Fine particle removing equipment and method for hydraulic fill sand foundation

Abstract

The invention relates to the field of transportation engineering foundation construction, and particularly discloses fine particle removing equipment and method for a hydraulic reclamation sand foundation, and the fine particle removing equipment comprises a pipeline, an upper rod body, a suction pipe body and a conical head; a high-pressure water pipe, a high-pressure air pipe and a mud suction pipe which are respectively communicated with the pipeline are arranged in the upper rod body; the suction pipe body is sequentially provided with a shell, a filter screen and a sludge suction cavity from outside to inside, the shell is provided with a plurality of suction holes and a plurality of high-pressure air injection holes, the high-pressure air injection holes are communicated with a high-pressure air pipe, and the sludge suction cavity is communicated with a sludge suction pipe; a high-pressure water spraying hole communicated with the high-pressure water pipe is formed in the tip end of the conical head; and a plurality of vibration rods are fixedly arranged in the upper rod body and the suction pipe body. The fine particle removing equipment goes deep into a soil layer, removes fine particles in the soil layer through suction and filtration, is simple in structure, easy to implement, low in construction cost and convenient to operate, and can effectively remove the fine particles in a hydraulic reclamation sand foundation, so that the difficulty of hydraulic reclamation sand foundation treatment construction is greatly reduced.

Description

Technical Field

[0001] The invention relates to the field of water transport engineering foundation construction, and in particular to a fine particle removal device and method for blown fill sand foundation. Background Art

[0002] With the continuous development of modern infrastructure technology, the requirements and standardization of port construction have gradually increased. In the process of site selection and construction of ports with different address conditions, there is an increasing demand for port foundation construction by blowing sand backfill. Sand backfill construction generally requires that the fine particle content of the backfill should be less than 10% to 15% so that the bearing capacity and settlement requirements of the design can be achieved after foundation treatment.

[0003] However, in the actual process of backfilling and foundation treatment of port engineering yards, there is often a silt layer at the bottom of the filling area after the filling is completed. The main reason is that during the backfilling process, the filling sand is squeezed, which causes a lot of fine particles to accumulate in the local area to form silt, which makes the subsequent foundation treatment construction more difficult. In addition, in this case, the silt is often unevenly distributed and buried deep.

[0004] Another common situation is that because the blown filler is not pure sand, fine particles often accumulate and precipitate in areas far from the pipe head during the pipe blowing process, resulting in excessive fine particle content in the local blown fill layer, affecting the foundation treatment effect. The above problems often require the use of additional composite foundations to deal with the problem of excessive fine particles in high-standard overseas projects, which greatly increases project costs and takes a long time to deal with. Summary of the invention

[0005] In order to overcome the above problems, the present invention provides a fine particle removal device and method for a sand fill foundation.

[0006] The present invention provides a fine particle removal device for blown sand foundation, which is used to absorb fine particles in blown sand foundation under the action of a high-pressure water pump, a high-pressure air pump, a negative pressure pump and a vibration source, and is characterized in that it comprises: a pipeline, an upper rod body, a suction pipe body and a cone head which are fixedly connected in sequence from top to bottom;

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

[0008] The suction pipe body is provided with a shell, a filter screen and a mud suction cavity in sequence from the outside to the inside, the shell is provided with a plurality of suction holes and a plurality of high-pressure jet holes, the high-pressure jet holes are connected to the high-pressure air pipe, and the mud suction cavity is connected to the mud suction pipe;

[0009] The cone head is a cone with the tip facing downwards, and a high-pressure water spray hole connected to the high-pressure water pipe is provided at the tip of the cone head;

[0010] A plurality of vibration rods are fixedly disposed in the upper rod body and the suction tube body, and the vibration rods are connected to the vibration source through the pipeline.

[0011] Preferably, the filter screen comprises a primary filter element and a secondary filter element, a fine sand interlayer is provided between the primary filter element and the secondary filter element, the primary filter element is fixedly connected to the outer shell, and the secondary filter element is fixedly connected to the upper rod body.

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

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

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

[0015] Preferably, an armor layer is provided on the outside of the pipeline.

[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 via a wire in the pipeline.

[0017] The present invention also provides a fine particle removal device for a sandy soil foundation. The fine particle removal device for a sandy soil foundation is applied, and the steps are as follows:

[0018] Insert the fine particle removal device into the designated position in the blown sand foundation, spray high-pressure water through the high-pressure water spray hole, inject water into the blown sand foundation and flush the blown sand foundation below to form a hole, lower the fine particle removal device along the hole until it reaches the designated depth, and stop spraying the high-pressure water;

[0019] A high-pressure airflow is ejected through a plurality of the high-pressure air jet holes, the high-pressure airflow splits the soil layer of the blown sand foundation, and then the ejection of the high-pressure airflow is stopped;

[0020] The negative pressure pump is used to provide negative pressure to the mud suction pipe, so that the water in the blown sand foundation passes through the suction hole and the filter screen in turn and enters the mud suction chamber. The filter screen blocks the sand with larger fine particles from entering the mud suction chamber, while the fine particles with smaller fine particles are sucked away by the negative pressure pump along with the water flow.

[0021] Starting the vibrating rod to generate vibration, thereby preventing the filter screen from being blocked by sand;

[0022] When the fine particle removal at the designated location is completed, the fine particle removal device is withdrawn.

[0023] As preferably, the steps are also included as follows:

[0024] The high-pressure water flow and high-pressure air flow are sprayed intermittently respectively.

[0025] Preferably, when the fine particle removal at the designated position is completed, the fine particle removal device is withdrawn, which specifically includes the following sub-steps:

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

[0027] If so, the fine particle removal device is lifted up by one meter and the suction is continued until the fine particle removal device reaches the ground surface, thus completing the fine particle removal at the designated location;

[0028] Otherwise, continue with the suction.

[0029] The beneficial effects of the present invention are:

[0030] The fine particle removal equipment penetrates into the soil layer through vibration, high-pressure water and high-pressure gas, and removes the fine particles in the soil layer through suction and filtration. It has a simple structure, is easy to implement, has low construction cost and convenient operation. It can effectively remove fine particles in the blown sand foundation, greatly reducing the difficulty of subsequent blown sand foundation treatment construction. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0033] Figure 2 This is a flow chart of a 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 AA in the middle.

[0036] In the figure: 1. cone head; 101. sealing rubber pad; 102. first thread; 103. high-pressure water spray hole; 2. suction pipe body; 201. mud suction chamber; 202. primary filter element; 203. secondary filter element; 204. high-pressure jet hole; 205. suction hole; 206. fine sand interlayer; 3. upper rod body; 301. high-pressure water pipe; 302. high-pressure air pipe; 303. mud suction pipe; 4. lifting ring; 5. pipeline; 6. vibration rod. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1 and Figure 2 As a first embodiment of the present invention, a fine particle removal device for blown sand foundation is disclosed, which is used to absorb fine particles in blown sand foundation under the action of a high-pressure water pump, a high-pressure air pump, a negative pressure pump and a vibration source, and specifically comprises: a pipeline 5, an upper rod body 3, a suction pipe body 2 and a cone head 1 which are fixedly connected in sequence from top to bottom;

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

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

[0041] The cone head 1 is a cone with the tip facing downwards. A high-pressure water spray hole 103 connected to the high-pressure water pipe 301 is provided at the tip of the cone head 1, and the water outlet direction of the high-pressure water spray hole 103 is downwards.

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

[0043] This embodiment also discloses a fine particle removal method for a blown sand foundation, using the fine particle removal device, comprising the following steps:

[0044] S1. Site selection: According to the geological exploration results, several designated locations are set in the area where fine particles need to be removed;

[0045] S2, inserting: inserting the fine particle removal device into the designated position in the blown sand foundation, spraying high-pressure water through the high-pressure water spray hole 103, injecting water into the blown sand foundation and flushing the blown sand foundation below to form a hole, lowering the fine particle removal device along the hole until it reaches the designated depth (or 0.5m below its elevation), and stopping spraying the high-pressure water;

[0046] S3, splitting: spraying high-pressure airflow through a plurality of the high-pressure air jet holes 204, the high-pressure airflow splits the soil layer of the blown sand foundation, and then stops spraying the high-pressure airflow;

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

[0048] S5, vibration: start the vibration rod 6 to generate vibration, so as to prevent the filter screen from being blocked by sand;

[0049] S6. Recycling: When the fine particle removal at the designated location is completed, the fine particle removal equipment is withdrawn.

[0050] Step S5 can be executed simultaneously with step S4, or before or after it, that is, the vibration rod 6 can be turned on continuously to increase the pore water pressure and improve the ability of silt to pass through the filter group, or the vibration rod 6 can be turned on again before and after removing fine particles from each treated soil layer 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 make the fine particle removal equipment penetrate into the soil layer, and removes the fine particles in the soil layer through suction and filtration. It has a simple structure, is easy to implement, has a low construction cost, and is easy to operate. It can effectively remove fine particles in the blown sand foundation, greatly reducing the difficulty of subsequent blown sand foundation treatment construction.

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

[0053] If necessary, the filter element can be arranged in multiple layers to perform multi-stage filtration.

[0054] The upper end of the upper rod body 3 is fixed with a lifting ring 4, which is used to connect a cable or a suspension rod to suspend or nail the fine particle removal equipment into the blown sand foundation, so as to facilitate hanging and looking back and avoid excessive force 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 pad 101 is fixedly arranged between the cone head 1 and the suction tube body 2. The detachable connection design of the first thread 102 facilitates the cleaning and maintenance of the interior of the suction tube body 2, and timely removes the accumulated sand and soil. The sealing rubber pad 101 is used to enhance the sealing effect.

[0056] The fine particle removal device further comprises a pressure sensor, which is fixedly mounted on the outer surface of the cone head 1 and / or the upper rod body 3. The pressure in the soil layer can be obtained at any time, so as to better judge the working environment of the fine particle removal device and the changes in the surrounding soil layer.

[0057] An armor layer is arranged outside the pipeline 5, similar to an armored cable, to enhance the protection of the pipeline 5.

[0058] The vibration source of this embodiment is a power source, and the vibration rod 6 is an electric vibration rod 6, and 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 of this embodiment also includes the following steps:

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

[0061] This intermittently splits the soil layer and replenishes the moisture in the soil layer, improving the removal efficiency of fine particles. The high-pressure airflow can be injected intermittently or for a short period of time at the beginning to save energy and cost.

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

[0063] S61, obtaining the soil fine particle content at the designated location according to the turbidity degree of the water flow pumped out by the negative pressure pump;

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

[0065] S621, if yes, then the fine particle removal device is lifted up by one meter, and suction is continued until the fine particle removal device reaches the ground surface, thereby completing the fine particle removal at the designated location;

[0066] S622: Otherwise, continue to suction.

[0067] This allows for a more accurate determination of the progress of fine particle removal, and for timely replacement of points after removal is complete, thereby improving removal efficiency.

[0068] The fine particle content of the soil at the designated location can be used for comparison with the geological survey data. If the data is consistent, it means that the geological survey data is correct. If the data is inconsistent, it means that the geological survey data may be wrong, or the fine particle removal equipment has entered the wrong point, such as deviation or other conditions during the sinking process, which requires construction personnel to correct or calibrate on-site according to the specific situation.

[0069] In the drawings of the device embodiments provided by the present invention, the connection relationship between modules indicates that there is a communication connection between them, which can be specifically implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement it without creative work.

Claims

1. A fine particle removal device for blown sand foundation, used to absorb fine particles in blown sand foundation under the action of high-pressure water pump, high-pressure air pump, negative pressure pump and vibration source, characterized in that: include: The connected pipelines, upper rod body, suction pipe body and cone head are fixed in sequence from top to bottom; The upper rod body is provided with a high-pressure water pipe, a high-pressure air pipe and a mud suction pipe which are respectively connected to the pipeline, and 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 mud suction pipe is connected to the negative pressure pump through the pipeline; The suction pipe body is provided with a shell, a filter screen and a mud suction cavity in sequence from the outside to the inside, the shell is provided with a plurality of suction holes and a plurality of high-pressure jet holes, the high-pressure jet holes are connected to the high-pressure air pipe, and the mud suction cavity is connected to the mud suction pipe; The cone head is a cone with the tip facing downwards, and a high-pressure water spray hole connected to the high-pressure water pipe is provided at the tip of the cone head; A plurality of vibration rods are fixedly disposed in the upper rod body and the suction tube body, and the vibration rods are connected to the vibration source through the pipeline.

2. The fine particle removal device for sand fill foundation according to claim 1, characterized in that: The filter screen comprises a primary filter element and a secondary filter element, a fine sand interlayer is arranged between the primary filter element and the secondary filter element, the primary filter element is fixedly connected to the housing, and the secondary filter element is fixedly connected to the upper rod body.

3. The fine particle removal device for sand fill foundation according to claim 1, characterized in that: A lifting ring is fixedly provided on the upper end of the upper rod body.

4. The fine particle removal device for sand fill foundation according to claim 1, characterized in that: The cone head is fixedly connected to the suction tube body via a first thread, and a sealing rubber pad is fixedly arranged between the cone head and the suction tube body.

5. The fine particle removal device for sand fill foundation according to claim 1, characterized in that: The fine particle removal device further comprises a pressure sensor, which is fixedly arranged on the outer surface of the cone head and / or the upper rod body.

6. The fine particle removal device for sand fill foundation according to claim 1, characterized in that: An armor layer is arranged on the outside of the pipeline.

7. The fine particle removal device for sand fill foundation 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.

8. A method for removing fine particles from a sandy foundation, characterized in that: The use of the fine particle removal device for sand fill foundation as described in any one of claims 1 to 7 comprises the following steps: Insert the fine particle removal device into the designated position in the blown sand foundation, spray high-pressure water through the high-pressure water spray hole, inject water into the blown sand foundation and flush the blown sand foundation below to form a hole, lower the fine particle removal device along the hole until it reaches the designated depth, and stop spraying the high-pressure water; A high-pressure airflow is ejected through a plurality of the high-pressure air jet holes, the high-pressure airflow splits the soil layer of the blown sand foundation, and then the ejection of the high-pressure airflow is stopped; The negative pressure pump provides negative pressure to the mud suction pipe, so that the mud and water in the blown sand foundation pass through the suction hole and the filter screen in turn and enter the mud suction chamber. The filter screen blocks the sand with larger fine particles from entering, while the fine particles with smaller fine particles are sucked away by the negative pressure pump along with the water flow. Starting the vibrating rod to generate vibration, thereby preventing the filter screen from being blocked by sand; When the fine particle removal at the designated location is completed, the fine particle removal device is withdrawn.

9. A method for removing fine particles from a sandy foundation according to claim 8, characterized in that: The following steps are also included: The high-pressure water flow and high-pressure air flow are sprayed intermittently respectively.

10. A method for removing fine particles from a sandy foundation according to claim 9, characterized in that: When the fine particles at the designated location are removed, the fine particles removal device is withdrawn, which specifically includes the following steps: According to whether the turbidity of the water flow pumped out by the negative pressure pump is less than a first preset value; If so, the fine particle removal device is lifted up by one meter and the suction is continued until the fine particle removal device reaches the ground surface, thus completing the fine particle removal at the designated location; Otherwise, continue with the suction.

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