Prefabricated ring main unit foundation and construction method thereof

Abstract

The application provides a prefabricated ring main unit foundation, which comprises a foundation base and a plurality of well body structural members, each well body structural member is a prefabricated component, and each well body structural member is assembled and connected to form a foundation well body which is wide at the top and narrow at the bottom. The foundation base is provided with a mounting groove in a matching manner, and the foundation well body is supported on the mounting groove. The top well mouth of the foundation well body is suitable for mounting a ring main unit. In addition, the application also relates to a construction method of the ring main unit foundation. The application can realize the assembly construction of the ring main unit foundation. The prefabricated structure of the foundation base and the foundation well body is beneficial to the prefabricated production of the foundation base and the well body structural members respectively and the assembly construction on site, and thus is beneficial to the standardized production and standardized construction of the ring main unit foundation. The foundation well body adopts a groove type structure, has high load bearing capacity, can well bear the pressure of the soil on both sides, and can improve the structural stability and use reliability of the ring main unit foundation.

Description

Technical Field

[0001] This invention belongs to the field of power engineering technology, specifically relating to a prefabricated assembled ring main unit foundation and its construction method. Background Technology

[0002] A ring main unit (RMU) is an electrical transmission and distribution device (high-voltage switchgear) housed in a metal or non-metal insulated cabinet or assembled into a modular ring network power supply unit. Its core components include load switches and fuses. RMUs offer advantages such as simple structure, small size, low cost, improved power supply parameters and performance, and enhanced power supply safety. They are widely used in substations and prefabricated substations in load centers such as urban residential areas, high-rise buildings, large public buildings, and factories.

[0003] Ring main unit foundations are a common type of path infrastructure in power distribution network projects, used to install ring main units. Existing ring main unit foundations mainly adopt cast-in-place construction methods, with the main construction steps being: on-site trench excavation, foundation layer pouring, rebar tying, formwork erection, concrete pouring, concrete curing, formwork removal, and backfilling. Cast-in-place construction has drawbacks such as long construction periods, high construction costs, and the quality being easily affected by on-site factors.

[0004] With the development of prefabricated construction, there are also construction methods for prefabricated ring main unit foundations, such as Chinese patent application CN201910413393.1 and Chinese patent application CN201710940290.1. These ring main unit foundations have problems such as large prefabricated component size, large concrete consumption, poor scalability and engineering flexibility. The large size of the prefabricated components is not only inconvenient for prefabrication, but also relatively inconvenient for transportation, storage and on-site construction. Summary of the Invention

[0005] This invention provides a prefabricated assembled ring main unit foundation, which can at least solve some of the problems existing in the prior art, specifically:

[0006] This invention provides a prefabricated assembled ring main unit foundation, including a foundation base and multiple well body structural components. Each well body structural component is a prefabricated component, and the well body structural components are assembled and connected to form a foundation well body that is wider at the top and narrower at the bottom. The foundation base is provided with a matching mounting groove, and the foundation well body is supported on the mounting groove. The top opening of the foundation well body is suitable for installing the ring main unit.

[0007] The foundation well body is an arc-shaped well body, and the mounting groove is correspondingly an arc-shaped groove.

[0008] Each of the well body structural components is sequentially spliced ​​along the length of the mounting groove. Each well body structural component includes a grooved plate supported on the mounting groove and two wellhead plates connected to the top of the grooved plate. The first and last well body structural components also include well body end plates connected to the side ends of their own grooved plates.

[0009] At least part of the groove plate is a corrugated plate, and the corrugation direction is parallel to the length direction of the mounting groove.

[0010] The upper part of the grooved plate protrudes outside the mounting groove, so that the grooved plate can contact and engage with the surrounding soil.

[0011] The prefabricated assembled ring main unit foundation also includes a limiting structure to prevent the foundation well body from moving relative to the foundation base.

[0012] The prefabricated ring main unit foundation also includes a maintenance passage that communicates with the well cavity of the foundation well body.

[0013] The maintenance access channel includes a chute, which comprises an upper section and a lower section connected to each other. The lower section is connected to a well end plate on one side of the foundation well body, and the axis of the upper section is parallel to the vertical and its top end is adapted to protrude from the ground.

[0014] The base is a prefabricated component.

[0015] The present invention also provides a construction method for the above-mentioned prefabricated assembled ring main unit foundation, including:

[0016] Install the foundation base in the foundation pit;

[0017] Each of the well body components is sequentially installed onto the foundation base and assembled to form the foundation well body; or, the well body components are assembled to form the foundation well body, and then the foundation well body is assembled onto the foundation base.

[0018] Backfill the foundation pit;

[0019] Install the ring main unit onto the top wellhead.

[0020] The present invention has the following beneficial effects:

[0021] This invention enables prefabricated construction of ring main unit (RMU) foundations. The prefabricated structure of the foundation base and foundation well facilitates both the separate prefabrication of the foundation base and well components and on-site assembly construction, thus promoting standardized production and construction of RMU foundations. The foundation well adopts a trough-shaped structure, which has a high load-bearing capacity and can effectively withstand the pressure from the soil on both sides, improving the structural stability and reliability of the RMU foundation while significantly reducing concrete usage. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the ring main unit foundation provided in an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the structure of the base provided in an embodiment of the present invention;

[0024] Figures 3-6 This is a schematic diagram of the structure of the well body provided in an embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of a well structure with drainage holes provided in an embodiment of the present invention;

[0026] Figure 8 for Figure 7 A schematic diagram showing the fit between the well body structural components and the foundation base;

[0027] Figure 9 This is a schematic diagram of the chute provided in an embodiment of the present invention. Detailed Implementation

[0028] 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 a part of the present invention, and not all of the 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.

[0029] like Figure 1 This invention provides a prefabricated assembled ring main unit foundation, including a foundation base 1 and multiple well body structural components 21. Each well body structural component 21 is a prefabricated component. The well body structural components 21 are assembled and connected to form a foundation well body 2 that is wider at the top and narrower at the bottom. The foundation base 1 is provided with a matching mounting groove. The foundation well body 2 is supported on the mounting groove. The top well opening of the foundation well body 2 is suitable for installing the ring main unit.

[0030] In one embodiment, the aforementioned foundation base 1 is also a precast component, including but not limited to reinforced concrete structures. For example... Figure 2 The foundation base 1 is provided with bolt assembly holes (shown in the diagram, not standard) for bolt assembly with the pad layer, for example, by pre-embedding anchor bolts in the pad layer. This method facilitates the installation of the foundation base 1 and also ensures the reliability of the installation. During later operation, the position is stable and can reliably bear the load, effectively transferring the load to the pad layer and the soil below. In addition, the flatness and height of the foundation base 1 can be adjusted by bolts to ensure the installation quality of the ring main unit foundation.

[0031] Preferably, such as Figure 2 The aforementioned foundation base 1 includes a base plate 11 and a mounting groove 12. The mounting groove 12 protrudes from the upper surface of the base plate 11. This design reduces the thickness of the foundation base 1, thus reducing the amount of material (such as concrete) used, and also facilitates transportation and installation. Preferably, the mounting groove 12 and the base plate 11 are integrally formed. When the foundation base 1 is surrounded by soil, the gap between the mounting groove 12 and the base plate 11 can be filled with soil, meaning the protruding mounting groove 12 can be supported by the soil, thereby improving the load-bearing capacity of the mounting groove 12.

[0032] The aforementioned mounting groove can be an arc-shaped groove, a V-shaped groove, a trapezoidal groove wider at the top and narrower at the bottom, or even an irregularly shaped groove in the form of a W. The bottom structure of the foundation well body 2 is adapted to fit this groove. In one embodiment, such as... Figure 1 and Figure 2 The foundation well body 2 is an arc-shaped well body, and the installation groove is correspondingly an arc-shaped groove. The arc-shaped well body / arc-shaped groove not only facilitates prefabrication, but more importantly, this arc-shaped structure has a high load-bearing capacity and can also withstand the pressure of the soil on both sides.

[0033] like Figure 1 Each of the well body structural components 21 is sequentially spliced ​​along the length of the mounting groove. Each well body structural component 21 includes a grooved plate 211 supported on the mounting groove and two wellhead plates 212 connected to the top of the grooved plate 211. The first and last well body structural components 21 also include well body end plates 213 connected to the side ends of their own grooved plates 211. The wellhead plates 212 can be connected to form a top wellhead. The wellhead plates 212 have a certain width, thus facilitating connection with the ring main unit. Embedded parts and connectors can be installed on the wellhead plates 212 for connection with the ring main unit.

[0034] The above structure facilitates the prefabricated installation of the foundation well body 2. The well body structural component 21 can be produced as a standard part, thus facilitating standardized production and construction, improving the production quality of prefabricated components and the quality of on-site construction. The number of well body structural components 21 can be set according to actual project requirements, thus providing strong scalability and improving the engineering flexibility and applicability of the ring main unit foundation.

[0035] For the splicing between well body structural components 21, assembly methods such as tenon joints and bolted connections can be used. In one embodiment, such as... Figure 3 and Figure 4The ends of the well body structural component 21 adopt a tongue-and-groove plate 214 structure, and adjacent well body structural components 21 are spliced ​​together using a tongue-and-groove joint; furthermore, a first bolt hole 215 is opened on the tongue-and-groove plate 214, and the two spliced ​​tongue-and-groove plates 214 are also fixed with bolts, wherein the axis of the first bolt hole 215 is perpendicular to the length direction of the mounting groove; this method can effectively improve the connection reliability and structural integrity between the well body structural components 21; in this method, it is preferable to complete the assembly of the basic well body 2 before placing the basic well body 2 onto the foundation base 1. In another embodiment, such as Figure 5 and Figure 6 The end of the well body structural component 21 is provided with a connecting plate 217, and a second bolt hole 218 is opened on the connecting plate 217. When two adjacent well body structural components 21 are spliced, the connecting plates 217 of the two are pressed together and fixed by bolts. The axis of the second bolt hole 218 is parallel to the length direction of the mounting groove. In this way, the basic well body 2 can be placed on the foundation base 1 after the assembly of the basic well body 2 is completed, or the well body structural component 21 can be placed on the foundation base 1 while the splicing between adjacent well body structural components 21 is completed.

[0036] In one embodiment, such as Figure 1 , Figures 3-6 At least a portion of the groove plate 211 is a corrugated plate, and the corrugation direction is parallel to the groove length direction of the mounting groove; the corrugated structure can improve the structural strength and stress performance of the well body structural component 21, thereby improving the load bearing capacity and reliability of the ring main unit foundation.

[0037] Furthermore, when the aforementioned channel plate 211 comes into contact with the soil, the corrugated structure increases the friction between it and the soil, resulting in higher structural stability and further enhancing the load-bearing capacity of the ring main unit foundation. It also allows for faster load transfer to the surrounding soil. Correspondingly, as... Figure 1 The upper part of the grooved plate 211 is exposed outside the mounting groove, so that the grooved plate 211 can contact and engage with the surrounding soil. That is, the groove depth of the grooved plate 211 is greater than the groove depth of the mounting groove.

[0038] Furthermore, the prefabricated assembled ring main unit foundation also includes a limiting structure to prevent the foundation well body 2 from moving relative to the foundation base 1, which can improve the structural stability and reliability of the foundation well body 2, thereby ensuring the operational stability and reliability of the ring main unit above.

[0039] In one embodiment, such as Figures 1-6The limiting structure includes a limiting groove 216 and a limiting strip 13 fitted into the limiting groove 216. The length direction of the limiting groove 216 is parallel to the length direction of the mounting groove. Of the two limiting parts, one limiting part is formed in the mounting groove, and the other limiting part is formed at the bottom of the foundation well body 2. For example, the limiting strip 13 protrudes into the mounting groove, while the limiting groove 216 is formed at the bottom of the foundation well body 2. The length of the limiting strip 13 can be less than or equal to the length of the mounting groove; the number of limiting strips 13 is not limited to one.

[0040] In one embodiment, for the well body structure 21 with a corrugated structure, its troughs are defined to be close to the mounting groove (generally in contact with the mounting groove 12), and its crests are far from the mounting groove. A water pumping pipe is also connected to the foundation of the ring main unit. The water pumping pipe is laid in the corrugated groove between two adjacent troughs. The water pumping pipe is used to pump out the water accumulated in the foundation well body 2 to ensure the dryness of the ring main unit foundation. This can prevent excessive water accumulation in the foundation well body 2 from affecting the operational stability and safety of the ring main unit.

[0041] Optionally, such as Figure 7 and Figure 8 When the limiting strip 13 set in the installation groove is a hollow limiting strip 13, drainage holes 219 can be provided at each trough of the well body structure 21. The drainage holes 219 are connected to the hollow inner cavity of the limiting strip 13, so that the water accumulated in each well body structure 21 can be drained into the limiting strip 13. Correspondingly, the above-mentioned water pumping pipe can be connected to the limiting strip 13 and connected to the hollow inner cavity of the limiting strip 13, so that the water accumulated in the foundation well body 2 can be easily pumped out.

[0042] The corrugated structure of the well body component 21 facilitates the installation of the pumping pipe, which can be laid out from the surrounding soil with minimal impact on the ring main unit foundation. It also allows for convenient and reliable removal of accumulated water from the foundation well body 2. The structure is simple, the operation is reliable, and it balances construction convenience, operational reliability, and cost. Furthermore, the pumping pipe can also be used for ventilation / air exchange within the foundation well body 2, ensuring that air humidity and other parameters within the well body meet requirements.

[0043] More preferably, a horizontal partition is provided in the foundation well body 2. This partition can divide the well cavity of the foundation well body 2 into upper and lower spaces. The upper space can be used for the laying of relevant cables, etc. At the same time, the partition can better support these cables. The cable passage hole 219 provided on the well body end plate 213 is located above the partition. The water accumulated in the foundation well body 2 will be deposited in the lower space, which can reduce the impact of water accumulation on the humidity of the foundation well body 2.

[0044] More preferably, the prefabricated assembled ring main unit foundation also includes a maintenance passage communicating with the well cavity of the foundation well body 2. In one embodiment, such as Figure 1 and Figure 9 The maintenance channel includes a chute 3, which includes an upper pipe section 31 and a lower pipe section 32 connected to each other. The lower pipe section 32 is connected to a well end plate 213 on one side of the foundation well body 2. The axis of the upper pipe section 31 is parallel to the vertical and its top end is adapted to protrude from the ground. Furthermore, the upper pipe section 31 and the lower pipe section 32 can be connected by a transition pipe section 33.

[0045] Based on the above structure, maintenance personnel can slide into the foundation well body 2 through the chute 3. The structure is simple and the operation is convenient. The above maintenance passage does not require the traditional high and low well method, which can not only greatly save concrete usage and shorten the construction period, but also the above chute 3 is easy to seal, which can ensure the sealing of the ring main unit foundation, thereby improving the operational stability and safety of the ring main unit.

[0046] This invention also provides a construction method for the above-mentioned prefabricated assembled ring main unit foundation, including:

[0047] Install the foundation base 1 in the foundation pit;

[0048] Each of the well body components is sequentially installed onto the foundation base 1 and assembled to form the foundation well body 2; or, each of the well body components is assembled to form the foundation well body 2, and then the foundation well body 2 is assembled onto the foundation base 1.

[0049] Backfill the foundation pit;

[0050] Install the ring main unit onto the top wellhead.

[0051] 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 within the protection scope of the present invention.

Claims

1. A prefabricated assembled ring main unit foundation, characterized in that: It includes a base and multiple well body structural components, each of which is a prefabricated component. The well body structural components are assembled and connected to form a base well body that is wider at the top and narrower at the bottom. The base is provided with a matching mounting groove, and the base well body is supported on the mounting groove. The top opening of the base well body is suitable for installing a ring main unit. Each of the well body structural components is sequentially spliced ​​along the length of the mounting groove. Each well body structural component includes a grooved plate supported on the mounting groove and two wellhead plates connected to the top of the grooved plate. The first and last well body structural components also include well body end plates connected to the side ends of their own grooved plates. At least part of the grooved plate is a corrugated plate, and the corrugation direction is parallel to the length direction of the mounting groove; the upper part of the grooved plate protrudes outside the mounting groove, so that the grooved plate can contact and interlock with the surrounding soil. The ring main unit foundation also includes a limiting structure to prevent the foundation well body from moving relative to the foundation base; the limiting structure includes a limiting groove and a limiting strip fitted into the limiting groove, the length direction of the limiting groove is parallel to the length direction of the mounting groove, the limiting strip is formed in the mounting groove, and the limiting groove is formed at the bottom of the foundation well body; the limiting strip is a hollow limiting strip, and drainage holes are provided at each trough of the well body structural component, the drainage holes communicating with the hollow inner cavity of the limiting strip; The ring main unit is also connected to a water pumping pipe, which is laid in the corrugated groove between two adjacent troughs and connected to the limiting strip, communicating with the hollow inner cavity of the limiting strip.

2. The prefabricated assembled ring main unit foundation according to claim 1, characterized in that: The foundation well body is an arc-shaped well body, and the mounting groove is correspondingly an arc-shaped groove.

3. The prefabricated assembled ring main unit foundation according to claim 1, characterized in that: It also includes a maintenance passage that communicates with the well cavity of the foundation well body.

4. The prefabricated assembled ring main unit foundation according to claim 3, characterized in that: The maintenance access channel includes a chute, which comprises an upper section and a lower section connected to each other. The lower section is connected to a well end plate on one side of the foundation well body, and the axis of the upper section is parallel to the vertical and its top end is adapted to protrude from the ground.

5. The prefabricated assembled ring main unit foundation according to claim 1, characterized in that: The base is a prefabricated component.

6. The construction method for the prefabricated assembled ring main unit foundation according to any one of claims 1 to 5, characterized in that, include: Install the foundation base in the foundation pit; Each of the well body components is sequentially installed onto the foundation base and assembled to form the foundation well body; Alternatively, the well body components can be assembled to form a basic well body, and then the basic well body can be assembled onto the foundation base. Backfill the foundation pit; Install the ring main unit onto the top wellhead.

Images