A kind of assembled foundation of power distribution building of substation and construction method thereof

Abstract

A prefabricated foundation for a power distribution building of a transformer substation and a construction method thereof, wherein the prefabricated foundation comprises a base plate module, a pedestal module, and four embedded parts, wherein the base plate module comprises a first base plate prefabricated block, a second base plate prefabricated block, and transverse connecting ribs, wherein the first base plate prefabricated block comprises a first base plate body and a first longitudinal connecting rib, wherein the second base plate prefabricated block comprises a second base plate body and a second longitudinal connecting rib, wherein the first longitudinal connecting rib and the second longitudinal connecting rib have a first U-shaped structure and a second U-shaped structure, wherein the transverse connecting rib is passed through the overlapping portion of the first U-shaped structure and the second U-shaped structure, and connected by concrete pouring, wherein the bottoms of the four embedded parts are buried at the tops of the first base plate body and the second base plate body, wherein the pedestal module is provided with four reserved holes, wherein the tops of the embedded parts are extended into the reserved holes and connected by concrete pouring. The present invention not only improves the transverse bending bearing capacity of the post-cast zone, but also enhances the connection strength between the pedestal module and the base plate module.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrical equipment foundation structures, and in particular relates to an assembled foundation for a power distribution building of a transformer substation and a construction method thereof. Background Art

[0002] The modular construction of substations is characterized by prefabrication and assembly. The prefabrication and assembly of the main building structure and enclosure wall panels has been realized. Other facilities in the station, such as walls, fire walls, and small equipment foundations, have also been prefabricated and assembled. As one of the most important parts of the building structure, the prefabricated foundation also needs to meet the requirements of compressive and bending bearing capacity.

[0003] At present, some achievements have been made in the design technology of prefabricated foundation. The invention patent with application publication number CN115680014B discloses a prestressed prefabricated foundation structure with mortise and tenon structure and its construction method. The method proposes a prefabricated foundation structure in which prefabricated bottom plate, columns and other components are linked by anchor mechanism, sleeve grouting and mortise and tenon structure, but there are shortcomings such as difficult to control the accuracy of sleeve grouting, complex prestressing and difficult anti-corrosion treatment. The invention patent with application publication number CN116607558A discloses a prefabricated foundation of main transformer equipment of substation and its construction method. The method is composed of four prefabricated bottom plate modules overlapped by reserved distribution steel bars and then poured with concrete to form a bottom plate, and connected with prefabricated piers by connecting parts, thereby forming a complete prefabricated foundation of main transformer equipment of substation, but there are shortcomings such as poor bending bearing capacity in the direction perpendicular to the stressed steel bars in the post-casting area, and weak connection between the bottom plate and the pier, which cannot be directly used for building foundation. In view of this, it is necessary to design an improved prefabricated foundation and its construction method to solve the problems in the above technical solutions. Summary of the invention

[0004] The purpose of the present invention is to provide a substation distribution building assembled foundation and a construction method thereof, which can improve the bending bearing capacity of the post-casting area in the direction perpendicular to the stressed steel bars and the connection strength between the bottom plate and the pier.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] In a first aspect, the present invention provides an assembled foundation for a power distribution building of a substation, comprising a base plate module, a pedestal module located above the base plate module;

[0007] The base plate module comprises a first base plate prefabricated block and a second base plate prefabricated block, the first base plate prefabricated block comprises a first base plate body and a plurality of first longitudinal connecting ribs, one end of the first longitudinal connecting rib is buried in the first base plate body, the other end of the first longitudinal connecting rib is firstly cantilevered out of the long side of the first base plate body close to the second base plate body by a certain distance, then bent upward to form a first U-shaped structure and then buried in the first base plate body, the second base plate prefabricated block comprises a second base plate body and a plurality of second longitudinal connecting ribs, one end of the second longitudinal connecting rib is buried in the second base plate body, the other end of the second longitudinal connecting rib is firstly cantilevered out of the long side of the second base plate body close to the second base plate body by a certain distance, then bent upward to form and then buried in the second base plate body, the first U-shaped structure and the second U-shaped structure are alternately arranged, and a transverse connecting rib is penetrated in the overlapping part of the first U-shaped structure and the second U-shaped structure, and the transverse connecting rib is connected to the first U-shaped structure and the second U-shaped structure by concrete pouring;

[0008] The prefabricated foundation also includes four embedded parts, the bottoms of two of the embedded parts are buried in the top of the first base plate body, and the bottoms of the other two embedded parts are buried in the top of the second base plate body. Four reserved holes are provided on the pedestal module, and the tops of the embedded parts are extended into the reserved holes and connected by concrete pouring.

[0009] The first floor prefabricated block further includes a first long longitudinal rib, a first short longitudinal rib, and a first concrete tenon, wherein one end of the first long longitudinal rib is buried at a short side of the first floor body, the other end of the first long longitudinal rib is buried in the first concrete tenon, and the first short longitudinal rib is buried at another short side of the first floor body;

[0010] The second base plate prefabricated block further includes a second long longitudinal rib, a second short longitudinal rib, and a second concrete tenon, wherein one end of the second long longitudinal rib is buried at a short side of the second base plate body, the other end of the second long longitudinal rib is buried in the second concrete tenon, and the second short longitudinal rib is buried at another short side of the second base plate body;

[0011] The first concrete tenon is arranged opposite to the second short longitudinal reinforcement, and the second concrete tenon is arranged opposite to the first short longitudinal reinforcement.

[0012] The first floor prefabricated block further comprises a plurality of first long transverse ribs, wherein the first long transverse ribs are overlapped on the first longitudinal connecting ribs, the first long longitudinal ribs, and the first short longitudinal ribs;

[0013] The second bottom plate prefabricated block further includes a plurality of second long transverse ribs, and the second long transverse ribs are overlapped on the second longitudinal connecting ribs, the second long longitudinal ribs, and the second short longitudinal ribs.

[0014] The maximum spacing between two adjacent first longitudinal connecting ribs and the maximum spacing between two adjacent second longitudinal connecting ribs are both 200 mm;

[0015] The maximum spacing between two adjacent first long transverse ribs and the maximum spacing between two adjacent second longitudinal connecting ribs are both 200 mm.

[0016] The lengths of the first U-shaped structure and the second U-shaped structure are at least 280 mm.

[0017] The overlapping length of the first U-shaped structure and the second U-shaped structure is at least 260 mm.

[0018] The lateral distance between the first U-shaped structure and the second U-shaped structure is 50 mm.

[0019] The first bottom plate body and the first concrete tenon are cast in one piece, and the second bottom plate body and the second concrete tenon are cast in one piece.

[0020] The embedded part is a cylindrical steel cage.

[0021] In a second aspect, the present invention provides a construction method for an assembled foundation of a substation distribution building, the construction method comprising:

[0022] Step S1, completing the casting of the first base plate prefabricated block, the second base plate prefabricated block, and the pedestal module; embedding the embedded parts when casting the first base plate prefabricated block and the second base plate prefabricated block, and reserving the reserved holes when casting the pedestal module;

[0023] Step S2, aligning the long sides of the first floor prefabricated block with the second floor prefabricated block, adjusting the first U-shaped structure in the first floor prefabricated block to overlap the second U-shaped structure in the second floor prefabricated block, and forming a post-casting zone between the long side of the first floor prefabricated block and the long side of the second floor prefabricated block;

[0024] Step S3, inserting the transverse connecting ribs into the overlapping part of the first U-shaped structure and the second U-shaped structure, and connecting the first floor prefabricated block and the second floor prefabricated block into a floor module by pouring concrete in the post-cast zone;

[0025] Step S4, adjust the four embedded parts to align with the four reserved holes, place the pedestal module on the base plate module, and pour concrete into the reserved holes to connect the pedestal module and the base plate module to form an assembled foundation.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. In the assembled foundation of the power distribution building of a substation described in the present invention, on the one hand, the first longitudinal connecting rib is extended out of the long side of the first base plate body close to the second base plate body for a certain distance and then bent upward, and the second longitudinal connecting rib is extended out of the long side of the second base plate body close to the first base plate body for a certain distance and then bent upward, and the first U-shaped structure and the second U-shaped structure formed by bending ensure the connection strength of the post-casting area while reducing the overall steel bar consumption of the assembled foundation, and on the other hand, transverse connecting ribs are added to the overlapping part of the first U-shaped structure and the second U-shaped structure, and the transverse bending bearing capacity of the post-casting area is improved by the transverse connecting ribs; in addition, embedded parts are arranged on the first base plate body and the second base plate body, and after the embedded parts are extended into the reserved holes on the pedestal module, the pedestal module and the base plate module can be connected as a whole by pouring concrete in the reserved holes, thereby reducing the secondary joints between the pedestal module and the base plate module, thereby enhancing the connection strength between the pedestal module and the base plate module, and the application in power facilities is suitable.

[0028] 2. In the prefabricated foundation of the substation distribution building described in the present invention, the embedded parts are cylindrical steel cages, which ensure the bearing capacity of the prefabricated foundation under tension and compression and bending; and the prefabricated foundation has exposed steel components, which avoids the corrosion problems caused by the existing prefabricated foundation using exposed steel components for connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the assembled foundation of the substation distribution building according to the present invention.

[0030] Figure 2 It is a schematic structural diagram of the first base plate prefabricated block in the present invention.

[0031] Figure 3 This is a diagram showing the internal structure of the first base plate prefabricated block in the present invention.

[0032] Figure 4 It is a schematic structural diagram of the second base plate prefabricated block in the present invention.

[0033] Figure 5 This is a diagram showing the internal structure of the second base plate prefabricated block in the present invention.

[0034] Figure 6 It is a schematic diagram of the assembly of the transverse connecting ribs and the first U-shaped structure and the second U-shaped structure in the present invention.

[0035] Figure 7 It is a schematic diagram of the structure of the embedded parts in the present invention.

[0036] Figure 8 It is a schematic diagram of assembling the first base plate prefabricated block and the second base plate prefabricated block in the present invention.

[0037] Fig. 9It is a structural schematic diagram of the bottom plate module in the present invention.

[0038] Fig.10 It is a structural schematic diagram of the pedestal module in the present invention.

[0039] Fig.11 This is a diagram of the internal structure of the pedestal module in the present invention.

[0040] Fig.12 It is a schematic diagram of assembling the bottom plate module and the pedestal module in the present invention.

[0041] Fig.13 It is a structural schematic diagram of the heap load test device.

[0042] Fig.14 is the measured load-settlement curve of the prefabricated foundation.

[0043] In the figure, the base plate module 1, the first base plate prefabricated block 11, the first base plate body 111, the first longitudinal connecting rib 112, the first U-shaped structure 113, the first long longitudinal rib 114, the first short longitudinal rib 115, the first concrete tenon 116, the first long transverse rib 117, the second long transverse rib 127, the second base plate prefabricated block 12, the second base plate body 121, the second longitudinal connecting rib 122, the second U-shaped structure 123, the second long longitudinal rib 124, the second short longitudinal rib 125, the second concrete tenon 126, the transverse connecting rib 13, the pedestal module 2, the reserved hole 21, the embedded part 3, the post-casting zone 4, the concrete block 5, the concrete reaction pier 6, the jack 7, and the displacement sensor 8. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below in conjunction with specific implementation methods and drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] See also Figures 1 to 6The present invention provides an assembled foundation for a power distribution building of a substation, comprising a base plate module 1 and a pedestal module 2 located above the base plate module 1. The base plate module 1 comprises a first base plate prefabricated block 11 and a second base plate prefabricated block 12. The first base plate prefabricated block 11 comprises a first base plate body 111 and a plurality of first longitudinal connecting ribs 112. One end of the first longitudinal connecting rib 112 is buried in the first base plate body 111. The other end of the first longitudinal connecting rib 112 is firstly cantilevered out of the first base plate body 111 by a certain distance from the long side of the second base plate body 121, and then bent upward to form a first U-shaped structure 113 and then buried in the first base plate body 111. The second base plate prefabricated block 12 comprises a second base plate The second bottom plate body 121 and a plurality of second longitudinal connecting ribs 122 are embedded in the second bottom plate body 121. The other end of the second longitudinal connecting rib 122 is firstly cantilevered out of the second bottom plate body 121 and close to the long side of the second bottom plate body 121 by a certain distance, and then bent upward to form a second U-shaped structure 123 and then embedded in the second bottom plate body 121. The first U-shaped structure 113 and the second U-shaped structure 123 are alternately arranged. The overlapping part of the first U-shaped structure 113 and the second U-shaped structure 123 is penetrated with a transverse connecting rib 13. The transverse connecting rib 13 is connected to the first U-shaped structure 113 and the second U-shaped structure 123 by pouring concrete.

[0046] The assembled foundation also includes four embedded parts 3, the bottoms of two embedded parts 3 are buried in the top of the first base plate body 111, and the bottoms of the other two embedded parts 3 are buried in the top of the second base plate body 121. Four reserved holes 21 are provided on the pedestal module 2, and the tops of the embedded parts 3 are extended into the reserved holes 21 and connected by concrete pouring.

[0047] In another specific embodiment, see Figure 3 , Figure 5 The first floor prefabricated block 11 further includes a first long longitudinal rib 114, a first short longitudinal rib 115, and a first concrete tenon 116. One end of the first long longitudinal rib 114 is buried at one short side of the first floor body 111, the other end of the first long longitudinal rib 114 is buried in the first concrete tenon 116, and the first short longitudinal rib 115 is buried at the other short side of the first floor body 111.

[0048] The second floor prefabricated block 12 further includes a second long longitudinal rib 124, a second short longitudinal rib 125, and a second concrete tenon 126. One end of the second long longitudinal rib 124 is buried at one short side of the second floor body 121, the other end of the second long longitudinal rib 124 is buried in the second concrete tenon 126, and the second short longitudinal rib 125 is buried at the other short side of the second floor body 121.

[0049] The first concrete tenon 116 is arranged opposite to the second short longitudinal bar 125, and the second concrete tenon 126 is arranged opposite to the first short longitudinal bar 115. The number of the first long longitudinal bar 114 and the first short longitudinal bar 115 is the same, both are 2. The number of the second long longitudinal bar 124 and the second short longitudinal bar 125 is the same, both are 2.

[0050] In another specific embodiment, see Figure 3 , Figure 5 The first floor prefabricated block 11 further includes a plurality of first long transverse ribs 117, and the first long transverse ribs 117 are overlapped on the first longitudinal connecting ribs 112, the first long longitudinal ribs 114, and the first short longitudinal ribs 115;

[0051] The second bottom plate prefabricated block 12 further includes a plurality of second long transverse ribs 127 , which are overlapped on the second longitudinal connecting ribs 122 , the second long longitudinal ribs 124 , and the second short longitudinal ribs 125 .

[0052] In another specific embodiment, the maximum spacing between two adjacent first longitudinal connecting ribs 112 and the maximum spacing between two adjacent second longitudinal connecting ribs 122 are both 200 mm;

[0053] In another specific embodiment, the maximum spacing between two adjacent first long transverse ribs 117 and the maximum spacing between two adjacent second longitudinal connecting ribs 122 are both 200 mm.

[0054] In another specific embodiment, the lengths of the first U-shaped structure 113 and the second U-shaped structure 123 are at least 280 mm. The first concrete tenon 116 is the same length as the first U-shaped structure 113 , and the second concrete tenon 126 is the same length as the second U-shaped structure 123 .

[0055] In another specific embodiment, the overlapping portion of the first U-shaped structure 113 and the second U-shaped structure 123 has a length of at least 260 mm. The number of the transverse connecting ribs 13 is 16, and the length of the transverse connecting ribs 13 is 600 mm.

[0056] In another specific embodiment, in order to prevent the first U-shaped structure 113 and the second U-shaped structure 123 from interfering with each other when docking, the second U-shaped structure 123 needs to be translated 50 mm in the direction of the second concrete tenon 126. Therefore, after docking, the lateral distance between the first U-shaped structure 113 and the second U-shaped structure 123 is 50 mm.

[0057] In another specific embodiment, the first bottom plate body 111 and the first concrete tenon 116 are cast and formed as one piece, and the second bottom plate body 121 and the second concrete tenon 126 are cast and formed as one piece.

[0058] In another specific embodiment, see Figure 7 , the embedded part 3 is a cylindrical steel cage. The outer diameter of the steel cage is 200mm and the height is 400mm. The steel cage is composed of two "J"-shaped steel bars and two annular stirrups. The two "J"-shaped steel bars are placed crosswise, and the spacing between the two annular stirrups is 150mm. When casting the first base plate precast block 11, the steel cage is tied and fixed to the first longitudinal connecting rib 112 and the first long transverse rib 117 by steel wire, and then the steel cage is covered from top to bottom with a PVC pipe with a diameter exceeding 250mm, and finally concrete is poured, and the production of the first base plate precast block 11 is completed; the production steps of the second base plate precast block 12 are the same as the production steps of the first base plate precast block 11.

[0059] See also Fig.10 , Fig.11 The steel skeleton of the pedestal module 2 includes a steel mesh and a square cage. The steel mesh is welded by longitudinal bars and transverse steels. The square cage is made of L-shaped steel bars and square stirrups. The spacing between the L-shaped steel bars is 125mm, and the spacing between the square stirrups is 150mm. After the square cage is made, it is welded with the steel mesh. When making the pedestal module 2, it is necessary to reserve enough space for the vertical reserved holes 21 in the pedestal module 2. Therefore, the maximum spacing between the longitudinal bars and the transverse steels in the steel mesh is set to 300mm. The maximum spacing only refers to the spacing between the steel bars on both sides of the reserved holes 2. To ensure the overall strength of the component, the spacing between the remaining longitudinal bars and the transverse steels shall not exceed 200mm. Before pouring the pedestal module 2, first place the inverted truncated cone mold in the space reserved for the reserved holes 21, and then pour the concrete. In order to prevent the inverted truncated cone mold from being compressed and deformed, a cross-shaped support is set in the inverted truncated cone mold; the outer surface of the inverted truncated cone mold is wrapped with a plastic film to facilitate later demoulding. The reserved hole 21 finally obtained is an inverted truncated cone-shaped through hole, with a lower end diameter of 220 mm and an upper end diameter of 300 mm.

[0060] In another specific embodiment, a construction method for an assembled foundation of a substation distribution building is provided, and the construction method is performed in the following steps in sequence:

[0061] Step S1, completing the casting of the first base plate prefabricated block 11, the second base plate prefabricated block 12, and the pedestal module 2;

[0062] When casting the first base plate prefabricated block 11 and the second base plate prefabricated block 12, the embedded parts 3 are pre-embedded, and when casting the pedestal module 2, the reserved holes 21 are reserved;

[0063] Step S2, aligning the long sides of the first floor prefabricated block 11 and the second floor prefabricated block 12, adjusting the first U-shaped structure 113 in the first floor prefabricated block 11 and the second U-shaped structure 123 in the second floor prefabricated block 12 to overlap, and forming a post-casting zone 4 between the long side of the first floor prefabricated block 11 and the long side of the second floor prefabricated block 12;

[0064] Step S3, insert the transverse connecting rib 13 into the overlapping part of the first U-shaped structure 113 and the second U-shaped structure 123, adjust the length of the overlapping part of the first U-shaped structure 113 and the second U-shaped structure 123, and then tie the transverse connecting rib 13 and the first U-shaped structure 113 and the second U-shaped structure 123 together with steel bars; pour the post-casting zone 4 with UHPC concrete to connect the first floor slab prefabricated block 11 and the second floor slab prefabricated block 12 into a Fig. 9 The bottom plate module 1 shown in the figure; the bottom plate module 1 before pouring the post-cast zone 4 is as shown in the figure Figure 8 As shown;

[0065] Step S4: Use a lifting device to lift the pedestal module 2, adjust the four embedded parts 3 to align with the four reserved holes 21, place the pedestal module 2 on the base plate module 1, and then fill the reserved holes 21 with UHPC concrete to connect the pedestal module 2 and the base plate module 1 to form a Figure 1 The assembled foundation shown; the assembled foundation before filling the reserved hole 21 is as shown Fig.12 As shown;

[0066] Step S5: After curing for 28 days, the material can be put into use after the curing is completed.

[0067] The prefabricated foundation of the present invention not only has the advantages of higher construction strength and faster construction speed of conventional prefabricated foundations, but also achieves the effects of simple on-site assembly, less pouring workload, and high degree of factory production by reasonably setting the post-casting zone 4, and can meet the load-bearing performance of the 35-750kV substation foundation.

[0068] Performance Verification:

[0069] The loading performance of the prefabricated foundation of the present invention is tested by a pile loading method. The pile loading test device is as follows: Fig.13 As shown, in the stacking method, the eccentric load is provided by the deadweight of the concrete blocks 5 stacked on the beam, and the loading is carried out by the jack 7 controlled by an electric oil pump. The maximum loading force is: axial force 2200 kN, eccentricity 1 is 370.2 kN·m, eccentricity 2 is 73.4 kN·m, and the total weight of the stacking load is 2600 kN; the reaction design values ​​of the concrete reaction pier 6 are: axial force 1100 kN, bending moment 1 is 185.1 kN·m, and bending moment 2 is 86.7 kN·m.

[0070] (1) Fig.14 The load-settlement curve of the prefabricated foundation of the present invention under the action of eccentric load is shown, and the settlement is detected by the displacement sensor 8. Fig.13It can be seen that when loaded to 400kN, the settlement of the prefabricated foundation was 6.936mm, and the absolute value of the slope of the load-settlement curve increased slightly, and then entered a stable state; during the entire subsequent loading process, no cracks occurred on the outer surface of the prefabricated foundation; when loaded to 1000kN, the settlement of the prefabricated foundation was 25.656mm, and two cracks appeared at the bottom of the pedestal module 2 near the load application point. The first crack extended obliquely upward from the bottom of the pedestal module 2, with a length of 65mm and a width of 0.3mm. The second crack was adjacent to the first crack, extending horizontally, with a length of 40mm , width is 0.2mm; it can be seen that the outer surface of the prefabricated foundation has no obvious cracking phenomenon under the design load (design load is 1032kN), and only a small number of tiny vertical cracks and transverse cracks appear; when loaded to 1200kN, the settlement of the prefabricated foundation is 27.58mm, and new vertical cracks appear near the load center, accompanied by the generation of transverse cracks. At this time, the foundation load-displacement curve does not show obvious mutations and still maintains a linear trend; when loaded to 1400kN, the settlement of the prefabricated foundation is 39.336mm, the cracks begin to expand, and new cracks also appear in the parts far away from the load point. In the loading process from 1600kN to 1800kN, the load-settlement curve begins to have an inflection point, the number of new cracks gradually decreases, and the cracks only develop on the original foundation; when loaded to 2 times the design load, transverse cracks appear near the load point on the bottom plate module 1, and the settlement of the prefabricated foundation reaches 49.308mm.

[0071] (2) When the microstrain value of the steel bar reaches 2200με or more, the steel bar is considered to have yielded. When loaded to twice the design load, the first yielding steel bars are concentrated in the post-casting zone 4 and the area near the load center. The steel bars in other parts have not yielded yet, and the overall structure still has a certain bearing capacity. The reason why the steel bars in the post-casting zone 4 yielded first is that, on the one hand, the post-casting zone 4 is located in the middle of the prefabricated foundation and is subject to a large bending moment; on the other hand, the connection between different modules in the post-casting zone 4 is weak, which reduces the concrete connection strength.

[0072] In summary, under the design load, although a small number of cracks appeared in the prefabricated foundation, the whole was intact and still had a large bearing capacity. When loaded to 2 times the design load, some steel bars began to yield, and a large number of vertical cracks and accompanying transverse cracks appeared, but the foundation as a whole did not appear large-scale crushing or damage. The prefabricated foundation of the present invention did not suffer damage under the design load and 2 times the design load, and the bearing capacity can meet the load requirements of the 35-750kV substation foundation.

Claims

1. An assembled foundation for a power distribution building of a substation, comprising a base plate module (1) and a pedestal module (2) located above the base plate module (1), characterized in that: The base plate module (1) comprises a first base plate prefabricated block (11) and a second base plate prefabricated block (12); the first base plate prefabricated block (11) comprises a first base plate body (111) and a plurality of first longitudinal connecting ribs (112); one end of the first longitudinal connecting rib (112) is embedded in the first base plate body (111); the other end of the first longitudinal connecting rib (112) is firstly cantilevered out of the long side of the first base plate body (111) close to the second base plate body (121) by a certain distance, then bent upward to form a first U-shaped structure (113) and then embedded in the first base plate body (111); the second base plate prefabricated block (12) comprises a second base plate body (121) and a plurality of second longitudinal connecting ribs (122); One end of the second longitudinal connecting rib (122) is buried inside the second bottom plate body (121); the other end of the second longitudinal connecting rib (122) is first cantilevered out of the second bottom plate body (121) and close to the long side of the second bottom plate body (121) for a certain distance, then bent upward to form a second U-shaped structure (123) and then buried inside the second bottom plate body (121); the first U-shaped structure (113) and the second U-shaped structure (123) are arranged alternately; a transverse connecting rib (13) is passed through the overlapping part of the first U-shaped structure (113) and the second U-shaped structure (123); the transverse connecting rib (13) is connected to the first U-shaped structure (113) and the second U-shaped structure (123) by pouring concrete; The assembled foundation further comprises four embedded parts (3), the bottoms of two embedded parts (3) being embedded in the top of the first base plate body (111), and the bottoms of the other two embedded parts (3) being embedded in the top of the second base plate body (121), and the pedestal module (2) being provided with four reserved holes (21), and the tops of the embedded parts (3) being extended into the reserved holes (21) and connected by concrete pouring.

2. The assembled foundation of a substation distribution building according to claim 1, characterized in that: The first base plate prefabricated block (11) further comprises a first long longitudinal rib (114), a first short longitudinal rib (115), and a first concrete tenon (116), wherein one end of the first long longitudinal rib (114) is embedded in a short side surface of the first base plate body (111), the other end of the first long longitudinal rib (114) is embedded in the first concrete tenon (116), and the first short longitudinal rib (115) is embedded in another short side surface of the first base plate body (111); The second base plate prefabricated block (12) further comprises a second long longitudinal rib (124), a second short longitudinal rib (125), and a second concrete tenon (126), wherein one end of the second long longitudinal rib (124) is embedded in a short side surface of the second base plate body (121), the other end of the second long longitudinal rib (124) is embedded in the second concrete tenon (126), and the second short longitudinal rib (125) is embedded in another short side surface of the second base plate body (121); The first concrete tenon (116) is arranged opposite to the second short longitudinal reinforcement (125), and the second concrete tenon (126) is arranged opposite to the first short longitudinal reinforcement (115).

3. The assembled foundation of a substation distribution building according to claim 2, characterized in that: The first base plate prefabricated block (11) further comprises a plurality of first long transverse ribs (117), wherein the first long transverse ribs (117) are overlapped on the first longitudinal connecting ribs (112), the first long longitudinal ribs (114), and the first short longitudinal ribs (115); The second base plate prefabricated block (12) further comprises a plurality of second long transverse ribs (127), wherein the second long transverse ribs (127) are overlapped on the second longitudinal connecting ribs (122), the second long longitudinal ribs (124), and the second short longitudinal ribs (125).

4. The assembled foundation of a substation distribution building according to claim 3, characterized in that: The maximum spacing between two adjacent first longitudinal connecting ribs (112) and the maximum spacing between two adjacent second longitudinal connecting ribs (122) are both 200 mm; The maximum spacing between two adjacent first long transverse ribs (117) and the maximum spacing between two adjacent second longitudinal connecting ribs (122) are both 200 mm.

5. A prefabricated foundation for a substation distribution building according to any one of claims 1 to 4, characterized in that: The length of the first U-shaped structure (113) and the second U-shaped structure (123) is at least (280) mm.

6. The assembled foundation of a substation distribution building according to claim 5, characterized in that: The length of the overlapping portion between the first U-shaped structure (113) and the second U-shaped structure (123) is at least (260) mm.

7. A prefabricated foundation for a substation distribution building according to any one of claims 1 to 4, characterized in that: The lateral distance between the first U-shaped structure (113) and the second U-shaped structure (123) is (50) mm.

8. An assembled foundation for a substation distribution building according to any one of claims 2 to 4, characterized in that: The first bottom plate body (111) and the first concrete tenon (116) are cast in one piece, and the second bottom plate body (121) and the second concrete tenon (126) are cast in one piece.

9. An assembled foundation for a substation distribution building according to any one of claims 1 to 4, characterized in that: The embedded part (3) is a cylindrical steel cage.

10. The construction method of the assembled foundation of the power distribution building of a substation according to claim 1, characterized in that: The construction method comprises: Step S1, completing the casting of the first base plate prefabricated block (11), the second base plate prefabricated block (12), and the pedestal module (2); when casting the first base plate prefabricated block (11) and the second base plate prefabricated block (12), the embedded parts (3) are embedded, and when casting the pedestal module (2), the reserved holes (21) are reserved; Step S2, aligning the long sides of the first floor prefabricated block (11) and the second floor prefabricated block (12), adjusting the first U-shaped structure (113) in the first floor prefabricated block (11) and the second U-shaped structure (123) in the second floor prefabricated block (12) to overlap, and forming a post-casting zone between the long side sides of the first floor prefabricated block (11) and the long side sides of the second floor prefabricated block (12); Step S3, inserting the transverse connecting rib (13) into the overlapping part of the first U-shaped structure (113) and the second U-shaped structure (123), and connecting the first floor prefabricated block (11) and the second floor prefabricated block (12) into a floor module (1) by pouring concrete in the post-casting zone; Step S4, adjust the four embedded parts (3) to align with the four reserved holes (21), place the pedestal module (2) on the base plate module (1), pour concrete into the reserved holes (21), and connect the pedestal module (2) and the base plate module (1) to form an assembled foundation.

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