A double-stirring double-pump slurry conveying system suitable for cement mixing piles

Abstract

A double-stirring double-pump slurry conveying system suitable for cement mixing piles, comprising a mortar mixer, a rotary stirring material collecting device, a mortar pump, a slurry conveying hose, a mortar booster pump and a cement mixing pile machine; the rotary stirring material collecting device is arranged below the discharge port of the mortar mixer, a secondary stirring device is installed in the rotary stirring material collecting device, the discharge port of the rotary stirring material collecting device is connected with the inlet of the mortar pump through a pipeline, the outlet of the mortar pump is connected with the inlet of the cement mixing pile machine through the slurry conveying hose, and at least one mortar booster pump is installed on the slurry conveying hose. The device can effectively reduce the segregation and temperature difference of cement mortar, improve the stability of the flow of cement mortar in the slurry conveying pipe, and thus improve the pile integrity and pile permeability coefficient of the cement mixing pile, and reduce the slurry supplement cost and waste pile risk in the engineering construction process.

Description

Technical Field

[0001] This utility model relates to a double-stirring, double-pump grouting system suitable for cement mixing piles. Background Technology

[0002] Cement mixing piles are an effective form of soft soil foundation treatment. They utilize cement as the main curing agent, employing a mixing pile machine to inject cement into the soil and thoroughly mix it. This causes a series of physicochemical reactions between the cement and the soil, hardening the soft soil and increasing the foundation strength. Cement mixing piles are classified into single-axis, double-axis, and triple-axis mixing piles based on their main construction methods.

[0003] In the environmental protection field, cement mixing piles are often used as vertical barrier walls. When cement mixing piles are used as vertical barrier walls to block the spread of pollution in the environmental protection field, the requirements for the integrity of the pile body and the permeability coefficient of the pile body are even higher.

[0004] The conventional grouting system for cement mixing piles consists of a grout mixer, a hopper, a grout pump, and a grout pump control cabinet. After mixing, the cement grout collects in the hopper and is then lifted to the top of the grouting pipe of the cement mixing pile machine by its own weight and the suction of the grout pump. The current grouting system has the following three drawbacks:

[0005] I. According to the "Technical Specification for Foundation Treatment of Buildings" (JGJ 79-2012), the lifting speed of cement mixing piles needs to be controlled between 0.5 and 1.0 m / min. Therefore, for a 20m long cement mixing pile, a two-stage spraying and two-stage mixing process requires at least 40 minutes per pile, and a four-stage spraying and four-stage mixing process would take nearly one and a half hours per pile. Consequently, the cement slurry in the aggregate hopper has an average flow time of approximately 15 minutes per cycle, and the cement mortar is in an unmixed state within the hopper. As time increases, segregation of the cement mortar gradually occurs.

[0006] 2. Cement mortar comes out from the discharge port below the aggregate hopper. The force is the weight of the cement mortar itself and the suction of the mud pump. During the transportation process, due to the viscosity of the cement mortar itself, it cannot fall evenly, and several small voids will be formed in the conveying pipe.

[0007] 3. The grout delivery hose after the mud pump is 20-40 meters long, and in some ultra-deep boreholes it can even reach 60 meters, and it is used for vertical delivery of cement mortar. During the process of pumping cement mortar upwards by the mud pump, the pumping rate of the grout entering the hole is related to the pile diameter and the lifting rate. Moreover, the lifting force of the cement mortar is only the mud pump on the ground. Under the combined effects of its own gravity and retention time, the cement mortar in the delivery pipe exhibits a certain degree of segregation.

[0008] Fourth, under different climatic conditions, the temperature of cement mortar varies after mixing in the mixing drum. After entering the aggregate hopper, the temperature of the cement mortar gradually decreases over time. The setting and reaction temperatures of the soil and cement mortar within the cement-mixed pile are related. Furthermore, during grouting in winter, the cement mortar temperature is often too low. These inconsistent and excessively low cement mortar temperatures lead to inconsistent setting times in the cement-mixed piles, which is detrimental to the integrity of the pile body. Utility Model Content

[0009] This invention solves the problems of the prior art and provides a double-stirring and double-pump grouting system suitable for cement mixing piles. It can effectively reduce the segregation and temperature difference of cement mortar, improve the flow rate and temperature stability of cement mortar in the grouting pipe, thereby improving the integrity of the cement mixing pile and the pile permeability coefficient, and reducing the cost of grouting and the risk of pile failure during the construction process.

[0010] To achieve the first objective mentioned above, this utility model proposes a double-stirring, double-pump grouting system suitable for cement mixing piles, including a grout mixer, a rotary stirring aggregate device, a grout pump, a grouting hose, a grout booster pump, and a cement mixing pile machine; the rotary stirring aggregate device is located below the discharge port of the grout mixer, and a secondary stirring device is installed inside the rotary stirring aggregate device; the discharge port of the rotary stirring aggregate device is connected to the inlet of the grout pump through a pipeline, and the outlet of the grout pump is connected to the inlet of the cement mixing pile machine through the grouting hose; at least one stage grout booster pump is installed on the grouting hose.

[0011] In this embodiment, the rotary stirring type collecting device includes a collecting hopper and a stirring device. The stirring device includes a stirring motor and a stirring head. The stirring head includes a stirring shaft, stirring blades and a water-stop ring. The stirring motor is fixed on the outer wall of the collecting hopper. The stirring blades are arranged inside the collecting hopper. The stirring blades are connected to the output end of the stirring motor through the stirring shaft. The stirring shaft and the collecting hopper are sealed together by the water-stop ring.

[0012] In this embodiment, multiple mixing devices are provided, and the multiple mixing devices are evenly arranged around the central axis of the material collection funnel.

[0013] In this embodiment, the stirring device is located at one-third of the height of the material collection funnel from the bottom up.

[0014] In this embodiment, a heating collar and a temperature sensor are installed on the inner wall of the material collection funnel below the stirring device.

[0015] In this embodiment, the grout delivery hose is equipped with multiple grout booster pumps connected in series, with a spacing of 10 to 15 meters between the multiple grout booster pumps.

[0016] In this embodiment, the mortar pump includes a mortar pump inlet and a mortar pump outlet. An ultrasonic transmitter is installed in the mortar pump outlet, and an ultrasonic receiver matching the ultrasonic transmitter is installed in the inlet of the mortar booster pump.

[0017] In this embodiment, the mortar pump includes a mortar pump base and a mortar pump motor, a mortar pump transmission structure, and a mortar pump body fixed on the mortar pump base. The mortar pump motor is connected to the mortar pump body through the mortar pump transmission structure. The mortar pump body is provided with a mortar pump mortar inlet and a mortar pump mortar outlet. The mortar pump body is provided with mortar pump blades. The mortar pump motor drives the mortar pump blades to rotate through the mortar pump transmission structure.

[0018] In this embodiment, the mortar booster pump includes a booster pump cylinder, booster pump blades coaxially disposed within the booster pump cylinder, a booster pump motor for driving the booster pump blades to rotate, a booster pump motor connecting rod for fixing the booster pump motor within the booster pump cylinder, and an ultrasonic receiver disposed within the booster pump cylinder that matches the ultrasonic transmitter.

[0019] In this embodiment, multiple ultrasonic receivers are evenly distributed at the inlet end of the booster pump cylinder with the central axis as the center. The ultrasonic receivers are used to receive signals from the ultrasonic transmitter.

[0020] With the above structure, this utility model has the following advantages:

[0021] 1. This device is equipped with a secondary mixing device in the rotary mixing aggregate device, including a mixing motor and a mixing head evenly distributed around the central axis of the aggregate funnel, which agitates the cement mortar falling into the aggregate funnel; at the same time, it works with a mortar pump and a mortar booster pump installed on the mortar delivery hose, so that the cement mortar in the mortar delivery hose rotates continuously under the agitation of the blades, thereby effectively preventing the segregation of cement mortar in the aggregate funnel and the mortar delivery hose, ensuring mortar quality and construction effect.

[0022] 2. A heating ring and a temperature sensor are installed on the inner wall of the aggregate funnel. The temperature sensor provides real-time temperature feedback. When the cement mortar temperature is lower than the set temperature, the heating ring is activated to ensure that the cement mortar in the aggregate funnel is at a suitable temperature to meet construction requirements.

[0023] 3. An ultrasonic transmitter is installed at the mortar outlet of the mortar pump, and a matching ultrasonic receiver is installed at the inlet of the mortar booster pump. By analyzing the ultrasonic waves, the degree of cement mortar segregation in the grout delivery hose is detected, and the pump speed difference is adjusted accordingly. This allows for real-time monitoring of cement mortar segregation and timely adjustments, further ensuring the quality of grout delivery.

[0024] 4. This application allows for the addition of multiple grout booster pumps at intervals of 10-15m, depending on the height of the cement mixing pile machine, thus flexibly adapting to different construction scenarios and ensuring pressurization effect.

[0025] In summary, this invention can effectively reduce the segregation and temperature difference of cement mortar, improve the stability of cement mortar flow rate in the grouting pipe, thereby improving the integrity of the cement mixing pile and the pile permeability coefficient, and reducing the cost of grouting and the risk of pile failure during the construction process. Attached Figure Description

[0026] Figure 1 This is the overall structure diagram of the system.

[0027] Figure 2 is a top view of the rotary mixing aggregate device of this system.

[0028] Figure 3 is a front view of the rotary mixing aggregate device of this system.

[0029] Figure 4 is a schematic diagram of the mixing device inside the rotary mixing aggregate device of this system.

[0030] Figure 5 is a schematic diagram of the structure of the mixing head inside the rotary mixing aggregate device of this system.

[0031] Figure 6 is a front view of the grout pump in this system.

[0032] Figure 7 is a schematic diagram of the internal structure of the grout pump in this system.

[0033] Figure 8 is a bottom view of the mortar booster pump of this system.

[0034] Figure 9 is a front view of the mortar booster pump of this system.

[0035] In the attached diagram: 1. Mortar mixing platform; 2. Mortar mixing control cabinet; 3. Mortar mixer; 4. Rotary mixing aggregate collection device; 41. Mixing device; 42. Mixing head; 421. Mixing shaft; 422. Mixing blade; 423. Water stop ring; 43. Temperature sensor; 431. Mixing motor; 432. Fixed support; 433. Fixed base; 44. Heating collar; 45. Aggregate funnel; 47. Funnel discharge valve; 5. Mortar pump; 51. Mortar pump motor; 52. Grout pump transmission structure; 53. Grout pump base; 54. Grout pump body; 55. Grout pump mortar inlet; 56. Grout pump mortar outlet; 57. Grout pump impeller; 58. Ultrasonic transmitter; 6. Grout pump control cabinet; 7. Grout delivery hose; 8. Grout booster pump; 81. Booster pump impeller; 82. Booster pump motor; 83. Booster pump motor connecting rod; 84. Ultrasonic receiver; 85. Booster pump cylinder; 86. Grout delivery pipe clamp; 9. Cement mixing pile machine. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0038] like Figure 1 As shown in Figure 9, a double-stirring and double-pump grouting system suitable for cement mixing piles includes a grout mixing platform 1, a grout mixing control cabinet 2, a grout mixer 3, a rotary mixing aggregate device 4, a grout pump 5, a grout pump control cabinet 6, a grouting hose 7, a grout booster pump 8, and a cement mixing pile machine 9.

[0039] The mortar mixing control cabinet 2, the mortar mixer 3, and the rotary mixing aggregate device 4 are installed on the mortar mixing platform 1. The rotary mixing aggregate device 4 is located below the discharge port of the mortar mixer 3. A secondary mixing device is installed inside the rotary mixing aggregate device 4. The mortar mixing control cabinet 2 is used to control the mortar mixer 3 and the rotary mixing aggregate device 4.

[0040] The discharge port of the rotary mixing aggregate device 4 is connected to the inlet of the mortar pump 5 through a pipeline. The outlet of the mortar pump 5 is connected to the inlet of the cement mixing pile machine 9 through a mortar delivery hose 7. At least one mortar booster pump 8 is installed on the mortar delivery hose 7. The mortar pump 5 and the mortar booster pump 8 are controlled by the mortar pump control cabinet 6.

[0041] Using the above structure, the cement mortar of this device is mixed and homogenized by the mortar mixer 3, and then enters the rotary mixing aggregate device 4. It is then subjected to a secondary mixing device in the rotary mixing aggregate device 4 to prevent the cement mortar from segregating. Finally, the cement mortar in the rotary mixing aggregate device 4 is transported to the cement mixing pile machine 9 by the mortar pump 5 and the mortar booster pump 8.

[0042] like Figure 1 The mortar mixing platform 1 is arranged in the same way as conventional ones, and the mortar mixer 3 and the rotary mixing aggregate device 4 are controlled by the mortar mixing control cabinet 2.

[0043] The mortar mixer 3 is a conventional mortar mixer. Common mortar mixer models used in cement mixing pile construction are JW180 and JW200.

[0044] As shown in Figures 2 and 3, the rotary stirring type collecting device 4 adds three stirring devices 41 inside the conventional collecting funnel. Preferably, the three stirring devices 41 are evenly arranged around the central axis of the collecting funnel 45, and the stirring devices 41 are located at one-third of the height of the collecting funnel 45 from the bottom up. The stirring device includes a stirring motor 431 and a stirring head 42. The stirring head 42 includes a stirring shaft 421, stirring blades 422 and a water-stop ring 423. The stirring motor 431 is fixed to the outer wall of the collecting funnel 45 by a fixed support 432 and a fixed base 433. The stirring blades 42 are located inside the collecting funnel 45. The stirring blades 42 are connected to the output end of the stirring motor 431 through the stirring shaft 421. The stirring shaft 421 and the collecting funnel 45 are sealed together by the water-stop ring 423.

[0045] After the cement mortar is mixed by the mortar mixer 3, it first falls into the rotary mixing aggregate device 4. The mixing motor 431 is started, which drives the mixing head 42 to rotate, thereby agitating the cement mortar. The cement mortar is continuously agitated by the three mixing heads 42 in the aggregate funnel to prevent the cement mortar in the aggregate funnel 45 from segregating. When the discharge valve 47 of the funnel is opened, the cement mortar in the aggregate funnel 45 is transported to the mortar pump 5 through the mortar delivery hose 7.

[0046] As shown in Figures 2 and 3, the aggregate funnel 45 is further equipped with a heating collar 44 and a temperature sensor 43 on the inner wall below the mixing device 41. The temperature sensor 43 provides real-time feedback on the temperature inside the aggregate funnel 45. When the cement mortar is lower than the set temperature, the heating collar 44 is activated to ensure that the cement mortar inside the aggregate funnel 45 is at the set temperature.

[0047] As shown in Figures 6 and 7, the mortar pump 5 includes a mortar pump base 53 and a mortar pump motor 51, a mortar pump transmission structure 52, and a mortar pump body 54 fixed on the mortar pump base 53. The mortar pump motor 51 is connected to the mortar pump body 54 through the mortar pump transmission structure 52. The mortar pump body 54 is provided with a mortar pump mortar inlet 55 and a mortar pump mortar outlet 56. A mortar pump blade 57 is provided inside the mortar pump body 54. The mortar pump motor 51 drives the mortar pump blade 57 to rotate through the mortar pump transmission structure 52. An ultrasonic transmitter 58 is provided inside the mortar pump mortar outlet 56.

[0048] As shown in Figures 8 and 9, the mortar booster pump 8 includes a booster pump cylinder 85, a booster pump blade 81 coaxially arranged inside the booster pump cylinder 85, a booster pump motor 82 driving the booster pump blade 81 to rotate, a booster pump motor connecting rod 83 fixing the booster pump motor 82 inside the booster pump cylinder 85, and an ultrasonic receiver 84 matched with the ultrasonic transmitter 58, arranged inside the booster pump cylinder 85. Five ultrasonic receivers 84 are evenly distributed around the central axis at the inlet end of the booster pump cylinder 85. The ultrasonic receivers 84 receive the signal from the ultrasonic transmitter 58, analyze the ultrasonic waves emitted by the ultrasonic transmitter 58, detect the degree of cement mortar segregation in the grout delivery hose 7, determine the segregation status of the mortar in the grout delivery hose 7, and then, based on the mortar segregation status, adjust the speed difference between the mortar pump and the mortar booster pump 8 to make the cement mortar in the grout delivery hose 7 continuously rotate under the agitation of the blades, further preventing the cement mortar in the grout delivery hose from segregating.

[0049] When cement mortar is transported from the rotary mixing aggregate device 4 to the mortar pump 5 via the mortar delivery hose 7, the cement mortar enters the mortar pump body 54 through the mortar pump inlet 55. The cement mortar inside the mortar pump body 54 is pressurized by the combined action of the mortar pump motor 51, the mortar pump transmission structure 52, and the mortar pump blades 57, and then pumped upwards from the mortar pump outlet 56 through the mortar delivery hose 7 to the mortar booster pump 8. The cement mortar entering the mortar booster pump 8 via the mortar delivery hose 7 is further pressurized by the booster pump blades 81 and the booster pump motor 82, and then transported to the cement mixing pile machine 9, thereby preventing segregation. Simultaneously, the ultrasonic transmitter 58 located at the mortar pump 5 and the ultrasonic receiver 84 located in the mortar booster pump 8 use ultrasonic waves to detect the degree of cement mortar segregation within the mortar delivery hose 7, thus determining the segregation status of the mortar within the mortar delivery hose 7. Then, by using the speed difference between the mortar pump and the mortar booster pump 8, the cement mortar in the mortar delivery hose 7 is continuously rotated under the agitation of the blades, further preventing the segregation of the cement mortar in the mortar delivery hose.

[0050] Furthermore, the booster pump cylinder 85 is provided with a grouting pipe clip 86 on the outer wall near the inlet and outlet for easy installation of the grouting hose 7; in this embodiment, the grout booster pump 8 can be equipped with multiple stages of grout booster pump 8 according to the height of the cement mixing pile machine 9. The multiple stages of grout booster pump 8 are arranged at intervals of 10m or 15m to ensure the pressurization effect and prevent the cement mortar in the grouting hose from segregating.

[0051] Before commencing cement mixing pile operations using this system, determine the drilling speed, mortar mix ratio, pumping pressure, and grouting temperature based on the geological lithology. Based on the actual site conditions, construct the mortar mixing platform 1 and install the mortar mixing control cabinet 2, mortar mixer 3, rotary mixing aggregate device 4, mortar pump 5, and mortar pump control cabinet 6. At the start of operations, after positioning the cement mixing pile machine 9, ensure the grout delivery hose 7 and mortar booster pump 8 are connected to the entire grout delivery system. Upon commencement, the cement mortar is fed through the mortar mixer... 3. After mixing, the cement mortar is placed in the rotary mixing aggregate device 4 for later use. The cement mortar is kept at a constant temperature and rotated continuously in the rotary mixing aggregate device 4 to prevent segregation. When the cement mixing pile machine 9 drills to the target depth, grouting begins. At this time, the mortar pump 5 and the mortar booster pump 8 are started. The cement mortar in the rotary mixing aggregate device 4 is pumped into the cement mixing pile machine 9 through the mortar pump 5, the mortar booster pump 8 and the grout delivery hose 7. The cement mortar and the soil of the mixing pile begin to mix. After reciprocating drilling, the construction of the bored pile is completed.

[0052] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A dual-mixing, dual-pump grouting system suitable for cement mixing piles, comprising a grout mixer, a rotary mixing aggregate device, a grout pump, a grouting hose, a grout booster pump, and a cement mixing pile machine; characterized in that: The rotary mixing aggregate device is located below the discharge port of the mortar mixer. A secondary mixing device is installed inside the rotary mixing aggregate device. The discharge port of the rotary mixing aggregate device is connected to the inlet of the mortar pump through a pipeline. The outlet of the mortar pump is connected to the inlet of the cement mixing pile machine through a grout delivery hose. At least one mortar booster pump is installed on the grout delivery hose.

2. The double-stirring, double-pump grouting system for cement mixing piles according to claim 1, characterized in that: The rotary mixing type material collection device includes a material collection hopper and a mixing device. The mixing device includes a mixing motor and a mixing head. The mixing head includes a mixing shaft, mixing blades and a water-stop ring. The mixing motor is fixed on the outer wall of the material collection hopper. The mixing blades are set inside the material collection hopper. The mixing blades are connected to the output end of the mixing motor through the mixing shaft. The mixing shaft and the material collection hopper are sealed together by the water-stop ring.

3. The double-stirring, double-pump grouting system for cement mixing piles according to claim 2, characterized in that: Multiple mixing devices are provided, and these devices are evenly distributed around the central axis of the material collection hopper.

4. The double-stirring, double-pump grouting system for cement mixing piles according to claim 2, characterized in that: The mixing device is positioned at one-third of the axial height of the collection funnel from bottom to top.

5. The dual-stirring, dual-pump grouting system for cement mixing piles according to any one of claims 2 to 4, characterized in that: The material collection hopper is equipped with a heating collar and a temperature sensor on its inner wall below the mixing device.

6. The double-stirring, double-pump grouting system for cement mixing piles according to claim 1, characterized in that: The grout delivery hose is equipped with multiple grout booster pumps connected in series, with a spacing of 10 to 15 meters between the pumps.

7. The double-stirring, double-pump grouting system for cement mixing piles according to claim 1, characterized in that: The mortar pump includes a mortar pump inlet and a mortar pump outlet. An ultrasonic transmitter is installed in the mortar pump outlet, and an ultrasonic receiver that matches the ultrasonic transmitter is installed in the inlet of the mortar booster pump.

8. The double-stirring, double-pump grouting system for cement mixing piles according to claim 7, characterized in that: The mortar pump includes a mortar pump base and a mortar pump motor, a mortar pump transmission structure, and a mortar pump body fixed on the mortar pump base. The mortar pump motor is connected to the mortar pump body through the mortar pump transmission structure. The mortar pump body is provided with a mortar pump mortar inlet and a mortar pump mortar outlet. The mortar pump body is provided with mortar pump blades. The mortar pump motor drives the mortar pump blades to rotate through the mortar pump transmission structure.

9. The double-stirring, double-pump grouting system for cement mixing piles according to claim 7, characterized in that: The mortar booster pump includes a booster pump cylinder, booster pump blades coaxially mounted inside the booster pump cylinder, a booster pump motor that drives the booster pump blades to rotate, a booster pump motor connecting rod that fixes the booster pump motor inside the booster pump cylinder, and an ultrasonic receiver that matches the ultrasonic transmitter and is mounted inside the booster pump cylinder.

10. The double-stirring, double-pump grouting system for cement mixing piles according to claim 9, characterized in that: Multiple ultrasonic receivers are evenly distributed around the central axis at the inlet end of the booster pump cylinder. The ultrasonic receivers are used to receive signals from the ultrasonic transmitter.

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