A safety protection device for highway underpassing ultra-high voltage power line and a construction method thereof

Abstract

The highway underpass ultra-high voltage power line safety protection device and construction method can make the ultra-high voltage cable in different forms during fixing at different stages, and can fix each ultra-high voltage cable very quickly and conveniently, can conveniently check the appearance of the ultra-high voltage cable when starting to fix the ultra-high voltage cable, and can make the ultra-high voltage cable in an unfolded and laid state when in a suspended state, ensure that the lower end of the ultra-high voltage cable has a high enough construction space and the ultra-high voltage cable is stably and reliably suspended, meanwhile, the protection device realizes the detachable and repeated use of the safety protection device, saves cost and makes the underground construction with the ultra-high voltage cable safer, and can clearly check whether the surface of each ultra-high voltage cable is damaged when the ultra-high voltage cable is suspended, further improving construction safety.

Description

Technical Field

[0001] This invention relates to the field of highway construction, and in particular to a safety protection device and construction method for highways passing under ultra-high voltage power lines. Background Technology

[0002] With the decreasing availability of land resources, the construction of existing highways must always consider how to ensure the rapid passage of vehicles while also allowing pedestrians and vehicles to pass on the ground. As a result, the construction of highways is increasingly characterized by the intersection of two expressways or the intersection of expressways and general roads. The construction of such elevated expressways cannot be separated from the support of bridge piers. In order to ensure effective support for the expressway, the construction of bridge piers generally involves underground construction. During the underground construction process, it is inevitable to encounter deeply buried ultra-high voltage power lines. If the power lines need to be relocated, this will undoubtedly require a considerable investment and greatly increase the difficulty of construction. In existing technologies, such as patent document 1, a method for in-situ suspension protection of high-voltage cable power channels is disclosed. During underground construction, several pipe supports 1 are placed outside the high-voltage cable 2, and adjacent pipe supports 1 cooperate to form a rectangular array. The high-voltage cable is then fixed to a Bailey bridge 5 by a load-bearing rod 3 and steel strands 6. Although this suspension protection method can avoid damage to the high-voltage cable, because it forms a stacked rectangular array of high-voltage cables 2, it is not easy to clearly and readily detect whether the high-voltage cable at the center of the rectangular array has been damaged during suspension. Furthermore, because the high-voltage cables 2 form a rectangular array, during suspension, all the high-voltage cables are concentrated together, and the steel strands 4 are the only means of suspension. This arrangement results in a relatively low working space at the lower end of the high-voltage cable, and it is also prone to swaying under external forces. If the swaying amplitude is too large, it may even cause the steel strands 4 to break. Furthermore, each pipe support is independent, and assembling them into a rectangular array is a lengthy process, undoubtedly delaying construction time. For example, Patent Document 2 discloses a suspension protection construction method for high-voltage cable pipelines traversing the middle of a large-span foundation pit. During foundation pit construction, it uses load-bearing steel wire ropes to flexibly suspend the high-voltage cable pipelines, arranging them in a "radial at both ends, parallel in the middle" configuration to evenly distribute the suspended weight on the inclined support beams. Although it proposes suspending the cable ropes by spreading them parallel, the suspension of each high-voltage cable pipe involves binding them together with the suspension steel wire rope 13 and the load-bearing steel wire rope 12. This suspension operation also requires a significant amount of time, undoubtedly delaying construction. Moreover, when lowering the high-voltage cable pipes after construction, the steel wire ropes need to be broken, further increasing labor intensity and extending construction time.

[0003] [Patent Document 1] CN110445077A;

[0004] [Patent Document 2] CN113969583A.

[0005] In summary, while existing technologies for safety protection of highways passing under ultra-high voltage (UHV) power lines employ suspending methods, securing each high-voltage cable is cumbersome. There is no readily available safety protection device that allows for rapid cable positioning and easy inspection for damage. Furthermore, the suspension of UHV cables is achieved through rope structures, which do not account for cable swaying. The rectangular cable design also limits the operational space below. Even considering a parallel laying configuration during suspension, securing the cables remains extremely complex. Therefore, this invention provides a safety protection device and construction method for highways passing under UHV power lines. This method allows for securing UHV cables in different configurations at different stages, enabling quick and convenient cable fixing. It facilitates initial cable inspection and ensures the cables are laid out flat during suspension, providing sufficient working space and stable, reliable cable suspension. Summary of the Invention

[0006] To overcome the shortcomings of existing safety protection devices and construction methods for highways passing under ultra-high voltage (UHV) power lines, this invention provides a technical solution: a safety protection device for highways passing under UHV power lines, comprising: a cable clamping frame, a retaining and hoisting frame, a suspension device, and a support beam. The cable clamping frame includes a cable clamping semi-circular arc frame, an arc frame connecting rod, and a retaining elastic element. The two ends of the arc frame connecting rod are respectively hinged to the cable clamping semi-circular arc frame, with an included angle β between two adjacent arc frame connecting rods. The retaining elastic element is connected to the arc frame connecting rod at both ends. The cable clamping semi-circular arc frame is used to accommodate the UHV cable, and the retaining elastic element maintains the included angle β unchanged after accommodating the UHV cable. This arrangement allows the UHV cables housed in the semi-circular cable clamps to be arranged in two staggered layers. This facilitates subsequent hoisting of the UHV cables and allows for easy inspection of the surface of each UHV cable for damage. When safety protection of the UHV cables is required, the cable clamps containing the UHV cables are placed inside the holding and hoisting frame, and the suspension device is installed and fixed between the support beam and the holding and hoisting frame. The suspension device clamps the holding and hoisting frame, causing the cable clamps inside the holding and hoisting frame to deform, changing the UHV cable arrangement from two staggered layers to a single layer of transverse arrangement. Finally, the suspension device allows each UHV cable to be unfolded and suspended from the lower end of the support beam.

[0007] Preferably, the cable clamping semi-circular arc frame is an elastic clamping frame with an opening facing downward and a radius greater than a semi-circular arc. When it is necessary to accommodate an ultra-high voltage cable, align it with the ultra-high voltage cable to be accommodated, then align the opening with the ultra-high voltage cable and press down to accommodate the ultra-high voltage cable in the cable clamping semi-circular arc frame.

[0008] Preferably, the retaining elastic element is a compression spring or a spring, and the included angle β is greater than 0° and less than 180°. The presence of the included angle β makes all the cable clamping semicircular arc frames on the cable clamping frame divided into upper and lower layers. In the initial state, the gap between two adjacent cable clamping semicircular arc frames in the lower layer is greater than the diameter of the upper cable clamping semicircular arc frame between two adjacent lower layer cable clamping semicircular arc frames. Thus, in the initial state, the upper layer cable clamping semicircular arc frame can also successfully clamp the UHV cable.

[0009] Preferably, the hoisting frame includes an upper retainer and a lower retainer that can move closer to and further away from each other. The upper retainer includes an upper buffer layer and a sleeve, with the sleeve disposed on both sides of the lower end of the upper buffer layer. The lower retainer includes a lower buffer layer and a sleeve rod, with the sleeve rod disposed on both sides of the upper end of the lower buffer layer. The sleeve is fitted inside the sleeve rod, and the upper buffer layer can slide freely relative to the lower retainer through the sleeve and the sleeve rod. The upper buffer layer presses against the upper end of the cable clamping frame located inside the hoisting frame.

[0010] Preferably, the upper retainer further includes a fixed seat, which is fixedly disposed at both ends of the upper buffer layer. The lower retainer further includes a suspension seat and a pulley. The suspension seat is located at both ends of the lower buffer layer. The pulley is rotatably disposed on the suspension seat. One end of the lifting rope of the suspension device is fixed to the fixed seat, then passes downward through the pulley, and then is fixed upward to the support beam.

[0011] Preferably, the suspension device further includes a winch mechanism, which is a winch or a drum, the lifting rope is wound on the winch or drum, and the winch mechanism is fixedly mounted on the support beam.

[0012] Preferably, the end of the sleeve is provided with a locking end, the lower end of the support beam is provided with a locking hole, the sleeve can penetrate the upper buffer layer, so that the locking end is inserted into the locking hole, and finally, the cable clamp is kept suspended in mid-air by the sleeve.

[0013] Preferably, the height of the sleeve is greater than or equal to the diameter of a single UHV cable. This arrangement ensures that even when the upper and lower buffer layers are squeezed together, they will not exert damaging compressive force on the UHV cable, further improving the safety of the UHV cable.

[0014] Preferably, the elastic force of the retaining elastic element is sufficient to ensure that the cable clamp retains its original shape without deformation when the retainer is placed on the cable clamp. This is to make it easier for workers to observe whether there is any damage on the surface of each ultra-high voltage cable, thereby further improving the safety of the operation.

[0015] Preferably, the support beam is provided with support legs at both ends, and the support beam is erected on the pit dug in the underground operation by means of the support legs.

[0016] Preferably, the locking hole and the locking end only need to be able to maintain relative engagement and fixation, and locking and separation can be achieved by electromagnetic lock or mechanical lock.

[0017] Preferably, the locking hole can penetrate the entire support beam, and the locking end is provided with several horizontally arranged locking holes. After the locking end is locked into the locking hole, the locking hole is exposed above the support beam. The worker can fix it by inserting the pin into the locking hole. When disassembly is required, the pin can be pulled out of the locking hole.

[0018] Preferably, the arrangement of several horizontally arranged locking holes allows for adjustment of the clamping degree of the hoisting frame, thereby allowing adjustment of the shape of the cable clamping frame.

[0019] Preferably, in order to ensure that personnel working underground are not affected by electromagnetic radiation, both the lower buffer layer and the upper buffer layer include fine metal wire mesh with an outer insulating layer.

[0020] Preferably, the method further includes a construction method for a safety protection device for a highway passing under an ultra-high voltage power line, the construction method comprising the following steps:

[0021] A. Construction environment survey and construction preparation;

[0022] Investigate and survey the underground laying depth, location, diameter, material, laying direction and surrounding environment of the UHV cable, clear the soil and rocks above and to the side of the power channel formed by the UHV cable, and erect support beams that span the power channel.

[0023] B. Preparations before hanging ultra-high voltage cables:

[0024] I. Insert the UHV cables that need to be suspended into the cable clamping semi-circular arc frame of the cable clamping frame, and carefully check whether there is any damage or breakage on the surface of the UHV cables.

[0025] II. Insert the lower buffer layer under the cable clamping frame that holds the UHV cable, and install the sleeve rods on both sides of the lower buffer layer;

[0026] III. Install the upper buffer layer with the sleeve onto the lower buffer layer, so that the sleeve is fitted onto the outside of the sleeve rod;

[0027] IV. After passing one end of the hoisting rope of the suspension device downwards around the pulleys on both sides of the lower buffer layer, pass it upwards and then fix it to the fixed seat on the side of the upper buffer layer to complete the preparation before the suspension of the UHV cable.

[0028] C. Suspension of ultra-high voltage cables:

[0029] I. Start the hoisting mechanism installed on the support beam to retract the hoisting rope, which drives the upper retainer to move downward and close to the lower retainer. The downward moving upper retainer squeezes the cable clamping frame inside the hoisting frame, causing the elastic element to deform. Finally, the semi-circular arc frames of each cable clamp change from a two-layer staggered arrangement to a single-layer planar arrangement.

[0030] II. Continue to retract the hoisting rope, which will then lift the entire hoisting frame until it is suspended in the air, thus completing the suspension of the UHV cable.

[0031] Preferably, step C further includes step III, whereby the winch mechanism continues to wind up the rope until the locking end of the lever is inserted into the locking hole of the support beam, thus completing the locking.

[0032] Preferably, the sleeve is a telescopic rod structure driven by a hydraulic cylinder.

[0033] Preferably, both ends of the retaining elastic element can be located at the upper end of the arc frame connecting rod, or the retaining elastic element can be fixed at the lower end of the arc frame connecting rod and the upper end of the cable clamping semi-circular arc frame. This arrangement ensures that the retaining elastic element will not obstruct the cable clamping semi-circular arc frame from accommodating the ultra-high voltage cable.

[0034] Preferably, the weight of the upper retainer can also be set to be larger, so that after the upper retainer is placed on the lower retainer, it slides downward due to gravity, overcoming the elastic force of the retaining elastic element, and the cable clamping semi-circular arc frame is changed from a two-layer staggered arrangement to a single-layer planar arrangement.

[0035] The beneficial effects of this invention are as follows:

[0036] 1) The safety protection device for highway underpasses of ultra-high voltage power lines of the present invention can quickly and accurately fix and suspend ultra-high voltage power lines when encountering them during underground construction, so that construction personnel will not damage or be affected by the ultra-high voltage power lines during underground construction. Furthermore, when suspending the ultra-high voltage power lines, it no longer uses a cable structure to suspend the ultra-high voltage power lines in the air, but uses a rigid connecting rod structure to ensure that the ultra-high voltage power lines are stable enough when suspended and are not easily swayed by external forces.

[0037] 2) The safety protection device for highway underpass of ultra-high voltage power lines of the present invention includes a cable clamping frame, a retaining and hoisting frame and a suspension device. They cooperate with each other. The cable clamping frame can quickly fix the ultra-high voltage cable. When the cable clamping frame initially fixes the ultra-high voltage cable, the ultra-high voltage cable is arranged in two staggered layers. When suspension hoisting is required, the cable clamping frame is set in the retaining and hoisting frame, and then the suspension device 13 is fixed on the retaining and hoisting frame. Finally, by driving the suspension device to move, the retaining and hoisting frames are clamped together, thereby squeezing the cable clamping frame. Finally, the cable clamping frame is unfolded, and the ultra-high voltage cable is arranged in a row. This allows the ultra-high voltage cable to have sufficient construction space under it when it is suspended.

[0038] 3) Furthermore, when the suspension device drives the hoisting frame to clamp together, the sleeve rod 12 inside the hoisting frame extends out and finally engages with the locking hole inside the suspension device, so that the locking end of the sleeve rod is locked. In this way, the hoisting frame is kept suspended through the sleeve rod, and the internal UHV cable can be kept very stably suspended in mid-air without worrying about the UHV cable swaying due to external forces. At the same time, the weight of the UHV cable is borne not only by the suspension device but also by the sleeve rod, which can further ensure the service life of the lifting rope in the suspension device.

[0039] 4) Furthermore, the cable clamping frame of the present invention is composed of several cable clamping semicircular arcs, arc frame connecting rods, and retaining elastic elements. The retaining elastic elements make the cable clamping frame a folding frame structure composed of several "M" shapes under normal conditions. In this way, when it is necessary to suspend the UHV cables, firstly, each UHV cable is inserted into the cable clamping semicircular arc frame and arranged in an orderly manner so that there is no obstruction between the cables. Thus, the appearance of each UHV cable can be inspected at this time to detect whether the UHV cable is damaged in time. Moreover, the opening of the cable clamping semicircular arc frame is downward. The staff only needs to press down on the UHV cable to place the UHV cable into the cable clamping frame. The cable clamping frame not only makes the fixing of the cable convenient, but also makes it easy to check whether any cable is damaged after it is fixed.

[0040] 5) Further, the retaining and hoisting frame of the present invention includes a detachable upper retaining frame and a lower retaining frame, and the retaining and hoisting frame is used in conjunction with the hoisting device. After one end of the hoisting rope is fixed to the upper retaining frame, it passes downward through the pulley located on one side of the lower retaining frame, and then connects upward to the support beam. With this arrangement, when the winch device on the support beam is retracting the rope, the upper retaining frame 7 will first move downward toward the lower retaining frame 8. At this time, the gradually tightening retaining and hoisting frame overcomes the retaining elastic element 4 in the cable clamping frame 1 and squeezes the two planar UHV cables 5 into a planar arrangement. The hoisting rope continues to retract, and the hoisting rope drives the entire retaining and hoisting frame to lift, thereby realizing the suspension of the UHV cable. At the same time, the upper retaining frame and the lower retaining frame approaching each other will cause the sleeve rod in the lower retaining frame to pass through the sleeve and then penetrate the upper retaining frame. Then, the end of the sleeve rod is a locking end, which can be locked into the locking hole of the support beam, thereby realizing the suspension of the UHV cable.

[0041] 6) Furthermore, in order to avoid the continuous electromagnetic radiation from the ultra-high voltage cable to underground construction personnel, both the upper and lower retainers are equipped with fine metal wire mesh with an external insulating layer, thereby creating a safe underground construction environment with a large operating space.

[0042] 7) Furthermore, the protective device of the present invention is reusable and can be used multiple times. It can be quickly removed from the UHV cable before the underground construction work is completed and the UHV cable is laid. It can be used again when the UHV cable needs to be protected again, which improves the reusability of the equipment. At the same time, the quick disassembly method also makes the protection of UHV cable very convenient and fast, which can further shorten the construction cycle and improve the efficiency of highway paving. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the cable clamp structure of the present invention;

[0044] Figure 2 This is a schematic diagram of the cable clamping frame of the present invention when clamping an ultra-high voltage cable;

[0045] Figure 3 This is a schematic diagram of the safety protection device for highways passing under ultra-high voltage power lines in the initial state of the present invention;

[0046] Figure 4 This is a schematic diagram of the safety protection device for highways passing under ultra-high voltage power lines in the present invention, under the condition of use.

[0047] Label Explanation

[0048] 1. Cable clamping frame; 2. Cable clamping semi-circular arc frame; 3. Arc frame connecting rod; 4. Retaining elastic element; 5. UHV cable; 6. Retaining lifting frame; 7. Upper retaining frame; 8. Lower retaining frame; 9. Upper buffer layer; 10. Sleeve; 11. Lower buffer layer; 12. Sleeve rod; 13. Suspension device; 14. Lifting rope; 15. Suspension seat; 16. Pulley; 17. Fixed seat; 18. Support beam; 19. Support leg; 20. Locking hole; 21. Locking end. Detailed Implementation

[0049] The present invention will be further described below with reference to embodiments, but this is not intended to limit the present invention in any way. Any modifications or substitutions made based on the teachings of the present invention shall fall within the protection scope of the present invention.

[0050] A safety protection device for highways passing under ultra-high voltage power lines, such as Figure 1-3 As shown, it includes: a cable clamping frame 1, a retaining and lifting frame 6, a suspension device 13, and a support beam 18. The cable clamping frame 1 includes a cable clamping semi-circular arc frame 2, an arc frame connecting rod 3, and a retaining elastic element 4. The two ends of the arc frame connecting rod 3 are respectively hinged to the cable clamping semi-circular arc frame 2, and the included angle between two adjacent arc frame connecting rods 3 is β. The two ends of the retaining elastic element 4 are respectively connected to the arc frame connecting rod. The cable clamping semi-circular arc frame 2 is used to accommodate ultra-high voltage cables 5. After the ultra-high voltage cables 5 are accommodated, the retaining elastic element 4 maintains the included angle β unchanged, so that the ultra-high voltage cables 5 accommodated in the cable clamping semi-circular arc frame 2 are arranged in two layers in an alternating manner, which is convenient for ultra-high voltage cables 5. During the subsequent hoisting of the high-voltage cables, it is convenient to check whether the surface of each ultra-high voltage cable 5 has been damaged. When it is necessary to protect the ultra-high voltage cables, the cable clamp 1 containing the ultra-high voltage cables 5 is placed in the holding and hoisting frame 6, and the suspension device 13 is installed and fixed between the support beam 18 and the holding and hoisting frame 6. The holding and hoisting frame 6 is clamped by the suspension device 13, and the cable clamp 1 located inside the holding and hoisting frame 6 is deformed as a result, so that the ultra-high voltage cables 5 are changed from two layers of staggered arrangement to a single layer of transverse arrangement. Finally, the suspension device 13 allows each ultra-high voltage cable 5 to be unfolded and suspended at the lower end of the support beam 18.

[0051] Preferably, such as Figure 1-2 As shown, the cable clamping semi-circular arc frame 2 is an elastic clamping frame with an opening facing downward and a radius greater than a semi-circular arc. When it is necessary to accommodate the UHV cable 5, align it with the UHV cable 5 to be accommodated, then align the opening with the UHV cable 5 and press down to accommodate the UHV cable 5.

[0052] Preferably, the retaining elastic element 4 is a compression spring or a spring, and the included angle β is greater than 0° and less than 180°. The presence of the included angle β makes all the cable clamping semicircular arc frames 2 on the cable clamping frame 1 divided into upper and lower layers. In the initial state, the gap between two adjacent lower layer cable clamping semicircular arc frames 2 is greater than the diameter of the upper layer cable clamping semicircular arc frame 2 between two adjacent lower layer cable clamping semicircular arc frames 2, so that in the initial state, the upper layer cable clamping semicircular arc frame 2 can also smoothly clamp the UHV cable 5.

[0053] Preferably, both ends of the retaining elastic member 4 can be located at the upper end of the arc frame connecting rod 3, or the retaining elastic member 4 can be located at the lower end of the arc frame connecting rod 3 and the upper end of the cable clamping semi-circular arc frame 2. This arrangement ensures that the retaining elastic member 4 will not obstruct the cable clamping semi-circular arc frame 2 from accommodating the ultra-high voltage cable 5.

[0054] Furthermore, such as Figure 3 As shown, the retaining and hoisting frame 6 includes an upper retaining frame 7 and a lower retaining frame 8 that can move closer to and further away from each other. The upper retaining frame 7 includes an upper buffer layer 9 and a sleeve 10. The sleeve 10 is disposed on both sides of the lower end of the upper buffer layer 9. The lower retaining frame 8 includes a lower buffer layer 11 and a sleeve rod 12. The sleeve rod 12 is disposed on both sides of the upper end of the lower buffer layer 11. The sleeve 10 is sleeved inside the sleeve rod 12, and the upper buffer layer 9 can slide freely relative to the lower retaining frame 8 through the sleeve 10 and the sleeve rod 12. The upper buffer layer 9 presses against the upper end of the cable clamping frame 1 located inside the retaining and hoisting frame 6.

[0055] Preferably, the height of the sleeve 10 is greater than or equal to the diameter of a single UHV cable 5. This arrangement ensures that even when the upper buffer layer 9 and the lower buffer layer 11 are squeezed together, they will not exert damaging compressive force on the UHV cable 5, thereby further improving the safety of the UHV cable.

[0056] Preferably, the elastic force of the retaining elastic element 4 is sufficient to ensure that when the retainer 7 is placed on the cable clamp 1, the cable clamp 1 can still maintain its original shape without deformation. This is to make it easier for workers to observe whether there is any damage on the surface of each ultra-high voltage cable, and to further improve the safety of the operation.

[0057] Preferably, the upper retainer 7 further includes a fixed seat 17, which is fixedly disposed at both ends of the upper buffer layer 9. The lower retainer 8 further includes a suspension seat 15 and a pulley 16. The suspension seat 15 is located at both ends of the lower buffer layer 11. The pulley 16 is rotatably disposed on the suspension seat 15. One end of the lifting rope 14 of the suspension device 13 is fixed to the fixed seat 17, then passes downward through the pulley 16, and then is fixed upward to the support beam 18.

[0058] Preferably, the suspension device 13 further includes a hoisting mechanism, such as a winch or drum, with the hoisting rope wound around the winch or drum, and the hoisting mechanism fixedly mounted on the support beam 18.

[0059] Preferably, the support beam 18 is provided with support legs 19 at both ends, and the support beam 18 is erected on the pit dug in the underground operation by means of the support legs 19.

[0060] Furthermore, such as Figure 4 As shown, the end of the sleeve rod 12 is provided with a locking end 21, and the lower end of the support beam 18 is provided with a locking hole 20. The sleeve rod 12 can penetrate the upper buffer layer 9, so that the locking end 21 is inserted into the locking hole 20. Finally, the cable clamp 1 is kept suspended in mid-air by the sleeve rod 12. With this configuration, the support component of the UHV cable in mid-air is no longer a simple suspension rope structure, but also has a rigid sleeve rod fixing structure. This configuration not only ensures the safety of the UHV cable suspension, but also ensures the stability of the UHV cable suspension. Even if the UHV cable is subjected to external force, it will not sway much, thus ensuring the safety and stability of the UHV cable suspension.

[0061] Preferably, the locking hole 20 and the locking end 21 only need to be able to maintain relative engagement and fixation. They can be locked and separated by electromagnetic lock or mechanical lock. This is not the focus of the present invention and is common knowledge in the field, so it will not be described in detail here.

[0062] Preferably, the locking hole 20 can also penetrate the entire support beam 18. The locking end 21 is provided with several horizontally arranged locking holes. After the locking end 21 is locked into the locking hole 20, the locking hole is exposed above the support beam 18. Workers can fix the beam by inserting a pin into the locking hole. When disassembly is required, the pin can be pulled out of the locking hole. The arrangement of several horizontally arranged locking holes allows for adjustment of the clamping degree of the hoisting frame 6, thereby allowing adjustment of the shape of the cable clamp frame 1.

[0063] Furthermore, since the cable clamp 1 is equipped with a retaining elastic element 4, the retaining elastic element 4 can also play a good buffering role, which can further protect the UHV cable in the hoisting frame 6 and prevent the UHV cable from being damaged by a large impact.

[0064] Preferably, in order to ensure that personnel working underground are not affected by electromagnetic radiation, both the lower buffer layer 11 and the upper buffer layer 9 include fine metal wire mesh with an outer insulating layer.

[0065] Furthermore, the present invention also provides a construction method for safety protection of highways passing under ultra-high voltage power lines, the construction method comprising the following steps:

[0066] A. Construction environment survey and construction preparation;

[0067] Investigate and survey the underground laying depth, location, diameter, material, laying direction and surrounding environment of UHV cable 5, remove the soil and rocks above and to the side of the power channel formed by the UHV cable, and erect a support beam 18 that spans the UHV power channel.

[0068] B. Preparations before hanging ultra-high voltage cables:

[0069] 1. Insert the UHV cables that need to be suspended into the cable clamping semi-circular arc frame 2 of the cable clamping frame 1, and carefully check whether there is any damage or breakage on the surface of the UHV cables.

[0070] II. Insert the lower buffer layer 11 under the cable clamp 1 that holds the ultra-high voltage cable, and install the sleeve rod 12 on both sides of the lower buffer layer 11.

[0071] III. Install the upper buffer layer 9 with sleeve 10 onto the lower buffer layer 11, so that the sleeve 10 is fitted onto the outside of the sleeve rod 12.

[0072] IV. After passing one end of the lifting rope 14 of the suspension device 13 downwards around the pulleys 16 on both sides of the lower buffer layer 11, it is threaded upwards and then fixed to the fixing seat 17 on the side of the upper buffer layer 9 to complete the preparation before the suspension of the UHV cable.

[0073] C. Suspension of ultra-high voltage cables:

[0074] I. Start the hoisting mechanism installed on the support beam 18, so that the hoisting rope 14 retracts, causing the upper retainer 7 to move downward and approach the lower retainer 8. The downward moving upper retainer 7 squeezes the cable clamping frame 1 inside the retaining hoisting frame 6, causing the retaining elastic element 4 to deform, and finally causing the cable clamping semi-circular arc frames 2 to change from two layers of staggered arrangement to a single layer of planar arrangement.

[0075] II. Continue to retract the hoisting rope 14, which will drive the entire holding hoisting frame 6 to rise until the holding hoisting frame 6 is held in the air, thus completing the suspension of the UHV cable.

[0076] Preferably, the weight of the upper retainer 7 can also be set to be larger, so that after the upper retainer 7 is placed on the lower retainer 8, it slides downward due to gravity, overcoming the elastic force of the retaining elastic member 4, and the cable clamping semi-circular arc frame 2 is changed from a two-layer staggered arrangement to a single-layer planar arrangement.

[0077] Preferably, step C further includes step III, whereby the winch mechanism continues to wind up the rope until the locking end of the sleeve rod 12 is inserted into the locking hole 20 of the support beam 18, thus completing the locking.

[0078] Preferably, the sleeve rod 12 can also be a telescopic rod structure driven by a hydraulic cylinder. This configuration allows the sleeve rod 12 to extend and its locking end to be inserted into the locking hole of the support beam 18 even if the ultra-high voltage cable cannot be raised to a position close to the supporting beam 18. It should be noted that this type of telescopic rod structure is a common telescopic sleeve rod structure in the art and is common knowledge in the field. Since it is not the focus of this invention, it will not be described in detail here.

[0079] To enable those skilled in the art to understand this application in detail, the working process of the safety protection device for highway underpasses of ultra-high voltage power lines of this application is described as follows: The safety protection device includes a cable clamp frame 1, a retaining and hoisting frame 6, a suspension device, and a support beam 18. When safety protection of ultra-high voltage cables is required, the ultra-high voltage cables are first held on the cable clamp frame 1 by the cable clamping semi-circular arc frame 2 on the cable clamp frame 1; then the retaining and hoisting frame 6 is assembled so that the cable clamp frame 1 is located within the retaining and hoisting frame 6; finally, the suspension device is used to protect the cable underpasses of ultra-high voltage power lines. The lifting device 13 is set between the support beam 18 and the holding and lifting frame 6. Finally, the winch mechanism fixed on the support beam 18 is activated to lift the lifting rope. When the lifting begins, the holding and lifting frame 6 is first squeezed to make the UHV cable a horizontal arrangement in a plane. Then the entire holding and lifting frame 6 is lifted. Finally, the sleeve rod 12 extends out of the upper holding frame 7 and cooperates with the locking hole 20 in the support beam 18. Finally, the locking end 21 at the end of the sleeve rod 12 is fixedly locked in the locking hole 20, thus completing the safety protection of the UHV cable. Then, the next step of construction can be carried out on the foundation pit. After the construction in the foundation pit is completed, firstly, release the locking end 21 and locking hole 20 to restore the sleeve rod 12 (this restoration step is required if the sleeve rod 12 has extended). Then, the winch mechanism drives the hoisting rope to rotate in the reverse direction. After the lower retaining frame 8 of the hoisting frame 6 is in contact with the ground, continue to release the hoisting rope. At this time, the retaining elastic element 4 in the cable clamp frame 1 is restored, causing the upper retaining frame 7 to slide upward until the upper retaining frame 7 stops rising. The hoisting mechanism is stopped; then the lifting rope 14 is removed from the holding and lifting frame 6, and the upper holding frame 7 is removed from the lower holding frame 8. The sleeve rods 12 on both sides of the lower buffer layer 11 are removed, and then the lower buffer layer 11 is pulled out from the lower part of the cable clamp frame 1. Finally, one end of the UHV cable is fixed, and the cable clamp frame 1 is pulled upward. At this time, the cable clamp semi-circular arc frame 2 deforms, and finally the UHV cable 5 is removed from the cable clamp frame 1. Then the UHV cable is restored to its original state. This realizes the detachable and reusable use of the safety protection device, which saves costs and makes underground construction with UHV cables safer. At the same time, while suspending the UHV cable, it is also possible to clearly check whether the surface of each UHV cable is damaged, further improving construction safety.

[0080] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A safety protection device for highway underpassing ultra-high voltage power line, comprising: Cable clamping frame (1), holding lifting frame (6), suspension device (13) and support beam (18), characterized in that: the cable clamping frame (1) comprises cable clamping half circular arc frame (2), arc frame connecting rod (3) and holding elastic element (4), both ends of the arc frame connecting rod (3) are hinged with the cable clamping half circular arc frame (2) respectively, the included angle of two adjacent arc frame connecting rods (3) is β, the holding elastic element (4) is connected with the arc frame connecting rod at both ends, the cable clamping half circular arc frame (2) is used for accommodating extra-high voltage cable (5), the holding elastic element (4) keeps the included angle β unchanged after the extra-high voltage cable (5) is accommodated in the cable clamping half circular arc frame (2), finally makes the extra-high voltage cable (5) accommodated in the cable clamping half circular arc frame (2) arranged in two layers, at the same time, it is convenient to check whether the surface of each extra-high voltage cable (5) is damaged, when it is necessary to protect the extra-high voltage cable, the cable clamping frame (1) containing the extra-high voltage cable (5) is placed in the holding lifting frame (6), and the suspension device (13) is installed and fixed between the support beam (18) and the holding lifting frame (6), the holding lifting frame (6) is clamped by the suspension device (13), the cable clamping frame (1) in the holding lifting frame (6) is deformed, so that the extra-high voltage cable (5) changes from two-layer staggered arrangement to single-layer horizontal arrangement, finally, the suspension device (13) makes each extra-high voltage cable (5) expand and hang under the lower end of the support beam (18).

2. The safety protection device for highway underpassing ultra-high voltage power line according to claim 1, characterized in that: The cable clamping half circular arc frame (2) is an elastic clamping frame with an opening downward and greater than half circular arc, when it is necessary to accommodate the extra-high voltage cable (5), align the extra-high voltage cable (5) to be accommodated, then press downward with the opening aligning the extra-high voltage cable (5), the extra-high voltage cable (5) can be accommodated in the cable clamping half circular arc frame (2).

3. The safety protection device for highway underpassing ultra-high voltage power line according to claim 1, characterized in that: The holding elastic element (4) is a spring, the included angle β is greater than 0° and less than 180°, the existence of the included angle β makes all the cable clamping half circular arc frames (2) on the cable clamping frame (1) divided into two layers, in the initial state, the gap between the two adjacent cable clamping half circular arc frames (2) in the lower layer is greater than the diameter of the upper cable clamping half circular arc frame (2) between the two adjacent cable clamping half circular arc frames (2) in the lower layer, so that in the initial state, the upper cable clamping half circular arc frame (2) can also tightly clamp the extra-high voltage cable (5).

4. The safety protection device for highway underpassing ultra-high voltage power line according to claim 1, characterized in that: The holding lifting frame (6) comprises upper and lower holding frames (7, 8) which can move towards or away from each other, the upper holding frame (7) comprises an upper buffer layer (9) and sleeves (10) arranged on both sides of the lower end of the upper buffer layer (9), the lower holding frame (8) comprises a lower buffer layer (11) and sleeves (12) arranged on both sides of the upper end of the lower buffer layer (11), the sleeves (10) are sleeved outside the sleeves (12), and the upper buffer layer (9) can freely slide relative to the lower holding frame (8) through the sleeves (10) and the sleeves (12), and the upper buffer layer (9) is pressed against the upper end of the cable clamping frame (1) located inside the holding lifting frame (6).

5. The safety protection device for highway underpassing ultra-high voltage power line according to claim 4, characterized in that: The upper holding frame (7) further comprises fixing seats (17) fixedly arranged at both ends of the upper buffer layer (9), the lower holding frame (8) further comprises hanging seats (15) located at both ends of the lower buffer layer (11) and pulleys (16) rotatably arranged on the hanging seats (15), and one end of the lifting rope (14) of the suspension device (13) is fixed to the fixing seat (17), then passes through the pulley (16) downward, and is then fixed to the support beam (18) upward.

6. The safety protection device for highway underpassing ultra-high voltage power line according to claim 5, characterized in that: The suspension device (13) further comprises a winding mechanism, the winding mechanism is a winding machine or a winding drum, the lifting rope is wound on the winding machine or the winding drum, and the winding mechanism is fixedly arranged on the support beam (18).

7. The safety protection device for highway underpassing ultra-high voltage power line according to claim 4, characterized in that: The end of the sleeve (12) is provided with a locking end (21), the lower end of the support beam (18) is provided with a locking hole (20), the sleeve (12) can penetrate the upper buffer layer (9), so that the locking end (21) is inserted into the locking hole (20), and finally the cable clamping frame (1) is kept suspended in the air through the sleeve (12).

8. The safety protection device for highway underpassing ultra-high voltage power line according to claim 3, characterized in that: The spring is a compression spring.

9. A construction method of the highway underpass UHV power line safety protection device according to any one of claims 4-7, characterized in that: The construction method comprises the following steps: A. Construction environment survey and construction preparation; investigate and survey the underground laying depth, position, diameter, material, laying direction and surrounding environment of the ultra-high voltage cable (5), remove the soil and rock above and on the side of the power channel formed by the ultra-high voltage cable, and erect the support beam (18) which crosses the ultra-high voltage power channel; B. Preparation before suspending the ultra-high voltage cable: I. respectively clamp the ultra-high voltage cables to be suspended into the cable clamping semi-circular arches (2) of the cable clamping frames (1), and carefully check whether the surface of the ultra-high voltage cable is damaged or damaged; II. insert the lower buffer layer (11) into the cable clamping frame (1) clamped with the ultra-high voltage cable, and install the sleeves (12) on both sides of the lower buffer layer (11); III. install the upper buffer layer (9) with the sleeves (10) on the lower buffer layer (11), so that the sleeves (10) are sleeved outside the sleeves (12); IV. one end of the lifting rope (14) of the suspension device (13) is wound downward through the pulleys (16) on both sides of the lower buffer layer (11), then is upwardly threaded, and is then fixed to the fixing seat (17) on the side of the upper buffer layer (9), and the preparation before suspending the ultra-high voltage cable is completed. C. UHV cable suspension: I. Start the winch mechanism installed on the support beam (18) to make the hoisting rope (14) retract, drive the upper holder (7) to move downward to approach the lower holder (8), the downward moving upper holder (7) extrudes the cable clamping holder (1) inside the holding hoisting frame (6), the holding elastic member (4) is deformed, and finally makes each cable clamping semi-circular arc holder (2) change from two-layer staggered arrangement to single-layer planar arrangement; II. Continue to make the hoisting rope (14) retract, at this time drive the entire holding hoisting frame (6) to rise until the holding hoisting frame (6) is kept in the air, and the UHV cable suspension is completed.

10. The construction method of the highway underpass ultra-high voltage power line safety protection device according to claim 9, characterized in that: The step C further comprises step III, the winch mechanism continues the rope retraction action until the locking end head at the end of the sleeve rod (12) is inserted into the locking hole (20) of the support beam (18), and the locking is completed.

11. The construction method of the highway underpass ultra-high voltage power line safety protection device according to claim 10, characterized in that: The sleeve rod (12) is a telescopic rod structure driven by a hydraulic cylinder.

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