Cable trench structure and superconducting cable laying method

Abstract

The invention relates to a cable trench structure and a superconducting cable laying method, and relates to the technical field of cable laying. The cable trench structure comprises a trench body, a first cover plate and a second cover plate, the interior of the trench body is provided with an accommodating groove, the accommodating groove is arranged below a road surface along a first direction, the opening of the accommodating groove faces the road surface, and the superconducting cable is laid in the accommodating groove; the first cover plate covers the opening of the accommodating groove; the second cover plate is laid on the top side of the first cover plate in the first direction and is flush with the road surface. The cable protection device can perform double protection on the cable to prevent the cable from being damaged by a foreign object.

Description

Technical Field

[0001] This application relates to the technical field of cable laying, and particularly to a cable trench structure and a superconducting cable laying method. Background Art

[0002] Superconducting cables have many advantages such as large transmission capacity, small corridor footprint, and environmental friendliness, providing an efficient, compact, reliable, and green power transmission method for the power grid.

[0003] In related technologies, superconducting cables are laid in conventional cable trenches, and the superconducting cables are directly placed on brackets. However, superconducting cables are extremely expensive and extremely difficult to repair once damaged. And once the cable trench cover plate is damaged, the broken pieces of the cover plate or other sundries may damage the cable, resulting in damage to the superconducting cable, and the cost of repairing the superconducting cable and power outage losses is high. Summary of the Invention

[0004] Based on this, it is necessary to provide a cable trench structure and a superconducting cable laying method for the problem of insufficient protection of superconducting cables by cable trenches.

[0005] To achieve the above object, the technical solutions adopted in this application are as follows:

[0006] In the first aspect, an embodiment of this application provides a cable trench structure for laying superconducting cables, and the cable trench structure includes:

[0007] A trough body with a receiving trough inside. The receiving trough is arranged below the road surface along a first direction, and the opening of the receiving trough faces the road surface. The superconducting cable is laid in the receiving trough;

[0008] A first cover plate covering the opening of the receiving trough;

[0009] A second cover plate laid on the top side of the first cover plate in the first direction and flush with the road surface.

[0010] In one embodiment of the first aspect, the cable trench structure further includes brickwork, and the brickwork is distributed on opposite sides of the top of the trough body. The second cover plate is laid on the brickwork so that there is a gap between the second cover plate and the first cover plate.

[0011] In one embodiment of the first aspect, the cable trench structure further includes a plurality of support frames, and the support frames are sequentially arranged at intervals along a second direction in the receiving trough. The superconducting cables are sequentially placed on the support frames along the second direction;

[0012] Wherein, the second direction is perpendicular to the first direction.

[0013] In one embodiment of the first aspect, the support frame includes a frame body and two first pulleys. One end of the frame body is fixed to the bottom of the trough body. The first pulleys are rotatably installed on the frame body and are arranged oppositely along the first direction. The superconducting cable passes through between the two first pulleys.

[0014] In one embodiment of the first aspect, the distance between two adjacent support frames is 4m - 6m.

[0015] In one embodiment of the first aspect, the support frame further includes two second pulleys. The second pulleys are rotatably installed on the frame body and are arranged oppositely along the third direction. The two second pulleys and the two first pulleys define a laying channel, and the superconducting cable passes through the laying channel.

[0016] Wherein, any two of the first direction, the second direction and the third direction are perpendicular to each other.

[0017] In one embodiment of the first aspect, the outer diameters of the first pulley and the second pulley gradually decrease from both ends to the middle.

[0018] In one embodiment of the first aspect, the support includes two first channel steels and two second channel steels. The two first channel steels are arranged oppositely and fixed to the bottom of the trough body. Each second channel steel is respectively installed on a corresponding first channel steel. Both ends of the first pulley are respectively rotatably connected to the two first channel steels. Each second channel steel is respectively rotatably provided with a second pulley.

[0019] In one embodiment of the first aspect, the opening sides of the two first channel steels are arranged back to back, and both ends of the first pulley are respectively rotatably connected to the middle groove surfaces of the two first channel steels; the opening sides of the two second channel steels are arranged oppositely, and both ends of each second pulley are respectively rotatably connected to the two side groove surfaces arranged oppositely of the corresponding second channel steel.

[0020] In a second aspect, an embodiment of the present application further provides a method for laying a superconducting cable, which is applied to the cable trench structure described in any of the above embodiments. The method for laying a superconducting cable includes:

[0021] Excavate a trench according to a preset marking, and pour a cushion after leveling the foundation.

[0022] Lay the trough body, and fill slag material on the periphery of the trough body. Stacking is provided on both sides of the top of the trough body.

[0023] Install a support frame at the bottom of the trough body, and control the distance between two adjacent support frames.

[0024] Thread the superconducting cable through the laying channels of the support frames in sequence, tow the superconducting cable to the set end point, and control the sag of the superconducting cable between two adjacent support frames;

[0025] Cover the first cover plate on the top of the trough body, cover the second cover plate on the brickwork, and make the second cover plate flush with the road surface.

[0026] Compared with the related art, the beneficial effects of this application are as follows: This application provides a cable trench structure and a superconducting cable laying method, which can improve the laying protection of superconducting cables. The cable trench structure includes a trough body, a first cover plate and a second cover plate. After the superconducting cable is laid in the receiving groove of the trough body, the first cover plate can be used to cover the trough body to provide the first layer of protection for the superconducting cable. Then, a second cover plate is arranged above the first cover plate for double protection. In this way, even if the second cover plate is damaged, the first cover plate can still provide protection, and the cable will not be damaged by being hit by external objects. Moreover, the second cover plate is flush with the road surface, maintaining the overall aesthetics. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is a schematic structural diagram of the cable trench structure in some embodiments of this application;

[0029] Figure 2 It is a schematic laying structure diagram of the superconducting cable in some embodiments of this application;

[0030] Figure 3 It is a front view structural diagram of the support frame in some embodiments of this application;

[0031] Figure 4 It is a side view structural diagram of the support frame in some embodiments of this application;

[0032] Figure 5 It is a top view structural diagram of the support frame in some embodiments of this application;

[0033] Figure 6 It is a schematic flow diagram of the superconducting cable laying method in some embodiments of this application.

[0034] Explanation of the Reference Numerals:

[0035] 100, Cable trench structure; 110, Trough body; 111, Accommodating groove; 120, First cover plate; 130, Second cover plate; 140, Brickwork; 150, Support frame; 151, Layout passage; 152, Frame body; 1521, First channel steel; 1522, Second channel steel; 153, First pulley; 154, Second pulley; 155, Base; 160, Cushion layer; 170, Filling layer;

[0036] 200, Road surface; 300, Superconducting cable;

[0037] z, First direction; y, Second direction; x, Third direction. Detailed implementation manners

[0038] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0039] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0040] In addition, if there are terms such as "and / or", "and / or" is only an associative relationship describing associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after. If there are terms such as "first" and "second", these terms are only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, if there are terms such as "multiple", the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0041] In this application, unless otherwise clearly defined and limited, if terms such as "installed", "connected", "linked", "fixed", etc. appear, these terms shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] In this application, unless otherwise clearly defined and limited, if there is a description such as a first feature being "on" or "under" a second feature, its meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0043] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If any, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0044] In the related art, superconducting cables use conventional cable trenches, and the superconducting cables are directly placed on brackets. However, the following problems exist: First, superconducting cables are vulnerable to external damage when laid in conventional cable trenches. Superconducting cables are extremely expensive and extremely difficult to repair once damaged. At the same time, once the cable trench cover plate is damaged, the broken pieces of the cover plate or other sundries may hit the cable, causing damage to the superconducting cable, and the cost of repairing the superconducting cable and power outage losses is high. Second, it is inconvenient to install superconducting cables in conventional cable trenches. Superconducting cables cannot be directly dragged longitudinally on the brackets of conventional cable trenches. After laying at the bottom of the cable trench or on the ground, they need to be moved and placed on the cable brackets, which is inconvenient for construction. Third, conventional cable trenches do not consider the influence of thermal expansion and contraction of superconducting cables. The installation of superconducting cables is carried out at room temperature. After installation, liquid nitrogen is injected into the adiabatic tube of the superconducting cable to cool its core to the operating temperature, that is, 77K. The temperature difference inside the superconducting cable before and after injecting liquid nitrogen is as high as about 220°C. Under the action of the strong internal contraction force, the superconducting cable will contract longitudinally. When the superconducting cable is out of service, the liquid nitrogen is recovered, and the superconducting cable will gradually return to room temperature. During this process, the superconducting cable will elongate longitudinally. Thus, during the contraction and elongation process of the superconducting cable, the anti-slip corrugations on the surface of the bracket may damage the outer sheath of the superconducting cable.

[0045] Referring to Figure 1 As shown, to improve the above problems, an embodiment of the present application provides a cable trench structure 100, which can be used for laying superconducting cables 300 and provides multiple protections for the superconducting cables 300 to reduce the risk of damage.

[0046] Specifically, the cable trench structure 100 includes a trough body 110, a first cover plate 120, and a second cover plate 130. Among them, the trough body 110 is provided with a receiving groove 111 and is arranged below the road surface 200 along the first direction z, and the superconducting cable 300 is laid in the receiving groove 111. The first cover plate 120 is covered on the top surface of the trough body 110 in the first direction z. The second cover plate 130 is laid on the top side of the first cover plate 120 in the first direction z.

[0047] It should be noted that in the embodiment of the present application, the first direction z is the height direction of the trough body 110, the second direction y is the length direction of the trough body 110, the third direction x is the width direction of the trough body 110, and any two of the first direction z, the second direction y, and the third direction x are perpendicular to each other.

[0048] Exemplarily, after the trough body 110 is placed in the excavated trench, there is still a certain distance between its top and the ground. When laying the superconducting cable 300, first place the superconducting cable 300 in the receiving groove 111 of the trough body 110. Then, seal the first cover plate 120 on the trough body 110 to form the first layer of protection for the cable, and further cover the second cover plate 130 to form a double-layer protection for the cable. In this way, when the second cover plate 130 exposed to the road surface 200 is crushed and damaged, its fragments or external sundries will not directly hit the cable, thereby reducing the risk of cable damage and lowering the maintenance cost. In addition, since there is a distance between the first cover plate 120 and the ground, after the second cover plate 130 is laid on the ground, the second cover plate 130 will not directly contact the first cover plate 120, so that the external crushing force received by the second cover plate 130 will not directly act on the first cover plate 120, reducing the risk of damage to the first cover plate 120 and further improving the protection performance of the superconducting cable 300.

[0049] Further, the second cover plate 130 is laid flush with the road surface 200. In this way, even in the area where the cable trench is excavated, the road surface 200 can be kept flat, reducing the risk for pedestrians and improving the aesthetics at the same time. Still further, the upper surface of the second cover plate 130 on the ground can adopt decorative materials consistent with the municipal road surface 200, such as sidewalk paving bricks, etc., further playing a role in beautification.

[0050] In some embodiments, the cable trench structure 100 further includes brickwork 140, and the brickwork 140 is distributed on two opposite sides of the top of the trough body 110. The second cover plate 130 is laid on the brickwork 140 so that there is a gap between the second cover plate 130 and the first cover plate 120.

[0051] Specifically, the brickwork 140 is built along the top edge side of the trough body 110 to support the second cover plate 130 located above and form a gap between the first cover plate 120 and the second cover plate 130. Further, the top of the brickwork 140 is flush with the road surface 200 and is provided with a downwardly concave step structure, so that the second cover plate 130 is built on the step surface of the brickwork 140 to make the second cover plate 130 flush with the road surface 200. Similarly, the top of the trough body 110 is also provided with a downwardly concave step structure, so that the first cover plate 120 is built on the step surface of the trough body 110 to make the first cover plate 120 flush with the trough body 110.

[0052] In some embodiments, the cable trench structure 100 further includes a filler layer, and the filler layer can be formed by backfilling the outer side edges of the trough body 110 and the brickwork 140 with crushed stone and slag to support the trough body 110 and the brickwork 140 and improve the strength of the cable trench structure 100.

[0053] In some embodiments, the cable trench structure 100 further includes a cushion layer 160. After the trench is excavated, the bottom surface can be first leveled, and then concrete is poured to form a flat concrete cushion layer 160 on the trench floor. In this way, it is convenient for the subsequent trough body 110 to be placed on the cushion layer 160, keep stable, and can isolate the underground water seepage.

[0054] Continue to refer to Figure 2 As shown, in some embodiments, the cable trench structure 100 further includes a plurality of support frames 150. Each support frame 150 is sequentially arranged at intervals along the second direction y in the receiving groove 111 of the trough body 110, and the superconducting cable 300 is sequentially laid on each support frame 150 along the second direction y.

[0055] Specifically, through the support restriction of the support frame 150, the superconducting cable 300 is not in direct contact with the ground, reducing the direct contact wear with the ground. At the same time, to a certain extent, it can also avoid the influence of underground water seepage on the superconducting cable 300.

[0056] Furthermore, the distance L between two adjacent support frames 150 is 4m - 6m.

[0057] Exemplarily, the distance L between two adjacent support frames 150 can be 4m, 4.1m, 4.2m, 4.3m, 4.4m, 4.5m, 4.6m, 4.7m, 4.8m, 4.9m, 5m, etc., and can be reasonably selected according to actual needs. Through the above distance setting, it can be avoided that the distance is too large, and the superconducting cable 300 sags excessively and is in direct contact with the ground of the trough body 110. In this way, while ensuring the support requirement of the support frame 150 for the superconducting cable 300, the laying quantity of the support frame 150 is reduced, and the cost is lowered.

[0058] Continue to refer to Figure 3 As shown, in some embodiments, the support frame 150 includes a frame body 152 and two first pulleys 153. One end of the frame body 152 is fixed to the bottom of the trough body 110. The two first pulleys 153 are rotatably installed on the frame body 152 and are arranged oppositely along the first direction z, and the superconducting cable 300 passes through between the two first pulleys 153.

[0059] Specifically, through the two first pulleys 153 arranged up and down, during the laying process of the superconducting cable 300, the upper and lower sides of the superconducting cable 300 are restricted by the first pulleys 153. In this way, through the rotation of the first pulleys 153, the superconducting cable 300 can be longitudinally traction-moved without first being laid in the trough body 110 or on the ground and then being moved to the support frame 150, saving manpower and improving the construction convenience.

[0060] Further, the support frame 150 further includes two second pulleys 154. The two second pulleys 154 are rotatably mounted on the frame body 152 and are oppositely arranged along the third direction x. The two second pulleys 154 and the two first pulleys 153 define a laying channel 151, and the superconducting cable 300 is threaded through the laying channel 151.

[0061] Specifically, the left and right sides of the superconducting cable 300 are restricted by the two second pulleys 154, further restricting the movement space of the superconducting cable 300. During the laying process of the superconducting cable 300, the end of the superconducting cable 300 passes through the laying channel 151 defined by the second pulley 154 and the first pulley 153, and then the superconducting cable 300 is longitudinally pulled and moved to sequentially pass through each support frame 150 in the pulling direction, improving the laying efficiency. At the same time, during the movement of the superconducting cable 300, both the second pulley 154 and the first pulley 153 rotate following the superconducting cable 300 to avoid hard contact friction during the movement of the superconducting cable 300 and reduce the skin abrasion of the superconducting cable 300.

[0062] Furthermore, the outer diameters of the first pulley 153 and the second pulley 154 gradually decrease from both ends to the middle. In this way, a smooth arc surface is formed on the surfaces of the first pulley 153 and the second pulley 154, so as to perfectly fit the circular surface of the superconducting cable 300 when contacting the superconducting cable 300, reducing the friction during the movement of the superconducting cable 300. At the same time, the superconducting cable 300 in the laying state can be restricted to avoid abrasion of the superconducting cable 300 during its own telescopic movement. Even if the superconducting cable 300 needs to turn, the support frame 150 can be used to achieve it without adding other pulley groups.

[0063] Refer to again Figure 2 As shown, after the superconducting cable 300 is pulled into place, relying on the self - gravity of the superconducting cable 300 or the action of an external force, the superconducting cable 300 is laid into a hanging snake - shape, forming a state - one structure located below. The initial snake - shape arc amplitude of each snake - shape arc is B, and it meets the cold - shrinkage requirements of the superconducting cable 300.

[0064] After liquid nitrogen is injected into the heat - insulating tube of the superconducting cable 300, the temperature of its core will drop from room temperature to the operating temperature, that is, 77K. Under the action of the strong contraction force inside it, the superconducting cable 300 will shrink significantly. The snake - shape arc changes from state one to state two, and the maximum vertical displacement of the superconducting cable 300 is n.

[0065] When the superconducting cable 300 is out of service, the liquid nitrogen is recovered, and the superconducting cable 300 will gradually return to room temperature. During this process, the superconducting cable 300 will gradually evolve from state two to state one, and the maximum vertical displacement of the superconducting cable 300 is less than or equal to n.

[0066] In the above two processes, the superconducting cable 300 droops in a serpentine arc, eliminating the influence of the thermal expansion and contraction of the superconducting cable 300 itself during the cooling and warming processes. Since the serpentine arcs on both sides of each special support are completely symmetrical, there is no relative slip between the superconducting cable 300 and the special support pulley. Even if the adjacent serpentine arcs are not completely symmetrical, the superconducting cable 300 can move freely longitudinally along the special support to achieve balance, eliminating the internal stress in the superconducting cable 300. During the warming process, due to the limitation of the second pulley 154, the superconducting cable 300 will not fall off the special support.

[0067] Continue to refer to Figure 4 As shown, in some embodiments, the support includes two first channel steels 1521 and two second channel steels 1522. The two first channel steels 1521 are arranged oppositely and fixed to the bottom of the trough body 110, and each second channel steel 1522 is respectively installed on a corresponding first channel steel 1521. Both ends of the first pulley 153 are rotatably connected to the two first channel steels 1521, and each second channel steel 1522 is respectively provided with a second pulley 154 rotatably.

[0068] Specifically, the support further includes a base 155. The first channel steel 1521 is vertically fixed to the base 155 by welding, and the second channel steel 1522 is welded in parallel to a corresponding first channel steel 1521. Then, the base 155 is fixed to the bottom of the trough body 110 by bolts to satisfy the overall fixation of the support frame 150 and ensure the stable support of the superconducting cable 300.

[0069] Continue to refer to Figure 5 As shown, further, the open sides of the two first channel steels 1521 are arranged back to back, and both ends of the first pulley 153 are rotatably connected to the middle groove surfaces of the two first channel steels 1521. The open sides of the two second channel steels are arranged opposite to each other, and both ends of each second pulley 154 are respectively rotatably connected to the two side groove surfaces opposite to each other of a corresponding second channel steel.

[0070] It can be understood that the channel steel includes a middle groove surface in the middle and two side groove surfaces on both sides. By arranging the open sides of the two first channel steels 1521 back to back, it is convenient to install the first pulley 153 and prevent the side groove surfaces of the first channel steels 1521 from protruding from the laying channel 151. Similarly, by arranging the open sides of the two second channel steels 1522 opposite to each other and accommodating the second pulley 154 in the trough body 110 of the second channel steel 1522, it can satisfy that the superconducting cable 300 directly contacts the first pulley 153 and the second pulley 154 during the laying process, without directly contacting the groove surfaces of the first channel steel 1521 or the second channel steel 1522, reducing contact wear and avoiding damage to the skin of the superconducting cable 300.

[0071] Continue to refer to Figure 6As shown in the figure, an embodiment of the present application further provides a method for laying a superconducting cable 300, which is applied to the cable trench structure 100 in any of the above embodiments.

[0072] Specifically, the method for laying the superconducting cable 300 includes:

[0073] S10. Excavate a trench according to a preset marking. After leveling the foundation, pour a cushion layer 160.

[0074] Exemplarily, before excavating the trench of the cable trench, it is necessary to first perform fixed-point marking to effectively control the straightness of the cable trench. After the trench excavation is completed, compact the bottom soil to prevent the cable trench from sinking. At the same time, set control piles for the cushion layer 160 to effectively control the elevation of the cushion layer 160 and keep the height of the cushion layer 160 consistent. Then, pour concrete and form a flat and hardened cushion layer 160 after leveling.

[0075] S20. Lay the trough body 110, and fill slag materials on the periphery of the trough body 110. Stacking is provided on both sides of the top of the trough body 110.

[0076] Exemplarily, since the laying length of the cable trench is relatively long, the trough body 110 can be prefabricated into multiple segments, and then placed in the trench in sequence and spliced. In this way, after the cushion layer 160 is hardened, the segments of the trough body 110 are hoisted by a special lifting tool to ensure safety and stability and improve the construction efficiency. Sealant bonding is performed between two adjacent segments to ensure straightness and beauty after installation and ensure the waterproof and sealing performance.

[0077] After the installation of the trough body 110 is completed, fill crushed stone and slag between the trough body 110 and the trench to form a filling layer 170 to support and stabilize the trough body 110. Then, build a brickwork 140 above the trough body 110 to make the top of the brickwork 140 flush with the road surface 200, and reserve a step surface for installing the second cover plate 130.

[0078] S30. Install a support frame 150 at the bottom of the trough body 110 and control the spacing between two adjacent support frames 150.

[0079] Exemplarily, drill holes on the bottom surface of the trough body 110 to fix the base 155 of the support frame 150 to the trough body 110 through bolts. And when installing the support frame 150, control the spacing between two adjacent support frames 150 to be between 4 m and 6 m.

[0080] S40. Pass the superconducting cable 300 through the laying channels 151 of the support frames 150 in sequence, tow the superconducting cable 300 to the set end point, and control the droop of the superconducting cable 300 between two adjacent support frames 150.

[0081] Exemplarily, after the superconducting cable 300 passes through the first support frame 150, the end of the superconducting cable 300 is pulled forward by a traction device or manually. During the forward movement, the superconducting cable 300 is sequentially controlled to pass through the laying channels 151 of each support frame 150. The first pulley 153 and the second pulley 154 rotate following the superconducting cable 300 to implement the laying of the superconducting cable 300. Meanwhile, the sag of the superconducting cable 300 between two adjacent support frames 150 is controlled to prevent the superconducting cable 300 from directly contacting the bottom of the groove at normal temperature, and an amount of movement for contraction and upward pull is reserved.

[0082] S50, cover the first cover plate 120 on the top of the groove body 110, cover the second cover plate 130 on the brickwork 140, and make the second cover plate 130 flush with the road surface 200.

[0083] Exemplarily, first use a special moving tool to hoist the first cover plate 120, and sequentially lay each first cover plate 120 on the groove body 110. After the laying of the first cover plate 120 is completed, lay the second cover plate 130 on the brickwork 140 in sequence to achieve double-layer protection for the superconducting cable 300.

[0084] In summary, for the cable trench structure 100 and the superconducting cable 300 laying method provided by the present application, a double-layer cover plate structure is adopted. The second cover plate 130 mainly bears loads such as vehicles on the road surface 200, and the first cover plate 120 mainly plays a secondary protection role. It can still protect the superconducting cable 300 from external force damage in the case of upper construction or damage to the second cover plate 130, improving the reliability of the superconducting cable 300 line. In addition, during the laying construction of the superconducting cable 300, the superconducting cable 300 can directly perform a dragging operation on the support frame 150. The setting of the first pulley 153 and the second pulley 154 can greatly reduce the frictional resistance of the superconducting cable 300 and can meet the traction requirements in different directions. And after the superconducting cable 300 is pulled into place, it is directly placed on the support frame 150 without secondary relocation of the superconducting cable 300, greatly improving the installation convenience of the superconducting cable 300. Finally, the superconducting cable 300 is laid in a hanging serpentine shape, and the influence of thermal expansion and contraction of the superconducting cable 300 is eliminated by using the change of the radian, ensuring the safe and stable operation of the superconducting cable 300.

[0085] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0086] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patented application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A cable trench structure, characterized in that, For the laying of superconducting cables, the cable trench structure includes: A trough body with a receiving trough inside. The receiving trough is arranged below the road surface along a first direction, and the opening of the receiving trough faces the road surface. The superconducting cable is laid in the receiving trough; A first cover plate covering the opening of the receiving trough; A second cover plate laid on the top side of the first cover plate in the first direction and flush with the road surface.

2. The cable trench structure according to claim 1, characterized in that The cable trench structure further includes bricklaying, which is distributed on opposite sides of the top of the trough body. The second cover plate is laid on the bricklaying so that there is a gap between the second cover plate and the first cover plate.

3. The cable trench structure according to claim 1, wherein, The cable trench structure further includes a plurality of support frames, and each of the support frames is arranged at intervals along a second direction in the receiving trough. The superconducting cable is successively laid on each of the support frames along the second direction; Wherein, the second direction is perpendicular to the first direction.

4. The cable trench structure according to claim 3, wherein The support frame includes a frame body and two first pulleys. One end of the frame body is fixed to the bottom of the trough body. The first pulleys are rotatably installed on the frame body and are arranged opposite to each other along the first direction. The superconducting cable passes through between the two first pulleys.

5. The cable trench structure according to claim 4, wherein, The distance between two adjacent support frames is 4m - 6m.

6. The cable trench structure according to claim 4, characterized in that, The support frame further includes two second pulleys. The two second pulleys are rotatably installed on the frame body and are arranged opposite to each other along a third direction. The two second pulleys and the two first pulleys define a laying channel, and the superconducting cable passes through the laying channel; Wherein, any two of the first direction, the second direction and the third direction are perpendicular to each other.

7. The cable trench structure according to claim 6, characterized in that, The outer diameters of the first pulley and the second pulley both gradually decrease from both ends to the middle.

8. The cable trench structure according to claim 6, wherein, The support includes two first channel steels and two second channel steels. The two first channel steels are arranged opposite to each other and fixed to the bottom of the trough body. Each of the second channel steels is installed on a corresponding first channel steel. Both ends of the first pulley are rotatably connected to the two first channel steels respectively, and each of the second channel steels is rotatably provided with a second pulley.

9. The cable trench structure according to claim 8, characterized in that, The opening sides of the two first channel steels face away from each other, and both ends of the first pulley are rotatably connected to the middle groove surfaces of the two first channel steels respectively; the opening sides of the two second channel steels face each other, and both ends of each second pulley are rotatably connected to the two opposite side groove surfaces of the corresponding second channel steel respectively.

10. A method for laying a superconducting cable, characterized in that, Applied to the cable trench structure according to any one of claims 1 to 9, the superconducting cable laying method includes: Excavating a trench according to a preset marking, pouring a cushion layer after leveling the foundation; Laying the trough body, filling slag materials on the periphery of the trough body, and piling up on both sides of the top of the trough body; Installing support frames at the bottom of the trough body and controlling the distance between two adjacent support frames; Successively passing the superconducting cable through the laying channels of the support frames, pulling the superconducting cable to a set end point, and controlling the sag of the superconducting cable between two adjacent support frames; Covering the first cover plate on the top of the trough body, covering the second cover plate on the bricklaying, and making the second cover plate flush with the road surface.

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