Prefabricated assembly type ring main unit foundation

Abstract

The utility model discloses a prefabricated assembly type ring main unit foundation, and belongs to the technical field of prefabricated pipe galleries. Comprising a bottom plate, a foundation main body, ventilating windows, wire inlet and outlet holes, mounting channel steel and manholes, the front part of the foundation main body is upwards exposed out of the ground to form an exposed part, and the rear part is not exposed out of the ground; the mounting channel steel is arranged at the top of the exposed part; the access hole is formed in the upper side of the rear part of the foundation main body; the foundation body is formed by splicing a lower foundation, an exposed part and a top plate, the lower foundation and the exposed part are of rectangular cylindrical structures matched with each other, the exposed part and the top plate are arranged on the top of the lower foundation side by side in a front-and-back mode, the lower foundation is formed in the bottom plate, the access hole is formed in the top plate, and the wire inlet and outlet hole is formed in the lower foundation; the lower end of the lower foundation and the bottom plate, the upper end of the lower foundation and the lower end of the exposed part, and the upper end of the lower foundation and the top plate are connected through a plurality of locking structures; the locking structure comprises a bolt, a nut, a long bolt installation notch and a short nut installation notch.

Description

Technical Field

[0001] The utility model belongs to the technical field of prefabricated pipe corridors, and particularly relates to a prefabricated assembled ring network cabinet foundation. Background Art

[0002] Ring main unit is an electrical equipment for transmission and distribution (high voltage switchgear) installed in a metal or non-metallic insulating cabinet or made into an assembled interval ring main unit. Its core part adopts load switches and fuses. It has the advantages of simple structure, small size, low price, improved power supply parameters and performance, and power supply safety. Ring main units are widely used in marine engineering buildings, especially in load center distribution stations and box-type substations. In related technologies, in order to cooperate with the installation of ring main units, it is usually necessary to set up the foundation of the ring main unit in a targeted manner. The foundation of the ring main unit is a common civil engineering infrastructure in distribution network projects.

[0003] For example, the patent with application number CN202121897020.5 discloses a prefabricated assembled ring network cabinet foundation, including an upper part of a prefabricated ring network cabinet foundation and a lower part of a prefabricated ring network cabinet foundation assembled from top to bottom, the upper part of the prefabricated ring network cabinet foundation including an upper main body surrounded by an upper front side panel, an upper rear side panel, an upper left side panel and an upper right side panel, a mounting seat surrounded by a front mounting plate, a rear mounting plate, a left mounting plate and a right mounting plate is arranged above the upper main body, the front mounting plate is coplanar with the upper front side panel and has a shorter length than the upper front side panel, the rear mounting plate is coplanar with the upper rear side panel and has a shorter length than the upper rear side panel, the left mounting plate is coplanar with the upper left side panel and has the same length as the upper left side panel, the distance between the right mounting plate and the left mounting plate is shorter than the distance between the upper left side panel and the upper right side panel, and the right mounting plate is close to A manhole beam parallel to the upper right side plate is arranged on one side of the upper right side plate, and a prefabricated cover plate is arranged on the upper part of the area surrounded by the manhole beam and the upper right side plate; the lower part of the prefabricated ring network cabinet foundation includes a lower main body surrounded by a lower front side plate, a lower rear side plate, a lower left side plate and a lower right side plate, and a base is arranged below the lower main body to close the lower part of the prefabricated ring network cabinet foundation, and a grounding pile penetrating the base and inserted into the bottom surface is installed on the base; a plurality of grounding protection reserved steel plates are arranged on the top of the front mounting plate and the rear mounting plate, and the grounding protection reserved steel plates are connected to a grounding bus, and the grounding bus is connected to the grounding pile; the mounting seat and the lower main body are both provided with a plurality of embedded sleeves for lifting and demoulding, and a plurality of pipeline installation and ventilation holes are opened on the upper part of the prefabricated ring network cabinet foundation and the lower part of the prefabricated ring network cabinet foundation. The fixing method between the structures in this patent is complicated and inconvenient for processing and installation.

[0004] For example, the patent with application number CN202320555623.X discloses an assembled ring network cabinet foundation, including a base, a connecting plate and two base side plates, the top of the base is provided with an annular tongue and groove, the annular tongue and groove is formed by a protruding annular tongue and groove plate, the two base side plates are joined and spliced ​​to form a side enclosure with upper and lower openings, the bottom end of the side enclosure is connected with the annular tongue and groove mortise and tenon joints, the side enclosure and the tongue and groove plate of the base are respectively provided with a plurality of first bolt holes, the side enclosure is bolted to the tongue and groove plate, the two ends of the connecting plate and the top ends of the two base side plates are respectively provided with second bolt holes, and the two ends of the connecting plate are respectively bolted to the two base side plates. This patent is an integrated structure with a large volume and is not convenient for installation.

[0005] For example, the patent with application number CN202320516809.4 discloses a prefabricated assembled foundation for a ring network cabinet, including two foundation side panels and multiple partitions, the two foundation side panels are arranged in parallel and spaced apart; the foundation side panel is an inverted T-shaped panel including a vertical plate body and a horizontal plate body, the inner side panel of the vertical plate body is provided with multiple vertical slots, the vertical slots on the two vertical plate bodies are arranged one by one relative to form multiple slot groups, each of the partitions is inserted into each of the slot groups one by one, and at least one foundation well and at least one inspection well are separated between the two foundation side panels, and a manhole is provided on the partition between the inspection well and the adjacent foundation well; the partition and the two slot walls of the vertical slot are provided with multiple bolt assembly holes, and the partition is connected with the corresponding vertical slot bolts. This patent adopts the method of splicing multiple plates and fixing them by slots. The installation process is complicated (a large number of slot bolts are required), and the strength is not as high as the ring structure. Utility Model Content

[0006] In order to solve the above problems, the embodiment of the utility model provides a prefabricated assembled ring network cabinet foundation, which is composed of a bottom plate, a lower foundation, an exposed part and a top plate. The lower foundation and the exposed part are both rectangular cylindrical structures, and the bottom plate and the top plate are both rectangular plate structures. Each structure is simple and regular, and can be installed only by bolts and nuts, which is convenient to install. The technical solution is as follows:

[0007] The utility model embodiment provides a prefabricated assembled ring network cabinet foundation, including a bottom plate 1, a foundation body, a ventilation window 5 on the upper part of the foundation body, an inlet and outlet hole 6 at the lower part of the foundation body, a mounting channel steel 7 on the top of the foundation body, and an inspection hole 8 on the foundation body; the foundation body is arranged along the front-back direction, and is arranged on the bottom plate 1, and its front part is exposed to the ground upward to form an exposed part 3, and its rear part is not exposed to the ground and its upper side is closed; the mounting channel steel 7 is arranged at the top of the exposed part 2, and the inspection hole 8 is arranged at the rear of the foundation body. The upper side; the foundation body is composed of a lower foundation 2, an exposed portion 3 and a top plate 4, the lower foundation 2 and the exposed portion 3 are rectangular cylindrical structures that cooperate with each other, the exposed portion 3 and the top plate 4 are arranged side by side on the top of the lower foundation 2, the lower foundation 2 is arranged on the bottom plate 1, the inspection hole 8 is arranged on the top plate 4, and the inlet and outlet holes 6 are arranged on the lower foundation 2; between the lower end of the lower foundation 2 and the bottom plate 1, between the upper end of the lower foundation 2 and the lower end of the exposed portion 3, and between the upper end of the lower foundation 2 and the top The plates 4 are connected by a plurality of locking structures; the locking structures include bolts 9, nuts 10, long bolt installation notches 12 and short nut installation notches 13; the long bolt installation notches 12 are vertically arranged, and are arranged at the upper or lower part of the outer wall of the lower foundation 2, and a through hole 11 for the bolt 9 to pass through is arranged between the corresponding end of the long bolt installation notch 12 and the lower foundation 2 in the vertical direction, and the bolt 9 can be inserted into the through hole 11; the short nut installation notch 13 is arranged on the lower part of the outer wall of the exposed part 3, the bottom plate 1 or the top plate 4, and is located at the long bolt installation notch A through hole 11 for the bolt 9 to pass through is provided in the vertical direction between the through hole 11 and the upper end of the bottom plate 1, the lower end of the top plate 4 or the lower end of the exposed portion 3, and the nut 10 can be inserted into the through hole 11; when tightening, the nut 10 is located in the short nut mounting notch 13; the bolt 9 is inserted from the long bolt mounting notch 12, and its head is located at the end away from the corresponding short nut mounting notch 13, and it passes through the through hole 11 upward or downward, and its upper end or lower end reaches the short nut mounting notch 13 and is tightened by the nut 10.

[0008] Specifically, the bottom plate 1 in the embodiment of the utility model is a rectangular plate arranged along the front-to-back direction, and its left and right sides are aligned with the left and right sides of the lower foundation 2, and its front and back sides are aligned with the front and back sides of the lower foundation 2; the left and right sides of the exposed part 3 are aligned with the left and right sides of the lower foundation 2, and its front side is aligned with the front side of the lower foundation 2; the top plate 4 is a rectangular plate arranged along the front-to-back direction, and its front side rests on the rear side of the exposed part 3, and its left and right sides are aligned with the left and right sides of the lower foundation 2, and its rear side is aligned with the rear side of the lower foundation 2.

[0009] Specifically, the wire inlet and outlet holes 6 in the embodiment of the utility model are rectangular holes arranged along the front-to-back direction, and are arranged on the left or right side of the front part of the lower foundation 2 .

[0010] More specifically, the height of the exposed portion 3 in the embodiment of the present invention is 500-700 mm, and the length of the top plate 4 is 800-1500 mm.

[0011] Among them, the length of the long bolt mounting notch 12 in the embodiment of the utility model is greater than the length of the bolt 9, the distance between the side close to the corresponding short nut mounting notch 13 and the side of the short nut mounting notch 13 away from the long bolt mounting notch 12 is greater than the screw length of the bolt 9, and its width is greater than the diameter of the head of the bolt 9; the width of the short nut mounting notch 13 is greater than the diameter of the nut 10.

[0012] Among them, the upper and lower parts of the lower foundation 2 in the embodiment of the utility model are respectively provided with a plurality of upper long bolt mounting notches 21 and lower long bolt mounting notches 22, the lower part of the exposed part 3 and the top plate 4 are both provided with upper short nut mounting notches 31, and the bottom plate 1 is provided with lower short nut mounting notches 32; an upper bolt is arranged between the upper long bolt mounting notches 21 and the corresponding upper short nut mounting notches 31, and a lower bolt is arranged between the lower long bolt mounting notches 22 and the corresponding lower short nut mounting notches 32, through holes 11 are arranged on the upper sides of the upper long bolt mounting notches 21 and the lower short nut mounting notches 32, and through holes 11 are arranged on the lower sides of the lower long bolt mounting notches 22 and the upper short nut mounting notches 31; the upper bolt is arranged upward, its head is against the upper side of the upper long bolt mounting notch 21, and its upper end is located in the upper short nut mounting notch 31; the lower bolt is arranged downward, its head is against the lower side of the lower long bolt mounting notch 22, and its lower end is located in the lower short nut mounting notch 32.

[0013] Specifically, the long bolt mounting notch 12 and the short nut mounting notch 13 in the embodiment of the utility model are both vertically arranged rectangular notches; the upper side of the upper long bolt mounting notch 21 is a horizontal side, and the other three sides are beveled sides; the lower side of the lower long bolt mounting notch 22 is a horizontal side, and the other three sides are beveled sides; the lower side of the upper short nut mounting notch 31 is a horizontal side, and the other three sides are beveled sides; the upper side of the lower short nut mounting notch 32 is a horizontal side, and the other three sides are beveled sides; the beveled sides are arranged obliquely from the outside to the inside toward the center of the rectangular notch.

[0014] More specifically, the specification of the bolt 9 in the embodiment of the utility model is M16, and its length is 340mm; the width of the long bolt mounting gap 12 and the short nut mounting gap 13 are the same and both are greater than 80mm, the length of the long bolt mounting gap 12 is greater than 340mm, and the length of the short nut mounting gap 13 is greater than 80mm.

[0015] The beneficial effects brought about by the technical solution provided by the embodiment of the utility model are as follows: the embodiment of the utility model provides a prefabricated assembled ring network cabinet foundation, which is composed of a bottom plate, a lower foundation, an exposed part and a top plate. The lower foundation and the exposed part are both rectangular cylindrical structures, and the bottom plate and the top plate are both rectangular plate structures and are regular. Each structure has a simple structure and can be installed only by bolts and nuts, and is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the prefabricated assembled ring main unit foundation provided by an embodiment of the utility model;

[0017] Figure 2 It is a top view of the foundation of the prefabricated assembled ring main unit provided by the embodiment of the utility model;

[0018] Figure 3 It is a dimensioning diagram of the foundation of the prefabricated assembled ring main unit provided in the embodiment of the utility model;

[0019] Figure 4 It is a side view of the foundation of the prefabricated assembled ring main unit provided by the embodiment of the utility model;

[0020] Figure 5 It is a structural schematic diagram of the locking structure.

[0021] In the figure: 1 bottom plate, 2 lower foundation, 3 exposed part, 4 top plate, 5 air vent, 6 inlet and outlet holes, 7 installation channel steel, 8 inspection hole, 9 bolts, 10 nuts, 11 through hole, 12 long bolt installation gap, 13 short nut installation gap;

[0022] 21 upper long bolt installation notch, 22 lower long bolt installation notch;

[0023] 31 upper short nut installation notch, 32 lower short nut installation notch. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0025] Example 1

[0026] See also Figure 1-5Embodiment 1 provides a prefabricated assembled ring network cabinet foundation, including a base plate 1, a foundation body, a ventilation window 5 on the upper part of the foundation body, an inlet and outlet hole 6 on the lower part of the foundation body, a mounting channel steel 7 on the top of the foundation body, and an inspection hole 8 on the foundation body. The foundation body is arranged in a front-to-back direction, and is arranged on the base plate 1. Its front part is exposed to the ground upward to form an exposed part 3 (the cross section matches the bottom of the ring network cabinet), and its rear part is not exposed to the ground and its upper side is closed. The mounting channel steel 7 is arranged on the top of the exposed part 3 for use in the ring network cabinet. The inspection hole 8 is arranged on the upper rear side of the foundation body, which is specifically a manhole (specifically a circular hole with a circular cover provided on it). The aforementioned structure is basically the same as the structure of the existing ring network cabinet foundation, except that:

[0027] The foundation body in this embodiment is composed of a lower foundation 2, an exposed portion 3 and a top plate 4. The lower foundation 2 and the exposed portion 3 are rectangular cylindrical structures that cooperate with each other, and both are concrete structures with reinforced steel bars. The exposed portion 3 and the top plate 4 are arranged side by side on the top of the lower foundation 2, the lower foundation 2 is arranged on the bottom plate 1, and the inspection hole 8 is arranged on the top plate 4. The inlet and outlet holes 6 are arranged on the lower foundation 2; the inlet and outlet holes 6 are rectangular holes arranged in the front-to-back direction, which are arranged on the left or right side of the front of the lower foundation 2. Specifically, the bottom plate 1 is a rectangular plate arranged in the front-to-back direction, and its left and right sides are aligned with the left and right sides of the lower foundation 2, and its front and back sides are aligned with the front and back sides of the lower foundation 2. The left and right sides of the exposed portion 3 are aligned with the left and right sides of the lower foundation 2, and its front side is aligned with the front side of the lower foundation 2. The top plate 4 is a rectangular plate arranged in the front-to-back direction, with its front side resting against the rear side of the exposed portion 3, its left and right sides aligned with the left and right sides of the lower foundation 2, and its rear side aligned with the rear side of the lower foundation 2. The lower end of the lower foundation 2 and the bottom plate 1, the upper end of the lower foundation 2 and the lower end of the exposed portion 3, and the upper end of the lower foundation 2 and the top plate 4 are all connected by multiple locking structures to achieve fixed connection. Among them, a sealing structure (specifically, it can be a sealant, a waterproof glue, or a water-swelling water stop strip, etc.) is also provided between the lower end of the lower foundation 2 and the bottom plate 1, between the upper end of the lower foundation 2 and the lower end of the exposed portion 3, and between the upper end of the lower foundation 2 and the top plate 4 to achieve sealing at the connection.

[0028] More specifically, the height of the exposed portion 3 in the embodiment of the present invention is 500-700 mm, and the length of the top plate 4 is 800-1500 mm.

[0029] Example 2

[0030] See also Figure 2Embodiment 2 provides a prefabricated assembled ring network cabinet foundation, and its structure is basically the same as that of Embodiment 1, except that: the dimensions of the bottom plate 1 in this embodiment are: 5300mm long, 1350mm wide, and 200mm thick. The dimensions of the lower foundation 2 are: 5300mm long, 1350mm wide, 1500mm high, and 180mm thick. The dimensions of the exposed portion 3 are: 4100mm long, 1350mm wide, 600mm high, and 180mm thick. The dimensions of the top plate 4 are: 1200mm long, 1350mm wide, and 200mm thick. The diameter of the inspection hole 8 is 980mm. Accordingly, the dimensions of the ring network cabinet are: 4000mm long and 1250mm wide.

[0031] Of course, the prefabricated assembled ring main unit foundation in this embodiment can also be of other sizes.

[0032] Example 3

[0033] See also Figure 1-5 , Embodiment 3 provides a prefabricated assembled ring network cabinet foundation, and its structure is basically the same as that of Embodiment 1, except that: the locking structure in this embodiment includes bolts 9, nuts 10 (and gaskets as needed), long bolt installation gaps 12 (including upper long bolt installation gaps 21 and lower long bolt installation gaps 22) and short nut installation gaps 13 (including upper short nut installation gaps 31 and lower short nut installation gaps 32), etc. Among them, the long bolt installation gap 12 is vertically arranged, and is arranged at the upper or lower part of the outer wall of the lower foundation 2. A through hole 11 (specifically a circular hole, the diameter of which is slightly larger than the diameter of the screw rod of the bolt 9) is provided between the corresponding end of the long bolt installation gap 12 and the lower foundation 2 in the vertical direction for the bolt 9 to pass through, and the bolt 9 can be inserted. The short nut installation notch 13 is arranged at the lower part of the outer wall of the exposed part 3, the bottom plate 1 or the top plate 4, and is located directly below or directly above the long bolt installation notch 12. A through hole 11 for the bolt 9 to pass through is arranged between the short nut installation notch 13 and the upper end of the bottom plate 1, the lower end of the top plate 4 or the lower end of the exposed part 3 in the vertical direction, and the nut 10 can be placed in it (it is also convenient for the tightening operation of the nut 10). When tightening, the nut 10 is located in the short nut installation notch 13. The bolt 9 is placed in from the long bolt installation notch 12, and its head is located at the end away from the corresponding short nut installation notch 13. It passes through the through hole 11 upward or downward, and its upper end or lower end is in the short nut installation notch 13 and is locked by the nut 10. Among them, the length of the long bolt installation notch 12 is greater than the length of the bolt 9, and the distance between the side close to the corresponding short nut installation notch 13 and the side of the short nut installation notch 13 away from the long bolt installation notch 12 is greater than the screw length of the bolt 9, and its width is greater than the diameter of the head of the bolt 9. The above structure realizes the placement and installation of the bolt 9. The width of the short nut installation notch 13 is greater than the diameter of the nut 10 .

[0034] Among them, see Figure 1-5, the upper and lower parts of the lower foundation 2 in the embodiment of the utility model are respectively provided with a plurality of upper long bolt installation notches 21 and lower long bolt installation notches 22. The plurality of upper long bolt installation notches 21 are located on the same horizontal plane, and are evenly distributed around the lower foundation 2. The plurality of lower long bolt installation notches 22 are located on the same horizontal plane, and are evenly distributed around the lower foundation 2. The lower part of the exposed part 3 and the top plate 4 are both provided with upper short nut installation notches 31, and the bottom plate 1 is provided with lower short nut installation notches 32. The upper short nut installation notches 31 on the exposed part 3 are located on the same horizontal plane, and are evenly distributed on the front side, left side and right side of the exposed part 3. The upper short nut installation notches 31 on the top plate 4 are located on the same horizontal plane, and are evenly distributed on the rear side, left side and right side of the exposed part 3. The lower short nut installation notches 32 of the bottom plate 1 are located on the same horizontal plane, and are evenly distributed around the bottom plate 1. An upper bolt is arranged between the upper long bolt installation notch 21 and the corresponding upper short nut installation notch 31, and a lower bolt is arranged between the lower long bolt installation notch 22 and the corresponding lower short nut installation notch 32. A through hole 11 is arranged on the upper side of the upper long bolt installation notch 21 and the lower short nut installation notch 32, and a through hole 11 is arranged on the lower side of the lower long bolt installation notch 22 and the upper short nut installation notch 31. The upper bolt is arranged upward, and its head is against the upper side of the upper long bolt installation notch 21, and its upper end is located in the upper short nut installation notch 31. The lower bolt is arranged downward, and its head is against the lower side of the lower long bolt installation notch 22, and its lower end is located in the lower short nut installation notch 32. In this embodiment, the lower long bolt installation notch 22 and the lower short nut installation notch 32 are taken as examples, and the lower short nut installation notch 32 is located directly below the corresponding lower long bolt installation notch 22, and a through hole 11 is arranged between the lower short nut installation notch 32 and the upper end of the bottom plate 1. A through hole 11 is provided on the upper side of the lower short nut mounting notch 32 and the lower side of the lower long bolt mounting notch 22 , and the two through holes are located on the same vertical line.

[0035] Specifically, the long bolt mounting notch 12 and the short nut mounting notch 13 in the embodiment of the utility model are both vertically arranged rectangular notches. The through hole 11 is located at the midline of the rectangular notch. The upper side of the upper long bolt mounting notch 21 is a horizontal side, and the other three sides are beveled sides. The lower side of the lower long bolt mounting notch 22 is a horizontal side, and the other three sides are beveled sides. The lower side of the upper short nut mounting notch 31 is a horizontal side, and the other three sides are beveled sides. The upper side of the lower short nut mounting notch 32 is a horizontal side, and the other three sides are beveled sides. The beveled side is arranged obliquely from the outside to the inside toward the center of the rectangular notch, and the setting of the beveled side facilitates demoulding.

[0036] The through hole 11, the long bolt installation notch 12 and the short nut installation notch 13 are all formed during molding.

[0037] Example 4

[0038] See also Figure 3Embodiment 4 provides a prefabricated assembled ring network cabinet foundation, and its structure is basically the same as that of Embodiment 1, except that: the specification of the bolt 9 in this embodiment is M16, and its length is 340mm. The widths of the long bolt installation gap 12 and the short nut installation gap 13 are the same and both are greater than 80mm (specifically 135mm), the length of the long bolt installation gap 12 is greater than 340mm (specifically 345mm), the length of the short nut installation gap 13 is greater than 80mm (specifically 143mm), and the depths of the long bolt installation gap 12 and the short nut installation gap 13 are both 100mm.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A prefabricated assembled ring network cabinet foundation, comprising a bottom plate (1), a foundation body, a ventilation window (5) on the upper part of the foundation body, an inlet and outlet hole (6) at the lower part of the foundation body, a mounting channel steel (7) on the top of the foundation body, and an inspection hole (8) on the foundation body; the foundation body is arranged in a front-to-back direction, and is arranged on the bottom plate (1), with its front part exposed upward to the ground to form an exposed part (3), and its rear part is not exposed to the ground and its upper side is closed; the mounting channel steel (7) is arranged at the top of the exposed part (3), and the inspection hole (8) is arranged on the upper side of the rear part of the foundation body; characterized in that The foundation body is formed by splicing a lower foundation (2), an exposed portion (3) and a top plate (4); the lower foundation (2) and the exposed portion (3) are mutually matched rectangular cylindrical structures; the exposed portion (3) and the top plate (4) are arranged side by side on the top of the lower foundation (2); the lower foundation (2) is arranged on the bottom plate (1); the inspection hole (8) is arranged on the top plate (4); and the inlet and outlet holes (6) are arranged on the lower foundation (2); The lower end of the lower foundation (2) and the bottom plate (1), the upper end of the lower foundation (2) and the lower end of the exposed portion (3), and the upper end of the lower foundation (2) and the top plate (4) are all connected via a plurality of locking structures; the locking structures include bolts (9), nuts (10), long bolt mounting notches (12), and short nut mounting notches (13); the long bolt mounting notches (12) are arranged vertically, and are arranged at the upper or lower part of the outer wall of the lower foundation (2), and are aligned with the lower foundation (2). A through hole (11) for a bolt (9) to pass through is provided in the vertical direction between the two ends, and the bolt (9) can be inserted into the through hole; the short nut mounting notch (13) is provided on the lower part of the outer wall of the exposed part (3), the bottom plate (1) or the top plate (4), and is located directly below or directly above the long bolt mounting notch (12); a through hole (11) for a bolt (9) to pass through is provided in the vertical direction between the short nut mounting notch (13) and the upper end of the bottom plate (1), the lower end of the top plate (4) or the lower end of the exposed part (3), and the nut (10) can be inserted into the through hole; When locking, the nut (10) is located in the short nut installation notch (13); the bolt (9) is inserted from the long bolt installation notch (12), with its head located at the end away from the corresponding short nut installation notch (13), and it passes through the through hole (11) upward or downward, and its upper end or lower end reaches the short nut installation notch (13) and is locked by the nut (10).

2. The prefabricated assembled ring main unit foundation according to claim 1, characterized in that: The bottom plate (1) is a rectangular plate arranged in the front-to-back direction, with its left and right sides aligned with the left and right sides of the lower foundation (2), and its front and back sides aligned with the front and back sides of the lower foundation (2); the left and right sides of the exposed portion (3) are aligned with the left and right sides of the lower foundation (2), and its front side is aligned with the front side of the lower foundation (2); the top plate (4) is a rectangular plate arranged in the front-to-back direction, with its front side resting on the rear side of the exposed portion (3), its left and right sides aligned with the left and right sides of the lower foundation (2), and its rear side aligned with the rear side of the lower foundation (2).

3. The prefabricated assembled ring main unit foundation according to claim 1, characterized in that: The wire inlet and outlet holes (6) are rectangular holes arranged in the front-to-back direction and are arranged on the left or right side of the front part of the lower foundation (2).

4. The prefabricated assembled ring main unit foundation according to claim 2, characterized in that: The height of the exposed portion (3) is 500-700 mm, and the length of the top plate (4) is 800-1500 mm.

5. The prefabricated assembled ring main unit foundation according to claim 1, characterized in that: The length of the long bolt installation notch (12) is greater than the length of the bolt (9), the distance between the side close to the corresponding short nut installation notch (13) and the side of the short nut installation notch (13) away from the long bolt installation notch (12) is greater than the screw length of the bolt (9), and the width is greater than the diameter of the head of the bolt (9); the width of the short nut installation notch (13) is greater than the diameter of the nut (10).

6. The prefabricated assembled ring main unit foundation according to claim 1, characterized in that: The upper and lower parts of the lower foundation (2) are respectively provided with a plurality of upper long bolt mounting notches (21) and lower long bolt mounting notches (22); the lower part of the exposed part (3) and the top plate (4) are both provided with upper short nut mounting notches (31); the bottom plate (1) is provided with lower short nut mounting notches (32); an upper bolt is provided between the upper long bolt mounting notches (21) and the corresponding upper short nut mounting notches (31); a lower bolt is provided between the lower long bolt mounting notches (22) and the corresponding lower short nut mounting notches (32); The upper sides of the upper long bolt mounting notch (21) and the lower short nut mounting notch (32) are both provided with through holes (11), and the lower sides of the lower long bolt mounting notch (22) and the upper short nut mounting notch (31) are both provided with through holes (11); the upper bolt is arranged upward, its head abuts against the upper side of the upper long bolt mounting notch (21), and its upper end is located in the upper short nut mounting notch (31); the lower bolt is arranged downward, its head abuts against the lower side of the lower long bolt mounting notch (22), and its lower end is located in the lower short nut mounting notch (32).

7. The prefabricated assembled ring main unit foundation according to claim 6, characterized in that: The long bolt installation notch (12) and the short nut installation notch (13) are both vertically arranged rectangular notches; the upper side of the upper long bolt installation notch (21) is a horizontal side, and the other three sides are beveled sides; the lower side of the lower long bolt installation notch (22) is a horizontal side, and the other three sides are beveled sides; the lower side of the upper short nut installation notch (31) is a horizontal side, and the other three sides are beveled sides; the upper side of the lower short nut installation notch (32) is a horizontal side, and the other three sides are beveled sides; the beveled sides are arranged obliquely from the outside to the inside toward the center of the rectangular notch.

8. The prefabricated assembled ring main unit foundation according to claim 1, characterized in that: The specification of the bolt (9) is M16, and its length is 340 mm; the width of the long bolt installation gap (12) and the short nut installation gap (13) are the same and both are greater than 80 mm, the length of the long bolt installation gap (12) is greater than 340 mm, and the length of the short nut installation gap (13) is greater than 80 mm.

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