Transformer substation fire-resistant shell structure with template function and assembling method of transformer substation fire-resistant shell structure

Abstract

The invention discloses a transformer substation fire-resistant shell structure with a template function and an assembling method thereof, and relates to the technical field of constructional engineering, the transformer substation fire-resistant shell structure comprises a bottom plate and a [-shaped side plate arranged on the bottom plate, the [-shaped side plate is formed by mutually splicing three outer templates, each outer template is detachably connected with the bottom plate, and each outer template is detachably connected with the bottom plate. The bottom plate and the outer formworks are made of strain hardening cement-based composite materials, a concrete wall plate is formed on the inner side of each outer formwork in a pouring mode, and the concrete wall plates and the outer formworks form a composite integral structure. The fireproof performance and the mechanical performance of the transformer substation shell structure can be remarkably improved, and meanwhile the construction efficiency and the economical efficiency are both improved.

Description

Technical Field

[0001] This application relates to the technical field of construction engineering, and particularly to a fire-resistant outer shell structure of a substation with formwork function and its assembly method. Background Art

[0002] In the construction process of modern substations, the design of the substation outer shell structure plays a crucial role, which is directly related to core elements such as the safety, durability, and construction efficiency of equipment.

[0003] Traditional substation outer shells mostly adopt monolithic cast reinforced concrete structures. In terms of construction, the construction period of this structure is extremely long. Each construction requires a large amount of formwork erection work, and the process of formwork disassembly and assembly is extremely cumbersome, consuming a large amount of labor, material, and time costs. In terms of performance, its fire resistance performance is significantly insufficient. In case of accidents such as fires, it is difficult to effectively protect the key equipment and lines inside the substation, easily triggering serious power accidents, causing huge economic losses and social impacts. Therefore, it is no longer able to meet the urgent needs of modern substations for safe and efficient construction and operation.

[0004] To solve the drawbacks of traditional substation outer shells, prefabricated substation outer shell structures have emerged and have been applied to substation engineering construction. This structure realizes the rapid fixation and disassembly of substation boxes of different sizes through fixed frames and adjusting screws, improving the construction efficiency to a certain extent and meeting some requirements for construction convenience. However, there are limitations in the material selection of this structure. Its components are mostly made of metal or traditional composite materials. Metal materials are prone to corrosion under the influence of environmental factors during long-term use, reducing the durability of the outer shell; traditional composite materials perform poorly in fire resistance and cannot provide reliable fire protection for substations. Moreover, when these two materials work together with the internal structure of the substation, the overall stability is insufficient and it is difficult to cope with complex and changeable operating conditions. Therefore, they still cannot fully meet the needs of modern substations for safe and efficient construction and operation. For this reason, the present invention proposes a fire-resistant outer shell structure of a substation with formwork function and its assembly method. Summary of the Invention

[0005] The embodiments of this application provide a fire-resistant outer shell structure of a substation with formwork function and its assembly method, which can significantly improve the fire resistance and mechanical properties of the substation outer shell structure, while taking into account the improvement of construction efficiency and economy.

[0006] The first aspect of this application provides a fire-resistant outer shell structure of a substation with formwork function, including: a bottom plate and a "C"-shaped side plate arranged on the bottom plate;

[0007] The "C"-shaped side plate is composed of three outer formworks spliced together;

[0008] Each of the outer templates is detachably connected to the base plate;

[0009] The base plate and the outer formwork are both made of strain-hardening cement-based composite materials;

[0010] The inner side of each outer formwork is cast to form a concrete wall panel;

[0011] The concrete wall panel and the outer formwork form a composite integral structure.

[0012] Optionally, a beam structure is provided between two opposite concrete wall panels.

[0013] Optionally, a fixing slot for mounting the outer template is provided on the upper surface of the base plate;

[0014] The number of the fixing slots is equal to the number of the outer templates and corresponds one to one.

[0015] Optionally, a tenon matched with the fixing slot is provided at the bottom of the outer template;

[0016] The outer template is connected to the bottom plate through the tenon.

[0017] Optionally, two adjacent outer formworks are spliced ​​together via a mortise and tenon connection structure.

[0018] Optionally, the mortise and tenon connection structure includes a mortise and tenon joint.

[0019] Optionally, the inner surface of the outer template is roughened to a roughness of 1-2 mm.

[0020] Optionally, the thickness of the outer template and the bottom plate are both 30-50 mm;

[0021] The thickness of the concrete wall panel is 100-150 mm.

[0022] The second aspect of the present application provides a method for assembling a fire-resistant shell structure of a substation with a template function as described above, the method specifically comprising the following steps:

[0023] S1, using strain hardening cement-based composite material to prefabricate the base plate and outer formwork;

[0024] S2, roughening the inner surface of the outer template with a steel brush and cleaning the surface dust;

[0025] S3, assemble the base plate and outer formwork on site and fix them through mortise and tenon joints;

[0026] S4. Install the inner formwork and fix the support;

[0027] S5. Pour concrete between the inner formwork and the outer formwork, and pour the beam structure between the completed concrete wall panels.

[0028] S6. After the concrete begins to set, remove the inner formwork and retain the outer formwork as the permanent outer shell of the substation.

[0029] Optionally, in step S3, when assembling by tenon-mortise connection, supplement the cement-based material inside the mortise joint, and use a knocking or tensioning device to ensure a tight joint.

[0030] As can be seen from the above technical solutions, the embodiments of the present application have the following advantages: The fire-resistant outer shell structure of this substation is made of strain-hardening cement-based composite material for the bottom plate and the outer formwork, which has excellent fire resistance, can significantly improve the fire resistance of the substation outer shell. Moreover, the outer formwork combines the functions of formwork and permanent outer shell, can eliminate the disassembly process of the traditional outer formwork, realize rapid assembly, greatly shorten the construction period, and reduce labor and time costs. Description of the Drawings

[0031] Figure 1 It is a schematic structural diagram of the fire-resistant outer shell structure of the substation with formwork function in the embodiment of the present application;

[0032] Figure 2 It is a schematic structural diagram of the outer formwork in the embodiment of the present application;

[0033] Figure 3 It is a schematic structural diagram of the "C"-shaped side plate in the embodiment of the present application;

[0034] Figure 4 It is a top view of the "C"-shaped side plate in the embodiment of the present application;

[0035] Figure 5 It is an enlarged detail view of the tenon-mortise connection structure in the embodiment of the present application;

[0036] Figure 6 It is an installation schematic diagram of the inner formwork in the embodiment of the present application;

[0037] Figure 7 It is a flowchart of the assembly method of the fire-resistant outer shell structure of the substation with formwork function in the embodiment of the present application;

[0038] Among them, the reference numerals are:

[0039] 1 - bottom plate, 2 - outer formwork, 3 - concrete wall panel, 4 - beam structure, 5 - tenon-mortise connection structure, 51 - tenon joint, 52 - mortise joint, 6 - inner formwork. Detailed Embodiments

[0040] To enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solution in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0041] In the description of this application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0042] Unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0043] This application provides an embodiment of a substation fire-resistant outer shell structure with a formwork function. For details, please refer to Figures 1 to 3 .

[0044] The substation fire-resistant outer shell structure with a formwork function in this embodiment includes: a bottom plate 1 and a "C"-shaped side plate arranged on the bottom plate 1. The "C"-shaped side plate is composed of three outer formworks 2 spliced together. Each outer formwork 2 is detachably connected to the bottom plate 1. Both the bottom plate 1 and the outer formworks 2 are made of strain-hardening cementitious composite material (SHCC). A concrete wall panel 3 is cast on the inner side of each outer formwork 2, and the concrete wall panel 3 and the outer formwork 2 form a composite integral structure.

[0045] It should be noted that: by using strain-hardening cementitious composite material (SHCC) to make the bottom plate 1 and the outer formworks 2, this substation fire-resistant outer shell structure has excellent fire resistance, can significantly improve the fire resistance of the substation outer shell. Moreover, the outer formwork 2 has both the formwork function and the permanent outer shell function, which can eliminate the disassembly process of the traditional outer formwork 2, realize rapid assembly, greatly shorten the construction period, and reduce the labor and time costs.

[0046] The above is the first embodiment of a substation fire-resistant outer shell structure with a template function provided by the embodiments of the present application. The following is the second embodiment of a substation fire-resistant outer shell structure with a template function provided by the embodiments of the present application. For details, please refer to Figures 1 to 6 .

[0047] The substation fire-resistant outer shell structure with a template function in this embodiment includes: a bottom plate 1 and a "C"-shaped side plate arranged on the bottom plate 1. The "C"-shaped side plate is composed of three outer templates 2 spliced together. Each outer template 2 is detachably connected to the bottom plate 1. The bottom plate 1 and the outer templates 2 are both made of strain-hardening cement-based composite material (SHCC). A concrete wall panel 3 is cast on the inner side of each outer template 2. The concrete wall panel 3 and the outer template 2 form a composite integral structure.

[0048] A beam structure 4 is arranged between two opposite concrete wall panels 3. Specifically, the beam structure 4 can be integrally cast between two opposite concrete wall panels 3.

[0049] The upper surface of the bottom plate 1 is provided with fixing slots for installing the outer templates 2, so as to facilitate the later assembly and fixation; the number of the fixing slots is equal to the number of the outer templates 2 and they correspond one by one.

[0050] The bottom of the outer template 2 is provided with tenons adapted to the fixing slots, and the outer template 2 is connected to the bottom plate 1 by mortise and tenon joints.

[0051] Two adjacent outer templates 2 are spliced through a mortise and tenon connection structure 5. The mortise and tenon connection structure 5 includes a tenon joint 51 and a mortise joint 52. Specifically, the left and right ends of the outer template 2 can be integrally formed with a tenon joint 51 or a mortise joint 52 as required.

[0052] The inner surface of the outer template 2 is roughened by a steel brush, and the roughness is 1-2 mm. It can be understood that corresponding gap structures should be reserved during the steel brush roughening treatment of the outer template 2 for assembly, and the reserved structural gap should be 1-2 mm.

[0053] The thicknesses of the outer template 2 and the bottom plate 1 can both be 30-50 mm; the thickness of the concrete wall panel 3 can be 100-150 mm.

[0054] As Figure 7 shown, the present application also provides an assembly method for the substation fire-resistant outer shell structure with a template function as described above. The method specifically includes the following steps:

[0055] S1. Prefabricate the bottom plate 1 and the outer templates 2 with strain-hardening cement-based composite material, and simultaneously fabricate corresponding inner templates 6;

[0056] S2. Roughen the inner surface of the outer template 2 with a steel brush and clean the surface dust;

[0057] S3, assembling the base plate 1 and the outer formwork 2 on site and fixing them by mortise and tenon joints;

[0058] S4, install the inner formwork 6 and fix the support;

[0059] S5, pouring concrete between the inner formwork 6 and the outer formwork 2, and pouring the beam structure 4 between the poured concrete wall panels 3;

[0060] S6. After the concrete has initially set, it is cured and the inner formwork 6 is removed, leaving the outer formwork 2 as the permanent shell of the substation.

[0061] In step S3, when the mortise and tenon joints are assembled, cement-based materials are added to the inner side of the mortise and tenon joints 52, and a knocking or tensioning device is used to ensure that the joints are tight.

[0062] In step S2, the surface is cleaned by using an air pump or a brush to remove loose particles to ensure a clean interface to facilitate subsequent interface bonding.

[0063] In step S4, the inner template 6 may be a lightweight steel template or a wooden template, the verticality and flatness of which may be fixed by a support system.

[0064] In the specific implementation, taking the typical substation shell project as an example, strain hardening cement-based composite material (SHCC) is used to make the substation fire-resistant shell structure with template function. The structure mainly includes an SHCC bottom plate 1 and three SHCC outer templates 2, and the four pieces are assembled together to form the basic outer contour of the shell. In this process, the outer template 2 is 50mm thick and is reliably assembled through the mortise and tenon connection structure 5. After the inner side is roughened by steel brush, ordinary concrete wall panels 3 and beam structures 4 with a thickness of 100-150mm are poured inside, thereby achieving improved fire resistance and integrated construction.

[0065] Specifically, according to the design dimensions and drawing requirements of the substation shell, the base plate 1 and three outer formworks 2 are first made in the factory using SHCC mixture. As a new type of high-performance fiber-reinforced cement-based composite material, SHCC has excellent tensile and compressive strength, ductility and fire resistance, which can significantly improve the mechanical properties and fire resistance of the substation shell structure. The thickness of the outer formwork 2 and the base plate 1 are controlled within 50mm to ensure the rigidity and lightweight characteristics of the outer formwork 2 and the base plate 1. After reaching the predetermined strength through standard maintenance, the outer formwork 2 and the base plate 1 are transported to the construction site.

[0066] Before the outer formwork 2 and the bottom plate 1 leave the factory, the docking edges of the outer formwork 2 and the bottom plate 1 have been processed with mortise and tenon connection components according to the design, ensuring that they can be quickly assembled on-site without additional welding or bolt connection, and obtaining high connection strength and stability. By adopting the mortise and tenon connection method, it can provide sufficient shear and tensile resistance under external forces and allow slight deformation to a certain extent, thereby improving the overall mechanical properties.

[0067] After the outer formwork 2 and the bottom plate 1 have initially set, the inner surfaces are roughened with a steel brush to form a uniform roughness of 1-2 mm on the surface. This roughness is beneficial to forming a good bonding interface with ordinary concrete subsequently, thereby improving the integrity and durability of the overall structure. After the roughening treatment is completed, the inner surface of the formwork is cleaned with an air pump or a soft brush to ensure that there is no residual loose particles and floating dust, providing a clean surface for the subsequent pouring of ordinary concrete.

[0068] During the actual construction process, first, the bottom plate 1 is laid on the completed foundation or cushion and preliminarily fixed. Subsequently, the three outer formworks 2 are assembled and docked on the bottom plate 1 through mortise and tenon connections. During the process of inserting the tenon joint 51 into the mortise joint 52, an appropriate amount of cement-based material is applied to the inner side of the mortise joint 52, and slight tapping or a tensioning device is used to ensure that the connection is tight, without obvious misalignment and gaps. The "C"-shaped side plate formed after the assembly of the outer formwork 2 is as Figure 3 shown.

[0069] By adopting the above-mentioned assembly method of mortise and tenon connection, not only can the installation time of the outer formwork 2 be effectively shortened, but it can also withstand the corresponding lateral pressure during the subsequent concrete pouring, maintaining the overall shape stable, thus avoiding the cumbersome process of requiring a large number of external support frames and reinforcement members in traditional formwork construction.

[0070] After the overall assembly of the outer formwork 2 and the bottom plate 1 is completed and ensured to be stable, the inner formwork 6 is installed at a position relative to the outer formwork 2 inside the shell. The inner formwork 6 can be made of lightweight steel formwork or wooden formwork, and is used to define the final thickness and shape of the subsequent concrete wall panel 3 and beam structure 4 (in this embodiment, the thickness of the concrete wall panel 3 is required to be 100-150 mm). It is firmly fixed at the predetermined position through the support system of the inner formwork 6 (such as back ribs, diagonal braces, etc.), and the verticality and flatness of the inner formwork 6 are ensured.

[0071] After the construction of the inner and outer formwork systems is completed, the concrete pouring work can be carried out. The concrete mixture is poured into the cavity formed between the outer formwork 2 and the inner formwork 6. At this time, the roughened inner surface of the outer formwork 2 is in full contact with the newly poured concrete. Through vibration, the concrete is filled densely and a good bonding force is obtained at the interface.

[0072] After the concrete wall slab 3 is poured, a concrete beam structure 4 is poured in the upper area according to the design requirements (if necessary, a separate beam segment inner mold can be supported) so that the beam structure 4 and the concrete wall slab 3 form an integral force-bearing unit. After the vibration is completed, the poured concrete is subjected to initial setting and curing to ensure that it reaches the initial strength requirements.

[0073] After the concrete reaches the required initial setting and early strength, the inner formwork 6 and related support system are carefully removed. At this time, the outer formwork 2 will continue to be retained due to its permanent characteristics and become the outer structure of the substation shell. At the same time, the outer formwork 2 and the concrete wall panel 3 inside it have formed an integral structure, and the reliable bonding between the two at the interface significantly improves the overall stiffness and bearing performance.

[0074] After standard maintenance and necessary quality inspection, an integrated SHCC-concrete composite shell structure can be obtained. This structure has excellent fire resistance, high structural stability and durability, and simplifies the construction process and shortens the construction period, providing an innovative technical path for the construction of substation shells.

[0075] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A fire-resistant shell structure of a substation with a template function, characterized in that: Including: A bottom plate and a "C"-shaped side plate arranged on the bottom plate; The "C"-shaped side plate is composed of three outer templates spliced together; Each of the outer templates is detachably connected to the bottom plate; Both the bottom plate and the outer templates are made of strain-hardening cementitious composite materials; A concrete wall panel is cast on the inner side of each outer template; The concrete wall panel and the outer template form a composite integral structure.

2. The fire-resistant shell structure of a substation with a template function according to claim 1 is characterized in that: A beam structure is arranged between two opposite concrete wall panels.

3. The fire-resistant shell structure of a substation with a template function according to claim 1 is characterized in that: A fixing slot for installing the outer template is formed on the upper surface of the bottom plate; The number of the fixing slots is equal to the number of the outer templates and they are in one-to-one correspondence.

4. The fire-resistant shell structure of a substation with a template function according to claim 3 is characterized in that: A tenon is arranged at the bottom of the outer template and is adapted to the fixing slot; The outer template is connected to the bottom plate by mortise and tenon through the tenon.

5. The fire-resistant shell structure of a substation with a template function according to claim 1, characterized in that: Adjacent two outer templates are spliced through a mortise and tenon connection structure.

6. The fire-resistant shell structure of a substation with a template function according to claim 5, characterized in that: The mortise and tenon connection structure includes a tenon joint and a mortise joint.

7. The fire-resistant shell structure of a substation with a template function according to claim 1, characterized in that: The inner surface of the outer template is roughened, and the roughness is 1-2 mm.

8. The fire-resistant shell structure of a substation with a template function according to claim 1, characterized in that: The thicknesses of both the outer template and the bottom plate are 30-50 mm; The thickness of the concrete wall panel is 100-150 mm.

9. A method for assembling a fire-resistant shell structure of a substation with a template function according to any one of claims 1 to 8, characterized in that: The method specifically includes the following steps: S1. Precast the bottom plate and the outer templates by using strain-hardening cementitious composite materials; S2. Carry out roughening treatment on the inner surface of the outer template with a steel brush and clean the surface dust; S3. Assemble the bottom plate and the outer templates on site and fix them by mortise and tenon connection; S4. Install the inner template and fix the support; S5. Pour concrete between the inner template and the outer template, and pour a beam structure between the completed concrete wall panels; S6. Remove the inner template after the concrete begins to set, and keep the outer template as the permanent shell of the substation.

10. The method for assembling a fire-resistant shell structure of a substation with a template function according to claim 9, characterized in that: In step S3, when assembling by mortise and tenon connection, supplement the cementitious material inside the mortise joint, and use a knocking or tensioning device to ensure the tightness of the joint.

Images