A constant pressure pumping method for pumping concrete in super high-rise buildings

Abstract

The application discloses a kind of super high layer pumping concrete constant pressure pumping method, comprising: concrete material machine is arranged on ground, conveying pipe and grouting hose are sequentially connected on concrete material machine, to make grouting hose extend to the corresponding position of high-rise building;Start power assembly, pressure sensor and speed sensor on electromagnetic shaftless pump boosting device, drive electromagnetic shaftless pump boosting device to rotate by power assembly, use the monitoring data of pressure sensor and speed sensor to adjust the rotating speed of electromagnetic shaftless pump boosting device, and determine the length of conveying pipe between electromagnetic shaftless pump boosting device, to pump concrete to the corresponding position of high-rise building by concrete material machine;Wherein, the length of conveying pipe between electromagnetic shaftless pump boosting device needs to be calculated.The application has the advantages that: the length of conveying pipe between electromagnetic shaftless pump boosting device can be calculated and determined when keeping constant pressure state of conveying 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 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) It is difficult to ensure stable pouring pressure in the pumping method of ultra-high-rise pouring, which affects the quality of pouring; (5) 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 constant-pressure pumping method for ultra-high-rise concrete. This method determines the location of the electromagnetic shaftless pump booster device on the high-rise building pumping pipeline by ensuring that the ratio of the inlet and outlet pressures of the device reaches a certain value. The device has blades on its inner wall, and pressure sensors monitor pressure changes to 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. This ensures that the concrete pumping pressure remains constant in the pipeline, guaranteeing the construction quality of the pouring. Simultaneously, the electromagnetic shaftless pump booster device is connected to the pipeline through a buffer assembly to buffer the concrete pressure and the impact load of the pressurization, ensuring the safety and stability of the pipeline.

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

[0006] A method for 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 booster device, which includes a booster assembly. The booster assembly includes a rotor assembly, a power assembly, 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 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 cylindrical protective cover is provided with an annular groove that cooperates with the annular slider. The rotating magnetic field generated by the power assembly drives the permanent magnet of the rotor assembly to rotate. A pressure sensor and a speed sensor are provided on the inner side of the support end cover.

[0009] The power component, pressure sensor, and speed sensor on the electromagnetic shaftless pump booster are activated. The power component drives the electromagnetic shaftless pump booster to rotate. The rotational speed of the electromagnetic shaftless pump booster 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 booster devices is determined so that concrete can be pumped to the corresponding location on the high-rise building by the concrete mixer. Calculations are required for the rotational speed of the electromagnetic shaftless pump booster and the length of the delivery pipe between the electromagnetic shaftless pump booster devices.

[0010] The calculation method for the rotational speed of the electromagnetic shaftless pump booster includes:

[0011] Assume that there are m electromagnetic shaftless pump booster devices in the conveying pipe, the length of the electromagnetic shaftless pump booster device is ΔL, the length of the conveying pipe between the electromagnetic shaftless pump booster devices is L, the inner diameter of the electromagnetic shaftless pump booster device 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 booster device pumps concrete vertically upwards. The pressure loss Δp experienced by the concrete during pumping is mainly due to 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 upwards in the electromagnetic shaftless pump booster device. 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 mα 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 during the vertical upward pumping of concrete in the electromagnetic shaftless pump booster device. FI for:

[0020]

[0021] The electromagnetic shaftless pump booster device generates pressure p 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 electromagnetic shaftless pump booster device, v=v1 / (ωR / v0)=v1 / (πnR / 30v0); ω is the angular velocity of the electromagnetic shaftless pump booster device; n is the rotational speed; R is the blade radius; v0 is the blade tip velocity; v1 is the blade root velocity;

[0024] Assume the electromagnetic shaftless pump booster device requires an output concrete pressure of p. eh The axial pressure of the concrete entering the electromagnetic shaftless pump booster device is p. s If the electromagnetic shaftless pump booster device outputs concrete pressure p eh The electromagnetic shaftless pump booster device needs to provide a pressure p. 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 the electromagnetic shaftless pump booster is:

[0027]

[0028] 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. Therefore, the blade tip rotational speed is v0 = πnr0 / 30, and the blade root rotational speed is v1 = πnr1 / 30. Substituting v0 and v1 into Equation 7, we can obtain the rotational speed n of the electromagnetic shaftless pump booster device for restoring the required output pressure as follows:

[0029]

[0030] 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:

[0031] Δp Vcm =Δp Vum =0.015 + 0.057η (Equation 9);

[0032] 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.

[0033] Combining equations 3, 4, 5, 6, and 9, for high-strength concrete, the rotational speed n of the electromagnetic shaftless pump booster device to restore the required output pressure is:

[0034]

[0035] The method for calculating the length of the delivery pipe between the electromagnetic shaftless pump booster devices includes:

[0036] When the concrete is pumped to the next electromagnetic shaftless pump booster, the concrete pressure loss is:

[0037]

[0038] In the formula: v mL The flow rate of the pressurized concrete delivered from the electromagnetic shaftless pump pressurization device can be monitored by a velocity sensor or calculated using Equation 5, v. mL =v;

[0039] The required pressure during pouring is p. eh At that time, the pressure ps at the inlet of the electromagnetic shaftless pump booster device 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 length of the delivery pipe between the electromagnetic shaftless pump booster and the delivery device is calculated. L ≤(1-k)peh ,Right now:

[0040]

[0041] The length L of the delivery pipe between the electromagnetic shaftless pump booster device and the delivery pipe is:

[0042]

[0043] 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.

[0044] The electromagnetic shaftless pump booster device further includes a buffer assembly and a connecting pipe. Both ends of the booster assembly are connected to the connecting pipe through the buffer assembly. The buffer assembly includes an annular buffer seat, an annular buffer cavity disposed in 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 to the booster assembly at one end. 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 the annular buffer cavity.

[0045] A rubber gasket is provided between the support end cap and the annular buffer seat, and the rubber gasket is fitted around the annular steel support.

[0046] 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.

[0047] The concrete feeder includes a storage bin and a base, with the storage bin installed on the base.

[0048] The advantages of this invention are:

[0049] (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;

[0050] (2) It can increase the pumping height of pumped concrete;

[0051] (3) The electromagnetic shaftless pump booster has a large internal space in the pipeline, which is beneficial for pumping concrete.

[0052] (4) The length of the delivery pipe between the electromagnetic shaftless pump booster device can be calculated and determined when the delivery pipe is kept under constant pressure.

[0053] (5) Monitor the concrete pump inlet pressure at all times and adjust the speed of the electromagnetic shaftless pump booster in real time to save energy and reduce emissions.

[0054] (6) Adding an electromagnetic shaftless pump booster device to the hose can ensure that the pouring pressure meets the requirements and make the poured concrete more compact. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of the present invention;

[0056] Figure 2 This is a schematic diagram of the electromagnetic shaftless pump booster device of the present invention;

[0057] Figure 3 This is a schematic cross-sectional view of the electromagnetic shaftless pump booster device of the present invention.

[0058] Figure 4 This is a circuit diagram of the control system of the present invention;

[0059] Figure 5 for Figure 3 Cross-sectional view of AA in the middle;

[0060] Figure 6 for Figure 3 Cross-sectional view of BB in the middle;

[0061] Figure 7 for Figure 3 Cross-sectional view of CC in the middle;

[0062] Figure 8 for Figure 3 Cross-sectional view of DD in the middle;

[0063] Figure 9 for Figure 3 Cross-sectional view of the EE;

[0064] Figure 10 for Figure 3 Cross-sectional view of FF in the middle;

[0065] like Figures 1-10 As shown in the figure, the labels represent:

[0066] a. Pumping system; b. Electromagnetic shaftless pump booster device; c. High-rise building;

[0067] 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;

[0068] 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. Speed ​​sensor one, 154. Speed ​​sensor two, 155. Processor;

[0069] 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;

[0070] 31. Connecting cylinder; 32. Thread;

[0071] 71. Storage silo, 72. Concrete, 73. Base. Detailed Implementation

[0072] 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:

[0073] Example: Figure 1-10 As shown, this embodiment relates to a constant-pressure pumping method for super high-rise concrete, which uses pumping system a to pump concrete to a high-rise building c. The pumping method mainly includes:

[0074] 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.

[0075] 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 booster device b is arranged on the conveying pipe 4, and multiple electromagnetic shaftless pump booster devices b are provided. Some of the electromagnetic shaftless pump 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 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 77 pumps 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.

[0076] like Figure 1-2 As shown, the electromagnetic shaftless pump booster device b mainly includes a booster component 1, a buffer component 2, and a connecting pipe 3. The booster component 1, the buffer component 2, and the connecting pipe 3 are coaxially arranged. There are two buffer components 2, which are respectively installed at both ends of the booster component 1. Correspondingly, there are also two connecting pipes 3, which are respectively connected to the two buffer components 2. The connecting pipe 3 is threaded to the conveying pipe 4 (grouting hose 8, concrete feeder 7). Specifically, the connecting pipe 3 is a connecting cylinder 31 with a thread 32. One end of the connecting cylinder 31 is fixedly connected to the buffer component 2, and the other end is connected to the conveying pipe 4 (grouting hose 8, concrete feeder 7) through the thread 32 on it.

[0077] like Figure 1-7 As 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.

[0078] 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).

[0079] like Figure 2 ,4 As 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. Both the pressure sensor and speed sensor are arranged circumferentially along the inner side of the support end cover 14, 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. Specifically, the pressure sensor includes pressure sensor one 151 and pressure sensor two 152, and the speed sensor includes speed sensor one 153 and speed sensor two 154. Pressure sensor one 151 and speed sensor one 153 are both installed on the side of the lower support end cover 14 of the pressurization assembly 1, while pressure sensor two 152 and speed sensor two 154 are both installed on the side of the upper support end cover 14 of the pressurization assembly 1, which improves the accuracy of the measurement results.

[0080] like Figure 2 As 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.

[0081] The power component, pressure sensor, and speed sensor on the electromagnetic shaftless pump booster are activated. The power component drives the electromagnetic shaftless pump booster to rotate. The rotational speed of the electromagnetic shaftless pump booster is adjusted using the monitoring data from the pressure and speed sensors. The length of the delivery pipe between the electromagnetic shaftless pump booster units is also determined so that concrete can be pumped to the corresponding location on the high-rise building by a concrete mixer. In this embodiment, the booster value is determined using monitoring data; that is, the required booster value is determined by the monitored pressure, which in turn determines the rotational speed of the booster component. Therefore, the rotational speed of the electromagnetic shaftless pump booster needs to be calculated. The length of the delivery pipe between the electromagnetic shaftless pump booster units needs to be calculated to maintain a constant pressure in the delivery pipe. Here, the length of the delivery pipe between the electromagnetic shaftless pump booster units refers to the length of the delivery pipe between two adjacent electromagnetic shaftless pump booster units in the vertical section of the delivery pipe.

[0082] Specifically, the calculation method for the rotational speed of the electromagnetic shaftless pump booster includes:

[0083] Take a representative section of the pumping pipeline, including an electromagnetic shaftless pump booster device and a delivery pipe connected to one end of the electromagnetic shaftless pump booster device. Assume there are m electromagnetic shaftless pump booster devices in the delivery pipe, the length of each device is ΔL, the length of the delivery pipe between the devices is L, the inner diameter of both the devices and the delivery pipe is d (in meters), and the self-weight of the pumped concrete is γ (in N / m³). 3 (g is the acceleration due to gravity, g = 9.8 m / s²) 2 ;

[0084] The electromagnetic shaftless pump booster device pumps concrete vertically upwards. The pressure loss Δp experienced by the concrete during pumping is mainly due to 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 upwards in the electromagnetic shaftless pump booster device. FI for:

[0085] Δp FI =Δp Vc +Δp γ Formula 1;

[0086] If the pumped concrete is ordinary concrete, the pressure loss along the flow rate Δp per meter during vertical upward pumping is... Vcm for:

[0087]

[0088] In the formula: Δp Vcm d is the pressure loss per meter of concrete flowing in the vertical delivery pipe (in Pa / m); d is the diameter of the concrete delivery pipe (in m); K1 is the viscosity coefficient (in Pa); K2 is the velocity coefficient (in Pa·s / m); S1 is the concrete slump (in mm); t2 / t1 is the ratio of the switching time of the concrete pump distribution valve to 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 the conversion factor, which is 3, 4, and 5 when d / 2 is 100, 125, and 150 mm, respectively.

[0089] The pressure Δp generated per meter of concrete by its weight during vertical pumping γm (Unit: Pa / m) is:

[0090] Δp γm =γ Equation 3;

[0091] Substituting equations 2 and 3 into equation 1, we can obtain the total pressure loss Δp during the vertical upward pumping of concrete in the electromagnetic shaftless pump booster device. FI for:

[0092]

[0093] The electromagnetic shaftless pump booster device generates pressure p on the pumped concrete. w (Unit: Pa / m) is:

[0094] p w =γv 2 / 2g=γ[v1 / (πnR / 30v0)] 2 / 2g Formula 5;

[0095] In the formula: v is the flow velocity (in m / s) provided to the concrete by the electromagnetic shaftless pump booster device, v=v1 / (ωR / v0)=v1 / (πnR / 30v0); ω is the angular velocity (in rad / s) of the electromagnetic shaftless pump booster device; 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);

[0096] Assume the electromagnetic shaftless pump booster device requires an output concrete pressure of p. eh The axial pressure of the concrete entering the electromagnetic shaftless pump booster device is p. sIf the electromagnetic shaftless pump booster device outputs concrete pressure p eh The electromagnetic shaftless pump booster device needs to provide a pressure p. w for:

[0097]

[0098] Equation 5 equals Equation 6, so we get the required output pressure p for recovery. eh At that time, the rotational speed n of the electromagnetic shaftless pump booster is:

[0099]

[0100] 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). Therefore, the blade tip rotational speed is v0 = πnr0 / 30, and the blade root rotational speed is v1 = πnr1 / 30. Substituting v0 and v1 into Equation 7, we can obtain the rotational speed n of the electromagnetic shaftless pump booster device for restoring the required output pressure as follows:

[0101]

[0102] 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:

[0103] Δp Vcm =Δp Vum =0.015 + 0.057η (Equation 9);

[0104] In the formula: Δp Vum The pressure loss per meter of high-strength concrete vertical conveying pipe (unit: 10). 6 N / m 2 ); η is the plastic viscosity;

[0105] Combining equations 3, 4, 5, 6, and 9, for high-strength concrete, the rotational speed n of the electromagnetic shaftless pump booster device to restore the required output pressure is:

[0106]

[0107] The calculation method for the length of the delivery pipe between the electromagnetic shaftless pump booster device includes:

[0108] When the concrete is pumped to the next electromagnetic shaftless pump booster, the concrete pressure loss is:

[0109]

[0110] In the formula: v mLThe flow velocity (in m / s) of the pressurized concrete delivered from the electromagnetic shaftless pump pressurization device can be monitored by a velocity sensor or calculated using Equation 5, v. mL =v;

[0111] The required pressure during pouring is p. eh At that time, the pressure ps at the inlet of the electromagnetic shaftless pump booster device 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 length of the delivery pipe between the electromagnetic shaftless pump booster and the delivery device is calculated. L ≤(1-k)p eh ,Right now:

[0112]

[0113] The length L of the delivery pipe between the electromagnetic shaftless pump booster device and the delivery pipe is:

[0114]

[0115] The beneficial technical effects of this embodiment are as follows:

[0116] (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;

[0117] (2) It can increase the pumping height of pumped concrete;

[0118] (3) The electromagnetic shaftless pump booster has a large internal space in the pipeline, which is beneficial for pumping concrete.

[0119] (4) The length of the delivery pipe between the electromagnetic shaftless pump booster device can be calculated and determined when the delivery pipe is kept under constant pressure.

[0120] (5) Monitor the concrete pump inlet pressure at all times and adjust the speed of the electromagnetic shaftless pump booster in real time to save energy and reduce emissions.

[0121] (6) Adding an electromagnetic shaftless pump booster device to the hose can ensure that the pouring pressure meets the requirements and make the poured concrete more compact.

[0122] 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 constant-pressure pumping method for ultra-high-rise concrete, 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 booster device, which includes a booster assembly. The booster assembly includes a rotor assembly, a power assembly, 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 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 cylindrical protective cover is provided with an annular groove that cooperates with the annular slider. The rotating magnetic field generated by the power assembly drives the permanent magnet of the rotor assembly to rotate. A pressure sensor and a speed sensor are provided on the inner side of the support end cover. The power component, pressure sensor, and speed sensor on the electromagnetic shaftless pump booster are activated. The power component drives the electromagnetic shaftless pump booster to rotate. The rotational speed of the electromagnetic shaftless pump booster 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 booster devices is determined so that concrete can be pumped to the corresponding location on the high-rise building by the concrete mixer. Calculations are required for the rotational speed of the electromagnetic shaftless pump booster and the length of the delivery pipe between the electromagnetic shaftless pump booster devices. The calculation method for the rotational speed of the electromagnetic shaftless pump booster includes: The conveying pipe is set up with a total of m An electromagnetic shaftless pump booster device, the length of which is ∆ L The length of the delivery pipe between the electromagnetic shaftless pump booster device is L The electromagnetic shaftless pump booster and the inner diameter of the delivery pipe are both... d The self-weight of the pumped concrete is γ , g It is the acceleration due to gravity; The electromagnetic shaftless pump booster device pumps concrete vertically upwards, and the pressure loss ∆ experienced during concrete pumping is... p By ∆ p Vc and ∆ p γ It consists of two parts, where ∆ p Vc This refers to the frictional losses 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; ∆ p γ It is the pressure generated by the weight of concrete during vertical pumping, i.e., the total pressure loss ∆ of concrete pumped vertically upwards within the electromagnetic shaftless pump booster device. p FI for: ∆ p FI = ∆ p Vc +∆ p γ Formula 1; If the pumped concrete is ordinary concrete, the pressure loss per meter of vertical upward pumping is ∆. p Vcm for: Formula 2; In the formula: ∆ p Vcm It is the pressure loss per meter generated when concrete flows in a vertical delivery pipe; d It is the 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; The pressure ∆ per meter of concrete weight generated during vertical concrete pumping p γm for: ∆ p γm = γ Formula 3; Substituting equations 2 and 3 into equation 1, we can obtain the total pressure loss ∆ of the electromagnetic shaftless pump booster device for vertically pumping concrete upwards. p FI for: Equation 4; The pressure generated by the electromagnetic shaftless pump booster device on the pumped concrete p w for: Formula 5; In the formula: v The electromagnetic shaftless pump booster device provides the flow rate for concrete. ; ω It is the angular velocity of the electromagnetic shaftless pump booster device; 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; Assume the electromagnetic shaftless pump booster device requires an output concrete pressure of... p eh The axial pressure of the concrete entering the electromagnetic shaftless pump booster device is p s If the electromagnetic shaftless pump booster device outputs concrete pressure of p eh The electromagnetic shaftless pump booster device needs to provide the required pressure. p w for: Formula 6; Equation 5 equals Equation 6, so we can obtain the required output pressure for restoration. p eh At that time, the rotational speed of the electromagnetic shaftless pump booster device n for: Formula 7; 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 blade tip rotation speed is v 0=π nr 0 / 30, blade root rotation speed v 1 = π nr 1 / 30, will v 0 and v Substituting equation 7, we can obtain the rotational speed of the electromagnetic shaftless pump booster device to restore the required output pressure. n for: Formula 8; If the pumped concrete is high-strength concrete, the pressure loss per meter of vertical upward pumping is ∆. p Vum for: ∆ p Vcm =∆ p Vum =0.015+0.057 η Equation 9; In the formula: ∆ 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, the rotational speed of the electromagnetic shaftless pump booster device is required to restore the required output pressure. n for: Formula 10; The method for calculating the length of the delivery pipe between the electromagnetic shaftless pump booster devices includes: When the concrete is pumped to the next electromagnetic shaftless pump booster, 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 pressurization device is monitored by a velocity sensor or calculated using Equation 5. v mL = v ; The required pressure during pouring is... p eh At that time, set the pressure at the inlet of the electromagnetic shaftless pump booster device. 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 ≤ φ When this occurs, it indicates that the pressure inside the conveying pipe changes significantly and fails to meet the constant pressure conveying requirement. Therefore, a constant pressure conveying ratio is set. k =0.80, the concrete pressure loss ∆ within the length of the delivery pipe between the electromagnetic shaftless pump booster device and the pump. p L ≤(1- k ) p eh ,Right now: Equation 12; Length of delivery pipe between electromagnetic shaftless pump booster devices L for: Formula 13.

2. The method for constant pressure pumping of ultra-high-rise concrete as described in claim 1, 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.

3. The method for constant pressure pumping of concrete in ultra-high-rise buildings as described in claim 1, characterized in that... The electromagnetic shaftless pump booster device further includes a buffer assembly and a connecting pipe. Both ends of the booster assembly are connected to the connecting pipe through the buffer assembly. The buffer assembly includes an annular buffer seat, an annular buffer cavity disposed in 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 to the booster assembly at one end. 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 the annular buffer cavity.

4. The method for constant pressure pumping of concrete in ultra-high-rise buildings as described in claim 3, characterized in that: A rubber gasket is provided between the support end cap and the annular buffer seat, and the rubber gasket is fitted around the annular steel support.

5. The method for constant pressure pumping of ultra-high-rise concrete as described in claim 1, 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.

6. The method for constant pressure pumping of ultra-high-rise concrete as described in claim 1, characterized in that... The concrete feeder includes a storage bin and a base, with the storage bin installed on the base.

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