Vacuum dewatering equipment and process for mucky silt layer

Abstract

The invention relates to the technical field of well point drainage, in particular to sludge silt layer vacuum dewatering equipment and process. The vacuum dewatering equipment for the mucky silt layer comprises a well casing, a first pipe, a second pipe, an energy storage assembly, an impact assembly and a trigger assembly. A water filtering section is arranged at the lower end of the well casing and extends into a well point, one ends of the first pipe and the second pipe are communicated with the upper end of the well casing, a first piston is arranged in the first pipe, a second piston is arranged in the second pipe, the ends, away from the well casing, of the first pipe and the second pipe are communicated, and the diameter of the first pipe is smaller than that of the second pipe. The energy storage assembly provides energy for resetting of the first piston when the water filtering section is blocked. The trigger assembly limits the position of the second piston when the first piston is reset. The positions of the first piston and the second piston are adjusted through the change of the pressure intensity in the well pipe, so that the pressure intensity in the well pipe is increased when the first piston is reset, water in the well pipe is discharged out of the water filtering section, and cleaning of the water filtering section is completed.

Description

Technical Field

[0001] This invention relates to the field of wellpoint drainage technology, and in particular to a vacuum dewatering device and process for silty sand layers. Background Technology

[0002] In the construction industry, especially in projects involving silty sand layers, vacuum dewatering is a crucial step in ensuring construction safety and efficiency. By extracting groundwater using vacuum dewatering equipment, the groundwater level can be effectively lowered, improving the physical and mechanical properties of the foundation soil and avoiding risks such as piping and quicksand during excavation, thus creating a stable environment for subsequent construction. Therefore, the stable operation of vacuum dewatering equipment directly affects the construction progress and quality of building projects. However, when using traditional vacuum dewatering equipment to pump water through silty sand layers, a common technical challenge is filter clogging. Because this geological layer contains a large amount of silt and fine sand, during pumping, the silt flows through the sand layer with the water, gradually adhering to and clogging the filter screen on the outside of the filter pipe section. Once the filter screen is clogged, the water flow channel is blocked, the vacuum dewatering equipment cannot extract groundwater normally, leading to a sharp decline in dewatering efficiency, and even forcing construction to be suspended, severely impacting the project's progress.

[0003] To address this issue, existing technologies typically employ manual backflushing: the well casing and main pipe must first be disassembled, and then high-pressure water is manually introduced into the well casing to impact the filter screen and remove the sludge. However, the process of disassembling and reassembling the well casing and main pipe is cumbersome, consuming significant manpower and time, further extending the construction downtime. Moreover, it is difficult to precisely control the flushing force and range of the high-pressure water manually, which may result in incomplete removal of the blockage due to insufficient flushing, or damage to the filter screen structure due to excessive flushing, shortening the equipment's lifespan. Summary of the Invention

[0004] Therefore, it is necessary to provide a vacuum dewatering device and process for silty sand layers to address the problem of complex filter cleaning processes in current vacuum dewatering equipment.

[0005] The above objectives are achieved through the following technical solutions: A vacuum dewatering device for silty sand layers is used to extract water from a wellpoint into a storage tank. It includes a piping system and a vacuum system. The piping system includes a well pipe, a first pipe, a second pipe, a casing, an energy storage component, an impact component, and a triggering component. The lower end of the well pipe has a filter section extending into the wellpoint, and the well pipe has an outlet. One end of the first pipe and the second pipe are respectively connected to the upper end of the well pipe. A first piston is installed inside the first pipe, and a second piston is installed inside the second pipe. The ends of the first and second pipes furthest from the well pipe are connected by a connecting pipe filled with water. The connecting pipe can connect to the storage tank. The diameter of the first pipe is smaller than the diameter of the second pipe. When the filter section is blocked, the second piston... The second pipe slides towards the well pipe and drives the first piston to slide away from the well pipe; the casing is slidably disposed in the well pipe and the first pipe and slidably connected to the first piston, used to block the outlet when the first piston moves away from the well pipe; the energy storage component is used to provide the reset power for the first piston and the second piston; the impact component is used to connect the connecting pipe to the water storage tank when the casing blocks the outlet; the trigger component is used to fix the position of the second piston and the casing when the outlet is blocked and to remove the restriction on the position of the second piston and the casing after the first piston is reset; the vacuum mechanism is used to draw water from the well pipe into the water storage tank from the outlet and to store energy in the energy storage component when the filter section is blocked.

[0006] Preferably, the first piston includes a first pull rod and a first slide rod. The first pull rod passes through the first pipe and is slidably connected to the first pipe along the axial direction of the first pipe. The first pipe is coaxial with the well pipe. The first slide rod is installed at the end of the first pull rod near the well pipe. The casing is sleeved on the first slide rod and is slidably connected to the first pipe and the first slide rod respectively. When the first slide rod is away from the well pipe, it can abut against the casing. The first slide rod and the casing divide the first pipe into two vertically arranged and mutually isolated chambers.

[0007] Preferably, the second piston includes a second pull rod and a second slide bar. The second pull rod passes through the second pipe and is slidably connected to the second pipe along the axial direction of the second pipe. The second slide bar is installed at the end of the second pull rod near the well pipe and can divide the second pipe into two chambers arranged along the axial direction of the second pipe. The chamber away from the well pipe is connected to the chamber away from the well pipe in the first pipe through a connecting pipe between the first pipe and the second pipe.

[0008] Preferably, the energy storage component includes a first spring and a second spring. The first spring is sleeved on the first pull rod and connected to the first tube and the first sliding column. The second spring is sleeved on the second pull rod and connected to the second tube and the second pull rod.

[0009] Preferably, both the end of the first pull rod located outside the first tube and the end of the second pull rod located outside the second tube are provided with positioning blocks, which are used to limit the positions of the first slide bar and the second slide bar, respectively.

[0010] Preferably, the impact assembly includes a sliding sleeve and a third spring. The sliding sleeve is sleeved on the second tie rod and slidably connected to the second tie rod. The second pipe is provided with an interface, and the connecting pipe is connected to the second pipe through the interface. The sliding sleeve is located in the second pipe and is located on the side of the interface away from the second sliding column. The third spring is sleeved on the second tie rod and connects the second sliding column and the sliding sleeve. A retaining ring is provided inside the second pipe. The sliding sleeve is located between the second sliding column and the retaining ring, and the sliding sleeve can engage with the retaining ring to further divide the chamber in the second pipe away from the well pipe into two small chambers that can be isolated from each other. A suction pipe connected to the water storage tank is provided on the second pipe, and the suction pipe is located on the side of the retaining ring away from the connecting pipe.

[0011] Preferably, the casing has a second hole and a third hole, with the second hole located above the third hole. A stop block is provided on the circumferential surface of the first sliding column, and the stop block is slidably disposed in the second hole. The stop block is slidably connected to the casing and the first tube. When the first sliding column is in the initial position, the stop block is in the first tube. The triggering assembly includes a push rod, a spring, and a fourth spring. The push rod is slidably disposed on the second sliding column along the axial direction of the second tube. The spring is inclinedly disposed on the circumferential surface of the push rod. The spring gradually approaches the second pull rod from the side closer to the push rod to the side farther away from the push rod. When the outlet is blocked, the push rod is slidably disposed in the third hole and is engaged with the casing by the spring and the casing. The second tube is located between the first tube and the well pipe. The first sliding column can abut against the spring when it is reset. The fourth spring is sleeved on the push rod and connected to the push rod and the second sliding column.

[0012] Preferably, the upper end of the well casing is provided with an expansion pipe, and the first pipe and the second pipe are respectively connected to the expansion pipe and communicate with the well casing through the expansion pipe. The cross-sectional dimension of the expansion pipe is larger than the cross-sectional dimension of the first pipe and the second pipe.

[0013] Preferably, the vacuum mechanism includes a vacuum pump and a main pipe, which are connected. The pipeline mechanism has multiple parts, and the well pipe in each pipeline mechanism is connected to the main pipe through its outlet.

[0014] This invention also provides a vacuum dewatering process for silty sand layers, utilizing the aforementioned vacuum dewatering equipment for silty sand layers, comprising the following steps: S1, excavate well points and excavate a water storage tank near the well points.

[0015] S2, place the end of the well pipe with the filter section into the well point, and fill the part where the first pipe and the second pipe connect with water.

[0016] S3, Install a vacuum mechanism, which extracts water from the well pipe using negative pressure.

[0017] S4. If the filter section is blocked, the vacuum mechanism continues to extract water from the well pipe, causing the pressure inside the well pipe to continue to decrease. The second piston is attracted to the well pipe by the suction of the vacuum mechanism and moves the first piston away from the well pipe through the water inside the connecting pipe, and the energy storage component stores energy.

[0018] S5, the sleeve blocks the outlet, triggering the component to restrict the sleeve position.

[0019] S6, the impact component starts to connect the connecting pipe to the water storage tank, and the energy storage component releases energy.

[0020] S7, the first piston resets, the pressure inside the well pipe increases, and the water inside the well pipe is discharged from the filter section to backflush the filter section.

[0021] S8, the first piston reset causes the second piston to reset under the action of the energy storage component through the trigger component, and the sleeve resets.

[0022] The beneficial effects of this invention are as follows: When the filter section is blocked, the vacuum mechanism generates negative pressure inside the well pipe. Through the cooperation of the first and second pipes, the negative pressure causes the second piston to approach the well pipe and pull the first piston away from the well pipe. A triggering component, along with the cooperation of the first and second pistons, ensures that when the vacuum mechanism stops pumping into the well pipe, the first piston moves in the opposite direction under the negative pressure inside the well pipe, causing the negative pressure to disappear. An energy storage component causes the first piston to fully reset and increases the pressure inside the well pipe, causing water to be discharged from the filter section and backflushing it. Simultaneously, the energy storage component resets the second piston, and the casing can also reset under its own weight, enabling repeated cleaning of the filter section, improving automation, and reducing manual labor intensity. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a vacuum dewatering device for silty sand layers provided in an embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the pipeline structure of a vacuum dewatering device for silty sand layers provided in an embodiment of the present invention; Figure 4 Right view of the pipeline structure of a vacuum dewatering device for silty sand layers provided in an embodiment of the present invention; Figure 5 for Figure 4 Sectional view along the BB direction; Figure 6 for Figure 5 Enlarged view of point C in the middle; Figure 7 A diagram illustrating the blockage of the filter section in a vacuum dewatering device for silty sand layers, provided in an embodiment of the present invention. Figure 8 for Figure 7 Enlarged view at point D; Figure 9A diagram illustrating the state of a vacuum dewatering device for silty sand layers when its outlet is blocked, provided as an embodiment of the present invention. Figure 10 for Figure 9 Enlarged view of point E in the middle.

[0024] in: 100. Water storage tank; 101. Well point; 102. Well casing; 103. First pipe; 104. Second pipe; 105. Casing; 106. Filter section; 107. Outlet; 108. First tie rod; 109. First sliding column; 110. First hole; 111. Second tie rod; 112. Second sliding column; 113. First spring; 114. Second spring; 115. Sliding sleeve; 116. Third spring; 117. Retaining ring; 118. Suction pipe; 119. Rubber block; 120. Second hole; 121. Third hole; 122. Stop block; 123. Top rod; 124. Spring piece; 125. Fourth spring; 126. Slide groove; 127. Through groove; 128. Clamping rod; 129. Expanding pipe; 130. Vacuum pump; 131. Main pipe; 133. Connecting pipe. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0026] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] like Figures 1 to 10 As shown, this embodiment of the invention provides a vacuum dewatering device for silty sand layers, used to extract water from well point 101 into a reservoir 100. It includes a pipeline mechanism and a vacuum mechanism. The pipeline mechanism includes a well pipe 102, a first pipe 103, a second pipe 104, a casing 105, an energy storage component, an impact component, and a triggering component. The lower end of the well pipe 102 has a filter section 106 extending into the well point 101, and the well pipe 102 has an outlet 107. One end of the first pipe 103 and the second pipe 104 are respectively connected to the upper end of the well pipe 102. A first piston is installed in the first pipe 103, and a second piston is installed in the second pipe 104. The ends of the first pipe 103 and the second pipe 104 away from the well pipe 102 are connected by a connecting pipe 133 and filled with water. The connecting pipe 133 can connect to the reservoir 100. The diameter of the first pipe 103 is smaller than the diameter of the second pipe 104. When 106 is blocked, the second piston slides within the second pipe 104 toward the well pipe 102 and drives the first piston to slide away from the well pipe 102 within the first pipe 103; the casing 105 is slidably disposed in the well pipe 102 and the first pipe 103 in the vertical direction and is slidably connected to the first piston, and is used to block the outlet 107 when the first piston moves away from the well pipe 102; the energy storage component is used to provide the power for the first piston and the second piston to reset; the impact component is used to connect the connecting pipe 133 to the water storage tank 100 when the casing 105 blocks the outlet 107; the trigger component is used to fix the position of the second piston and the casing 105 when the outlet 107 is blocked and to remove the restriction on the position of the second piston and the casing 105 after the first piston is reset; the vacuum mechanism is used to extract water from the well pipe 102 from the outlet 107 and discharge it into the water storage tank 100, and to store energy in the energy storage component when the filter section 106 is blocked.

[0029] When the filter section 106 becomes clogged, the vacuum mechanism creates negative pressure inside the well casing 102. Through the coordinated arrangement of the first pipe 103 and the second pipe 104, this negative pressure causes the second piston to move closer to the well casing 102. The second piston, via the connecting pipe 133, moves the first piston away from the well casing 102. A trigger assembly, through the coordination of the first and second pistons, ensures that when the vacuum mechanism stops pumping into the well casing 102, the first piston moves in the opposite direction under the negative pressure inside the well casing 102, causing the negative pressure to disappear. An energy storage assembly causes the first piston to fully reset and increases the pressure inside the well casing 102, causing water to be discharged from the filter section 106, backflushing the filter section 106. Simultaneously, the energy storage assembly resets the second piston, and the casing 105 also resets under its own weight, enabling repeated cleaning of the filter section 106, improving automation and reducing manual labor intensity.

[0030] In this embodiment, the ends of the first tube 103 and the second tube 104 away from the well pipe 102 are both closed. The first piston includes a first pull rod 108 and a first sliding rod 109. The first pull rod 108 passes through the first tube 103 and is slidably connected to the first tube 103 along the axial direction of the first tube 103. The first tube 103 is coaxial with the well pipe 102. The first sliding rod 109 is installed at the end of the first pull rod 108 near the well pipe 102. The casing 105 is sleeved on the first sliding rod 109 and is slidably connected to the first tube 103 and the first sliding rod 109 respectively. When the first sliding rod 109 is away from the well pipe 102, it can abut against the casing 105. The first sliding rod 109 and the casing 105 divide the first tube 103 into two vertically arranged and mutually isolated chambers. When the first sliding rod 109 or the casing 105 slides in the vertical direction, the volumes of the two chambers change synchronously and are negatively correlated. The casing 105 has a first hole 110 on its side. When the filter section 106 is not blocked, the outlet 107 is connected to the inside of the well pipe 102 through the first hole 110, so that the vacuum mechanism can draw water from the well pipe 102.

[0031] In this embodiment, the axis of the second pipe 104 is perpendicular to the well pipe 102. The second piston includes a second pull rod 111 and a second slide rod 112. The second pull rod 111 passes through the second pipe 104 and is slidably connected to the second pipe 104 along the axial direction of the second pipe 104. The second slide rod 112 is installed at one end of the second pull rod 111 near the well pipe 102 and can divide the second pipe 104 into two chambers arranged along the axial direction of the second pipe 104. One chamber away from the well pipe 102 is connected to one chamber in the first pipe 103 away from the well pipe 102 through a connecting pipe 133 between the first pipe 103 and the second pipe 104. Since the two chambers connected to the connecting pipe 133 are filled with water, when the volume of one chamber increases, the volume of the other chamber will decrease relatively. That is, when the second slide rod 112 moves closer to the well pipe 102, the first slide rod 109 moves away from the well pipe 102. The cross-sectional area of ​​the second pipe 104 is larger than that of the first pipe 103. After the filter section 106 is blocked, the force exerted by the suction mechanism on the second sliding column 112 is greater than that on the first sliding column 109. The second sliding column 112 moves closer to the well pipe 102, thereby driving the first sliding column 109 away from the well pipe 102, which in turn enables the energy storage component to store energy.

[0032] In this embodiment, the energy storage component includes a first spring 113 and a second spring 114. The first spring 113 is sleeved on the first pull rod 108 and connects the first tube 103 and the first sliding column 109. The second spring 114 is sleeved on the second pull rod 111 and connects to the second tube 104 and the second pull rod 111. When the second pull rod 111 is close to the well pipe 102 and the first pull rod 108 is away from the well pipe 102, the first spring 113 and the second spring 114 respectively store energy and provide a restoring force for the first pull rod 108 and the second pull rod 111 after the suction force of the vacuum mechanism disappears.

[0033] In this embodiment, the first pull rod 108 located at one end outside the first tube 103 and the second pull rod 111 located at one end outside the second tube 104 are both provided with positioning blocks, which are used to limit the positions of the first sliding column 109 and the second sliding column 112, respectively.

[0034] The second spring 114 is disposed outside the second tube 104. The second spring 114 is connected to the second pull rod 111 via a positioning block on the second pull rod 111. The end of the second spring 114 away from the second tube 104 abuts against the positioning block on the second pull rod 111, which can save the length of the second tube 104. The positioning block on the first pull rod 108 is threadedly connected to the second pull rod 111, which can adjust the position of the second sliding column 112 relative to the second tube 104.

[0035] In this embodiment, the impact assembly includes a sliding sleeve 115 and a third spring 116. The sliding sleeve 115 is sleeved on the second pull rod 111 and slidably connected to the second pull rod 111. The second pipe 104 is provided with an interface, and the connecting pipe 133 is connected to the second pipe 104 through the interface. The sliding sleeve 115 is located in the second pipe 104 and is located on the side of the interface away from the second sliding column 112. The third spring 116 is sleeved on the second pull rod 111 and connects the second sliding column 112 and the sliding sleeve 115. The second pipe 104 is provided with a retaining ring 117. The sliding sleeve 115 is located between the second sliding column 112 and the retaining ring 117, and the sliding sleeve 115 can engage with the retaining ring 117 to further divide the chamber in the second pipe 104 away from the well pipe 102 into two small chambers that can be isolated from each other. The second pipe 104 is provided with a suction pipe 118 connected to the water storage tank 100. The suction pipe 118 is located on the side of the retaining ring 117 away from the connecting pipe 133.

[0036] Specifically, the sliding sleeve 115 is provided with a rubber block 119, which is elastic and engages with the retaining ring 117 in the axial direction of the second tube 104. When the outlet 107 is not blocked, the sliding sleeve 115 is engaged with the retaining ring 117, and the connecting pipe 133 is not connected to the water storage tank 100. When the filter section 106 is blocked, as the second sliding column 112 moves closer to the well pipe 102, the third spring 116 is gradually stretched, and the pulling force of the third spring 116 on the sliding sleeve 115 gradually increases until the outlet 107 is blocked. At this point, the third spring 116 can pull the sliding sleeve 115 to slide, causing the rubber block 119 to separate from the retaining ring 117, so that the connecting pipe 133 is connected to the water storage tank 100 through the suction pipe 118. The first sliding column 109 is no longer affected by the second sliding column 112, and then gradually resets under the action of the first spring 113. The positions of the second sliding column 112 and the casing 105 do not change under the action of the triggering component, so that the water in the well pipe 102 can be discharged from the filter section 106.

[0037] Specifically, for ease of installation and subsequent maintenance, the first tube 103 and the second tube 104 are designed as separate units.

[0038] In this embodiment, the sleeve 105 is provided with a second hole 120 and a third hole 121. The second hole 120 is located above the third hole 121. A stop block 122 is provided on the circumferential surface of the first sliding post 109. The stop block 122 is slidably disposed in the second hole 120. The stop block 122 is slidably connected with the sleeve 105 and the first tube 103. When the first sliding post 109 is in the initial position, the stop block 122 is in the first tube 103. When the first hole 110 is connected to the outlet 107, the second pipe 104 is connected to the well pipe 102 through the second hole 120. When the outlet 107 is gradually blocked by the casing 105, the casing 105 will slide in the first pipe 103, and the second hole 120 will also enter the second pipe 104. The second sliding column 112 and the stop block 122 can divide the inside of the casing 105 into two mutually isolated chambers, so that the connecting pipe 133 will not be connected to the well pipe 102 through the first pipe 103. During the reset process of the first sliding column 109, the pressure inside the well pipe 102 is maintained, so that the water inside the well pipe 102 can be better discharged from the filter section 106.

[0039] The triggering assembly includes a push rod 123, a spring 124, and a fourth spring 125. The push rod 123 is slidably mounted on the second slide column 112 along the axial direction of the second tube 104. The spring 124 is inclinedly mounted on the circumferential surface of the push rod 123. The spring 124 gradually approaches the second pull rod 111 from the side closest to the push rod 123 to the side furthest from the push rod 123. When the outlet 107 is blocked, the push rod 123 is slidably mounted in the third hole 121 and is engaged with the sleeve 105 by the spring 124. The second tube 104 is located between the first tube 103 and the well tube 102. The first slide column 109 can abut against the spring 124 when resetting. The fourth spring 125 is sleeved on the push rod 123 and connected to the push rod 123 and the second slide column 112.

[0040] Specifically, the second sliding column 112 has a groove 126 at the end away from the second tie rod 111. The groove 126 passes through the second sliding column 112 and extends into the second tie rod 111. One end of the top rod 123 is slidably disposed in the groove 126. The second tie rod 111 has a through groove 127 on its circumferential surface. The through groove 127 communicates with the groove 126. The top rod 123 has a locking rod 128 at the end located in the groove 126. The locking rod 128 is slidably disposed in the through groove 127 and restricts the relative movement of the top rod 123 and the second sliding column 112. During the process of blocking the outlet 107, the push rod 123 will gradually approach the sleeve 105 under the action of the second sliding column 112 until it contacts the sleeve 105. At this time, the push rod 123 will slide in contact with the sleeve 105, and the second sliding column 112 will compress the fourth spring 125 until the third hole 121 moves to the position of the push rod 123. The push rod 123 will extend into the third hole 121 under the action of the first spring 113, and the spring piece 124 will also slide in connection with the sleeve 105 and be bent into the inside of the sleeve 105. Under the action of the energy storage component and the impact component, the first sliding column 109 will gradually reset, while the spring piece 124 will engage with the casing 105 to prevent the second sliding column 112 from resetting, causing the internal pressure of the well pipe 102 to gradually increase, and the water in the well pipe 102 can be discharged from the filter section 106; until the first sliding column 109 and the spring piece 124 abut against each other, causing the spring piece 124 to disengage from the casing 105, and the second sliding column 112 resets.

[0041] In this embodiment, the upper end of the well pipe 102 is provided with a bulging pipe 129. The first pipe 103 and the second pipe 104 are respectively connected to the bulging pipe 129 and communicate with the well pipe 102 through the bulging pipe 129. The cross-sectional dimension of the bulging pipe 129 is larger than the cross-sectional dimensions of the first pipe 103 and the second pipe 104. When the outlet 107 is blocked, the second sliding column 112 is located at the end of the second pipe 104 near the bulging pipe 129. The fourth spring 125 has been compressed and begins to release energy to push the push rod 123 to slide. Under its own inertia and the drive of the connecting rod, the second sliding column 112 continues to approach the bulging pipe 129 until it briefly separates from the second pipe 104. The water in the second pipe 104 will flow into the bulging pipe 129. Then, the second sliding column 112 will return to the first pipe 103 under the reset action of the first sliding column 109 and the action of the second spring 114. The second pipe 104 replenishes water into the well pipe 102, which can increase the pressure in the well pipe 102 when the first sliding column 109 is reset, so that the water in the well pipe 102 can better clean the filter section 106.

[0042] In this embodiment, the vacuum mechanism includes a vacuum pump 130 and a main pipe 131, which are connected. The pipeline mechanism is provided in multiple ways, and the well pipe 102 in each pipeline mechanism is connected to the main pipe 131 through the outlet 107 on it.

[0043] The working principle of the vacuum dewatering device for silty sand layers provided in the above embodiments is as follows: First, a well point 101 is dug and a water storage tank 100 is dug near the well point 101. Then, the well pipe 102 is inserted into the well point 101, so that the filter section 106 on the well pipe 102 is below the water level in the well point 101. Then, one end of the suction pipe 118 is put into the water storage tank 100, and the suction pipe 118 and the connecting pipe 133 are filled with water, so that the first sliding column 109 and the second sliding column 112 can move synchronously, and the connecting pipe 133 can draw water when it is connected to the water storage tank 100 through the suction pipe 118, ensuring normal use in the future.

[0044] Then, the main pipe 131 is connected to the outlet 107 on each well pipe 102, and the vacuum pump 130 is started. The vacuum pump 130 draws a vacuum inside the well pipe 102 through the main pipe 131, generating negative pressure inside the well pipe 102 and drawing the water in the well point 101 through the filter section 106 into the well pipe 102. The water in the well pipe 102 increases continuously and then enters the main pipe 131 from the outlet 107, and is then discharged into the water storage tank 100 by the vacuum pump 130.

[0045] After the filtration section 106 has been working for a period of time, the impurities attached to its surface will gradually increase, and the degree of blockage in the filtration section 106 will gradually increase. As the degree of blockage in the filtration section 106 increases, the pressure in the well pipe 102 gradually decreases, and the tension on the second sliding column 112 gradually increases. The second sliding column 112 slides in the second pipe 104 and moves closer to the expansion pipe 129. The second sliding column 112, through the connecting pipe 133 and the water in the connecting pipe 133, drives the first sliding column 109 away from the expansion pipe 129. When the first sliding column 109 moves away from the expansion pipe 129, it drives the casing 105 to slide upward in the well pipe 102 and the first pipe 103. The sliding of the casing 105 causes the first hole 110 on it to gradually separate from the outlet 107.

[0046] As the casing 105 moves upward, the second sliding rod 112 drives the push rod 123 to move and contact the push rod 123 with the casing 105, and the fourth spring 125 is gradually compressed. When the first hole 110 separates from the outlet 107, the vacuum pump 130 no longer draws negative pressure into the well casing 102. At this time, the third hole 121 on the casing 105 comes to the position corresponding to the push rod 123. Under the action of the fourth spring 125, the push rod 123 slides relative to the second sliding rod 112 and passes through the third hole 121 into the casing 105. At the same time, the push rod 123 drives the spring piece 124 to move into the casing 105. When the spring piece 124 passes through the third hole 121, it is squeezed by the casing 105 and moves closer to the push rod 123, and returns to its original position after entering the casing 105. When the second sliding column 112 separates from the outlet 107 and the first hole 110, it will move closer to the expansion pipe 129 due to its own inertia and the action of the fourth spring 125. At this time, the second sliding column 112 separates from the second pipe 104 and enters the expansion pipe 129. The water in the part of the second pipe 104 that is connected to the connecting pipe 133 will enter the well pipe 102. At the same time, the second sliding column 112 drives the sliding sleeve 115 to slide on the second pull rod 111 through the third spring 116. The rubber block 119 on the sliding sleeve 115 separates from the retaining ring 117. The interior of the connecting pipe 133 and the well pipe 102 are both connected to the suction pipe 118. The water in the suction pipe 118 is replenished to the connecting pipe 133 and the well pipe 102. The sliding sleeve 115 moves closer to the second sliding column 112 under the action of the third spring 116. The second sliding column 112 returns to the second pipe 104 under the action of the second spring 114.

[0047] Then the first spring 113 releases energy, pushing the first sliding column 109 closer to the expansion pipe 129. At this time, the sliding sleeve 115 and the second sliding column 112 will not reset under the cooperation of the spring piece 124 and the casing 105. The pressure in the well pipe 102 increases, and the water in the well pipe 102 is discharged into the well point 101 through the filter section 106, realizing the backflushing and cleaning of the filter section 106. When the first sliding column 109 resets, it will abut against the spring piece 124. The spring piece 124 moves closer to the push rod 123 and no longer abuts against the casing 105. The second sliding column 112 resets under the action of the second spring 114. The second sliding column 112 drives the sliding sleeve 115 to move synchronously. After the rubber block 119 on the sliding sleeve 115 contacts the retaining ring 117, it locks again, and the connecting pipe 133 is isolated from the water storage tank 100.

[0048] The casing 105 moves downward under its own weight, and the first hole 110 is connected to the water outlet 107 again, and the vacuum pump 130 continues to pump water from the well casing 102.

[0049] This invention also provides a vacuum dewatering process for silty sand layers, utilizing the aforementioned vacuum dewatering equipment for silty sand layers, comprising the following steps: S1, excavate multiple well points 101 arranged in sequence, fill the well points 101 with sand and gravel, and excavate a water storage tank 100 near the well points 101 to hold the water pumped out from the well points 101; S2, place one end of the well pipe 102 with the filter section 106 into the well point 101, and fill the part where the first pipe 103 and the second pipe 104 are connected with water; connect the suction pipe 118 to the second pipe 104, and put the other end of the suction pipe 118 into the water storage tank 100.

[0050] S3. Install a vacuum mechanism. The vacuum mechanism uses negative pressure to extract water from the well pipe 102. Connect the main pipe 131 to each outlet 107, start the vacuum pump 130, and the vacuum pump 130 draws water from each well pipe 102 through the main pipe 131 and discharges the water from the well pipe 102 into the water storage tank 100.

[0051] S4, if the water filter section 106 is blocked, the vacuum mechanism continues to extract water from the well pipe 102, causing the internal pressure of the well pipe 102 to continue to decrease; the second piston is affected by the suction of the vacuum mechanism and moves closer to the well pipe 102, and the water inside the connecting pipe 133 drives the first piston away from the well pipe 102, and the energy storage component stores energy; during the process of the vacuum pump 130 extracting water, the water filter section 106 will filter the water in the well pipe 102, and the water filter section 106 is easily blocked. As time goes on, the amount of water entering the well pipe 102 through the filtration section 106 will decrease until it is completely blocked. During this process, the vacuum pump 130 is always working, and the pressure in the well pipe 102 will gradually decrease. The second slide column 112 will also move closer to the expansion pipe 129 in the second pipe 104 under the suction of the vacuum pump 130. Under the action of the water in the connecting pipe 133, the second slide column 112 drives the first slide column 109 to slide synchronously. The first slide column 109 gradually moves away from the expansion pipe 129 in the first pipe 103. At this time, the first spring 113 and the second spring 114 are compressed and begin to store energy.

[0052] S5, the sleeve 105 blocks the outlet 107, and the trigger component restricts the position of the sleeve 105; when the first sliding column 109 moves away from the expander 129, it will drive the sleeve 105 to slide together. The sliding of the sleeve 105 causes the first hole 110 to gradually move away from the outlet 107 until it is completely separated from the outlet 107. During this process, the second sliding column 112 drives the push rod 123 to contact the sleeve 105 and compress the fourth spring 125. When the first hole 110 is completely separated from the outlet 107, the third hole 121 on the sleeve 105 moves to the position corresponding to the push rod 123. Under the action of the fourth spring 125, the push rod 123 is inserted into the sleeve 105 through the third hole 121. The spring piece 124 is also deformed by the compression of the sleeve 105 and enters the sleeve 105 through the third hole 121. The spring piece 124 in the sleeve 105 loses the compression of the sleeve 105, restores its original shape, and abuts against the inner wall of the sleeve 105. At this point, sleeve 105 and second slide bar 112 cannot be reset.

[0053] S6, the impact component is activated to connect the connecting pipe 133 to the water storage tank 100, and the energy storage component releases energy; when the second sliding column 112 slides, the third spring 116 is stretched, and the sliding sleeve 115 is pulled and tends to move closer to the second sliding column 112. When the outlet 107 is completely blocked, the third spring 116 pulls the sliding sleeve 115 to separate from the retaining ring 117, and the connecting pipe 133 is connected to the water storage tank 100 through the suction pipe 118. The first spring 113 in the energy storage component releases energy and causes the first sliding column 109 to move closer to the second sliding column 112.

[0054] S7, the first piston resets, the pressure inside the well pipe 102 increases, the water inside the well pipe 102 is discharged from the filter section 106, and the filter section 106 is backflushed; as the first sliding column 109 approaches the second sliding column 112, the pressure inside the well pipe 102 will increase accordingly, and the water inside the well pipe 102 will be squeezed out from the filter section 106.

[0055] S8, the first piston resets, causing the second piston to reset under the action of the energy storage component, and the sleeve 105 resets. When the first sliding column 109 resets under the action of the first spring 113, it will abut against the spring piece 124. After the spring piece 124 is in contact with the push rod 123, it will no longer abut against the sleeve 105. The second sliding column 112 and the push rod 123 will be reset by the tension of the third spring 116. After the sleeve 105 separates from the push rod 123, it will gradually reset under its own gravity, so that the outlet 107 is connected to the first hole 110.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A vacuum dewatering apparatus for a muddy silt layer, for pumping water in a well point to a reservoir, characterized by, The utility model relates to a kind of water well point, comprising: Pipeline mechanism and vacuum mechanism, pipeline mechanism includes well pipe, first pipe, second pipe, sleeve pipe, energy storage component, impact component and trigger component, well pipe lower end is equipped with filter section and stretches into well point, well pipe upper end is equipped with water outlet;First pipe and second pipe one end are communicated with the upper end of well pipe respectively, first pipe is equipped with first piston, second pipe is equipped with second piston, first pipe and second pipe end away from well pipe are communicated by communicating pipe and are filled with water inside, communicating pipe can be communicated with reservoir, the diameter of first pipe is less than the diameter of second pipe, when filter section is blocked, second piston slides in second pipe and approaches well pipe and drives first piston to slide away from well pipe in first pipe;Sleeve pipe is slidably arranged in well pipe and first pipe and is slidably connected with first piston, for blocking water outlet when first piston is away from well pipe;Energy storage component is used to provide the power of reset for first piston and second piston;Impact component is used to make communicating pipe communicated with reservoir when sleeve pipe blocks water outlet;Trigger component is used to fix the position of second piston and sleeve pipe when water outlet is blocked and cancel the restriction to the position of second piston and sleeve pipe after first piston resets;Vacuum mechanism is used to extract water in well pipe from water outlet and discharge into reservoir, and make energy storage component store energy when filter section is blocked.

2. The apparatus according to claim 1, wherein First piston includes first pull rod and first slide column, first pull rod penetrates first pipe and is slidably connected with first pipe along the axial direction of first pipe, and first pipe is coaxial with well pipe;First slide column is installed on the end of first pull rod close to well pipe, sleeve pipe is sleeved on first slide column and is slidably connected with first pipe and first slide column respectively;First slide column can abut against sleeve pipe when first slide column is away from well pipe, and first slide column and sleeve pipe divide first pipe into two chambers arranged in vertical direction and isolated from each other.

3. The apparatus according to claim 2, wherein Second piston includes second pull rod and second slide column, second pull rod penetrates second pipe and is slidably connected with second pipe along the axial direction of second pipe, second slide column is installed on the end of second pull rod close to well pipe and can divide second pipe into two chambers arranged in the axial direction of second pipe, wherein one chamber away from well pipe is communicated with one chamber away from well pipe in first pipe through communicating pipe between first pipe and second pipe.

4. The apparatus according to claim 3, wherein Energy storage component includes first spring and second spring, first spring is sleeved on first pull rod and connected with first pipe and first slide column, and second spring is sleeved on second pull rod and connected with second pipe and second pull rod.

5. The apparatus according to claim 3, wherein One end of first pull rod outside first pipe and one end of second pull rod outside second pipe are both provided with positioning block for limiting the position of first slide column and second slide column respectively.

6. The apparatus according to claim 3, wherein Impact component includes slide sleeve and third spring, slide sleeve is sleeved on second pull rod and is slidably connected with second pull rod, second pipe is provided with interface, communicating pipe is connected with second pipe through interface, slide sleeve is located in second pipe and is located on the side of interface away from second slide column, third spring is sleeved on second pull rod and connected with second slide column and slide sleeve;Second pipe is provided with stop ring, slide sleeve is located between second slide column and stop ring, and slide sleeve can be clamped with stop ring and divide the chamber away from well pipe in second pipe into two small chambers which can be isolated from each other, second pipe is provided with water suction pipe connected with reservoir, and water suction pipe is located on the side of stop ring away from communicating pipe.

7. The apparatus according to claim 3, wherein The sleeve is provided with a second hole and a third hole, the second hole is above the third hole, the first slide column is provided with a stopper on the peripheral surface, the stopper is slidingly arranged in the second hole, and the stopper is slidingly connected with the sleeve and the first pipe; when the first slide column is in the initial position, the stopper is in the first pipe; the trigger assembly comprises a top rod, a spring sheet and a fourth spring, the top rod is slidingly arranged on the second slide column in the axial direction of the second pipe, the spring sheet is arranged on the peripheral surface of the top rod in an inclined manner, the spring sheet gradually approaches the second pull rod from the side close to the top rod to the side away from the top rod, the top rod is slidingly arranged in the third hole when the water outlet is blocked and is clamped through the spring sheet and the sleeve, the second pipe is located between the first pipe and the well pipe, and the first slide column can abut against the spring sheet when being reset; the fourth spring is sleeved on the top rod and connected with the top rod and the second slide column.

8. The apparatus according to claim 7, wherein The upper end of the well pipe is provided with an expansion pipe, the first pipe and the second pipe are connected with the expansion pipe and communicate with the well pipe through the expansion pipe, and the cross-sectional dimension of the expansion pipe is larger than the cross-sectional dimension of the first pipe and the second pipe.

9. The apparatus according to claim 1, wherein The vacuum mechanism comprises a vacuum pump and a main pipe, the vacuum pump is connected with the main pipe, and the pipeline mechanism is provided with a plurality of well pipes, each well pipe in the pipeline mechanism communicates with the main pipe through the water outlet thereon.

10. A vacuum dewatering process of a muddy silt layer using the muddy silt layer vacuum dewatering apparatus according to any one of claims 1 to 9, characterized by, The steps are as follows: S1, digging a well point and digging a water storage pool near the well point; S2, placing the end of the well pipe provided with the water filtering section into the well point, and filling water in the part where the first pipe and the second pipe communicate; S3, installing the vacuum mechanism, the vacuum mechanism draws water in the well pipe through negative pressure; S4, if the water filtering section is blocked, the vacuum mechanism continues to draw water in the well pipe, so that the internal pressure of the well pipe continuously decreases; the second piston is close to the well pipe under the influence of the suction force of the vacuum mechanism and drives the first piston to move away from the well pipe through the water in the communication pipe, and the energy storage assembly stores energy; S5, the sleeve blocks the water outlet, and the trigger assembly limits the position of the sleeve; S6, the impact assembly is started to make the communication pipe communicate with the water storage pool, and the energy storage assembly releases energy; S7, the first piston is reset, the internal pressure of the well pipe increases, and the water in the well pipe is discharged from the water filtering section to backflush the water filtering section; S8, the first piston is reset to promote the second piston to be reset under the action of the energy storage assembly through the trigger assembly, and the sleeve is reset.

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