Installation construction process of large-diameter flood control mixed-flow pump

Abstract

The application relates to the technical field of mixed-flow pump installation methods, in particular to a large-diameter flood control mixed-flow pump installation construction process, which comprises the following steps: construction preparation, selecting a suitable pump station address and foundation design; pre-embedded part installation, setting pre-embedded parts at each part of a pump house main body bottom plate, a top plate and a wall body; well shaft installation, fixing an upper well shaft and a lower well shaft on the pre-embedded parts; segmented and split type mixed-flow pump installation, designing the mixed-flow pump into several sections, separately hoisting each section in the process of installing the mixed-flow pump, and installing the mixed-flow pump on the upper well shaft and the lower well shaft; test detection, performing interlocking test on the installed several mixed-flow pumps, first performing test on each pump, and then performing test on two pumps in combination; water test, performing closed water test and backflow test on each pump through a three-way check valve. The application has the effect of avoiding the problem of insufficient hoisting height caused by the large volume of the mixed-flow pump in the process of installing the mixed-flow pump.

Description

Technical Field

[0001] This application relates to the field of mixed-flow pump installation technology, and in particular to an installation and construction process for a large-diameter flood control mixed-flow pump. Background Technology

[0002] Large-scale pumping stations are crucial facilities in water conservancy projects, primarily used for water level regulation, irrigation, drainage, and power generation. They effectively improve agricultural production conditions, enhance water resource utilization efficiency, and promote regional economic development. They also serve multiple purposes, including flood control, drought relief, and improvement of the aquatic ecological environment. Furthermore, large-scale pumping stations are an important component of the national energy strategy, playing a vital role in ensuring national energy security. Therefore, the role and significance of large-scale pumping stations cannot be underestimated.

[0003] With the continuous expansion of urban areas, the pressure of flood control is also increasing. The state has invested a large amount of funds in municipal construction and renovation to improve urban flooding and drainage problems in mountainous areas. Specially designed large-diameter submersible mixed-flow pumps are often installed in large pumping stations. However, the construction of the main pump house inevitably overlaps with the installation of large equipment. Currently, mixed-flow pumps are usually installed in an integrated manner. Due to the large size of mixed-flow pumps, when the height of the pump shaft is high, the existing installation method cannot meet the lifting height requirements and needs improvement. Summary of the Invention

[0004] To reduce the impact of lifting height limitations on the installation of mixed-flow pumps and improve the ease of installation, this application provides an installation and construction process for a large-diameter flood control mixed-flow pump.

[0005] This application provides an installation and construction process for a large-diameter flood control mixed-flow pump, which adopts the following technical solution: An installation and construction process for a large-diameter flood control mixed-flow pump includes the following steps: Construction preparation, including selecting a suitable pumping station site and foundation design; Embedded parts are installed in each part of the pump house main structure, including the base plate, top plate, and walls. The installation of the well casing involves fixing the upper and lower well casings to the embedded parts; The mixed flow pump is installed in sections and in separate parts. The mixed flow pump is designed into several sections. During the installation process, each section is hoisted separately and the mixed flow pump is installed on the upper and lower wellbore. Testing and inspection: Interlocking tests were conducted on several installed mixed-flow pumps, first testing them one by one, and then testing them in pairs. The water test was conducted by using a three-way check valve to perform a water tightness test and a backflow test on each unit.

[0006] By adopting the above technical solution, before construction, it is necessary to select a suitable pump station site and design the foundation (including foundation treatment, foundation type selection, and foundation size determination). Embedded parts are installed at the locations where equipment needs to be fixed inside the pump house. The upper and lower shafts are fixed using these embedded parts. The mixed-flow pumps are customized, transported, and installed in sections, reducing the impact of overlapping construction and minimizing the possibility of limited lifting height due to the large size of the mixed-flow pumps. After installation, each mixed-flow pump is tested, followed by tests on pairs of pumps. Finally, water tightness and backflow tests are conducted on the mixed-flow pumps, thereby improving the installation's qualification. The segmented design of the mixed-flow pumps facilitates hoisting by workers and reduces the problem of insufficient lifting height due to the large size of the pumps.

[0007] Optionally, during the installation of the well casing, the lower well casing is hoisted to the edge of the wellhead on the top plate of the pump station, and then the lower well casing is hoisted a second time, one by one, to the reserved position on the bottom plate of the pump house.

[0008] By adopting the above technical solution, the lower shaft is first hoisted to the edge of the wellhead on the top plate of the pump station, and then hoisted a second time to the reserved position, which makes it easier to determine the reserved position in the pump room, thus making the installation of the lower shaft more accurate.

[0009] Optionally, during the installation of the well casing, the upper well casing is first fixed with two pre-embedded parts, and the lower well casing is fixed with two pre-embedded parts. The elevation, horizontal position and sealing are then re-measured and checked.

[0010] By adopting the above technical solution, the upper and lower well casings are pre-fixed and positioned using two embedded parts, which facilitates the staff to re-inspect the upper and lower well casings. After the inspection is completed, it is easy to remove the upper and lower well casings and re-fix them.

[0011] Optionally, after completing the inspection of the upper and lower well casings, loosen the pre-embedded anchor parts that have been fixed, hoist the entire well casing, lay out the lines with a level instrument, fix the entire well casing, and fix the water outlet pipe of the well casing.

[0012] By adopting the above technical solution, after the inspection is completed, the upper and lower well casings are re-fixed. By using a level to lay out the lines, the fixed positions of the upper and lower well casings are made more accurate. The water outlet pipe of the well casing is fixed, thereby making the fixation more stable and reducing the impact of water flow on the water outlet pipe.

[0013] Optionally, the elevation, horizontal position, and sealing of the connection between the well shaft and the well shaft outlet pipe are re-measured in sequence. After the inspection is completed, the connection is fixed using pre-embedded parts.

[0014] By adopting the above technical solution, the well casing is re-tested during the installation of the upper and lower well casings. After all indicators pass the test, the well casing is fixed by embedded parts, thereby reducing the possibility of errors during the fixing of the well casing.

[0015] Optionally, before pouring the main roof slab of the pump house, measure the elevation and horizontal coordinates of the pump opening under the roof slab to ensure that the coordinates of the roof opening and the base of the foundation slab are consistent.

[0016] By adopting the above technical solution, measurements are taken before pouring the main body of the pump house to better align the coordinates of the top slab opening and the bottom slab base, making the position setting of the top slab more accurate.

[0017] Optionally, the location of the well reinforcement support can be measured before the main water outlet side wall of the pump house is poured, so as to make the elevation and horizontal position more accurate.

[0018] Optionally, during the main civil construction of the pump station, tracking measurements can be started, the measurement locations can be marked appropriately, and records can be kept.

[0019] By adopting the above technical solutions, tracking and detection can reduce errors during construction. Marking during measurement makes it easier for staff to track the construction process and make timely improvements to any construction problems that occur.

[0020] Optionally, the pump can be hoisted into the wellbore, taking care to ensure the pump is lifted smoothly, and then lowered by intermittent rotation.

[0021] By adopting the above technical solution, the possibility of the pump frame hitting the side wall of the anti-rotation block during the pump installation process is avoided, thus making the pump installation more stable and smoother.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Large mixed-flow pumps adopt a segmented design and are installed in segments. This reduces the limitation on the lifting height of the mixed-flow pump due to its large size, and reduces the requirements for lifting height and weight, thus making the installation of the mixed-flow pump more convenient.

[0023] 2. The segmented design and installation method offers greater flexibility, allowing for horizontal or vertical installation to adapt to different site conditions and saving installation time for staff.

[0024] 3. Mixed-flow pumps have a large flow rate, which can meet the needs of different working conditions; mixed-flow pumps have high efficiency, which can increase the proportion of electrical energy converted into fluid energy, thereby reducing energy consumption. Attached Figure Description

[0025] Figure 1 This is a flowchart of the mixed-flow pump installation and construction process in the embodiments of this application.

[0026] Figure 2 This is a schematic diagram of the mixed-flow pump installed in the pump house in an embodiment of this application.

[0027] Reference numerals: 1. Mixed flow pump; 2. Three-way check valve. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0029] This application discloses an installation and construction process for a large-diameter flood control mixed-flow pump.

[0030] During actual construction, compared with the original design of the integrated large mixed-flow pump 1, the shaft height was 12.9 meters, and the distance between the bridge crane and the top plate was 8.1 meters, which could not meet the lifting height requirements. After dividing the shaft into sections, the lower part was 6.45 meters and the upper part was 6.45 meters, which met the lifting requirements. The integrated mixed-flow pump 1 weighed 25 tons, and the maximum lifting load of the bridge crane was 21 tons, which could not meet the lifting requirements. After being divided into sections, the weights were 4.95 tons, 5.25 tons, 13 tons, and 1.8 tons respectively, which met the lifting requirements.

[0031] Reference Figure 1 A construction process for installing a large-diameter flood control mixed-flow pump includes the following steps: Construction preparation and pump station site selection: When selecting a pump station site, factors such as geological conditions, topography, construction difficulty, and operation and maintenance should be considered first. Generally, pump stations should be built in areas with higher elevations and better geological conditions to reduce the impact of natural disasters such as floods. In addition, the location of the pump station should also consider the distance from the water source and the water receiving area, as well as the surrounding traffic conditions.

[0032] Foundation design is a crucial step in pump station construction, primarily encompassing ground treatment, foundation type selection, and foundation size determination. During foundation design, the geological survey report and recommendations should be fully considered to select an appropriate foundation type and size. Simultaneously, the elevation of the pump station foundation and the location of pre-reserved openings should be determined based on the performance requirements of the pump station equipment.

[0033] Pre-construction measurements are taken during the construction of the main civil engineering works of the pump station, and records and annotations are made to facilitate data tracking by staff, minimize measurement errors, and make the installation positions of the well shaft and the main body more accurate.

[0034] Based on the comparison of the design drawings and the equipment drawings of the mixed flow pump 1 manufacturer, and in accordance with the actual site construction plan, the elevation and horizontal coordinates of the base plate at the installation location of the mixed flow pump 1 were checked and measured to make the installation of the mixed flow pump 1 more accurate.

[0035] Before pouring the main wall of the pump house, the elevation and horizontal position of the 1.4-meter outlet pipe were measured, as well as the elevation and horizontal coordinates of the pump opening under the top plate, to ensure that the coordinates of the top plate opening and the bottom plate base are consistent. The position of the well reinforcement support was measured to ensure the accuracy of the elevation and horizontal position, so that the vibration force of the mixed flow pump 1 is uniform when it is started.

[0036] For the installation of embedded parts, the bolts, rivets, angle steel, and shim steel plates for the mixed-flow pump 1 are pre-embedded in place before the pouring of the main body base plate, top plate, and walls of the pump house. When the reserved opening in the design drawing does not match the dimensions of the equipment from the manufacturer, the opening in the pump house roof plate is modified after consultation among the three parties to allow the well shaft of the mixed-flow pump 1 to be effectively accessed.

[0037] Using a 130-ton truck crane and an installed bridge crane, eight lower shafts were lifted to the edge of shafts 1-8 on the top plate of the pump station. Then, the bridge crane was used for a second lifting, lifting each shaft one by one to the reserved position on the bottom plate of the pump house, which made the lifting of the lower shafts more convenient.

[0038] First, the lower well casing is fixed using two pre-embedded parts. Then, the upper well casing is hoisted and connected to the lower well casing. The elevation, horizontal position, and sealing are re-measured and checked. After passing the inspection, the pre-embedded bolts of the fixed anchor are loosened. The entire well casing is hoisted using a bridge crane. The lines are laid out using a laser level. The entire well casing is then connected and fixed to the outlet pipe flange at the well casing tee. The elevation, horizontal position, and sealing of the connection between the well casing and the outlet pipe are re-measured and checked. After the inspection is completed, the well casing is tightened to all the pre-embedded parts of the base plate.

[0039] Reference Figure 2 The mixed-flow pump 1 is designed in sections. In this application, the mixed-flow pump 1 is preferably divided into four sections. Eight mixed-flow pumps 1 are hoisted to the edge of wellheads 1-8 on the top plate of the pump station by a combination of a truck crane and an installed bridge crane. Then, the bridge crane is used for secondary hoisting, hoisting them one by one into the well shaft. After the mixed-flow pump 1 is installed in place, the pump pressure device is hoisted in place in sequence. The sealing of the embedded parts on the top plate, the pump pressure device, and the upper well shaft is checked. After the check is correct, all bolts are tightened.

[0040] Install 10KV branch boxes, high-voltage soft starter cabinets, high-voltage outgoing line cabinets and local control boxes; lay 10KV high-voltage cables to the high-voltage soft starter cabinets and high-voltage cabinets; lay low-voltage control lines for remote start / stop, temperature, vibration, water level and other functions to the PLC cabinet and the background PC control system.

[0041] The test involved interlocking experiments on eight large-diameter mixed-flow pumps 1 that had been installed. First, the mixed-flow pumps 1 were tested individually using computer-controlled remote operation, manual remote operation, and manual local operation. Then, combined experiments were conducted on (1#, 2#), (1#, 3#), (2#, 4#), (1-4#), (4-8#), and (1-8#).

[0042] Reference Figure 2 After a water test, a water tightness test and a backflow test were conducted on each of the mixed flow pump 1 and the three-way check valve 2 to reduce the possibility of problems occurring during actual operation.

[0043] The implementation principle of the installation and construction process of a large-diameter flood control mixed-flow pump in this application embodiment is as follows: After completing the pre-construction preparation, the designed four-section mixed-flow pump 1 is transported to the pump station, then the mixed-flow pump 1 is assembled, and then the well is fixed. The assembled mixed-flow pump 1 is fixed on the well, thereby realizing the installation of the mixed-flow pump 1. Since it is not necessary to directly hoist the completed mixed-flow pump 1 into the pump house, the hoisting of the mixed-flow pump 1 is avoided due to the large volume of the mixed-flow pump 1 and the high hoisting height requirement.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A construction process for installing a large-diameter flood control mixed-flow pump, characterized in that: Includes the following steps: Construction preparation, including selecting a suitable pumping station site and foundation design; Embedded parts are installed in the base slab, top slab, and walls of the pump house. The installation of the well casing involves fixing the upper and lower well casings to the embedded parts; The mixed flow pump (1) is installed in a segmented and separate manner. The mixed flow pump (1) is designed into several segments. During the installation of the mixed flow pump (1), each segment is hoisted separately and the mixed flow pump (1) is installed on the upper and lower wellbore. Test and inspection: A series of interlocking tests were conducted on several mixed-flow pumps (1) installed. First, each pump was tested individually, and then the pumps were tested in pairs. Water test: Each unit was tested for water tightness and backflow by using a three-way check valve (2); During the installation of the well casing, the upper well casing is first fixed with two embedded parts, and the lower well casing is fixed with two embedded parts. The elevation, horizontal position and sealing are then re-measured and checked. After completing the inspection of the upper and lower well casings, the pre-embedded anchor parts that have been fixed are loosened, the entire well casing is hoisted, the lines are laid out using a level instrument, the entire well casing is fixed, and the water outlet pipe of the well casing is fixed.

2. The installation and construction process of a large-diameter flood control mixed-flow pump according to claim 1, characterized in that: During the installation of the well casing, the lower well casing is hoisted to the edge of the wellhead on the top plate of the pump station, and then the lower well casing is hoisted a second time, one by one, to the reserved position on the bottom plate of the pump house.

3. The installation and construction process of a large-diameter flood control mixed-flow pump according to claim 2, characterized in that: The elevation, horizontal position, and sealing of the connection between the well shaft and the well outlet pipe were re-measured and checked in turn. After the checks were confirmed to be correct, the well shaft was fixed with embedded parts.

4. The installation and construction process of a large-diameter flood control mixed-flow pump according to claim 1, characterized in that: Before pouring the main roof slab of the pump house, measure the elevation and horizontal coordinates of the pump opening under the roof slab to ensure that the coordinates of the roof opening and the base of the foundation slab are consistent.

5. The installation and construction process of a large-diameter flood control mixed-flow pump according to claim 1, characterized in that: Before pouring the main water outlet side wall of the pump house, the position of the well reinforcement support was measured to make the elevation and horizontal position more accurate.

6. The installation and construction process of a large-diameter flood control mixed-flow pump according to claim 1, characterized in that: During the main civil construction of the pump station, tracking measurements were initiated, and the measured locations were properly marked and recorded.

7. The installation and construction process of a large-diameter flood control mixed-flow pump according to claim 1, characterized in that: Hoist the pump into the wellbore, ensuring its stability during lifting. Lower the pump by intermittently rotating it.

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