A new type of multi-circuit cable ring comprehensive inspection well

Abstract

A novel multi-circuit cable ring-type comprehensive inspection well relates to the technical field of inspection wells. The inspection well is excavated downwards to be flush with the cable trench. The invention is characterized in that the inspection well is composed of a residual cable area (1), a cable lead-in area (2), a main inspection area (3), and a terminal pole (4). The residual cable area (1) and the main inspection area (3) form an 8-shaped structure. The cable (6) is laid along the edges of the residual cable area (1) and the main inspection area (3) and finally introduced into the terminal tower through the cable lead-in area (2). The beneficial effect of the invention is that, under the premise of ensuring the safety of various facilities such as cables, trenches, and terminal towers, the external structure of the cable well at the terminal tower is readjusted, and the functionality of the cable well is integrated and optimized.

Description

Technical Field

[0001] The present invention relates to the field of maintenance technology, in particular to a novel multi-circuit cable ring-type comprehensive maintenance well. Background Art

[0002] In practice, many substations cannot run overhead lines due to environmental and land restrictions. Cables must be routed to terminal towers in open areas, where they are then routed via overhead lines. Currently, the vast majority of 110kV cables are laid in cable trenches and tunnels, providing a reliable and secure environment for laying cables. Cable maintenance platforms are also widely used on cable terminal towers, providing reliable access for accessing cable accessories. However, there is no design solution for underground work pits within cable terminal towers that provide sufficient cable maintenance space.

[0003] Terminal towers typically only have cable reserve wells, which serve only to store some spare cables. Most cable lines, from the end of the cable trench to the terminal tower, are laid using direct burial in conduits, branch cable trenches, or circular cable wells. Based on practical engineering experience, these methods have various design flaws and fail to provide adequate cable protection. First, traditional direct burial often results in irregular cable routing, which can lead to crossing and overlapping cables, creating the potential for eddy currents. This reduces the safety level of this section of cable. Second, laying cables in protective conduits makes it difficult to visually observe the cable's operation. If a cable fault occurs in this section, the fault cannot be quickly located, hindering safety hazard detection. Second, the workload required to repair and replace this section of cable is exponentially increased. Finally, there is insufficient maintenance space beneath the tower, and the large-cross-section cables carry a significant weight and are limited by their bending radius. Carrying out maintenance work in narrow cable trenches firstly lacks sufficient space. Repairing and replacing cables or transporting spare cables can cause damage to the cable's insulation, such as collisions and scratches. Secondly, maintenance work inevitably requires more effort and time. Therefore, a maintenance well that can improve the safe operation environment of cables under terminal towers while providing ample space for cable maintenance is needed to meet the actual needs of the project. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention proposes a novel multi-circuit cable ring-type comprehensive inspection well. The inspection well is dug downward to be flush with the cable trench. Its structure is as follows: it consists of a residual cable area (1), a cable lead-in area (2), a main inspection area (3), and a terminal rod (4). The residual cable area (1) and the main inspection area (3) form an 8-shape. The cable (6) is laid along the edges of the residual cable area (1) and the main inspection area (3) through a cable bracket (5), and finally introduced into the terminal rod (4) through the cable lead-in area (2). The terminal rod (4) is placed in the center of the main maintenance area (3), and the cable bracket (5) is fixed to the wall formed by the remaining cable area (1), the cable lead-in area (2) and the edge of the main maintenance area (3) by bolts. The cable bracket (5) can be set to be L-shaped, and the right-angled side of the cable bracket (5) is fixed to the wall, and the other side is used to fix the cable (6). The cable lead-in area (2) is set symmetrically on both sides of the main maintenance area (3). The cable lead-in area (2) is reserved with a through hole for the cable (6), and the remaining parts are covered with a cover plate.

[0005] Cable supports (5) are provided at the edges of the remaining cable area (1), the cable leading area (2) and the main maintenance area (3), and the cable supports (5) are provided with multiple layers.

[0006] The edges of the remaining cable area (1), the cable lead-up area (2) and the main maintenance area (3) are made of cast-in-situ reinforced concrete or brickwork.

[0007] The beneficial effects of the present invention are: under the premise of ensuring the safety of various facilities such as cables, trenches, and terminal towers, the external structure of the cable well at the terminal tower is readjusted, and the functionality of the cable well is integrated and optimized. The cable well is divided according to its function, and the spatial layout inside the cable well is reasonably divided. It not only realizes that the cable line is laid in the cable trench from the substation cable trench to the terminal tower. It improves the safety of cable line operation. It is convenient to check and find the fault point, and sufficient maintenance space is reserved in the trench, providing sufficient maintenance space for cable maintenance work in the trench. Under the premise of combining the above functionality, the overall protection of the cable trench is not destroyed, and the possibility of application in various environments is guaranteed. The characteristics of the external structure are fully utilized, and the size of the cable well can be flexibly adjusted according to the size of the terminal tower foundation. It can not only reduce the land used for engineering construction but also maximize the use of engineering investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0009] Figure 2 It is a schematic diagram of the plane outline of the present invention;

[0010] Figure 3 It is a longitudinal sectional view of the present invention;

[0011] Figure 4 It is an overall longitudinal sectional view of the present invention;

[0012] Figure 5 This is a cross-sectional view of the inspection well of the present invention;

[0013] Figure 6 This is a cross-sectional view of the cable support for the inspection well of the present invention.

[0014] In the figure: 1. Remaining cable area, 2. Cable lead-in area, 3. Main maintenance area, 4. Terminal pole, 5. Cable bracket, 6. Cable. DETAILED DESCRIPTION

[0015] Example 1, by Figures 1 to 6 The invention is further explained in detail. The main technical problem it solves is that the existing processing method is that there is a blind spot in the inspection of the cable laying method between the end of the cable trench under the cable terminal tower and the cable terminal of the terminal tower. Most of this section of cable is generally laid by direct burial or protective pipe from the cable trench to the ground; as a result, this section of cable cannot be visually checked for fault points; once a problem occurs in this section of cable, the fault point can only be checked after excavation, resulting in an exponential increase in the workload of cable maintenance, which greatly affects work efficiency and increases power outage time.

[0016] Most cable ring shafts are constructed with a cable trench surrounding a terminal tower. The primary purpose of the cable trench and tunnel is to provide safe and reliable operating space for the cables. However, since larger cross-section cable trenches and tunnels increase project investment, the cross-sectional dimensions of the cable trenches are generally compact. The trenches require space for cable mounting brackets and passage for maintenance personnel, which complicates the already tight space. Furthermore, the heavy weight of the cables, coupled with their bending radius, makes replacing cable accessories and transporting them within the trenches extremely labor-intensive. Furthermore, the limited space within the trenches prevents the use of some larger tools and equipment. This significantly limits the efficiency of cable maintenance work within the trenches.

[0017] The portion of the cable under the terminal tower cannot always be laid in the entire trench. The cable from the cable trench to the ground is in a protective tube or directly laid in the soil. When it is necessary to replace the spare cable or repair the cable, there will inevitably be a large amount of excavation work. The excavation may cause loss or damage to the cable. Therefore, providing an environment for laying the cable in the entire trench can not only improve the efficiency of construction and maintenance, but also greatly improve the safety environment of cable operation. A novel multi-circuit cable ring-type comprehensive maintenance well has the following structure: it is composed of a residual cable area (1), a cable lead-in area (2), a main maintenance area (3), and a terminal rod (4); the residual cable area (1) and the main maintenance area (3) form an 8-shaped structure; the purpose of such arrangement is to adjust the tightness or margin of the cable (6) in the residual cable area (1); the cable (6) is laid along the edges of the residual cable area (1) and the main maintenance area (3) through a cable bracket (5); the purpose of such arrangement is to make the cable (6) more orderly, easier to mark and inspect in a well with many cables, and convenient and quick during maintenance; finally, the cable is introduced to the terminal rod (4) through the cable lead-in area (2); the purpose of such arrangement is to better overcome the currently commonly used cable pipe-threading method, and to facilitate maintenance. The terminal rod (4) is placed in the center of the main maintenance area (3) and is rationally arranged. The cable bracket (5) is fixed to the wall of the remaining cable area (1), the cable lead-in area (2) and the edge of the main maintenance area (3) by bolts. The cable bracket (5) can be set to L shape. The purpose of such arrangement is to make the cable bracket (5) more secure. The right-angled side of the cable bracket (5) is fixed to the wall, and the other side is used to fix the cable (6). The right-angled side is fixed along the wall to fix the cable (6). The cable lead-in area (2) is set symmetrically on both sides of the main maintenance area (3). Such arrangement is simple and the cable path is the shortest. The cable lead-in area (2) reserves a through hole for the cable (6), and the rest of the parts are covered with a cover plate to prevent animals and pedestrians on the ground from falling. Cable supports (5) are provided at the edges of the remaining cable area (1), the cable leading area (2) and the main maintenance area (3). The cable supports (5) are provided with multiple layers, which effectively utilizes space and can also be used in pipe corridors, such as gathering cables, water pipes, optical fibers, etc. together to save space on the ground.

[0018] The edges of the remaining cable area (1), the cable leading area (2) and the main maintenance area (3) are made of cast-in-situ reinforced concrete or brickwork, which can ensure the strength of the edges and prevent collapse.

Claims

1. A new type of multi-circuit cable ring-type comprehensive inspection well, the inspection well is dug down to the same level as the cable trench, characterized by: The utility model comprises a surplus cable area (1), a cable leading area (2), a main maintenance area (3), and a terminal rod (4). The surplus cable area (1) and the main maintenance area (3) form an 8-shaped structure. The cable (6) is laid along the edges of the surplus cable area (1) and the main maintenance area (3) through a cable bracket (5), and finally introduced into the terminal rod (4) through the cable leading area (2). The terminal rod (4) is placed in the center of the main maintenance area (3). The cable bracket (5) is fixed to the wall formed by the surplus cable area (1), the cable leading area (2) and the edge of the main maintenance area (3) by bolts. The cable bracket (5) can be set to an L-shape. The right-angle side of the cable bracket (5) is fixed to the wall, and the other side is used to fix the cable (6). The cable leading area (2) is symmetrically arranged on both sides of the main maintenance area (3). The cable leading area (2) is reserved with a through hole for the cable (6), and the remaining parts are covered with a cover plate.

2. A novel multi-circuit cable ring type comprehensive inspection well according to claim 1, characterized in that: Cable supports (5) are provided at the edges of the remaining cable area (1), the cable leading area (2) and the main maintenance area (3), and the cable supports (5) are provided with multiple layers.

3. The novel multi-circuit cable ring type comprehensive inspection well according to claim 1 is characterized in that: The edges of the remaining cable area (1), the cable lead-up area (2) and the main maintenance area (3) are made of cast-in-situ reinforced concrete or brickwork.

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