Plug-in type foundation of power transformation framework steel pipe column

Abstract

The invention relates to the technical field of power transformation framework foundations, in particular to a power transformation framework steel pipe column insertion type foundation. The plug-in foundation comprises a framework foundation arranged above the cushion layer, and a cup opening is formed in the framework foundation; a plurality of embedded anchor bolts are arranged in the framework foundation, and two semicircular ring plates are symmetrically mounted on the framework foundation through the embedded anchor bolts; self-compacting concrete used for wrapping the root of the connecting framework steel pipe column is poured in the cup opening. The problem that a framework steel pipe column and concrete in a cup opening can be pulled out together is solved, a framework foundation and a semicircular annular plate can be connected through pre-embedded anchor bolts, and through cooperation of arrangement of an inner transverse partition plate, chiseling of the inner wall of the cup opening, arrangement of an anti-shear stud, welding of a steel bar ring and pouring of self-compacting concrete, the structure is simple, and construction is convenient. The function that the framework steel pipe column, the concrete in the cup opening and the framework foundation are stressed cooperatively can be achieved, the framework steel pipe column can be prevented from sliding, the risk that the framework steel pipe column is pulled out is reduced, and the safety of the column base joint is improved.

Description

Technical Field

[0001] The invention relates to the technical field of transformer substation frame foundations, and in particular to a transformer substation frame steel pipe column insertion foundation. Background Art

[0002] As a key component of the power grid, the substation structure plays an important role in suspending wires and supporting conductors. The substation structure has many classifications according to materials and structural types. Among them, welded ordinary steel pipe structure is more commonly used in conventional substation design, and its processing technology is mature and easy to construct.

[0003] The force on the substation structure is mainly horizontal load, and the tension of the conductor and ground wire is the main horizontal load. Its size is affected by many factors such as conductor spacing, sag, deadweight, ice thickness, etc., and it varies under different meteorological conditions. The foundation type of the substation structure needs to be determined by comprehensive engineering geology, hydrogeology, load properties, materials, construction conditions and cost. Concrete rigid foundation and rigid fixed column base should be used first.

[0004] However, in some high-voltage line-out structures, such as when the span between the 750kV line-out structure and the first tower outside the station is large and the line is hung on one side, although the foundation pull-out and anti-overturning stability calculations have been performed and meet the requirements, there is still a risk that the frame steel pipe columns are pulled out of the frame foundation by external forces, that is, the substation frame steel pipe columns and the concrete in the cup mouth are pulled out of the frame foundation together, and the structural stability is poor; therefore, the problem of the substation frame steel pipe columns and the concrete in the cup mouth being pulled out together needs to be solved urgently, and the stability and reliability of the substation frame foundation need to be improved to ensure the safe and stable operation of the substation; in view of this, we propose an inserted foundation for the substation frame steel pipe columns. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies mentioned in the above background technology and provide a substation frame steel pipe column inserted foundation.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A transformer substation frame steel pipe column insertion foundation, the insertion foundation comprising a frame foundation arranged above a cushion layer, the frame foundation being provided with a cup opening for inserting the frame steel pipe column;

[0008] A plurality of evenly distributed pre-buried anchor bolts are arranged inside the frame foundation, and two semi-circular ring plates are symmetrically installed on the frame foundation through the pre-buried anchor bolts, and the two semi-circular ring plates are used to fix and clamp the frame steel pipe column;

[0009] Self-compacting concrete for covering the root of the steel pipe column connected to the frame is poured in the cup mouth.

[0010] Preferably, a plurality of evenly distributed stiffening ribs are connected to the semicircular ring plate, and full penetration welding is adopted between the two semicircular ring plates.

[0011] Preferably, a concrete protective layer for covering the semicircular ring plate and the stiffening rib plate is provided above the frame foundation.

[0012] Preferably, a concrete protective cap is provided on the concrete protective layer, and the concrete protective cap is used to cover the frame steel pipe column.

[0013] Preferably, the concrete protection cap adopts a regular hexagonal structure, and is arranged to be 120-150 mm higher than the site elevation.

[0014] Preferably, an annular positioning steel plate is provided on the frame steel pipe column and at the lower side of the semicircular ring plate, and the annular positioning steel plate is used to press against the semicircular ring plate from bottom to top to play an anti-pullout role.

[0015] Preferably, an inner transverse partition corresponding to the position of the semicircular ring plate is provided inside the frame steel pipe column.

[0016] Preferably, the thickness of the inner transverse partition is not less than the thickness of the semicircular ring plate.

[0017] Preferably, the inner wall of the cup mouth is roughened, and the surface of the frame steel pipe column located inside the cup mouth is provided with equally distributed shear bolts and welded steel rings.

[0018] Preferably, the spacing between adjacent welded steel bar rings is set to 100-200 mm;

[0019] The shear bolts are arranged perpendicularly to the axis of the frame steel pipe column, and a plurality of the shear bolts are evenly distributed along the surface of the frame steel pipe column at an angle of 15°-45°.

[0020] Therefore, the problem of the steel pipe column of the substation frame and the concrete in the cup mouth being pulled out together needs to be solved urgently, and the stability and reliability of the substation frame foundation needs to be improved to ensure the safe and stable operation of the substation;

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The inserted foundation of the substation frame steel pipe column solves the problem that the frame steel pipe column and the concrete in the cup mouth will be pulled out together. It can connect the frame foundation and the semicircular ring plate through pre-embedded anchor bolts, set internal cross partitions, roughen the inner wall of the cup mouth, set shear bolts, weld steel rings and cast self-compacting concrete. It can achieve the function of coordinated force between the frame steel pipe column, the concrete in the cup mouth and the frame foundation, prevent the frame steel pipe column from slipping, reduce the risk of being pulled out, and improve the safety of the column foot node. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 It is a top plan view of the framework foundation of the present invention;

[0025] Figure 2 A1-A2 cross-sectional view of Example 1 of the present invention;

[0026] Figure 3 It is a cross-sectional view taken along line B1-B2 of Example 1 of the present invention;

[0027] Figure 4 For the present invention Figure 2 and Figure 3 Middle C1-C2 section;

[0028] Figure 5 For the present invention Figure 2 and Figure 3 Middle D1-D2 section;

[0029] Figure 6 A1-A2 cross-sectional view of Example 2 of the present invention;

[0030] Figure 7 It is a cross-sectional view taken along line B1-B2 of Example 2 of the present invention.

[0031] The meaning of each number in the figure is:

[0032] 1. Frame steel pipe column; 2. Frame foundation; 21. Cup mouth; 3. Semicircular ring plate; 4. Inner cross partition; 5. Embedded anchor bolts; 6. Shear bolts; 7. Welded steel ring; 8. Stiffening rib plate; 9. Concrete protective layer; 10. Concrete protective cap; 11. Pad layer; 12. Annular positioning steel plate. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0034] See also Figure 1-Figure 7 The present invention describes the above technical solution in detail through the following embodiments:

[0035] Example 1

[0036] In this embodiment, the substation frame steel pipe column inserted foundation includes: Figure 2 and Figure 3 The frame foundation 2 is shown to be arranged above the cushion layer 11. In this embodiment, the cushion layer 11 is a concrete leveling layer at the bottom of a deep foundation pit. The site elevation in the figure is taken as the horizontal baseline of the ground. The main part of the structure is located below the site elevation and is deeply buried during construction to obtain a stable foundation structure. In order to provide an insertion site for fixing the frame steel pipe column 1, in this embodiment, a cup mouth 21 for inserting the frame steel pipe column 1 is provided on the frame foundation 2. Self-compacting concrete for covering the root of the connecting frame steel pipe column 1 is poured in the cup mouth 21. In order to improve the connectivity, the inner wall of the cup mouth 21 is roughened.

[0037] Specifically, Figure 1-Figure 3 As shown in the structure, in this embodiment, concrete is poured to form a frame foundation 2, and the frame foundation 2 is provided with Figure 5 The eight evenly distributed pre-buried anchor bolts 5 shown in the figure enable the pre-buried anchor bolts 5 to transmit the bending moment and shear force at the bottom of the column when the frame steel pipe column 1 is subjected to tension, thereby achieving the purpose of connecting the frame steel pipe column 1, the concrete in the cup mouth 21 and the frame foundation 2 as a whole and bearing force in coordination; through the pre-buried anchor bolts 5, two semicircular ring plates 3 can be symmetrically installed on the frame foundation 2, so that the semicircular ring plates 3 and the frame foundation 2 form a whole; it should be noted that in order to facilitate the installation of the frame steel pipe column 1, the two semicircular ring plates 3 need to be fully penetrated and welded after installation to fix and clamp the frame steel pipe column 1. In order to improve the structural strength of the semicircular ring plates 3, multiple semicircular ring plates 3 are connected to the semicircular ring plates 3. Figure 5 The uniformly distributed stiffening ribs 8 are shown.

[0038] It should be noted that in order to further improve the installation stability of the frame steel pipe column 1, that is, it is necessary to avoid the self-compacting concrete in the cup mouth 21 of the frame steel pipe column 1 being pulled out of the cup mouth 21 together, the effect of only providing an encapsulated semicircular ring plate 3 is limited, and it is easy to cause structural collapse under stress; therefore, in this embodiment, before welding the semicircular ring plate 3, it is necessary to first put the frame steel pipe column 1 into the cup mouth 21, and pre-weld the annular positioning steel plate 12 at the lower side of the frame steel pipe column 1 at the semicircular ring plate 3. The setting of the annular positioning steel plate 12 can play a positioning role, which is convenient for the lifting of the frame steel pipe column 1 and can limit its insertion depth. At the same time, the annular positioning steel plate 12 can resist the semicircular ring plate 3 from bottom to top and play an anti-pullout role; in addition, in order to avoid structural collapse of the semicircular ring plate 3 or the frame steel pipe column 1, an inner diaphragm 4 corresponding to the position of the semicircular ring plate 3 is provided inside the frame steel pipe column 1, and the thickness of the inner diaphragm 4 is not less than the thickness of the semicircular ring plate 3.

[0039] In order to improve the structural connectivity between the frame steel pipe column 1 and the self-compacting concrete, and then improve the pull-out resistance, the surface of the frame steel pipe column 1 located inside the cup mouth 21 is provided with equally distributed shear studs 6 and welded steel rings 7. In this embodiment, the spacing between adjacent welded steel rings 7 is set to 150mm; and Figure 2 In the structure shown, the shear studs 6 are arranged perpendicular to the axis of the frame steel pipe column 1, and in this embodiment, the shear studs 6 are evenly distributed at an angle of 45° along the surface of the frame steel pipe column 1. Other embodiments can be designed with an angle of 15°, 20° or 30° to increase the number of shear studs 6 in a circle on the frame steel pipe column; when the frame steel pipe column 1 is pulled by external stress, the shear studs 6 and the welded steel ring 7 can transmit the shear force of the column foot, increase the connection force between the frame steel pipe column 1 and the concrete in the cup mouth 21, and between the concrete in the cup mouth 21 and the frame foundation 2, thereby avoiding the risk of the frame steel pipe column 1 and the concrete in the cup mouth 21 being pulled out at the same time. The cup mouth 21 is cast with self-compacting concrete, which can ensure the fluidity and quality of casting. Self-compacting concrete belongs to the existing mature technology in the construction field. It is mainly capable of obtaining dense molding quality. Different strengths have different mature formulas, so it is not described in detail. This embodiment uses C40 strength concrete for construction.

[0040] In order to improve the overall connectivity between the semicircular ring plate 3 and the frame foundation 2, after the semicircular ring plate 3 is installed with the embedded anchor bolts 5, a concrete protective layer 9 covering the stiffening ribs 8 is poured on the plane of the frame foundation 2, and a regular hexagonal concrete protective cap 10 is set at the junction of the frame steel pipe column 1 and the site ground. The concrete protective layer 9 and the concrete protective cap 10 can cover the frame steel pipe column 1 again to provide a supporting covering site. The concrete protective layer 9 and the concrete protective cap 10 can also meet the anti-corrosion requirements of the frame steel pipe column 1, the embedded anchor bolts 5, and the stiffening ribs 8, and can extend the maintenance cycle.

[0041] The transformer substation frame steel pipe column inserted foundation of this embodiment first prefabricates the frame steel pipe column 1, the semicircular ring plate 3 welded with the stiffening rib plate 8 and other parts in the factory, and after deep digging the foundation pit, pours the cushion layer 11 to the bottom elevation of the foundation, then supports the formwork to cast the frame foundation 2, and at the same time puts in the embedded anchor bolts 5 to form together; after the frame foundation 2 is cured and qualified, the cup mouth 21 is roughened, and then the frame steel pipe column 1 welded with the annular positioning steel plate 12 is hoisted into the cup mouth 21, and the cup mouth 21 is poured with self-compacting concrete, and the semicircular ring plate 3 is installed and welded to form a Figure 2 and Figure 3 After the molding structure shown in the figure, a concrete protective layer 9 and a concrete protective cap 10 are poured on top of the frame foundation 2 to the site elevation height. After molding, the frame steel pipe column 1 has good pull-out resistance, and the overall foundation structure forms a whole, which can avoid the problem of the frame steel pipe column 1 with the concrete in the cup mouth 21 being pulled out.

[0042] It should be noted that, in this embodiment, the frame steel pipe column 1, the semicircular ring plate 3 welded with the stiffening rib plate 8, the embedded anchor bolts 5, the shear bolts 6, the welded steel bar ring 7 and the annular positioning steel plate 12 can be pre-welded, which avoids the large discreteness of the weld quality during on-site welding during construction, ensures the construction quality, improves the construction efficiency, is conducive to shortening the construction period, and has higher operability in on-site implementation; this embodiment is suitable for situations where the diameter of the frame steel pipe column 1 is large and workers can enter to weld the inner cross partition 4, for example, when the inner pipe diameter is greater than 700 mm.

[0043] Example 2

[0044] like Figure 6 and Figure 7 The structure shown in this embodiment is different from the embodiment 1 in that: in this embodiment, holes for pouring self-compacting concrete are provided on the frame steel pipe column 1, and the inner transverse diaphragm 4 is not provided. After the self-compacting concrete in the frame steel pipe column 1 is formed and strengthened, the inner transverse diaphragm 4 can be replaced;

[0045] It should be noted that the present embodiment is applicable to situations where the diameter of the frame steel pipe column 1 is relatively small and workers cannot enter to weld the inner transverse diaphragm 4, for example, the inner pipe diameter is less than 700 mm; of course, in Embodiment 1, the frame steel pipe column 1 with an inner pipe diameter greater than 700 mm can also be cast with self-compacting concrete instead of the inner transverse diaphragm 4, and the corresponding implementation method can be selected according to the specific situation during construction.

[0046] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0047] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A substation frame steel pipe column insertion foundation, characterized in that: The insertion-type foundation comprises a frame foundation (2) arranged above a cushion layer (11), and a cup opening (21) for inserting a frame steel pipe column (1) is provided on the frame foundation (2); A plurality of evenly distributed pre-buried anchor bolts (5) are arranged inside the frame foundation (2), and two semi-circular ring plates (3) are symmetrically mounted on the frame foundation (2) via the pre-buried anchor bolts (5), and the two semi-circular ring plates (3) are used to fix and clamp the frame steel pipe column (1); Self-compacting concrete for covering the root of the frame steel pipe column (1) is poured in the cup mouth (21).

2. The substation frame steel pipe column insertion foundation according to claim 1, characterized in that: The semicircular ring plate (3) is connected to a plurality of evenly distributed stiffening ribs (8), and full penetration welding is adopted between the two semicircular ring plates (3).

3. The substation frame steel pipe column insertion foundation according to claim 2, characterized in that: A concrete protective layer (9) for covering the semicircular ring plate (3) and the stiffening rib plate (8) is provided above the frame foundation (2).

4. The substation frame steel pipe column insertion foundation according to claim 3, characterized in that: A concrete protective cap (10) is provided on the concrete protective layer (9), and the concrete protective cap (10) is used to cover the frame steel pipe column (1).

5. The transformer substation steel pipe column insertion foundation according to claim 4, characterized in that: The concrete protection cap (10) adopts a regular hexagonal structure, and the concrete protection cap (10) is arranged 120-150 mm higher than the site elevation.

6. The substation frame steel pipe column insertion foundation according to claim 2, characterized in that: An annular positioning steel plate (12) is provided on the frame steel pipe column (1) and located at the lower side of the semicircular ring plate (3). The annular positioning steel plate (12) is used to press against the semicircular ring plate (3) from bottom to top to play an anti-pullout role.

7. The substation frame steel pipe column insertion foundation according to claim 6, characterized in that: An inner transverse partition plate (4) corresponding to the position of the semicircular ring plate (3) is provided inside the frame steel pipe column (1).

8. The transformer substation steel pipe column insertion foundation according to claim 7, characterized in that: The thickness of the inner transverse partition plate (4) is not less than the thickness of the semicircular ring plate (3).

9. The transformer substation frame steel pipe column insertion foundation according to claim 1 or 8, characterized in that: The inner wall of the cup mouth (21) is roughened, and the surface of the frame steel pipe column (1) located inside the cup mouth (21) is provided with equally distributed shear studs (6) and welded steel bar rings (7).

10. The substation frame steel pipe column insertion foundation according to claim 9, characterized in that: The spacing between adjacent welded steel bar rings (7) is set to 100-200 mm; The shear bolts (6) are arranged vertically with respect to the axis of the frame steel pipe column (1), and a plurality of the shear bolts (6) are evenly distributed along the surface of the frame steel pipe column (1) at an angle of 15°-45°.

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