Hierarchical triggered GIL vertical corner two-way seismic response control system

Abstract

The application discloses a hierarchical trigger GIL vertical corner two-way seismic response control system, which comprises displacement transmission modules symmetrically arranged on both sides of the vertical corner and a core energy dissipation module installed on the ground. The displacement transmission module is fixed to the horizontal sections on both sides of the GIL corner through a fixing member, one end of a cable is connected to the fixing member, the other end is connected to the core energy dissipation module through a support guide wheel and a ground guide wheel, and GIL horizontal displacement is transmitted to the core energy dissipation module. The core energy dissipation module is composed of a pre-tightening return device, a threshold trigger mechanism and a mass-inertial container in series. The application realizes two-way control of the GIL vertical corner in the counterclockwise and clockwise directions through symmetric cables and pre-tightening design, and the mass-inertial container is triggered in stages through the threshold trigger mechanism under normal operation and different intensity earthquakes. Under the synergistic action of damping, inertial element and adjustable stiffness unit, hierarchical vibration control is realized. The control system can be directly installed on the GIL pipeline and existing support without modifying the original structure, and is convenient to install and maintain.

Description

Technical Field

[0001] This invention relates to the field of seismic design of high-voltage power transmission equipment, and in particular to a bidirectional seismic response control system for vertical rotation of a graded-triggered gas-insulated metal-enclosed transmission line (GIL) device. Background Technology

[0002] GIL (Gas-Insulated Line) pipelines are widely used due to their advantages such as large transmission capacity, high reliability, and minimal environmental impact. In practical engineering, GIL pipelines inevitably require vertical bends to adapt to the terrain or avoid buildings, and these areas are often weak points in terms of seismic resistance.

[0003] Because GILs exhibit typical nonlinear characteristics and lack effective displacement constraints and buffering mechanisms, excessive relative displacement can easily occur between the horizontal segments on both sides of the vertical corner during an earthquake. This can lead to clockwise or counterclockwise rotation of the vertical corner, resulting in structural failure due to shell strength degradation and electrical failure due to inner conductor pull-out. Current standards primarily focus on the seismic design of support-pipeline systems from a structural safety perspective, only checking the stress of critical sections under the most unfavorable conditions. They lack specific control over rotation at vertical corners, failing to guarantee the integrity of electrical equipment functions under seismic loading.

[0004] Therefore, existing technologies have failed to effectively control the vertical rotation of the GIL (Gas Injector Line). Considering the different requirements of normal operation and seismic action, it is necessary to ensure normal pipeline displacement during normal operation and low-intensity earthquakes, and to effectively control excessive vertical rotation during moderate and high-intensity earthquakes. Therefore, inventing a simple-to-install, reliable, graded-trigger bidirectional seismic response control system for the vertical rotation of the GIL is of significant practical importance. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention aims to provide a graded triggering GIL vertical rotation bidirectional seismic response control system for controlling the relative displacement of the horizontal segments on both sides of the vertical rotation angle and the rotation of the vertical rotation angle.

[0006] This invention is achieved through the following technical solution:

[0007] A graded triggering bidirectional seismic response control system for vertical rotation of a GIL pipeline includes displacement transmission modules symmetrically arranged on both sides of the vertical rotation of the GIL pipeline and a core energy dissipation module installed on the ground.

[0008] The displacement transmission module includes: a first fixing member and a second fixing member, respectively installed on the horizontal sections on both sides of the GIL; a first support guide wheel and a second support guide wheel, respectively installed on the existing pipe supports on both sides of the GIL corner; a first ground guide wheel and a second ground guide wheel, respectively installed on the ground foundation on both sides of the core energy consumption module; a first cable, one end connected to the first fixing member, and the other end sequentially wrapped around the first support guide wheel and the first ground guide wheel, and then connected to the first input end of the core energy consumption module and connected to the pre-tensioning rewinder on that side; a second cable, one end connected to the second fixing member, and the other end sequentially wrapped around the second support guide wheel and the second ground guide wheel, and then connected to the second input end of the core energy consumption module and connected to the pre-tensioning rewinder on that side.

[0009] The core energy-consuming module consists of two pre-tensioning rewinders, a threshold triggering mechanism, and an inertial container connected in series. The two pre-tensioning rewinders are independently connected to the first and second cables in the displacement transmission module, respectively, to provide and maintain the initial tension of the two cables. The threshold triggering mechanism monitors the displacement signal transmitted by the cables and outputs a signal according to a preset threshold. The inertial container, connected in series with the threshold triggering mechanism, includes a damping element, an inertial capacitance element, and an adjustable stiffness unit.

[0010] Preferably, the first and second fixing members are clamps, and a high friction coefficient padding layer is adhered to the inner side of the fixing member. The padding layer is made of rubber or polyurethane. The fixing member has stiffening ribs at the ear plate part connected to the cable and is hinged to the cable end head of the cable by a pin.

[0011] Preferably, the first bracket guide wheel and the second bracket guide wheel are integrated components, including a support composed of two parallel side plates welded to a horizontal base plate. The side plates are provided with coaxial offset shaft holes, and the wheel axle is installed in the shaft holes. The guide wheel contacts the cable and changes the direction of the cable. An anti-slip friction layer is provided between the horizontal base plate and the pipe support, and it is locked to the pipe support by fasteners.

[0012] The control system achieves the following hierarchical operating modes through the above structure:

[0013] Under normal operation and low-intensity earthquakes, when the relative horizontal displacement on both sides of the vertical turning angle does not exceed the first threshold, the threshold triggering mechanism is in an untriggered state, the inertial container does not start, and the control system meets the normal displacement requirements of the pipeline. Under moderate-intensity earthquakes, when the relative horizontal displacement exceeds the first threshold, the threshold triggering mechanism is overcome, and the damping element and inertial capacitance element intervene to provide energy dissipation and inertial capacitance effect. Under high-intensity earthquakes, when the relative horizontal displacement further exceeds the higher second threshold, the damping element and inertial capacitance element in the inertial container work fully, and the adjustable stiffness unit participates in the work to provide amplitude limiting constraint.

[0014] Compared with the prior art, the present invention has the following technical effects:

[0015] 1. This invention, by employing a symmetrical cable arrangement and a pre-tensioned rewinding design, ensures that the force transmission path remains taut regardless of whether the device rotates clockwise or counterclockwise in the vertical direction, thus achieving bidirectional control.

[0016] 2. This invention achieves an adaptive response of "no disturbance in small earthquakes and controllable in large earthquakes" through a graded triggering mechanism. Under normal operation or low-intensity earthquakes, it maintains an unconstrained movable state to meet displacement requirements. Under moderate and high-intensity earthquakes, it triggers and intervenes in stages, controlling the displacement at the vertical rotation angle through the synergistic effect of amplitude limiting constraints, damping energy dissipation, and inertial capacitance effect.

[0017] 3. The control system of the present invention can be installed on existing pipelines through fasteners, and the bracket guide wheel can be quickly assembled on the original pipeline support through fasteners. That is, there is no need to make modifications such as welding or drilling to the GIL body, nor is there any need to make structural modifications to the original pipeline support. It has the characteristics of simple installation and quick construction, and facilitates later inspection, maintenance and component replacement, which significantly improves the applicability of the project and the economy of the whole life cycle. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall GIL vertical rotation bidirectional seismic response control system of the present invention, which is triggered in stages.

[0019] Figure 2 for Figure 1 A schematic diagram of the GIL pipeline and the original support structure in Zhongyuan Structure.

[0020] Figure 3 for Figure 1 A partial structural diagram of the displacement transfer module.

[0021] Figure 4 This is a detailed drawing of the components for the first fastener and the high-friction coefficient bushing.

[0022] Figure 5 Detailed drawing of the components of the first bracket guide wheel and its mounting assembly, including the anti-slip friction layer and U-shaped fasteners.

[0023] Figure 6 This is a schematic diagram of the internal structure of the core energy-consuming module.

[0024] In the diagram: 1 GIL pipe; 2 First existing pipe support; 3 Second existing pipe support; 4 Core energy-consuming module; 5 First fastener; 6 Second fastener; 7 First cable; 8 Second cable; 9 First support guide wheel; 10 Second support guide wheel; 11 First ground guide wheel; 12 Second ground guide wheel; 41 Pre-tightening rewinder; 42 Threshold triggering mechanism; 43 Inertia container; 51 High friction coefficient padding layer; 91 Anti-slip friction layer; 92 U-shaped fastener; 431 Damping element; 432 Inertia capacitive element; 433 Adjustable stiffness unit. Detailed Implementation

[0025] This embodiment provides a graded triggering GIL vertical rotation bidirectional seismic response control system, such as Figures 1 to 6 As shown, the system includes a displacement transmission module and a core energy dissipation module located on the ground. The displacement transmission module is fixed to the horizontal sections on both sides of the corner of the GIL pipeline 1 via a first fixing member 5 and a second fixing member 6. A first cable 7 and a second cable 8 are connected to both sides of the core energy dissipation module 4 via a first support guide wheel 9, a first ground guide wheel 11, a second support guide wheel 10, and a second ground guide wheel 12, transmitting the horizontal displacement of the GIL to the ground core energy dissipation module. The core energy dissipation module 4 is equipped with a pre-tensioning rewinder 41 to maintain cable tension, and a threshold triggering mechanism 42 maintains system flexibility when the threshold is not reached. When the relative displacement caused by the earthquake exceeds the set threshold, the threshold triggering mechanism is activated, starting the inertia container 43. Through the coordinated action of the damping element 431, the inertia container element 432, and the adjustable stiffness unit 433, bidirectional displacement control of the GIL is achieved.

[0026] Based on the size and model of GIL pipe 1, select the appropriate first fastener 5 and second fastener 6; based on the size of the original pipe support, select the appropriate U-shaped fastener 92, and install the matching first support guide wheel 9 and second support guide wheel 10.

[0027] The displacement transmission module of the control system is used to acquire the relative horizontal displacement between the horizontal sections on both sides of GIL pipe 1 in real time. Its structure and connection relationship are as follows:

[0028] 1. Fixed and force-transmitting connection parts

[0029] like Figure 1 and Figure 3 As shown, the first fixing member 5 and the second fixing member 6 are respectively fastened to the horizontal sections on both sides of the bend of the GIL pipe 1 by high-strength bolts, preferably using clamps to achieve stable fixation. The specific structure of the fixing member 5 is as follows: Figure 4As shown, its inner side has a high-friction coefficient padding layer 51, preferably made of high-friction materials such as rubber or polyurethane, to establish reliable static friction between the fastener and the outer shell of the GIL pipe 1, and to transmit horizontal displacement. The structure of the second fastener 6 is the same as that of the first fastener 5, and it also has the same padding layer on its inner side. Both fasteners have stiffening ribs at the ear plate part where they connect with the cables, and are hinged to the cable heads at the ends of the first cable 7 and the second cable 8 by pins, in order to resist the concentrated shear force and bending moment of the cables during the force transmission process.

[0030] 2. Force transmission path

[0031] like Figure 1 and Figure 3 As shown, the system has two independent and symmetrical force transmission paths. The first force transmission path connects one end of the first cable 7 to the first fixing member 5, and the other end passes sequentially around the first support guide wheel 9 installed on the first original pipe support 2 and the first ground guide wheel 11 installed on the ground foundation on the left side of the core energy consumption module 4 before connecting to the left input end of the core energy consumption module 4. The second force transmission path connects one end of the second cable 8 to the second fixing member 6, and the other end passes sequentially around the second support guide wheel 10 installed on the second original pipe support 3 and the second ground guide wheel 12 installed on the ground foundation on the right side of the core energy consumption module 4 before connecting to the right input end of the core energy consumption module 4. Both the first cable 7 and the second cable 8 include a cable body and a cable head. The cable body is preferably made of steel strand with a diameter of Φ[10-18]mm, and the cable head is firmly connected to the cable body by cold pressing anchoring or hot casting anchoring process.

[0032] 3. Key Turning Points

[0033] like Figure 3 and Figure 5 As shown, the first support guide wheel 9 is installed on the first existing pipe support 2. It is an integrated component, including a guide wheel support, axle, and wheel body. The guide wheel support is welded from two upper parallel side plates and a lower horizontal base plate. The two side plates have corresponding coaxial offset shaft holes, and the guide wheel is installed in the pair of shaft holes through the axle. This design, on the one hand, allows the first cable 7 to effectively avoid the first existing pipe support 2 below after deflection, ensuring a smooth and interference-free force transmission path; on the other hand, it makes the direction of the cable force on the first support guide wheel 9 more consistent with the axis of the side plate, reducing the bending stress on the side plate and improving the structural reliability and durability under long-term service and strong earthquakes. During installation, an anti-slip friction layer 91 is set between the horizontal base plate and the first existing pipe support 2, and the first support guide wheel 9 is firmly locked to the first existing pipe support 2 by U-shaped fasteners 92. The structure and installation method of the second support steering wheel 10 are the same as those of the first support steering wheel 9, and they are symmetrically arranged.

[0034] The core energy-consuming modules of the control system and their connection relationships are as follows:

[0035] like Figure 6 As shown, the core energy-consuming module 4 integrates a pre-tension rewinder 41, a threshold triggering mechanism 42, and an inertia container 43. The pre-tension rewinder 41 consists of two independent drums, used to wind up the first cable 7 and the second cable 8, respectively. The cable bodies of the first cable 7 and the second cable 8 near one end of the core energy-consuming module 4 are respectively wound and anchored to the corresponding drums, or reliably connected via special clamps. The pre-tension rewinder 41 provides and maintains an adjustable initial tension for the two cables by driving the drums to rotate. The threshold triggering mechanism 42 monitors the relative motion transmitted by the cables in real time and controls the operation of the inertia container 43 according to a set threshold. The inertia container 43 includes a damping element 431, an inertial capacity element 432, and an adjustable stiffness unit 433 connected in parallel or series. Its activation is controlled by the threshold triggering mechanism 42 and is used to provide amplitude limiting constraints when necessary.

[0036] The working principle of this control system is as follows:

[0037] Under normal operation and low-intensity earthquakes, when the GIL pipeline experiences displacement due to thermal expansion and contraction or earthquakes, and this displacement does not exceed the first-level response threshold, the threshold triggering mechanism 42 remains in an inactive state, the inertial container 43 does not operate, and the control system maintains flexibility to meet the normal displacement requirements of the pipeline. At this time, only the pre-tensioned rewinder 41 provides flexible constraints, which does not affect the normal operation of the pipeline and avoids applying unnecessary constraint forces to the pipeline. Under moderate-intensity earthquakes, the earthquake causes the relative displacement of the horizontal sections on both sides to exceed the first threshold. The threshold triggering mechanism 42 is overcome, and the damping element 431 and the inertial capacitive element 432 in the inertial container 43 are activated to dissipate earthquake energy. Under high-intensity earthquakes, the relative displacement of the horizontal sections further increases and exceeds a higher second threshold. The adjustable stiffness unit 433 in the inertial container 43 will then participate in the operation, working in conjunction with the damping element 431 and the inertial capacitive element 432 to provide amplitude limiting constraints and prevent uncontrolled displacement. Regardless of whether the earthquake causes the horizontal sections on both sides of GIL pipeline 1 to move relatively far apart or relatively close together, the above changes can be effectively transmitted to the core energy dissipation module 4 through the independent force transmission paths on both sides, triggering the corresponding graded response, and realizing the control of the clockwise or counterclockwise rotation of the vertical angle caused by the displacement of the horizontal sections on both sides of the vertical angle.

[0038] Through the modular and graded triggering design described above, this invention significantly improves the safety of GIL pipelines at vertical corners under moderate and high-intensity earthquakes, while ensuring that GIL pipelines can operate normally during daily work and low-intensity earthquakes. It controls the rotation at vertical corners and ensures the integrity of the GIL structure and electrical functions.

[0039] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A graded-triggered GIL vertical rotation bidirectional seismic response control system, characterized in that, include: The displacement transmission module includes a first force transmission path and a second force transmission path arranged on both sides of the vertical corner, which are used to transmit the relative horizontal displacement between the horizontal segments on both sides of the GIL vertical corner to the core energy consumption module. The core energy consumption module is fixedly installed on the ground foundation and located near the GIL vertical corner. It is used to implement graded triggering based on the relative motion input at both ends and to perform bidirectional control of the rotation of the vertical corner.

2. The control system according to claim 1, characterized in that, Both the first and second force transmission paths consist of: a fixing member, which is fixed to the horizontal sections on both sides of the vertical corner; a cable, one end of which is connected to the corresponding fixing member; and a guide wheel assembly, which cooperates with the cable. The guide wheel assembly is used to guide the force transmission direction of the corresponding cable, so that its free end is connected to the first input end and the second input end of the core module, respectively.

3. The control system according to claim 2, characterized in that, The inner side of the fastener is provided with a high friction coefficient padding layer, and the ear plate part connected to the cable is provided with stiffening ribs.

4. The control system according to claim 2, characterized in that, The guide wheel assembly includes: a support guide wheel, comprising a first support guide wheel and a second support guide wheel respectively mounted on a first existing pipe support and a second existing pipe support; and a ground guide wheel, comprising a first ground guide wheel and a second ground guide wheel respectively mounted on the ground foundations on both sides of the core energy-consuming module; wherein, the free end of the cable of the first force transmission path passes through the first support guide wheel and the first ground guide wheel in sequence, and is connected to the first input end of the core energy-consuming module; the free end of the cable of the second force transmission path passes through the second support guide wheel and the second ground guide wheel in sequence, and is connected to the second input end of the core energy-consuming module.

5. The control system according to claim 4, characterized in that, The first bracket guide wheel and the second bracket guide wheel include guide wheel supports with offset shaft holes.

6. The control system according to claim 1, characterized in that, The core energy-consuming module includes: a pre-tensioning rewinder, used to provide and maintain initial tension for the cables in the displacement transmission module; a threshold triggering mechanism, used to monitor the displacement signal transmitted by the cables; and an inertial container, whose activation is controlled by the multi-stage threshold triggering mechanism. The inertial container includes a damping element, an inertial capacitance element, and an adjustable stiffness unit, which are connected in parallel, series, or mixed manner.

7. The control system according to claim 6, characterized in that, The graded response is as follows: Under normal operation and low-intensity earthquakes, when the relative horizontal displacement does not exceed the first threshold, the threshold triggering mechanism is in a non-triggered state, the inertial container does not start, and the control system remains in an unconstrained movable state to meet the normal displacement requirements of the pipeline; Under moderate-intensity earthquakes, when the relative horizontal displacement exceeds the first threshold, the threshold triggering mechanism is overcome, and the damping element and inertial capacitive element intervene to provide energy dissipation and inertial capacitive effects. Under high-intensity earthquakes, when the relative horizontal displacement exceeds a higher second threshold, the damping element and the inertial capacitance element work fully, and the adjustable stiffness unit participates in providing amplitude limiting constraints.

8. The control system according to claim 6, characterized in that, The bidirectional control specifically means that when the horizontal segments on both sides of the vertical corner segment move away from each other or move closer to each other, the displacement transmission module and the pre-tensioning rewinder ensure that the cables remain taut and continuously transmit tension, thereby achieving bidirectional displacement control of the vertical corner's clockwise or counterclockwise rotation.

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