A sunken cable terminal cable trench

Abstract

This application relates to the technical field of cable trenches, and particularly to a sunken cable terminal trench. It includes a trench body, a cover plate, cables, and a protective device. The cover plate is disposed on the trench body; the protective device is used to protect the cable that is naturally drooping after being secured by clamps. The trench body is divided into a head section and a main body section, which are connected; the head section is not filled with sand, and a downward excavation trench is provided at the head section; the overall trench depth at the head section is greater than the trench depth of the main body section; the main body section is provided with cable supports and is filled with sand; an anti-settlement foundation is laid at the bottom of the downward excavation trench. This application provides a sunken cable terminal trench that increases the cable allowance length, avoids the problem of cable contact and collision with the cable trench cover plate when soft soil settles, and greatly reduces the hidden dangers of clamps.

Description

Technical Field

[0001] This application relates to the technical field of cable trenches, and in particular to a sunken cable terminal cable trench. Background Technology

[0002] Soft soil areas refer to weak, saturated soil layers deposited underwater. Soft soil is characterized by high compressibility, low strength, and poor permeability. Cable trenches in soft soil areas are prone to subsidence and other problems. Therefore, cable trenches in soft soil areas should be selected with appropriate solutions considering factors such as economic efficiency and ease of construction.

[0003] Upward-mounted cables mainly refer to cables that are led from the ground cable trench to the transmission tower, including the cable trench under the terminal tower, cable protection pipe, upward-mounted cable climbing support, upward-mounted cable clamp, cable terminal steel platform, cable terminal head, surge arrester, and drain wire.

[0004] Cables mounted on towers in soft soil areas pose potential hazards. Soft soil is widely distributed in the Nansha suburbs of Guangzhou, and cable trenches at cable terminals in Nansha have shown varying degrees of subsidence. The incidence of cable-mounted hazard in soft soil areas of Nansha is the highest, reaching 62.5%. Furthermore, the number of hazards occurring in soft soil areas of Nansha accounts for as much as 67% of the total number of hazards surveyed, making it a problem that urgently needs to be addressed. Cable-mounted hazard can lead to frequent power outages and power interruptions. Cable line faults can also cause safety accidents such as fires and electric shocks, resulting in significant safety risks. Moreover, cable line maintenance in soft soil areas requires overcoming numerous difficulties, such as foundation treatment and harsh construction environments, leading to high maintenance costs.

[0005] The cable system on the tower in the soft soil area of ​​Nansha was divided into cable protection pipes, cable climbing supports, cable clamps, cable terminal steel platforms, and cable terminal heads according to different connection locations. According to the survey, cable clamps were the most frequent source of hidden dangers in the cable system on the tower, accounting for as high as 74.0%, which is the highest percentage. In other words, cable clamps are the root cause of the high incidence of hidden dangers in the cable system on the tower.

[0006] Experiments revealed that insufficient professional training for construction personnel, incorrect clamp type installation, loose clamp bolts, lack of relevant drawings, and infrequent maintenance of measuring tools were not the primary causes of numerous cable clamp hazards. Instead, insufficient cable length reserved under the tower was the main contributing factor. Even when cable lengths met specifications, instances of cable contact and collision with the cable trench cover were observed.

[0007] After the cable trench is lowered, the trench cover exerts a downward pulling force on the cable. When this force exceeds the cable clamp's capacity, displacement occurs between the clamp and the cable, leading to varying degrees of wear on the cable insulation and deformation of the clamp, posing safety hazards. Related technologies also have shortcomings, such as insufficient cable length allowances, which can cause clamp-related safety issues. Utility Model Content

[0008] To overcome the shortcomings of related technologies, this application provides a sunken cable terminal cable trench.

[0009] A sunken cable terminal trench includes a trench body, a cover plate, a cable, and a protective device. The cover plate is placed on the trench body. The protective device is used to protect the cable that is naturally drooping after being fixed by a clamp. The trench body is divided into a head section and a main body section, which are connected. The head section is not filled with sand and has a lower trench. The overall trench depth of the head section is greater than the trench depth of the main body section. The main body section is equipped with a cable support and is filled with sand. An anti-settlement foundation is laid at the bottom of the lower trench.

[0010] Furthermore, in accordance with the depth of the excavation trench, a cable length of 0.56m-0.58m is reserved.

[0011] Furthermore, the protection device is configured with multiple protection tubes.

[0012] Furthermore, a cable groove is provided on the cover plate, and the protective device is a PVC board, which is placed on the cable groove of the cover plate.

[0013] Furthermore, the end head and the main body are integrally formed, and a partition wall plate is provided between the end head and the main body.

[0014] Furthermore, the main body is designed with a ramp.

[0015] Furthermore, the protective pipe is fixed with cast-in-place C15 concrete.

[0016] Furthermore, the width of the anti-settlement foundation is greater than the width of the bottom of the excavation trench.

[0017] This application has at least one of the following beneficial effects:

[0018] 1. By setting up excavated trenches and increasing the reserved cable length, contact and collision between the cable and the cable trench cover are avoided, thus reducing the potential safety hazards associated with the cable clamps. This prevents the cable trench cover from exerting a downward pulling force on the cable after the cable trench sinks, and avoids displacement between the cable clamp and the cable when the downward pulling force exceeds the cable clamp's bearing capacity, which could lead to varying degrees of wear on the cable insulation and deformation of the clamp, among other safety hazards.

[0019] 2. This application addresses the shortcomings of soft soil, such as high water content, high compressibility, and low bearing capacity, thereby preventing foundation settlement and deformation, avoiding the tilting, sinking, or even collapse that can easily occur when power poles and cable supports are placed on soft soil foundations for a long time, and protecting the safe operation of cable lines.

[0020] 3. The cable trench of this application avoids environmental corrosion, effectively coping with the humid climate, abundant rainfall, and salt spray corrosion in coastal areas, thus reducing the aging process of cables and their accessories. It avoids problems such as cable insulation damage and metal component corrosion, reducing the risk of cable failure. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the cable on the tower in related technologies.

[0022] Figure 2 This is a schematic cross-sectional view of the overall structure of Embodiment 1 of this application.

[0023] Figure 3 This is a side view schematic diagram of the dustproof foundation structure of Embodiment 1 of this application.

[0024] Figure 4 This is a schematic cross-sectional view of the cable support structure according to Embodiment 1 of this application.

[0025] Figure 5 This is a front cross-sectional view of the overall structure of Embodiment 2 of this application.

[0026] Figure 6 This is a top view cross-sectional schematic diagram of the cable groove structure in Embodiment 2 of this application.

[0027] Figure 7 This is a schematic diagram of the left cross-section of the PVC board structure in Embodiment 2 of this application.

[0028] Figure 8 This is a top view cross-sectional schematic diagram of the dustproof foundation structure according to Embodiment 1 of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Trench body; 2. Cover plate; 3. Cable; 4. Hoop; 5. Protective pipe; 6. C15 concrete pouring; 7. Anti-settlement foundation; 8. Cable groove; 9. PVC board; 10. Slope; 11. End head; 12. Main body; 13. Excavated trench; 14. Partition wall panel; 15. Cable bracket; 16. Reinforcing steel. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0031] Reference Figure 1 The term "upper tower cable 3" mainly refers to cable 3 that is led from the ground cable trench to the transmission tower, including the cable trench under the terminal tower, cable protection pipe 5, upper tower cable climbing support, upper tower cable clamp 4, cable terminal steel platform, cable terminal head, surge arrester, and drain wire.

[0032] Example 1:

[0033] Reference Figure 2-4This application discloses a sunken cable 3 terminal cable trench, including a trench body 1, a cover plate 2, a cable 3, and a protective device. The cover plate 2 is disposed on the trench body 1. The protective device is used to protect the cable 3, which hangs naturally after being fixed by a clamp 4. The trench body 1 is divided into an end head 11 and a main body 12, which are connected. In this embodiment, the end head 11 and the main body 12 are integrally formed, and a partition wall 14 is provided between the end head 11 and the main body 12. The end head 11 is not filled with sand, and a lower trench 13 is provided in the end head 11. The overall trench depth of the end head 11 is greater than the trench depth of the main body 12. The main body 12 is provided with a cable support 15 and is filled with sand. The partition wall 14 is used to separate and prevent sand from flowing from the main body 12 to the end head 11. The bottom of the lower trench 13 is laid with an anti-settlement foundation 7. All cable trenches have undergone foundation treatment, which is a cement mixing pile composite foundation. (Refer to...) Figure 3 and Figure 8 The width of the anti-settlement foundation 7 is greater than the width of the bottom of the excavation trench 13 to prevent the soft soil in the cable trench from settling. Multiple steel bars 16 are installed inside the anti-settlement foundation 7, arranged in parallel, further increasing the strength and stability of the foundation. The anti-settlement foundation 7 is not a regular rectangle; instead, trapezoidal grooves are provided on it to reduce the contact area between the bottom of the excavation trench 13 and the foundation 7, reducing the pressure exerted by the excavation trench 13 on the foundation 7 and improving its bearing capacity: it can withstand all loads from the building, including static and dynamic loads, and effectively transfer these loads to the underground soil or rock strata. This design reduces settlement: through the rational design of the anti-settlement foundation 7, uneven settlement that may occur during the use of the cable trench is minimized to avoid damage to the cable trench and buildings on the ground. It also enhances the overall structural stability.

[0034] Increase the reserved length of cable 3 in the cable trench under the tower by more than 500mm; in conjunction with the depth of the excavation trench 13, for example, a cable 3 length of 0.56m-0.58m can be reserved. Setting up the excavation trench 13 and increasing the reserved length of cable 3 avoids contact and collision between cable 3 and the cable trench cover plate 2, reducing potential hazards related to the clamp 4. This prevents the cable trench cover plate 2 from exerting a downward pulling force on the cable 3 after the cable trench sinks, and avoids displacement between the cable clamp 4 and the cable 3 when the downward pulling force exceeds the clamp 4's bearing capacity, which could lead to varying degrees of wear on the cable insulation layer and deformation of the clamp 4, posing safety hazards.

[0035] In this embodiment, a sunken cable trench body is designed using the excavated trench 13 to accommodate excess cable 3. The cable 3 is laid in the sunken cable trench using the following method: multiple protective pipes 5 are used as protection devices. The cable 3, after being fixed by clamps 4, hangs naturally through the protective pipes 5, which are then fixed with cast-in-place C15 concrete. Based on the cable trench settlement, with a maximum settlement of 150mm, the cable trench body allows for a settlement deformation freedom of ≥500mm for the cable 3. The main body 12 is equipped with cable supports 15. The cable 3, passing through the protective pipes 5, hangs naturally in the excavated trench 13 and then enters the main body 12 through the cable supports 15.

[0036] This application increases the reserved length of cable 3 by excavating a trench 13 to increase the distance between cable 3 and cable trench cover 2. By laying cable 3 in a sunken manner, for example by increasing the length of cable 3 by 520mm, the distance between cable 3 and cover 2 increases from the original design of 132mm to 631mm, which increases the vertical distance between cable 3 and cover 2 and reduces the impact of subsequent cable trench settlement on cable 3.

[0037] In related technologies, insufficient reserved length of cable 3 under the tower can easily lead to insufficient space inside the cable trench for cable 3 to be laid. After the cable trench settles, the trench body will contact and collide with the cable 3, causing the cable 3 to be pulled down, resulting in potential hazards to the cable clamp 4. This application increases the reserved length of cable 3 to avoid contact and collision between cable 3 and cable trench cover 2, thus reducing the potential hazards to clamp 4. It also prevents the cable trench cover 2 from exerting a downward pulling force on cable 3 after the cable trench settles, and prevents displacement between cable clamp 4 and cable 3 when the downward pulling force exceeds the bearing capacity of cable clamp 4, which could cause varying degrees of wear on the cable 3 insulation layer and deformation of clamp 4, among other safety hazards.

[0038] Example 2:

[0039] Reference Figure 5 This application discloses a sunken cable 3 terminal cable trench. The difference between this application and Embodiment 1 is that, firstly, a protective pipe 5 is not provided. (Refer to...) Figure 6 The cover plate 2 is provided with a cable groove 8, which is square in shape, and a single cable groove 8 can pass through a single cable. (See reference...) Figure 7The protective device is a PVC board 9, which is placed on the cable groove 8 of the cover plate 2. The PVC material is lighter than the cover plate 2, and it protects the cable 3 when it comes into contact with or collides with the cable trench cover plate 2. Furthermore, the PVC board 9 is easy to replace and maintain. In this embodiment, the end head 11 and the main body 12 are separate parts, not integrally formed. The main body 12 is provided with a ramp 10. No partition wall 14 is provided between the end head 11 and the main body 12. The ramp 10 ensures that even if settlement occurs, the main body 12 will not compress or affect the end head 11, thus avoiding damage to the cable 3. Furthermore, since no partition wall 14 is provided in this embodiment, even if a small amount of sand flows from the main body 12 to the end head 11, it will fall naturally without affecting the end head 11 or the cable 3, saving materials.

[0040] In summary, this application addresses the shortcomings of soft soil, such as high water content, high compressibility, and low bearing capacity, preventing foundation settlement and deformation. It avoids the tilting, subsidence, and even collapse that can easily occur when power poles and cable supports are placed on soft soil foundations for extended periods, thus protecting the safe operation of cable lines. The cable trenches in this application prevent environmental erosion, effectively coping with humid climates, abundant rainfall, and salt spray corrosion in coastal areas, reducing the aging process of cables and their accessories. It avoids problems such as cable insulation damage and metal component corrosion, reducing the risk of cable failure. The sunken cable trench design effectively reduces the impact of cable trench settlement on cables mounted on towers in soft soil areas, reducing the cost of secondary cable modifications and avoiding the use of more expensive foundation treatment methods. It facilitates later inspection and operation, further improving the reliability of cable lines. It reduces the frequency of cable failures on towers in soft soil areas, reducing the occurrence of power outages. It ensures the normal power needs of users and avoids adverse impacts on regional economic development. Sunken cable trenches have a positive impact on later operation, maintenance, relocation, and emergency repairs. They can effectively reduce the hidden dangers of cable clamps on towers, improve the company's design level and corporate image, and enhance social benefits.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sunken cable terminal trench, characterized in that, The system includes a trench body (1), a cover plate (2), a cable (3), and a protective device. The cover plate (2) is placed on the trench body (1). The protective device is used to protect the cable (3) which hangs down naturally after being fixed by the clamp (4). The trench body (1) is divided into an end head (11) and a main body (12), which are connected. The end head (11) is not filled with sand, and a lower trench (13) is provided in the end head (11). The overall trench depth of the end head (11) is greater than the trench depth of the main body (12). The main body (12) is provided with a cable bracket (15) and is filled with sand. An anti-settlement foundation (7) is laid at the bottom of the lower trench (13).

2. The sunken cable terminal cable trench according to claim 1, characterized in that, To match the depth of the excavation trench (13), a cable (3) with a length of 0.56m-0.58m is reserved.

3. The sunken cable terminal cable trench according to claim 1, characterized in that, The protection device is configured with multiple protection tubes (5).

4. The sunken cable terminal cable trench according to claim 1, characterized in that, The cover plate (2) is provided with a cable groove (8), and the protective device is a PVC plate (9), which is placed on the cable groove (8) of the cover plate (2).

5. The sunken cable terminal cable trench according to claim 1, characterized in that, The end head (11) and the main body (12) are integrally formed, and a partition wall plate (14) is provided between the end head (11) and the main body (12).

6. The sunken cable terminal trench according to claim 1, characterized in that, The main body (12) is configured with a ramp (10).

7. The sunken cable terminal cable trench according to claim 3, characterized in that, The protective pipe (5) is fixed with cast-in-place C15 concrete.

8. The sunken cable terminal cable trench according to claim 1, characterized in that, The width of the anti-settlement foundation (7) is greater than the width of the bottom of the excavation trench (13).

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