CN1986958B - How to make a stay cable with a helix - Google Patents

Abstract

The invention discloses a method for making anti-wind and wind vibration measures for the helical wire of the cable stay, which mainly includes the following steps: a. Preliminarily use the homogeneous material of the cable sheath to make ribs, and wind them up on the coil; b. The exit position of the extruder head where the cable extrudes the PE sheath is equipped with a power device that drives the rotation around the center of the cable, and is equipped with a winding device that can install the rotating shaft of the wire reel; c. When the molten PE is extruded on the cable After the body is attached, the ribs are glued to the surface of the sheath, so that the sheath and the ribs are thermally fused together. d. Simultaneously start the driving device of the winding device, so that the winding device rotates, driving the coil installed on the rotating shaft to rotate, and the cable After extruding the PE sheath, it moves forward in a straight line, and the ribs are wound around the cable as the center, thus forming helically wound ribs on the cable. The invention is ingeniously conceived, which solves the technical problem of producing spiral ribs in the factory, and can control the pitch of the spiral through a mechanized device, and it is no longer necessary to fix the spiral ribs to the draglines with clamps at certain lengths. On the surface, it is of great promotional value.

Description

How to make a stay cable with a helix

technical field

The invention relates to a method suitable for making aerodynamic damping measures on the surface of parallel steel wire cables in bridge construction engineering.

Background technique

Parallel steel wire cables are the key components used in bridge construction engineering structures. Its structure is shown in Figure 1. The inside of the cable is steel wire 1', bound and shaped by strap 2', and then extruded outside with high-density polyethylene (PE ) sheath 3' plays the role of anticorrosion of the parallel wire rope, the section of the cable is circular, and the surface of the PE sheath is relatively smooth. Studies have shown that under the joint action of wind and rain, cables with circular cross-sections and smooth surfaces are likely to cause large-scale vibrations, that is, wind and rain induced vibrations. At present, the most effective way to suppress the wind and rain-induced vibration of the cable is to take aerodynamic vibration reduction measures. Condition; moving waterline on the surface of the cable. Such as polygonal cable body, longitudinal ribs are set on the surface of the cable body, pits are made on the surface of the cable lift, ribs are spirally wound on the surface of the cable body, a casing with a helical line on the outer surface is made and then installed on the cable, etc. Wherein winding the spiral rib on the surface of the cable is a relatively effective measure, such as the spiral rib 4' as shown in Figure 2. However, the check and winding of the spiral ribs needs to be carried out after the construction and installation of the cables by the bridge builder, and it is time-consuming and labor-intensive to make special aerial climbing vehicles and other equipment.

Contents of the invention

The purpose of the present invention is to provide a kind of can effectively overcome above-mentioned defect, can make drag cable extrude PE sheath in factory, finish the manufacturing method of the stay cable with helical thread of sheath surface helical rib.

In order to achieve the above object, the technical solution adopted in the present invention is: a manufacturing method of a stay cable with a helix, which mainly includes the following steps, a. making ribs with the same material of the cable sheath in advance and winding them online on the disk; b. A power device is installed at the exit of the extruder head where the cable extrudes the PE sheath and can rotate around the center of the cable, and is equipped with a winding device that can install the rotating shaft of the wire reel; c. When the melted After PE is extruded on the cable body, the ribs are glued to the surface of the sheath, so that the sheath and the ribs are thermally fused together. d. Simultaneously start the driving device of the winding device, so that the winding device rotates and drives the wire installed on the shaft. The disk rotates, and the cable moves forward in a straight line after the PE sheath is extruded, and the ribs are rotated around the cable as the center, thus forming spirally wound ribs on the cable.

In the above scheme, in order to adjust the helical winding pitch of the ribs to meet the requirements, the rotation speed of the winding device and the pulling speed of the steel wire cable can be adjusted; A friction or electromagnetic device is set on the rotating shaft to adjust the rotation resistance of the wire reel, thereby adjusting the winding tension of the ribs, and then adjusting the protrusion height of the ribs on the surface of the cable; the rotating shaft of the wire drum can be installed on the winding device. One, so that a multi-headed spiral rib can be made on the surface of the cable sheath.

Due to the adoption of the above scheme, it is not difficult to draw the following conclusions. The present invention has an ingenious conception, which solves the technical problem of making spiral ribs in the factory. Compared with spiral winding at the construction site, there are fewer operating procedures, and more The helical pitch can be controlled, and it is no longer necessary to fix the helical tendon on the surface of the cable with clamps at certain lengths.

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

Description of drawings

Figure 1 is a cross-sectional structure diagram of an ordinary parallel steel wire cable without aerodynamic damping measures.

Fig. 2 is a schematic cross-sectional view of the aerodynamic damping measures of spiral ribs.

Figure 3 is a cross-sectional schematic diagram of the aerodynamic vibration reduction measures of double-ended spiral ribs

Fig. 4 and Fig. 5 are schematic diagrams of the operation of an embodiment of the present invention.

Detailed ways

As shown in Fig. 4 and Fig. 5, the winding device 1 is installed in the front position of the extruder head outlet 2, and the motor 8, the reducer 7, the pinion 6, the bull gear 5, the bearing 16, and the turntable 15 constitute the driving device. Easy to operate, the driving device is installed on the frame 9 that can move back and forth. The cable sheath 3 in a melted state is extruded from the outlet portion 2 of the machine head and coated on the steel cable 4 . The tendons 11 made of the same material of the cable sheath 3 are pre-rolled on the wire reel 10 that can rotate freely around the axle 12, and the axle 12 is installed on the bearing 17 on the rotating disk 15.

Working process: the steel wire cable 4 is pulled forward at a certain speed, and the sheath 3 is extruded from the outlet part 2 of the machine head and covered on the steel wire cable 4; After being thermally fused with the sheath 3, driven by the advance of the steel wire cable and the rotation of the turntable, the tendon 11 begins to spirally wrap around the steel wire cable 4 that has covered the protective peach. Under continuous operation, the surface of the cable becomes smooth. Spiral bars are made. What the present embodiment makes is the tendon of double-ended spiral.

In order to adjust the helical pitch requirements of the ribs of different cables, it can be realized by adjusting the rotating speed of the driving device and the pulling speed of the wire cables.

By adjusting the tension of the friction belt 14, the surface friction of the friction disk 13 installed on the shaft 12 can be adjusted, thereby adjusting the winding tension of the ribs 11a, 11b, and further adjusting the protrusion height of the ribs on the surface of the cable sheath.

Claims (2)

1. A method for making a stay cable with a helix, mainly comprising the following steps: a. making tendons with the same material of the cable sheath in advance, and winding on the wire reel; b. The exit position of the extruder head of the vinyl sheath is equipped with a winding device that can rotate around the center of the cable under the drive of the power device and is equipped with a rotating shaft that can be installed with a coil; c. When the molten polyethylene is extruded on the cable body After being attached, the ribs are glued to the surface of the sheath, so that the sheath and the ribs are thermally fused together; d. Simultaneously start the driving device of the winding device, so that the winding device rotates, driving the wire reel installed on the rotating shaft to rotate, and the cable is on the After extruding the polyethylene sheath, it moves forward in a straight line, and the ribs rotate around the cable to form helically wound ribs on the cable. 2. The manufacturing method of a kind of stay cable with helix according to claim 1, characterized in that: in the above-mentioned steps, by adjusting the winding tension of the ribs, and then adjusting the protrusion of the ribs on the surface of the cable sheath high.

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