A method for removing an acid tank in a confined space

Abstract

The present application relates to a kind of acid tank dismantling construction methods in confined space, neutralize acid concentration in acid tank, use purified water to carry out cycle flushing;According to the size of structure platform column spacing, cut several sections segmentedly;Use air pick to remove acid-resistant brick width 300mm in cutting seam, expose tank body rubber lining;Use flat shovel to remove lining in cutting seam;Use oxyacetylene along cutting seam to disintegrate tank body;Remove the pattern plate of structure platform above acid tank, hoist tank body by crane through below platform, rotate 90 degrees, and hoist tank body away from platform edge;Lay down roller steel pipe below, hoist tank body out and place in specified location area and stack.The present application can realize the quick dismantling of acid tank, solve the problem that acid tank is not easy to remove in confined space.The present application can shorten the acid tank dismantling time, and the construction method is reliable in connection;Use crane to disintegrate and hoist to remove, reduce heavy physical labor, improve work efficiency.

Description

Technical Field

[0001] This invention relates to the field of acid tank dismantling technology, and in particular to a construction method for dismantling acid tanks in confined spaces. Background Technology

[0002] High-grade non-oriented silicon steel used in new energy vehicles, air conditioning compressors, and industrial motor cores is driving a rapid growth in demand for high-grade steel. Currently, high-grade non-oriented silicon steel is developing towards higher strength, thinner profiles, higher silicon content, and higher efficiency, accelerating the transformation of outdated production equipment and capacity, and improving the industry's technological level.

[0003] Pickling equipment is used to remove oxide scale from hot-rolled steel strips. Its principle is to sequentially immerse the steel strip in multiple pickling tanks containing pickling solution, where it undergoes a chemical reaction with the solution, thus removing the surface oxide scale. Pickling tanks are typically lifted as a whole using a large crane, which is convenient, quick, and allows for ample space on the site, enabling a single, efficient operation. However, in locations with significant site constraints, complete transportation and hoisting cannot be achieved. . Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a construction method for dismantling acid tanks in confined spaces, which can shorten the dismantling time and ensure reliable construction method connection; the use of overhead cranes for segmented dismantling and hoisting reduces heavy physical labor and improves work efficiency.

[0006] The technical solution adopted by this invention to solve its technical problem is: to provide a method for dismantling acid tanks in a confined space, the specific operation steps of which are as follows:

[0007] Step 1: Use a crane to remove the checkered plate between the walkways on both sides of the 8.4-meter platform of the steel structure frame above the acid tank, so that the crane's main hook can move up and down freely.

[0008] Step 2: Before dismantling the acid tank, fill the inner tank with purified water and quicklime, and inject them into the acid tank through the acid washing circulation pump to neutralize the acid solution in the tank. Use test paper to check the pH of the solution until it reaches 4-6, and then drain the acid-containing wastewater from the tank.

[0009] Step 3: The hydraulic cylinder of the lifting and unloading machine lifts the swing arm upward to pull the acid tank cover upward; or the hydraulic cylinder of the lifting and unloading machine is disconnected from the swing arm connecting pin, and the overhead crane is used to directly pull the acid tank cover upward, and the safety pin is inserted to fix the acid tank cover.

[0010] Step 4: After the irritating gas in the acid tank has evaporated, replace the acid tank cover, remove the connecting pin between the swing arm and the cover lifting machine, and use a crane to remove the swing arm and acid tank cover as a whole, and stack them in a designated area; clean the acid sludge adhering to the inner wall and bottom of the acid tank.

[0011] Step 5: Locate the spacing of the 8.4-meter platform support columns using CAD, analyze the rotating tank, cut the tank into multiple sections according to the dimensions, and mark the locations of the dividing seams on the outer wall of the tank. Use a pneumatic pick to remove the acid-resistant bricks inside the tank at the cutting seams, removing a width of two bricks, 300mm. Remove the acid-resistant bricks from the side walls and bottom of the tank separately. Use an electric flat chisel to remove the flammable rubber lining adhering to the steel plate of the tank, exposing the steel structure of the acid tank body.

[0012] Step 6: Cover the acid-resistant bricks and rubber lining on both sides of the cut seam with a fireproof blanket, leaving 130mm in the center of the cut seam to prevent the rubber lining from igniting; use oxy-acetylene cutting to cut the dividing seam and cut the tank into sections; then cut multiple lifting lug holes symmetrically at the stiffening plate of the outer wall side plate of the tank. The lifting lug holes are used to hang wire ropes, hand chain hoists, and lifting slings.

[0013] Step 7: The main hook of the crane retracts from the location where the checkered plate was removed on the 8.4-meter steel structure platform and the lifting slings are attached. The tank is then leveled using a hand-operated hoist and lifted 0.5 meters smoothly. The main hook is rotated 90° counterclockwise to stop the tank, ensuring that the longitudinal center of the acid tank is perpendicular to the longitudinal centerline of the unit. A steel roller is placed on the 3.16-meter platform on the operating side of the acid tank. The main hook of the crane slowly retracts, placing one end of the acid tank on the steel roller and the other end on the 3.16-meter platform on the transmission side. The hook is slowly lifted, and the acid tank is moved outwards until the main hook wire rope of the crane contacts the platform. After the tank is stable, the lifting slings on the operating side are removed.

[0014] Step 8: Move the crane to the drive side until the main hook wire rope contacts the platform and stop. Hang the drive side wire rope on the end of the trough and protect the wire rope with rubber feet. Then move the crane main hook to the left and lift the hook, pulling the trough outward. Under the action of the roller steel pipe, the frictional resistance of the trough movement is greatly reduced. Stop when the trough has moved outward a distance of 3 / 5 of the trough length.

[0015] Step 9: Remove the slings and lift the main hook to the outside of the upper steel structure platform. Then, reattach the slings on both sides of the trough and tilt the trough to the stacking area. Ensure that there is a safe distance between the wire rope and the platform beam to prevent the wire rope and slings from getting stuck.

[0016] Step 10: Use a crane to remove the hoisting holes on the right side of the checkered plate walkway via the 8.4-meter steel structure platform. Use the crane to remove the cover removal machine and the anchor bolts of the oxy-acetylene cutting equipment for direct hoisting and removal.

[0017] Step 11: In the storage area, use purified water to rinse and clean the residual acid sludge on the inner wall of the acid tank, and then load the acid tank onto a truck for transportation to the waste disposal site.

[0018] As a supplement to the technical solution described in this invention, in step four, the acid sludge with strong adhesion in the acid tank is removed by an electric flat shovel, and then the removed acid sludge is cleaned into an acid-resistant barrel by a shovel, sealed, hoisted into a designated stacking area, and surrounded by toxic hazard signs.

[0019] As a supplement to the technical solution described in this invention, in step five, the overall length of the acid tank is 60-80 meters. Based on the distance between the platform columns, the tank is divided into 6-meter segments, and the dividing seams are drawn.

[0020] As a supplement to the technical solution described in this invention, in step nine, it is necessary to ensure that there is a safe distance between the wire rope and the platform beam to prevent the wire rope and slings from getting stuck.

[0021] Beneficial effects: This invention relates to a method for dismantling acid tanks in confined spaces. Compared with traditional methods, it can shorten the dismantling time and ensure reliable connection between construction methods. The use of a crane for segmented dismantling and hoisting reduces heavy physical labor and improves work efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the acid tank structure described in this invention;

[0024] Figure 3 This is a schematic diagram of acid-resistant bricks laid inside the tank body according to the present invention;

[0025] Figure 4 This is the present invention. Figure 3 Sectional view of AA;

[0026] Figure 5 This is a schematic diagram of the rotation of the tank as described in this invention;

[0027] Figures 6-9 This is a schematic diagram of the hoisting of the trough body described in this invention.

[0028] Illustration: 1. Cover lifting machine, 2. Acid tank cover, 3. Patterned plate, 4. Swing arm, 5. Tank body, 6. 3.16-meter platform, 7. Acid-resistant brick, 8. Roller steel pipe, 9. Lifting slings. Detailed Implementation

[0029] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0030] The embodiments of the present invention relate to a method for dismantling an acid tank in a confined space, such as... Figure 1-9 As shown, the acid tank is located inside the frame column below the 8.4-meter platform of the steel structure frame. The tank body 5 is located on the crossbeam of the 3.16-meter platform of the structure. Due to the confined space, the checkered plate 3 between the walkways of the 8.4-meter platform above was removed to facilitate the hoisting of the tank body.

[0031] like Figure 2 As shown: The acid tank consists of a cover lifting machine 1, an acid tank cover 2, a swing arm 4, a tank body 5, acid-resistant bricks 7, and rubber lining. Acid sludge remains on the inner wall of the tank.

[0032] The specific operation steps of the construction method are as follows: Step 1: Use a crane to remove the checkered plate 3 between the walkways on both sides of the 8.4-meter platform of the steel structure frame above the acid tank, so that the main hook of the crane can freely move up and down.

[0033] Step 2: Before dismantling the acid tank, fill the inner tank with purified water and quicklime, and inject them into the acid tank through the acid washing circulation pump to neutralize the acid solution in the tank. Use test paper to check the pH of the solution until it reaches 4-6, and then drain the acid-containing wastewater from the tank.

[0034] Step 3: The hydraulic cylinder of the lifting and unloading machine 1 lifts the swing arm 4 upward to pull the acid tank cover 2 upward; or the hydraulic cylinder of the lifting and unloading machine 1 is disconnected from the connecting pin of the swing arm 4, and the gantry crane is used to directly pull the acid tank cover 2 upward, and the safety pin is inserted to fix the acid tank cover 2.

[0035] Step 4: After the irritating gas in the acid tank has evaporated, replace the acid tank cover 2, remove the connecting pin between the swing arm 4 and the cover opening machine 1, and use a crane to remove the swing arm 4 and the acid tank cover 2 as a whole, and stack them in the designated area; clean the acid sludge adhering to the inner wall and bottom of the acid tank.

[0036] Step 5: Locate the spacing of the 8.4-meter platform support columns using CAD, analyze the rotating tank 5, and cut the tank 5 into multiple sections according to the dimensions. Mark the locations of the dividing seams on the outer wall of the tank 5. Figure 3 As shown: During the construction of the acid tank dividing joint, a pneumatic hammer is used to remove the acid-resistant bricks 7 inside the tank 5 at the cutting joint. The width of the removal is the width of two bricks, which is 300mm. The acid-resistant bricks 7 on the side wall and bottom of the tank 5 are removed respectively. An electric flat chisel is used to remove the flammable rubber lining attached to the steel plate of the tank 5, exposing the steel structure of the acid tank body.

[0037] Step 6: Cover the acid-resistant bricks 7 and rubber lining on both sides of the cutting seam with a fireproof blanket, leaving 130mm in the center of the cutting seam to prevent the rubber lining from igniting; use oxy-acetylene cutting to cut the dividing seam and cut the tank 5 into sections; then cut multiple lifting lug holes symmetrically at the side plate stiffener of the outer wall of the tank, the lifting lug holes are used to hang wire ropes, hand chain hoists and lifting slings 9.

[0038] Step 7: The main hook of the crane is retracted from the position of the patterned plate 3 on the steel structure 8.4 platform, and the lifting sling 9 is attached; the tank 5 is lifted 0.5 meters smoothly by leveling with a hand-operated hoist; the main hook is rotated to rotate the tank 5 counterclockwise by 90° and stop, so that the longitudinal center of the acid tank is perpendicular to the longitudinal center line of the unit; a roller steel pipe 8 is placed on the 3.16-meter platform 6 on the operating side of the acid tank, and the main hook of the crane is slowly retracted, placing one end of the acid tank on the steel pipe 8 and the other end on the 3.16-meter platform 6 on the transmission side; the hook is slowly lifted, and the acid tank is moved outward. It is stopped before the main hook wire rope of the crane contacts the platform. After the tank 5 is stable, the lifting sling 9 on the operating side is removed.

[0039] Step 8: Move the crane to the drive side until the main hook wire rope contacts the platform and stop. Hang the drive side wire rope on the end of the trough 5 and protect the wire rope with rubber feet. Then move the crane main hook to the left and lift the hook, pulling the trough 5 outward. Under the action of the roller steel pipe 8, the frictional resistance of the trough 5 movement is greatly reduced. Stop when the trough 5 has moved outward a distance of 3 / 5 of the trough length.

[0040] Step 9: Remove the lifting slings 9. When the main hook is raised to the outside of the upper steel structure platform, reattach the lifting slings 9 on both sides of the trough 5 and tilt the trough 5 to the stacking area; ensure that there is a safe distance between the wire rope and the platform beam to prevent the wire rope and lifting slings 9 from getting stuck.

[0041] Step 10: Use a crane to remove the hoisting hole on the right side of the walkway of the patterned plate 3 through the 8.4-meter steel structure platform. Use the crane to remove the cover removal machine 1 and the anchor bolts of the oxygen-acetylene cutting equipment, and remove them directly.

[0042] Step 11: In the storage area, use purified water to rinse and clean the residual acid sludge on the inner wall of the acid tank, and then load the acid tank onto a truck for transportation to the waste disposal site.

[0043] In step four, the acid sludge with strong adhesion in the acid tank is removed by an electric flat shovel, and then the removed acid sludge is cleaned into an acid-resistant barrel by a shovel, sealed, hoisted to a designated storage area, and surrounded by toxic hazard signs.

[0044] In step five, the overall length of the acid tank is 60-80 meters. Based on the distance between the platform columns, the tank body 5 is disassembled into 6-meter segments, and the dividing seams are drawn.

[0045] This invention neutralizes the acid concentration in the acid tank by circulating purified water for rinsing. Based on the spacing between the structural platform columns, the tank is cut into several sections. A 300mm wide section of acid-resistant brick is removed from the cut seams using a pneumatic hammer, exposing the tank's rubber lining. The rubber lining within the cut seams is then removed using a flat chisel. Oxygen and acetylene are used to dismantle the tank along the cut seams. The patterned plate of the structural platform above the acid tank is removed, and a crane is used to hoist the tank from below the platform, rotating it 90 degrees to lift it away from the platform edge. Roller steel pipes are laid underneath to lift the tank out and place it in a designated area. This invention enables rapid dismantling of acid tanks, solving the problem of difficult dismantling of acid tanks in confined spaces.

[0046] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0047] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0048] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0049] The above provides a detailed description of the construction method for dismantling an acid tank in a confined space provided by this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for dismantling an acid tank in a confined space, characterized in that: The specific operating steps are as follows: Step 1: Use a crane to remove the checkered plate (3) between the walkways on both sides of the 8.4-meter steel structure platform above the acid tank, so that the crane's main hook can freely move up and down. Step 2: Before dismantling the acid tank, fill the inner tank with purified water and quicklime, and inject them into the acid tank through the acid washing circulation pump to neutralize the acid solution in the tank. Use test paper to check the pH of the solution until it reaches 4-6, and then drain the acid-containing wastewater from the tank. Step 3: The hydraulic cylinder of the lifting and unloading machine (1) lifts the swing arm (4) upward to pull up the acid tank cover (2); or disconnect the hydraulic cylinder of the lifting and unloading machine (1) from the swing arm (4) and use a crane to directly pull up the acid tank cover (2) and insert the safety pin to fix the acid tank cover (2). Step 4: After the irritating gas in the acid tank has evaporated, put the acid tank cover (2) back in, remove the connecting pin between the swing arm (4) and the hydraulic cylinder of the cover lifting machine (1), use a crane to remove the swing arm (4) and the acid tank cover (2) as a whole, and stack them in the designated area; clean the acid mud attached to the inner wall and bottom of the acid tank. Step 5: Locate the spacing of the 8.4-meter platform support columns using CAD, analyze the rotating tank (5), cut the tank (5) into multiple sections according to the dimensions, and draw the dividing seam positions on the outer wall of the tank (5); use a pneumatic pick to remove the acid-resistant bricks (7) inside the tank (5) at the cutting seam, remove the width of two bricks, and the width is 300mm, remove the acid-resistant bricks (7) on the side wall and bottom of the tank (5) respectively, and use an electric flat chisel to remove the flammable lining glue attached to the steel plate of the tank (5) to expose the steel structure of the acid tank body; Step 6: Cover the acid-resistant bricks (7) and rubber lining on both sides of the cutting seam with fireproof blankets, leaving 130mm in the center of the cutting seam to prevent the rubber lining from igniting; use oxy-acetylene cutting to cut the dividing seam and cut the tank (5) into sections; then cut multiple lifting lug holes symmetrically at the side plate stiffener of the outer wall of the tank, the lifting lug holes are used to hang wire ropes, hand chain hoists and lifting slings (9). Step 7: The main hook of the crane is pulled back at the position where the patterned plate (3) is removed from the steel structure 8.4 platform, and the lifting sling (9) is attached; the tank (5) is lifted 0.5 meters by leveling with a hand hoist; the main hook is rotated to rotate the tank (5) 90° counterclockwise and stop, so that the longitudinal center of the acid tank is perpendicular to the longitudinal center line of the unit; a roller steel pipe (8) is placed on the 3.16-meter platform (6) on the operating side of the acid tank, and the main hook of the crane is slowly pulled back, placing one end of the acid tank on the steel pipe (8) and the other end of the acid tank on the 3.16-meter platform (6) on the transmission side; the hook is slowly lifted, and the acid tank is moved outward. It is stopped before the main hook wire rope of the crane contacts the platform. After the tank (5) is stable, the lifting sling (9) on the operating side is removed. Step 8: Move the crane to the drive side until the main hook wire rope contacts the platform and stop. Hang the drive side wire rope on the end of the trough (5) and use rubber to protect the wire rope. Then move the crane main hook to the left and lift the hook, and pull the trough (5) outward. Under the action of the roller steel pipe (8), the frictional resistance of the trough (5) is greatly reduced. Stop when the trough (5) has moved outward by 3 / 5 of the trough length. Step 9: Remove the slings (9), and when the main hook is lifted to the outside of the upper steel structure platform, reattach the slings (9) on both sides of the trough (5), and tilt the trough (5) to the stacking area; ensure that there is a safe distance between the wire rope and the platform beam to prevent the wire rope and slings (9) from getting stuck. Step 10: Use a crane to remove the patterned plate (3) from the right side walkway hoisting hole via the 8.4-meter steel structure platform. Use the crane to remove the cover removal machine (1) and the anchor bolts of the oxygen acetylene cutting equipment. Remove them directly by hoisting. Step 11: In the storage area, use purified water to rinse and clean the residual acid sludge on the inner wall of the acid tank, and then load the acid tank onto a truck for transportation to the waste disposal site.

2. The method for dismantling an acid tank in a confined space according to claim 1, characterized in that: In step four, the acid sludge with strong adhesion in the acid tank is removed by an electric flat shovel, and then the removed acid sludge is cleaned into an acid-resistant barrel by a shovel, sealed, hoisted to a designated storage area, and surrounded by toxic hazard signs.

3. The method for dismantling an acid tank in a confined space according to claim 1, characterized in that: In step five, the overall length of the acid tank is 60-80 meters. Based on the distance between the platform columns, the tank (5) is disassembled into 6-meter segments and the dividing seams are drawn.

4. The method for dismantling an acid tank in a confined space according to claim 1, characterized in that: In step nine, it is necessary to ensure that there is a safe distance between the wire rope and the platform beam to prevent the wire rope and slings from getting stuck (9).

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