Prefabricated assembly type power ring main unit foundation

Abstract

The application discloses a prefabricated assembly type power ring network cabinet foundation, which comprises a prefabricated concrete base and a ring network cabinet body, a butt joint groove is formed in the middle of the interior of the prefabricated concrete base for placing the ring network cabinet body, upper angle steel grooves are formed at the four corners of the butt joint groove, the upper angle steel grooves are used for passing through lifting type thickened angle steels, the prefabricated concrete base is placed on a horizontal ground, lower angle steel grooves corresponding to the upper angle steel grooves are excavated on the horizontal ground, and the lower angle steel grooves are used for extending into the lifting type thickened angle steels. The prefabricated assembly type power ring network cabinet foundation has the lifting type thickened angle steels, has double functions, the lifting type thickened angle steels have inclined guide sections, the inclined guide sections have a certain range, so that the difficulty of hoisting and placing is reduced, the jacks at the lower ends of the inclined guide sections play the role of supporting the upper ring network cabinet body, and the application of the prefabricated assembly type power ring network cabinet foundation to different working conditions brings better use prospect.

Description

Technical Field

[0001] This invention relates to the field of ring main unit structural design, and in particular to a prefabricated assembled power ring main unit foundation. Background Technology

[0002] In industrial clusters and urban centers, where power load density is high, power supply safety and stability are of paramount importance. Establishing a distribution network based on ring main units can effectively improve power supply reliability, ensure power supply continuity, and minimize the impact of power equipment failures and maintenance outages. Outdoor ring main units are increasingly used in power grid construction due to their advantages such as compact structure, small footprint, aesthetic appearance, and ability to blend in with the surrounding environment.

[0003] Existing outdoor ring main units all require on-site installation. Traditional on-site construction methods, such as processing steel bars and pouring concrete, inevitably impact the surrounding atmosphere and water resources. Nighttime construction also causes noise pollution to nearby residents. On-site casting is subject to many uncertainties due to natural environment and weather conditions, involves complicated construction procedures, consumes a lot of manpower, has a long construction time, tight schedule, and high cost. Therefore, prefabricated assembled ring main units have emerged, such as the "A New Type of Prefabricated Assembled Power Ring Main Unit Foundation" published by patent number CN214994022U. However, such prefabricated ring main units have certain technical defects and are not convenient for practical application.

[0004] The first ring main unit faces challenges during hoisting. Because the mounting slots of the prefabricated base and the cabinet are nearly identical in size, a perfect fit is required. Directly hoisting and placing it into the slot during assembly is difficult, increasing the risk of collisions after multiple attempts and potentially damaging both the cabinet and the prefabricated base. Secondly, the prefabricated base is connected to the ground via bolts and other small fasteners. Over time, as the fasteners corrode, the connection becomes unstable, resulting in a weak connection between the ground, the prefabricated base, and the cabinet, and cumbersome connection procedures. Therefore, we propose a prefabricated assembled power ring main unit foundation. Summary of the Invention

[0005] The main objective of this invention is to provide a prefabricated assembled power ring network cabinet foundation, which can effectively solve the technical problems of high hoisting difficulty and unstable connection of prefabricated bases in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A prefabricated assembled power ring main unit foundation includes a prefabricated concrete base and a ring main unit body. A docking groove is provided in the middle of the interior of the prefabricated concrete base for the ring main unit body to be inserted. Upper angle steel grooves are provided on the outer sides of the four corners of the docking groove for lifting thickened angle steel to pass through. The prefabricated concrete base is placed on a horizontal ground. Lower angle steel grooves corresponding to the upper angle steel grooves are excavated on the horizontal ground for lifting thickened angle steel to extend into.

[0008] Preferably, the lifting thickened angle steel includes a vertical section and an inclined guide section. The upper ends of the inclined guide section and the vertical section are fixedly connected. A bolt fixing hole is opened on the side of the upper end of the vertical section. Preferably, there are 2-6 sets of bolt fixing holes. The bolt fixing holes allow bolts to pass through. The other end of the bolt is installed on the shell of the ring main unit, which serves to connect the two.

[0009] Preferably, a second concrete filling groove is provided at the center of the upper end face of the vertical section. The second concrete filling groove extends downward to the bottom of the vertical section. Several sets of concrete overflow holes are evenly provided on the inner and outer surfaces of the vertical section near the lower end. The concrete overflow holes are connected to the second concrete filling groove. The second concrete filling groove gradually changes from a circular cross-section to a larger rectangle from top to bottom. The position of the rectangular part corresponds to the position of the concrete overflow hole, which is used to expand the pouring area. A first concrete filling groove is provided at the center of the inclined upper end face of the inclined guide section. The upper ends of the first concrete filling groove and the second concrete filling groove are connected.

[0010] Preferably, a welding joint is provided at the middle position of the lower end face of the inclined guide section, and a connecting block is welded at the welding joint. The upper end face of the connecting block has the same inclination angle as the inclined guide section to achieve complete welding. The lower end face of the connecting block is a horizontal plane and has an inner rotating groove in the middle. The inner rotating groove has two sets of notches symmetrically provided. The inner rotating groove allows the top rod to extend into it, and the two abut against each other to achieve a supporting function. Two sets of locking posts are symmetrically provided on both sides of the upper end of the top rod for extending into the notches. The top rod is installed on a jack, and the jack is located in a jack placement groove opened at the corner of the precast concrete base. By rotating the jack, the top rod is driven to rotate in the inner rotating groove, thereby limiting the top rod or disengaging it from the inner rotating groove at the two sets of notches.

[0011] Preferably, an upper inspection port is provided through the middle of the docking groove, and a lower inspection port adapted to the upper inspection port is excavated on the horizontal ground. Cable bundles pass through both the upper and lower inspection ports and can be accessed by maintenance personnel.

[0012] Preferably, an insertable connecting sleeve is fixedly installed through the stainless steel base plate at the bottom of the ring main unit. An outer cylinder is fixedly installed on the outside of the insertable connecting sleeve. Several sets of liquid collection tanks are evenly formed between the inner wall of the outer cylinder and the outer wall of the insertable connecting sleeve. The number of liquid collection tanks is preferably 6-12 sets. Several sets of drain holes are evenly opened at the bottom of the outer cylinder. The number of drain holes is preferably 6-24 sets. The drain holes are connected to the liquid collection tanks.

[0013] Preferably, the insertable connecting sleeve drives the upper end to move and install the top cover. The top cover is located inside the main body of the ring main unit. The top cover covers the upper surface of the insertable connecting sleeve and the outer cylinder. A first cable hole for the cable bundle to pass through is opened in the middle of the top cover. A waterproof sealing ring is provided on the inner wall of the first cable hole. The upper surface of the top cover is an arched surface, which is high in the middle and low at the edges, so that water flow can be introduced into the gap at the edge of the top cover and enter the liquid collection tank from the gap.

[0014] Preferably, the upper inspection port includes a support part and a docking part. The support part is for the outer cylinder to extend into to form a splicing support. The upper end of the docking part is provided with an annular step. Several sets of oblique flow openings are evenly opened around the annular step. Each set of oblique flow openings and drainage holes are connected to each other. Preferably, the two are corresponding in number. The oblique flow openings extend obliquely to the outside of the precast concrete base and form the main drainage channel.

[0015] Preferably, an installation sleeve is fixedly provided around the inner wall of the docking part, and an annular inflatable airbag is provided around the inner side of the installation sleeve. A connector is installed on the upper surface of the annular inflatable airbag, and an air pipe is connected upward to the connector. The air pipe extends upward and is connected to a suction device, which is installed inside the ring main unit. When fully inflated, the annular inflatable airbag expands to form a second cable hole, through which the cable bundle passes and enters the lower inspection port. When inflated, the upper end face of the annular inflatable airbag is arched, and the lower end face is concave. Wall grooves are evenly provided on the inner wall of the docking part along the edge of the arched surface. The wall grooves extend obliquely outward to the outside of the precast concrete base and form branch drainage channels. The ends of the branch drainage channels flow into the main drainage channel. The lower exposed part of the insertable connecting sleeve extends into the docking part and is pressed against the annular inflatable airbag.

[0016] Preferably, a drainage tank top is welded to the upper end of the main body of the ring main unit, and two sets of lifting rings are symmetrically installed on the upper surface of the drainage tank top. The lifting rings serve to connect to the hoisting equipment and are connected to the hook and chain of the hoisting equipment.

[0017] Preferably, the specific installation steps include S1 factory prefabrication: the precast concrete base and the main body of the ring main unit are prefabricated in the factory, and the two are prefabricated according to the above structure and are matched in size;

[0018] S2 Ground Pretreatment: Select the location where the installation is to be carried out. The terrain should be flat. Excavate the required four sets of lower angle steel channels and lower inspection ports on the level ground. If necessary, the surface should be smoothed with concrete.

[0019] S3 Precast Concrete Base Calibration and Placement: First, transport the precast concrete base to the site by means of transportation and place it on a level ground. Align the corresponding upper and lower angle steel channels and use the jacks of four sets of jacks to lift the lifting thickened angle steel to the maximum height.

[0020] S4 Ring Main Unit Lifting: Use lifting chains to connect lifting rings and use the lifting hooks of the lifting equipment to lift the main body of the ring main unit. When lifting and placing the main body of the ring main unit, first make the two sets of bottom corners of the main body of the ring main unit contact the inclined guide section of the lifting thickened angle steel. Since the inclined guide section has a certain range, it reduces the difficulty of lifting and placing. Let the two sets of bottom corners of the main body of the ring main unit smoothly enter the vertical section of the lifting thickened angle steel. The bottom corners and the steel groove of the vertical section fit together. At this time, the other two sets of bottom corners of the main body of the ring main unit also enter the vertical section because of the size fit. The main body of the ring main unit is completely inserted into the docking groove and placed straight down steadily.

[0021] S5 Angle Steel Bottom Reduction: The top rods of the four sets of jacks drive the lifting thickened angle steel to descend, allowing it to enter the lower angle steel groove until it reaches the bottom.

[0022] S6 Jack Removal: Rotate the jack to make the jack rod rotate in the inner rotating slot, so that the jack rod's locking pins are directly above the notch. Then continue to lower the jack rod to disengage it from the notch, allowing the jack to separate from the lifting thickened angle steel. Then remove the jack from the jack placement slot.

[0023] S7 Grouting Machine Grouting: The grouting pipe of the grouting machine is inserted into the first concrete filling tank and then extended into the second concrete filling tank. At this time, the grouting machine is started to continuously inject concrete into the second concrete filling tank. As the amount of concrete increases, it overflows from several sets of concrete overflow holes and enters the gap between the lifting thickened angle steel and the lower angle steel channel, filling the gap between the two. After the concrete dries, a firm connection is formed, which achieves the function of fixing the concrete base.

[0024] S8 bolts are used for fixing; the bolts on the four sides are passed through the bolt fixing holes and connected to the shell of the ring main unit to complete the installation.

[0025] This invention provides a prefabricated assembled power ring main unit foundation, which has the following significant improvements and advantages compared with the prior art:

[0026] (1) The design of the lifting thickened angle steel has a dual function. On the one hand, the lifting thickened angle steel has an inclined guide section. Since the inclined guide section has a certain range, it reduces the difficulty of hoisting and placement. The jack at the lower end of the inclined guide section plays the role of supporting the upper ring network cabinet body, preventing crushing and structural breakage. Since the inclined guide section is set at an angle downward, the ring network cabinet body slides downward under the constraint of the hoisting tool, allowing the two bottom corners of the ring network cabinet body to smoothly enter the vertical section of the lifting thickened angle steel. The bottom corners and the steel groove of the vertical section fit together, which is convenient for precise assembly and installation.

[0027] (2) On the other hand, the lifting thickened angle steel descends in a straight line into the steel trough on the ground under the action of the jack. The grouting machine is started to continuously inject concrete into the second concrete injection trough. As the amount of concrete increases, it overflows from several sets of concrete overflow holes and enters the gap between the lifting thickened angle steel and the lower angle steel trough, filling the gap between the two. After the concrete dries, a firm connection is formed, which achieves the function of fixing the concrete base. This fixing method is firm, has a long service life, and is simple and direct to operate.

[0028] (3) The design of the annular inflatable airbag is as follows: First, when the airbag is fully inflated, it will wrap the cable bundle and play a sealing role, preventing the exchange of water vapor between the upper and lower parts of the inspection port; Second, during installation, the outer cylinder and the insert-type connecting sleeve enter the support part and the docking part respectively. When the annular inflatable airbag of the docking part contacts the bottom of the insert-type connecting sleeve, it plays a buffer role, achieving a shock absorption effect and helping the cabinet to be placed stably; Third, the air pump is used to export the gas in the annular inflatable airbag, making it deflate and adhere to the surface of the mounting sleeve, so as not to interfere with the downward movement of maintenance personnel; Therefore, the airbag structure has multiple functions. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of a prefabricated assembled power ring main unit foundation according to the present invention;

[0030] Figure 2 This is a detailed structural diagram of the precast concrete base of the present invention;

[0031] Figure 3 This is a plan view of the horizontal ground of the present invention;

[0032] Figure 4 This is a disassembled structural diagram of the lifting-type thickened angle steel of the present invention;

[0033] Figure 5 This is a connection view of the inclined guide section and the top rod of the present invention;

[0034] Figure 6 This is a bottom structural diagram of the main body of the ring main unit of the present invention;

[0035] Figure 7 This is a diagram showing the connection structure between the upper and lower parts of the insert-type connecting sleeve of the present invention;

[0036] Figure 8 This is an internal cross-sectional view of the inspection port of the present invention;

[0037] Figure 9 This is a schematic diagram of the installation steps of the present invention.

[0038] In the diagram: 1. Precast concrete base; 2. Connecting groove; 3. Ring main unit body; 4. Lifting thickened angle steel; 5. Upper angle steel channel; 6. Horizontal ground; 7. Lower angle steel channel; 8. Drainage tank top; 9. Lifting ring; 10. Vertical section; 11. Inclined guide section; 12. First concrete filling tank; 13. Weld joint; 14. Bolt fixing hole; 15. Concrete overflow hole; 16. Second concrete filling tank; 17. Connecting block; 18. Inner rotating groove; 19. Notch; 20. Top rod; 21. Column clamp; 22. Jack; 23. 24. Jack placement slot; 25. Upper inspection port; 26. Lower inspection port; 27. Stainless steel base plate; 28. Insert-type connecting sleeve; 29. ​​Outer cylinder; 20. Liquid collection tank; 31. Drain hole; 32. Top cover; 33. First cable hole; 34. Waterproof sealing ring; 35. Arched surface; 36. Support part; 37. Connecting part; 38. Inclined flow opening; 39. Main drain channel; 40. Mounting sleeve; 41. Annular inflatable airbag; 42. Connector; 43. Second cable hole; 44. Annular step; 45. Wall groove gap; 46. Branch drain channel. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1:

[0041] like Figure 1-5 As shown, this embodiment provides a prefabricated assembled power ring main unit foundation, including a prefabricated concrete base 1 and a ring main unit body 3. A docking groove 2 is provided in the middle of the interior of the prefabricated concrete base 1 for the ring main unit body 3 to be inserted. Upper angle steel grooves 5 are provided on the outer sides of the four corners of the docking groove 2. The upper angle steel grooves 5 are for the lifting thickened angle steel 4 to pass through. The prefabricated concrete base 1 is placed on a horizontal ground 6. A lower angle steel groove 7 corresponding to the upper angle steel grooves 5 is excavated on the horizontal ground 6. The lower angle steel groove 7 is for the lifting thickened angle steel 4 to extend into.

[0042] Specifically, the lifting-type thickened angle steel 4 includes a vertical section 10 and an inclined guide section 11.

[0043] In this embodiment, the upper ends of the inclined guide section 11 and the vertical section 10 are fixedly connected. A bolt fixing hole 14 is provided on the side of the upper end of the vertical section 10. The bolt fixing hole 14 allows the bolt to pass through, and the other end of the bolt is installed on the shell of the ring main unit 3, which serves to connect the two.

[0044] In this embodiment, a second concrete filling groove 16 is provided at the center of the upper end face of the vertical section 10, and the second concrete filling groove 16 extends downward to the bottom of the vertical section 10.

[0045] Furthermore, several sets of concrete overflow holes 15 are evenly provided on the inner and outer surfaces of the vertical section 10 and near the lower end. The concrete overflow holes 15 are connected to the second concrete filling groove 16. The second concrete filling groove 16 gradually changes from a circular cross-section to a larger rectangle from top to bottom. The position of the rectangular part corresponds to the position of the concrete overflow hole 15, which is used to expand the pouring area.

[0046] In this embodiment, a first concrete filling groove 12 is provided at the center of the upper inclined end face of the inclined guide section 11, and the upper ends of the first concrete filling groove 12 and the second concrete filling groove 16 are connected.

[0047] Furthermore, a welding port 13 is provided at the middle position of the lower end face of the inclined guide section 11, and a connecting block 17 is welded at the welding port 13. The upper end face of the connecting block 17 has the same inclination angle as the inclined guide section 11, so as to achieve the effect of complete welding.

[0048] Furthermore, the lower end face of the connecting block 17 is a horizontal plane, and an inner rotating groove 18 is provided in the middle. The inner rotating groove 18 has two sets of notches 19 symmetrically provided. The inner rotating groove 18 allows the top rod 20 to extend into it, and the two abut against each other to achieve a supporting function.

[0049] In this embodiment, two sets of locking pins 21 are symmetrically arranged on both sides of the upper end of the top rod 20 for extending into the notch 19 and are adapted to the shape and size of the notch 19.

[0050] In this embodiment, the top rod 20 is installed on the jack 22. The jack 22 is located in the jack placement groove 23 opened at the corner of the precast concrete base 1. The jack placement groove 23 has a limiting function, a smooth bottom surface with low resistance, and allows the jack 22 to rotate within it.

[0051] Specifically, by rotating the jack 22, the push rod 20 is driven to rotate in the inner rotating groove 18, thereby limiting the push rod or disengaging it from the inner rotating groove 18 at the two sets of notches 19.

[0052] In this embodiment, a drainage tank top 8 is welded to the upper end of the main body 3 of the ring main unit. Two sets of lifting rings 9 are symmetrically installed on the upper end of the drainage tank top 8. The lifting rings 9 serve to connect the lifting equipment and are connected to the hook and chain of the lifting equipment.

[0053] In this embodiment, an upper inspection port 24 is provided through the middle of the docking groove 2, and a lower inspection port 25 adapted to the upper inspection port 24 is excavated on the horizontal ground 6. Cable bundles pass through both the upper inspection port 24 and the lower inspection port 25, and maintenance personnel can enter them.

[0054] In this implementation, the precast concrete base 1 is first transported to the site and placed on a level ground 6, aligning the corresponding upper and lower angle steel channels 5 and 7. The lifting thickened angle steel 4 is then raised to its maximum height using the jacks 20 of the four sets of jacks 22. The lifting chain connects to the lifting rings 9, and the main body 3 of the ring main unit is lifted using the hook of the hoisting equipment. When hoisting and placing the main body 3, the two bottom corners of the main body 3 are first brought into contact with the inclined guide section 11 of the lifting thickened angle steel 4. Because the inclined guide section 11 has a certain range, the difficulty of hoisting and placing is reduced. The jacks 2 at the lower end of the inclined guide section 11... 2. This section supports the upper ring main unit 3, preventing damage and structural breakage. Because the inclined guide section 11 is angled downwards, the ring main unit 3 slides downwards under the constraint of the lifting device, allowing the two bottom corners of the ring main unit 3 to smoothly enter the vertical section 10 of the lifting thickened angle steel 4. The bottom corners and the steel groove of the vertical section 10 fit together. At this time, the other two bottom corners of the ring main unit 3 also enter the vertical section 10 due to their size matching. The ring main unit 3 is then fully inserted into the docking groove 2 and placed vertically downwards. Then, the top rods 20 of the four sets of jacks 22 drive the lifting thickened angle steel 4 downwards, allowing it to enter the lower angle steel groove. 7. Continue lowering the jack 20 until it reaches the bottom. At this point, the upper end of the lifting thickened angle steel 4 still extends a distance beyond the top surface of the precast concrete base 1. Then, rotate the jack 22, causing the jack rod 20 to rotate within the inner rotating slot 18, so that the locking posts 21 of the jack rod 20 are positioned directly above the notch 19. Then, continue lowering the jack rod 20 to disengage it from the notch 19, allowing the jack 22 and the lifting thickened angle steel 4 to separate. Remove the jack 22 from the jack placement slot 23. Finally, extend the grouting pipe of the grouting machine into the first concrete filling slot 12, and then further extend it into the second concrete filling slot 16. Since the first concrete filling tank 12 and the second concrete filling tank 16 are not on the same plane, this can prevent the grouting pipe from coming off due to vibration or causing concrete slurry to overflow during grouting. At this time, the grouting machine is started to continuously inject concrete into the second concrete filling tank 16. As the amount of concrete increases, it overflows from several sets of concrete overflow holes 15 and enters the gap between the lifting thickened angle steel 4 and the lower angle steel channel 7, filling the gap between them. After the concrete dries, a firm connection is formed, which achieves the function of fixing the concrete base 1. Finally, the bolts are passed through the bolt fixing holes 14 and connected to the shell of the ring main unit 3.

[0055] Example 2: Based on Example 1, the upper inspection port 24 is structurally redesigned to solve the problem of moisture easily seeping upwards into the cabinet from the upper inspection port 24 and lower inspection port 25 (further causing flashover and corrosion of metal components in the outdoor ring main unit). Furthermore, it addresses the technical problem of moisture and condensation inside the cabinet easily seeping downwards into the inspection ports and failing to drain properly. Figure 6-8 As shown.

[0056] Specifically, an insertable connecting sleeve 27 is fixedly installed through the stainless steel base plate 26 at the bottom of the ring main unit 3. An outer cylinder 28 is fixedly installed on the outside of the insertable connecting sleeve 27. The upper end faces of the outer cylinder 28 and the insertable connecting sleeve 27 are flush. The outer wall of the outer cylinder 28 is welded to the inner groove of the stainless steel base plate 26 and sealed. Several sets of liquid collection tanks 29 are evenly formed between the inner wall of the outer cylinder 28 and the outer wall of the insertable connecting sleeve 27. Several sets of drain holes 30 are evenly opened at the bottom of the outer cylinder 28. The drain holes 30 are connected to the liquid collection tanks 29.

[0057] In this embodiment, the insertable connecting sleeve 27 drives the upper end to move and install the upper cover 31. The upper cover 31 is located inside the ring main body 3 and covers the upper surface of the insertable connecting sleeve 27 and the outer cylinder 28.

[0058] Furthermore, a first cable hole 32 for the cable bundle to pass through is provided in the middle of the upper cover 31. A waterproof sealing ring 33 is provided on the inner wall of the first cable hole 32 to achieve a waterproof sealing effect. The upper surface of the upper cover 31 is an arched surface 34, which is high in the middle and low at the edges, so that water can be introduced into the gaps at the edges of the upper cover 31 and enter the liquid collection tank 29 from the gaps.

[0059] Specifically, the upper inspection port 24 includes a support part 35 and a docking part 36.

[0060] In this embodiment, the support part 35 allows the outer cylinder 28 to extend into it, forming a splicing support.

[0061] In this embodiment, an annular step 43 is provided at the upper end of the docking part 36. Several sets of oblique flow openings 37 are evenly opened around the annular step 43. Each set of oblique flow openings 37 is connected to the drain hole 30. The oblique flow openings 37 extend obliquely to the outside of the precast concrete base 1 and form the main drain channel 38.

[0062] Furthermore, an installation sleeve 39 is fixedly installed around the inner wall of the docking part 36, and an annular inflatable airbag 40 is installed around the inner side of the installation sleeve 39. The connection between the inner sides of both sides is sealed with adhesive.

[0063] Specifically, a connector 41 is installed on the upper surface of the annular inflatable airbag 40. The connector 41 is connected to an air pipe that extends upward and is connected to a suction device. The suction device is installed inside the main body 3 of the ring network cabinet.

[0064] In this embodiment, the annular inflatable airbag 40 expands to form a second cable hole 42 when fully inflated, allowing the cable bundle to pass through and enter the lower inspection port 25.

[0065] In this embodiment, the upper end face of the annular inflatable airbag 40 is arched when inflated, and the lower end face is concave.

[0066] Furthermore, wall grooves 44 are evenly provided on the inner wall of the docking part 36 and on the edge of the arched surface. The wall grooves 44 extend obliquely to the outside of the precast concrete base 1 and form branch drainage channels 45. The end of the branch drainage channels 45 merges into the main drainage channel 38. The outlet of the main drainage channel 38 is located on the outer surface of the precast concrete base 1.

[0067] In this embodiment, the lower exposed portion of the insertion-type connecting sleeve 27 is inserted into the docking part 36 and pressed against the annular inflatable airbag 40.

[0068] In this embodiment, under normal use, the annular inflatable airbag 40 is fully inflated, wrapping the cable bundle and providing a seal to prevent moisture exchange between the upper inspection port 24 and the surrounding area. When moisture or condensation inside the ring main unit 3 falls onto the upper cover 31, the water is guided into the gaps along the edge of the upper cover 31 due to the higher center and lower edges. The water then enters the collection tank 29 through the gaps and slowly drips down through the drain hole 30, directly into the oblique flow opening 37. Because the oblique flow opening 37 slopes outwards and downwards, it does not flow into the docking part 36. The water from the oblique flow opening 37 enters the main drain channel 38 of the precast concrete base 1 and is discharged outwards. Since the annular inflatable airbag 40 also has a higher center and lower edges after expansion... The water level is low, so even if water droplets fall on its surface, they will be guided to the edge and enter the wall groove gap 44. Then, they will flow from the end of the branch drain channel 45 into the main drain channel 38 and be discharged to the outside, achieving a double waterproof and drainage effect. During installation, the outer cylinder 28 and the insert-type connecting sleeve 27 are respectively inserted into the support part 35 and the docking part 36. The annular inflatable airbag 40 of the docking part 36 (pre-inflated and set to an inflated state) plays a buffering role when it contacts the bottom of the insert-type connecting sleeve 27, achieving a shock absorption effect and helping the cabinet to be placed stably. When it is necessary to inspect the bottom cable, first open the top cover 31, and then use the suction pump in the suction device to export the gas in the annular inflatable airbag 40, so that it dries out and adheres to the surface of the mounting sleeve 39, so as not to interfere with the downward movement of the maintenance personnel.

[0069] Example 3:

[0070] By combining the implementation of steps one and two, a set of installation methods for ring main units has been formed, such as... Figure 9 As shown, it features simple assembly, time-saving, and strong connection, and specifically includes the following steps:

[0071] S1 Factory Prefabrication: The precast concrete base 1 and the main body of the ring main unit 3 are prefabricated in the factory. The two are prefabricated according to the above structure and are matched in size.

[0072] S2 Ground Pretreatment: Select the location where the installation is to be carried out. The terrain should be flat. Excavate the required four sets of lower angle steel channels 7 and lower inspection ports 25 on the horizontal ground 6. If necessary, the surface should be smoothed with concrete.

[0073] S3 Precast Concrete Base Calibration and Placement: First, transport the precast concrete base 1 to the site by means of transportation and place it on the horizontal ground 6. Align the corresponding upper angle steel channel 5 and lower angle steel channel 7. Use the jack rods 20 of the four sets of jacks 22 to lift the lifting thickened angle steel 4 to the maximum height.

[0074] S4 Ring Main Unit Lifting: Use the lifting chain to connect the lifting ring 9, and use the lifting hook of the lifting equipment to lift the main body 3 of the ring main unit. When lifting and placing the main body 3 of the ring main unit, first make the two sets of bottom corners of the main body 3 of the ring main unit contact the inclined guide section 11 of the lifting thickened angle steel 4. Since the inclined guide section 11 has a certain range, it reduces the difficulty of lifting and placing. Let the two sets of bottom corners of the main body 3 of the ring main unit smoothly enter the vertical section 10 of the lifting thickened angle steel 4. The bottom corners and the steel groove of the vertical section 10 fit together. At this time, the other two sets of bottom corners of the main body 3 of the ring main unit also enter the vertical section 10 because of the size fit. The main body 3 of the ring main unit is completely inserted into the docking groove 2, and then it can be placed straight down and stabilized.

[0075] S5 Angle Steel Bottom Reduction: The top rods 20 of the four sets of jacks 22 drive the lifting thickened angle steel 4 to descend, allowing it to enter the lower angle steel groove 7 until it reaches the bottom.

[0076] S6 Jack Removal: Rotate jack 22 to drive the top rod 20 to rotate in the inner rotating groove 18, so that the locking pins 21 of the top rod 20 are directly above the notch 19. Then continue to lower the height of the top rod 20 so that it is dislodged from the notch 19, allowing jack 22 to separate from the lifting thickened angle steel 4, and then remove jack 22 from the jack placement groove 23.

[0077] S7 Grouting Machine Grouting: The grouting pipe of the grouting machine is inserted into the first concrete filling tank 12 and then extended into the second concrete filling tank 16. At this time, the grouting machine is started to continuously inject concrete into the second concrete filling tank 16. As the amount of concrete increases, it overflows from several sets of concrete overflow holes 15 and enters the gap between the lifting thickened angle steel 4 and the lower angle steel channel 7, filling the gap between them. After the concrete dries, a firm connection is formed, which achieves the function of fixing the concrete base 1.

[0078] S8 bolts are used for fixing; the bolts on the four sides are passed through the bolt fixing holes 14 and connected to the shell of the ring main unit 3 to complete the installation.

[0079] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0080] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A prefabricated assembled power ring main unit foundation, comprising a prefabricated concrete base (1) and a ring main unit body (3), characterized in that: The precast concrete base (1) has a connecting groove (2) in the middle of its interior for the ring main unit (3) to be placed in. The four corners of the connecting groove (2) are provided with upper angle steel grooves (5). The upper angle steel grooves (5) are for the lifting thickened angle steel (4) to pass through. The precast concrete base (1) is placed on a horizontal ground (6). The horizontal ground (6) has a lower angle steel groove (7) corresponding to the upper angle steel grooves (5). The lower angle steel grooves (7) are for the lifting thickened angle steel (4) to extend into. The lifting thickened angle steel (4) includes a vertical section (10) and an inclined guide section (11). The upper ends of the inclined guide section (11) and the vertical section (10) are fixedly connected. A bolt fixing hole (14) is opened on the side of the upper end of the vertical section (10). The bolt fixing hole (14) is for the bolt to pass through. The other end of the bolt is installed on the shell of the ring main unit (3). A second concrete filling groove (16) is provided at the center of the upper end face of the vertical section (10). The second concrete filling groove (16) extends downward to the bottom of the vertical section (10). Several sets of concrete overflow holes (15) are evenly provided on the inner and outer surfaces of the vertical section (10) and near the lower end. The concrete overflow holes (15) are connected to the second concrete filling groove (16). The second concrete filling groove (16) gradually changes from a circular cross-section to a larger rectangle from top to bottom. The position of the rectangular part corresponds to the position of the concrete overflow hole (15). A first concrete filling groove (12) is provided at the center of the inclined upper end face of the inclined guide section (11). The upper ends of the first concrete filling groove (12) and the second concrete filling groove (16) are connected. A welding port (13) is provided at the middle of the lower end face of the inclined guide section (11). A connecting block (17) is welded at the welding port (13). The lower end face of the connecting block (17) is horizontal and an inner rotating groove (18) is provided in the middle. The inner rotating groove (18) is symmetrically provided with two sets of notches (19). The inner rotating groove (18) is for the top rod (20) to extend into. Two sets of locking posts (21) are symmetrically provided on both sides of the upper end of the top rod (20) for extending into the notches (19). The top rod (20) is installed on the jack (22). The jack (22) is located in the jack placement groove (23) opened at the corner of the precast concrete base (1). By rotating the jack (22), the top rod (20) is driven to rotate in the inner rotating groove (18), thereby limiting the top rod or disengaging it from the inner rotating groove (18) at the two sets of notches (19). The middle of the docking groove (2) is provided with an upper inspection port (24), and a lower inspection port (25) adapted to the upper inspection port (24) is excavated on the horizontal ground (6). Cable bundles pass through both the upper inspection port (24) and the lower inspection port (25), and maintenance personnel can enter them. An insertable connecting sleeve (27) is fixedly installed through the stainless steel base plate (26) at the bottom of the main body (3) of the ring network cabinet. An outer cylinder (28) is fixedly installed on the outside of the insertable connecting sleeve (27). Several sets of liquid collection tanks (29) are evenly formed between the inner wall of the outer cylinder (28) and the outer wall of the insertable connecting sleeve (27). Several sets of drain holes (30) are evenly opened at the bottom of the outer cylinder (28). The drain holes (30) and the liquid collection tanks (29) are connected. The insert-type connecting sleeve (27) drives the upper end to move and install the upper cover (31). The upper cover (31) is located inside the main body (3) of the ring network cabinet. The upper cover (31) covers the upper end surface of the insert-type connecting sleeve (27) and the outer cylinder (28). The upper cover (31) has a first cable hole (32) for the cable bundle to pass through in the middle position. The upper end surface of the upper cover (31) is an arched surface (34), which is high in the middle and low at the edge, so that water flow can be introduced into the gap at the edge of the upper cover (31) and enter the liquid collection tank (29) from the gap. The upper inspection port (24) includes a support part (35) and a docking part (36). The support part (35) allows the outer cylinder (28) to extend into it to form a splicing support. The upper end of the docking part (36) is provided with an annular step (43). Several sets of oblique flow openings (37) are evenly opened around the annular step (43). Each set of oblique flow openings (37) is connected to the drain hole (30). The oblique flow openings (37) extend obliquely to the outside of the precast concrete base (1) and form the main drain channel (38). An installation sleeve (39) is fixedly provided around the inner wall of the docking part (36). An annular inflatable airbag (40) is provided around the inner side of the installation sleeve (39). A connector (41) is installed on the upper surface of the annular inflatable airbag (40). When the annular inflatable airbag (40) is fully inflated, it expands to form a second cable hole (42). When the annular inflatable airbag (40) is inflated, the upper end face is an arched surface and the lower end face is a concave surface. A wall groove (44) is evenly opened on the inner wall of the docking part (36) and located at the edge of the arched surface. The wall groove (44) extends obliquely to the outside of the precast concrete base (1) and forms a branch drain channel (45). The end of the branch drain channel (45) merges into the main drain channel (38). The lower exposed part of the docking part (36) is inserted into and pressed on the annular inflatable airbag (40).

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