Multi-gradient energy consumption type transmission tower anti-seismic connection reinforcing joint

Abstract

The invention discloses a multi-gradient energy consumption type transmission tower anti-seismic connection reinforcing node, and relates to the technical field of transmission project anti-seismic, the multi-gradient energy consumption type transmission tower anti-seismic connection reinforcing node comprises a transmission tower body and a transmission tower cross arm arranged on the transmission tower body, and four composite energy consumption devices are arranged on the connection node of the transmission tower body and the transmission tower cross arm. A composite steel strand assembly is arranged between the two composite energy dissipation devices arranged diagonally, and each composite energy dissipation device comprises a friction unit and a viscous unit arranged on the outer side of the friction unit. A three-stage energy dissipation mechanism of center steel strand force bearing, peripheral memory alloy wire energy dissipation and friction-viscous composite damping is adopted, earthquake energy is consumed step by step through memory alloy wire hyperelastic deformation, friction plate sliding and viscous damper rigid limiting, broadband loads are covered, large earthquake displacement is limited, a main body structure is effectively protected, and the service life of the device is prolonged. The method is suitable for anti-seismic reinforcement of power transmission lines in earthquake-prone areas.

Description

Technical Field

[0001] The present invention relates to the technical field of earthquake resistance of power transmission projects, and in particular to an earthquake-resistant connection reinforcement node for a multi-gradient energy-dissipating power transmission tower. Background Art

[0002] Transmission tower connection nodes are mostly rigidly welded or bolted, which can easily lead to cracking or even collapse of the tower due to stress concentration under earthquake loads.

[0003] In the existing technology, single damping such as rubber damping or viscous damping is usually introduced at the node. However, the introduction of single damping such as rubber damping or viscous damping has certain defects, which seriously restricts its reliability and durability in earthquake-prone areas.

[0004] First, a single damper can only dissipate energy for seismic waves of a specific frequency and cannot cover broadband seismic loads, resulting in poor scenario adaptability of the connection node; second, traditional nodes lack a graded energy dissipation mechanism, and the concentrated release of seismic energy can easily lead to damper overload failure, resulting in insufficient energy dissipation efficiency during actual application; finally, without a rigid limiting structure, the connection node may fall off during a major earthquake, resulting in a lack of displacement control and difficulty in coping with multi-frequency aftershock impacts.

[0005] The above defects collectively result in traditional nodes facing the risk of being usable in small earthquakes, damaged in medium earthquakes, and collapsed in large earthquakes in real earthquake scenarios. Especially for lifeline projects such as high-voltage transmission lines, node failure can cause regional power outages and significantly increase post-earthquake repair costs.

[0006] Therefore, a multi-gradient energy dissipation type transmission tower seismic connection reinforcement node is provided to solve the above problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a multi-gradient energy dissipation type seismic connection reinforcement node for transmission towers, which realizes multi-gradient energy dissipation through a composite structure of central load-bearing, peripheral energy dissipation and rigid limitation, and consumes seismic energy step by step through a three-stage energy dissipation mechanism, thereby improving the seismic performance and durability of the transmission towers.

[0008] To achieve the above-mentioned objectives, the present invention provides a multi-gradient energy-dissipating type seismic connection reinforcement node for a transmission tower, comprising a transmission tower body and a transmission tower crossarm arranged on the transmission tower body. A composite energy-dissipating device is provided at the connection node between the transmission tower body and the transmission tower crossarm. Four composite energy-dissipating devices are provided, and a composite steel strand assembly is provided between two diagonally arranged composite energy-dissipating devices. The composite energy-dissipating device comprises a friction unit and a viscous unit arranged outside the friction unit.

[0009] Preferably, the viscous unit is configured as a silicone oil damper, a first ear plate is provided on the friction unit, the silicone oil damper includes a piston rod and a damper housing arranged outside the piston rod, one end of the piston rod is fixedly connected to the composite steel strand assembly, the other end of the piston rod is provided with a piston head, the piston head is arranged inside the damper housing, and the other end of the damper housing is fixedly connected to the first ear plate through a pin shaft.

[0010] Preferably, a high-strength sealing ring is provided between the damper housing and the piston rod, an adjusting oil storage chamber is provided at one end of the damper housing close to the first ear plate, a control valve is provided at one end of the adjusting oil storage chamber close to the piston head, and silicone oil is provided in the cavity between the piston rod and the control valve.

[0011] Preferably, a damping hole is provided on the piston head, the diameter of the damping hole is set to 2 mm, the maximum limit displacement of the piston rod is set to 50 mm, and the diameter of the cavity between the piston rod and the control valve is set to 50 mm.

[0012] Preferably, the friction unit is configured as a copper-based friction plate, a second ear plate is provided on the connection node between the transmission tower body and the transmission tower cross arm, the copper-based friction plate and the second ear plate are connected by pre-tightening bolts, and two copper-based friction plates are provided.

[0013] Preferably, the pre-tightening force adjustment range of the pre-tightening bolt is set to 5kN-20kN, the initial pre-tightening force between the copper-based friction plate and the second ear plate is set to 10kN, the surface of the copper-based friction plate is plated with molybdenum disulfide, the friction coefficient of the copper-based friction plate is set to 0.35, and the floating range of the friction coefficient is set to ±0.05.

[0014] Preferably, the composite steel strand assembly includes a central steel strand and a memory alloy energy-absorbing wire wound on the surface of the central steel strand, a shape memory polymer adhesive is provided in the gap between the central steel strand and the memory alloy energy-absorbing wire, and the central steel strand and the memory alloy energy-absorbing wire are fixedly connected by the shape memory polymer adhesive.

[0015] Preferably, the diameter of the central steel strand is set to 10 mm, the memory alloy energy dissipation wire adopts Ni-Ti alloy energy dissipation wire, the phase change temperature of the Ni-Ti alloy energy dissipation wire is set to 25°C, the winding angle of the Ni-Ti alloy energy dissipation wire is set to 45°, and the pitch of the Ni-Ti alloy energy dissipation wire is set to 20 mm.

[0016] Therefore, the present invention adopts the above-mentioned multi-gradient energy dissipation type transmission tower seismic connection reinforcement node, which has the following beneficial effects:

[0017] (1) This scheme has multi-gradient energy dissipation efficiency. The three-stage energy dissipation mechanism can cover 0.1-20Hz broadband seismic waves, and the energy dissipation efficiency is increased by more than 60% compared with a single damping node.

[0018] (2) This solution can achieve adaptive frequency regulation. The superelastic properties of the memory alloy wire can adaptively adjust the energy consumption range with temperature, and the performance is stable in an environment of -20℃ to 50℃.

[0019] (3) This solution is more convenient to maintain, and the shape memory polymer adhesive supports heating and reshaping, which can quickly repair the fatigue deformation of the memory alloy wire;

[0020] (4) The displacement control of this scheme is more reliable. The viscous damper limits the displacement of a large earthquake to no more than 50 mm, which is 50% less than the displacement of the traditional flexible node and can effectively prevent the tower from toppling.

[0021] The method scheme of the present invention is further described in detail below through the drawings and examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a multi-gradient energy dissipation type transmission tower seismic connection reinforcement node of the present invention;

[0023] Figure 2 is a cross-sectional view of the composite steel strand assembly of the present invention;

[0024] Figure 3 is a cross-sectional view of the copper-based friction plate of the present invention;

[0025] Figure 4 is a cross-sectional view of the silicone oil damper of the present invention;

[0026] Figure 5 Schematic diagram of the three-stage energy consumption curve of the present invention.

[0027] Among them: 1. Transmission tower body; 2. Transmission tower crossarm; 3. Composite energy dissipation device; 4. Composite steel strand assembly; 5. Silicone oil damper; 6. First ear plate; 7. Piston rod; 8. Damper housing; 9. Piston head; 10. Pin; 11. High-strength sealing ring; 12. Adjusting oil storage chamber; 13. Control valve; 14. Silicone oil; 15. Damping hole; 16. Copper-based friction plate; 17. Second ear plate; 18. Pre-tightening bolt; 19. Center steel strand; 20. Memory alloy energy dissipation wire; 21. Shape memory polymer adhesive. DETAILED DESCRIPTION

[0028] The method scheme of the present invention is further described below through the drawings and examples.

[0029] Unless otherwise defined, technical terms or scientific terms used in the present invention shall have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

[0030] The words “include” or “comprising” and similar words used in the present invention mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of also including other elements. The orientation or position relationship indicated by the terms “inside”, “outside”, “upper”, “lower”, etc. is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention. When the absolute position of the described object changes, the relative position relationship may also change accordingly. In the present invention, unless otherwise clearly stipulated and limited, the terms such as “attachment” should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral whole; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0031] Example

[0032] like Figure 1-Figure 5 As shown, the present invention provides a multi-gradient energy dissipation type transmission tower seismic connection reinforcement node, including a transmission tower body 1 and a transmission tower cross arm 2 arranged on the transmission tower body 1, a composite energy dissipation device 3 is provided at the connection node between the transmission tower body 1 and the transmission tower cross arm 2, four composite energy dissipation devices 3 are provided, and a composite steel strand assembly 4 is provided between two diagonally arranged composite energy dissipation devices 3, and the composite energy dissipation device 3 includes a friction unit and a viscous unit arranged outside the friction unit.

[0033] The viscosity unit is set as a silicone oil damper 5, and a first ear plate 6 is provided on the friction unit. The silicone oil damper 5 includes a piston rod 7 and a damper housing 8 arranged outside the piston rod 7. One end of the piston rod 7 is fixedly connected to the composite steel strand assembly 4, and the other end of the piston rod 7 is provided with a piston head 9. The piston head 9 is arranged inside the damper housing 8, and the other end of the damper housing 8 is fixedly connected to the first ear plate 6 through a pin shaft 10.

[0034] A high-strength sealing ring 11 is provided between the damper housing 8 and the piston rod 7. An adjusting oil storage chamber 12 is provided at the end of the damper housing 8 close to the first ear plate 6. A control valve 13 is provided at the end of the adjusting oil storage chamber 12 close to the piston head 9. Silicone oil 14 is provided in the cavity between the piston rod 7 and the control valve 13.

[0035] A damping hole 15 is provided on the piston head 9. The diameter of the damping hole 15 is set to 2 mm. The damping coefficient increases nonlinearly with the increase of displacement, providing rigid support during large earthquakes. The maximum limit displacement of the piston rod 7 is set to 50 mm, and the diameter of the cavity between the piston rod 7 and the control valve 13 is set to 50 mm.

[0036] The friction unit is set as a copper-based friction plate 16. A second ear plate 17 is set at the connection node between the transmission tower body 1 and the transmission tower cross arm 2. The copper-based friction plate 16 and the second ear plate 17 are connected by pre-tightening bolts 18. There are two copper-based friction plates 16. When the seismic load exceeds the threshold, sliding energy consumption is triggered.

[0037] The pre-tightening force adjustment range of the pre-tightening bolt 18 is set to 5kN-20kN, the initial pre-tightening force between the copper-based friction plate 16 and the second ear plate 17 is set to 10kN, the surface of the copper-based friction plate 16 is plated with molybdenum disulfide, the friction coefficient of the copper-based friction plate 16 is set to 0.35, and the floating range of the friction coefficient is set to ±0.05.

[0038] The composite steel strand assembly 4 includes a central steel strand 19 and a shape memory alloy energy dissipation wire 20 wound around the surface of the central steel strand 19. A shape memory polymer adhesive 21 is provided in the gap between the central steel strand 19 and the shape memory alloy energy dissipation wire 20. The central steel strand 19 and the shape memory alloy energy dissipation wire 20 are fixedly connected by the shape memory polymer adhesive 21. The shape memory polymer adhesive 21 fixes the relative position of the central steel strand 19 and the shape memory alloy energy dissipation wire 20 at room temperature, and can restore plasticity by heating at 60°C to facilitate maintenance and adjustment.

[0039] The diameter of the central steel strand 19 is set to 10 mm. The yield strength of the 10 mm central steel strand 19 is not less than 1670 MPa, and it serves as the main load-bearing member to transmit the axial load.

[0040] The memory alloy energy dissipation wire 20 is a Ni-Ti alloy energy dissipation wire, the winding angle of the Ni-Ti alloy energy dissipation wire is set to 45°, the pitch of the Ni-Ti alloy energy dissipation wire is set to 20 mm, and the phase transition temperature of the Ni-Ti alloy energy dissipation wire is set to 25°C, and absorbs seismic energy through superelastic deformation.

[0041] In actual application, a high-strength central steel strand 19 with a diameter of 10 mm is first passed through a spiral forming die, and a Ni-Ti alloy energy-dissipating wire is synchronously wound around it. A molten shape memory polymer adhesive 21 at 60°C is injected into the gap using a syringe, and after cooling, an integrated composite structure is formed.

[0042] Then, a second lug plate 17 is welded to the corresponding position of the transmission tower body 1 and the transmission tower cross arm 2, with bolt holes reserved. Two copper-based friction plates 16 with molybdenum disulfide coating on their surfaces are fixed to the second lug plate 17 via pre-tightening bolts 18. A torque wrench is used to adjust the pre-tightening bolts 18 to the designed clamping force, for example, 15kN, to ensure that the initial friction force of the friction plates matches the expected energy consumption threshold.

[0043] Pass both ends of the composite steel strand assembly 4 through the composite energy dissipation device 3 set at the diagonal position, fix them through anchors, connect the silicone oil damper 5 to the first ear plate 6 through the pin 10, connect the end of the piston rod 7 to the steel strand anchor, and complete the node installation.

[0044] In this embodiment, a multi-gradient energy dissipation type transmission tower seismic connection reinforcement node has a three-stage mechanical response mechanism of elasticity, energy dissipation, and rigid support, specifically including the following stages:

[0045] (1) Elastic stage: only the central steel strand 19 is stressed, the memory alloy energy dissipation wire 20 remains in an elastic state, and the node stiffness is close to a rigid connection;

[0046] (2) Energy dissipation stage: The memory alloy energy dissipation wire 20 enters the superelastic deformation stage, and the copper-based friction plate 16 begins to slide, and the two work together to consume seismic energy;

[0047] (3) Rigid support stage: The piston rod 7 of the silicone oil damper 5 is fully extended, and the throttling effect of the damping hole 15 provides rigid limitation to avoid node failure.

[0048] like Figure 5 As shown, during the performance testing phase, a vibration table test was conducted to simulate a 7-degree earthquake condition. In the elastic phase, the load range was 0-10%, the displacement was no more than 5 mm, and the stress and strain showed a linear relationship. In the energy dissipation phase, the load range was 10%-80%, the strain of the memory alloy energy dissipation wire 20 reached 8%, the slip of the copper-based friction plate 16 was 10 mm-30 mm, and the peak energy dissipation power reached 500 kN·m / s. In the rigid support phase, the load range was greater than 80%, the stroke of the piston rod 7 of the silicone oil damper 5 reached 40 mm, the displacement was stable within 50 mm, and no visible damage was found on the main body of the transmission tower.

[0049] Therefore, the present invention adopts the above-mentioned multi-gradient energy-dissipating type transmission tower seismic connection reinforcement node, and adopts a three-stage energy dissipation mechanism of central steel strands bearing load, peripheral memory alloy wire energy dissipation, and friction-viscous composite damping. Through the superelastic deformation of the memory alloy wire, the sliding of the friction plate, and the rigid limitation of the viscous damper, the seismic energy is consumed step by step, covering a wide range of loads and limiting large earthquake displacements, effectively protecting the main structure, and is suitable for seismic reinforcement of transmission lines in areas prone to earthquakes.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the method scheme of the present invention and not to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary method personnel in this field should understand that they can still modify or replace the method scheme of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified method scheme to deviate from the spirit and scope of the method scheme of the present invention.

Claims

1. A multi-gradient energy dissipation type transmission tower seismic connection reinforcement node, characterized in that: It includes a transmission tower body and a transmission tower cross arm arranged on the transmission tower body. A composite energy dissipation device is arranged at the connection node between the transmission tower body and the transmission tower cross arm. There are four composite energy dissipation devices. A composite steel strand assembly is arranged between two diagonally arranged composite energy dissipation devices. The composite energy dissipation device includes a friction unit and a viscosity unit arranged outside the friction unit.

2. A multi-gradient energy dissipation type transmission tower seismic connection reinforcement node according to claim 1, characterized in that: The viscous unit is configured as a silicone oil damper, and a first ear plate is provided on the friction unit. The silicone oil damper includes a piston rod and a damper housing arranged outside the piston rod. One end of the piston rod is fixedly connected to the composite steel strand assembly, and the other end of the piston rod is provided with a piston head, which is arranged inside the damper housing. The other end of the damper housing is fixedly connected to the first ear plate through a pin shaft.

3. The multi-gradient energy dissipation type transmission tower seismic connection reinforcement node according to claim 2, characterized in that: A high-strength sealing ring is provided between the damper housing and the piston rod, an adjusting oil storage chamber is provided at one end of the damper housing close to the first ear plate, a control valve is provided at one end of the adjusting oil storage chamber close to the piston head, and silicone oil is provided in the cavity between the piston rod and the control valve.

4. The multi-gradient energy dissipation type transmission tower seismic connection reinforcement node according to claim 3, characterized in that: A damping hole is provided on the piston head, the diameter of the damping hole is set to 2mm, the maximum limit displacement of the piston rod is set to 50mm, and the diameter of the cavity between the piston rod and the control valve is set to 50mm.

5. The multi-gradient energy dissipation type transmission tower seismic connection reinforcement node according to claim 1, characterized in that: The friction unit is set as a copper-based friction plate. A second ear plate is set at the connection node between the transmission tower body and the transmission tower cross arm. The copper-based friction plate and the second ear plate are connected by pre-tightening bolts. There are two copper-based friction plates.

6. The multi-gradient energy dissipation type transmission tower seismic connection reinforcement node according to claim 5, characterized in that: The preload adjustment range of the preload bolt is set to 5kN-20kN, the initial preload between the copper-based friction plate and the second ear plate is set to 10kN, the surface of the copper-based friction plate is plated with molybdenum disulfide, the friction coefficient of the copper-based friction plate is set to 0.35, and the floating range of the friction coefficient is set to ±0.

05.

7. The multi-gradient energy dissipation type transmission tower seismic connection reinforcement node according to claim 1, characterized in that: The composite steel strand assembly includes a central steel strand and a memory alloy energy-dissipating wire wound on the surface of the central steel strand. A shape memory polymer adhesive is provided in the gap between the central steel strand and the memory alloy energy-dissipating wire, and the central steel strand and the memory alloy energy-dissipating wire are fixedly connected by the shape memory polymer adhesive.

8. The multi-gradient energy dissipation type transmission tower seismic connection reinforcement node according to claim 7, characterized in that: The diameter of the central steel strand is set to 10 mm, the memory alloy energy dissipation wire adopts Ni-Ti alloy energy dissipation wire, the phase change temperature of the Ni-Ti alloy energy dissipation wire is set to 25°C, the winding angle of the Ni-Ti alloy energy dissipation wire is set to 45°, and the pitch of the Ni-Ti alloy energy dissipation wire is set to 20 mm.

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