A method for removing fine particles from a sand fill foundation

Abstract

This invention relates to the field of engineering foundation construction, specifically disclosing a method for removing fine particles from dredged sandy soil foundations. The method includes a pipeline, an upper rod, a suction pipe, and a cone. The upper rod contains a high-pressure water pipe, a high-pressure air pipe, and a suction pipe, all connected to the pipeline. The suction pipe, from the outside in, consists of an outer shell, a filter screen, and a suction chamber. The outer shell has several suction holes and several high-pressure air jet holes, connected to the high-pressure air pipe, and the suction chamber is connected to the suction pipe. The cone's tip has a high-pressure water jet hole connected to the high-pressure water pipe. Several vibrating rods are fixedly installed within the upper rod and suction pipe. This invention's fine particle removal equipment penetrates deep into the soil layer and removes fine particles through suction and filtration. It has a simple structure, is easy to implement, has low construction costs, and is convenient to operate. It can effectively remove fine particles from dredged sandy soil foundations, greatly reducing the difficulty of dredged sandy soil foundation treatment construction.

Description

Technical Field

[0001] This invention relates to the field of foundation construction for waterway engineering, and more particularly to a method for removing fine particles from dredged sandy soil foundations. Background Technology

[0002] With the continuous development of modern infrastructure technology, the requirements and standardization of port construction are gradually increasing. In the process of port site selection and construction under different geological conditions, there is an increasing demand for using dredged sand and soil for port foundation construction. Sand and soil backfilling construction generally requires the fine particle content of the backfill to be less than 10% to 15% in order to ensure that the bearing capacity and settlement requirements are met after foundation treatment.

[0003] However, in the actual process of backfilling and foundation treatment of port engineering yards, a silt layer often appears at the bottom of the backfill area after the dredged filling is completed. The main reason for this is that during the backfilling process, the dredged sand and soil are compressed, causing local areas to easily accumulate more fine particles and form silt, which makes subsequent foundation treatment construction very difficult. Moreover, in this case, the silt is often unevenly distributed and buried at a deep depth.

[0004] Another common issue arises because the bleaching filler is not pure sand. During pipe blowing, fine particles often accumulate and settle in areas far from the pipe head, leading to excessive fine particle content in the localized bleaching fill layer and affecting the foundation treatment effect. These problems necessitate the use of composite foundations in high-standard overseas projects to address the localized fine particle content, significantly increasing project costs and time-consuming the process. Summary of the Invention

[0005] To overcome the above problems, the present invention provides a method for removing fine particles from dredged sandy soil foundations.

[0006] This invention provides a fine particle removal device for dredged sandy soil foundations, which is used to extract fine particles from dredged sandy soil foundations under the action of a high-pressure water pump, a high-pressure air pump, a negative pressure pump and a vibration source. The device is characterized by comprising: a pipeline, an upper rod, a suction pipe and a cone head, which are fixedly connected from top to bottom.

[0007] The upper rod body is provided with a high-pressure water pipe, a high-pressure air pipe and a sludge suction pipe respectively connected to the pipeline. The high-pressure water pipe is connected to the high-pressure water pump through the pipeline, the high-pressure air pipe is connected to the high-pressure air pump through the pipeline, and the sludge suction pipe is connected to the negative pressure pump through the pipeline.

[0008] The suction tube body is provided with an outer shell, a filter screen and a sludge suction chamber from the outside to the inside. The outer shell is provided with a number of suction holes and a number of high-pressure air jet holes. The high-pressure air jet holes are connected to the high-pressure air pipe, and the sludge suction chamber is connected to the sludge suction tube.

[0009] The cone is a cone with its tip pointing downwards, and the tip of the cone is provided with a high-pressure water jet hole that is connected to the high-pressure water pipe.

[0010] Several vibrating rods are fixedly installed inside the upper rod body and the suction tube, and the vibrating rods are connected to the vibration source through the pipeline.

[0011] Preferably, the filter screen includes a primary filter element and a secondary filter element, with a fine sand interlayer between the primary and secondary filter elements. The primary filter element is fixedly connected to the outer shell, and the secondary filter element is fixedly connected to the upper rod.

[0012] Preferably, a lifting ring is fixedly provided at the upper end of the upper rod.

[0013] Preferably, the cone head is fixedly connected to the suction tube body by a first thread, and a sealing rubber gasket is fixedly provided between the cone head and the suction tube body.

[0014] Preferably, the fine particle removal device further includes a pressure sensor, which is fixedly disposed on the outer surface of the cone head and / or the upper rod.

[0015] Preferably, the pipeline is provided with an armor layer on its outer side.

[0016] Preferably, the vibration source is a power source, the vibration rod is an electric vibration rod, and the vibration rod is connected to the power source through a wire in the pipeline.

[0017] The present invention also provides a fine particle removal device for dredged sandy soil foundations. The application of the above-mentioned fine particle removal device for dredged sandy soil foundations includes the following steps:

[0018] Insert the fine particle removal device into the designated position in the dredged sand foundation, spray high-pressure water through the high-pressure water jet hole to inject water into the dredged sand foundation and flush out the dredged sand foundation below to form holes, lower the fine particle removal device along the holes until the designated depth is reached, and stop spraying high-pressure water;

[0019] High-pressure airflow is ejected through several high-pressure jet holes, which splits the soil layers of the dredged sand foundation, and then the ejection of high-pressure airflow stops.

[0020] The negative pressure pump provides negative pressure to the suction pipe, so that the water in the dredged sand foundation passes through the suction hole and the filter screen in sequence and enters the suction chamber. The filter screen blocks the larger fine sand particles, while the smaller fine particles are sucked away by the negative pressure pump along with the water flow.

[0021] The vibrating rod is activated to generate vibration, thereby preventing the filter screen from being clogged by sand and soil;

[0022] Once the fine particle removal at the designated location is complete, withdraw the fine particle removal device.

[0023] Preferably, the steps also include the following:

[0024] It intermittently sprays high-pressure water jets and high-pressure air jets, respectively.

[0025] Preferably, when the fine particle removal at the designated location is completed, the fine particle removal device is withdrawn, specifically including the following steps:

[0026] Based on whether the turbidity of the water pumped out by the negative pressure pump is less than a first preset value;

[0027] If so, after raising the fine particle removal device by one meter, continue suction until the fine particle removal device reaches the ground surface, and end the fine particle removal at that designated location.

[0028] Otherwise, continue suctioning.

[0029] The beneficial effects of this invention are:

[0030] The fine particle removal equipment penetrates deep into the soil layer through vibration, high-pressure water, and high-pressure gas. It removes fine particles from the soil layer through suction and filtration. The structure is simple, easy to implement, has low construction cost, and is convenient to operate. It can effectively remove fine particles from the dredged sand foundation, greatly reducing the difficulty of subsequent dredged sand foundation treatment construction. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings, wherein:

[0032] Figure 1 This is a cross-sectional view of Embodiment 1 of the present invention;

[0033] Figure 2 This is a flowchart of the method according to Embodiment 1 of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0035] Figure 4 for Figure 2 Cross-sectional view at point AA.

[0036] In the diagram: 1. Cone head; 101. Sealing rubber gasket; 102. First thread; 103. High-pressure water jet hole; 2. Suction pipe body; 201. Sludge suction chamber; 202. Primary filter element; 203. Secondary filter element; 204. High-pressure air jet hole; 205. Suction hole; 206. Fine sand interlayer; 3. Upper rod body; 301. High-pressure water pipe; 302. High-pressure air pipe; 303. Sludge suction pipe; 4. Lifting ring; 5. Pipeline; 6. Vibrating rod. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] See Figure 1 and Figure 2 As an embodiment of the present invention, a fine particle removal device for dredged sandy soil foundation is disclosed, which is used to extract fine particles in dredged sandy soil foundation under the action of high pressure water pump, high pressure air pump, negative pressure pump and vibration source, specifically including: pipeline 5, upper rod 3, suction pipe 2 and cone head 1 fixedly connected from top to bottom;

[0039] The upper rod 3 is provided with a high-pressure water pipe 301, a high-pressure air pipe 302, and a sludge suction pipe 303, which are respectively connected to the pipeline 5. The high-pressure water pipe 301 is connected to the high-pressure water pump through the pipeline 5, the high-pressure air pipe 302 is connected to the high-pressure air pump through the pipeline 5, and the sludge suction pipe 303 is connected to the negative pressure pump through the pipeline 5.

[0040] The suction tube body 2 is provided with an outer shell, a filter screen and a sludge suction chamber 201 from the outside to the inside. The outer shell is provided with a number of suction holes 205 and a number of high-pressure air jet holes 204. The high-pressure air jet holes 204 are connected to the high-pressure air pipe 302, and the sludge suction chamber 201 is connected to the sludge suction tube 303.

[0041] The cone 1 is a cone with its tip pointing downwards. The tip of the cone 1 is provided with a high-pressure water jet hole 103 that is connected to the high-pressure water pipe 301, and the water outlet direction of the high-pressure water jet hole 103 is downwards.

[0042] A plurality of vibrating rods 6 are fixedly installed inside the upper rod body 3 and the suction tube body 2, and the vibrating rods 6 are connected to the vibration source through the pipeline 5.

[0043] This embodiment also discloses a method for removing fine particles from dredged sandy soil foundations, using the aforementioned fine particle removal equipment, and including the following steps:

[0044] S1. Site Selection: Based on the geological exploration results, set several designated locations in the area where fine-grained removal is required;

[0045] S2. Insertion: Insert the fine particle removal device into the designated position in the dredged sand foundation, spray high-pressure water through the high-pressure water jet hole 103 to inject water into the dredged sand foundation and flush open the dredged sand foundation below to form a hole, and lower the fine particle removal device along the hole until it reaches the designated depth (or 0.5m below its elevation), and stop spraying high-pressure water.

[0046] S3, splitting: High-pressure airflow is ejected through several high-pressure jet holes 204, and the high-pressure airflow splits the soil layer of the dredged sand foundation, after which the ejection of high-pressure airflow stops;

[0047] S4. Suction: The negative pressure pump provides negative pressure to the suction pipe 303, so that the water in the blown sand foundation passes through the suction hole 205 and the filter screen in sequence and enters the suction chamber 201. The filter screen blocks the larger fine sand particles, while the smaller fine particles are sucked away by the negative pressure pump along with the water flow.

[0048] S5. Vibration: The vibrating rod 6 is activated to generate vibration, thereby preventing the filter screen from being clogged by sand and soil;

[0049] S6. Recycling: When the fine particles at the designated location have been removed, the fine particle removal equipment is withdrawn.

[0050] Step S5 can be performed simultaneously with step S4, or before or after it. That is, the vibrating rod 6 can be continuously turned on to increase the pore water pressure and improve the ability of sludge to pass through the filter group, or the vibrating rod 6 can be turned on before and after each treated soil layer to remove fine particles to remove fine particles attached to the filter group and save energy.

[0051] This embodiment uses vibration, high-pressure water, and high-pressure gas to drive the fine particle removal equipment deep into the soil layer. Through suction and filtration, it removes fine particles from the soil layer. The structure is simple, easy to implement, has low construction cost, and is convenient to operate. It can effectively remove fine particles from the dredged sand foundation, greatly reducing the difficulty of subsequent dredged sand foundation treatment construction.

[0052] See Figure 3 and Figure 4 As a second embodiment of the present invention, the difference between this embodiment and the first embodiment is that the filter screen in this embodiment includes a primary filter element 202 and a secondary filter element 203. A fine sand interlayer 206 is provided between the primary filter element 202 and the secondary filter element 203. The primary filter element 202 is fixedly connected to the outer shell and is located between the fine sand interlayer 206 and the suction hole 205. The secondary filter element 203 is fixedly connected to the upper rod 3 and separates the fine sand interlayer 206 from the mud suction chamber 201.

[0053] If necessary, the filter element can be configured with multiple layers for multi-stage filtration.

[0054] The upper end of the upper rod 3 is fixed with a lifting ring 4. The lifting ring 4 is used to connect cables or rods to suspend or nail the fine particle removal equipment into the dredged sand foundation, which facilitates suspension and retraction and avoids excessive stress on the pipeline 5.

[0055] The cone head 1 is fixedly connected to the suction tube body 2 via a first thread 102, and a sealing rubber gasket 101 is fixedly provided between the cone head 1 and the suction tube body 2. The detachable connection design of the first thread 102 facilitates cleaning and maintenance of the inside of the suction tube body 2, allowing for timely removal of accumulated sand and soil. The sealing rubber gasket 101 enhances the sealing effect.

[0056] The fine particle removal device also includes a pressure sensor, which is fixedly mounted on the outer surface of the cone head 1 and / or the upper rod 3. This allows for real-time monitoring of the soil pressure, providing a better understanding of the working environment of the fine particle removal device and changes in the surrounding soil.

[0057] The outer side of the pipeline 5 is equipped with an armor layer, similar to an armored cable, to reinforce and protect the pipeline 5.

[0058] In this embodiment, the vibration source is a power source, and the vibration rod 6 is an electric vibration rod 6. The vibration rod 6 is connected to the power source through a wire in the pipeline 5. The wire is preferably an armored cable.

[0059] The fine particle removal method in this embodiment further includes the following steps:

[0060] S41. During the suction process in step S4, high-pressure water jets and high-pressure air jets are intermittently sprayed.

[0061] This intermittently fractures the soil layer and replenishes the moisture within it, improving the efficiency of fine particle removal. The high-pressure airflow can be injected intermittently, or initially for a short period, to save energy and costs.

[0062] Step S6, recycling, in this embodiment specifically includes the following sub-steps:

[0063] S61. Based on the turbidity of the water flow pumped out by the negative pressure pump, obtain the soil fine particle content at the specified location;

[0064] S62. Determine whether the turbidity of the water pumped out by the negative pressure pump is less than a first preset value;

[0065] S621. If so, after raising the fine particle removal device by one meter, continue suction until the fine particle removal device reaches the ground surface, and end the fine particle removal at the designated location.

[0066] S622. Otherwise, continue suctioning.

[0067] This allows for more accurate judgment of the fine particle removal progress, enabling timely replacement of the removal site after removal is completed, thus improving removal efficiency.

[0068] Obtaining the soil fine particle content at the specified location can be used to compare with geological survey data. If the data matches, it means that the geological survey data is correct. If the data does not match, it means that the geological survey data may be incorrect, or the fine particle removal equipment has entered the wrong location, such as due to deviation or other issues during the sinking process. Construction personnel need to correct or adjust the data on-site according to the specific situation.

[0069] In the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can be specifically implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any inventive effort.

Claims

1. A method for removing fine particles from dredged sandy soil foundations, characterized in that, The equipment includes a fine particle removal device for removing fine particles from a dredged sandy soil foundation under the action of a high-pressure water pump, a high-pressure air pump, a negative pressure pump and a vibration source. The fine particle removal device includes a pipeline, an upper rod, a suction pipe and a cone head that are fixedly connected from top to bottom. The upper rod body is provided with a high-pressure water pipe, a high-pressure air pipe and a sludge suction pipe respectively connected to the pipeline. The high-pressure water pipe is connected to the high-pressure water pump through the pipeline, the high-pressure air pipe is connected to the high-pressure air pump through the pipeline, and the sludge suction pipe is connected to the negative pressure pump through the pipeline. The suction tube body is provided with an outer shell, a filter screen and a sludge suction chamber from the outside to the inside. The outer shell is provided with a number of suction holes and a number of high-pressure air jet holes. The high-pressure air jet holes are connected to the high-pressure air pipe, and the sludge suction chamber is connected to the sludge suction tube. The cone is a cone with its tip pointing downwards, and the tip of the cone is provided with a high-pressure water jet hole that is connected to the high-pressure water pipe. Several vibrating rods are fixedly installed inside the upper rod body and the suction tube body, and the vibrating rods are connected to the vibration source through the pipeline; The filter screen includes a primary filter element and a secondary filter element, with a fine sand interlayer between the primary and secondary filter elements. The primary filter element is fixedly connected to the outer shell, and the secondary filter element is fixedly connected to the upper rod. The primary filter element is located between the fine sand interlayer and the suction hole, and the secondary filter element separates the fine sand interlayer from the mud suction chamber. The fine particle removal method includes the following steps: Insert the fine particle removal device into the designated position in the dredged sand foundation, spray high-pressure water through the high-pressure water jet hole to inject water into the dredged sand foundation and flush out the dredged sand foundation below to form holes, lower the fine particle removal device along the holes until the designated depth is reached, and stop spraying high-pressure water; High-pressure airflow is ejected through several high-pressure jet holes, which splits the soil layers of the dredged sand foundation, and then the ejection of high-pressure airflow stops. The negative pressure pump provides negative pressure to the suction pipe, so that the mud and water in the dredged sand foundation pass through the suction hole and the filter screen in sequence and enter the suction chamber. The filter screen blocks the sand particles with a diameter larger than the filter screen aperture, while the fine particles with a diameter smaller than the filter screen aperture are sucked away by the negative pressure pump along with the water flow. The vibrating rod is activated to generate vibration, thereby preventing the filter screen from being clogged by sand and soil; Once the fine particle removal at the designated location is complete, withdraw the fine particle removal device.

2. The method for removing fine particles from dredged sandy soil foundations according to claim 1, characterized in that, The steps also include the following: It intermittently sprays high-pressure water jets and high-pressure air jets, respectively.

3. A method for removing fine particles from dredged sandy soil foundations according to claim 2, characterized in that, Once the fine particle removal at the designated location is complete, the fine particle removal equipment is withdrawn. The specific steps are as follows: Based on whether the turbidity of the water pumped out by the negative pressure pump is less than a first preset value; If so, after raising the fine particle removal device by one meter, continue suction until the fine particle removal device reaches the ground surface, and end the fine particle removal at that designated location. Otherwise, continue suctioning.

4. A method for removing fine particles from dredged sandy soil foundations according to claim 1, characterized in that, A lifting ring is fixedly provided at the upper end of the upper rod.

5. A method for removing fine particles from dredged sandy soil foundations according to claim 1, characterized in that, The cone head is fixedly connected to the suction tube body by a first thread, and a sealing rubber gasket is fixed between the cone head and the suction tube body.

6. A method for removing fine particles from dredged sandy soil foundations according to claim 1, characterized in that, The fine particle removal device also includes a pressure sensor, which is fixedly mounted on the outer surface of the cone head and / or the upper rod.

7. A method for removing fine particles from dredged sandy soil foundations according to claim 1, characterized in that, The pipeline is armored on the outside.

8. A method for removing fine particles from dredged sandy soil foundations according to claim 1, characterized in that, The vibration source is a power source, the vibration rod is an electric vibration rod, and the vibration rod is connected to the power source through a wire in the pipeline.

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