A cofferdam structure for treating calcium carbide waste residue and a cofferdam construction method

Abstract

The application discloses a cofferdam structure and a cofferdam construction method for treating calcium carbide waste residues, and the complete treatment structure is composed of a multi-stage stacked cofferdam wall, an anti-seepage component and a reinforcing frame, the multi-layer sub-walls are stacked layer by layer, and the internal frame units are matched to form a stable stress system, which can effectively offset the lateral pressure of the waste residues and make the overall structure have high deformation resistance. The bottom surface and the inner wall of each stage of wall are paved with the anti-seepage component, the anti-seepage structures of different levels are staggered and connected, a complete closed protective layer is formed, and the outward diffusion of alkaline seepage is effectively blocked. Relying on the vertical stacked layout form, multiple independent storage areas can be divided, the vertical space is fully utilized, and the large-scale storage and disposal requirements of the calcium carbide waste residues can be met. The cofferdam structure and the cofferdam construction method for treating calcium carbide waste residues have the beneficial effects of high overall structure strength, excellent anti-seepage sealing performance and large waste residue disposal capacity.

Description

Technical Field

[0001] This invention relates to the field of environmental solid waste treatment technology, specifically to a cofferdam structure and cofferdam construction method for treating calcium carbide waste residue. Background Technology

[0002] Calcium carbide waste residue is an industrial waste residue generated during the acetylene production process from calcium carbide. The residue contains unreacted calcium carbide particles, and the passivation layer on the particle surface is easily damaged when haphazardly piled up. Upon contact with water, these particles continuously release acetylene gas, posing an explosion hazard. Furthermore, the dust and alkaline leachate from the waste residue severely damage the surrounding ecological environment. Currently, the common practice for storing calcium carbide waste residue is direct stockpiling after pressure filtration and dewatering. The storage dikes used are often constructed using concrete pouring or earthwork. While some concrete dikes can be built in layers, the overall structural design has significant limitations. Conventional layered concrete dikes have insufficient bonding strength between layers, and the lateral loads generated by the stockpiling can easily cause interlayer misalignment and slippage, resulting in poor overall load-bearing stability. Moreover, traditional dike seepage prevention structures are often of a single type, making it difficult to form a continuous layered seepage prevention system, and leakage of the waste residue slurry is likely to occur. Meanwhile, conventional cofferdam structures cannot utilize the stored materials in the lower layer to support and limit the upper layer structure, limiting the height of the tiered construction. They also cannot meet the process requirements of graded sedimentation and stratified treatment of calcium carbide waste residue, making it difficult to simultaneously meet the multiple requirements of safe storage, pollution prevention, and harmless reaction treatment of materials. Summary of the Invention

[0003] To overcome the above-mentioned shortcomings in the prior art, the present invention provides a cofferdam structure for treating calcium carbide waste residue with high overall structural strength, excellent seepage prevention and sealing performance, and large waste residue disposal capacity.

[0004] The technical solution of the present invention is, in one aspect, as follows:

[0005] A cofferdam structure for treating calcium carbide waste includes a multi-stage stacked cofferdam wall, anti-seepage components, and a reinforcing frame.

[0006] The multi-level stacked cofferdam wall is composed of multiple layers of cofferdam sub-walls stacked from bottom to top. The material in the storage area of ​​the lower cofferdam sub-wall can support and limit the material in the storage area of ​​the upper cofferdam sub-wall.

[0007] The seepage prevention components are laid on the bottom surface and inner wall of each level of cofferdam sub-wall. The seepage prevention components and the cofferdam sub-wall enclose the seepage prevention storage area. The bottom surface elevation of the seepage prevention components of the upper cofferdam sub-wall is lower than the top surface elevation of the lower cofferdam sub-wall.

[0008] The reinforcing frame comprises multiple sets of frame units, each of which is evenly spaced along the length of the corresponding cofferdam sub-wall and is embedded inside the cofferdam sub-wall.

[0009] Preferably, the seepage-proof component is a seepage-proof fabric, which is laid continuously with overlapping sections along the height of the cofferdam wall, and the overlapping gaps are sealed.

[0010] In any of the above solutions, it is preferred that each group of frame units is assembled and combined from an L-shaped support frame and a transverse connecting frame;

[0011] Among them, multiple sets of L-shaped support frames corresponding to the same cofferdam sub-wall are evenly distributed along the length direction of the cofferdam sub-wall, and the transverse connecting frame extends along the length direction of the cofferdam sub-wall, and the adjacent L-shaped support frames are fixed and overlapped in sequence, so that the L-shaped support frames on the same layer are connected to form an integral load-bearing frame.

[0012] In any of the above embodiments, it is preferred that the L-shaped support frame has two sections, one section of which is embedded inside the cofferdam sub-wall, and the other section extends into the seepage-proof storage area.

[0013] In any of the above embodiments, it is preferred that the extension section of the L-shaped support frame is housed in the calcium carbide waste slag piled up in the seepage prevention storage area, and the bearing force exerted by the calcium carbide waste slag on the extension section of the frame is converted into an oblique tie constraint on the cofferdam sub-wall by the L-shaped support frame.

[0014] In any of the above embodiments, it is preferred that the end of the extension section of the L-shaped support frame is provided with an anchor plate, which is used to increase the contact area with the calcium carbide waste residue to prevent the extension section of the frame from sliding or being pulled out of the calcium carbide waste residue.

[0015] In any of the above schemes, it is preferred that each of the cofferdam sub-walls is formed by mixing and compacting calcium carbide waste slag sediment with carbonate reinforcing auxiliary materials, wherein the calcium carbide waste slag sediment serves as the aggregate matrix and the carbonate reinforcing auxiliary materials serve as the cementing modification component.

[0016] In any of the above schemes, it is preferred that an interlocking interface is formed between two adjacent layers of the cofferdam sub-walls.

[0017] In any of the above embodiments, it is preferred that the interlocking interface has a structure consisting of a groove and a protrusion between the upper cofferdam sub-wall and the lower cofferdam sub-wall.

[0018] Another aspect of the technical solution of the present invention is:

[0019] A method for constructing a cofferdam for treating calcium carbide waste, applied to the cofferdam structure described in any of the above schemes, includes the following steps:

[0020] Step 1: At the designated location of the first-layer cofferdam sub-wall, L-shaped support frames are evenly distributed along the length direction and fixed with transverse connecting frames to form the bottom frame unit;

[0021] Step 2: Take calcium carbide waste residue sediment and mix it with carbonate auxiliary materials. After mixing, compact and build the first layer of cofferdam sub-wall in layers, so that the bottom frame unit is embedded in the wall.

[0022] Step 3: Lay anti-seepage components on the bottom surface and inner wall of the cofferdam to form an anti-seepage storage area;

[0023] Step 4: Introduce calcium carbide waste into the cofferdam wall of this layer;

[0024] Repeat steps one through four to construct the upper seepage-proof storage area layer by layer.

[0025] This invention relates to a cofferdam structure and construction method for treating calcium carbide waste residue. The complete treatment structure is composed of multi-level stacked cofferdam walls, anti-seepage components, and a reinforcing frame. Multiple sub-walls are stacked layer by layer, forming a stable load-bearing system with internal frame units, effectively offsetting the lateral pressure from the waste residue and giving the overall structure high resistance to deformation. Anti-seepage components are laid on the bottom and inner walls of each level of wall, with staggered connections between layers forming a complete and sealed protective layer, effectively preventing the outward diffusion of alkaline leachate. Utilizing the vertical stacked layout, multiple independent storage areas can be divided, making full use of vertical space and meeting the needs for large-scale storage and treatment of calcium carbide waste residue. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of an embodiment of the cofferdam structure for treating calcium carbide waste according to the present invention.

[0027] Figure 2 This is a schematic cross-sectional view along one side of the cofferdam structure for treating calcium carbide waste according to the present invention.

[0028] Figure 3 This is a schematic diagram of a preferred embodiment of the reinforcing frame and the sub-wall of the cofferdam structure for treating calcium carbide waste of the present invention.

[0029] Figure 4 This is a schematic diagram of a preferred embodiment of the cofferdam structure for treating calcium carbide waste of the present invention, showing the cooperation between two adjacent cofferdam sub-walls.

[0030] Explanation of the labels in the diagram:

[0031] 101-Seepage-proof storage area; 102-Cofferdam sub-wall; 103-Horizontal connecting frame; 104-Seepage-proof cloth; 105-L-shaped support frame; 106-Anchor plate. Detailed Implementation

[0032] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for 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 invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] Example 1:

[0035] This embodiment specifically discloses a cofferdam structure for treating calcium carbide waste residue. This structure is specifically adapted to calcium carbide waste residue generated during acetylene production and is used to store and hydrate the waste residue, thereby solving the safety hazards and environmental pollution problems existing in the current calcium carbide waste residue stacking and disposal process.

[0036] In the production process of acetylene from calcium carbide, acetylene gas is mainly generated through a violent chemical reaction between calcium carbide and water. The entire reaction process is fast and highly exothermic. A dense oxide passivation layer quickly forms on the surface of the calcium carbide particles. This passivation film prevents water from contacting the unreacted calcium carbide inside the particles, resulting in a large amount of calcium carbide material not being fully reacted and remaining as particles inside the calcium carbide waste residue. Currently, the industry commonly uses a disposal method of direct pressure filtration dewatering followed by open-air stockpiling and transportation for sale. After pressure filtration, the moisture content of the calcium carbide waste residue is maintained at approximately 40%, and the residue contains a large number of incompletely hydrolyzed calcium carbide particles. When this type of waste residue is arbitrarily stockpiled and transported by vehicles, the surface passivation structure is easily damaged. When the internal calcium carbide comes into contact with water again, it will continue to decompose and release acetylene gas. The continuous accumulation of acetylene gas can easily lead to an explosion, posing a great safety threat to the plant's production and surrounding personnel. Meanwhile, powdered calcium carbide waste residue is widely dispersed by wind, causing serious air dust pollution. The alkaline substances in the residue can also seep into the ground with rainwater, damaging the surrounding soil and groundwater. Furthermore, storage space for the waste residue is limited, and when supply and demand are imbalanced, haphazard dumping easily occurs, wasting recyclable waste residue resources and failing to meet clean production and environmental standards. Based on these practical disposal challenges, this invention specifically developed a multi-stage stacked calcium carbide waste residue cofferdam structure. Combined with pre-treatment processes such as impurity removal, grading, and concentration, it transforms solid calcium carbide waste residue into a slurry form for zoned storage and disposal. From a storage structure perspective, this ensures safe decomposition, seepage-proof storage, and subsequent resource reuse of the waste residue.

[0037] like Figure 1 , 2 As shown, the cofferdam structure in this embodiment is composed of three main parts: a multi-level stacked cofferdam wall, seepage prevention components, and a reinforcing frame. Once formed, it is a monolithic stacked structure. The multi-level stacked cofferdam wall is constructed by stacking multiple layers of cofferdam sub-walls 102 in a bottom-up sequence. Each layer of cofferdam sub-wall 102 has a trapezoidal cross-section, following a structural design principle of being wider at the bottom and narrower at the top; that is, the overall width of the lower layer of cofferdam sub-wall is greater than the width of the upper layer. Relying on this structural characteristic, the lower layer of cofferdam sub-wall can reliably support and limit the upper layer of cofferdam sub-wall, improving the overall cofferdam's resistance to overturning and lateral pressure.

[0038] In actual operation, the pace of layered cofferdam construction is matched with the progress of waste residue hydrolysis. The first layer of cofferdam sub-wall 102 encloses the first independent treatment and storage area, where the calcium carbide slag slurry, after being treated by vibrating screen for impurity removal, hydrocyclone classification, and thickening tank concentration, is transported to this storage area 101. After entering the area, the slurry slowly settles, and the remaining calcium carbide particles inside undergo simultaneous and gradual hydrolysis. When the waste residue inside the single-layer storage area 101 is completely filled, the unreacted calcium carbide inside the waste residue is also basically hydrolyzed and decomposed, completely eliminating the risk of acetylene spillage and explosion. After the first layer of treatment is completed, an upper layer of cofferdam sub-wall can be built on top of it to divide a new independent seepage-proof storage area, continuously receiving calcium carbide slag slurry produced in subsequent production. This layer-by-layer stacking construction achieves uninterrupted continuous treatment of calcium carbide waste residue.

[0039] In this embodiment, the cofferdam sub-wall 102 is formed using locally sourced materials. Each layer of the cofferdam sub-wall 102 is constructed by mixing and compacting calcium carbide waste residue settling material with carbonate reinforcing materials. The calcium carbide waste residue settling material, after hydration, settling, and drying, serves as the aggregate matrix for the wall formation, ensuring both the foundation volume and the economic efficiency of using locally sourced materials. The carbonate reinforcing materials, as a binder and modifier, are incorporated into the material, effectively improving the mixing strength, density, and erosion resistance. After the two types of materials are uniformly mixed according to the specified ratio, the mixture is transported to the corresponding level to be constructed using a lifting device. Then, engineering machinery with matching forming templates is used to compact the material in layers. After compaction and solidification, the cofferdam sub-wall 102, possessing pressure-bearing and deformation-resistant capabilities, is formed. This method of using locally sourced materials also achieves the resource recycling of waste residue.

[0040] Once the entire cofferdam is stacked to the designated number of layers and overall height according to design standards, the desulfurization products and calcium carbide slag coarse materials stored inside can be retrieved layer by layer from top to bottom, based on production, sales, and reprocessing needs. During the material retrieval process, the multi-layered stacked cofferdam sub-walls 102 maintain overall structural stability and do not deform due to their solidified structural strength, preventing wall collapse or cracking. After all materials inside the cofferdam have been retrieved, only the old seepage prevention components need to be removed, and new seepage prevention components need to be laid inside the cofferdam walls. The entire multi-stage stacked cofferdam structure can then be reused for calcium carbide waste disposal, allowing for repeated recycling and significantly reducing site construction and facility replacement costs.

[0041] It should be noted that the cofferdam storage structure in this embodiment is used to treat calcium carbide waste in a solid-liquid mixed state. During operation, the solid and liquid are first concentrated through sedimentation, and then the concentrated waste is transferred to the cofferdam for seepage prevention and storage. Suspended solid-liquid waste with similar physical properties to calcium carbide waste, such as red mud, phosphogypsum slurry, metal tailings slurry, desulfurization ash slurry, and heavy metal neutralization sludge, can all be stored and disposed of using this cofferdam structure.

[0042] To further enhance the structural stability of each layer of cofferdam sub-wall 102, a reinforcing frame is embedded inside the cofferdam sub-wall 102. The reinforcing frame consists of multiple sets of frame units, which are evenly spaced along the length of the corresponding cofferdam sub-wall 102. The embedded frame units become the internal load-bearing skeleton of the wall, effectively offsetting the lateral extrusion pressure of waste slurry and the force caused by slight ground settlement, thus avoiding the problem of wall deformation and damage.

[0043] The seepage-proof components in this structure are made of seepage-proof fabric. The seepage-proof fabric 104 is laid and installed on the bottom surface and inner wall of each level of the cofferdam sub-wall 102. The seepage-proof fabric 104 and the cofferdam sub-wall 102 enclose each other, forming a sealed and isolated seepage-proof storage area 101. Taking the first-level cofferdam at the ground base as an example, during construction, the factory ground is used directly as the base surface of the cofferdam. First, the seepage-proof fabric 104 is laid flat on the base ground, and then extended vertically upwards along the inner wall of the cofferdam sub-wall 102. The top edge of the seepage-proof fabric 104 overlaps and is laid on the upper surface of the cofferdam sub-wall 102, forming a fully enclosed seepage-proof structure. The seepage-proof fabric 104 is laid continuously with overlaps along the height of the cofferdam wall, and all gaps resulting from the overlaps are sealed. At the same time, sealing and seepage prevention treatment is also carried out at the joints between the seepage prevention components and the internal reinforcing frame to prevent waste slurry from leaking out from the joints of the components.

[0044] In terms of hierarchical arrangement, the bottom elevation of the anti-seepage components laid on the upper cofferdam sub-wall is lower than the top elevation of the lower cofferdam sub-wall. The anti-seepage structures between layers are interconnected and interlocked, ensuring the continuity of the entire anti-seepage system without any breaks. The calcium carbide slag slurry in the sealed anti-seepage storage area 101 can stably complete the water sedimentation and hydration reaction, which not only completely eliminates the internal safety hazards of the waste residue, but also firmly prevents alkaline waste liquid from seeping into the ground and waste residue dust from spreading outward, thus comprehensively meeting the actual production needs of safe storage, environmentally friendly disposal, and recycling of calcium carbide waste residue.

[0045] Example 2:

[0046] Based on Example 1, such as Figure 2 , 3 As shown, this embodiment provides a preferred form of the reinforced frame. Specifically, each frame unit is assembled from L-shaped support frames 105 and transverse connecting frames 103. Multiple sets of L-shaped support frames 105 corresponding to the same cofferdam sub-wall 102 are evenly distributed along the length of the cofferdam sub-wall 102. The transverse connecting frames 103 extend along the length of the cofferdam sub-wall 102, and adjacent L-shaped support frames 105 are sequentially fixed and overlapped, so that the L-shaped support frames 105 on the same layer are connected to form an integral load-bearing frame.

[0047] During the construction and erection phase of each layer of cofferdam sub-wall 102, the pre-embedded assembly of the frame units is completed in advance. During construction, L-shaped support frames 105 are anchored and fixed to the top surface of the next layer of formed cofferdam sub-wall 102. Multiple sets of L-shaped support frames 105 are arranged sequentially along the length of the wall at predetermined intervals. After placement, adjacent sets of L-shaped support frames 105 are sequentially connected and fixed using transverse connecting frames 103. The dispersed individual support frames are then connected through assembly, ultimately forming a complete and unified frame unit. All frame units are evenly spaced along the length of the corresponding cofferdam sub-wall 102 and are integrally embedded within the compacted cofferdam sub-wall 102, becoming the core load-bearing skeleton inside the wall, thus strengthening the wall's load-bearing capacity from within.

[0048] In this embodiment, the single L-shaped support frame 105 is composed of two mutually perpendicular frame structures, which are integrally formed and arranged. One frame is completely embedded and enclosed inside the cofferdam sub-wall 102, relying on the clamping force generated after the wall mixture is compacted and cured to achieve a stable connection between the L-shaped support frame 105 and the wall. The other frame of the L-shaped support frame 105 extends horizontally towards the inside of the cofferdam sub-wall 102, with its end directly extending into the seepage-proof storage area 101 formed by the wall enclosure, completely immersed in the calcium carbide waste slurry and the settled and solidified waste material.

[0049] As calcium carbide waste material is continuously filled into the seepage-proof storage area 101, the accumulated waste material will "hold" the frame extending into the storage area 101, preventing the section from reversing or shifting laterally. This limits the outward displacement and bulging deformation of the cofferdam wall, ensuring that the frame and wall always maintain a stable fit.

[0050] In this embodiment, an anchor plate 106 is fixedly installed at the end of the frame extending into the seepage-proof storage area 101. The anchor plate 106 adopts a horizontal and vertical combined plate structure, which is formed by horizontal plates and vertical plates being spliced ​​perpendicularly to each other. The anchor plate 106 is arranged along the extension direction of the extending section of the frame, thereby increasing the contact area between the end of the frame and the surrounding calcium carbide waste material. When the waste material tightly wraps the anchor plate 106, a strong interlocking force is generated by the large contact area structure. This can effectively prevent the extending section of the frame from sliding laterally inside the waste, and at the same time, the vertical plates prevent the frame from turning at an angle, preventing the L-shaped support frame 105 from loosening and being pulled out of the accumulated calcium carbide waste, as well as the problem of reversal, thereby comprehensively improving the deformation resistance and damage resistance of the multi-stage stacked cofferdam wall.

[0051] Example 3:

[0052] Based on Example 1 or 2, such as Figure 4 As shown, this effectively improves the shear resistance between the two adjacent cofferdam sub-walls 102.

[0053] In this embodiment, an interlocking interface is provided between two adjacent cofferdam sub-walls 102. The interlocking structure constrains the relative displacement between layers, significantly improving the interlayer shear bearing capacity. During actual construction, matching grooves and protrusions are simultaneously formed on the bottom surface of the upper cofferdam sub-wall and the top surface of the lower cofferdam sub-wall. The protrusions can be inserted into the grooves, and the two fit together to form a complete interlocking interface.

[0054] The interlocking structure is continuously arranged along the length of the cofferdam sub-wall 102, conforming to the overall contour of the wall. The upper and lower walls are interlocked and restrained by grooves and protrusions, transforming the original simple planar contact force distribution into an interlocking force distribution. When the wall is subjected to lateral shear force, the sidewall of the protrusion will abut against the sidewall of the groove, effectively counteracting the tendency of horizontal slippage, greatly enhancing the shear resistance between the two layers of cofferdam sub-walls 102, and preventing interlayer slippage and separation.

[0055] Example 4:

[0056] Based on any of the embodiments in Examples 1-3, this embodiment provides a method for constructing a cofferdam for treating calcium carbide waste. The specific operation steps are as follows:

[0057] Step 1: Pre-installation and deployment of frame units. Select the construction location of the current level cofferdam sub-wall 102, using the already formed top surface of the cofferdam below as the working base, and arrange multiple sets of support frames at even intervals along the preset length of the wall. After the arrangement is completed, use the transverse connecting frame 103 to fix and overlap the adjacent support frames in sequence, assembling and combining them to form a complete bottom frame unit. Position and anchor the entire frame within the construction area of ​​this level of wall, thus building a solid internal load-bearing skeleton for the subsequent wall pouring and forming.

[0058] Step 2: Use local calcium carbide waste slag sediment as basic aggregate, add carbonate reinforcing auxiliary materials according to the ratio, mix the two types of materials thoroughly and evenly, and then spread them in layers on the outside of the frame unit and the surrounding area, and compact them layer by layer, so that the frame unit is embedded and compacted inside the cofferdam sub-wall 102. After forming, a cofferdam sub-wall 102 with compressive and lateral pressure resistance is formed, enclosing the preliminary outline of the storage space.

[0059] Step 3: Lay out-of-seepage components to construct a sealed out-of-seepage storage area 101. After the structure of the cofferdam sub-wall 102 is formed and initially stabilized, lay out-of-seepage components along the bottom surface and inner wall of this cofferdam layer. The out-of-seepage cloth 104 is overlapped and sealed according to the specifications, and works together with the cofferdam wall to form a closed and complete out-of-seepage storage area 101, blocking the leakage of waste residue slurry and avoiding alkaline waste liquid from polluting the surrounding water and soil environment.

[0060] Step four: Injecting waste residue material and completing the hydration and sedimentation reaction. The calcium carbide waste residue slurry, which has undergone impurity removal by a vibrating screen, classification by a hydrocyclone, and concentration treatment in the previous stage, is continuously introduced into the seepage-proof storage area 101. After entering the storage area 101, the waste residue is left to stand in a closed water environment. The unreacted calcium carbide particles remaining in the waste residue gradually come into full contact with the water, undergoing a complete hydrolysis reaction and completely releasing the acetylene gas trapped inside, thus eliminating the explosion safety hazard at its source. At the same time, the solid materials inside the slurry gradually settle and stratify naturally under their own weight. With the increase of the standing time, the material is continuously dehydrated and water is separated out, and the overall moisture content of the waste residue steadily decreases, while the compactness of the pile and its own structural strength gradually increase.

[0061] Once the waste material in the seepage-proof storage area 101 has accumulated to the designed height and the material has dehydrated and settled to the preset strength standard, the next layer of cofferdam sub-wall 102 can be constructed on the top surface of the currently completed cofferdam sub-wall 102, relying on the interlocking structure. The construction of the upper wall still follows the operational logic of pre-assembly of the frame, compaction of the wall, and laying of seepage-proof materials.

[0062] The entire multi-stage cofferdam is constructed by repeatedly executing steps one through four, building up layer by layer from bottom to top, following the aforementioned operational mode. Each layer of the cofferdam independently completes the entire process of wall construction, seepage prevention and sealing, waste residue feeding, hydrolysis and sedimentation, and dewatering and consolidation. Each layer sequentially receives the calcium carbide waste residue produced later, continuously completing the harmless treatment of the waste residue. Once the entire cofferdam reaches the designed number of layers and usable height, the treated desulfurization products and calcium carbide slag coarse materials can be taken from each layer according to production scheduling needs. After the materials are used up, the seepage prevention components are re-laid, and the entire cofferdam structure can be recycled for waste residue storage and treatment.

[0063] The above-described embodiments are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A cofferdam structure for treating calcium carbide waste, characterized in that, This includes multi-stage stacked cofferdam walls, seepage prevention components, and reinforced frames; The multi-level stacked cofferdam wall is composed of multiple layers of cofferdam sub-walls (102) stacked from bottom to top. The material in the storage area of ​​the lower cofferdam sub-wall can support and limit the material in the storage area of ​​the upper cofferdam sub-wall. The seepage prevention components are laid on the bottom surface and inner side wall of each level of cofferdam sub-wall (102). The seepage prevention components and the cofferdam sub-wall (102) enclose the seepage prevention storage area (101). The bottom surface elevation of the seepage prevention components of the upper cofferdam sub-wall is lower than the top surface elevation of the lower cofferdam sub-wall. The reinforcing frame comprises multiple sets of frame units, each of which is evenly spaced along the length of the corresponding cofferdam sub-wall (102) and embedded inside the cofferdam sub-wall (102).

2. The cofferdam structure for treating calcium carbide waste as described in claim 1, characterized in that, The seepage prevention component is a seepage prevention cloth (104). The seepage prevention cloth (104) is laid continuously with overlapping sections along the height of the cofferdam wall, and the overlapping gaps are sealed.

3. The cofferdam structure for treating calcium carbide waste as described in claim 1, characterized in that, Each frame unit is assembled from an L-shaped support frame (105) and a transverse connecting frame (103); Among them, multiple sets of L-shaped support frames (105) corresponding to the same cofferdam sub-wall (102) are evenly distributed along the length direction of the cofferdam sub-wall (102), and the transverse connecting frame (103) extends along the length direction of the cofferdam sub-wall (102) and fixes the adjacent L-shaped support frames (105) in sequence, so that the L-shaped support frames (105) on the same layer are connected into an overall load-bearing frame.

4. The cofferdam structure for treating calcium carbide waste as described in claim 3, characterized in that, The L-shaped support frame (105) has two sections, one of which is embedded inside the cofferdam sub-wall (102), and the other section extends into the seepage-proof storage area (101).

5. The cofferdam structure for treating calcium carbide waste as described in claim 4, characterized in that, The extended section of the L-shaped support frame (105) is housed in the calcium carbide waste piled up in the seepage prevention storage area (101). The bearing force exerted by the calcium carbide waste on the extended section is converted into an oblique tie constraint on the cofferdam sub-wall (102) through the L-shaped support frame (105).

6. The cofferdam structure for treating calcium carbide waste as described in claim 4, characterized in that, An anchor plate (106) is provided at the end of the extended section of the L-shaped support frame (105). The anchor plate (106) is used to increase the contact area with the calcium carbide waste residue to prevent the extended section of the frame from sliding or being pulled out of the calcium carbide waste residue.

7. The cofferdam structure for treating calcium carbide waste as described in claim 1, characterized in that, Each cofferdam sub-wall (102) is formed by mixing and compacting calcium carbide waste slag settling material and carbonate reinforcing auxiliary material, wherein the calcium carbide waste slag settling material serves as the aggregate matrix and the carbonate reinforcing auxiliary material serves as the cementing modification component.

8. The cofferdam structure for treating calcium carbide waste as described in claim 7, characterized in that, An interlocking interface is formed between the two adjacent cofferdam sub-walls (102).

9. The cofferdam structure for treating calcium carbide waste as described in claim 8, characterized in that, The interlocking interface consists of grooves and protrusions between the upper and lower cofferdam sub-walls.

10. A method for constructing a cofferdam for treating calcium carbide waste, applied to the cofferdam structure described in any one of claims 1 to 9, characterized in that, Includes the following steps: Step 1: At the designated position of the first-layer cofferdam sub-wall, L-shaped support frames (105) are evenly distributed along the length direction and fixed with transverse connecting frames (103) to form the bottom frame unit; Step 2: Take calcium carbide waste residue sediment and mix it with carbonate auxiliary materials. After mixing, compact and build the first layer of cofferdam sub-wall in layers, so that the bottom frame unit is embedded in the wall. Step 3: Lay anti-seepage components on the bottom surface and inner wall of the cofferdam wall to form an anti-seepage storage area (101). Step 4: Introduce calcium carbide waste into the cofferdam wall of this layer; Repeat steps one through four to construct the upper seepage-proof storage area layer by layer.

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