A Multi-Stage Pressurized Constant Pressure Pumping Method for Ultra-High-Rise Concrete

Abstract

This invention discloses a multi-stage pressurized constant-pressure pumping method for ultra-high-rise concrete, comprising: placing a concrete feeder on the ground, sequentially connecting a delivery pipe and a grouting hose to the concrete feeder so that the grouting hose extends to the corresponding position of the high-rise building; activating the power component, pressure sensor, and speed sensor of each stage of the electromagnetic shaftless pump-driven multi-stage pressurization device, driving the corresponding pressurization component to rotate through the power component, adjusting the rotational speed of each stage of the pressurization component on the electromagnetic shaftless pump-driven multi-stage pressurization device using the monitoring data from the pressure sensor and speed sensor, and determining the length of the delivery pipe between the electromagnetic shaftless pump-driven multi-stage pressurization devices; the length of the delivery pipe between the electromagnetic shaftless pump-driven multi-stage pressurization devices needs to be calculated. The advantage of this invention is that it can calculate and determine the length of the delivery pipe between the electromagnetic shaftless pump-driven multi-stage pressurization devices when maintaining a constant pressure in the delivery pipe.

Description

Technical Field

[0001] This invention relates to the technical field of ultra-high-rise concrete pumping pipeline transportation, and in particular to a multi-stage pressurization constant pressure pumping method for ultra-high-rise concrete pumping. Background Technology

[0002] With the development of urban construction, the number of super high-rise buildings is increasing, and the challenges of vertical transportation of building materials in super high-rise construction are becoming increasingly severe. Besides the issue of concrete mix proportions, the main technical difficulties in pumping concrete in super high-rise buildings stem from the conveying capacity of the concrete pumping equipment and pipelines. When the building height reaches 300m or even 500m or more, concrete pumping becomes increasingly difficult. Furthermore, the construction of super high-rise buildings typically uses high-strength, high-performance concrete, and the increased strength of the concrete material further intensifies the challenges to the pumping system. If the pumping system is not properly configured during construction, pipe blockages are highly likely; or if the pumping pressure does not meet the height requirements, it will cause construction to stop and incur high costs. Therefore, the performance of the selected pumping equipment, the layout of the pumping system, and related operating procedures are crucial for achieving ultra-high pressure pumping.

[0003] Currently, there are few domestic methods for ultra-high pressure pumping, pumping systems are lacking, conventional pumping processes are imperfect, concrete pumping is uncontrollable, and incidents such as insufficient pumping pressure and pipe blockage are prone to occur during high-rise pumping. In conventional ultra-high-rise construction projects, ultra-high pressure pumps and relay pumping methods are usually used. For example, patent number CN 115680285A, "An Ultra-High-Rise Concrete Pumping System and Construction Method," uses an ultra-high pressure pump set to provide enormous pressure for pumping concrete. Regarding relay pumping methods and devices, patent number CN 111622779 A, ​​"A Pulse-type Pressure Compensation Long-Distance Concrete Conveying Device and Its Usage Method," arranges several pneumatic booster pumps at intervals on the conveying pipeline. The air outlet of the pneumatic booster pump is connected to the conveying pipeline to compensate for the pushing pressure lost by the concrete during conveying, so as to keep the concrete pressure in the entire conveying pipeline stable and realize long-distance concrete conveying. Patent number CN 103541550 A, "A Construction Pumping System for Steel Pipe Concrete in Super High-Rise Buildings," connects a high-pressure pump to the discharge port and a low-pressure pump to the pouring hose. The two concrete pumps relay each other to achieve the purpose of pumping in super high-rise buildings. Although existing technologies have solved some problems of insufficient pumping pressure and relay pumping of concrete in high-rise buildings, the following problems still exist: (1) For long-distance and ultra-high-rise pumping, the pressure of high-pressure pumps is high, the performance and cost of high-pressure pumps are high, the performance requirements of adjacent pressure pump pipelines are high, the equipment cost is increased, and the construction safety is low; (2) Traditional pressure pumps provide intermittent pumping pressure, which can easily cause blockage of the delivery pipeline; (3) Traditional pressure pumps have greater vibration and noise, which is not conducive to environmental protection; (4) Traditional pressure pumps cannot achieve multi-stage pressurization; (5) It is difficult to ensure stable pouring pressure in the pumping method of ultra-high-rise pouring, which affects the quality of pouring; (6) It is difficult to ensure constant pressure in the delivery pipeline in the pumping method of ultra-high-rise pouring, which causes pipeline blockage. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a multi-stage pressurization and constant-pressure pumping method for ultra-high-rise concrete. This method involves deploying multiple electromagnetic shaftless pump-driven multi-stage pressurization devices on the delivery pipe. The location of these devices on the high-rise building pumping delivery pipe is determined by ensuring the ratio of the inlet and outlet pressures of each device reaches a certain value. Each device has blades on its inner wall. Pressure sensors monitor pressure changes and determine the blade rotation speed in real time. Electromagnetic force drives the bladed steel cylinder to rotate, and the high-speed rotating blades provide pressure to the concrete, achieving the pressurization purpose and ensuring that the concrete pumping pressure remains constant in the delivery pipe, thus guaranteeing the construction quality of the pouring. Simultaneously, the electromagnetic shaftless pump-driven multi-stage pressurization device is connected to the delivery pipe through a buffer component to buffer the concrete pressure and pressurization impact load, ensuring the safety and stability of the delivery pipe.

[0005] The objective of this invention is achieved through the following technical solutions:

[0006] A method for multi-stage pressurized constant-pressure pumping of concrete in ultra-high-rise buildings, characterized in that the pumping method includes:

[0007] A concrete feeder is placed on the ground, and a delivery pipe and a grouting hose are connected to the concrete feeder in sequence so that the grouting hose extends to the corresponding location of the high-rise building.

[0008] The conveying pipe is equipped with an electromagnetic shaftless pump-driven multi-stage booster device, which includes a multi-stage booster assembly. The booster assembly includes a rotor assembly and a power assembly. The rotor assembly includes a steel cylinder, an annular slider, blades, and a permanent magnet. The annular slider is located at both ends of the steel cylinder. The blades are arranged circumferentially along the inner wall of the steel cylinder. The permanent magnet is arranged circumferentially along the outer wall of the steel cylinder. The rotating magnetic field generated by the power assembly drives the permanent magnet of the rotor assembly to rotate. The booster assembly is equipped with a pressure sensor and a speed sensor.

[0009] The power component, pressure sensor, and speed sensor of each stage of the electromagnetic shaftless pump-driven multi-stage booster device are activated. The power component drives the corresponding booster component to rotate. The rotational speed of each stage of the booster component is adjusted using the monitoring data from the pressure sensor and the speed sensor. The length of the delivery pipe between the electromagnetic shaftless pump-driven multi-stage booster devices is determined so that concrete can be pumped to the corresponding location of the high-rise building by the concrete mixer. The boosting value is determined by the monitoring data and is evenly distributed to each stage of the booster component to determine the rotational speed of each stage of the booster component. Calculations are required for the rotational speed of each stage of the booster component and the length of the delivery pipe between the electromagnetic shaftless pump-driven multi-stage booster devices.

[0010] The method for calculating the rotational speed of each stage of the booster assembly in the multi-stage booster device propelled by the electromagnetic shaftless pump includes:

[0011] Suppose that the conveying pipe is equipped with m electromagnetic shaftless pumps pushing multi-stage pressurization devices, the length of the electromagnetic shaftless pumps pushing multi-stage pressurization devices is ΔL, and there are j0 stages of pressurization components, j=1, 2, 3, …j…j0. Then the length of each stage of pressurization component is δ=ΔL / j0; the inner diameter of the pressurization components and the conveying pipe is d, the self-weight of the pumped concrete is γ, and g is the acceleration due to gravity.

[0012] The electromagnetic shaftless pump pushes a multi-stage booster device to pump concrete vertically upwards. The pressure loss Δp experienced by the concrete during pumping is determined by ΔpVc and Δp γ It consists of two parts, where Δp Vc It is the friction loss experienced by concrete as it flows within the pump pipe, including the resistance generated by the viscosity of the concrete and the frictional resistance generated by the flow of the concrete; Δp γ It is the pressure generated by the weight of concrete during vertical pumping, that is, the total pressure loss Δp of concrete pumped vertically upward in each stage of the booster assembly. FI for:

[0013] Δp FI =Δp Vc +Δp γ Formula 1;

[0014] If the pumped concrete is ordinary concrete, the pressure loss along the flow rate Δp per meter during vertical upward pumping is... Vcm for:

[0015]

[0016] In the formula: Δp Vcm d is the pressure loss per meter of concrete flowing in the vertical delivery pipe; d is the diameter of the concrete delivery pipe; K1 is the adhesion coefficient; K2 is the velocity coefficient; S1 is the concrete slump; t2 / t1 is the ratio of the switching time of the concrete pump distribution valve to the time of the piston pushing the concrete, which can be taken as 0.30 when the equipment performance is unknown; v m α is the average flow velocity of the concrete mixture in the conveying pipe; α is the ratio of radial pressure to axial pressure, which is 0.90 for ordinary concrete; β is the conversion factor, which is 3, 4, and 5 when d / 2 is 100, 125, and 150 mm respectively.

[0017] The pressure Δp generated per meter of concrete by its weight during vertical pumping γm for:

[0018] Δp γm =γ Equation 3;

[0019] Substituting Equations 2 and 3 into Equation 1, we can obtain the total pressure loss Δp of the concrete pumped vertically upward in each stage of the pressurization assembly. FI for:

[0020]

[0021] The pressure p generated by the j-th stage pressurization component on the pumped concrete w for:

[0022] p w =γv 2 / 2g=γ[v1 / (πnR / 30v0)] 2 / 2g Formula 5;

[0023] In the formula: v is the flow velocity provided to the concrete by the j-th stage pressurization component, v=v1 / (ωR / v0)=v1 / (πnR / 30v0); ω is the angular velocity of each stage pressurization component; n is the rotational speed; R is the blade radius; v0 is the blade tip velocity; v1 is the blade root velocity;

[0024] Assuming the electromagnetic shaftless pump pushes a multi-stage booster device, the required output concrete pressure is p. eh The axial pressure of the concrete entering the multi-stage booster device of the electromagnetic shaftless pump is p. s If the electromagnetic shaftless pump pushes a multi-stage booster device, and each stage of the booster distributes the boost value evenly, then the pressure p that each stage of the booster needs to provide is... w for:

[0025]

[0026] Equation 5 equals Equation 6, so we get the required output pressure p for recovery. eh At that time, the rotational speed n of each stage of the booster assembly is:

[0027]

[0028] The radial pressure p of the concrete at the inlet of the booster assembly is monitored by a pressure sensor. d For ordinary concrete, the radial pressure p of the concrete in the conveying pipeline d With axial pressure p s If the ratio α = 0.90, then the axial pressure p of the concrete entering the multi-stage booster device of the electromagnetic shaftless pump is... s =p d / α;

[0029] The axial pressure p of the concrete at the inlet of each stage of the booster unit is monitored by a pressure sensor inside the multi-stage booster unit propelled by an electromagnetic shaftless pump. s1 p s2 p s3 …p sj0 and the axial pressure p of the concrete at the outlet of the last stage booster assembly se ;

[0030] The concrete flow velocity v at the inlet of each stage of the booster unit is monitored by a velocity sensor inside the electromagnetic shaftless pump-driven multi-stage booster device. m1 v m2 v m3 …v mj0 and the concrete flow velocity v at the outlet of the last stage pressurization component e v e ==v mL ;

[0031] If the radius from the center of rotation to the blade tip is r0, and the radius from the center of rotation to the blade root is r1 = d / 2, then the blade tip rotation speed is v0 = πnr0 / 30, and the blade root rotation speed is v1 = πnr1 / 30. Substituting v0 and v1 into Equation 7, we can obtain the rotation speed n of the j-th stage booster assembly required to restore the required output pressure. j for:

[0032]

[0033] If the pumped concrete is high-strength concrete, the pressure loss along the flow rate Δp per meter during vertical upward pumping is... Vum for:

[0034] Δp Vcm =Δp Vum =0.015 + 0.057η (Equation 9);

[0035] In the formula: Δp Vum η is the pressure loss per meter of the high-strength concrete vertical conveying pipe; η is the plastic viscosity.

[0036] Combining equations 3, 4, 5, 6, and 9, for high-strength concrete, to restore the required output pressure, the rotational speed n of the j-th stage booster component... j for:

[0037]

[0038] The method for calculating the length of the delivery pipe between the electromagnetic shaftless pump and the multi-stage booster device includes:

[0039] When the concrete is pumped to the next electromagnetic shaftless pump pushing the multi-stage booster device, the concrete pressure loss is:

[0040]

[0041] In the formula: v mL The flow rate of the pressurized concrete delivered from the electromagnetic shaftless pump to the multi-stage pressurization device can be monitored by a velocity sensor or calculated using Equation 5, v. mL =v;

[0042] The required pressure during pouring is p. eh At that time, the pressure ps at the inlet of the multi-stage booster device driven by an electromagnetic shaftless pump is set. L The required pressure p during pouring eh The ratio is the constant pressure delivery ratio k = ps L / p eh Assume constant pressure delivery ratio When the pressure changes significantly within the delivery pipe, it indicates that the constant pressure delivery requirement cannot be met. Assuming a constant pressure delivery ratio k = 0.80, the concrete pressure loss Δp within the delivery pipe length between the multi-stage booster devices of the electromagnetic shaftless pump is calculated. L ≤(1-k)p eh ,Right now:

[0043]

[0044] The length L of the delivery pipe between the electromagnetic shaftless pump and the multi-stage booster unit is:

[0045]

[0046] The booster assembly also includes a cylindrical protective cover and a support end cover. The rotor assembly and the power assembly are both installed inside the cylindrical protective cover. The support end cover is located at both ends of the cylindrical protective cover. The cylindrical protective cover is provided with an annular groove that cooperates with the annular slider.

[0047] The power assembly includes a stator core, stator teeth, and coils. The stator core is arranged circumferentially along the cylindrical protective cover, the coils are installed inside the stator core, and the stator teeth are connected to the stator core.

[0048] The electromagnetic shaftless pump-driven multi-stage booster device also includes a buffer assembly and a connecting pipe, and the first-stage booster assembly and the last-stage booster assembly are both connected to the buffer assembly.

[0049] The buffer assembly includes an annular buffer seat, an annular buffer cavity disposed within the annular buffer seat, a plurality of buffer springs disposed along the circumferential direction of the annular buffer cavity, and an annular steel support connected at one end to the pressurization assembly. The other end of the annular steel support extends into the annular buffer cavity and is connected to an annular steel pad. The annular steel pad contacts or is connected to the buffer springs corresponding to those in the annular buffer cavity.

[0050] The annular buffer seat is composed of an inner cylindrical buffer steel plate, an outer cylindrical buffer steel plate, an annular buffer base plate, and an annular steel clamping plate. The annular steel clamping plate has an annular groove that communicates with the annular buffer cavity. The annular groove has a smaller ring width than the annular buffer cavity, and the annular steel pad has a larger ring width than the annular groove.

[0051] The pressure sensor is arranged circumferentially along the inner side of the support end cover, and each speed sensor is located between two adjacent pressure sensors.

[0052] The advantages of this invention are:

[0053] (1) Reduce the initial pumping pressure of high-rise buildings to ensure construction safety, while reducing the pressure requirements of pumping equipment and the strength requirements of delivery pipes to reduce equipment cost investment;

[0054] (2) The electromagnetic shaftless pump pusher multi-stage booster device can increase the pumping height of the pumped concrete.

[0055] (3) The electromagnetic shaftless pump pusher has a large internal space in the pipeline, which is beneficial for pumping concrete.

[0056] (4) The series-connected multi-stage booster assembly can achieve multiple boosting operations;

[0057] (5) The length of the delivery pipe between the electromagnetic shaftless pump and the multi-stage booster device can be calculated and determined when the delivery pipe is kept under constant pressure.

[0058] (6) Monitor the concrete pump inlet pressure at all times and adjust the speed of the electromagnetic shaftless pump multi-stage booster device in real time to save energy and reduce emissions.

[0059] (7) Monitor the outlet pressure of the electromagnetic shaftless pump-driven multi-stage booster device at all times, and adjust the blade speed in a cyclical manner to ensure that the pressure meets the requirements and is stable.

[0060] (8) Adding an electromagnetic shaftless pump to the hose can ensure that the pouring pressure meets the requirements and make the poured concrete more compact. Attached Figure Description

[0061] Figure 1 This is a schematic diagram of the present invention;

[0062] Figure 2 This is a schematic diagram of the electromagnetic shaftless pump-driven multi-stage booster device of the present invention;

[0063] Figure 3 This is a schematic cross-sectional view of the electromagnetic shaftless pump-driven multi-stage booster device of the present invention.

[0064] Figure 4 This is a circuit diagram of the control system of the present invention;

[0065] Figure 5 for Figure 3 Cross-sectional view of AA in the middle;

[0066] Figure 6 for Figure 3 Cross-sectional view of BB in the middle;

[0067] Figure 7 for Figure 3 Cross-sectional view of CC in the middle;

[0068] Figure 8 for Figure 3 Cross-sectional view of DD in the middle;

[0069] Figure 9 for Figure 3 Cross-sectional view of the EE;

[0070] Figure 10 for Figure 3 Cross-sectional view of FF in the middle;

[0071] like Figures 1-10 As shown in the figure, the markings represent:

[0072] a. Pumping system; b. Electromagnetic shaftless pump multi-stage booster device; b1. First stage booster assembly; b2. Second stage booster assembly; b3. Third stage booster assembly; c. High-rise building;

[0073] 1. Pressurization component, 2. Buffer component, 3. Connecting pipe, 4. Conveying pipe, 5. Concrete pumping direction, 6. Rotation direction, 7. Concrete feeder, 8. Grouting hose;

[0074] 11. Rotor assembly, 12. Power assembly, 13. Cylindrical protective cover, 14. Support end cover, 15. Control system, 111. Steel cylinder, 112. Annular slider, 113. Blade, 114. Permanent magnet, 121. Stator core, 122. Stator tooth pole, 123. Wire coil, 131. Outer plate of cylindrical protective cover, 132. Annular protective cover cover plate, 133. Annular groove, 151. Pressure sensor one, 152. Pressure sensor two, 153. Pressure sensor three, 154. Pressure sensor four, 155. Speed ​​sensor one, 156. Speed ​​sensor two, 157. Speed ​​sensor three, 158. Speed ​​sensor four, 159. Processor;

[0075] 21. Annular buffer seat, 22. Annular steel support, 23. Annular steel pad, 24. Annular buffer cavity, 25. Buffer spring, 26. Rubber washer, 211. Inner steel plate of cylindrical buffer, 212. Outer steel plate of cylindrical buffer, 213. Annular buffer base plate, 214. Annular steel clamping plate;

[0076] 31. Connecting cylinder; 32. Thread;

[0077] 71. Storage silo, 72. Concrete, 73. Base. Detailed Implementation

[0078] The features and other related features of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate understanding by those skilled in the art:

[0079] Example: Figure 1-10 As shown, this embodiment relates to a multi-stage pressurized constant-pressure pumping method for ultra-high-rise concrete. The method utilizes pumping system a to pump concrete into high-rise building c. The pumping method mainly includes:

[0080] The concrete feeder 7 is placed on the ground, and the conveying pipe 4 and the grouting hose 8 are connected to the concrete feeder 7 in sequence so that the grouting hose 8 extends to the corresponding position of the high-rise building c.

[0081] like Figure 1-2 As shown, the inlet of the conveying pipe 4 is connected to the concrete feeder 7 on the ground, and the outlet of the conveying pipe 4 extends upward and is connected to the grouting hose 8. The electromagnetic shaftless pump-driven multi-stage booster device b is arranged on the conveying pipe 4, and multiple electromagnetic shaftless pump-driven multi-stage booster devices b are provided. Some of the electromagnetic shaftless pump-driven multi-stage booster devices b are arranged on the vertical section of the conveying pipe 4, and the other part is arranged on the horizontal section of the conveying pipe 4. The grouting hose 8 is connected to the vertical section of the conveying pipe 4, and the concrete feeder 7 is connected to the horizontal section of the conveying pipe 4 through the electromagnetic shaftless pump-driven multi-stage booster device b. Specifically, the concrete feeder 7 includes a storage bin 71 and a base 73. The storage bin 71 is installed on the base 74 and stores concrete 72. The concrete feeder 7 is used to pump the concrete 72, and the concrete 72 is pumped to the corresponding position of the high-rise building c through the conveying pipe 4 and the grouting hose 8 in sequence.

[0082] like Figure 1-2 As shown, the electromagnetic shaftless pump multi-stage booster device b mainly includes a three-stage booster assembly 1, two buffer assemblies 2, and two connecting pipes 3. The booster assembly 1, buffer assemblies 2, and connecting pipes 3 are coaxially arranged. The three-stage booster assembly 1 consists of a first-stage booster assembly a1, a second-stage booster assembly a2, and a third-stage booster assembly a3. The three-stage booster assemblies 1 are connected sequentially. The first-stage booster assembly a1 and the third-stage booster assembly a3 are respectively connected to the two buffer assemblies 2. The two buffer assemblies 2 are respectively connected to the two connecting pipes 3. The connecting pipes 3 are threaded to the conveying pipes 4 (grouting hose 8 and concrete feeder 7). Specifically, the connecting pipes 3 are connecting cylinders 31 with threads 32. One end of the connecting cylinder 31 is fixedly connected to the buffer assembly 2, and the other end is connected to the conveying pipes 4 (grouting hose 8 and concrete feeder 7) through the threads 32 on it.

[0083] like Figure 1-7As shown, the booster assembly 1 includes a rotor assembly 11, a power assembly 12, a cylindrical protective cover 13, a support end cover 14, and a control system 15. The support end cover 14 is located at both ends of the cylindrical protective cover 13. Both the rotor assembly 11 and the power assembly 12 are installed inside the cylindrical protective cover 13, with the power assembly 12 located outside the rotor assembly 11. The power assembly 12 can drive the rotor assembly 11 to rotate. The cylindrical protective cover 13 consists of an outer cylindrical protective cover plate 131 and an annular protective cover cover plate 132. The annular protective cover cover plate 132 is provided with an annular groove 133. The rotor assembly 11 includes a steel cylinder 111, an annular slider 112, blades 113, and a permanent magnet 114. The annular slider 112 is located at both ends of the steel cylinder 111 and cooperates with the annular groove 133. The annular slider 112 can rotate within the annular groove 133. The blades 113 are arranged circumferentially along the inner wall of the steel cylinder 111, and there is a set of them. The blades 113 are fan-shaped and inclined. The blades 113 are located in the middle of the inner wall of the steel cylinder 111. The pumping direction 5 of the concrete is from bottom to top. The blades 113 can withstand the impact of the pumped concrete and guide the pumped concrete. The permanent magnet 114 is arranged circumferentially along the outer wall of the steel cylinder 111.

[0084] The power assembly 12 includes a stator core 121, stator teeth 122, and wire coils 123. The stator core 121 is arranged circumferentially along the cylindrical protective cover 13. The wire coils 123 are installed inside the stator core 121. The stator teeth 122 are arc-shaped and connected to the stator core 121. By energizing the wire coils 123, the power assembly 12 can generate a rotating magnetic field. The rotating magnetic field generated by the power assembly 12 drives the permanent magnet 114 of the rotor assembly 11 to rotate, thereby driving the steel cylinder 111 to rotate. That is, the annular slider 112 rotates within the annular groove 133, thus realizing the rotation of the blades 113 (see rotation direction 6 of the booster device). Figure 2 (As shown).

[0085] like Figure 2 , 4As shown in Figure 7, the control system 15 includes a pressure sensor, a speed sensor, and a processor 155. The pressure sensor and speed sensor are electrically connected to the processor 155. The pressure sensor and speed sensor measure the pressure and speed of the concrete, respectively, and transmit the data to the processor 155 for analysis and processing. The pressure sensor and speed sensor are both arranged circumferentially along the inner wall of the steel cylinder 111, and they are staggered, that is, each speed sensor is located between two adjacent pressure sensors, and each pressure sensor is located between two adjacent speed sensors. In this embodiment, the pressure sensors include pressure sensor 151, pressure sensor 152, pressure sensor 153, and pressure sensor 154, and the speed sensors include speed sensor 155, speed sensor 156, speed sensor 157, and speed sensor 158. Pressure sensor 151 and speed sensor 155 are both located on the side of the lower end support cap 14 of the first-stage pressurization assembly a1. Pressure sensor 152 and speed sensor 156 are both located on the side of the support cap 14 between the first-stage pressurization assembly a1 and the second-stage pressurization assembly a2. Pressure sensor 153 and speed sensor 157 are both located on the side of the support cap 14 between the second-stage pressurization assembly a2 and the third-stage pressurization assembly a3. Pressure sensor 154 and speed sensor 158 are both located on the side of the upper end support cap 14 of the third-stage pressurization assembly a3, which can improve the accuracy of the measurement results.

[0086] like Figure 2As shown in Figures 8-10, the buffer assembly 2 includes an annular buffer seat 21, an annular steel support 22, an annular steel pad 23, an annular buffer cavity 24, buffer springs 25, and rubber washers 26. The annular buffer cavity 24 is located inside the annular buffer seat 21. Multiple buffer springs 25 are arranged along the circumferential direction of the annular buffer cavity 24 to provide a buffering effect. In this embodiment, the annular buffer seat 21 is composed of a cylindrical inner buffer steel plate 211, a cylindrical outer buffer steel plate 212, an annular buffer base plate 213, and an annular steel clamping plate 214. The annular steel clamping plate 214 has an annular groove that communicates with the annular buffer cavity 24. The size of the annular groove is similar to that of the annular buffer cavity 24. The size of the annular steel support 22 is adapted to the size of the annular groove, which guides the annular steel support 22. One end of the annular steel support 22 is connected to the support end cap 14, and the other end extends through the annular groove into the annular buffer cavity 24 and is connected to the annular steel pad 23. The annular steel pad 23 contacts or connects with the buffer spring 25 in the corresponding annular buffer cavity 24. The size of the annular buffer cavity 24 is adapted to the size of the annular steel pad 23, and the annular buffer cavity 24 guides the annular steel pad 23. The annular steel pad 23 has a ring width greater than the annular groove width, which can prevent the annular steel support 22 from moving outside the annular buffer cavity 22 of the buffer assembly 2. A rubber gasket 26 is provided between the support end cap 14 and the annular buffer seat 21, and the rubber gasket 26 is sleeved on the outside of the annular steel support 22. This not only prevents the support end cap 14 and the annular buffer seat 21 from colliding, but also guides the annular steel support 22.

[0087] The power components, pressure sensors, and speed sensors of each stage of the electromagnetic shaftless pump multi-stage booster device are activated. The power components drive the corresponding booster components to rotate. The monitoring data from the pressure and speed sensors are used to adjust the rotation speed of each stage of the electromagnetic shaftless pump multi-stage booster device and determine the length of the delivery pipe between the electromagnetic shaftless pump multi-stage booster devices so that concrete can be pumped to the corresponding location of the high-rise building by a concrete mixer. In this embodiment, the boost value is determined using monitoring data and then evenly distributed to each boosting component. That is, the required boost value is determined by monitoring the pressure, and then evenly distributed to each boosting component to determine the rotational speed of each boosting component. Therefore, it is necessary to calculate the rotational speed of each boosting component on the electromagnetic shaftless pump-driven multi-stage boosting device. It is also necessary to calculate and determine the length of the conveying pipe between the electromagnetic shaftless pump-driven multi-stage boosting devices when maintaining a constant pressure in the conveying pipe. Here, the length of the conveying pipe between the electromagnetic shaftless pump-driven multi-stage boosting devices refers to the length of the conveying pipe between two adjacent electromagnetic shaftless pump-driven multi-stage boosting devices on the vertical section of the conveying pipe.

[0088] Specifically, the calculation method for the rotational speed of each stage booster component in a multi-stage booster device driven by an electromagnetic shaftless pump includes:

[0089] Take a representative section of the pumping pipeline, including a multi-stage booster device for electromagnetic shaftless pumps and a delivery pipe connected to one end of the multi-stage booster device. Assume the delivery pipe has m multi-stage booster devices for electromagnetic shaftless pumps, each with a length ΔL, consisting of j0 booster stages, where j = 1, 2, 3, ..., j...j0. Then the length of each booster stage is δ = ΔL / j0. The inner diameter of each booster stage and the delivery pipe is d (in meters), and the self-weight of the pumped concrete is γ (in N / m³). 3 Where g is the acceleration due to gravity, g = 9.8 m / s² 2 ;

[0090] The electromagnetic shaftless pump pushes a multi-stage booster device to pump concrete vertically upwards. The pressure loss Δp experienced by the concrete during pumping is determined by Δp Vc and Δp γ It consists of two parts, where Δp Vc It is the friction loss experienced by concrete as it flows within the pump pipe, including the resistance generated by the viscosity of the concrete and the frictional resistance generated by the flow of the concrete; Δp γ It is the pressure generated by the weight of concrete during vertical pumping, that is, the total pressure loss Δp of concrete pumped vertically upward in each stage of the booster assembly. FI for:

[0091] Δp FI =Δp Vc +Δp γ Formula 1;

[0092] If the pumped concrete is ordinary concrete, the pressure loss along the flow rate Δp per meter during vertical upward pumping is... Vcm for:

[0093]

[0094] In the formula: Δp Vcm d is the pressure loss per meter of concrete flowing in the vertical delivery pipe, measured in Pa / m; d is the diameter of the concrete delivery pipe, measured in meters; K1 is the viscosity coefficient, measured in Pa; K2 is the velocity coefficient, measured in Pa·s / m; S1 is the concrete slump, measured in mm; t2 / t1 is the ratio of the switching time of the concrete pump distribution valve to the time of the piston pushing the concrete, which can be taken as 0.30 when the equipment performance is unknown; v m α is the average flow velocity of the concrete mixture in the conveying pipe, in m / s; α is the ratio of radial pressure to axial pressure, which is 0.90 for ordinary concrete; β is a conversion factor, which is 3, 4, and 5 when d / 2 is 100, 125, and 150 mm respectively.

[0095] The pressure Δp generated per meter of concrete by its weight during vertical pumping γm(Unit: Pa / m) is:

[0096] Δp γm =γ Equation 3;

[0097] Substituting Equations 2 and 3 into Equation 1, we can obtain the total pressure loss Δp of the concrete pumped vertically upward in each stage of the pressurization assembly. FI for:

[0098]

[0099] The pressure p generated by the j-th stage pressurization component on the pumped concrete w (Unit: Pa / m) is:

[0100] p w =γv 2 / 2g=γ[v1 / (πnR / 30v0)] 2 / 2g Formula 5;

[0101] In the formula: v is the flow velocity provided to the concrete by the j-th stage pressurization component, in m / s, v=v1 / (ωR / v0)=v1 / (πnR / 30v0); ω is the angular velocity of each stage pressurization component, in rad / s; n is the rotational speed, in r / min; R is the blade radius, in m; v0 is the blade tip velocity, in m / s; v1 is the blade root velocity, in m / s;

[0102] Assuming the electromagnetic shaftless pump pushes a multi-stage booster device, the required output concrete pressure is p. eh The axial pressure of the concrete entering the multi-stage booster device of the electromagnetic shaftless pump is p. s If the electromagnetic shaftless pump pushes a multi-stage booster device, and each stage of the booster distributes the boost value evenly, then the pressure p that each stage of the booster needs to provide is... w for:

[0103]

[0104] Equation 5 equals Equation 6, so we get the required output pressure p for recovery. eh At that time, the rotational speed n of each stage of the booster assembly is:

[0105]

[0106] The radial pressure p of the concrete at the inlet of the booster assembly is monitored by a pressure sensor. d For ordinary concrete, the radial pressure p of the concrete in the conveying pipeline d With axial pressure p s If the ratio α = 0.90, then the axial pressure p of the concrete entering the multi-stage booster device of the electromagnetic shaftless pump is... s =p d / α;

[0107] The axial pressure p of the concrete at the inlet of each stage of the booster unit is monitored by a pressure sensor inside the multi-stage booster unit propelled by an electromagnetic shaftless pump. s1 p s2 p s3 …p sj0 and the axial pressure p of the concrete at the outlet of the last stage booster assembly se ;

[0108] The concrete flow velocity v at the inlet of each stage of the booster unit is monitored by a velocity sensor inside the electromagnetic shaftless pump-driven multi-stage booster device. m1 v m2 v m3 …v mj0 and the concrete flow velocity v at the outlet of the last stage pressurization component e v e ==v mL ;

[0109] If the radius from the center of rotation to the blade tip is r0 (in meters), and the radius from the center of rotation to the blade root is r1 = d / 2 (in meters), then the blade tip rotation speed is v0 = πnr0 / 30, and the blade root rotation speed is v1 = πnr1 / 30. Substituting v0 and v1 into Equation 7, we can obtain the rotation speed n of the j-th stage booster assembly required to restore the required output pressure. j for:

[0110]

[0111] If the pumped concrete is high-strength concrete, the pressure loss along the flow rate Δp per meter during vertical upward pumping is... Vum for:

[0112] Δp Vcm =Δp Vum =0.015 + 0.057η (Equation 9);

[0113] In the formula: Δp Vum This refers to the pressure loss per meter of a high-strength concrete vertical conveying pipe, expressed in units of 10. 6 N / m 2 η is the plastic viscosity;

[0114] Combining equations 3, 4, 5, 6, and 9, for high-strength concrete, to restore the required output pressure, the rotational speed n of the j-th stage booster component... j for:

[0115]

[0116] The calculation method for the delivery pipe length between multiple stages of a multi-stage booster pump powered by an electromagnetic shaftless pump includes:

[0117] When the concrete is pumped to the next electromagnetic shaftless pump pushing the multi-stage booster device, the concrete pressure loss is:

[0118]

[0119] In the formula: v mL The flow rate of the pressurized concrete delivered from the electromagnetic shaftless pump to the multi-stage pressurization device can be monitored by a velocity sensor or calculated using Equation 5, v. mL =v;

[0120] The required pressure during pouring is p. eh At that time, the pressure ps at the inlet of the multi-stage booster device driven by an electromagnetic shaftless pump is set. L The required pressure p during pouring eh The ratio is the constant pressure delivery ratio k = ps L / p eh Assume constant pressure delivery ratio When the pressure changes significantly within the delivery pipe, it indicates that the constant pressure delivery requirement cannot be met. Assuming a constant pressure delivery ratio k = 0.80, the concrete pressure loss Δp within the delivery pipe length between the multi-stage booster devices of the electromagnetic shaftless pump is calculated. L ≤(1-k)p eh ,Right now:

[0121]

[0122] The length L of the delivery pipe between the electromagnetic shaftless pump and the multi-stage booster unit is:

[0123]

[0124] The beneficial technical effects of this embodiment are as follows:

[0125] (1) Reduce the initial pumping pressure of high-rise buildings to ensure construction safety, while reducing the pressure requirements of pumping equipment and the strength requirements of delivery pipes to reduce equipment cost investment;

[0126] (2) The electromagnetic shaftless pump pusher multi-stage booster device can increase the pumping height of the pumped concrete.

[0127] (3) The electromagnetic shaftless pump pusher has a large internal space in the pipeline, which is beneficial for pumping concrete.

[0128] (4) The series-connected multi-stage booster assembly can achieve multiple boosting operations;

[0129] (5) The length of the delivery pipe between the electromagnetic shaftless pump and the multi-stage booster device can be calculated and determined when the delivery pipe is kept under constant pressure.

[0130] (6) Monitor the concrete pump inlet pressure at all times and adjust the speed of the electromagnetic shaftless pump multi-stage booster device in real time to save energy and reduce emissions.

[0131] (7) Monitor the outlet pressure of the electromagnetic shaftless pump-driven multi-stage booster device at all times, and adjust the blade speed in a cyclical manner to ensure that the pressure meets the requirements and is stable.

[0132] (8) Adding an electromagnetic shaftless pump to the hose can ensure that the pouring pressure meets the requirements and make the poured concrete more compact.

[0133] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A method for pumping concrete at an ultra-high level with a multi-stage pressure-boosting constant-pressure pumping, characterized in that The pumping method includes: A concrete feeder is placed on the ground, and a delivery pipe and a grouting hose are connected to the concrete feeder in sequence so that the grouting hose extends to the corresponding location of the high-rise building. The conveying pipe is equipped with an electromagnetic shaftless pump-driven multi-stage booster device, which includes a multi-stage booster assembly. The booster assembly includes a rotor assembly and a power assembly. The rotor assembly includes a steel cylinder, an annular slider, blades, and a permanent magnet. The annular slider is located at both ends of the steel cylinder. The blades are arranged circumferentially along the inner wall of the steel cylinder. The permanent magnet is arranged circumferentially along the outer wall of the steel cylinder. The rotating magnetic field generated by the power assembly drives the permanent magnet of the rotor assembly to rotate. The booster assembly is equipped with a pressure sensor and a speed sensor. The power component, pressure sensor, and speed sensor of each stage of the electromagnetic shaftless pump-driven multi-stage booster device are activated. The power component drives the corresponding booster component to rotate. The rotational speed of each stage of the booster component is adjusted using the monitoring data from the pressure sensor and the speed sensor. The length of the delivery pipe between the electromagnetic shaftless pump-driven multi-stage booster devices is determined so that concrete can be pumped to the corresponding location of the high-rise building by the concrete mixer. The boosting value is determined by the monitoring data and is evenly distributed to each stage of the booster component to determine the rotational speed of each stage of the booster component. Calculations are required for the rotational speed of each stage of the booster component and the length of the delivery pipe between the electromagnetic shaftless pump-driven multi-stage booster devices. The method for calculating the rotational speed of each stage of the booster assembly in the multi-stage booster device propelled by the electromagnetic shaftless pump includes: The conveying pipe is set up with a total of m A multi-stage booster unit is propelled by an electromagnetic shaftless pump. The length of the multi-stage booster unit is Δ. L ,Depend on j The 0-stage booster assembly consists of... j =1, 2, 3, ... j If 0, then the length of each booster assembly is δ = Δ L / j 0; the inner diameter of the concrete delivery pipe is d The unit weight of the pumped concrete is γ , g It is the acceleration due to gravity; The electromagnetic shaftless pump uses a multi-stage booster unit to pump concrete vertically upwards. The total pressure loss Δ during the vertical upward pumping of concrete in each booster unit is... p FI From Δ p Vc and Δ p γ It consists of two parts, where Δ p Vc This refers to the frictional losses experienced by concrete as it flows through the pump pipe, including the resistance generated by the viscosity of the concrete and the frictional resistance generated by the flow of the concrete; Δ p γ It is the pressure generated by the weight of concrete during vertical pumping, and the total pressure loss Δ of concrete pumped vertically upward in each stage of the booster assembly. p FI for: D p FI = D p Vc +D p γ formula 1; If the pumped concrete is ordinary concrete, the pressure loss along the line per meter of vertical upward pumping is Δ. p Vcm for: Formula 2; In the formula: Δ p Vcm It is the pressure loss per meter generated when concrete flows in a vertical delivery pipe; d It is the inner diameter of the concrete delivery pipe; K 1 is the coefficient of adhesion; K 2 is the velocity coefficient; S 1 represents the concrete slump; t 2 / t 1 is the ratio of the switching time of the concrete pump distribution valve to the time of the piston pushing concrete. When the equipment performance is unknown, take 0.

30. v m It is the average flow velocity of the concrete mixture within the delivery pipe; α It is the ratio of radial pressure to axial pressure, which is taken as 0.90 for ordinary concrete; β These are conversion factors. d When / 2 is 100, 125, and 150 mm respectively, β Choose 3, 4, or 5; When concrete is pumped vertically, the pressure Δ generated by the self-weight of the concrete per unit vertical height is... p γm for: Δ p γm = γ Formula 3; Substituting Equations 2 and 3 into Equation 1, we can obtain the total pressure loss Δ of the concrete pumped vertically upward in each stage of the pressurization assembly. p FI for: Equation 4; No. j The pressure generated by the booster unit on the pumped concrete p w for: Formula 5; In the formula: v It is the first j The flow rate provided by the booster unit to the concrete. ; ω It is the angular velocity of each stage of the booster assembly; n It is the rotational speed; R It is the blade radius; v 0 is the tip velocity of the blade; v 1 represents the velocity at the leaf root; Assuming the electromagnetic shaftless pump pushes a multi-stage booster device, the required output concrete pressure is... p eh The axial pressure of the concrete entering the multi-stage booster device of the electromagnetic shaftless pump is... p s If the electromagnetic shaftless pump pushes a multi-stage booster device, and each stage of the booster distributes the booster pressure evenly, then the pressure required by each stage of the booster will be... p w for: Formula 6; By making Equation 5 equal to Equation 6, we can obtain the required output concrete pressure for restoration. p eh At that time, the rotational speed of each stage of the booster assembly n for: Formula 7; The radial pressure of the concrete at the inlet of the booster assembly is monitored using a pressure sensor. p d For ordinary concrete, the radial pressure of concrete in the conveying pipeline p d With axial pressure p s ratio α = 0.90, then the axial pressure of the concrete entering the multi-stage booster device of the electromagnetic shaftless pump is 0.

90. p s = p d / α ; The axial pressure of the concrete at the inlet of each stage of the booster unit is monitored by pressure sensors inside the multi-stage booster device propelled by an electromagnetic shaftless pump. p s1 , p s2 , p s3 … p sj0 and the concrete axial pressure at the outlet of the final stage booster assembly p se ; The concrete flow velocity at the inlet of each stage of the booster unit is monitored by a velocity sensor inside the electromagnetic shaftless pump-driven multi-stage booster device. v m1 , v m2 , v m3 … v mj0 and the concrete flow rate at the outlet of the final stage pressurization component v e , v e = v mL , v mL The flow rate of the pressurized concrete delivered from the electromagnetic shaftless pump to the multi-stage pressurization device can be monitored by a velocity sensor or calculated using Equation 5. v mL = v ; If the radius from the center of rotation to the blade tip is r 0, the radius from the center of rotation to the leaf root is r 1 = d / 2, then the tip velocity is v 0=π nr 0 / 30, the velocity at the leaf root is v 1 = π nr 1 / 30, will v 0 and v Substituting 1 into Equation 7, we can obtain the required output pressure for recovery. j Speed ​​of the supercharger assembly n j for: Formula 8; If the pumped concrete is high-strength concrete, the pressure loss along the flow rate Δ per meter during vertical upward pumping is... p Vum for: D p Vcm =D p Vum =0.015+0.057 η formula 9; In the formula: Δ p Vum This refers to the pressure loss per meter of a high-strength concrete vertical conveying pipe. η It is a plastic viscosity; Combining equations 3, 4, 5, 6, and 9, for high-strength concrete, in order to restore the required output pressure, the first... j Speed ​​of the supercharger assembly n j for: Formula 10.

2. The method for multi-stage pressurization and constant pressure pumping of ultra-high-rise concrete as described in claim 1, characterized in that... The method for calculating the length of the delivery pipe between the electromagnetic shaftless pump and the multi-stage booster device includes: When the concrete is pumped to the next electromagnetic shaftless pump pushing the multi-stage booster device, the concrete pressure loss is: Formula 11; In the formula: v mL The flow rate of the pressurized concrete delivered from the electromagnetic shaftless pump to the multi-stage pressurization device can be monitored by a velocity sensor or calculated using Equation 5. v mL = v ; The required pressure during pouring is p eh At that time, the pressure at the inlet of the electromagnetic shaftless pump pushing the multi-stage booster device is set. ps L Pressure required during pouring p eh The ratio is the constant pressure delivery ratio. k = ps L / p eh Assume constant pressure delivery ratio k ≤ This indicates that the pressure inside the delivery pipe fluctuates significantly and fails to meet the requirements for constant pressure delivery. The minimum constant pressure conveying ratio required for constant pressure conveying is determined based on project requirements; let the constant pressure conveying ratio be... k =0.80, the concrete pressure loss Δ within the length of the delivery pipe between the multi-stage booster devices of the electromagnetic shaftless pump. p L ≤(1- k ) p eh ,Right now: Equation 12; The length of the delivery pipe between the electromagnetic shaftless pump and the multi-stage booster unit L for: Formula 13.

3. The method for multi-stage pressurization and constant pressure pumping of ultra-high-rise concrete as described in claim 1, characterized in that... The booster assembly also includes a cylindrical protective cover and a support end cover. The rotor assembly and the power assembly are both installed inside the cylindrical protective cover. The support end cover is located at both ends of the cylindrical protective cover. The cylindrical protective cover is provided with an annular groove that cooperates with the annular slider.

4. The method for multi-stage pressurization and constant pressure pumping of ultra-high-rise concrete as described in claim 3, characterized in that... The power assembly includes a stator core, stator teeth, and coils. The stator core is arranged circumferentially along the cylindrical protective cover, the coils are installed inside the stator core, and the stator teeth are connected to the stator core.

5. The method for multi-stage pressurization and constant pressure pumping of ultra-high-rise concrete as described in claim 1, characterized in that... The electromagnetic shaftless pump-driven multi-stage booster device also includes a buffer assembly and a connecting pipe, and the first-stage booster assembly and the last-stage booster assembly are both connected to the buffer assembly.

6. The method for multi-stage pressurization and constant pressure pumping of ultra-high-rise concrete as described in claim 5, characterized in that... The buffer assembly includes an annular buffer seat, an annular buffer cavity disposed within the annular buffer seat, a plurality of buffer springs arranged along the circumferential direction of the annular buffer cavity, and an annular steel support connected at one end to the pressurization assembly. The other end of the annular steel support extends into the annular buffer cavity and is connected to an annular steel pad. The annular steel pad contacts or connects to the buffer springs corresponding to those in the annular buffer cavity.

7. The method for multi-stage pressurization and constant pressure pumping of ultra-high-rise concrete as described in claim 6, characterized in that... The annular buffer seat is composed of an inner cylindrical buffer steel plate, an outer cylindrical buffer steel plate, an annular buffer base plate, and an annular steel clamping plate. The annular steel clamping plate has an annular groove that communicates with the annular buffer cavity. The width of the annular groove is smaller than the width of the annular buffer cavity, and the width of the annular steel pad is larger than the width of the annular groove.

8. The method for multi-stage pressurization and constant pressure pumping of ultra-high-rise concrete as described in claim 3, characterized in that... The pressure sensor is arranged circumferentially along the inner side of the support end cover, and each speed sensor is located between two adjacent pressure sensors.

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