A dust removal system device for powder spraying and mixing piles

Abstract

This utility model relates to a dust removal system for powder jet grouting piles, comprising a primary dust removal component and a secondary dust removal component. The primary dust removal component is installed on the powder jet grouting pile drilling rig and includes an exhaust pipe and a dust suction unit for suctioning dust. The secondary dust removal component includes a pulse-jet bag filter. The suction inlet of the dust suction unit faces the opening of the powder jet grouting pile hole. One end of the exhaust pipe is connected to the outlet of the dust suction unit, and the other end of the exhaust pipe is connected to the dust inlet of the pulse-jet bag filter. By setting up a primary and secondary dust removal component, the primary dust removal component collects the air and dust flow at the opening of the powder jet grouting pile hole and sucks it into the secondary dust removal component for two more dust removal processes. The air and dust flow is then guided into the pulse-jet bag filter to remove the remaining fine dust, thereby improving the dust removal effect, improving the construction environment of powder jet grouting piles, and solving the problem of protecting the construction site and surrounding environment of powder jet grouting piles.

Description

Technical Field

[0001] This utility model belongs to the field of application technology and construction equipment technology for the reinforcement of weak foundations in geotechnical engineering, and particularly relates to a dust removal system device for powder jet mixing piles. Background Technology

[0002] Powder jet grouting is a common foundation treatment method used for reinforcing soft soil foundations. The construction process involves using a deep-jet mixing drill to inject cement, lime, fly ash, slag powder, fine sand, and other solidifying agent powders into the soft soil foundation using high-pressure gas. The drill bit then powerfully mixes the powders with the soil, causing a physicochemical reaction between the solidifying material and clay particles to form a new soil structure, ultimately creating a cylindrical solidified pile with a certain strength. Compared to wet jet grouting, powder jet grouting has several advantages. First, it saves on the amount of solidifying material used, making it more economical. Second, it achieves higher solidified soil strength, more effectively reducing foundation settlement and preventing liquefaction due to vibration, thus improving the stability of the solidified pile and significantly enhancing the bearing capacity and overall stability of the foundation.

[0003] However, there are significant problems during the construction of powder jet grouting piles. When high-pressure gas is used to inject the curing agent powder into the soil layer, some of the curing agent powder "escapes" during the return of the high-pressure gas to the surface, overflowing through the gaps between the drill rod and the surrounding soil. This escaped powder spreads throughout the construction site and surrounding areas, creating large amounts of dust and causing severe air pollution. The large amount of dust permeating the construction site and surrounding areas not only reduces visibility, affecting traffic and the normal lives of nearby residents, but also poses a significant threat to the physical and mental health of construction workers and residents, potentially leading to respiratory illnesses and other health problems. Furthermore, dust pollution damages the surrounding ecological environment, affecting plant growth and ecological balance. Due to dust pollution issues, the application of powder jet grouting pile technology is strictly limited in some urban areas with high environmental protection requirements, hindering its further promotion and development. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a dust removal system device for powder spraying and mixing piles, so as to improve the construction environment of powder spraying and mixing piles and solve the problem of protecting the construction site and surrounding environment of powder spraying and mixing piles.

[0005] The purpose of this utility model is achieved through the following technical solution: This dust removal system for powder jet grouting piles includes a primary dust removal component and a secondary dust removal component. The primary dust removal component is installed on the powder jet grouting pile drilling rig and includes an exhaust pipe and a dust suction unit for suctioning dust. The secondary dust removal component includes a pulse-jet bag filter. The suction inlet of the dust suction unit faces the opening of the powder jet grouting pile hole. One end of the exhaust pipe is connected to the outlet of the dust suction unit, and the other end of the exhaust pipe is connected to the dust inlet of the pulse-jet bag filter.

[0006] The beneficial effects of this utility model are as follows: Compared with the prior art, by setting up a primary dust removal component and a secondary dust removal component, the primary dust removal component collects the air and dust flow at the orifice of the powder jet mixing pile hole and sucks it from the primary dust removal component into the secondary dust removal component for two more dust removal processes. The air and dust flow is then introduced into a pulse-jet bag filter to remove the remaining fine dust, thereby improving the dust removal effect, improving the construction environment of the powder jet mixing pile, and solving the problem of protecting the construction site and surrounding environment of the powder jet mixing pile.

[0007] Preferably, the primary dust removal component includes a dust cover, which is installed on the drill rod of the powder jet grouting pile drilling rig and is used to collect the air and dust flow returning upward from the drill hole. The diameter of the dust cover opening is larger than the diameter of the powder jet grouting pile. The top of the dust cover is provided with an exhaust port, which is connected to an exhaust pipe. The exhaust pipe is connected to the pulse-jet bag filter. The above structure can ensure the prevention of air and dust flow diffusion and improve the reliability of air and dust flow collection.

[0008] Preferably, a sealing structure is provided between the opening of the dust cover and the drill rod to prevent air and dust leakage, and a dust cover body unit is provided at the lower part of the dust cover; through the above structure, it is ensured that the sealing performance between the two will not be affected whether the powder jet mixing pile is raised, lowered or rotated.

[0009] Preferably, the inner wall of the sealing structure fits tightly onto the drill rod. The sealing structure includes a cover plate, a sealing ring, and a mud scraper sleeve. The mud scraper sleeve is located on the opening of the dust cover, and the sealing ring is located on the mud scraper sleeve. The cover plate is fixed to the opening of the dust cover by bolts, which also limits and fixes the sealing ring and the mud scraper sleeve. The centers of the cover plate, the sealing ring, the mud scraper sleeve, and the opening of the dust cover are all concentric. By setting up the above structure, the sealing performance of the powder jet mixing pile during lifting or rotation can be further improved.

[0010] Preferably, the dust cover unit includes two semi-cylindrical dust covers, each with a sealing gasket on its side wall. The two dust covers are connected and fixed together by the sealing gasket and bolts. A sealing ring is sandwiched inside the sealing gasket. This structure facilitates the assembly and disassembly of the dust cover unit and further improves the sealing performance through the sealing gasket and sealing ring.

[0011] Preferably, the primary dust removal component includes an induced draft fan device, which includes an induced draft fan and a fixed frame. The induced draft fan is detachably connected to the fixed frame, and the fixed frame is installed on a guide support seat at the front of the powder jet mixing pile drilling rig. The above structure facilitates the assembly and disassembly of the induced draft fan device and the guide support seat.

[0012] Preferably, the induced draft fan includes an air inlet and an air outlet; the air inlet faces the opening of the powder spraying and mixing pile hole, and the air outlet is connected to the dust inlet of the pulse-jet bag filter through the exhaust pipe; the above structure facilitates the efficient intake of the air and dust flow generated at the opening of the powder spraying and mixing pile hole by the induced draft fan, and timely intake it into the pulse-jet bag filter.

[0013] Preferably, the pulse-jet bag filter includes a dust inlet, an ash outlet, and a material collection unit. The pulse-jet bag filter is installed on the pile driver of the powder jet grouting pile drilling rig, and the material collection unit is installed on the pile driver of the powder jet grouting pile drilling rig. The material collection unit is located directly below the ash outlet, which makes construction more convenient and the overall volume more compact. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0015] Figure 2 This is a schematic diagram of the dust cover device of this utility model;

[0016] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0017] Figure 4 This is a cross-sectional schematic diagram of Embodiment 1 of the utility model;

[0018] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0019] Figure 6 for Figure 5 A magnified view of a portion of the image;

[0020] Figure 7 This is a cross-sectional schematic diagram of Embodiment 2 of the present invention;

[0021] The labels in the attached diagram are as follows: 1. Dust cover; 11. Sealing structure; 111. Cover plate; 112. Sealing ring; 113. Sludge scraper sleeve; 12. Dust cover body unit; 121. Dust cover body; 122. Sealing gasket; 123. Sealing rubber ring; 124. Exhaust port; 125. Extension plate; 126. Assembly hook; 2. Exhaust pipe; 3. Pulse bag filter; 31. Dust inlet; 32. Ash outlet; 33. Collection unit; 4. Guide support seat; 5. Exhaust fan device; 51. Exhaust fan; 52. Fixing frame; 53. Air inlet; 54. Air outlet; 6. Drill rod. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings:

[0023] This utility model includes a primary dust removal component and a secondary dust removal component. The primary dust removal component is installed on the powder jet grouting pile drilling rig and includes an exhaust pipe 2 and a dust suction unit for suctioning dust. The secondary dust removal component includes a pulse-jet bag filter 3. The suction inlet of the dust suction unit faces the opening of the powder jet grouting pile hole. One end of the exhaust pipe 2 is connected to the outlet of the dust suction unit, and the other end of the exhaust pipe 2 is connected to the dust inlet 31 of the pulse-jet bag filter 3. The pulse-jet bag filter 3 is installed on the pile driver of the powder jet grouting pile drilling rig.

[0024] The primary dust removal component includes a dust cover 1, which is installed on the drill rod 6 of the powder jet grouting pile drilling rig and is used to collect the air and dust flow returning upward from the drill hole. The diameter of the opening of the dust cover 1 is larger than the diameter of the powder jet grouting pile. The top of the dust cover 1 is provided with an exhaust port 124, which is connected to an exhaust pipe 2. The exhaust pipe 2 is connected to a pulse-jet bag filter 3. A sealing structure 11 is provided between the opening of the dust cover 1 and the drill rod 6 to prevent air and dust flow leakage. The lower part of the dust cover 1 is provided with a dust cover body unit 12. The inner wall of the sealing structure 11 is tightly fitted to the drill rod 6. The sealing structure 11 includes a cover plate 111, a sealing ring 112, and a scraper. The dust cover 113 is located on the opening of the dust cover 1, and the sealing ring 112 is located on the scraper sleeve 113. The cover plate 111 is fixed to the opening of the dust cover 1 by bolts, which limits and fixes the sealing ring 112 and the scraper sleeve 113. The center of the cover plate 111, the sealing ring 112, the scraper sleeve 113 and the opening of the dust cover 1 are all concentric. The dust cover body unit 12 includes two semi-cylindrical dust cover bodies 121. The side wall of the dust cover body 121 is provided with a sealing gasket 122. The two dust cover bodies 121 are connected and fixed by bolts through the sealing gasket 122. A sealing rubber ring 123 is sandwiched on the inner side of the sealing gasket 122.

[0025] The primary dust removal component includes an induced draft fan device 5, which includes an induced draft fan 51 and a fixed frame 52. The induced draft fan 51 is detachably connected to the fixed frame 52, and the fixed frame 52 is installed on the guide support seat 4 at the front of the powder jet mixing pile drilling rig. The induced draft fan 51 includes an air inlet 53 and an air outlet 54. The air inlet 53 faces the opening of the powder jet mixing pile hole, and the air outlet 54 is connected to the dust inlet 31 of the pulse bag dust collector 3 through an exhaust pipe 2.

[0026] Example 1

[0027] The project background of this embodiment is a powder jet grouting and mixing pile foundation treatment project for a commercial building in an urban area. The designed pile length of the powder jet grouting and mixing pile is 16m, the pile diameter is 600mm, and the 7-day design strength of the mixing pile is 1.0MPa. The basic geological conditions of the site are as follows: the underlying foundation soil is a silty clay layer with a thickness of 30m, a water content of w=55%, e=1.3, a compressibility coefficient of 0.6MPa⁻¹, and a liquid limit of 40%. KD curing agent is used, requiring the curing agent particle size to be no greater than 70μm, and the curing agent dosage to be 15%. The construction process adopts a two-mixing and one-jetting method, using a single-channel multi-layer shear mixing pile drilling rig to carry out rotary jet mixing and pile formation; the construction requirements are that the jetting pressure of the gas-solid two-phase flow at the water tap inlet should not be less than 0.38MPa, and the initial compressed air pressure provided by the gas source should not be less than 0.6MPa. The measured bearing capacity of the foundation after treatment is approximately 140kPa.

[0028] Considering the high requirements for the surrounding environment in urban areas, this project adopts a combination of dust cover devices and pulse-jet bag filters for dust treatment.

[0029] like Figures 1 to 4 As shown, this example provides a dust removal system for powder jet grouting piles. It includes a primary dust removal component, which includes an exhaust pipe 2 and a dust cover 1. The dust cover 1 is installed on the drill rod 6 of the powder jet grouting pile drilling rig and is used to collect the air and dust flow returning upward from the drill hole. The diameter of the opening of the dust cover 1 is larger than the diameter of the powder jet grouting pile. A sealing structure 11 is provided between the dust cover 1 and the drill rod 6 to prevent air and dust flow leakage. A dust cover body structure 12 is fixedly connected to the lower part of the dust cover 1. An exhaust port 124 is provided at the top of the dust cover 1, and the exhaust port 124 is connected to the exhaust pipe 2.

[0030] As can be seen from the above embodiments, by setting up a dust cover 1, the sealing structure 11 of the dust cover 1 is fixed on the powder spraying mixing pile, and the diameter of the cover opening is larger than the diameter of the powder spraying mixing pile, ensuring that the sealing performance between the two will not be affected whether the powder spraying mixing pile is raised, lowered or rotated; through the dust cover body structure 12, a closed space is formed with the ground, effectively increasing the area for collecting the air and dust flow returning from the borehole, thereby causing the escaped high-pressure gas flow velocity to decrease suddenly, avoiding the dust cover body structure 12 being pushed out by the high-pressure gas, and improving its reliability in collecting air and dust flow; the air and dust flow enters the exhaust pipe 2 through the exhaust port 124, improving its dust removal efficiency; the air and dust flow discharged from the dust cover 1 is then subjected to dust removal treatment, and the air and dust flow is introduced into the pulse dust collector to remove the remaining fine dust, thereby improving the dust removal effect.

[0031] This embodiment provides a method for using the dust removal system device for powder spraying and mixing piles as described above, including the following steps:

[0032] S1. Based on site conditions, select dust cover device 1 and pulse bag dust collector 3;

[0033] S2. After the site is leveled, the powder jet grouting pile drilling rig is assembled. After one or more sections of drill rod 6 are assembled, the drill rod is inserted into the sealing structure 11 and installed on the drill rod. The powder jet grouting pile drill bit is installed under the support of the assembly hook 126 and the guide support seat 4. The support of the assembly hook 126 and the guide support seat 4 is removed to complete the assembly of the powder jet grouting pile drilling rig.

[0034] S3. Pile location positioning, and placement of the powder jet grouting pile drilling rig;

[0035] S4. Fix the dust cover structure 12 to the ground using a drilling rig, and press the extension plate 125 at the bottom of the dust cover structure 12 into the surface soil.

[0036] S5. Start the construction backstage and drilling rig of the powder spraying and mixing pile. The air and dust flow returned during the drilling process will be concentrated in the dust cover. After being collected, it will enter the dust inlet of the pulse bag dust collector through the exhaust port and exhaust pipe. After being treated by the pulse bag dust collector, it will be discharged to the collection unit through the ash outlet.

[0037] S6. After the construction is completed, shut down the powder jet grouting pile construction backstage and drilling rig, lift the drill bit, and move it with the drilling rig to the next new pile location, repeating the construction steps from S4 to S6 above.

[0038] Example 2

[0039] The engineering background of this embodiment is a powder jet grouting subgrade project for a highway in the suburbs. The designed pile length of the powder jet grouting pile is 19.6 m, the pile diameter is 700 mm, and the 7-day design strength of the mixing pile is 1.2 MPa. The basic geological conditions of the site are as follows: the site is covered by two layers of foundation soil. The first layer is a silty soil layer, 16 m thick, with a water content of w = 65%, a void ratio of e = 1.4, a compression coefficient of 0.55 MPa⁻¹, and a liquid limit of 35%. The second layer is a silty clay layer, 13 m thick, with a water content of w = 62%, a void ratio of e = 0.9, a compression coefficient of 0.65 MPa⁻¹, and a liquid limit of 42%. The curing agent used is Conch brand PO42.5 cement, with a particle size not exceeding 60 μm and a dosage of 16%. The construction adopts a powder jet grouting pile drilling rig to implement the powder curing agent injection and mixing pile forming process, specifically adopting a two-mixing-one-jetting drilling and jetting construction process. The construction requirements stipulate that the injection pressure of the gas-solid two-phase flow at the faucet inlet should be 0.35 MPa, the initial compressed air pressure supplied by the air source should be 0.7 MPa, and the air pressure inside the tank should be 0.3 MPa. Furthermore, the measured bearing capacity of the foundation after treatment should be approximately 120 kPa.

[0040] Considering that suburban construction has a smaller impact on the surrounding environment, this project adopts a combination of induced draft fan and pulse-jet bag filter.

[0041] like Figures 5 to 7 As shown, the difference between this embodiment and Embodiment 1 is that the second primary dust removal component of the dust removal system device for powder spraying and mixing piles includes an induced draft fan device 5, which includes an induced draft fan 51 and a fixed frame 52. The fixed frame 52 is fixedly connected to the side of the guide support seat 4 by welding, and the induced draft fan 51 is detachably connected to the fixed frame 4.

[0042] In this embodiment, the induced draft fan 51 mainly utilizes the effect of rotational centrifugal force. When gas carrying a certain amount of dust particles enters the induced draft fan, the dust particles are transported to the outlet 54 through the induced draft fan 51 pipe, pass through the exhaust pipe 2, and reach the dust inlet of the pulse bag filter 3. When the dust flow enters the pulse bag filter 3 from the dust inlet 31, larger dust particles will fall into the dust outlet 32 ​​due to gravity and inertia, while smaller dust particles will rise with the airflow. The dust flow entering the middle chamber changes the airflow direction through the flow guiding device, promoting the contact between dust particles and filter bags and causing the dust particles to adhere to the outer surface of the filter bags. The filtered gas passes through the filter bags into the upper chamber and is then discharged from the outlet, thereby achieving the purpose of dust removal.

[0043] This embodiment provides a method for using the dust removal system device for powder spraying and mixing piles as described above, including the following steps:

[0044] S1. Based on site conditions and the minimal impact of construction on the surrounding environment, select an induced draft fan, a spray structure, and a pulse-jet bag filter.

[0045] S2. After the site is leveled, the powder jet grouting pile drilling rig is assembled. After one or more sections of drill rod 6 are assembled, the fixed frame 52 is welded to the guide support seat 4. Then, the blower is installed on the fixed frame 52, and the drill rod 6 is lifted and the mixing drill bit is installed to complete the assembly of the powder jet grouting pile drilling rig.

[0046] S3. Pile location positioning, and placement of the powder jet grouting pile drilling rig;

[0047] S4. Start the powder jet mixing pile construction backstage and drilling rig. During the drilling process, the gas and dust flow returned by the drilling rig enters the exhaust pipe through the induced draft fan, enters the dust gas inlet of the pulse bag dust collector through the exhaust pipe, and is discharged to the collection unit through the ash outlet after being treated by the pulse bag dust collector.

[0048] After S5 is completed, shut down the powder jet grouting pile construction backstage and drilling rig, lift the drill bit, and move it with the drilling rig to the next new pile location, repeating the construction steps from S4 to S5.

[0049] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A dust removal system device for powder jet grouting and mixing piles, comprising a primary dust removal component and a secondary dust removal component, characterized in that: The primary dust removal assembly is installed on the powder jet mixing pile drilling machine. The primary dust removal assembly includes an exhaust pipe (2) and a dust suction unit for suctioning dust. The secondary dust removal assembly includes a pulse-type bag filter (3). The suction inlet of the dust suction unit faces the opening of the powder jet mixing pile hole. One end of the exhaust pipe (2) is connected to the outlet of the dust suction unit, and the other end of the exhaust pipe (2) is connected to the dust inlet (31) of the pulse-type bag filter (3).

2. The dust removal system device for powder jet mixing piles according to claim 1, characterized in that: The primary dust removal assembly includes a dust cover (1), which is installed on the drill rod (6) of the powder jet mixing pile drilling machine and is used to collect the air and dust flow that returns upward from the drill hole by the drill rod (6). The diameter of the opening of the dust cover (1) is larger than the diameter of the powder jet mixing pile. The top of the dust cover (1) is provided with an exhaust port (124), which is connected to the exhaust pipe (2). The exhaust pipe (2) is connected to the pulse bag dust collector (3).

3. The dust removal system device for powder jet mixing piles according to claim 2, characterized in that: The dust cover (1) has a sealing structure (11) between its opening and the drill rod (6) to prevent air and dust leakage, and the lower part of the dust cover (1) has a dust cover body unit (12).

4. The dust removal system device for powder jet mixing piles according to claim 3, characterized in that: The inner wall of the sealing structure (11) is tightly fitted onto the drill rod (6). The sealing structure (11) includes a cover plate (111), a sealing ring (112), and a mud scraper sleeve (113). The mud scraper sleeve (113) is located on the opening of the dust cover (1). The sealing ring (112) is located on the mud scraper sleeve (113). The cover plate (111) is fixed to the opening of the dust cover (1) by bolts and limits and fixes the sealing ring (112) and the mud scraper sleeve (113). The centers of the cover plate (111), the sealing ring (112), the mud scraper sleeve (113), and the opening of the dust cover (1) are all concentric.

5. The dust removal system device for powder jet mixing piles according to claim 4, characterized in that: The dust cover unit (12) includes two semi-cylindrical dust covers (121). The side walls of the dust cover (121) are provided with sealing gaskets (122). The two dust covers (121) are connected and fixed by the sealing gaskets (122) and bolts. The inner side of the sealing gaskets (122) is clamped with sealing rubber rings (123).

6. The dust removal system device for powder jet mixing piles according to claim 1, characterized in that: The primary dust removal component includes an induced draft fan device (5), which includes an induced draft fan (51) and a fixed frame (52). The induced draft fan (51) is detachably connected to the fixed frame (52), and the fixed frame (52) is installed on the guide support seat (4) at the front of the powder jet mixing pile drilling machine.

7. The dust removal system device for powder jet mixing piles according to claim 6, characterized in that: The induced draft fan (51) includes an air inlet (53) and an air outlet (54); the air inlet (53) faces the opening of the powder spraying mixing pile hole, and the air outlet (54) is connected to the dust inlet (31) of the pulse bag dust collector (3) through the exhaust pipe (2).

8. The dust removal system device for powder jet mixing piles according to claim 1, characterized in that: The pulse-jet bag filter (3) is installed on the pile driver of the powder jet mixing pile drilling machine. The pulse-jet bag filter (3) includes a dust inlet (31), an ash outlet (32) and a material collection unit (33). The material collection unit (33) is installed on the pile driver of the powder jet mixing pile drilling machine and is located directly below the ash outlet (32).

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