A construction method for main transformer cavity foundation

Abstract

The present invention discloses a main transformer cavity foundation construction method and a main transformer cavity foundation, belonging to the technical field of main transformer foundations. The invention provides a main transformer cavity foundation with a reusable inner membrane and a construction method. The main transformer cavity foundation with a reusable inner membrane comprises a base plate, a cavity foundation, and a reusable shrinkable inner membrane. The cavity foundation is cast on-site on the base plate. A cavity inner membrane mounting hole is reserved on the top of the cavity foundation, through which the reusable shrinkable inner membrane enters the cavity foundation. After the reusable shrinkable inner membrane is unfolded and placed in a set position, the unfolded reusable shrinkable inner membrane is used to be inflated to the base plate position.

Description

Technical Field

[0001] The present invention belongs to the technical field of main transformer foundations, and in particular relates to a main transformer cavity foundation construction method and a main transformer cavity foundation. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Currently, most designs for main transformer foundations rely on cast-in-place concrete. However, due to the transformer's external dimensions, the foundation's cross-section is relatively large, constrained by the size of the transformer itself. This creates significant challenges for on-site construction, necessitating strict construction techniques and quality.

[0004] During the construction of large-volume concrete, problems such as hydration heat and cracks are easily generated, which have always been common problems in large-volume concrete foundations. In addition, the use of conventional solid main transformer foundations consumes a large amount of concrete and requires a lot of on-site wet work. Summary of the Invention

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a main transformer cavity foundation with a reusable inner membrane and a construction method. Under the premise of ensuring reasonable force on the foundation, the cavity is set in the solid foundation to reduce the cross-sectional size of the foundation and avoid the appearance of large-volume concrete. By setting a reusable shrinkage inner membrane, the formwork in the cavity can be quickly constructed and dismantled, thereby reducing the amount of on-site concrete pouring, saving materials and improving quality.

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

[0007] A first aspect of the present invention provides a main transformer cavity foundation construction method.

[0008] A main transformer cavity foundation construction method, comprising:

[0009] Determine the current basic cavity size based on the main transformers of different voltage levels;

[0010] After the foundation reinforcement is tied, several structural reinforcements are arranged around the cavity of determined size;

[0011] Select the inner membrane that matches the current cavity size as the cavity inner membrane;

[0012] An isolation membrane is provided on the outside of the cavity inner membrane to isolate the cavity inner membrane from the poured concrete, so as to facilitate the removal and reuse of the cavity inner membrane;

[0013] Install the cavity inner membrane at the reserved hole on the top of the cavity foundation. After the cavity inner membrane is unfolded inside the cavity foundation and reaches the position of the structural reinforcement, inflate the cavity inner membrane until it reaches the bottom of the cavity foundation.

[0014] When the cavity lining is placed, the cavity foundation is poured with integral concrete;

[0015] After the concrete is completely solidified, the cavity inner membrane is shrunk and then pulled out from the reserved hole at the top.

[0016] As an embodiment, the main transformer cavity foundation construction method further includes:

[0017] After extracting the inner membrane, place the prefabricated pipe into the foundation, pour micro-expansive concrete into the pipe to the upper surface of the foundation, and wait for solidification.

[0018] As an embodiment, the pipe size is equal to the hole size, and the pipe height is higher than the distance from the cavity bottom to the inner surface of the foundation.

[0019] As an embodiment, the inner membrane is inflated through an inflation tube.

[0020] As an embodiment, the main transformer cavity foundation is placed on a bottom plate.

[0021] As an embodiment, the size of the base plate is determined by the load of the main transformer.

[0022] As an embodiment, the inner membrane is connected to an umbrella-shaped structure, and the umbrella-shaped structure is used to achieve the expansion and contraction of the inner membrane.

[0023] As an implementation method, main transformers of different voltage levels are all provided with modular cavity bases of universal size.

[0024] As an embodiment, a structural reinforcement is provided at each corner of the dimensional cavity.

[0025] A second aspect of the present invention provides a main transformer cavity foundation.

[0026] A main transformer cavity foundation is prepared using the main transformer cavity foundation construction method as described above.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] During the construction of the main transformer cavity foundation, the present invention determines the current cavity foundation size, selects an inner membrane that matches the current cavity size, and arranges an isolation membrane on the outside of the inner membrane, so that the cavity inner membrane can be isolated from the poured concrete, which facilitates the removal and reuse of the cavity inner membrane. The cavity inner membrane is then installed at the reserved opening on the top of the cavity foundation, and the inner mold is pulled out by shrinking the inner membrane, thereby forming a cavity inside the box-type foundation to become an empty box foundation. In this way, the empty box foundation can reduce the use of concrete while meeting the bearing capacity, avoid the occurrence of large-volume concrete, and reduce carbon emissions.

[0029] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which constitute a part of the present invention, 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 improper limitations on the present invention.

[0031] Figure 1 is a plan view of a main transformer cavity foundation according to an embodiment of the present invention;

[0032] Figure 2 is the aa cross section of the main transformer cavity foundation of the embodiment of the present invention;

[0033] Figure 3 bb is the cross section of the main transformer cavity foundation according to the embodiment of the present invention.

[0034] Among them, 1. Pipeline, 2. Internal cavity of foundation, 3. Concrete foundation, 4. Steel plate, 5. First reinforcing steel bar, 6. Reserved holes, 7. Bottom plate, 8. Second reinforcing bar. DETAILED DESCRIPTION

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0037] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0038] In one or more embodiments, a main transformer cavity foundation construction method is provided, which specifically includes the following steps:

[0039] Step 1: Determine the current basic cavity size based on the main transformer of different voltage levels;

[0040] Among them, main transformers of different voltage levels are all equipped with modular universal size cavity foundations.

[0041] For example: the dimensions of a dry-type transformer with a rated capacity of 400kVA are: 1360cm*760cm*1300cm;

[0042] The dimensions of a dry-type transformer with a rated capacity of 500kVA are: 1410cm*760cm*1350cm;

[0043] The dimensions of a dry-type transformer with a rated capacity of 1000kVA are: 1600cm*920cm*1520cm.

[0044] Step 2: After the foundation reinforcement is tied, arrange several structural reinforcements around the cavity with a determined size; for example, one structural reinforcement is set at each corner of the cavity.

[0045] It should be noted that the structural reinforcement can be set to a rectangular shape.

[0046] Step 3: Select an inner membrane that matches the current cavity size as the cavity inner membrane.

[0047] In this embodiment, the inner membrane is connected to the umbrella-shaped structure, and the umbrella-shaped structure is used to achieve the expansion and contraction of the inner membrane. The inner membrane expands and contracts along with the expansion and contraction of the umbrella-shaped structure, and the inner membrane is directly connected to the umbrella-shaped structure.

[0048] Step 4: An isolation membrane is provided on the outside of the cavity inner membrane to isolate the cavity inner membrane from the poured concrete, so as to facilitate the removal and reuse of the cavity inner membrane.

[0049] This ensures that after the concrete solidifies, the cavity inner membrane will not adhere to the concrete when the formwork is removed.

[0050] In this embodiment, the isolation membrane may be implemented by a plastic film. It should be understood that those skilled in the art may also use other materials to prepare the isolation membrane.

[0051] The inner membrane can be realized by canvas, etc., which will not be described in detail here.

[0052] Step 5: Install the cavity inner membrane at the reserved hole on the top of the cavity foundation. After the cavity inner membrane is unfolded inside the cavity foundation and reaches the position of the structural steel bars, inflate the cavity inner membrane so that the cavity inner membrane reaches the bottom of the cavity foundation.

[0053] In a specific implementation process, the inner membrane is inflated through an inflation tube, so that the retractable inner membrane reaches the bottom of the cavity base by air pressure.

[0054] Step 6: After the cavity lining is placed, the cavity foundation is poured with integral concrete.

[0055] Step 7: After the concrete is completely solidified, shrink the cavity inner membrane and pull it out from the reserved hole at the top.

[0056] In some specific implementations, the main transformer cavity foundation construction method further includes:

[0057] After removing the inner membrane, the prefabricated pipe is placed into the foundation. Micro-expansive concrete is poured into the pipe to the upper surface of the foundation and allowed to solidify. This seals the opening after consolidation and forms a single unit with the surrounding foundation. The columns formed by the lower pouring also increase the bearing capacity and make the foundation more stable.

[0058] The pipe size is equal to the hole size, and the pipe height is higher than the distance from the bottom of the cavity to the inner surface of the foundation.

[0059] In a specific implementation process, the main transformer cavity foundation is placed on a base plate, wherein the size of the base plate is determined by the load of the main transformer.

[0060] In one or more embodiments, a main transformer cavity foundation is further provided. The main transformer cavity foundation is prepared using the main transformer cavity foundation construction method as described above.

[0061] according to Figure 1-Figure 3 The main transformer cavity foundation of this embodiment includes a bottom plate 7 and a concrete foundation 3 arranged on the bottom plate 7, wherein the concrete foundation 3 has an internal cavity 2, a pipeline 1 is further arranged on the concrete foundation 3, a reserved hole 6 is further provided on the top of the concrete foundation 3, a steel plate 4 is arranged on the concrete foundation 3, a first reinforcing steel bar 5 is further embedded in the concrete foundation 3, and a second reinforcing bar 8 is embedded in the bottom plate 7.

[0062] In this embodiment, the baseplate is a reinforced concrete baseplate, cast on-site by the construction company. The baseplate dimensions are determined based on the load of the main transformer through calculation and analysis. The cavity foundation above the baseplate is also cast on-site by the construction company. The foundation and cavity dimensions are determined based on the design calculation and analysis results.

[0063] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A main transformer cavity foundation construction method, characterized in that: include: Determine the current basic cavity size based on the main transformers of different voltage levels; After the foundation reinforcement is tied, several structural reinforcements are arranged around the cavity of determined size; An inner membrane that matches the current cavity size is selected as the cavity inner membrane; the inner membrane is connected to an umbrella-shaped structure, and the umbrella-shaped structure is used to achieve expansion and contraction of the inner membrane; An isolation membrane is provided on the outside of the cavity inner membrane to isolate the cavity inner membrane from the poured concrete, so as to facilitate the removal and reuse of the cavity inner membrane; Install the cavity inner membrane at the reserved hole on the top of the cavity foundation. After the cavity inner membrane is unfolded inside the cavity foundation and reaches the position of the structural reinforcement, inflate the cavity inner membrane until it reaches the bottom of the cavity foundation. When the cavity lining is placed, the cavity foundation is poured with integral concrete; After the concrete is completely solidified, shrink the cavity inner membrane and pull it out from the reserved hole at the top; After extracting the inner membrane, place the prefabricated pipe into the foundation, pour micro-expansive concrete into the pipe to the upper surface of the foundation, and wait for solidification.

2. The main transformer cavity foundation construction method according to claim 1, characterized in that: The pipe size is equal to the hole size, and the pipe height is higher than the distance from the bottom of the cavity to the inner surface of the foundation.

3. The main transformer cavity foundation construction method according to claim 1, characterized in that: The inner membrane is inflated through the inflation tube.

4. The main transformer cavity foundation construction method according to claim 1, characterized in that: The main transformer cavity foundation is placed on the bottom plate.

5. The main transformer cavity foundation construction method according to claim 4, characterized in that: The size of the base plate is determined by the load of the main transformer.

6. The main transformer cavity foundation construction method according to claim 1, characterized in that: Main transformers of different voltage levels are all equipped with modular cavity bases of universal sizes.

7. The main transformer cavity foundation construction method according to claim 1, characterized in that: A structural reinforcement is provided at each corner of the dimensioned cavity.

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