Emergency accident pit for vacuum degassing furnace and construction method thereof

Abstract

The invention relates to the technical field of steelmaking production, in particular to an emergency accident pit for a vacuum degassing furnace and a construction method of the emergency accident pit. The emergency accident pit comprises a pit body which is provided with a cylindrical containing cavity with the top open; the bottom wall module is laid on the bottom surface of the cylindrical accommodating cavity; the side wall module is attached to the inner side face of the cylindrical containing cavity, and the side wall module extends upwards from the bottom wall module; the bottom wall module comprises prefabricated blocks and filling blocks, the multiple prefabricated blocks are flatly laid on the bottom face of the cylindrical containing cavity, a gap is formed between any two adjacent prefabricated blocks, and the filling blocks are embedded in the gaps and used for connecting the adjacent prefabricated blocks. In the invention, the bottom wall module is formed by splicing the precast blocks and the filling blocks, and the masonry is completed by paving the precast blocks first and then pouring the filling blocks, so that the surface of the emergency accident pit has higher flatness, the integrity of the emergency accident pit can be improved, and the thermal insulation performance of the emergency accident pit can also be improved.

Description

Technical Field

[0001] This invention relates to the field of steelmaking production technology, and in particular to an emergency accident pit for a vacuum degassing furnace and its construction method. Background Technology

[0002] In the steel smelting process, to cope with unexpected accidents such as molten steel leaks, backup emergency pits are needed to hold the spilled molten steel. Existing emergency pits are typically constructed using refractory bricks. While this construction method is technically mature, it has several problems in practical application: the flatness between the refractory bricks at the bottom is not high, making slag removal difficult; the overall integrity of the refractory brickwork is poor, and the adhesion between the refractory bricks and concrete is not high, leading to refractory brick peeling during later slag removal, which affects the service life of the emergency pit; gaps exist between the refractory bricks and the concrete support platform, affecting thermal insulation performance.

[0003] In addition, the accident crater can be constructed quickly using integral casting technology. Due to the lack of dedicated baking equipment capable of providing gradient baking conditions, the residual heat of the hot ladle shell, which had just come off the production line, was used for on-site thermal radiation baking. However, frequent replacement of the hot ladle shell prevented the provision of effective gradient baking conditions. The low thermal radiation temperature of the hot ladle shell, combined with an excessively thick bottom refractory layer, led to incomplete drying of the refractory, potentially causing safety hazards during later use. Furthermore, the alternating hot and cold temperatures during ladle shell replacement could easily cause the refractory to crack during the baking process. Summary of the Invention

[0004] This invention aims to solve the technical problems existing in related technologies. To this end, this invention proposes an emergency accident pit for a vacuum degassing furnace and its construction method, to solve the defects of existing emergency accident pits, such as difficulty in slag removal, short service life, poor thermal insulation performance, and easy cracking of castable during construction.

[0005] The first invention provides an emergency accident pit for a vacuum degassing furnace, comprising: A pit body having a cylindrical cavity with an open top; The bottom wall module is laid on the bottom surface of the cylindrical cavity; A sidewall module is attached to the inner surface of the cylindrical cavity, and the sidewall module extends upward from the bottom wall module; The bottom wall module includes prefabricated blocks and filling blocks. Several prefabricated blocks are laid flat on the bottom surface of the cylindrical cavity and there are gaps between any adjacent prefabricated blocks. The filling blocks are embedded in the gaps to connect adjacent prefabricated blocks.

[0006] According to the present invention, an emergency accident pit for a vacuum degassing furnace is provided, wherein the precast block is provided with a wedge-shaped portion extending along its plate edge, and the sharp edge of the wedge-shaped portion is centrally disposed between two plates of the precast block, such that the gap width between adjacent precast blocks varies with the oblique side surface of the wedge-shaped portion.

[0007] An emergency pit for a vacuum degassing furnace according to the present invention further includes: A concrete platform, which is connected to the inner side of the cylindrical cavity and is higher than the sidewall module, and four concrete platforms are symmetrically distributed in pairs along the circumference of the cylindrical cavity. A ladle support frame, with its two ends connected to the concrete platform, and two ladle support frames arranged in parallel at intervals to support the molten steel ladle.

[0008] According to the present invention, an emergency accident pit for a vacuum degassing furnace is provided, wherein the top of the side wall module is provided with an inclined surface, and the angle between the inclined surface and the horizontal plane is 45°.

[0009] According to the present invention, an emergency accident pit for a vacuum degassing furnace is provided, wherein the filling block is made of high-alumina or aluminum-magnesium explosion-proof castable.

[0010] According to the present invention, an emergency accident pit for a vacuum degassing furnace is provided, wherein the sidewall module is made of high-alumina or aluminum-magnesium explosion-proof castable.

[0011] Secondly, the present invention also provides a construction method for an emergency accident pit, used in any of the above-described emergency accident pits for a vacuum degassing furnace, comprising: Assemble the bottom wall modules inside the pit; The side wall modules were poured using an integral formwork casting method.

[0012] According to a construction method for an emergency accident pit provided by the present invention, the step of assembling bottom wall modules within the pit includes: Precast blocks are laid on the bottom surface of the pit, and explosion-proof castable is filled into the gaps between adjacent precast blocks to form filling blocks, connecting the precast blocks into a whole.

[0013] According to a construction method for an emergency accident pit provided by the present invention, the step of laying precast blocks on the bottom surface of the pit includes: Precast blocks are prepared by baking in the workshop, then hoisted to the bottom of the pit, laid out, and gaps are left between adjacent blocks.

[0014] According to a construction method for an emergency accident pit provided by the present invention, the sidewall modules are poured using an integral formwork casting method, comprising: Along the direction of the pit sidewall, an inner lining template is erected on the bottom wall module to form a cavity with a consistent spacing between the inner lining template and the side of the pit. Explosion-proof castable is then poured into the cavity.

[0015] The above-described one or more technical solutions of this invention have at least one of the following technical effects: The bottom wall module is composed of precast blocks and filling blocks. The construction is completed by laying the precast blocks first and then pouring the filling blocks. This gives the surface of the emergency accident pit a high degree of flatness, which facilitates the cleaning of debris by the staff, reduces the labor intensity of the staff, and improves efficiency. It can improve both the overall integrity of the emergency accident pit and its thermal insulation performance.

[0016] In addition to the technical problems solved by the present invention, the technical features of the technical solutions constituted by the present invention, and the advantages brought about by the technical features of these technical solutions as described above, other technical features of the present invention and the advantages brought about by these technical features will be further explained in conjunction with the accompanying drawings, or will be learned through the practice of the present invention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of an emergency accident pit provided in an embodiment of the present invention.

[0019] Figure 2 A radial cross-sectional view of an emergency accident pit provided in an embodiment of the present invention.

[0020] Figure 3 This is a top view of an emergency accident pit provided in an embodiment of the present invention.

[0021] Figure 4 for Figure 3 A magnified view of a portion of the bottom wall module.

[0022] Figure 5 This is a schematic diagram of the structure of a prefabricated block provided in an embodiment of the present invention.

[0023] Figure label: 100. Pit body; 200. Bottom wall module; 210. Precast block; 211. Wedge-shaped part; 220. Filling block; 300. Side wall module; 310. Inclined surface; 400. Concrete platform; 500. Steel ladle support frame. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0025] A vacuum degassing furnace, also known as a VD refining furnace, is an important vacuum refining device in the steelmaking process. It treats molten steel under vacuum conditions to remove gases such as hydrogen and nitrogen, and to reduce the content of inclusions, thereby improving the quality of the steel.

[0026] Emergency accident pits are an important safety measure in VD furnace design. Located at the bottom of the vacuum ladle of the VD refining furnace, they are used to collect leaked materials in the event of accidental steel spills or other accidents, preventing environmental pollution or larger safety incidents. Under normal circumstances, the emergency accident pit is unused and only comes into play in emergency situations.

[0027] like Figures 1 to 3 As shown in the embodiments of the present invention, an emergency accident pit for a vacuum degassing furnace is introduced.

[0028] The emergency crater includes a crater body 100, a bottom wall module 200, and side wall modules 300. The crater body 100 has a cylindrical cavity with an open top to contain leaked molten steel. The cross-section of the cylindrical cavity can be rectangular or circular depending on the site layout requirements. The side walls and bottom of the crater body 100 are cast from reinforced concrete, providing sufficient structural strength and stability.

[0029] The bottom wall module 200 is laid on the bottom surface of the cylindrical cavity, forming a high-temperature resistant bottom protective layer to prevent high-temperature molten steel from directly contacting the concrete base of the pit 100. The side wall module 300 is tightly attached to the inner surface of the cylindrical cavity. Furthermore, the side wall module 300 extends upward from the upper surface of the bottom wall module 200 until it reaches the designed height.

[0030] The side wall module 300 and the bottom wall module 200 together form the fire-resistant inner lining structure of the emergency accident pit, providing comprehensive protection for the concrete side walls of the pit body 100.

[0031] The bottom wall module 200 is composed of a filling block 220 and several prefabricated blocks 210. The several prefabricated blocks 210 are evenly and flatly laid on the bottom surface of the cylindrical cavity according to a preset arrangement.

[0032] Furthermore, uniform and continuous gaps are reserved between adjacent precast blocks 210 according to the design dimensions. These gaps serve as filling channels for subsequent castable refractory materials and can also be used to release the stress generated when the refractory lining expands due to heat, thus preventing defects such as cracking, arching, and peeling of the bottom wall module 200 due to thermal expansion and compression.

[0033] The filling block 220 is embedded in the gap between adjacent precast blocks 210 by on-site casting. After baking, it is tightly bonded to the precast blocks 210, connecting all the independent precast blocks 210 into a whole structure, which improves the sealing of the bottom wall module 200 and eliminates the risk of leakage from the splicing gaps.

[0034] In this embodiment, the bottom wall module 200 is composed of precast blocks 210 and filler blocks 220. The construction is completed by first laying the precast blocks 210 and then pouring the filler blocks 220, fundamentally solving the defects of traditional refractory brick masonry techniques: poor flatness, uneven mortar joints, weak integrity, and difficulty in slag removal. The precast blocks 210 are pre-baked and prepared in the factory before being transported to the site for assembly. This avoids the defect of using a one-piece cast bottom wall module 200 where the refractory material cannot be drained during heat radiation baking using the residual heat of the ladle shell. The surface of the precast blocks 210 has high flatness, resulting in a smaller overall flatness error of the assembled bottom wall module 200. This helps reduce the solidification and bonding strength of the steel slag, facilitates rapid cleaning, significantly reduces the labor intensity of operators, and improves the efficiency of slag removal. Simultaneously, the integral bottom wall module 200 can fit tightly and evenly with the concrete base layer, avoiding problems such as hollow areas and gaps, and extending the service life of the emergency pit.

[0035] Based on the above embodiments, in another embodiment of the present invention, the structure of the prefabricated block 210 is further defined.

[0036] like Figure 4 and Figure 5 As shown, the precast block 210 has a plate-like structure, with wedge-shaped portions 211 extending continuously along its circumferential edge. The pointed edge of the wedge-shaped portion 211 is centrally located between the upper and lower surfaces of the precast block 210. That is, the pointed edge is equidistant from the upper and lower surfaces of the precast block 210, forming a symmetrical oblique side structure. When two adjacent precast blocks 210 are joined together, the wedge-shaped portions 211 on their edges cooperate with each other, causing the gap width between them to gradually increase from the pointed edge of the wedge-shaped portion 211 towards the upper and lower surfaces of the precast block 210, ultimately forming a channel with a cross-section of "><". This channel is wide at the top and bottom and narrow in the middle.

[0037] By setting wedge-shaped portions 211 on the edge of the precast block 210, the contact area between the filler block 220 and the precast block 210 can be increased, forming a dual connection of mechanical interlocking and chemical bonding between the filler block 220 and the precast block 210, significantly improving the connection strength between the filler block 220 and the precast block 210. Simultaneously, this gradually widening gap structure facilitates the smooth flow and dense filling of the castable refractory under its own weight and vibration, avoiding defects such as porosity, looseness, and incomplete filling, ensuring that the filler block 220 is uniformly dense overall. Furthermore, the symmetrical placement of the wedge-shaped portions 211 on the edge of the precast block 210 makes the precast block 210 easier to process, eliminating the need to distinguish directions during on-site assembly, reducing construction difficulty, and improving assembly efficiency.

[0038] Based on the above embodiments, another embodiment of the present invention introduces an emergency accident pit for a vacuum degassing furnace.

[0039] The emergency crater also includes a concrete platform 400 and a steel support frame 500. The concrete platform 400 is a reinforced concrete structure and is connected to the side of the crater body 100. The top surface of the concrete platform 400 is higher than the top surface of the side wall module 300, forming a support platform that extends above the side wall module 300.

[0040] The number of concrete platforms 400 is set to four. The four concrete platforms 400 are symmetrically distributed along the circumference of the cylindrical cavity, with balanced stress, strong stability, and able to bear the entire weight of the molten steel ladle and molten steel.

[0041] Two ladle support frames 500 are provided. The two ladle support frames 500 are arranged parallel to each other at intervals. Both ends of the ladle support frame 500 are fixedly connected to symmetrically distributed concrete platforms 400. The connection method can be bolted, welded, or pre-embedded anchoring, ensuring a firm connection without loosening or displacement. The ladle support frames 500 are made of high-temperature resistant steel or heat-resistant cast iron.

[0042] The ladle support frame 500 can stably and reliably support the bottom of the molten steel ladle, keeping it horizontal and stable in the event of an accident, preventing dangerous situations such as tilting, slippage, or overturning, and preventing disorderly splashing and spillage of molten steel. Meanwhile, the symmetrically arranged concrete platform 400 and the parallel-arranged ladle support frame 500 facilitate precise positioning and rapid hoisting of the molten steel ladle, improving operational efficiency.

[0043] Based on the above embodiments, in another embodiment of the present invention, the structure of the sidewall module 300 is further defined.

[0044] During the casting process, the sidewall module 300 has a continuous and smooth inclined surface 310 on its inner top side. The angle between the inclined surface 310 and the horizontal plane is 45°, which gives the sidewall module 300 the triple advantages of preventing slag buildup, easy cleaning, and structural stability.

[0045] When molten steel splashes onto the top of the sidewall module 300, it will smoothly slide down the inclined surface 310 into the emergency accident pit under its own weight, without adhering to, accumulating, or solidifying on the top edge of the sidewall module 300, thus fundamentally preventing slag buildup. Subsequent cleaning only requires simple blowing or tapping to remove residual steel slag, significantly reducing the workload of cleaning the emergency accident pit.

[0046] Furthermore, the material of the filler block 220 can be high-strength, high-alumina explosion-proof castable or aluminum-magnesium explosion-proof castable.

[0047] High-alumina explosion-proof castables, with Al2O3 as the main component, exhibit low high-temperature creep, wear resistance, and resistance to acidic slag corrosion. They are suitable for high-temperature operating environments. Alumina-magnesia explosion-proof castables, by introducing MgO into the high-alumina composition, generate an in-situ aluminum-magnesium spinel phase at high temperatures. This material possesses micro-expansion properties, compensating for shrinkage during high-temperature use, preventing shrinkage cracking, and improving structural density.

[0048] Both types of castables contain special explosion-proof components and heat-resistant fibers. During the heating process, the fibers melt to form uniform and interconnected exhaust channels, which quickly discharge internal free water and crystal water. This effectively prevents cracking and peeling caused by excessive internal pressure due to rapid vaporization of moisture during baking and use, ensuring the structural integrity of the bottom wall module 200.

[0049] The filler block 220 is cast using high-alumina explosion-proof castable or aluminum-magnesium explosion-proof castable, which can bond well with the precast block 210, avoiding cracks and separation caused by expansion at high temperatures. Casting the filler block 220 into the gaps between adjacent precast blocks 210 eliminates the splicing gaps between them, improving the sealing and integrity of the bottom wall module 200 and preventing molten steel from seeping into the concrete base layer along the gaps. It also improves the thermal insulation performance of the bottom wall module 200, effectively blocking the heat transfer of high-temperature molten steel and protecting the main structure of the emergency pit.

[0050] Furthermore, the side wall module 300 is also made of high-alumina explosion-proof castable or aluminum-magnesium explosion-proof castable, which is consistent with the material of the filler block 220. This ensures that the fire-resistant lining structure of the emergency accident pit has consistent thermal and mechanical properties, and avoids interface cracking and deformation due to material differences.

[0051] The side wall module 300 is formed by integral formwork and one-time casting, without construction joints or cold joints. The structure is continuous, dense and uniform, and its integrity is far superior to the traditional refractory brick masonry and segmented casting process.

[0052] The 300 sidewall module has a uniform thickness and a smooth surface, and fits tightly to the concrete sidewall without any voids or gaps. It has good thermal insulation properties and can effectively protect the concrete base layer of the emergency accident pit sidewall, extending the service life of the emergency accident pit.

[0053] In another embodiment of the present invention, a construction method for an emergency accident pit is described. This construction method is applicable to the emergency accident pits described in any of the above embodiments.

[0054] The construction method of the emergency accident pit mainly includes two steps: First, assemble the bottom wall module 200 inside the pit body 100; second, complete the pouring construction of the side wall module 300 in one go by using the integral formwork pouring method.

[0055] This construction method utilizes precast blocks 210 to first assemble the main body of the bottom wall, then uses explosion-proof castable to fill the gaps between the precast blocks 210 to form a bottom wall module 200 that combines with the precast blocks 220. Finally, the side wall module 300 is poured. This method ensures a good connection between the bottom wall module 200 and the side wall module 300, without cracks or leakage. It fully leverages the advantages of stable precast component quality and fast on-site construction, solves the defects of insufficient on-site baking conditions, and balances construction efficiency and structural quality.

[0056] Furthermore, assembling the bottom wall module 200 within the pit body 100 includes the following specific steps: laying precast blocks 210 on the bottom surface of the pit body 100, filling the gaps between adjacent precast blocks 210 with explosion-proof castable material to form filling blocks 220, and connecting the precast blocks 210 into a whole.

[0057] Specifically, the bottom surface of the pit 100 is first cleaned and leveled; then, according to the design layout, the precast blocks 210 are laid flat on the bottom surface of the pit 100, with uniform and continuous gaps reserved between adjacent precast blocks 210; after the precast blocks 210 are laid and inspected and qualified, high-alumina or aluminum-magnesium explosion-proof castable is poured into the gaps between adjacent precast blocks 210, and high-frequency vibration tools are used to vibrate and ensure that the castable forms filling blocks 220 that fill the gaps, so that the filling blocks 220 connect all the precast blocks 210 into a stable integral structure.

[0058] Furthermore, the step of laying precast blocks 210 on the bottom surface of the pit body 100 includes: baking and preparing precast blocks 210 in a workshop, hoisting the precast blocks 210 to the bottom surface of the pit body 100, laying the precast blocks 210 and leaving gaps between adjacent precast blocks 210.

[0059] Specifically, firstly, precast blocks 210 are manufactured in a professional production workshop according to the design dimensions; then, they are baked in a gradient using specialized baking equipment in the workshop, with strict control over the heating rate, holding time, and maximum baking temperature to ensure that the precast blocks 210 have a stable structure, meet the strength requirements, and have no risk of cracking; the qualified precast blocks 210 are hoisted to the bottom of the pit 100, and adjacent precast blocks 210 are laid at the preset spacing to create favorable conditions for subsequent filling material pouring.

[0060] Precast blocks 210 are prepared by baking in the workshop, which solves the problem of incomplete baking and cracking of the bottom of the refractory lining structure due to the inability to provide gradient baking conditions on the construction site. This construction method can tightly connect the filling blocks 220 and the precast blocks 210, significantly improving the sealing, flatness, and structural strength of the bottom wall module 200, effectively preventing molten steel penetration, facilitating subsequent slag removal operations, and improving the overall service life and safety performance of the accident pit.

[0061] Furthermore, the method of casting the side wall module 300 by integral formwork includes: erecting an inner lining template on the bottom wall module 200 along the direction of the side wall of the pit 100, so that a cavity with a consistent spacing is formed between the inner lining template and the side of the pit 100, and pouring explosion-proof casting material into the cavity.

[0062] Specifically, after the bottom wall module 200 is completed and reaches a certain strength, the inner lining template is erected on the bottom wall module 200 along the direction of the side wall of the pit body 100.

[0063] The template and the 100mm concrete side of the pit are kept at a uniform distance to form a casting cavity with precise thickness and continuous continuity.

[0064] After the inner lining template is erected, high-alumina or aluminum-magnesium explosion-proof castable is continuously and evenly poured into the cavity through the pouring port.

[0065] Preferably, when pouring to the designed height, the top of the side wall module 300 is chamfered and trimmed to form a slope 310.

[0066] In this embodiment, the side wall module 300 is cast using an integral formwork, which ensures the flatness, integrity and dimensional accuracy of the side wall module 300, and makes the side wall module 300 subject to uniform stress and has excellent anti-seepage and leak-proof performance.

[0067] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0068] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0069] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms are not limited to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An emergency accident pit for a vacuum degassing furnace, characterized in that, include: The pit body (100) has a cylindrical cavity with an open top; A bottom wall module (200) is laid on the bottom surface of the cylindrical cavity; A sidewall module (300) is attached to the inner side of the cylindrical cavity, and the sidewall module (300) extends upward from the bottom wall module (200); The bottom wall module (200) includes prefabricated blocks (210) and filling blocks (220). Several prefabricated blocks (210) are laid flat on the bottom surface of the cylindrical cavity and there is a gap between any adjacent prefabricated blocks (210). The filling blocks (220) are embedded in the gaps to connect adjacent prefabricated blocks (210).

2. The emergency accident pit for a vacuum degassing furnace according to claim 1, characterized in that, The precast block (210) is provided with a wedge-shaped portion (211) extending along the edge of its plate surface. The sharp edge of the wedge-shaped portion (211) is centrally located between two plates of the precast block (210) so that the gap width between adjacent precast blocks (210) varies with the oblique side surface of the wedge-shaped portion (211).

3. The emergency accident pit for a vacuum degassing furnace according to claim 1 or 2, characterized in that, Also includes: A concrete platform (400) is connected to the inner side of the cylindrical cavity and is higher than the sidewall module (300). Four concrete platforms (400) are symmetrically distributed in pairs along the circumference of the cylindrical cavity. A ladle support frame (500) is provided, with its two ends connected to the concrete platform (400). Two ladle support frames (500) are arranged in parallel and spaced apart to support the molten steel ladle.

4. The emergency accident pit for a vacuum degassing furnace according to claim 3, characterized in that, The top of the sidewall module (300) is provided with a slope (310), and the angle between the slope (310) and the horizontal plane is 45°.

5. The emergency accident pit for a vacuum degassing furnace according to claim 4, characterized in that, The filler block (220) is made of high-alumina or aluminum-magnesium explosion-proof castable.

6. The emergency accident pit for a vacuum degassing furnace according to claim 5, characterized in that, The sidewall module (300) is made of high-alumina or aluminum-magnesium explosion-proof castable.

7. A construction method for an emergency accident pit, characterized in that, An emergency pit for a vacuum degassing furnace as described in any one of claims 1 to 6, comprising: Assemble the bottom wall module (200) inside the pit (100); The side wall modules (300) were poured using an integral formwork casting method.

8. The construction method for the emergency accident pit according to claim 7, characterized in that, The assembly of the bottom wall module (200) within the pit (100) includes: Precast blocks (210) are laid on the bottom surface of the pit (100), and explosion-proof castable is filled into the gaps between adjacent precast blocks (210) to form filler blocks (220), connecting the precast blocks (210) into a whole.

9. The construction method for the emergency accident pit according to claim 8, characterized in that, The laying of precast blocks (210) on the bottom surface of the pit (100) includes: Precast blocks (210) are prepared by baking in the workshop. The precast blocks (210) are then hoisted to the bottom of the pit (100), and the precast blocks (210) are laid with gaps between adjacent precast blocks (210).

10. The construction method of the emergency accident pit according to claim 9, characterized in that, The method of casting the sidewall module (300) using integral formwork includes: Along the direction of the side wall of the pit (100), an inner lining template is erected on the bottom wall module (200) so that a cavity with a consistent spacing is formed between the inner lining template and the side of the pit (100), and explosion-proof casting material is poured into the cavity.

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