A water-gas separation tank for soft soil subgrade vacuum preloading construction

Abstract

This invention relates to the field of vacuum preloading construction technology for soft soil subgrades, and proposes a water-air separation tank for vacuum preloading construction of soft soil subgrades. The tank includes a tank body and a placement platform. A support frame is fixedly installed on the tank body, and a pump body is fixedly installed on the support frame. A suction pipe is installed at one end of the pump body, and an outlet pipe connected to the tank body is installed at the other end. A limit pipe is slidably installed on the outlet pipe, and a spray pipe is installed at one end of the limit pipe. This invention is started by a motor, which drives a gear to rotate via a crossbar, thereby driving the separation tank to rotate at a low and uniform speed. The mixed medium is sprayed onto the inner wall of the rotating separation tank. Under the action of centrifugal force, larger impurities (such as plant roots and large stones) are trapped inside the separation tank, avoiding the situation where large particles and plant residues in the soft soil easily deposit at the bottom of the tank, affecting the construction progress.

Description

Technical Field

[0001] This invention relates to the field of vacuum preloading construction technology for soft soil subgrades, specifically a water-air separation tank for vacuum preloading construction of soft soil subgrades. Background Technology

[0002] With the rapid development of my country's transportation infrastructure, highways, railways, and airport runways traverse a large number of coastal mudflats, inland lakes and marshes, and river valley plains. These areas are characterized by high natural water content, large void ratio, high compressibility, poor permeability, and low shear strength. Soft soils undergo significant settlement under load, exhibiting rapid settlement rates and long durations of secondary consolidation deformation. Taking typical silty clay in coastal areas as an example, its natural water content often approaches or exceeds the liquid limit, and the cohesion between soil particles is weak, making it prone to rheological deformation under external loads. If embankments are directly constructed without effective treatment, problems such as roadbed instability, excessive post-construction settlement, and significant differential settlement may occur after traffic begins, seriously threatening traffic safety and road service life. Therefore, in current domestic highway construction, vacuum preloading technology for soft soil subgrades has become one of the mainstream methods for treating soft soil foundations due to its high efficiency, environmental friendliness, and economy. To address the stability and settlement issues of soft soil subgrades, various foundation treatment methods have been developed in engineering, with drainage consolidation being the primary approach. This method accelerates the drainage consolidation of soft soil by setting up vertical drainage channels (such as sand wells and plastic drainage boards) and combining them with preloading (surcharge preloading and vacuum preloading). It is currently one of the most widely used and most economical methods.

[0003] Currently, rotary vane vacuum pumps and screw vacuum pumps are gradually being used in engineering projects. Although their energy efficiency has improved, they still face the challenge of handling water-air mixed media: the media extracted from soft soil contains a large amount of water and fine soil particles. Directly entering the vacuum pump can cause pump chamber wear, seal failure, or even pump jamming and shutdown. Therefore, water-air separation devices have become the core supporting equipment for vacuum preloading systems. In the current water-air separation tank, the extracted water also enters the pipeline along with the soft soil. Smaller particles and impurities in the soft soil are discharged from the tank along with the water outlet pipe. Larger particles, plant debris, and other impurities tend to accumulate at the bottom of the tank, requiring frequent manual dredging (on average once every 3 days), which affects the construction progress. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a water-air separation tank for vacuum preloading construction of soft soil subgrades, which solves the problem that impurities such as larger particles and plant residues in soft soil tend to deposit at the bottom of the tank, affecting the construction progress.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A water-air separation tank for vacuum preloading construction of soft soil subgrade includes a tank body and a placement platform. A support frame is fixedly installed on the tank body, and a No. 1 pump body is fixedly installed on the support frame. A liquid extraction pipe is installed at one end of the No. 1 pump body, and a liquid outlet pipe connected to the tank body is installed at the other end of the No. 1 pump body. A limit pipe is slidably installed on the liquid outlet pipe, and a spray pipe is installed at one end of the limit pipe. A hydraulic rod is fixedly installed on the tank body, and a fixing frame that is fixedly connected to the limiting tube is fixedly installed on the movable end of the hydraulic rod. The fixed frame is equipped with a separation mechanism for separating larger impurities in the liquid, and the tank is equipped with a cleaning mechanism to prevent larger impurities from accumulating inside the tank. The fixed frame is moved downward by a hydraulic rod so that larger impurities in the separation mechanism enter the cleaning mechanism.

[0006] Preferably, the separation mechanism includes a bearing fixedly mounted on a fixed frame, a separation box fixedly connected to the bearing is rotatably mounted on the fixed frame, and a plurality of separation holes are evenly provided on the separation box.

[0007] Preferably, the separation mechanism further includes an external toothed ring fixedly installed on the separation box, the separation box having a conical opening, an L-shaped bracket fixedly installed on the tank body, and a conical plug rotatably installed on the L-shaped bracket to cooperate with the conical opening.

[0008] Preferably, the separation mechanism further includes a motor fixedly mounted on the tank body, the output end of the motor being fixedly mounted with a cross rod rotatably connected to an L-shaped bracket, and a gear rotatably mounted on the fixed bracket engaging with an external gear ring and slidably connected to the cross rod.

[0009] Preferably, the cleaning mechanism includes a cylindrical block fixedly mounted on a conical plug, four sets of connecting rods evenly mounted on the cylindrical block, and annular scrapers that contact the inner wall of the separation chamber mounted on the connecting rods.

[0010] Preferably, the cleaning mechanism further includes an inclined groove formed on the annular scraper, the annular scraper is equipped with cleaning cotton that contacts the inner wall of the separation box, the separation box is provided with a conical groove, and the tank body is provided with a limiting groove.

[0011] Preferably, the cleaning mechanism further includes a collection box that is slidably mounted on a limiting groove, the collection box having multiple sets of filter holes evenly distributed on it, and a handle installed on the collection box.

[0012] Preferably, a second pump body is fixedly installed on the placement platform, and two sets of water outlet pipes are installed on the second pump body, one of which is connected to the tank.

[0013] Preferably, the tank body is equipped with an exhaust pipe that communicates with its interior, and the exhaust pipe is equipped with a solenoid valve.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, through the setting of the separation mechanism, is started by a motor, which drives the gear to rotate through the cross rod, thereby driving the separation box to rotate at a low and uniform speed. The mixed medium is sprayed onto the inner wall of the rotating separation box. Under the action of centrifugal force, larger impurities (such as plant roots and stems, large stones) are trapped inside the separation box, avoiding the situation where large particles, plant residues and other impurities in soft soil are easily deposited at the bottom of the tank, affecting the construction progress.

[0015] 2. The present invention, through the setting of the cleaning mechanism, uses a hydraulic rod to extend and push the separation box to move vertically downward. The annular scraper continuously scrapes away the sludge and impurities adhering to the inner wall. The jet sprayed from the nozzle splashes outward along the cylindrical block, evenly washing the inner wall of the separation box. The deposited impurities in the separation box fall into the collection box below through the open conical opening under the action of gravity, preventing the separation box from being blocked. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention from a first-view perspective; Figure 2 This is a schematic diagram of the overall structure of the present invention from a second perspective; Figure 3 This is a schematic diagram of the overall internal structure of the tank body of the present invention; Figure 4 This is a schematic diagram of the internal side structure of the tank body of the present invention; Figure 5 This is a schematic diagram showing the positional relationship between the separation box and the annular scraper of the present invention; Figure 6 This is a schematic diagram of the overall internal structure of the separation box of the present invention; Figure 7 This is a schematic diagram showing the positional relationship between the L-shaped bracket and the cylindrical block of the present invention; Figure 8 This is a schematic diagram showing the positional relationship between the L-shaped bracket and the conical plug of the present invention.

[0017] In the diagram: 1. Tank body; 101. Support frame; 102. Pump No. 1 body; 103. Suction pipe; 104. Discharge pipe; 105. Limiting pipe; 106. Spray pipe; 2. Hydraulic rod; 201. Fixing frame; 3. Separation mechanism; 301. Bearing; 302. Separation box; 303. Separation hole; 304. External toothed ring; 305. Conical opening; 306. L-shaped bracket; 307. Conical plug; 308. Electric... 309. Crossbar; 310. Gear; 4. Cleaning mechanism; 401. Cylindrical block; 402. Connecting rod; 403. Annular scraper; 404. Inclined groove; 405. Cleaning cotton; 406. Conical groove; 407. Limiting groove; 408. Collection box; 409. Filter hole; 410. Handle; 5. Placement platform; 501. Pump body No. 2; 502. Water outlet pipe; 6. Air outlet pipe; 601. Solenoid valve. Detailed Implementation

[0018] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0019] Example 1 Because larger particles, plant debris, and other impurities in soft soil tend to accumulate at the bottom of the tank, affecting construction progress, this problem is addressed by referring to... Figures 1-8 This embodiment proposes a water-air separation tank for vacuum preloading construction of soft soil subgrade, including a tank body 1 and a placement platform 5. A support frame 101 is fixedly installed on the tank body 1, and a first pump body 102 is fixedly installed on the support frame 101. A liquid extraction pipe 103 is installed at one end of the first pump body 102, and a liquid outlet pipe 104 connected to the tank body 1 is installed at the other end of the first pump body 102. During the vacuum preloading construction of the soft soil subgrade, the liquid extraction pipe 103 is connected to the vacuum extraction pipe under the sealing membrane. The liquid outlet pipe 104 can transport the liquid mixed with air into the tank body 1. A limit pipe 105 is slidably installed on the liquid outlet pipe 104. A nozzle 106 is installed at one end of the limit pipe 105. The liquid mixed with air enters the limit pipe 105 through the liquid outlet pipe 104. The water is sprayed out through the nozzle 106. A hydraulic rod 2 is fixedly installed on the tank body 1. A fixed bracket 201, which is fixedly connected to the limit tube 105, is fixedly installed on the movable end of the hydraulic rod 2. The height of the fixed bracket 201 can be controlled by the hydraulic rod 2. A second pump body 501 is fixedly installed on the placement platform 5. Two sets of water outlet pipes 502 are installed on the second pump body 501. One set of water outlet pipes 502 is connected to the tank body 1. Under the action of the water outlet pipe 502, the second pump body 501 can be started to draw out the water without large particles in the tank body 1. Finally, the water is discharged onto the sealing membrane through the water outlet pipe 502. An air outlet pipe 6, which is connected to the inside of the tank body 1, is installed on the tank body 1 to discharge the air in the tank body 1. A solenoid valve 601 is installed on the air outlet pipe 6 to control the closing of the air outlet pipe 6.

[0020] The fixed frame 201 is equipped with a separation mechanism 3 for separating larger impurities in the liquid, and the tank 1 is equipped with a cleaning mechanism 4 to prevent larger impurities from accumulating inside the tank 1. The fixed frame 201 is moved downward by the hydraulic rod 2 so that the larger impurities in the separation mechanism 3 enter the cleaning mechanism 4, which can prevent the separation box 302 from being blocked.

[0021] The separation mechanism 3 includes a bearing 301 fixedly mounted on a fixed frame 201. A separation box 302, fixedly connected to the bearing 301, is rotatably mounted on the fixed frame 201. The bearing 301 makes the rotation of the separation box 302 more stable. Multiple sets of separation holes 303 are evenly opened on the separation box 302 to discharge water containing fine particles. The separation mechanism 3 also includes an external toothed ring 304 fixedly mounted on the separation box 302. A conical opening 305 is opened on the separation box 302 to prevent large particles from affecting the seal of the conical opening 305. An L-shaped bracket 306 is fixedly mounted on the tank body 1. A conical plug 307, which cooperates with the conical opening 305, is rotatably mounted on the L-shaped bracket 306 to block the conical opening 305. The separation mechanism 3 also includes a motor 308 fixedly mounted on the tank body 1. The output end of the motor 308 is fixedly connected to the L-shaped bracket 306. The crossbar 309 is connected to the L-shaped bracket 306, which makes the rotation of the crossbar 309 more stable. The gear 310, which meshes with the external gear ring 304 and is slidably connected to the crossbar 309, is rotatably mounted on the fixed frame 201. The rotation of the crossbar 309 drives the gear 310 to rotate, and the gear 310 is not affected when sliding on the crossbar 309. The motor 308 is started to make the crossbar 309 rotate, and the rotation of the crossbar 309 drives the gear 310 to rotate. Under the action of the bearing 301, the rotation of the gear 310 drives the separation box 302 connected to the external gear ring 304 to rotate on the fixed frame 201. The fixed frame 201 rotates at a uniform speed and at a slow speed. The liquid sprayed through the nozzle 106 enters the rotating separation box 302. Smaller impurity particles and water can be quickly discharged through the separation hole 303 under the action of centrifugal force, avoiding the situation where larger particles, plant residues and other impurities in soft soil are easily deposited at the bottom of the tank, which affects the construction progress. Example 2 Because the separation holes on the separator are often clogged, the flow rate of the separated water gradually decreases. To solve this problem, refer to... Figures 1-8The cleaning mechanism 4 includes a cylindrical block 401 fixedly installed on a conical plug 307. The top of the cylindrical block 401 is also conical. When the cylindrical block 401 is close to the nozzle 106, the water sprayed from the nozzle 106 falls onto the cylindrical block 401 and splashes evenly onto the inner wall of the separator, facilitating the cleaning of the inner wall of the separator. Four sets of connecting rods 402 are evenly installed on the cylindrical block 401. An annular scraper 403 that contacts the inner wall of the separator 302 is installed on the connecting rods 402. The cleaning mechanism 4 also includes a sloping groove 404 formed on the annular scraper 403. When the separator 302 moves downward, the annular scraper 403, under the action of the sloping groove 404, facilitates the scraping of impurities on the inner wall of the separator 302 and their fall to the bottom of the separator 302. The annular scraper 403 is equipped with cleaning cotton 405 that contacts the inner wall of the separation box 302. Four sets of connecting rods 402 support the annular scraper 403, facilitating cleaning of the inner wall of the separation box 302 by the scraper 403 and cleaning cotton 405. This prevents larger impurities from clogging the separation holes 303 during vacuum preloading construction on soft soil subgrades, thus reducing the flow rate of separated water. The separation box 302 has a conical groove 406 to prevent liquids and particles from accumulating on it. The tank 1 has a limiting groove 407. The cleaning mechanism 4 also includes a collection box 408 slidably mounted on the limiting groove 407. The collection box 408 can be locked inside the tank 1 to maintain a sealed interior. The collection box 408 is used to collect larger impurities filtered out inside the separation box 302. Multiple sets of filter holes 409 are evenly distributed on the collection box 408. The diameter of the filter holes 409 is smaller than the diameter of the separation holes 303. These holes are mainly used to filter out the water inside the collection box 408. A handle 410 is installed on the collection box 408. When a large amount of large particles of impurities have settled inside the separation box 302 and need to be cleaned, the electric telescopic rod is activated to move the fixing frame 201 downwards. The downward movement of the fixing frame 201 moves the rotating separation box 302 downwards, causing the conical plug 307 to separate from the conical opening 305. The conical opening 305 is then opened, and under the action of the inclined groove 404, the annular scraper 403 can scrape off the larger particles of impurities adhering to the inner wall of the separation box 302. The scraped-off large particles of impurities can accumulate in the... Impurities at the bottom of the separator 302 will fall into the collection box 408 through the conical opening 305 under the action of the conical groove 406. As the separator 302 moves downward, it drives the limiting tube 105 and the spray pipe 106 downward, and the distance between the spray pipe 106 and the cylindrical block 401 will decrease. The water sprayed from the spray pipe 106 will fall onto the cylindrical block 401 and be evenly sprayed onto the inner wall of the separator 302, which can clean the inner wall of the separator 302. When the equipment is working, larger particles of impurities sprayed from the spray pipe 106 will automatically fall into the collection box 408. When cleaning the equipment, the liquid extraction pipe 103 is connected to the tap water pipe, and the water sprayed from the spray pipe 106 can clean the inner wall of the separator 302. Activating the electric telescopic rod will drive the fixing frame 201 to reset.The conical plug 307 blocks the conical opening 305, and this process is repeated to facilitate the removal of larger particles of impurities deposited inside the separator 302. After unlocking the collection box 408, it is pulled out of the tank 1 for easy cleaning without affecting the flow rate of the water separated in the separator.

[0022] Working principle: Before system startup, the equipment is in standby mode, hydraulic rod 2 is in retracted state, fixed frame 201 and separation box 302 installed on it are located at the upper part of tank 1, conical plug 307 tightly seals the conical opening 305 at the bottom of separation box 302 to ensure the sealing of the inside of separation box 302. After construction begins, pump 102 starts, and the mixed medium containing a large amount of water, air and soft soil impurities (including plant residues, large particles of sand and gravel) collected in the vacuum pre-compression pipeline is extracted through the liquid extraction pipe 103. The mixed medium passes through the liquid outlet pipe 104 and the slidingly connected limit pipe 105, and finally... Finally, the mixture is ejected from the nozzle, activating motor 308. This motor, via crossbar 309, drives gear 310 to rotate, which in turn drives separator 302 to rotate at a low, uniform speed. The mixed medium is sprayed onto the inner wall of the rotating separator 302. Under centrifugal force, water containing small particles and impurities, passing through multiple separation holes 303, is ejected and falls into the lower water collection area of ​​tank 1. Larger impurities (such as plant roots and large stones) are retained inside separator 302. The clear water (containing trace amounts of fine particles) deposited at the bottom of tank 1 is drawn out by pump 501 through one of the outlet pipes 502. When impurities in separator 302 are removed... When sediment accumulates to a certain level, or when periodic maintenance is required, the hydraulic rod 2 extends, pushing the fixed frame 201 and the entire separation box 302 to move vertically downwards. At this time, the conical plug 307 remains fixed on the L-shaped bracket 306. As the separation box 302 moves downwards, the conical opening 305 is opened. Under the action of gravity, the deposited impurities in the separation box 302 fall into the collection box 408 below through the open conical opening 305 and guided by the inclined groove 404. The annular scraper 403 and the cleaning cotton 405 are in close contact with the inner wall of the separation box 302. Due to the relative movement between the two, the annular scraper 403 continuously scrapes away impurities. The sticky mud and impurities adhering to the inner wall are prevented from hardening and clogging the mesh. The jet sprayed from the nozzle 106 impacts the cylindrical block 401 located at the top center of the separation box 302. The water flow splashes outwards along the cylindrical block 401, evenly rinsing the inner wall of the separation box 302. The cleaning cotton 405 assists in completing the cleaning work. At the same time, the residual sewage is discharged into the bottom of the tank 1 through the filter hole 409 on the collection box 408. After cleaning, the hydraulic rod 2 retracts, the separation box 302 rises and resets, and the conical plug 307 re-blocks the conical opening 305. The operator only needs to periodically pull out the collection box 408 and pour out the large pieces of impurities.

[0023] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A water-air separation tank for vacuum preloading construction of soft soil subgrade, comprising a tank body (1) and a placement platform (5), characterized in that, A support frame (101) is fixedly installed on the tank (1), and a first pump body (102) is fixedly installed on the support frame (101). A liquid suction pipe (103) is installed at one end of the first pump body (102), and a liquid outlet pipe (104) connected to the tank (1) is installed at the other end of the first pump body (102). A limit pipe (105) is slidably installed on the liquid outlet pipe (104), and a spray pipe (106) is installed at one end of the limit pipe (105). A hydraulic rod (2) is fixedly installed on the tank (1), and a fixing frame (201) that is fixedly connected to the limiting tube (105) is fixedly installed on the movable end of the hydraulic rod (2). The fixed frame (201) is equipped with a separation mechanism (3) for separating larger impurities in the liquid, and the tank (1) is equipped with a cleaning mechanism (4) to prevent larger impurities from accumulating inside the tank (1). The fixed frame (201) is moved downward by the hydraulic rod (2) so that the larger impurities in the separation mechanism (3) enter the cleaning mechanism (4).

2. A water-air separator for vacuum preloading construction of soft soil subgrade according to claim 1, characterized in that, The separation mechanism (3) includes a bearing (301) fixedly installed on a fixed frame (201), and a separation box (302) fixedly connected to the bearing (301) is rotatably installed on the fixed frame (201). Multiple sets of separation holes (303) are evenly opened on the separation box (302).

3. A water-air separator for vacuum preloading construction of soft soil subgrade according to claim 2, characterized in that, The separation mechanism (3) also includes an external toothed ring (304) fixedly installed on the separation box (302). The separation box (302) has a conical opening (305). An L-shaped bracket (306) is fixedly installed on the tank (1). A conical plug (307) that cooperates with the conical opening (305) is rotatably installed on the L-shaped bracket (306).

4. A water-air separator for vacuum preloading construction of soft soil subgrade according to claim 3, characterized in that, The separation mechanism (3) also includes a motor (308) fixedly installed on the tank (1). The output end of the motor (308) is fixedly installed with a cross rod (309) rotatably connected to the L-shaped bracket (306). A gear (310) that meshes with the external gear ring (304) and is slidably connected to the cross rod (309) is rotatably installed on the fixed frame (201).

5. A water-air separation tank for vacuum preloading construction of soft soil subgrade according to claim 3, characterized in that, The cleaning mechanism (4) includes a cylindrical block (401) fixedly installed on a conical plug (307), and four sets of connecting rods (402) are evenly installed on the cylindrical block (401). An annular scraper (403) that contacts the inner wall of the separation box (302) is installed on the connecting rods (402).

6. A water-air separator for vacuum preloading construction of soft soil subgrade according to claim 5, characterized in that, The cleaning mechanism (4) also includes a sloping groove (404) on an annular scraper (403), a cleaning cotton (405) that contacts the inner wall of the separation box (302) is installed on the annular scraper (403), a conical groove (406) is provided on the separation box (302), and a limiting groove (407) is provided on the tank (1).

7. A water-air separation tank for vacuum preloading construction of soft soil subgrade according to claim 6, characterized in that, The cleaning mechanism (4) also includes a collection box (408) that is slidably installed on the limiting groove (407). Multiple sets of filter holes (409) are evenly opened on the collection box (408), and a handle (410) is installed on the collection box (408).

8. A water-air separator for vacuum preloading construction of soft soil subgrade according to claim 1, characterized in that, A second pump body (501) is fixedly installed on the placement platform (5). Two sets of water outlet pipes (502) are installed on the second pump body (501), one of which is connected to the tank (1).

9. A water-air separator for vacuum preloading construction of soft soil subgrade according to claim 1, characterized in that, The tank (1) is equipped with an exhaust pipe (6) that communicates with its interior, and an electromagnetic valve (601) is installed on the exhaust pipe (6).

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