Method for removing blind plate of water intake pipeline in front pool of water intake pump station

Abstract

The application provides a method for removing a blind plate of a water intake pipeline in a front pool of a water intake pump station, comprising the following steps: erecting a hoisting frame at an observation opening on the top of the front pool of the water intake pump station, fixing a load-bearing beam on the opening of the hoisting frame, and fixing a tension turning mechanism on the side wall of the load-bearing beam; arranging a lifting mechanism along the turning direction of the tension turning mechanism; removing the blind plate from the water intake pipeline, and pulling the force-acting end of the lifting mechanism to lift the blind plate upward from one side of the load-bearing beam along the turning direction of the tension turning mechanism to the top of the load-bearing beam, and then dragging the blind plate along the top of the load-bearing beam to a preset platform to complete the removal of the blind plate of the water intake pipeline. The application can solve the problems in the prior art, such as high construction cost, large number of mechanical shifts, low efficiency, long distance between the hoisting equipment and the observation opening, low safety, and the like.

Description

Technical Field

[0001] This invention relates to the field of pipeline construction technology, and more specifically, to a method for removing blind flanges from water intake pipelines in the forebay of a water intake pumping station. Background Technology

[0002] Water intake facilities are typically located in the center of the river, with the intake head placed in the center. Water is introduced into the pumping station through two 3000mm diameter intake pipes, then into the forebay, and finally into the axial flow pumps of the pumping station through 2400mm diameter electric butterfly valves. The water is then supplied to major water plants in the city for residents' drinking water.

[0003] During construction, to ensure the safety of the pumping station, blind flanges were installed at the ends of the pre-installed isolation butterfly valves during the blasting of the underwater water intake pipeline trench outside the station. This was done to prevent the vibrations from the blasting from damaging the valves. Once the underwater water intake pipeline was installed, the blind flanges were removed, and water was officially supplied to the pumping station.

[0004] Therefore, removing the blind flanges from the water intake pipeline in the water intake pumping station facilities is a crucial step in realizing the water intake function. Currently, there are two main methods. One method involves using a ship-mounted crane to lift the blind flanges. This requires positioning the ship-mounted crane as close as possible to the observation port at the top of the water intake pumping station's forebay, and then using the ship's lifting equipment to lift the underwater-disassembled blind flanges onto the platform. While this method can quickly remove the blind flanges, it is not suitable due to the high cost of the crane. The other method involves using a crane. The crane is driven to both sides of the observation port to lift the blind flanges. However, because the crane is far from the observation port, it is difficult to control the lifting angle, and the lifting process is not very intuitive, resulting in low safety. Furthermore, the entry and exit of large-scale cranes for lifting requires a large number of machine shifts, leading to low lifting efficiency.

[0005] In summary, the current methods for installing blind flanges have several drawbacks, including high construction costs, the need for a large number of machine shifts, low efficiency, and the distance between the lifting equipment and the observation port, making it impossible to directly observe the lifting process and resulting in low safety. Summary of the Invention

[0006] In view of the above problems, the purpose of this invention is to provide a method for removing blind flanges from water intake pipelines in the forebay of a water intake pumping station, so as to solve the problems of high construction costs, large number of machine shifts, low efficiency, and low safety caused by the existing blind flange hoisting method, which is far from the observation port and cannot be directly observed in the hoisting process.

[0007] This invention provides a method for removing the blind flange of the water intake pipeline in the forebay of a water intake pumping station, comprising the following steps:

[0008] A hoisting frame is erected at the observation port at the top of the water intake pumping station forebay, with the frame opening of the hoisting frame positioned above the blind plate of the water intake pipeline, and the top of the hoisting frame being higher than the height of the blind plate.

[0009] A load-bearing beam is fixed on the frame opening of the hoisting frame, and a tension steering mechanism is fixed on the side wall of the load-bearing beam.

[0010] A lifting mechanism is arranged along the turning direction of the pulling steering mechanism, such that the fixed end of the lifting mechanism is fixed on the lifting and fixing mechanism of the blind plate, and the force-applying end of the lifting mechanism is located above the lifting frame.

[0011] Remove the blind flange from the water intake pipe, and by pulling the force-applying end of the lifting mechanism, lift the blind flange from one side of the load-bearing beam upwards along the turning direction of the pulling force steering mechanism to the top of the load-bearing beam, and drag it along the top of the load-bearing beam into the preset platform to complete the removal of the blind flange from the water intake pipe.

[0012] Furthermore, in a preferred embodiment, the hoisting frame includes a support column and a frame disposed on top of the support column; wherein the bottom end of the support column is fixed to the bottom of the forebay of the water intake pumping station; and the frame is fixed above the observation port.

[0013] In addition, a preferred embodiment is that the construction of the hoisting frame at the observation port at the top of the water intake pumping station forebay includes: fixing the bottom of the support column to the bottom of the water intake pumping station forebay to obtain a pool bottom support structure; fixing and assembling the frame, and fixing the bottom of the fixedly assembled frame to the top of the pool bottom support structure to obtain the hoisting frame.

[0014] Furthermore, in a preferred embodiment, the support column is a round steel structure; the frame is welded from double H-beams; and the frame is fixed to the top of the support column by welding.

[0015] In addition, a preferred embodiment is that a column base plate is provided at the bottom of the support column; the number of support columns is at least four, and a bracing mechanism is provided between adjacent support columns.

[0016] Furthermore, in a preferred embodiment, the bracing mechanism is a channel steel; the bracing mechanism is fixed between the support columns by welding.

[0017] Furthermore, a preferred embodiment is that the pulling and steering mechanism is a steering pulley; and / or, the lifting mechanism is a chain hoist.

[0018] Furthermore, a preferred embodiment includes, before removing the blind flange from the water intake pipe:

[0019] Loosen the blind flange on the water intake pipe to allow water from the side to be intake to flow into the forebay of the water intake pumping station, so that the water level and pressure in the forebay are equal to those on the side to be intake.

[0020] Furthermore, a preferred embodiment is that during the process of removing the blind flange from the water intake pipe,

[0021] The blind flange is removed in the order of bottom to top, and the bolts used to fix the blind flange are transferred to the pre-set platform via a bucket.

[0022] After all the bolts on the blind flange are removed, the underwater workers relay the information to the staff above the pre-set platform via walkie-talkie.

[0023] Furthermore, a preferred embodiment involves pulling the lifting mechanism to lift the blind flange from one side of the load-bearing beam upwards along the direction of the pulling mechanism to the top of the load-bearing beam, and then dragging it along the top of the load-bearing beam into a preset platform, thus completing the removal of the blind flange from the water intake pipe.

[0024] The force-applying end of the lifting mechanism is fixed to the winch. The winch pulls the force-applying end of the lifting mechanism, causing the blind plate to be lifted from one side of the load-bearing beam along the turning direction of the force-directing mechanism to the top of the load-bearing beam. The blind plate is then dragged along the top of the load-bearing beam into a preset platform, thus completing the removal of the blind plate from the water intake pipe.

[0025] As can be seen from the above technical solution, the method for removing the blind flange of the water intake pipeline in the forebay of the water intake pumping station provided by the present invention involves first building a hoisting frame at the observation port at the top of the forebay of the water intake pumping station, fixing a load-bearing beam on the frame opening, and fixing a tension steering mechanism on the side wall of the load-bearing beam. This eliminates the need for a large number of machinery shifts, and only requires simple hoisting equipment or manpower to remove the disassembled blind flange from underwater. The hoisting frame can be reused multiple times, which not only saves a lot of machinery shifts and improves work efficiency, but also greatly reduces construction costs. The tension steering mechanism can better control the tension angle during the process of pulling the blind flange to the horizontal, ensuring high safety.

[0026] To achieve the foregoing and related objectives, one or more aspects of the invention include the features that will be described in detail below. The following description and accompanying drawings illustrate certain exemplary aspects of the invention. However, these aspects indicate only a few of the various ways in which the principles of the invention can be used. Furthermore, the invention is intended to encompass all such aspects and their equivalents. Attached Figure Description

[0027] Other objects and results of the invention will become more apparent and readily understood with reference to the following description taken in conjunction with the accompanying drawings. In the drawings:

[0028] Figure 1 A flowchart illustrating the method for removing the blind flange of the water intake pipeline in the forebay of a water intake pumping station according to an embodiment of the present invention;

[0029] Figure 2 A construction process diagram of the method for removing the blind flange of the water intake pipeline in the forebay of the water intake pumping station according to an embodiment of the present invention;

[0030] Figure 3 This is a top view of the hoisting frame according to an embodiment of the present invention;

[0031] Figure 4 This is a side view of the hoisting frame according to an embodiment of the present invention.

[0032] In the attached diagram, 1-observation port, 2-lifting frame, 21-frame opening, 22-support column, 221-column base plate, 222-bracing mechanism, 23-frame, 3-blind plate, 31-lifting fixing mechanism, 4-load-bearing beam, 5-tension steering mechanism, 6-lifting mechanism.

[0033] In all the accompanying drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed Implementation

[0034] In the following description, numerous specific details are set forth for illustrative purposes and to provide a thorough understanding of one or more embodiments. However, it will be apparent that these embodiments may also be implemented without these specific details.

[0035] To address the issues of high construction costs, the need for a large number of machine shifts, low efficiency, and low safety associated with the existing blind flange installation methods, which involve the distance between the installation equipment and the observation port, making it impossible to directly observe the installation process, a new method for removing blind flanges from the water intake pipeline of the forebay of a water intake pumping station is proposed.

[0036] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0037] To illustrate the method for removing the blind flange of the water intake pipeline in the forebay of the water intake pumping station provided by the present invention, Figure 1 The flowchart of a method for removing blind flanges from the water intake pipeline of a water intake pumping station forebay according to an embodiment of the present invention is shown. Figure 2 The construction process of a method for removing blind flanges from the water intake pipeline of a water intake pumping station forebay according to an embodiment of the present invention is shown. Figure 3 A top view of the hoisting frame according to an embodiment of the present invention is shown; Figure 4 The side structure of the hoisting frame according to an embodiment of the present invention is shown.

[0038] like Figures 1 to 4 As shown in the figure, the method for removing the blind flange of the water intake pipeline in the forebay of the water intake pumping station provided by the present invention includes the following steps:

[0039] S1. Construct a hoisting frame 2 at the observation port 1 at the top of the water intake pumping station forebay, so that the frame opening 21 of the hoisting frame 2 is located above the blind plate 3 of the water intake pipe, and the top of the hoisting frame 2 is higher than the height of the blind plate 3.

[0040] S2. Fix the load-bearing beam 4 on the frame opening 21 of the hoisting frame 2, and fix the tension steering mechanism 5 on the side wall of the load-bearing beam 4.

[0041] S3. The lifting mechanism 6 is arranged along the turning direction of the tension steering mechanism 5, so that the fixed end of the lifting mechanism 6 is fixed on the lifting fixing mechanism 31 of the blind plate 3, and the force-applying end of the lifting mechanism 6 is set above the lifting frame 2.

[0042] S4. Remove the blind flange 3 from the water intake pipe, and by pulling the force-applying end of the lifting mechanism 6, lift the blind flange 3 from one side of the load-bearing beam 4 upward along the turning direction of the pulling force steering mechanism 5 to the top of the load-bearing beam 4, and drag it along the top of the load-bearing beam 4 into the preset platform to complete the removal of the blind flange from the water intake pipe.

[0043] Among them, the hoisting and fixing mechanism 31 is a lifting ring, which is fixed to the blind plate 3 by welding.

[0044] By first constructing a hoisting frame 2 at the observation port 1 at the top of the intake pumping station's forebay, fixing a load-bearing beam 4 on the frame opening 21 of the hoisting frame 2, and fixing a tension steering mechanism 5 on the side wall of the load-bearing beam 4, a large number of machinery shifts are not required. The disassembled blind flange 3 can be removed from underwater with simple hoisting equipment or manpower. The hoisting frame can be reused multiple times, which not only saves a lot of machinery shifts and improves work efficiency, but also greatly reduces construction costs. The tension steering mechanism can better control the tension angle during the process of pulling the blind flange to the horizontal, ensuring high safety.

[0045] In a preferred embodiment of the present invention, the hoisting frame 2 includes a support column 22 and a frame 23 disposed on top of the support column 22; wherein, the bottom end of the support column 22 is fixed to the bottom of the forebay of the water intake pumping station; the frame is fixed above the observation port 1. The shape of the frame 23 is the same as the shape of the removed part of the observation port 1, generally rectangular; it is welded by a double H-beam structure; wherein, the double H-beam structure refers to a structure formed by welding the openings of two H-beams together. The support column 22 provides support for the frame 23. To ensure the strength of the double H-beam beam, it is necessary to weld the two H-beams side by side along the weldable edge at a 100mm interval at the upper and lower flange plates, then grind the weld seam smooth, and then cover the flange with a 16mm thick, 200*100mm steel plate and weld around it to ensure strength; the columns and the waist beams and braces are all welded along the weldable edge.

[0046] As a preferred embodiment of the present invention, the hoisting frame 2 is constructed at the observation port 1 at the top of the water intake pumping station forebay, comprising:

[0047] The bottom of the support column 22 is fixed to the bottom of the forebay of the water intake pumping station to obtain the bottom support structure of the pool.

[0048] The frame 23 is fixedly assembled, and the bottom of the fixedly assembled frame is fixed to the top of the pool bottom support structure to obtain the hoisting frame.

[0049] First, at observation port 1, a permanent or temporary hoisting frame 2 is erected; a double I-beam (I-40) wainscoting serves as the load-bearing beam 4, and the support columns 22 use seamless steel pipes of Φ273X8 as the frame columns. Tie rods and diagonal braces are made of No. 16 channel steel, welded together to form a stable frame structure. This can permanently avoid future annual maintenance or cleaning of the forebay. Large lifting equipment is required when installing or removing blind flanges when water tightness is needed. (The frame is slightly higher than the blind flange, about 4m; the length and width are slightly larger than the diameter of the blind flange, about 4m).

[0050] In a preferred embodiment of the present invention, the support column 22 is a round steel structure; the frame 23 is welded from double H-beams; the frame 23 is fixed to the top of the support column 22 by welding. This makes the overall structure more robust and durable.

[0051] As a preferred embodiment of the present invention, a column base plate 221 is provided at the bottom of the support column 22; there are at least four support columns 22, and a bracing mechanism 222 is provided between adjacent support columns 22. The column base plate 221 facilitates the fixation of the bottom of the support column 22 in the pool; the bracing mechanism 222 makes the support of the support column 22 more stable.

[0052] As a preferred embodiment of the present invention, the bracing mechanism 222 is a channel steel; the bracing mechanism 222 is fixed between the support columns 22 by welding.

[0053] In a preferred embodiment of the present invention, the tension steering mechanism 5 is a steering pulley; and / or, the lifting mechanism 6 is a chain hoist. After the hoisting frame 2 is fixed, a 10-ton chain hoist (double 10-ton chain hoists for safety) is hung from the underside of the load-bearing beam 4, and a 20-ton rope hook is pre-attached to the lifting ring of the lower blind plate, and the chain hoist is tightened. The steering pulley facilitates the turning of the blind plate 3, which is lifted from the bottom of the pool, to a horizontal position at the top of the load-bearing beam 4, making it easy to move to the preset platform.

[0054] As a preferred embodiment of the present invention, before removing the blind plate 3 from the water intake pipe, the method further includes: loosening the blind plate 3 on the water intake pipe, so that the water flow on the side to be taken into the forebay of the water intake pumping station, so that the water level and water pressure in the forebay of the water intake pumping station are equal to the water level and water pressure on the side to be taken.

[0055] Qualified divers, wearing appropriate equipment and protective gear, should enter the pool and slightly loosen the bolts on the lower side of the blind flange 3 to allow water to flow into the fore pool (personnel should quickly evacuate the fore pool). Once the water level in the pool is roughly equal to the water level on the river side and the water pressure is balanced, divers should then be sent underwater to remove the bolts on the blind flange.

[0056] As a preferred embodiment of the present invention, during the process of removing the blind flange 3 from the water intake pipe...

[0057] The blind flange 3 is removed from bottom to top, and the bolts used to fix the blind flange are transferred to the pre-set platform via a bucket.

[0058] After all the bolts on blind flange 3 were removed, the underwater workers relayed the information to the staff above the pre-set platform via walkie-talkie.

[0059] The dismantling sequence is from bottom to top. During the process, communication is maintained with personnel working on the pool top via underwater walkie-talkies using oxygen masks to prevent bolts and tools from being lost in the water. These can be passed through a bucket. This also prevents underwater personnel from being squeezed or collided with if the blind flange bolts loosen. After the underwater personnel have removed all the bolts from blind flange 3, they communicate with the land-based operations supervisor and slowly lift blind flange 3 using a chain hoist. At this point, the underwater personnel should leave the forebay before blind flange 3 emerges from the water. Once blind flange 3 is completely lifted above the forebay platform, it can be guided laterally onto the platform using a winch or chain hoist. At this point, the removal of blind flange 3 is complete. During annual maintenance or forebay cleaning, this procedure can be reversed to install blind flange 3 onto the water intake pipe end.

[0060] Underwater personnel communicate with those on top of the pool using underwater walkie-talkies, with a designated person in charge of command. Construction cannot proceed if communication is unclear. The bolt type is M52-180, with approximately 30 bolts per blind flange. If jamming or deformation occurs during removal, underwater cutting will be used. When cutting outwards, care must be taken to protect the blind flange base material. After the forebay is level with the river side, the water depth in the pool is approximately 10 meters. Edge protection must be in place at the hoisting opening on the pool top, and a designated safety person must be on-site to supervise. The hoisting frame, in coordination with professional underwater divers, communicates via underwater walkie-talkies, utilizing manual labor and chain hoists to complete the removal or installation of the blind flanges.

[0061] In a preferred embodiment of the present invention, by pulling the lifting mechanism 6, the blind plate 3 is lifted from one side of the load-bearing beam 4 upwards along the turning direction of the pulling mechanism 5 to the top of the load-bearing beam 4, and then dragged along the top of the load-bearing beam 4 into a preset platform, thus completing the removal of the blind plate 3 of the water intake pipe.

[0062] The force-applying end of the lifting mechanism 6 is fixed to the winch. By pulling the force-applying end of the lifting mechanism 6 with the winch, the blind flange 3 is lifted from one side of the load-bearing beam 4 along the turning direction of the tension steering mechanism 5 to the top of the load-bearing beam 4, and then dragged along the top of the load-bearing beam 4 into the preset platform, thus completing the removal of the blind flange of the water intake pipe. Using a winch saves manpower.

[0063] As can be seen from the above specific embodiments, the blind flange removal method for the water intake pipeline of the forebay of the water intake pumping station provided by the present invention first constructs a hoisting frame at the observation port at the top of the forebay of the water intake pumping station, fixes a load-bearing beam on the frame opening, and fixes a tension steering mechanism on the side wall of the load-bearing beam. This eliminates the need for a large number of machinery shifts. The disassembled blind flange can be removed from underwater with simple hoisting equipment or manpower. The hoisting frame can be reused multiple times, which not only saves a lot of machinery shifts and improves work efficiency, but also greatly reduces construction costs. The tension steering mechanism can better control the tension angle during the process of pulling the blind flange to the horizontal, resulting in high safety.

[0064] The method for removing the blind flange of the intake pipe in the forebay of a water intake pumping station according to the present invention has been described above by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various modifications can be made to the method for removing the blind flange of the intake pipe in the forebay of a water intake pumping station according to the present invention without departing from the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the contents of the appended claims.

Claims

1. A method for removing blind flanges from water intake pipes in the forebay of a water intake pumping station, characterized in that, Includes the following steps: A hoisting frame is erected at the observation port on the top of the water intake pumping station forebay, with the frame opening positioned above the blind flange of the water intake pipeline, and the top of the hoisting frame higher than the height of the blind flange. The hoisting frame includes a support column and a frame mounted on top of the support column. The bottom end of the support column is fixed to the bottom of the water intake pumping station forebay. The frame is fixed above the observation port. Erecting the hoisting frame at the observation port on the top of the water intake pumping station forebay includes: fixing the bottom of the support column to the bottom of the water intake pumping station forebay to obtain a pool bottom support structure; assembling the frame and fixing the bottom of the assembled frame to the top of the pool bottom support structure to obtain the hoisting frame. A load-bearing beam is fixed on the frame opening of the hoisting frame, and a tension steering mechanism is fixed on the side wall of the load-bearing beam. A lifting mechanism is arranged along the turning direction of the pulling steering mechanism, such that the fixed end of the lifting mechanism is fixed on the lifting and fixing mechanism of the blind plate, and the force-applying end of the lifting mechanism is located above the lifting frame. The blind flange is removed from the water intake pipe. By pulling the force-applying end of the lifting mechanism, the blind flange is lifted upwards from one side of the load-bearing beam along the direction of the pulling force steering mechanism to the top of the load-bearing beam. It is then dragged along the top of the load-bearing beam onto a preset platform, completing the removal of the blind flange from the water intake pipe. During the process of removing the blind flange from the water intake pipe... The blind flange is removed in the order of bottom to top, and the bolts used to fix the blind flange are transferred to the pre-set platform via a bucket. After all the bolts on the blind flange are removed, the underwater workers relay the information to the staff above the pre-set platform via walkie-talkie.

2. The method for removing the blind flange of the water intake pipeline in the forebay of the water intake pumping station according to claim 1, characterized in that, The support column is a round steel structure; The frame is welded from double H-beams; The frame is fixed to the top of the support column by welding.

3. The method for removing the blind flange of the water intake pipeline in the forebay of the water intake pumping station according to claim 2, characterized in that, A column base plate is provided at the bottom of the support column; The number of support columns is at least four, and a bracing mechanism is provided between adjacent support columns.

4. The method for removing the blind flange of the water intake pipeline in the forebay of the water intake pumping station according to claim 3, characterized in that, The bracing mechanism is made of channel steel; The bracing mechanism is fixed between the support columns by welding.

5. The method for removing the blind flange of the water intake pipeline in the forebay of the water intake pumping station according to claim 1, characterized in that, The force steering mechanism is a steering pulley; and / or, The lifting mechanism is a chain hoist.

6. The method for removing the blind flange of the water intake pipeline in the forebay of the water intake pumping station according to claim 1, characterized in that, Before removing the blind flange from the water intake pipe, the following are also included: Loosen the blind flange on the water intake pipe to allow water from the side to be intake to flow into the forebay of the water intake pumping station, so that the water level and pressure in the forebay are equal to those on the side to be intake.

7. The method for removing the blind flange of the water intake pipeline in the forebay of the water intake pumping station according to claim 1, characterized in that, By pulling the force-applying end of the lifting mechanism, the blind flange is lifted upwards from one side of the load-bearing beam along the turning direction of the pulling force steering mechanism to the top of the load-bearing beam, and then dragged along the top of the load-bearing beam into a preset platform, thus completing the removal of the blind flange of the water intake pipe. The force-applying end of the lifting mechanism is fixed to the winch. The winch pulls the force-applying end of the lifting mechanism, causing the blind plate to be lifted from one side of the load-bearing beam along the turning direction of the force-directing mechanism to the top of the load-bearing beam. The blind plate is then dragged along the top of the load-bearing beam into a preset platform, thus completing the removal of the blind plate from the water intake pipe.

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