Chord member reinforcing method based on pre-stressed anchor cable method

Abstract

The invention discloses a chord member reinforcing method based on a pre-stressed anchor cable method, which aims at temporary reinforcement of an over-limit chord member of a large-span steel structure building, and comprises the following steps: firstly, determining a chord member to be reinforced, and then respectively sleeving steel wire ropes at an upper chord node and a lower chord node of the chord member to be reinforced; secondly, the tail end of the steel wire rope at the upper chord node and the tail end of the steel wire rope at the lower chord node are fixed to the corresponding lifting hooks respectively; and finally, an electric hoist is used for applying pulling force to the two lifting hooks in the axis direction of the chord member to be reinforced, so that the two steel wire ropes are pulled oppositely. Prestress is applied to the upper chord node and the lower chord node of the overrun chord member through the tensioning inhaul cable, the additional bending moment of the overrun chord member can be reduced, the stress of the overrun chord member can be reduced, and the adopted reinforcing device is simple in structure, convenient to disassemble and assemble and small in dead weight, has a weak influence on the dead weight and the section size of the overrun chord member, and is suitable for large-scale production. The method is used for temporary reinforcement of the large-span net rack steel structure and has high efficiency and economical efficiency.

Description

Technical Field

[0001] This invention relates to the reinforcement of chord members in large-span steel structure buildings, specifically to a chord member reinforcement method based on prestressed anchor cable method. Background Technology

[0002] In steel structure buildings with large spans, chords play a crucial supporting role. In certain applications, such as large outdoor concert stages, performance equipment needs to be installed on the steel structure. The weight of this equipment increases the additional load on the steel structure. In addition, outdoor wind loads also cause additional loads, creating a potential risk of instability for the chords in the structure.

[0003] Currently, the main methods for strengthening chord members in engineering projects include increasing the cross-section, external steel reinforcement, and carbon fiber reinforcement. While increasing the cross-section can enlarge the member's cross-section through welding steel sections or pouring concrete, it leads to increased structural weight, longer construction time, and negatively impacts the building's appearance. External steel reinforcement involves wrapping the column with angle steel or steel plates and connecting them with gusset plates, but it suffers from complex joint treatment and significant damage to the original structure. Carbon fiber reinforcement relies on bonding fiber cloth to improve load-bearing capacity, but under large eccentric compression or dynamic loads, the fiber cloth is prone to peeling, indicating insufficient durability. Summary of the Invention

[0004] This invention discloses a method for reinforcing oversized chords in large-span space frames based on prestressed anchor cables. This method can be used for temporary reinforcement of oversized chords, with minimal impact on the chord's self-weight and cross-sectional dimensions, and is both efficient and economical.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A chord reinforcement method based on prestressed anchor cable method includes the following: Step 1): Identify the chord members to be reinforced; Step 2): Install steel wire ropes at the upper chord node and the lower chord node of the chord to be reinforced; Step 3): Fix the ends of the wire rope at the upper chord node and the lower chord node to the corresponding hooks respectively; Step 4): Use an electric hoist to apply tension to the two hooks along the axis of the chord to be reinforced, so that the two wire ropes are pulled towards each other.

[0006] Furthermore, when the steel wire ropes are being fitted, rubber pads are first installed at the nodes of the chords to be reinforced, so that the rubber pads wrap around the chords to be reinforced in the circumferential direction, and then the steel wire ropes are fitted over the rubber pads.

[0007] Furthermore, the rubber pad is fixed with bolts.

[0008] Furthermore, the thickness of the rubber pad is not less than 10 mm.

[0009] Furthermore, the wire rope needs to be wrapped around the chord to be reinforced several times during installation.

[0010] Furthermore, the end of the wire rope is fixed to the buckle, and then the buckle is fitted onto the hook.

[0011] Furthermore, the fastener is a U-shaped fastener.

[0012] The solution disclosed in this invention is applicable to the temporary reinforcement of over-limit chord members. By applying prestress to the upper and lower chord nodes of the over-limit chord members through tension cables, the additional bending moment of the over-limit chord members can be reduced, and the stress of the over-limit chord members can be reduced. Moreover, the reinforcement device used has a simple structure, is easy to assemble and disassemble, and has a small self-weight. It has a negligible impact on the self-weight and cross-sectional dimensions of the over-limit chord members. It is suitable for the temporary reinforcement of large-span space frame steel structures, combining high efficiency and economy. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the over-limit chord reinforcement structure shown in the embodiment.

[0014] Figure label: 1. String member to be reinforced; 2. Upper chord node; 3. Lower chord node; 4. Rubber pad; 5. Steel wire rope; 6. Fastener; 7. Electric hoist. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0016] This embodiment provides a method for temporary reinforcement of excessively large chord members in a long-span steel space frame structure, based on prestressed anchor cables. A steel space frame structure is composed of multiple connected chord members, such as... Figure 1 As shown, nodes are formed at the connection points of multiple chords. On the same chord, upper chord node 2 and lower chord node 3 are formed in the height direction, respectively. (For simplification, the diagram is incomplete.) Figure 1 Only the chord member to be reinforced, 1, is shown in its entirety; other connecting chord members are only partially illustrated. The reinforcement method for chord member 1 is as follows: Step 1): First, determine the position of the chord 1 to be reinforced in the space frame structure.

[0017] Step 2): Install rubber pads 4 at the upper chord node 2 and the lower chord node 3 of the chord 1 to be reinforced.

[0018] Specifically, the rubber pad 4 is wrapped around the root of the node of the chord 1 to be reinforced in the circumferential direction, and the rubber pad 4 is fixed with high-strength bolts. The installation of the rubber pad 4 can avoid stress concentration. Therefore, the thickness of the rubber pad 4 is preferably greater than or equal to 10mm. In this embodiment, the thickness of the rubber pad 4 is 10mm.

[0019] Step 3): After installing the rubber pad 4, a steel wire rope 5 is respectively fitted over the outside of the rubber pad 4 at the upper chord node 2 and the lower chord node 3. When fitting the steel wire rope 5, it needs to be wrapped around the chord 1 to be reinforced several times.

[0020] Step 4): Fix the ends of the wire rope 5 at the upper chord node 2 and the lower chord node 3 to a buckle 6 respectively, forming a rope buckle structure through the buckle 6. In this embodiment, a U-shaped buckle is used. Then, the buckle 6 is respectively fitted onto the corresponding hooks.

[0021] Step 5): Using a device capable of applying tension, simultaneously apply tension to both hooks along the axial direction of the chord 1 to be reinforced, causing the wire ropes 5 at the two nodes to be stretched towards each other. In this embodiment, a wire rope type electric hoist 7 is used to apply prestress.

[0022] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A chord reinforcement method based on prestressed anchor cable method, characterized in that, Includes the following: Step 1): Identify the chord members to be reinforced; Step 2): Install steel wire ropes at the upper chord node and the lower chord node of the chord to be reinforced; Step 3): Fix the ends of the wire rope at the upper chord node and the lower chord node to the corresponding hooks respectively; Step 4): Use an electric hoist to apply tension to the two hooks along the axis of the chord to be reinforced, so that the two wire ropes are pulled towards each other.

2. The chord reinforcement method based on prestressed anchor cable method according to claim 1, characterized in that: Between the steel wire ropes, rubber pads are first installed at the nodes of the chords to be reinforced, so that the rubber pads wrap around the chords to be reinforced in the circumferential direction, and then the steel wire ropes are sleeved on the outside of the rubber pads.

3. The chord reinforcement method based on prestressed anchor cable method according to claim 2, characterized in that: The rubber pad is fixed with bolts.

4. The chord reinforcement method based on prestressed anchor cable method according to claim 2, characterized in that: The thickness of the rubber pad is not less than 10mm.

5. The chord reinforcement method based on prestressed anchor cable method according to claim 1, characterized in that: The steel wire rope needs to be wrapped around the chord to be reinforced several times during installation.

6. The chord reinforcement method based on prestressed anchor cable method according to claim 1, characterized in that: The end of the wire rope is fixed to the buckle, and then the buckle is put onto the hook.

7. A chord reinforcement method based on prestressed anchor cable method according to claim 6, characterized in that: The fastener is a U-shaped fastener.

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