CN203701284U - Carbon fiber cloth reinforced steel pipe truss tubular joint - Google Patents

Abstract

The utility model discloses a steel pipe truss intersecting node reinforced with carbon fiber cloth, which includes a main and branch pipe of the reinforced node, and the branch pipe of the reinforced node is welded on the main pipe of the reinforced node to form an intersecting node; it also includes several pieces of carbon fiber Cloth, which is woven by fiber bundles and plastic braided wires, and is laminated in multiple layers along the hoop and longitudinal directions and pasted on the main pipe of the reinforced node. On the short sides, there are intersecting line contours that coincide with the intersecting nodes of the main and branch pipes of the reinforced node. The circumferential carbon fiber cloth on the rest of the main pipe of the reinforced node is pasted end-to-end in a closed manner. The longitudinal carbon fiber cloth Paste evenly in the reinforcement area of the reinforced node supervisor. It improves the static performance of the pipe joints and improves the anti-seismic and anti-fatigue performance of the joints, ensuring that the pipe truss structure has higher bearing capacity, better anti-seismic performance and longer service life.

Description

Intersecting joints of steel pipe truss reinforced with carbon fiber cloth

technical field

The utility model relates to a carbon fiber cloth (CFRP) reinforced steel pipe truss intersecting joint, which is suitable for joint reinforcement and joint repair and reinforcement of welded pipe truss structures during service, and belongs to the technical field of construction engineering. the

Background technique

At present, welded intersecting tubular joints have been widely used in large-scale structural projects such as offshore platform structures, bridge structures, and stadiums due to their beautiful shape and superior performance. For typical truss intersecting joints, the branch pipes generally bear the effects of axial force, bending moment and combined force, so the main pipe at the intersection of the truss joints bears the radial load, bending moment load and combined load from the branch pipes. The radial stiffness of the main pipe of the node is much smaller than the axial stiffness of the branch pipe. In addition, there is a large stress concentration and complex residual stress at the weld toe, so the main pipe at the intersecting part of the truss node is the most prone to damage. In order to follow the basic principle of "strong joints and weak members", it is generally necessary to reinforce the intersecting parts of the main branches of the truss joints to improve the seismic performance and static performance of the pipe joints. At present, the commonly used reinforcement methods for pipe joints include: internal stiffening ring reinforcement, internal insert plate reinforcement, local thickening reinforcement, backing plate reinforcement, ring mouth plate reinforcement and external stiffening rib plate reinforcement, etc. the

There are obvious shortcomings in the above reinforcement measures, which are mainly reflected in:

1. Both need to be welded with the reinforced node components, which will cause secondary damage, residual stress and stress concentration to the nodes;

2. The construction of the built-in reinforcement method is relatively difficult, and the main tube of the reinforcement node needs to be cut, which will weaken the strength of the main tube;

3. Although the construction of the external reinforcement method is relatively simple, it will affect the beauty of the structure and even affect the usable space of the structure. the

Utility model content

The purpose of this utility model is to provide a steel pipe truss intersecting node reinforced with carbon fiber cloth, which is simple in operation, convenient in construction, low in cost, suitable for construction in a narrow space, and will not cause secondary damage to the node. the

In order to solve the above problems, the technical solution adopted by the utility model is: a steel pipe truss intersecting node reinforced with carbon fiber cloth, which includes a reinforced node main pipe and a reinforced node branch pipe, and the reinforced node branch pipe is welded on the reinforced node On the main pipe, and form intersecting nodes, it also includes several pieces of carbon fiber cloth, the carbon fiber cloth is a rectangular cloth woven from fiber bundles and plastic braided wires; Longitudinal overlapping layers are pasted on the main pipe of the reinforced node, and the two short sides of the carbon fiber cloth at the intersecting node of the main pipe of the reinforced node and the branch pipe of the reinforced node are respectively provided with the main pipe of the reinforced node and the branch pipe of the reinforced node. The intersecting line profile of the intersecting nodes coincides, the circumferential carbon fiber cloth on the remaining parts of the main tube of the reinforced node is pasted end-to-end in a closed manner, and the longitudinal carbon fiber cloth is evenly pasted on the reinforcement of the main tube of the reinforced node. In the region, and the length of the reinforced region is 3 to 4 times the diameter of the branch pipe of the node to be reinforced. the

Further, the reinforced node main pipe and the reinforced node branch pipe are round steel pipes or rectangular steel pipes. the

Further, the profile of the intersecting lines is an arc-shaped gap. the

Further, the length of the circumferential carbon fiber cloth is 30 mm longer than the circumference of the outer diameter of the reinforced node main pipe. the

The beneficial effects of the utility model are: the utility model can reinforce and repair and reinforce the nodes of the welded pipe truss structure during the service period. It will not cause damage, residual stress and stress concentration on the reinforced joints; it can effectively improve the static performance of the pipe joints and improve the seismic and fatigue resistance of the joints, thereby ensuring that the pipe truss structure has a higher bearing capacity and better earthquake resistance performance and longer lifespan. the

Description of drawings

Figure 1 is a schematic diagram of the overall structure of reinforced intersecting pipe joints;

Fig. 2 is a schematic diagram of carbon fiber cloth (CFRP);

Figure 3 is a schematic diagram of the processing of carbon fiber cloth (CFRP) directly below the branch pipe. the

In the figure: 1. The main tube of the reinforced node; 2. The branch pipe of the reinforced node; 3. Carbon cloth fiber; 4. Fiber bundle; 5. Plastic braided line, 6. Intersecting line outline. the

Detailed ways

Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail. the

As shown in Figures 1 to 3, a steel pipe truss intersecting node reinforced with carbon fiber cloth includes a reinforced node main pipe 1 and a reinforced node branch pipe 2, and the reinforced node branch pipe 2 is welded to the reinforced node main pipe 1 and form intersecting nodes, and also include several pieces of carbon fiber cloth 3, the carbon fiber cloth 3 is a rectangular cloth woven from fiber bundles 4 and plastic braided wires 5; The circumferential and longitudinal overlapping layers of 1 are pasted on the main pipe 1 of the reinforced node, and the two short sides of the carbon fiber cloth 3 at the intersecting node of the main pipe 1 of the reinforced node and the branch pipe 2 of the reinforced node are respectively provided with The intersecting line profile 6 of the intersecting node of the reinforced node main pipe 1 and the reinforced node branch pipe 2 coincides, and the circumferential carbon fiber cloth 3 of the remaining parts on the reinforced node main pipe 1 is all adopted end-to-end closed paste, The longitudinal carbon fiber cloth 3 is evenly pasted in the reinforced area of the reinforced node main pipe 1, and the length of the reinforced area is 3 to 4 times the diameter of the reinforced node branch pipe 2. the

The reinforced node main pipe 1 and the reinforced node branch pipe 2 are round steel pipes or rectangular steel pipes. the

The intersecting line profile 6 is an arc-shaped notch. the

The length of the circumferential carbon fiber cloth 3 is 30 mm longer than the circumference of the outer diameter of the reinforced node main pipe 1 . the

Its reinforcement method is:

(1) Firstly, prepare matching or adjust the structural adhesive with appropriate strength, and cut the required length of longitudinal carbon fiber cloth 3 and hoop carbon fiber cloth 3; the length of the longitudinal carbon fiber cloth 3 is determined by the reinforced node supervisor 1 The required reinforcement length is determined; the length of the circumferential carbon fiber cloth 3 is 30mm longer than the outer diameter circumference of the reinforced node main pipe 1, and the circumferential carbon fiber cloth 3 at the position directly below the reinforced node branch pipe 2 needs to be Cut out a ring-shaped gap at both ends that coincides with the intersecting line of the reinforced node main pipe 1 and the reinforced node branch pipe 2, as shown in Figure 3;

(2) Use sandpaper or an electric iron brush to polish the surface of the main pipe 1 of the reinforced node, polish the floating rust on the surface, then wipe the polished area with acetone, and wait for it to dry;

(3) Use a brush to evenly apply the structural glue to the reinforced area on the surface of the main pipe 1 of the reinforced node, and the thickness of the structural glue is about 1mm;

(4) Paste the fiber bundle 4 on the surface of the reinforced area of the reinforced node main pipe 1 along the axial direction of the reinforced node main pipe 1 according to the direction of the fiber bundle 4. Each piece of longitudinal carbon fiber cloth 3 needs to overlap 10 mm at the adjacent edges, and the entire The reinforcement area of the reinforced node supervisor 1 is covered;

(5) After each piece of longitudinal carbon fiber cloth 3 is pasted, use a plastic scraper to repeatedly scrape repeatedly along the direction of the fiber bundle 4 to drive out the air bubbles and make the structural glue penetrate into the fiber bundle 4 of the carbon fiber cloth 3 ;

(6) Apply a layer of structural glue on the surface of the longitudinal carbon fiber cloth 3 that has been pasted, and stick the circumferential carbon fiber cloth 3 on both sides of the reinforced node branch pipe 2 around the reinforced node main pipe 1 end-to-end to the pasted The surface of the longitudinal carbon fiber cloth 3; directly below the reinforced node branch pipe 2, after the annular notch of the carbon fiber cloth 3 in the circumferential direction coincides with the position of the intersecting line of the main and branch pipes 1 and 2 of the reinforced node, bypass the The bottom of the node to be reinforced is in charge of 1, that is, from the saddle point on one side of the node to be reinforced to the saddle point on the other side, glued to the main surface of the longitudinally reinforced node that has been pasted;

(7) After each piece of circumferential carbon fiber cloth 3 is pasted, use a plastic scraper to repeatedly scrape repeatedly along the direction of the fiber bundle 4 to drive out the air bubbles and make the structural glue penetrate into the fiber bundle 4 of the carbon fiber cloth 3 go in;

(8) Repeat the above steps 4 to 7, and respectively carry out the two-layer pasting of the longitudinal and circumferential carbon fiber cloth 3;

The utility model can reinforce and repair the joints of the welded pipe truss structure during the service period. The reinforced joints are simple in operation, convenient in construction, low in cost, suitable for construction in narrow spaces and will not cause damage to the reinforced joints. The influence of residual stress and stress concentration; it can effectively improve the static performance of pipe joints and improve the anti-seismic and anti-fatigue performance of joints, thereby ensuring that the pipe truss structure has higher bearing capacity, better anti-seismic performance and longer service life. the

Claims (4)

1. A steel pipe truss intersecting node reinforced with carbon fiber cloth, which comprises a reinforced node supervisor (1) and a reinforced node branch pipe (2), and the reinforced node branch pipe (2) is welded on the reinforced node supervisor (1) ), and form intersecting nodes, characterized in that: it also includes several pieces of carbon fiber cloth (3), the carbon fiber cloth (3) is a rectangular cloth woven from fiber bundles (4) and plastic braided wires (5) type; the carbon fiber cloth (3) is pasted on the reinforced node supervisor (1) along the circumferential and longitudinal overlapping layers of the reinforced node supervisor (1), and is located at the reinforced node supervisor (1) and the reinforced The two short sides of the carbon fiber cloth (3) at the intersecting node of the node branch pipe (2) are provided with intersecting line profiles that coincide with the intersecting nodes of the reinforced node main pipe (1) and the reinforced node branch pipe (2) (6), the circumferential carbon fiber cloth (3) on the remaining parts of the reinforced node supervisor (1) is pasted end-to-end in a closed manner, and the longitudinal carbon fiber cloth (3) is evenly pasted on the reinforced node supervisor (1) within the reinforcement area, and the length of the reinforcement area is 3 to 4 times the diameter of the node branch pipe (2) to be reinforced. the 2. The steel pipe truss intersecting node reinforced with carbon fiber cloth according to claim 1, characterized in that: the reinforced node main pipe (1) and the reinforced node branch pipe (2) are round steel pipes or rectangular steel pipes. the 3. The steel pipe truss intersecting node reinforced with carbon fiber cloth according to claim 1 or 2, characterized in that: the intersecting line profile (6) is an arc-shaped gap. the 4. The steel pipe truss intersecting node reinforced with carbon fiber cloth according to claim 3, characterized in that: the length of the circumferential carbon fiber cloth (3) is longer than the outer diameter circumference of the reinforced node main pipe (1) 30mm. the