A precast concrete cable shaft

Abstract

The utility model discloses a kind of precast concrete cable well, it is related to cable well technical field, including prefabricated part, the outer wall of the prefabricated part is equipped with lifting lug, the top of the prefabricated part is equipped with sealing groove, the top of the prefabricated part is equipped with cover plate, the top of the cover plate is equipped with access hole, the bottom of the cover plate is equipped with expansion waterstop, the sidewall of the prefabricated part is equipped with wire groove, the bottom of the prefabricated part is equipped with filter plate, the bottom of the filter plate is equipped with drainage groove.The utility model is equipped with fixing frame, fixed rod and support sleeve, fixed rod is threaded into the inside of fixed rod and the inner sidewall of prefabricated part is connected, then cable is threaded into the inside of support sleeve, the setting of support sleeve supports middle section of cable, avoid the phenomenon of "sag" due to gravity for long time use of middle section of cable, to cause cable and ground or other structures rub, cause insulating layer damage, cause electric leakage, short circuit.

Description

Technical Field

[0001] This utility model relates to the field of cable well technology, specifically a precast concrete cable well. Background Technology

[0002] Cable wells are important structures in power transmission and distribution construction. Existing precast concrete cable wells lack drainage structures, making them prone to water accumulation. Prolonged immersion of cables affects their lifespan. Furthermore, the weight of the cables causes them to sag in the middle section over time, creating a "sagging" phenomenon. This sag, caused by friction with the well wall, ground, or other structures, leads to thinning and cracking of the insulation layer, potentially exposing the internal conductors and causing short circuits and electrical leakage. To address these issues, a new type of precast concrete cable well is needed.

[0003] An existing type of precast concrete cable well has poor sealing at the joints of its components, allowing groundwater to seep in along the gaps and accumulate at the bottom of the well. This causes the internal cables to be submerged for extended periods, affecting their lifespan. Furthermore, the lack of effective support for the cables inside the well leads to sag in the middle sections due to gravity over time. This sag causes friction with the ground or other structures, resulting in cracks in the insulation layer and increasing the risk of short circuits and electrical leakage. Therefore, there is an urgent need for a new type of precast concrete cable well. Summary of the Invention

[0004] Based on this, the purpose of this utility model is to provide a precast concrete cable well to solve the problems of poor sealing at the joints of existing precast concrete cable wells, which allows groundwater to seep in along the gaps and accumulate at the bottom of the cable well, causing the internal cables to be soaked for a long time, affecting the service life of the cables; the lack of effective support for the cables inside the cable well, causing the middle section of the cable to sag due to gravity after long-term use, and friction with the ground or other structures, resulting in cracks in the insulation layer, which can easily lead to short circuits and leakage accidents.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a precast concrete cable well, comprising a precast component, a lifting lug installed on the outer wall of the precast component, a sealing groove opened on the top of the precast component, a cover plate installed on the top of the precast component, an inspection port opened on the top of the cover plate, an expansion sealing strip installed on the bottom of the cover plate, a wire groove opened on the side wall of the precast component, a filter plate installed on the bottom of the precast component, a drainage groove opened on the bottom of the filter plate, a fixing frame installed on the inner side wall of the precast component, a fixing rod penetrating the interior of the fixing frame, and a support sleeve installed on the inner wall of the fixing frame.

[0006] Preferably, the lifting lugs are arranged in a rectangular array centered on the central axis of the precast component, and the cover plate is tightly fitted to the top of the precast component.

[0007] Preferably, the expansion sealing strip is engaged with the sealing groove, and the guide groove is symmetrically arranged with the central axis of the prefabricated component as the center.

[0008] Preferably, the fixing rod passes through the interior of the fixing frame and is threadedly connected to the prefabricated part, and the fixing frame is welded to the support sleeve.

[0009] Preferably, the support sleeve is horizontally aligned with the wire groove, and the inner diameter of the support sleeve matches the inner diameter of the wire groove.

[0010] Compared with the prior art, the beneficial effects of this utility model are: This utility model utilizes prefabricated components, lifting lugs, sealing grooves, cover plates, inspection ports, expansion waterstop strips, wire grooves, filter plates, and drainage grooves. The sealing groove is pre-cast on the top edge of the prefabricated component, with a U-shaped cross-section and a width slightly larger than the diameter of the expansion waterstop strip. Simultaneously, the sealing groove is continuously closed around the top of the prefabricated component without any breaks or gaps, structurally eliminating the risk of short-circuit water leakage. When a small amount of groundwater seeps in along the joint, the expansion waterstop strip expands rapidly, filling all tiny gaps and even generating slight expansion pressure, further compacting the joint between the cover plate and the prefabricated component to ensure overall sealing. Combined with the use of the filter plate and drainage groove, it can quickly drain water accumulated at the bottom of the prefabricated component, preventing prolonged immersion of cables and minimizing their lifespan.

[0011] This utility model uses a fixed frame, a fixed rod, and a support sleeve. The fixed rod is threaded through the inside of the fixed rod and connected to the inner wall of the prefabricated component. Then, the cable is threaded through the inside of the support sleeve. The support sleeve supports the middle section of the cable and prevents the middle section of the cable from sag due to gravity after long-term use. This would prevent the cable from rubbing against the ground or other structures, causing damage to the insulation layer, and resulting in leakage or short circuit. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of the present utility model from the front view; Figure 2 This is a side view of the structure of this utility model; Figure 3 This is a schematic diagram showing the internal cross-section of the prefabricated component of this utility model; Figure 4 This is a structural schematic diagram showing the components surrounding the fixing frame of this utility model disassembled.

[0013] In the diagram: 1. Precast component; 2. Lifting lug; 3. Sealing groove; 4. Cover plate; 5. Inspection port; 6. Expansion waterstop strip; 7. Wire groove; 8. Filter plate; 9. Drainage groove; 10. Fixing frame; 11. Fixing rod; 12. Support sleeve. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0015] The embodiments of this utility model will be described below based on its overall structure.

[0016] Please see Figures 1-4 A precast concrete cable well includes a precast component 1. Lifting lugs 2 are installed on the outer wall of the precast component 1. A sealing groove 3 is formed on the top of the precast component 1. A cover plate 4 is installed on the top of the precast component 1. An inspection port 5 is formed on the top of the cover plate 4. An expansion waterstop strip 6 is installed on the bottom of the cover plate 4. A wire channel 7 is formed on the side wall of the precast component 1. A filter plate 8 is installed on the bottom of the precast component 1. A drainage channel 9 is formed on the bottom of the filter plate 8. The lifting lugs 2 are arranged in a rectangular array centered on the central axis of the precast component 1. The cover plate 4 is tightly fitted to the top of the precast component 1. The expansion waterstop strip 6 is engaged with the sealing groove 3. The wire channel 7 is symmetrically arranged centered on the central axis of the precast component 1. The sealing groove 3 is pre-cast at the top edge of the precast component 1, and its cross-section is U-shaped. The sealing groove 3 is slightly wider than the diameter of the expansion sealing strip 6. At the same time, the sealing groove 3 is continuously closed around the top of the precast part 1 without any breaks or gaps, thus eliminating the risk of short-circuit water seepage from a structural point of view. When a small amount of groundwater seeps in along the joint, the expansion sealing strip 6 will expand rapidly, filling all the tiny gaps and even generating slight expansion pressure to further compact the joint between the cover plate 4 and the precast part 1, ensuring overall sealing. In conjunction with the use of the filter plate 8 and the drainage groove 9, the water accumulated at the bottom of the precast part 1 can be quickly drained, avoiding prolonged immersion of the cable and affecting its service life.

[0017] Please see Figures 1-4A precast concrete cable well is provided. A fixing frame 10 is installed on the inner wall of the precast component 1. A fixing rod 11 passes through the interior of the fixing frame 10. A support sleeve 12 is installed on the inner wall of the fixing frame 10. The fixing rod 11 passes through the interior of the fixing frame 10 and is threadedly connected to the precast component 1. The fixing frame 10 and the support sleeve 12 are welded together. The support sleeve 12 is horizontally aligned with the wire groove 7. The inner diameter of the support sleeve 12 matches the inner diameter of the wire groove 7. Through the fixing frame 10, fixing rod 11 and support sleeve 12, the fixing rod 11 passes through the interior of the fixing frame 11 and is threadedly connected to the inner wall of the precast component 1. Then the cable passes through the support sleeve 12. The support sleeve 12 supports the middle section of the cable and avoids the "sag" phenomenon caused by gravity due to long-term use of the middle section of the cable, which would cause the cable to rub against the ground or other structures, causing damage to the insulation layer and resulting in leakage and short circuit.

[0018] Working principle: In use, firstly, the fixing rod 11 is threaded through its interior and connected to the inner wall of the precast component 1. Then, the cable is threaded through the support sleeve 12. The support sleeve 12 supports the middle section of the cable, preventing the cable from sag due to gravity over a long period of use. This prevents the cable from rubbing against the ground or other structures, causing damage to the insulation layer, and leading to leakage or short circuit. Then, the cable is threaded through the conductor groove 7 and connected to the outside. Finally, the cover plate 4 is tightly fitted to the top of the precast component 1. At this point, the expansion sealing strip 6 engages with the sealing groove 3. The sealing groove 3 is pre-cast at the top edge of the precast component 1, and its cross-section is U-shaped. The sealing groove 3 is slightly wider than the diameter of the expansion sealing strip 6. It is continuously closed around the top of the precast component 1 without any breaks or gaps, structurally eliminating the risk of short-circuit leakage. When a small amount of groundwater seeps in along the joint, the expansion sealing strip 6 expands rapidly, filling all tiny gaps and even generating slight expansion pressure to further compact the joint between the cover plate 4 and the precast component 1, ensuring overall sealing. Combined with the use of the filter plate 8 and drainage groove 9, it can quickly drain water accumulated at the bottom of the precast component 1, preventing prolonged immersion of cables and affecting their lifespan. Finally, the precast component 1 is backfilled and pre-embedded, thus completing the device's operation. Content not described in detail in this specification belongs to existing technology known to those skilled in the art.

[0019] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A precast concrete cable well, comprising precast components (1), characterized in that: The precast component (1) has a lifting lug (2) installed on its outer wall. A sealing groove (3) is provided on the top of the precast component (1). A cover plate (4) is installed on the top of the precast component (1). An inspection port (5) is provided on the top of the cover plate (4). An expansion water-stop strip (6) is installed on the bottom of the cover plate (4). A wire groove (7) is provided on the side wall of the precast component (1). A filter plate (8) is installed on the bottom of the precast component (1). A drainage groove (9) is provided on the bottom of the filter plate (8). A fixing frame (10) is installed on the inner side wall of the precast component (1). A fixing rod (11) passes through the interior of the fixing frame (10). A support sleeve (12) is installed on the inner wall of the fixing frame (10).

2. A precast concrete cable well according to claim 1, characterized in that: The lugs (2) are arranged in a rectangular array with the central axis of the precast component (1) as the center, and the cover plate (4) is tightly attached to the top of the precast component (1).

3. A precast concrete cable well according to claim 1, characterized in that: The expansion sealing strip (6) is engaged with the sealing groove (3), and the wire groove (7) is symmetrically arranged with the central axis of the prefabricated part (1) as the center.

4. A precast concrete cable well according to claim 1, characterized in that: The fixing rod (11) passes through the interior of the fixing frame (10) and is threadedly connected to the prefabricated part (1), and the fixing frame (10) is welded to the support sleeve (12).

5. A precast concrete cable well according to claim 1, characterized in that: The support sleeve (12) is horizontally aligned with the wire groove (7), and the inner wall diameter of the support sleeve (12) matches the inner wall diameter of the wire groove (7).

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