A cable trench sump for explosive environments

Abstract

The application discloses a cable trench water collecting well for an explosion-hazardous environment and belongs to the technical field of cable laying supporting facilities of electrical engineering. The cable trench water collecting well comprises a cable trench and a water collecting well arranged at the side of the cable trench. The water collecting well is arranged adjacent to the cable trench, and a common wall structure is formed between the water collecting well and the cable trench. The common wall structure is integrally or partially made of water-permeable sand-blocking masonry material, so that water accumulated in the cable trench enters the water collecting well through the water-permeable sand-blocking masonry material, and the filling sand in the cable trench is blocked in the cable trench, thereby realizing water collecting and sand blocking, effectively solving the problem of the loss of the filling sand in the cable trench during the drainage of the cable trench, and simultaneously, the side of the water-permeable sand-blocking material towards the water collecting well is surface treated by using a hydrophobic silane coupling agent or a hydrophobic material with the same characteristics, so that the side of the water inlet of the water collecting well has a one-way hydrophobic characteristic, and the water accumulated in the water collecting well is prevented from flowing back into the cable trench.

Description

Technical Field

[0001] This invention belongs to the technical field of electrical engineering cable laying supporting facilities, specifically relating to a cable trench water collection well for use in explosive hazardous environments. Background Technology

[0002] In flammable and explosive areas and locations such as metallurgy, chemical industry, refining, gas extraction, pharmaceuticals, and warehousing, there are often situations where combustible gases, vapors, or dust mix with air to form explosive mixtures. These areas are typically classified as hazardous explosion environments. A significant proportion of fires and explosions are caused by cables overheating or short circuits due to insulation damage. According to national mandatory regulations and relevant standards, when combustible materials are heavier than air, cable trenches should be filled with sand and have drainage measures to effectively prevent fires and explosions caused by cable combustion.

[0003] In general or non-explosive environments, drainage of cable trenches is typically achieved by installing conventional sump pits near the trench and connecting the trench to the sump pits via sidewall openings or drainage pipes. This type of structure can meet drainage requirements in environments where sand filling is not required.

[0004] However, in explosive environments, cable trenches are typically filled with gravel to prevent the accumulation and spread of flammable media and improve explosion-proof safety. If the existing open-cut or drainage pipe-type water collection well solution is still used, the following problems will arise:

[0005] The inlet of the water collection well is usually located at the bottom or low-lying area of ​​the cable trench. Under the influence of water erosion and gravity, the sand and gravel in the cable trench are easily migrated to the inlet and accumulate. In severe cases, the sand and gravel will enter the water collection well with the water, causing the sand in the cable trench to be lost, weakening or even losing the original explosion-proof protection effect. Gravel accumulating in the inlet area over a long period of time can easily cause blockages and affect drainage. At the same time, open inlets are exposed to the external environment, and debris, small animals, etc. can easily enter the collection well or cable trench, causing blockages and aging or damage to cables, increasing safety risks. To maintain the amount of sand filling and smooth drainage in the cable trench, it is necessary to regularly open a large number of trench covers for inspection, sand replenishment, dredging, and repair of blockages. The maintenance workload is large and the maintenance cost is high. In addition, frequent maintenance may also damage the outer sheath of the cable.

[0006] Currently, while existing standards stipulate that cable trenches in explosive hazardous environments should be filled with sand and preferably have drainage measures, they do not provide specific structural forms and solutions for cable trench water collection wells suitable for such environments. Therefore, there is an urgent need for a water collection well structure and solution that can effectively collect water accumulated in cable trenches, prevent the loss of sand from the cable trench, and reduce inlet blockage and maintenance requirements.

[0007] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0008] To address the problems of sand loss, inlet blockage, frequent maintenance, and inability to balance drainage and explosion protection in existing water collection wells used in explosive environments, this invention provides a cable trench water collection well for use in explosive environments.

[0009] The present invention provides a cable trench water collection well for use in explosive atmospheres, comprising a cable trench and a water collection well disposed on the side of the cable trench: The water collection well is arranged adjacent to the cable trench, and the water collection well and the cable trench form a shared wall structure; The shared wall structure is made wholly or partially of a permeable sand-blocking material, so that the water accumulated in the cable trench enters the water collection well through the permeable sand-blocking material, while the gravel filling the cable trench is blocked in the cable trench.

[0010] In one embodiment, the shared-wall structure constitutes the inlet of the water collection well, and the inlet is a closed structure.

[0011] In one embodiment, the water inlet is made of a permeable and sand-blocking material, preferably one or more of sand-based permeable bricks, sintered porous ceramics, and porous concrete slabs, as well as other masonry materials with the same properties.

[0012] In one embodiment, the shared wall structure is formed by a portion of the sidewalls adjacent to the water collection well and the cable trench, wherein the portion of the sidewalls is constructed using the permeable sand-blocking material, and the remaining portion is constructed using a non-permeable structure.

[0013] In one embodiment, the cable trench is filled with a layer of gravel for cable protection in explosive atmospheres, the gravel layer being located around and / or above and below the cable.

[0014] In one embodiment, the pore size of the permeable sand-blocking material is smaller than the particle size of the gravel filling the cable trench, so that the accumulated water can enter the water collection well through the permeable sand-blocking material, while the gravel cannot pass through the permeable sand-blocking material.

[0015] In one embodiment, the water collection well is located at a low longitudinal position in the cable trench or on the side of an area prone to water accumulation.

[0016] In one embodiment, the water collection well is provided with a drainage pump installation space, a drainage pipe interface and / or an inspection port.

[0017] In one embodiment, the water inlet sidewall is installed in the common wall structure by means of masonry, prefabrication, or embedding.

[0018] In one embodiment, the permeable sand-blocking material is surface-treated with a hydrophobic silane coupling agent or a hydrophobic material with the same properties on the side facing the water collection well, so that the water inlet side of the water collection well has hydrophobic properties to water accumulated outside the cable trench.

[0019] In one embodiment, the hydrophobic silane coupling agent is one or more of the following: aqueous silane / siloxane emulsion, isooctyltriethoxysilane, and isobutyltriethoxysilane; And / or, the amount of the hydrophobic silane coupling agent is 100–300 g / m³. 2 The preferred concentration is 150–250 g / m³. 2 .

[0020] Alternatively, the hydrophobic silane coupling agent may penetrate to a thickness of 3–10 mm in the permeable sand-blocking material.

[0021] Compared with existing technologies, the technical effects achieved by this invention are as follows: (1) The present invention sets the adjacent sidewall between the water collection well and the cable trench as a water-permeable sand-blocking structure, so that the water can enter the water collection well through the sidewall, while the sand and gravel filling the cable trench cannot pass through the sidewall to enter the water collection well, thereby achieving "water collection and sand fixation" and effectively preventing the loss of sand and gravel filling the cable trench.

[0022] (2) By eliminating the traditional open water inlet hole and adopting a closed water inlet structure, the present invention can avoid the problem of sand and gravel accumulating locally in the water inlet in the existing open structure and reduce the risk of water inlet blockage.

[0023] (3) By using the entire or part of the sidewall as the water inlet area, the present invention can significantly increase the water inlet area, improve the water collection efficiency, and improve the drainage effect.

[0024] (4) Since the water inlet structure of this invention is a closed structure, it can prevent foreign objects, small animals and other objects from entering the cable trench, thereby reducing the risk of contamination or damage to the cables in the trench.

[0025] (5) This invention can reduce the frequency of maintenance operations such as opening the cable trench for inspection, replenishing sand, dredging and restoring the seal, reduce the maintenance workload and maintenance cost, and is suitable for long-term stable operation.

[0026] (6) The surface of the inlet of the cable trench water collection well is treated with a hydrophobic silane coupling agent, so that the water inlet of the water collection well facing the water collection well has hydrophobic properties, which effectively avoids the problem of water backflow into the cable trench when there is no water in the cable trench but there is water on the side of the water collection well and when the water level is higher than the water inlet of the cable trench water collection well.

[0027] (7) The present invention can simultaneously meet the requirements of sand filling for explosion prevention and drainage in cable trenches in explosive hazardous environments, and has good engineering application value. Attached Figure Description

[0028] Figure 1 This is a schematic diagram (I) of the structure of a cable trench water collection well used in an explosive hazardous environment according to Embodiment 1 of the present invention. Figure 2 This is a schematic diagram (II) of the structure of a cable trench water collection well used in an explosive hazardous environment according to Embodiment 1 of the present invention. Figure 3 This is a schematic diagram of the inlet structure of the cable trench water collection well in Embodiment 3 of the present invention; Figure 4 This is a schematic diagram (I) of the structure of a cable trench water collection well used in an explosive hazardous environment in Embodiment 3 of the present invention. Figure 5 This is a schematic diagram (II) of the structure of a cable trench water collection well used in an explosive hazardous environment in Embodiment 3 of the present invention. In the picture: 1-Cable trench; 2-Gravel filling; 3-Water collection well; 4-Shared wall structure of water inlet; 5-Hydrophobic layer formed by treatment with hydrophobic silane coupling agent. Detailed Implementation

[0029] The technical solution of the present invention will be described below with reference to the accompanying drawings and specific embodiments. It should be understood that one or more steps mentioned in the present invention do not preclude the existence of other methods and steps before or after the combined steps, or that other methods and steps may be inserted between these explicitly mentioned steps. It should also be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the invention. Unless otherwise stated, the numbering of each method step is only for the purpose of identifying each method step, and not for limiting the order of each method or limiting the scope of the invention. Changes or adjustments to their relative relationships, without substantial changes to the technical content, can also be considered within the scope of the present invention.

[0030] The raw materials and instruments used in the examples are not subject to any specific restrictions on their source; they can be purchased from the market or prepared according to conventional methods known to those skilled in the art.

[0031] Example 1 like Figure 1 and Figure 2 As shown, this embodiment provides a cable trench water collection well for use in explosive hazardous environments, including a cable trench 1 and a water collection well 3.

[0032] Cable trench 1 is a cable laying facility structure used to accommodate and place cables. The upper part of cable trench 1 is covered by a cover plate. According to the requirements for cable laying in explosive hazardous environments, after the cable laying is completed, cable trench 1 should be filled with gravel 2. The gravel 2 is located above and / or below the cables to fill the gaps between the cable trench and the cables in the trench, preventing the accumulation and spread of flammable gases or dust, and playing a role in explosion protection.

[0033] A water collection well 3 is located on the side of the cable trench 1 and is arranged adjacent to the cable trench 1. In this embodiment, the water collection well 3 and the cable trench 1 adopt a shared wall structure 4, that is, the adjacent sidewalls between them are shared sidewalls. The shared sidewall is constructed entirely of permeable sand-blocking material to form a water inlet structure. There is no traditional open water inlet structure or communication method between the water collection well 3 and the cable trench 1. The water inlet structure is a closed water inlet structure.

[0034] The preferred permeable and sand-blocking material is sand-based permeable brick. Sand-based permeable bricks possess high strength and good permeability. They form a microporous structure within the brick, allowing water to pass through. Made primarily of sand, they are a novel building paving material produced through a non-sintering extrusion process. By altering the surface tension of water, they achieve permeability, resolving the contradiction between strength and permeability in traditional permeable materials. Sand-based permeable bricks reduce the surface tension of water through physical modification, allowing water to rapidly permeate the brick structure under capillary action. The micropore diameter is controlled within the range of 20-200 micrometers, effectively preventing dust from entering while maintaining unobstructed water channels. The compressive strength can reach over 60 MPa, and the permeability coefficient is ≥1×10⁻⁶. -2 cm / s, a dense surface layer effectively prevents particulate matter deposition, has long-lasting anti-clogging performance, a water permeability of over 15 years, freeze-thaw resistance (-40℃ to 60℃), and a permeability of up to 90%; the diameter of water molecules is approximately 0.4 nanometers; for filling cable trenches in explosive hazardous environments, fine or medium sand with a particle size of 0.5-1.5 mm is typically selected to ensure dense filling without large particle impurities.

[0035] In this embodiment, the diameter of water molecules is less than the diameter of micropores on the surface of the sand-based permeable brick, which is less than the diameter of the gravel used for filling.

[0036] The volume difference between water molecules, sand-based permeable bricks, and sand-filled gravel is on the order of a thousand times. Therefore, the following conclusions can be drawn: (1) Water molecules have the smallest diameter and can flow through the gaps between the sand and gravel; (2) The diameter of the micropores on the surface of the sand-based permeable bricks is between the diameter of water molecules and the diameter of sand and gravel, so water molecules can pass through the micropores. However, the sand and gravel, because their volume is larger than the micropores on the surface of the permeable bricks, cannot pass through the micropores on the surface of the sand-based permeable bricks and cannot flow out through the micropores of the sand-based permeable bricks into the collection well. That is, the equivalent flow size of the micropore structure is smaller than the particle size of the sand and gravel filling the cable trench 1, so that the accumulated water can pass through the common wall structure 4 into the collection well 3, while the sand and gravel in the sand and gravel filling 2 cannot pass through the common wall structure into the collection well 3.

[0037] When water accumulates in the cable trench 1, it passes through the permeable sand-blocking material under the influence of gravity, water level difference, and the permeability of the material, and enters the collection well 3. Because the permeable pore size of the permeable sand-blocking material is smaller than the particle size of the gravel in the filling gravel 2, the gravel cannot pass through the permeable sand-blocking material and is thus retained in the cable trench 1. Therefore, this embodiment can prevent sand loss while draining the accumulated water, achieving water-sand separation and water collection and sand fixation.

[0038] In addition, since the entire shared wall structure is used as the water inlet structure, its water inlet area is significantly larger than that of the traditional single-opening water inlet, which can improve the efficiency of water collection and reduce the risk of local blockage.

[0039] Example 2 The difference between this embodiment and embodiment 1 is that the common wall structure 4 is not entirely composed of permeable sand-blocking material for the entire adjacent sidewalls, but only permeable sand-blocking material is set in a part of the adjacent sidewalls, and the remaining areas are made of non-permeable structure.

[0040] This implementation method is suitable for engineering scenarios where the expected water accumulation is relatively small, the site layout is limited, or structural strength and cost control must be considered. By rationally setting the area, masonry location, and shape of the permeable area according to factors such as the expected water accumulation, flow direction, and construction conditions in the cable trench, the water collection well 3 can effectively collect the water accumulated in the cable trench 1 and prevent the loss of gravel.

[0041] Example 3 like Figures 3-5 As shown, the difference between this embodiment and Embodiment 1 is that: a hydrophobic layer 5, formed by treatment with a hydrophobic silane coupling agent, is provided on the side of the permeable sand-blocking material facing the water collection well. The hydrophobic silane coupling agent is an aqueous silane / siloxane emulsion, isooctyltriethoxysilane, isobutyltriethoxysilane, or a combination thereof, and the dosage of the hydrophobic silane coupling agent is 100-300 g / m³. 2 The preferred concentration is 150–250 g / m³. 2 .

[0042] The specific steps of the single-sided shallow hydrophobic treatment method for permeable sand-blocking materials are as follows: Clean and dry the water-facing surface (the side facing the collection well) of the sand-based permeable brick or other porous permeable material to be treated; shield, seal, or isolate the untreated surface; apply the hydrophobic silane coupling agent to the water-facing surface by brushing, rolling, or low-pressure spraying, ensuring that the hydrophobic silane coupling agent only penetrates the surface area of ​​the porous permeable material and forms a shallow hydrophobic layer; after construction, allow natural curing for 24–48 hours, avoiding rain, water rinsing, or soaking during the curing period. This allows the hydrophobic silane coupling agent to solidify and bond with the material surface. The water-facing side of the permeable sand-blocking material forms a water-repellent and water-blocking surface, while the back side (the side facing the cable trench) remains untreated and retains its hydrophilic and permeable properties, allowing water to pass unidirectionally from the back side to the front side, while preventing or reducing the reverse permeation of water from the front side to the back side, thereby achieving unidirectional water permeability or unidirectional water guidance.

[0043] When the permeable sand-blocking material is installed, the hydrophobic and water-blocking surface faces the water collection well side or the outer water inlet side, and the untreated hydrophilic and permeable surface faces the cable trench side, so that water from the cable trench side can enter the permeable sand-blocking material and be discharged to the water collection well side, while inhibiting water from the water collection well side from flowing back into the cable trench side.

[0044] Example 4 The difference between this embodiment and Embodiment 2 is that: a hydrophobic layer 5, formed by treatment with a hydrophobic silane coupling agent, is provided on the side of the permeable sand-blocking material facing the water collection well. The hydrophobic silane coupling agent is an aqueous silane / siloxane emulsion, isooctyltriethoxysilane, isobutyltriethoxysilane, or a combination thereof, and the dosage of the hydrophobic silane coupling agent is 100-300 g / m³. 2 The preferred concentration is 150–250 g / m³. 2 .

[0045] When the shared wall structure is installed, the hydrophobic and water-blocking surface faces the water collection well side or the outer water inlet side, and the untreated hydrophilic and permeable surface faces the cable trench side, so that water from the cable trench side can enter the permeable sand-blocking material and be discharged to the water collection well side, while inhibiting water from the water collection well side from flowing back into the cable trench side.

[0046] Silane coupling agents are a class of organosilicon compounds with a bifunctional structure that can form "molecular bridges" between inorganic and organic polymer materials, thereby significantly improving the water resistance, weather resistance, and mechanical properties of composite materials. A dense siloxane film forms on the surface of materials treated with silane coupling agents. This film has excellent hydrophobicity, effectively preventing the penetration of moisture, oxygen, and other corrosive media, thus significantly improving the material's water resistance, weather resistance, and chemical corrosion resistance. Coating the surface of permeable sand-blocking materials with silane coupling agents can form a waterproof membrane, preventing moisture from penetrating the interior of the permeable sand-blocking material, reducing the risk of steel reinforcement corrosion and cracking of the permeable sand-blocking material, and extending the service life of the permeable sand-blocking material structure.

[0047] In other embodiments, the permeable and sand-blocking material is not limited to sand-based permeable bricks; other permeable materials with the same or similar permeability and sand-blocking properties as sand-based permeable bricks can also be used. The material is acceptable as long as it meets the following requirements: (1) It has sufficient structural strength to be used as the wall structure between the cable trench and the water collection well for a long time; (2) It has stable water permeability, so that water accumulated in the cable trench can pass through effectively; (3) It has the ability to block sand, so that the sand and gravel filling the cable trench cannot penetrate it; (4) It has good durability, anti-clogging ability and environmental adaptability.

[0048] Preferred permeable and sand-blocking materials include, but are not limited to, sintered porous ceramics and fiber-reinforced porous cement substrates.

[0049] This invention utilizes the water-permeable and sand-blocking properties of permeable and sand-blocking materials to achieve water and sand separation. Specifically, water can enter the collection well through the internal pores of the permeable and sand-blocking material, while larger sand particles are blocked inside the cable trench, thus avoiding the problem of sand and gravel being lost with water in traditional open-pore structures. Simultaneously, because this invention expands the inlet area from a partial opening in existing technologies to the entire common wall sidewall or a large portion thereof, it effectively increases the inlet area, reduces the flow velocity per unit area, and lowers the risk of sand and gravel accumulating and hardening in localized areas, thereby improving water collection efficiency and reducing clogging. The inlet structure is a closed structure, preventing external debris, small animals, etc., from entering the cable trench through the inlet, further improving the system's operational safety and reliability.

[0050] The present invention is not limited to the above-described embodiments. Without departing from the core concept of the present invention, the following adjustments can be made: The installation range of permeable sand-blocking materials can be selected as the entire adjacent sidewall or a local area, depending on the expected water accumulation, project layout and drainage requirements. The size, shape, and location of the permeable area can be adjusted according to the actual working conditions; The plan shape, depth, volume, and subsequent drainage method of the water collection well can be configured according to conventional engineering design requirements; Permeable sand-blocking materials can be any equivalent material that can achieve the effect of water permeability and sand blocking.

[0051] This invention employs a shared wall structure between the water collection well and the cable trench, reducing the distance between them and minimizing the resistance generated by the flow of accumulated water into the water collection well. The "water-permeable, sand-blocking" properties of the sand-based permeable brick material achieve water-sand separation, enabling the water collection well in the cable trench in explosive hazardous environments to effectively collect accumulated water while preventing sand loss, thus achieving the effect of "water collection and sand fixation." Because the entire sidewall of the water collection well adjacent to the cable trench is constructed using sand-based permeable bricks, and the entire sidewall serves as the water inlet, this structural form significantly increases the inlet area of ​​the water collection well compared to existing solutions, improving the efficiency of water collection. The existing open-style sidewall structure between the cable trench and the sump has been eliminated. The sump inlet now features a closed structure. This eliminates the problem of impurities adhering to the open inlet, which allows sand and gravel to dry and harden, causing blockages in the sump inlet and drainage channels of the cable trench, thus hindering water collection. Furthermore, the closed inlet prevents foreign objects or small animals from entering the cable trench and damaging the cables. This allows the cable trench to operate maintenance-free, significantly reducing daily maintenance workload and costs.

[0052] To ensure that most of the water in the cable trench is drained in the shortest possible time when it is filled, preventing the cables from being submerged for extended periods, the inlet of the cable trench's sump should be located at the lowest point of the trench. This ensures that the water flows towards the sump's inlet. To further enhance drainage, the cable trench floor should have a slope that descends from the cable trench towards the sump. This ensures the sump's inlet is at the lowest point of the entire trench, utilizing the elevation difference between the trench and the sump to increase the water's potential energy and kinetic energy. This ensures the water always flows towards the sump, regardless of the water level. Therefore, regardless of the water level in the trench, the water will always converge towards the sump and drain into it through the inlet.

[0053] After the inlet of the water collection well is constructed, a hydrophobic silane coupling agent or similar hydrophobic material is applied to one side of the well for surface treatment, giving the inlet side hydrophobic properties. After treatment, the inlet of the water collection well possesses unidirectional hydrophobic properties, improving the hydrophobicity of the other side of the well without affecting its hydrophilicity. This effectively prevents backflow of water into the cable trench when there is no water in the cable trench but water accumulates on one side of the well, and the water level is higher than the inlet. This invention is applicable to water collection well solutions for cable trenches in explosive hazardous environments. The inlet of the water collection well adopts a closed structure, using the entire sidewall of the well as the inlet. This prevents sand loss from the cable trench and also prevents external foreign objects, animals, and accumulated water from entering the cable trench, achieving maintenance-free cable trench operation and significantly reducing daily production maintenance workload and costs.

[0054] The inlet of the cable trench water collection well is constructed using a sand-based permeable brick masonry structure, which enables the water collection well inlet to separate water and sand, achieving the function of "water flow and sand blocking". At the same time, compared with the existing scheme, it makes full use of the usable area of ​​the structure, maximizes the cross-sectional area of ​​the water collection well inlet, minimizes water flow resistance, thereby improving the water collection efficiency of the water collection well, and also avoids the occurrence of siltation at the water collection well inlet.

[0055] Based on the above structural features and technical characteristics of the cable trench water collection well of the present invention, this technical solution is particularly applicable to the field of electrical engineering in industrial and civil explosive hazardous environments.

[0056] This invention is applicable not only to outdoor cable trenches, but also to indoor cable trenches where water may accumulate, such as in pump rooms.

[0057] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A cable trench water collection well for use in explosive atmospheres, characterized in that, Includes a cable trench and a water collection well located on the side of the cable trench. The water collection well is arranged adjacent to the cable trench, and the water collection well and the cable trench form a shared wall structure; The shared wall structure is made wholly or partially of a permeable sand-blocking material, so that the water accumulated in the cable trench enters the water collection well through the permeable sand-blocking material, while the gravel filling the cable trench is blocked in the cable trench.

2. The cable trench water collection well for explosive atmospheres according to claim 1, characterized in that, The shared wall structure constitutes the inlet structure of the water collection well, and the inlet structure is a closed inlet structure.

3. The cable trench water collection well for explosive atmospheres according to claim 1, characterized in that, The water inlet is made of permeable and sand-blocking material, preferably one or more of sand-based permeable bricks, sintered porous ceramics, and porous concrete slabs, as well as other masonry materials with the same properties.

4. The cable trench water collection well for explosive atmospheres according to claim 1, characterized in that, The shared-wall structure is composed of a portion of the sidewall adjacent to the water collection well and the cable trench. The portion of the sidewall is constructed using the permeable sand-blocking material, while the remaining portion is constructed using a non-permeable structure.

5. The cable trench water collection well for explosive atmospheres according to claim 1, characterized in that, The cable trench is filled with a layer of gravel for protection against explosive atmospheres, and the gravel layer is located around and / or above and below the cable.

6. The cable trench sump well for explosive atmospheres according to claim 5, characterized in that, The pore size of the permeable sand-blocking material is smaller than the particle size of the gravel filling the cable trench, so that the accumulated water can enter the water collection well through the permeable sand-blocking material, while the gravel cannot pass through the permeable sand-blocking material.

7. The cable trench water collection well for explosive atmospheres according to claim 1, characterized in that, The water collection well is located at the lower longitudinal position of the cable trench or on the side of an area prone to water accumulation.

8. The cable trench sump well for use in explosive atmospheres according to claim 1, characterized in that, The permeable sand-blocking material is surface-treated with a hydrophobic silane coupling agent or a hydrophobic material with the same properties on the side facing the water collection well, so that the water inlet side of the water collection well has hydrophobic properties to the water accumulated outside the cable trench.

9. The cable trench sump well for explosive atmospheres according to claim 8, characterized in that, The hydrophobic silane coupling agent is one or more of the following: aqueous silane / siloxane emulsion, isooctyltriethoxysilane, and isobutyltriethoxysilane.

10. The cable trench sump well for explosive atmospheres according to claim 8, characterized in that, The amount of the hydrophobic silane coupling agent used is 100-300 g / m³. 2 The preferred concentration is 150–250 g / m³. 2 .

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