-D.

In the attached drawings: 1. Curved plate; 2. Main chord part; 3. Web part.

Detailed ways

The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

The present invention proposes an inclusive joint, which includes a curved plate for connecting the main chord and the web of the pipe structure truss, the main chord part and the web part connected with the curved plate, and the main chord part And the web part is the part of the tube structure truss that is close to the curved plate and belongs to the contained node. Fig. 3 is a structural schematic diagram of the inclusive joint, in which 1 is the curved plate, 2 is the main chord part, and 3 is the web part; Fig. 4 is the front view of the curved plate in the inclusive joint; Fig. 4a, Fig. 4b, 4c and 4d are cross-sectional views of the curved plate in Fig. 4 at A-A, B-B, C-C and D-D respectively.

The above-mentioned curved plate 1 includes an edge portion and a protrusion protruding from the edge portion in a bulging shape. The shape of the edge part matches the shape of the main chord part 2 , the edge part wraps around the main chord part 2 . The raised portion includes a mounting hole, and the web part 3 is inserted into the raised portion through the mounting hole. The curved plate 1 wraps at least half of the circumference of the main chord part 2 to ensure sufficient connection between the curved plate 1 and the main chord part 2 .

Figure 4a, Figure 4b, Figure 4c and Figure 4d reflect the change of the shape of the curved plate from one angle. In the curved plate 1, the height and width of the protrusion are selected to ensure that the web part can be well inserted into the mounting hole, that is, to ensure sufficient space to accommodate the web part 3 and to avoid overlap of weld seams.

The inclusive joint adopts the same material as the base material (namely the main chord); its thickness is greater than or equal to the thickness of the base material. In this embodiment, the thickness of the contained joint is 2 mm thicker than that of the base material.

In the present invention, the contained node can be manufactured by forging, or pressure forming, or explosive forming. In particular, explosive molding does not require an upper mold and is suitable for small batch production. After forming, the contained joint is fully annealed to relieve internal stress.

In order to improve its rigidity, in this embodiment, the inner wall of the raised portion is reinforced.

In order to obtain the inclusive joint, the curved plate 1 and the main chord part 2 are tightly fitted, so that the edge of the curved plate 1 tightly wraps the main chord part 2, and the curved plate 1 along the edge and the main chord The rod parts 2 are welded together. After the curved plate 1 and the main chord part 2 are welded in the present invention, their intersecting line is 2-3 times of the intersecting line of the traditional intersecting joint, which greatly prolongs the weld seam connected with the main chord, and improves the connection strength. After that, the web part 3 is inserted into the boss, and the web part and the boss are welded together. This is different from the prior art in which the chord and the web are only welded on the outer surface and the node, eliminating the interlayer force of the main chord in the Z direction (that is, the direction of the thickness of the main chord), and can effectively Prevent the tearing of the node surface and improve the reliability of the node.

In addition, in the present invention, the strength and stability of the contained joint can also be considered according to the actual situation, and the installation hole on the raised part and the web part connected thereto are not provided, that is, the contained joint only includes a curved plate And the main chord part, the above-mentioned installation holes are not opened on the curved plate.

The containment joint proposed by the present invention, first of all, can minimize its stress concentration due to its reasonable force flow transmission, and the experiment proves that its stress concentration is only one-third of that of the traditional joint; secondly, it can also maximize the extension of the curved plate The intersecting line connected with the main chord is about 2-3 times that of the traditional intersecting node, thus dispersing the stress on the weld and improving the strength and reliability of the truss structure; in addition, it can By inserting the web into the bulge of the node, and then welding the outside, it can eliminate the situation that the web of the traditional node can only be welded on the surface of the main chord and the Z-direction force of the main chord is large, preventing the node from being exposed to severe conditions. The problem of surface tearing that may occur during working conditions further improves its reliability. In addition, the inclusive node of the present invention can be installed on the main chord for welding after complete annealing after the separate manufacturing and cutting, which partially reduces the internal stress caused by construction; while the traditional node has a large The internal stress cannot be reduced or eliminated by annealing, which will cause hidden dangers in the use of nodes.

In a word, the present invention can effectively simplify the manufacture of joints, and good joints can be manufactured without advanced welders. The inclusive joints proposed by the invention enable the truss structure, which is generally 30% lighter than the box structure, to be widely used, especially in the fields of lifting and engineering machinery and heavy dynamic loads.

The above description of the embodiments is for those of ordinary skill in the art to understand and apply the present invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative effort. Therefore, the present invention is not limited to the embodiments herein. Improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention.

Claims (6)

1. a kind of containment type node, it is characterised in that：Bent plate and main string including the main chord that is used for connecting pipe structure truss Bar part；Wherein, the bent plate includes edge part and from the edge part with the lug boss of bulge shape protrusion；The edge part Shape and the main chord form fit, the edge part wraps up the main chord part；

The containment type node further includes web member part, and the lug boss includes mounting hole, and the web member part passes through described Mounting hole is mounted in the lug boss.

2. containment type node according to claim 1, it is characterised in that：The main string of the bent plate package at least half Bar circumference, to ensure the abundant connection of the bent plate and the main chord.

3. containment type node according to claim 1, it is characterised in that：The height of the lug boss and width are to ensure to have Sufficient space accommodates the web member and weld seam overlapping is avoided to select.

4. containment type node according to claim 1, it is characterised in that：The inner wall of the lug boss is added with muscle.

5. containment type node according to claim 1, it is characterised in that：The bent plate passes through weldering with the main chord part It connects in succession.

6. containment type node according to claim 1, it is characterised in that：The bent plate passes through welding with the web member part Connection.