Ultra-high pumping concrete shaft pump push joint force complex pumping system and working method

Abstract

This invention discloses a shaftless pump booster system and its operating method for pumping concrete in high-rise buildings. The system includes a concrete feeder, a delivery pipe and a grouting hose connected sequentially to the feeder, and a shaftless pump booster mounted on the delivery pipe. The booster includes a booster assembly, a buffer assembly, and a connecting pipe coaxially arranged. Both ends of the booster assembly are connected to the connecting pipe via the buffer assembly. The booster assembly includes a rotor assembly and a power assembly for driving the rotor assembly to rotate. The rotor assembly is equipped with a pressure sensor, a speed sensor, and blades. The advantages of this invention are: reducing the initial pumping pressure in high-rise buildings, ensuring construction safety, and simultaneously reducing the pressure requirements of the pumping equipment and the strength requirements of the delivery pipe, thus reducing equipment costs.

Description

Technical Field

[0001] This invention relates to the technical field of ultra-high-rise concrete pumping pipeline transportation, and in particular to an ultra-high-rise concrete pumping shaftless pump push-relay pressure pumping system and its working method. 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 CN111622779A, "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 CN103541550A, "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. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a shaftless pump booster system and its operating method for pumping concrete in ultra-high-rise buildings. This pumping system incorporates a shaftless pump booster device on the delivery pipe. In previous methods for pumping concrete in high-rise buildings, this shaftless pump booster device had blades on its inner wall. Pressure sensors monitored pressure changes and determined the blade rotation speed in real time. A motor drove the bladed steel cylinder to rotate, and the high-speed rotating blades provided pressure to the concrete, achieving the booster effect and ensuring that the concrete pumping pressure met requirements, thus guaranteeing the quality of the pouring. Simultaneously, the shaftless pump booster device was connected to the delivery pipe via a buffer assembly to buffer the concrete pressure and the impact load of the booster, ensuring the safety and stability of the delivery pipe.

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

[0006] A shaftless pump booster system for pumping concrete in high-rise buildings is disclosed. The system comprises a concrete feeder, a delivery pipe and a grouting hose connected sequentially to the concrete feeder, and a shaftless pump booster mounted on the delivery pipe. The shaftless pump booster includes a booster assembly, a buffer assembly, and a connecting pipe arranged coaxially. Both ends of the booster assembly are connected to the connecting pipe via the buffer assembly. The booster assembly includes a rotor assembly and a power assembly for driving the rotor assembly to rotate. The rotor assembly is equipped with a pressure sensor, a speed sensor, and blades.

[0007] The booster assembly also includes a cylindrical protective cover and a support end cover. The power assembly is installed inside the cylindrical protective cover, and the support end cover is located at both ends of the rotor assembly and the power assembly.

[0008] The rotor assembly includes a steel cylinder, a rotating gear ring, and an annular slider. The rotating gear ring is located at both ends of the steel cylinder, and the annular slider is located at both ends of the steel cylinder and cooperates with the annular groove of the supporting end cover. The blades are arranged circumferentially along the inner wall of the steel cylinder.

[0009] The power assembly includes several motor groups arranged circumferentially along the cylindrical protective cover. Each motor group consists of two motors arranged opposite each other. The two motors are respectively mounted on both sides of the motor base. A power gear is connected to the motor shaft of the motor. The power gear extends outside the cylindrical protective cover and meshes with the rotating gear ring.

[0010] The pressure sensor is arranged circumferentially along the steel cylinder, and each speed sensor is located between two adjacent pressure sensors; the pressure sensor includes pressure sensor one and pressure sensor two, and the speed sensor includes speed sensor one and speed sensor two. Pressure sensor one and speed sensor one are both located on the side of the rotating gear ring at the lower end of the pressurization assembly, and pressure sensor two and speed sensor two are both located on the side of the rotating gear ring at the upper end of the pressurization assembly.

[0011] 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 support end cap. 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 with the buffer springs corresponding to those in the annular buffer cavity. A rubber gasket is provided between the support end cap and the annular buffer seat, and the rubber gasket is fitted over the annular steel support.

[0012] 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.

[0013] A method for operating a shaftless pump booster system for ultra-high-rise concrete pumping, characterized in that the method includes: activating the motor, pressure sensor, and speed sensor on the shaftless pump booster device; driving the shaftless pump booster device to rotate via the motor; adjusting the rotation speed of the shaftless pump booster device using monitoring data from the pressure sensor and the speed sensor; and pumping concrete to the corresponding location on the high-rise building via a concrete delivery machine; wherein the rotation speed of the shaftless pump booster device needs to be calculated.

[0014] The method for calculating the rotational speed of the shaftless pump booster device includes:

[0015] Let the length of the shaftless pump booster device be ΔL, the inner diameter of the shaftless pump booster device be d, the self-weight of the pumped concrete be γ, and g be the acceleration due to gravity.

[0016] The shaftless pump booster unit 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 γIt is the pressure generated by the weight of concrete during vertical pumping, that is, the total pressure loss Δp of concrete pumped vertically upwards within the shaftless pump booster device. FI for:

[0017] Δp FI =Δp Vc +Δp γ Formula 1;

[0018] If the pumped concrete is ordinary concrete, the pressure loss along the flow rate Δp per meter during vertical upward pumping is... Vcm for:

[0019]

[0020] 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.

[0021] The pressure Δp generated per meter of concrete by its weight during vertical pumping γm for:

[0022] Δp γm =γ Equation 3;

[0023] 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 shaftless pump booster device. FI for:

[0024]

[0025] The pressure p generated by the shaftless pump booster on the pumped concrete w for:

[0026] p w =γv 2 / 2g=γ[v1 / (πnR / 30v0)] 2 / 2g Formula 5;

[0027] In the formula: v is the flow velocity provided to the concrete by the shaftless pump booster device, v=v1 / (ωR / v0)=v1(πnR / 30v0); ω is the angular velocity of the 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;

[0028] Assume the shaftless pump booster device requires an output concrete pressure of p. eh The axial pressure of the concrete entering the shaftless pump booster device is p. s If the shaftless pump pusher booster device outputs concrete pressure p eh The pressure p that the shaftless pump booster device needs to provide is... w for:

[0029]

[0030] 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 shaftless pump booster device is:

[0031]

[0032] The radial pressure p at the inlet of the shaftless pump booster device is monitored by a pressure sensor. d1 For ordinary concrete, the radial pressure p of the concrete in the conveying pipeline d1 With axial pressure p s1 If the ratio α = 0.90, then the axial pressure p of the concrete entering the shaftless pump booster device is... s1 =p d1 / α;

[0033] The concrete flow velocity at the inlet of the shaftless pump booster device is monitored by a velocity sensor, which measures v. m1 ;

[0034] 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 shaftless pump booster device to restore the required output pressure as follows:

[0035]

[0036] The method for calculating the rotational speed of the shaftless pump booster device also includes:

[0037] 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:

[0038] Δp Vcm =ΔpVum =0.015 + 0.057η (Equation 9);

[0039] 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.

[0040] Combining equations 3, 4, 5, 6, and 9, for high-strength concrete, the rotational speed n of the shaftless pump booster device to restore the required output pressure is:

[0041]

[0042] The advantages of this invention are:

[0043] (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;

[0044] (2) It can increase the pumping height of pumped concrete;

[0045] (3) The internal space of the pipeline of the shaftless pump booster device is large, which is beneficial to the pumping of concrete.

[0046] (4) Monitor the concrete pumping pressure at all times, adjust the speed of the shaftless pump booster in real time, save energy and reduce emissions, and ensure stable pumping pressure.

[0047] (5) Adding a 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

[0048] Figure 1 This is a schematic diagram of the present invention;

[0049] Figure 2 This is a schematic diagram of the shaftless pump booster device of the present invention;

[0050] Figure 3 This is a schematic cross-sectional view of the shaftless pump booster device of the present invention;

[0051] Figure 4 This is a circuit diagram of the control system of the present invention;

[0052] Figure 5 for Figure 3 Cross-sectional view of AA in the middle;

[0053] Figure 6 for Figure 3 Cross-sectional view of BB in the middle;

[0054] Figure 7 for Figure 3 Cross-sectional view of CC in the middle;

[0055] Figure 8 for Figure 3 Cross-sectional view of DD in the middle;

[0056] Figure 9 for Figure 3 Cross-sectional view of the EE;

[0057] Figure 10 for Figure 3 Cross-sectional view of FF in the middle;

[0058] Figure 11 for Figure 3 Cross-sectional view of GG in China;

[0059] like Figures 1-11 As shown in the figure, the markings represent:

[0060] a. Pumping system; b. Shaftless pump booster device; c. High-rise building;

[0061] 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;

[0062] 11. Rotor assembly, 12. Power assembly, 13. Cylindrical protective cover, 14. Support end cover, 15. Control system, 111. Steel cylinder, 112. Rotating gear ring, 113. Annular slider, 114. Blade, 121. Motor, 122. Motor shaft, 123. Motor base, 124. Power gear, 131. Inner side plate of cylindrical protective cover, 132. Outer side plate of cylindrical protective cover, 133. Annular protective cover cover plate, 134. Rectangular hole, 141. Annular groove, 151. Pressure sensor one, 152. Pressure sensor two, 153. Speed ​​sensor one, 154. Speed ​​sensor two, 155. Processor;

[0063] 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;

[0064] 31. Connecting cylinder; 32. Thread;

[0065] 71. Storage silo, 72. Concrete, 73. Base. Detailed Implementation

[0066] 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:

[0067] Example: Figure 1-11As shown, this embodiment relates to a shaftless pump booster system for pumping concrete in high-rise buildings (c). The system mainly includes a concrete feeder 7, a delivery pipe 4, a grouting hose 8, and a shaftless pump booster device b. The inlet of the delivery pipe 4 is connected to the concrete feeder 7 on the ground, and the outlet of the delivery pipe 4 extends upwards and connects to the grouting hose 8. Multiple shaftless pump booster devices b are provided, arranged on the delivery pipe 4, with a portion of the devices located on the delivery pipe. On the vertical section of 4, another part is arranged on the horizontal section of the conveying pipe 4, and 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 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 7 pumps the concrete 72, and the concrete 72 is pumped through the conveying pipe 4 and the grouting hose 8 to the concrete pumping position of the high-rise building c.

[0068] like Figure 1-2 As shown, the shaftless pump booster device b mainly includes a booster assembly 1, a buffer assembly 2, and a connecting pipe 3. The booster assembly 1, the buffer assembly 2, and the connecting pipe 3 are coaxially arranged. There are two buffer assemblies 2, which are respectively installed at both ends of the booster assembly 1. Correspondingly, there are also two connecting pipes 3, which are respectively connected to the two buffer assemblies 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 assembly 2, and the other end is connected to the conveying pipe 4 (grouting hose 8, concrete feeder 7) through the thread 32 on it.

[0069] like Figure 1-8 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 power assembly 12 is installed inside the cylindrical protective cover 13, and the support end cover 14 is located at both ends of the rotor assembly 11 and the power assembly 12. The power assembly 12 is located outside the rotor assembly 11 and can drive the rotor assembly 11 to rotate. The rotor assembly 11 includes a steel cylinder 111, a rotating gear ring 112, an annular slider 113, and blades 114. The rotating gear ring 112 is located at both ends of the steel cylinder 111, and the annular slider 113 is also located at both ends of the steel cylinder 111. An annular groove 141 is provided on the support end cover 14, which cooperates with the annular slider 113, allowing the annular slider 113 to rotate within the annular groove 141. One set of blades 114 is arranged circumferentially along the inner wall of the steel cylinder 111. The blades 114 are fan-shaped and inclined, and are located in the middle of the inner wall of the steel cylinder 111. The concrete pumping direction 5 is from bottom to top (e.g., ...). Figure 1 and Figure 3 As shown, blade 114 can withstand the impact of pumped concrete and guide the flow of pumped concrete.

[0070] The power assembly 12 includes several motor units located inside the cylindrical protective cover 13 and arranged circumferentially along the cylindrical protective cover 13. Each motor unit consists of two opposing motors 121, which are respectively mounted on both sides of the motor base 123. A drive gear 124 is connected to the motor shaft 122 of the motor 121. The drive gear 124 extends through a rectangular hole 134 on the cylindrical protective cover 13 to the outside of the cylindrical protective cover 13 and meshes with a rotating gear ring 112. The motor 121 drives the drive gear 124 on the motor shaft 122 to rotate, which in turn drives the rotating gear ring 112 to rotate, causing the annular slider 113 to rotate within the annular groove 141, thereby causing the blades 114 on the steel cylinder 111 to rotate (see section 6 for the rotation direction of the shaftless pump booster device). Figure 1 and Figure 3 As shown, the high-speed rotating blades 114 provide pressure to the concrete to achieve the purpose of pressurization, ensuring that the concrete pumping pressure meets the requirements and guaranteeing the construction quality of the pouring. In addition, the cylindrical protective cover 13 includes an inner cylindrical protective cover plate 131, an outer cylindrical protective cover plate 132, and an annular protective cover cover plate 133, which is connected to the support end cover 14.

[0071] 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. The pressure sensor and speed sensor are both circumferentially arranged on the steel cylinder 111, and 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 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 located on the side of the lower rotating gear ring 112 of the pressurization assembly 1, and pressure sensor two 152 and speed sensor two 154 are both located on the side of the upper rotating gear ring 112 of the pressurization assembly 1, which can improve the accuracy of the measurement results.

[0072] like Figure 1-2As shown in Figures 9-11, 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 buffering. 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.

[0073] like Figure 1-11 As shown, this embodiment also has the following working method:

[0074] The motor, pressure sensor, and speed sensor on the shaftless pump booster are activated. The motor drives the shaftless pump booster to rotate, and the rotation speed of the booster is adjusted using monitoring data from the pressure and speed sensors. Concrete is then pumped to the corresponding location on the high-rise building using a concrete mixer. In this embodiment, the booster value is determined using monitoring data; that is, the required booster value is determined by monitoring the pressure, which in turn determines the rotation speed of the booster component.

[0075] Specifically, the rotational speed of the shaftless pump booster device needs to be calculated. The calculation method for the rotational speed of the shaftless pump booster device includes:

[0076] Let the length of the shaftless pump booster device be ΔL, the inner diameter of the shaftless pump booster device be d (in meters), and the self-weight of the pumped concrete be γ (in N / m). 3 Where g is the acceleration due to gravity, g = 9.8 m / s² 2 ;

[0077] The shaftless pump booster unit pumps concrete vertically upwards. The pressure loss Δp experienced by the concrete during pumping is mainly due to Δp Vc and Δpγ 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 within the shaftless pump booster device. FI for:

[0078] Δp FI =Δp Vc +Δp γ Formula 1;

[0079] If the pumped concrete is ordinary concrete, the pressure loss along the flow rate Δp per meter during vertical upward pumping is... Vcm for:

[0080]

[0081] 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.

[0082] The pressure Δp generated per meter of concrete by its weight during vertical pumping γm (Unit: Pa / m) is:

[0083] Δp γm =γ Equation 3;

[0084] 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 shaftless pump booster device. FI for:

[0085]

[0086] The pressure p generated by the shaftless pump booster on the pumped concrete w (Unit: Pa / m) is:

[0087] p w =γv 2 / 2g=γ[v1 / (πnR / 30v0)] 2 / 2g Formula 5;

[0088] In the formula: v is the flow velocity provided to the concrete by the shaftless pump booster device, in m / s, v=v1 / (ωR / v0)=v1 / (πnR / 30v0); ω is the angular velocity of the shaftless pump booster device, 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;

[0089] Assume the shaftless pump booster device requires an output concrete pressure of p. eh The axial pressure of the concrete entering the shaftless pump booster device is p. s If the shaftless pump pusher booster device outputs concrete pressure p eh The pressure p that the shaftless pump booster device needs to provide is... w for:

[0090]

[0091] 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 shaftless pump booster device is:

[0092]

[0093] The radial pressure p at the inlet of the shaftless pump booster device is monitored by a pressure sensor. d1 For ordinary concrete, the radial pressure p of the concrete in the conveying pipeline d1 With axial pressure p s1 If the ratio α = 0.90, then the axial pressure p of the concrete entering the shaftless pump booster device is... s1 =p d1 / α;

[0094] The concrete flow velocity at the inlet of the shaftless pump booster device is monitored by a velocity sensor, which measures v. m1 ;

[0095] Let r0 be the radius from the center of rotation to the blade tip (in meters), and r1 be the radius from the center of rotation to the blade root (in meters) = d / 2. Then, 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 shaftless pump booster device to restore the required output pressure as follows:

[0096]

[0097] 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:

[0098] Δp Vcm =Δp Vum =0.015 + 0.057η (Equation 9);

[0099] 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;

[0100] Combining equations 3, 4, 5, 6, and 9, for high-strength concrete, the rotational speed n of the shaftless pump booster device to restore the required output pressure is:

[0101]

[0102] The beneficial technical effects of this embodiment are as follows:

[0103] (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;

[0104] (2) It can increase the pumping height of pumped concrete;

[0105] (3) The internal space of the pipeline of the shaftless pump booster device is large, which is beneficial to the pumping of concrete.

[0106] (4) Monitor the concrete pumping pressure at all times, adjust the speed of the shaftless pump booster in real time, save energy and reduce emissions, and ensure stable pumping pressure.

[0107] (5) Adding a shaftless pump booster device to the hose can ensure that the pouring pressure meets the requirements and make the poured concrete more compact.

[0108] 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 working method for a shaftless pump-assisted, multi-pressure pumping system for ultra-high-rise concrete pumping, characterized in that... The pumping system is used for pumping concrete in high-rise buildings. The system includes a concrete feeder, a delivery pipe and a grouting hose connected sequentially to the concrete feeder, and a shaftless pump booster installed on the delivery pipe. The shaftless pump booster includes a booster assembly, a buffer assembly, and a connecting pipe arranged coaxially. Both ends of the booster assembly are connected to the connecting pipe through the buffer assembly. The booster assembly includes a rotor assembly and a power assembly for driving the rotor assembly to rotate. The rotor assembly is equipped with a pressure sensor, a speed sensor, and blades. The booster assembly also includes a cylindrical protective cover and a support end cover. The power assembly is installed inside the cylindrical protective cover, and the support end cover is located at both ends of the rotor assembly and the power assembly. The rotor assembly includes a steel cylinder, a rotating gear ring, and an annular slider. The rotating gear ring is located at both ends of the steel cylinder, and the annular slider is located at both ends of the steel cylinder and cooperates with the annular groove of the supporting end cover. The blades are arranged circumferentially along the inner wall of the steel cylinder. The power assembly includes several motor groups arranged circumferentially along the cylindrical protective cover. Each motor group consists of two motors arranged opposite each other. The two motors are respectively mounted on both sides of the motor base. A power gear is connected to the motor shaft of the motor. The power gear extends outside the cylindrical protective cover and meshes with the rotating gear ring. The pressure sensor is arranged along the circumference of the steel cylinder, and each speed sensor is located between two adjacent pressure sensors; the pressure sensor includes pressure sensor one and pressure sensor two, and the speed sensor includes speed sensor one and speed sensor two. Pressure sensor one and speed sensor one are both located on the side of the rotating gear ring at the lower end of the pressurization assembly, and pressure sensor two and speed sensor two are both located on the side of the rotating gear ring at the upper end of the pressurization assembly. 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 support end cap. 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 with the buffer springs corresponding to those in the annular buffer cavity. A rubber gasket is provided between the support end cap and the annular buffer seat, and the rubber gasket is fitted over the annular steel support. The annular buffer seat is composed of a cylindrical inner buffer steel plate, a cylindrical outer 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. The working method includes: turning on the motor, pressure sensor, and speed sensor on the shaftless pump booster device; driving the shaftless pump booster device to rotate through the motor; adjusting the rotation speed of the shaftless pump booster device using the monitoring data from the pressure sensor and the speed sensor; and pumping concrete to the corresponding location of the high-rise building using a concrete mixer; wherein, the rotation speed of the shaftless pump booster device needs to be calculated. The method for calculating the rotational speed of the shaftless pump booster device includes: Let the length of the shaftless pump booster device be Δ. L The inner diameter of the delivery pipe is d The unit weight of the pumped concrete is γ , g It is the acceleration due to gravity; The shaftless pump pusher booster device pumps concrete vertically upwards, and the total pressure loss Δ during the vertical upward pumping of concrete within the shaftless pump pusher booster device 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, that is, the total pressure loss Δ of concrete pumped vertically upwards within the shaftless pump booster device. 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; The pressure Δ generated per unit vertical height of concrete by its own weight during vertical pumping 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 being pumped vertically upwards in the shaftless pump booster device. p FI for: Equation 4; The pressure generated by the shaftless pump booster on the pumped concrete p w for: Formula 5; In the formula: v The flow rate provided to the concrete by the shaftless pump booster device. ; ω It is the angular velocity of the 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 shaftless pump booster device requires an output concrete pressure of... p eh The axial pressure of the concrete entering the shaftless pump booster device is p s If the shaftless pump pusher booster device outputs concrete pressure as p eh The pressure required by the shaftless pump booster device 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 shaftless pump booster device n for: Formula 7; The radial pressure of the concrete at the inlet of the shaftless pump booster device is monitored by a pressure sensor. p d1 For ordinary concrete, the radial pressure of concrete in the conveying pipeline p d1 With axial pressure p s1 ratio α = 0.90, then the axial pressure of the concrete entering the shaftless pump booster device is... p s1 = p d1 / α ; The concrete flow velocity at the inlet of the shaftless pump booster device is monitored by a speed sensor. v m1 ; 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 velocity is v 0=π nr 0 / 30, leaf root speed v 1 = π nr 1 / 30, will v 0 and v Substituting equation 7 into equation 1, we can obtain the rotational speed of the shaftless pump booster device to restore the required output pressure. n for: Formula 8.

2. The working method of the shaftless pump push-relay super-pressure pumping system for ultra-high-rise concrete pumping as described in claim 1, characterized in that... The method for calculating the rotational speed of the shaftless pump booster device also includes: 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, the rotational speed of the shaftless pump booster device is required to restore the required output pressure. n for: Formula 10.

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