CN107313604A - A kind of drag-line node reinforced for space structure string - Google Patents

Abstract

The invention relates to a cable node used for string tension reinforcement of a space structure, which realizes reinforcement on a welded ball node (5) of an existing structure, including a steel wire rope (1), a cable (2), and a double-eared cable head (3) ), the pin shaft (4), and the limit steel pipe (6), the pin shaft (4) passes through the ear hole of the double ear type cable head (3), and the two ends of the steel wire rope go around the welded ball joint (5) and are placed on the pin shaft On (4), the limit steel pipe is fixed on the welded ball node (5), which plays the role of limiting the sliding of the steel wire rope along the sphere.

Description

A kind of cable node for space structure reinforcement

technical field

The invention relates to a cable node used for string tension reinforcement of space structures.

Background technique

Since the 1960s, the grid structure has gradually developed in our country. At present, some projects need to strengthen the structure because they have reached their service life, construction quality or load changes. Commonly used grid reinforcement methods include fiber reinforcement method, bonded steel reinforcement method, casing reinforcement method and prestressed reinforcement method. Among them, the prestressed reinforcement method changes the original grid structure into a stringed structure system by adding cables and struts, which can effectively reduce the deformation of the structure and improve the rigidity of the structure. At the same time, the reinforcement construction does not need to unload the existing structure, and the number of rods to be reinforced is also greatly reduced, which is an efficient reinforcement method.

The cables need to be anchored to the support nodes to transmit the prestress to the support. In the tension string structure, the cable joints can adopt ear plates or balls, etc. However, the support of the existing network frame is often connected with more and larger rods, and the remaining space on the sphere is small. The structure of the connection node of the support brings great difficulties; at the same time, if the traditional node construction method is adopted, the structure needs to be unloaded when the structure is welded, and the workload of the reinforcement project is relatively large.

Contents of the invention

In view of the above-mentioned problems, the present invention solves the problem of the difficult structure of the cable and the support node when adopting prestressed reinforcement to the existing structure, and provides a tensioning cable for space structure reinforcement that can reduce the workload of on-site welding and is easy to operate. index node. The invention realizes the connection between the stay cable and the support node through the steel wire rope, and does not need to weld other connection devices at the support node, and the steel wire rope can evenly distribute the cable force on the welded spherical surface, so that the support node does not need to be reinforced. Technical scheme of the present invention is as follows:

A cable node used for space structure string tension reinforcement, which realizes reinforcement at the welded ball node 5 of the existing structure, is characterized in that it includes a steel wire rope 1, a cable 2, a double-eared cable head 3, a pin shaft 4, and a limiter Position steel pipe 6, the pin shaft 4 passes through the ear hole of the double-eared cable head 3, the two ends of the steel wire rope bypass the welded ball joint 5 and then cover the pin shaft 4, and the limit steel pipe is fixed on the welded ball joint 5 to limit the wire rope along the The effect of sphere sliding.

The steel wire rope can be a single rope, and the resultant force of its two limbs needs to coincide with the direction of the center line of the cable, and the intersection line between the steel wire rope and the welded ball node should be a generatrix of the sphere; The direction of the cable centerline coincides. The extension line of the center line of the cable passes through the center of the welding ball node.

Compared with the prior art, the present invention has the following advantages:

(1) The welded hollow ball is connected with the cable by a wire rope, which has a simple structure and easy on-site operation.

(2) Less post-processing is required for welding the hollow ball, which reduces the workload of on-site welding.

(3) The steel wire rope can evenly distribute the cable force on the welded spherical surface, so that the support nodes do not need to be reinforced.

Description of drawings

Fig. 1 is a left side view of the present invention.

Explanation of symbols in the figure: 1-steel wire rope; 2-stay cable; 3-double lug cable head; 4-pin shaft;

Figure 2 is a rear view of the present invention.

Explanation of symbols in the figure: 1-steel wire rope; 5-welded ball joint of existing structure; 6-limiting steel pipe

Figure 3 Node top view

Explanation of symbols in the figure: 1-steel wire rope; 2-stay cable; 3-double lug cable head; 4-pin shaft;

detailed description

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

The present invention proposes a cable anchoring node for prestressed reinforcement, including a steel wire rope 1, a cable 2, a double-eared cable head 3, a pin shaft 4, an existing structure welded ball node 5 and a limit steel pipe 6. The two ends of the steel wire rope are sheathed on the bearing pin 4 after bypassing the welded ball joint 5, and the bearing pin 4 passes through the ear holes of the double-ear cable head 3.

The steel wire rope can be single or multiple. When a single rope is used, the combined force of its two limbs must coincide with the direction of the center line of the cable, and the intersection line between the steel wire rope and the ball node should be a generatrix of the sphere. When multiple steel wire ropes are used, the resultant force of each limb of the steel wire rope must coincide with the direction of the center line of the cable.

The stay cables can be steel strands, semi-parallel steel strands or high vanadium cables and other building structure stay cables. The extension line of the cable centerline passes through the spherical center of the spherical node.

The double-eared cable head is generally a part of the cable product, and is connected with the cable body by the cable manufacturer using cold-cast anchors or hot-cast anchors.

The welding ball node of the existing structure is the node where the original roof structure and the supporting structure are connected.

The position-limiting steel pipe plays the role of limiting the sliding of the steel wire rope along the sphere, and its cross section is determined according to the tangential force component of the steel wire rope along the surface of the sphere.

As shown in Figures 1, 2, and 3, it includes a ring wire rope 1, a drag cable 2, a double-ear cable head 3, a pin shaft 4, an existing structure welded ball node 5, and a limit steel pipe 6. The axial direction of the cable 2 passes through the spherical center of the welded ball joint 5 of the existing structure, and the eyelets at both ends of the steel wire rope bypass the welded ball joint 5 and are placed on the pin shaft 4. The axial directions of the upper and lower steel wire ropes are symmetrical to the cable axis. . Bearing pin 4 passes the ear hole of double ear type cable head 3, and the limit steel pipe is positioned at both sides up and down of steel wire rope.

Claims (4)

1. A kind of stay cable node that is used for space structure string tension reinforcement, realizes reinforcement on existing structure welded ball joint (5), is characterized in that, comprises steel wire rope (1), stay cable (2), double-ear type cable head (3), pin shaft (4), and limit steel pipe (6), the pin shaft (4) passes through the ear hole of the double-eared cable head (3), and the steel wire rope goes around the welded ball joint (5) and the two ends are covered On the pin shaft (4), the limit steel pipe is fixed on the welded ball joint (5), which plays the role of limiting the sliding of the steel wire rope along the sphere. 2. The cable node according to claim 1, characterized in that, the steel wire rope adopts a single rope, and the resultant force of its two limbs needs to coincide with the direction of the center line of the cable, and the intersection line of the steel wire rope and the welded ball node should be a sphere. a busbar. 3. The cable node according to claim 1, wherein the steel wire rope is multi-rope, and the resultant force of each limb of the steel wire rope must coincide with the direction of the centerline of the cable. 4. The cable node according to claim 1, wherein the extension line of the center line of the cable passes through the center of the welded ball node.