Pontoon type pump station rocker arm water conveying pipe installation groove excavation method

Abstract

The invention relates to the technical field of pontoon pump station engineering, and discloses a pontoon type pump station rocker arm water conveying pipe installation groove excavation method which comprises the following steps that S1, according to the diameter and the module length of a steel rocker arm water conveying pipe; s2, first-time excavation is conducted on the construction bank slope, and a mechanical equipment operation platform is formed; s3, secondary excavation is conducted on the side, close to the water, of the mechanical equipment operation platform, and a groove working pit, a riding track and a buffer slope are synchronously formed; s4, foundation treatment is conducted; and S5, a new round of descending platform circulation excavation is carried out. According to the method, the technical problem that the relation between the excavation height of the platform and the water level is difficult to determine is solved, the vertical height of the surface of the mechanical equipment operation platform and the water level is controlled within a specific range, and the problems that hoisting operation is difficult and safety risks are increased due to the fact that the platform is too high are solved; and the conditions that the foundation is soaked by water level and the bearing capacity of the soil body is reduced due to the too low platform are also prevented.

Description

Technical Field

[0001] This invention relates to the field of floating pump station engineering technology, specifically a method for excavating grooves for installing water delivery pipes on the rocker arm of a floating pump station. Background Technology

[0002] A floating pumping station is a floating pumping station device that integrates pumping station functions and hull structure. Its steel water conveying rocker arm is an important structure connecting the floating vessel and the shore water conveying system. The stability of its installation platform and the safety of construction are of paramount importance. Traditionally, the installation platform of the rocker arm water conveying pipe is excavated in areas with flat terrain and stable foundations on the shore.

[0003] In steep terrains such as mountainous areas and reservoirs, floating pumping stations often need to be installed in areas with steep banks and significant water level fluctuations. Traditional excavation methods present several problems. If the excavation platform is too high, the vertical distance from the water surface is large, making crane lifting operations difficult and posing high safety risks. If the excavation platform is too low, the platform foundation is easily soaked by water, reducing the soil's bearing capacity and affecting the stability of the lifting equipment and construction safety. In addition, reservoir water levels often change with the seasons or scheduling, and traditional fixed-elevation platforms cannot adapt to water level drops, leading to worsening lifting conditions and even requiring relocation and excavation, increasing project costs and time. Based on this, the present invention designs a groove excavation method for installing the crane arm water delivery pipe of a floating pumping station to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a method for excavating grooves for installing water delivery pipes on the rocker arm of a floating pumping station, which solves the problem of changes in excavation platform height and water level in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A method for excavating a groove for installing a water delivery pipe on a rocker arm of a floating pump station includes the following steps:

[0007] Step S1: Determine the planar dimensions of the groove working pit based on the diameter of the steel rocker arm water supply pipe and the module length. The width of the groove working pit is 80cm greater than the diameter of the rocker arm water supply pipe.

[0008] Step S2: The first excavation is carried out on the construction bank slope to form a mechanical equipment operating platform. The planar dimensions of the mechanical equipment operating platform are 22.6m long and 10m to 12m wide, and the vertical height of its surface from the water surface is controlled to be 5m.

[0009] Step S3: A second excavation is carried out on the water-facing side of the mechanical equipment operating platform, simultaneously forming a recessed working pit, a walkway, and a buffer slope; wherein, the bottom excavation elevation of the recessed working pit is consistent with the top elevation of the universal joint on the floating pump station; the width of the walkway is 0.5m to 1.0m, and its length is the same as the length of the recessed working pit; the slope of the buffer slope is 1:1, and the top has a reserved vertical height of 0.7m;

[0010] Step S4: Perform foundation treatment, clean, compact, and reinforce the foundation of the mechanical equipment operating platform to ensure that its bearing capacity meets the requirement of 110.8 kPa.

[0011] Step S5: When the water level drops and the height difference between the surface of the mechanical equipment operating platform and the water surface exceeds 5m, the mechanical equipment is removed, and steps S2 to S4 are repeated to carry out a new round of platform lowering and cyclic excavation.

[0012] Preferably, in step S3, the construction accuracy control standard for the grooved working pit is as follows: axis position deviation ≤ 15mm, bottom size deviation +20mm to -50mm, top excavation line deviation ≤ 50mm, and pit bottom surface flatness with a height difference ≤ 50mm within a 2m range.

[0013] Preferably, in step S3, the bottom elevation of the groove working pit is determined and controlled in the following way: the top elevation of the flexible joint is calculated based on the water level of the day, the draft of the floating pump station platform (1.2m), the height of the platform body above water (0.8m), and the height of the universal joint (3.395m); the excavation depth is measured and controlled using RTK, total station, and level to make the bottom elevation of the pit consistent with the calculated elevation.

[0014] Preferably, in step S3, after the buffer slope is excavated and formed, it is repeatedly compacted using an excavator bucket without setting up additional support structures.

[0015] Preferably, in step S4, the foundation treatment specifically includes: removing debris, loose soil, and weak soil layers from the area of ​​the mechanical equipment operating platform; compacting the soft foundation with a road roller; if the foundation bearing capacity is insufficient, replacing the weak soil layer with crushed stone and gravel materials; and using a dynamic penetration test to verify the foundation bearing capacity.

[0016] The above technical solution demonstrates that the first excavation on the construction bank slope creates a 22.6-meter-long and 10-12-meter-wide platform for operating machinery. Precise measurements ensure the platform's vertical distance from the water surface is controlled at 5 meters. This height, verified through field practice, guarantees the safety of hoisting operations while preventing the platform from being too low and affected by the water level.

[0017] After the operating platform was formed, a second excavation operation was carried out. The bottom elevation of the trench working pit was determined through comprehensive calculations, including the water level of the day, the draft of the floating pump station (1.2 meters), the platform's height above water (0.8 meters), and the height of the universal joint (3.395 meters), ensuring that the bottom elevation of the pit was perfectly aligned with the top of the universal joint. Measurement control employed a combination of RTK, total station, and leveling instruments to ensure that the construction accuracy met the standard requirements of an axis position deviation of no more than 15 mm and a pit bottom flatness with a height difference of no more than 50 mm within a 2-meter range.

[0018] The walkway is set along the length of the working pit in the groove, with a width of 0.5 to 1.0 meters. It serves as an important passage connecting the top of the groove with the operating platform, and undertakes the transportation of construction personnel, materials, and small equipment. The buffer slope is trimmed at a 1:1 slope, with a 0.7-meter vertical height reserved at the top. After excavation, it is repeatedly compacted using an excavator bucket, which ensures stability and avoids the construction cost of additional support structures.

[0019] Preferably, during construction, an open ditch drainage system is installed at the bottom of the grooved working pit to allow accumulated water to flow into the reservoir by gravity; construction is prohibited on rainy days.

[0020] Preferably, in steps S2 and S5, the lifting equipment used is a 130t truck crane; each outrigger of the truck crane is covered with a steel plate with an area of ​​not less than 2m×2m, and the distance between the center of the outrigger and the edge of the groove working pit is not less than 2m.

[0021] Preferably, in step S5, the triggering condition for cyclic excavation is determined by water level monitoring; the water level monitoring frequency is twice a day; when the water level is in the condition of dropping 30cm to 40cm per day, the height difference between the surface of the mechanical equipment operating platform and the water surface is monitored in real time, and if the height difference is greater than 5m, cyclic excavation is triggered.

[0022] As can be seen from the above technical solution, the foundation treatment stage adopts a systematic operation process. First, debris and weak soil layers in the operating platform area are removed. Then, depending on the actual foundation conditions, measures such as compaction with a road roller or replacement with crushed stone and gravel are used to ensure that the foundation bearing capacity meets the design requirement of 110.8 kPa. During construction, an open ditch drainage system is set up at the bottom of the trench to drain accumulated water into the reservoir using the principle of gravity flow. Construction is prohibited on rainy days to ensure safety.

[0023] When the water level drops to a height difference of more than 5 meters between the platform and the water surface, the cyclic excavation mechanism is immediately activated. Water level monitoring is conducted twice daily. Combining data from the reservoir management unit and on-site RTK monitoring results, the system will automatically trigger equipment evacuation and restart the excavation process when a daily water level drop of 30 to 40 centimeters occurs.

[0024] Preferably, in step S3, the walkway is arranged along the length of the groove working pit to connect the top of the groove working pit with the mechanical equipment operating platform, serving as a passageway for construction personnel, materials, and small equipment.

[0025] Preferably, before the first excavation described in step S2 and before the new round of excavation triggered in step S5, a measurement and control step is included: first, an on-site measurement and control network is established, and RTK equipment is used for plane position and elevation control; the bottom elevation of the groove working pit, the elevation of the mechanical equipment operating platform, and the slope of the buffer slope are all laid out and monitored during the construction process based on the measurement and control network; the water level data comes from the real-time data of the reservoir management unit and the synchronous monitoring of the water surface elevation through on-site RTK equipment.

[0026] As can be seen from the above technical solution, before the first excavation in step S2 and before the new round of excavation after step S5 is triggered, a measurement and control step is included: First, an on-site measurement and control network is established, and RTK equipment is used to control the plane position and elevation; the bottom elevation of the trench working pit, the elevation of the mechanical equipment operating platform, and the slope of the buffer slope are all laid out and monitored during the construction process based on the measurement and control network; the water level data comes from the real-time data of the reservoir management unit and the synchronous monitoring of the water surface elevation through on-site RTK equipment.

[0027] The working principle of this invention is as follows: Before each excavation operation, a field measurement control network is first established, and RTK equipment is used to establish the plane position and elevation benchmark. This control network serves as the basis for all construction measurements, ensuring that the spatial relationship of structures such as the trench working pit, operating platform and buffer slope is accurate.

[0028] The elevation control of the recessed working pit employs a multi-parameter dynamic calculation method. Based on the measured water level data of the day, combined with the draft of the floating pump station platform (1.2 meters), its height above water (0.8 meters), and the height of the universal joint (3.395 meters), the top elevation of the universal joint is calculated in real time. Surveyors use a total station, level, and steel tape to conduct on-site layout, converting the calculated elevation into specific construction elevations, with errors controlled within millimeters.

[0029] Digital monitoring methods were introduced to control the construction quality of the buffer slope. When adjusting the slope to a 1:1 ratio, not only were traditional slope gauges used for verification, but RTK equipment was also employed to perform three-dimensional scanning of the slope profile, ensuring that the slope accuracy met design standards. The reserved 0.7-meter vertical height, calculated mechanically, ensures slope stability while providing a safe passage for construction personnel. The foundation bearing capacity verification employed a combination of dynamic penetration tests and numerical simulation. After foundation cleaning and compaction, penetration tests were conducted at multiple representative points. The test data was input into the analysis system in real time and compared with the design requirement of 110.8 kPa. Simultaneously, a foundation bearing capacity distribution model was established to predict settlement during use, providing safety assurance for hoisting operations.

[0030] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0031] 1. This invention solves the technical problem of the difficulty in determining the relationship between the platform excavation height and the water level. By controlling the vertical height between the surface of the mechanical equipment operating platform and the water surface within a specific range, it avoids the problems of hoisting difficulties and increased safety risks caused by the platform being too high, and also prevents the foundation from being soaked by water and the soil bearing capacity from decreasing due to the platform being too low, thereby improving the safety and reliability of the construction process.

[0032] 2. In this invention, by establishing a linkage mechanism between water level monitoring and cyclic excavation, the platform's step-down excavation process is automatically triggered when the water level drops to a set condition. This overcomes the problem of traditional fixed-elevation platforms being unable to adapt to changes in water level, which leads to deterioration of hoisting conditions. It also reduces the need for relocation and excavation due to changes in conditions, which is beneficial for controlling project costs and schedule. In addition, the process design of this method fully considers the special characteristics of mountainous areas, reservoir areas, and other terrains. Through modular construction processes and parameterized control standards, it provides a reference solution for the installation of water conservancy facilities in similar environments.

[0033] 3. In this invention, a layered excavation and composite structure collaborative construction method is adopted. By excavating in stages, mechanical equipment operating platforms, recessed working pits, walkways, and buffer slopes are formed, so that each structural element is formed step by step and supports each other. This optimizes the amount of earthwork while ensuring the rationality and feasibility of construction organization under complex terrain conditions. In addition, modern measurement and positioning technology is used to control the construction accuracy of key parts. Combined with standardized foundation treatment measures and drainage protection requirements, stable operating conditions are provided for large hoisting equipment. Appropriate technical measures are taken to ensure slope stability, achieving a balance between quality and safety goals. Attached Figure Description

[0034] Figure 1 This is a flowchart illustrating the overall method of the present invention;

[0035] Figure 2 This is a schematic diagram of the groove structure of the present invention;

[0036] Figure 3 This is a diagram of the water level monitoring and cyclic excavation triggering mechanism of the present invention. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0038] Example 1;

[0039] Please see Figures 1-3 A method for excavating a groove for installing a water delivery pipe on a rocker arm of a floating pumping station includes the following steps:

[0040] Step S1: Determine the planar dimensions of the groove working pit based on the diameter of the steel rocker arm water supply pipe and the module length. The width of the groove working pit is 80cm greater than the diameter of the rocker arm water supply pipe.

[0041] Step S2: The first excavation is carried out on the construction bank slope to form a mechanical equipment operation platform. The planar dimensions of the mechanical equipment operation platform are 22.6m long and 10m to 12m wide, and the vertical height of its surface from the water surface is controlled to be 5m.

[0042] Step S3: A second excavation is carried out on the water-facing side of the mechanical equipment operating platform, simultaneously forming a recessed working pit, a walkway, and a buffer slope; wherein, the bottom excavation elevation of the recessed working pit is consistent with the top elevation of the universal joint on the floating pump station; the width of the walkway is 0.5m to 1.0m, and its length is the same as the length of the recessed working pit; the slope of the buffer slope is 1:1, and the top of the slope has a reserved vertical height of 0.7m;

[0043] Step S4: Perform foundation treatment, clean, compact, and reinforce the foundation of the mechanical equipment operating platform to ensure that its bearing capacity meets the requirement of 110.8 kPa.

[0044] Step S5: When the water level drops and the height difference between the surface of the mechanical equipment operating platform and the water surface exceeds 5m, remove the mechanical equipment and repeat steps S2 to S4 to carry out a new round of platform lowering and cyclic excavation.

[0045] In step S3, the construction accuracy control standards for the grooved working pit are as follows: axis position deviation ≤ 15mm, bottom dimension deviation +20mm to -50mm, top excavation line deviation ≤ 50mm, and pit bottom surface flatness with a height difference ≤ 50mm within a 2m range.

[0046] In step S3, the bottom elevation of the working pit is determined and controlled in the following way: based on the water level of the day, the draft of the floating pump station platform (1.2m), the height of the main body of the platform above water (0.8m), and the height of the universal joint (3.395m), the top elevation of the joint is calculated; RTK, total station, and level are used to measure and set out and control the excavation depth so that the bottom elevation of the pit is consistent with the calculated elevation.

[0047] In step S3, after the buffer slope is excavated and formed, it is repeatedly compacted using an excavator bucket without setting up additional support structures.

[0048] In step S4, the foundation treatment specifically includes: removing debris, loose soil and weak soil layers in the area of ​​the mechanical equipment operating platform; compacting the soft foundation with a road roller; if the foundation bearing capacity is insufficient, replacing the weak soil layer with crushed stone and gravel materials; and using dynamic penetration testing to test the foundation bearing capacity.

[0049] During construction, an open ditch drainage system is set up at the bottom of the working pit to allow accumulated water to flow into the reservoir by gravity; construction is prohibited on rainy days.

[0050] The working principle of this invention is as follows: First, the planar dimensions of the groove working pit are determined based on the diameter of the steel rocker arm water pipe and the module length, ensuring that the groove width is 80 centimeters greater than the diameter of the water pipe to provide sufficient space for subsequent welding operations. Then, the first excavation is carried out on the construction bank slope, forming a mechanical equipment operating platform 22.6 meters long and 10 to 12 meters wide. The vertical height of the platform surface above the water surface is precisely controlled at 5 meters. This height has been verified in field practice to ensure the safety of the hoisting operation and prevent the platform from being affected by the water level due to being too low.

[0051] After the operating platform was formed, a second excavation operation was carried out. This excavation simultaneously created three key structures: a recessed working pit, a walkway, and a buffer slope. The bottom elevation of the recessed working pit was determined through comprehensive calculations, including the daily water level, the draft of the floating pump station (1.2 meters), the platform's height above water (0.8 meters), and the height of the universal joint (3.395 meters), ensuring complete alignment between the pit bottom elevation and the top of the universal joint. Measurement control employed a combination of RTK, total station, and leveling instruments to ensure construction accuracy met the standard requirements of an axis position deviation not exceeding 15 mm and a pit bottom flatness with a height difference not exceeding 50 mm within a 2-meter range.

[0052] The walkway is set along the length of the working pit in the groove, with a width of 0.5 to 1.0 meters. It serves as an important passage connecting the top of the groove with the operating platform, and undertakes the transportation of construction personnel, materials, and small equipment. The buffer slope is trimmed at a 1:1 slope, with a 0.7-meter vertical height reserved at the top. After excavation, it is repeatedly compacted using an excavator bucket, which ensures stability and avoids the construction cost of additional support structures.

[0053] The foundation treatment phase employs a systematic work process. First, debris and weak soil layers in the operating platform area are removed. Then, depending on the actual foundation conditions, measures such as compaction with a road roller or replacement with crushed stone and gravel are used to ensure the foundation bearing capacity meets the design requirement of 110.8 kPa. During construction, an open ditch drainage system is installed at the bottom of the trench to drain accumulated water into the reservoir using gravity flow. Construction is prohibited on rainy days to ensure safety.

[0054] When the water level drops to a height difference of more than 5 meters between the platform and the water surface, the cyclic excavation mechanism is immediately activated. Water level monitoring is conducted twice daily. Combining data from the reservoir management unit and on-site RTK monitoring results, the system will automatically trigger equipment evacuation and restart the excavation process when a daily water level drop of 30 to 40 centimeters occurs.

[0055] Example 2;

[0056] Please see Figures 1-3 In this embodiment of the invention, in steps S2 and S5, the hoisting equipment used is a 130t truck crane; a steel plate with an area of ​​not less than 2m×2m is laid under each outrigger of the truck crane, and the distance between the center of the outrigger and the edge of the groove working pit is not less than 2m.

[0057] In step S5, the triggering condition for cyclic excavation is determined by water level monitoring; the water level monitoring frequency is twice a day; when the water level is in the condition of dropping 30cm to 40cm per day, the height difference between the surface of the mechanical equipment operating platform and the water surface is monitored in real time. If the height difference is greater than 5m, cyclic excavation is triggered.

[0058] In step S3, the walkway is arranged along the length of the groove working pit to connect the top of the groove working pit with the mechanical equipment operating platform, serving as a passage for construction personnel, materials, and small equipment.

[0059] The working principle of this invention is as follows: During the excavation and cyclic excavation processes of the mechanical equipment operating platform, a 130-ton truck crane is used as the core lifting equipment. The truck crane has a total weight of 119 tons, including 54.8 tons of its own weight, 50.2 tons of counterweight, and 14 tons of lifting capacity. A steel plate of no less than 2 meters × 2 meters is laid under each outrigger to distribute the load, while ensuring that the center of the outrigger maintains a safe distance of more than 2 meters from the edge of the groove working pit, effectively preventing the risk of slope instability.

[0060] As a key auxiliary facility, the walkway is designed with the construction process in mind. The walkway, running the entire length of the recessed working pit, not only provides access for personnel and materials but also serves as a safety buffer zone for hoisting operations. Its width of 0.5 to 1.0 meters meets usage requirements while minimizing earthwork excavation.

[0061] The water level monitoring system employs a dual-source data verification mechanism. On one hand, it receives real-time water level data from the reservoir management unit; on the other hand, it simultaneously monitors the water surface elevation using on-site RTK equipment. The monitoring frequency is set twice daily, once in the morning and once in the evening. When a typical working condition of a daily water level drop of 30 to 40 centimeters is detected, the system calculates the height difference between the platform and the water surface in real time. Once the height difference exceeds a safety threshold of 5 meters, a cyclic excavation procedure is immediately triggered. This threshold is an optimized value derived from the structural parameters of the floating pump station and extensive field practice, ensuring timely adjustments before hoisting conditions deteriorate.

[0062] The cyclic excavation process emphasizes seamless workflow. First, a 130-ton truck crane lifts the boom module to a safe area, followed by platform elevation adjustment and excavation. The excavation depth is strictly controlled at 5 meters from the new water level. The recessed working pit is excavated a second time according to standard dimensions of 1 meter depth, 10 meters length, and 3 meters width. The entire process follows the principle of measurement first, using RTK equipment to control the elevation and ensure precise positioning of all structural dimensions.

[0063] Example 3;

[0064] Please see Figures 1-3 In this embodiment of the invention, before the first excavation in step S2 and before the new round of excavation triggered in step S5, a measurement and control step is included: first, an on-site measurement and control network is established, and RTK equipment is used for plane position and elevation control; the bottom elevation of the trench working pit, the elevation of the mechanical equipment operating platform, and the slope of the buffer slope are all laid out and monitored during the construction process based on the measurement and control network; the water level data comes from the real-time data of the reservoir management unit and the synchronous monitoring of the water surface elevation through on-site RTK equipment.

[0065] The working principle of this invention is as follows: Before each excavation operation, a field measurement control network is first established, and RTK equipment is used to establish the horizontal position and elevation benchmarks. This control network serves as the basis for all construction surveys, ensuring the accurate spatial relationships of structures such as the trench working pit, operating platform, and buffer slope.

[0066] The elevation control of the recessed working pit employs a multi-parameter dynamic calculation method. Based on the measured water level data of the day, combined with the draft of the floating pump station platform (1.2 meters), its height above water (0.8 meters), and the height of the universal joint (3.395 meters), the top elevation of the universal joint is calculated in real time. Surveyors use a total station, level, and steel tape to conduct on-site layout, converting the calculated elevation into specific construction elevations, with errors controlled within millimeters.

[0067] Digital monitoring methods were introduced to control the construction quality of the buffer slope. When adjusting the slope to a 1:1 ratio, not only were traditional slope rulers used for verification, but RTK equipment was also used to perform three-dimensional scanning of the slope profile to ensure that the slope accuracy met the design standards. The reserved 0.7-meter vertical height was calculated mechanically to ensure slope stability and provide a safe passage for construction personnel.

[0068] The foundation bearing capacity verification adopted a combination of dynamic penetration tests and numerical simulation. After the foundation cleaning and compaction were completed, penetration tests were conducted at several representative points. The test data were input into the analysis system in real time and compared with the design requirement of 110.8 kPa. At the same time, a foundation bearing capacity distribution model was established to predict the settlement during use and provide safety assurance for hoisting operations.

[0069] The water level monitoring data undergoes a multi-verification system. In addition to the regular reservoir unit data and RTK monitoring results, manual observation points are also set up for data comparison. This multi-source data fusion method effectively eliminates single-point measurement errors, provides a reliable basis for triggering cyclic excavation, and the measurement data is updated daily to generate monitoring reports, guiding the formulation and implementation of construction decisions.

[0070] Working Principle: This application solves the technical challenge of installing the rocker arm water delivery pipe of a floating pumping station on a steep bank slope through a systematic approach combining layered excavation, dynamic adaptation to water level changes, and precise measurement and control. The technical solution first determines the planar dimensions of the recessed working pit based on the water delivery pipe size, then excavates in two stages: the first stage creates a mechanical equipment operating platform with a strictly controlled vertical height of 5 meters above the water surface; this height has been proven in practice to optimally balance hoisting safety and foundation stability. The second stage simultaneously excavates the recessed working pit, walkway, and buffer slope. The elevation of the bottom of the recess is precisely aligned with the flexible joint by comprehensively calculating parameters such as the daily water level, the floating vessel's draft, and the joint height.

[0071] The technical solution of this application includes establishing a dynamic cyclic excavation mechanism. Through twice-daily water level monitoring, when the height difference between the platform and the water surface exceeds 5 meters, the platform is automatically lowered and the excavation process restarts, ensuring that installation conditions always adapt to water level changes. A precision measurement and control system uses RTK, total station, and other equipment to establish a measurement network, achieving millimeter-level precision control over axis position, pit bottom flatness, and slope gradient. Simultaneously, foundation replacement and compaction ensure a bearing capacity of 110.8 kPa, meeting the requirements of a 130-ton truck crane. Safeguard measures such as open ditch drainage and prohibition of construction during rainy weather are implemented, forming a complete safe operation system.

[0072] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for excavating a rocker arm water delivery pipe mounting groove of a floating pontoon type pump station, characterized in that, The method comprises the following steps: Step S1, according to the diameter of the steel rocker arm water pipe and the module length, the plan size of the groove working pit is determined, the width of the groove working pit is greater than the diameter of the rocker arm water pipe by 80 cm; Step S2, the first excavation is carried out on the construction bank slope to form a mechanical equipment operation platform, the plan size of the mechanical equipment operation platform is 22.6 m long and 10 m to 12 m wide, and the vertical height of the surface from the water surface is controlled to be 5 m; Step S3, the second excavation is carried out on the water side of the mechanical equipment operation platform to synchronously form a groove working pit, a horse path and a buffer slope; wherein the bottom elevation of the groove working pit is consistent with the top elevation of the universal joint of the floating ship pump station; the width of the horse path is 0.5 m to 1.0 m, and the length is the same as that of the groove working pit; the buffer slope is modified to have a slope of 1:1, and the vertical height reserved at the top is 0.7 m; Step S4, the foundation treatment is carried out to clean, compact and replace and reinforce the foundation of the mechanical equipment operation platform so that the bearing capacity meets the requirement of 110.8 kPa; Step S5, when the difference between the surface of the mechanical equipment operation platform and the water surface caused by the water level drop is greater than 5 m, the mechanical equipment is removed, and a new round of platform lowering cycle excavation is carried out by repeating steps S2 to S4.

2. The excavating method of the rocker arm water delivery pipe mounting groove of a floating pump station according to claim 1, characterized in that, In step S3, the construction precision control standard of the groove working pit is that the axis position deviation is less than or equal to 15 mm, the bottom size deviation is +20 mm to -50 mm, the top excavation line deviation is less than or equal to 50 mm, and the pit bottom surface flatness difference is less than or equal to 50 mm within a range of 2 m.

3. The excavating method of a rocker arm water delivery pipe mounting groove of a floating pump station according to claim 1, characterized in that, In step S3, the bottom elevation of the groove working pit is determined and controlled by the following method: the top elevation of the universal joint is calculated according to the water level of the day, the platform draft depth of the floating ship pump station of 1.2 m, the water height of the platform body of 0.8 m and the universal joint height of 3.395 m; the RTK, total station and level are used for measurement and sampling and control of the excavation depth so that the pit bottom elevation is consistent with the calculated elevation.

4. The excavating method of the rocker arm water delivery pipe mounting groove of a floating pump station according to claim 1, characterized in that: In step S3, after the buffer slope is excavated and formed, the excavator bucket is used for repeated compaction, and no additional supporting structure is arranged.

5. The method of claim 1, wherein, In step S4, the foundation treatment specifically includes: removing sundries, floating soil and soft soil layer in the area of the mechanical equipment operation platform; the soft foundation is compacted by the road roller; if the foundation bearing capacity is insufficient, the soft soil layer is replaced with gravel and sand and pebble materials by the replacement method; the foundation bearing capacity acceptance is detected by the dynamic sounding test.

6. The method of claim 1, wherein: In the construction process, a open ditch drainage system is arranged at the bottom of the groove working pit to make the accumulated water flow into the reservoir by gravity; construction is prohibited in rainy days.

7. The method of claim 1, wherein: In steps S2 and S5, the hoisting equipment used is a 130 t truck crane; a steel plate with an area of not less than 2 m*2 m is laid under each leg of the truck crane, and the distance from the center of the leg to the edge of the groove working pit is not less than 2 m.

8. The excavating method of a rocker pipe installation groove of a floating pump station rocker according to claim 1, characterized in that: In step S5, the triggering condition of cyclic excavation is determined by water level monitoring; the frequency of water level monitoring is twice a day; when the water level is in the condition of daily decrease of 30-40 cm, the height difference between the surface of the mechanical equipment operation platform and the water surface is monitored in real time, and if the height difference is greater than 5 m, the cyclic excavation is triggered.

9. The method of claim 1, wherein: In step S3, the horse path is arranged along the length direction of the groove working pit, used for connecting the top of the groove working pit and the mechanical equipment operation platform, as a passageway for construction personnel, materials and small equipment.

10. The method of claim 1, wherein, Before the first excavation in step S2 and before the new round of excavation after the triggering in step S5, a measurement control step is included: first, a field measurement control network is established, and the plane position and elevation control are performed by using an RTK device; the bottom elevation of the groove working pit, the elevation of the mechanical equipment operation platform and the slope of the buffer side slope are all laid out and monitored during the construction process according to the measurement control network; the water level data is derived from the real-time data of the reservoir management unit and the synchronous monitoring of the water surface elevation by the field RTK device.

Images