External supporting type net-shaped drainage device and using method thereof

Abstract

The invention discloses an external supporting type net-shaped drainage device and a using method thereof, and relates to the technical field of foundation treatment and consolidation. A plurality of water absorption holes are formed in the side walls of the drainage branch pipes; through holes are formed in the side wall of the drainage main pipe, a scraping structure is fixedly arranged on each through hole, the drainage branch pipes, the through holes and the scraping structures are in one-to-one correspondence, and the drainage branch pipes penetrate through the corresponding scraping structures; the scraping structure is used for scraping sludge on the outer wall of the drainage branch pipe; and the drawing and inserting mechanism is used for driving the drainage branch pipe to reciprocate relative to the scraping structure. The method comprises the steps that in the negative pressure drainage process, after every set time, the drainage branch pipes are inserted into the drainage main pipe through the drawing and inserting mechanisms, and sludge on the outer walls of the drainage branch pipes is scraped away through the scraping structures. Sludge on the outer wall of the drainage branch pipe can be scraped off, and the drainage efficiency of a dredger fill foundation is improved.

Description

Technical Field

[0001] This invention relates to the field of foundation treatment and consolidation technology, and in particular to an externally supported mesh drainage device and its usage method. Background Technology

[0002] Hydraulic fill is a type of artificial fill, primarily used for dredging or leveling river channels or for industrial and agricultural purposes. It involves using high-pressure mud pumps to pump dredged mud and sand from dredgers through pipes to the areas requiring elevation and mud accumulation zones. After sedimentation, the dredged material is discharged, forming large areas of artificial fill. Its formation results in unique engineering characteristics: uneven composition, poor permeability, difficulty in drainage and consolidation, significant underconsolidation, high compressibility, low bearing capacity, and a tendency for surface subsidence. These characteristics make hydraulic fill foundations prone to excessive foundation settlement, differential settlement, and foundation pit instability during construction, necessitating consolidation and drainage treatment to meet building foundation requirements.

[0003] Currently, the mature method for reinforcing dredged fill soil is vacuum preloading. The general construction steps are: inserting plastic drainage boards – laying filter pipes – laying an upper sand cushion layer – laying a PVC film – constructing a sealing trench – installing a vacuum pump – vacuum preloading to consolidate the soil layer. However, while plastic drainage boards are suitable for foundation treatment in projects with thick silt layers, they do not solve the problem of gradual clogging and drainage failure during the drainage process. Furthermore, comparing the changes in the permeability coefficient of the filter membrane before and after clogging tests reveals that the permeability coefficient of the vacuum-sealed filter membrane decreases significantly after clogging, and the smaller the equivalent pore size of the filter membrane, the more severe the clogging. Therefore, the drainage scheme combining plastic drainage boards and vacuum filter membranes, due to its structural defects and susceptibility to clogging, is difficult to meet the requirements of high efficiency and durability in dredged fill soil foundation treatment. Summary of the Invention

[0004] The purpose of this invention is to provide an externally supported mesh drainage device and its usage method to solve the problems existing in the prior art and improve the drainage efficiency of dredged and filled soil foundations.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides an externally supported mesh drainage device, comprising: Vertically installed drainage main; Several drainage branch pipes are provided, and multiple water suction holes are provided on the side walls of the drainage branch pipes; through holes are provided on the side walls of the main drainage pipe, and a scraping structure is fixed on each through hole. The drainage branch pipes, the through holes and the scraping structures are in one-to-one correspondence, and the drainage branch pipes pass through the corresponding scraping structures; the scraping structures are used to scrape off the silt on the outer wall of the drainage branch pipes. A pull-in mechanism is used to drive the drainage pipe to reciprocate relative to the scraping structure.

[0006] Preferably, the insertion / removal mechanism includes an external pull rope, two slide rails, and several actuating components; the top end of the external pull rope is fixedly connected to the top end of the main drain pipe, and the two slide rails are vertically and parallel to each other and fixedly installed on the outer wall of the main drain pipe; each actuating component includes a mesh plate, a support rod, a slide rod, and a spring arranged sequentially from bottom to top, the bottom end of the mesh plate is hinged to the two slide rails respectively, one end of the support rod is hinged to the top end of the mesh plate and the other end is hinged to the slide rod, the slide rod slides with the two slide rails and is fixedly connected to the external pull rope, the bottom end of the spring is fixedly connected to the slide rod and the top end is fixedly connected to the slide rail, when the mesh plate is vertical, the spring is in a compressed state, and the compressed spring can drive the mesh plate to rotate relative to the slide rails until the mesh plate is perpendicular or inclined to the slide rod; Each mesh panel corresponds to several drainage branch pipes, and one end of each drainage branch pipe located outside the main drainage pipe is fixedly connected to the corresponding mesh panel.

[0007] Preferably, the different execution components are spaced apart along the vertical direction.

[0008] Preferably, each of the actuating components has two of the support rods and two of the springs; the springs correspond one-to-one with the slide rails, and the springs are disposed within the corresponding slide rails.

[0009] Preferably, each mesh panel corresponds to multiple drainage pipes, and all the drainage pipes corresponding to each mesh panel are divided into several layers along the vertical direction.

[0010] Preferably, each layer of the drainage pipes includes a plurality of drainage pipes spaced apart in a horizontal direction.

[0011] Preferably, the scraping structure uses a rubber ring, the outer ring of which is fixedly connected to the edge of the corresponding through hole, and the inner ring of which is tightly fitted to the outer wall of the corresponding drain pipe.

[0012] Preferably, an inner pull rope is fixedly installed inside the main drainage pipe, and one end of each drainage branch pipe located inside the main drainage pipe is fixedly connected to the inner pull rope.

[0013] Preferably, a clamp is fixedly provided at the top of the main drain pipe, and the top ends of the inner pull rope and the outer pull rope are respectively fixedly connected to the clamp.

[0014] The present invention also provides a method for using the above-mentioned externally supported mesh drainage device: after the externally supported mesh drainage device is installed, it is inserted into the soil layer at the location requiring drainage using a plate inserter; then, the drainage branch pipe is pulled out using the insertion and extraction mechanism, and then a vacuum is drawn in the main drainage pipe for negative pressure drainage; during the negative pressure drainage process, at set intervals, the drainage branch pipe is inserted into the main drainage pipe using the insertion and extraction mechanism to scrape off the silt on the outer wall of the drainage branch pipe using the scraping structure, and then the drainage branch pipe is pulled out using the insertion and extraction mechanism, and then a vacuum is drawn in the main drainage pipe for negative pressure drainage.

[0015] The present invention achieves the following technical effects compared to the prior art: The externally supported mesh drainage device and its usage method of the present invention, during use, drive the drainage branch pipe to reciprocate relative to the scraping structure through the insertion and withdrawal mechanism, which enables the scraping structure to scrape off the silt on the outer wall of the drainage branch pipe, thereby avoiding the problem of silt clogging the water inlet hole on the drainage branch pipe during long-term drainage, and improving the drainage efficiency of the dredged soil foundation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a side view of each drainage pipe in the externally supported mesh drainage device of the present invention after it has been pulled out. Figure 2 This is a front view of each drainage pipe in the externally supported mesh drainage device of the present invention after it has been pulled out. Figure 3 This is a side view of the externally supported mesh drainage device of the present invention after each drainage branch pipe is inserted into the main drainage pipe; In the diagram: 1. Main drain pipe; 2. Spring; 3. Slide rail; 4. Branch drain pipe; 5. Mesh panel; 6. Support rod; 7. Inner pull rope; 8. Outer pull rope; 9. First hinge point; 10. Slide rod; 11. Rubber ring; 12. Clamp. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The purpose of this invention is to provide an externally supported mesh drainage device and its usage method to solve the problems existing in the prior art and improve the drainage efficiency of dredged and filled soil foundations.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1 like Figures 1 to 3 As shown, this embodiment provides an externally supported mesh drainage device, including: Vertically installed main drainage pipe 1; Several drainage branch pipes 4 are provided, and multiple water suction holes are provided on the side wall of the drainage branch pipes 4; through holes are provided on the side wall of the main drainage pipe 1, and a scraping structure is fixed on each through hole. The drainage branch pipes 4, through holes and scraping structures are in one-to-one correspondence, and the drainage branch pipes 4 pass through the corresponding scraping structures; the scraping structures are used to scrape the silt on the outer wall of the drainage branch pipes 4. The insertion and withdrawal mechanism is used to drive the reciprocating motion of the drainage pipe 4 relative to the scraping structure.

[0022] In this embodiment, the drainage pipe 4 can be driven to reciprocate relative to the scraping structure through the insertion and withdrawal mechanism during use. This allows the scraping structure to scrape off the silt on the outer wall of the drainage pipe 4, thereby avoiding the problem of silt clogging the water inlet hole on the drainage pipe 4 during long-term drainage and improving the drainage efficiency of the dredged soil foundation.

[0023] In this embodiment, the specific structure of the insertion / removal mechanism is as follows: The insertion / removal mechanism includes an external pull rope 8, two slide rails 3, and several actuators. The top end of the external pull rope 8 is fixedly connected to the top end of the main drain pipe 1. The two slide rails 3 are vertically and parallel to each other and fixedly installed on the outer wall of the main drain pipe 1. Each actuator includes a mesh plate 5, a support rod 6, a slide rod 10, and a spring 2 arranged sequentially from bottom to top. The bottom end of the mesh plate 5 is hinged to the two slide rails 3 respectively. One end of the support rod 6 is hinged to the top end of the mesh plate 5, and the other end is hinged to the slide rod 10. The slide rod 10 is connected to the two slide rails. 3. The spring 2 is fixedly connected to the slide rod 10 at the bottom and to the slide rail 3 at the top. When the mesh plate 5 is vertical, the spring 2 is in a compressed state, and the compressed spring 2 can drive the mesh plate 5 to rotate relative to the slide rail 3 until the mesh plate 5 is tilted to the slide rod 10. The maximum tilt of the mesh plate 5 is determined according to actual needs, and the mesh plate 5 can also be made perpendicular to the slide rod 10. The hinge point between the support rod 6 and the top of the mesh plate 5 is the first hinge point 9 in the figure. Each mesh panel 5 corresponds to several drainage branch pipes 4. The end of the drainage branch pipe 4 located outside the main drainage pipe 1 is fixedly connected to the corresponding mesh panel 5. Specifically, it can be connected at the intersection of the horizontal and vertical bars of the mesh panel 5.

[0024] In one optional embodiment, it is more preferred that different execution components are distributed at intervals along the vertical direction to facilitate the driving of multiple drainage pipes 4 at different heights.

[0025] In one optional embodiment, more preferably, each actuating component has two support rods 6 and two springs 2; the springs 2 correspond one-to-one with the slide rails 3, and the springs 2 are disposed in the corresponding slide rails 3.

[0026] In one optional embodiment, preferably, each mesh panel 5 corresponds to multiple drainage branches 4, and all drainage branches 4 corresponding to each mesh panel 5 are divided into three layers along the vertical direction. Further, each layer of drainage branches 4 includes two drainage branches 4 spaced apart along the horizontal direction.

[0027] In one optional embodiment, a preferred method is to use a rubber ring 11 as the scraping structure. The outer ring of the rubber ring 11 is fixedly connected to the edge of the corresponding through hole, and the inner ring of the rubber ring 11 is tightly fitted to the outer wall of the corresponding drain pipe 4. The type of scraping structure is not limited to the rubber ring 11 described above. In practical applications, other forms of scraping structures can also be used, such as annular scrapers, as long as it can ensure that the scraping structure can effectively scrape off the sludge on the drain pipe 4 when it reciprocates relative to the scraping structure.

[0028] In one optional embodiment, a preferred embodiment is that an inner pull rope 7 is fixedly installed inside the main drainage pipe 1, and one end of each drainage branch pipe 4 located inside the main drainage pipe 1 is fixedly connected to the inner pull rope 7; the inner pull rope 7 is provided with nodes corresponding to each drainage branch pipe 4 on each floor, and each drainage branch pipe 4 on each floor is connected to the corresponding node.

[0029] In one optional embodiment, more preferably, a clamp 12 is fixedly provided at the top of the drainage main pipe 1, and the top of the inner pull rope 7 and the top of the outer pull rope 8 are respectively fixedly connected to the clamp 12. The clamp 12 is provided to facilitate the fixing of the outer pull rope 8 after manual pulling, so that the operator does not have to hold the outer pull rope 8 by hand all the time, thus reducing the labor intensity of the operator.

[0030] It is worth noting that the specific structure of the insertion and withdrawal mechanism is not limited to the specific structure described in this embodiment. In practical applications, other types of driving devices can also be used as the insertion and withdrawal mechanism. For example, hydraulic cylinders, air cylinders, or linear motors can be used to drive the reciprocating motion of the drainage pipe 4. However, it should be noted that when setting these driving devices, waterproofing work should be done to prevent water in the soil from seeping into the driving device and causing damage to the driving device.

[0031] Example 2 This embodiment provides a method for using the externally supported mesh drainage device of Embodiment 1, as detailed below: Install the externally supported mesh drainage device and ensure that each drainage branch pipe 4 is inserted into the main drainage pipe 1. This reduces the resistance when the externally supported mesh drainage device is inserted into the soil. Then, insert the externally supported mesh drainage device into the soil at the location where drainage is needed using an inserter. Then, pull out the drainage branch pipe 4 using a pull-out mechanism. Subsequently, vacuum is drawn in the main drainage pipe 1 for negative pressure drainage. During the negative pressure drainage process, after each set time interval (the set time needs to be determined by the on-site staff based on the actual situation), insert the drainage branch pipe 4 into the main drainage pipe 1 using the pull-out mechanism to scrape off the silt on the outer wall of the drainage branch pipe 4 using a scraping structure. Then, pull out the drainage branch pipe 4 using the pull-out mechanism. Subsequently, vacuum is drawn in the main drainage pipe 1 for negative pressure drainage.

[0032] In this embodiment, the specific operation steps to ensure that each drainage branch pipe 4 is in the state of being inserted into the main drainage pipe 1 are as follows: Pull the slide bar 10 in each actuator upward to the upper position using the external pull rope 8, and then fix the external pull rope 8 with the clamp 12. At this time, the spring 2 is in a compressed state, and the slide bar 10 drives the mesh plate 5 to retract and make the mesh plate 5 in a vertical state.

[0033] In this embodiment, the specific steps for pulling out the drain pipe 4 using the insertion and extraction mechanism are as follows: Release clamp 12 and loosen pull rope 8. Under the push of spring 2, the support rods 6 at each section gradually push the mesh plate 5 outward until the outer end of the mesh plate 5 reaches its maximum supported state. At the same time, the drainage branch pipe 4 connected to the mesh plate 5 moves outward relative to the rubber ring 11 and is pulled out of the main drainage pipe 1, making contact with the external soil. It is worth noting that since this embodiment is applied to the drainage of dredged soil foundation, and the strength of dredged soil is relatively low, it is possible for the mesh plate 5 to overcome the resistance of the soil layer and be externally supported in the above process, provided that the elastic force of spring 2 is sufficient.

[0034] In this embodiment, the specific steps for inserting the drainage branch pipe 4 into the main drainage pipe 1 via the insertion and removal mechanism to scrape away the silt from the structure are as follows: Tighten the outer pull rope 8 to retract the mesh plate 5 and bring it close to the main drainage pipe 1 again. At the same time, tighten the inner pull rope 7 to make the drainage branch pipe 4 pass through the rubber ring 11 to scrape off the silt on the drainage branch pipe 4 and make the drainage branch pipe 4 retract into the main drainage pipe 1.

[0035] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An externally supported mesh drainage device, characterized in that, include: Vertically installed drainage main; Several drainage branch pipes are provided, and multiple water suction holes are provided on the side walls of the drainage branch pipes; through holes are provided on the side walls of the main drainage pipe, and a scraping structure is fixed on each through hole. The drainage branch pipes, the through holes and the scraping structures are in one-to-one correspondence, and the drainage branch pipes pass through the corresponding scraping structures; the scraping structures are used to scrape off the silt on the outer wall of the drainage branch pipes. A pull-in mechanism is used to drive the drainage pipe to reciprocate relative to the scraping structure.

2. The externally supported mesh drainage device according to claim 1, characterized in that: The insertion / removal mechanism includes an external pull rope, two slide rails, and several actuating components. The top end of the external pull rope is fixedly connected to the top end of the main drain pipe. The two slide rails are vertically and parallel to each other and fixedly installed on the outer wall of the main drain pipe. Each actuating component includes a mesh plate, a support rod, a slide rod, and a spring arranged sequentially from bottom to top. The bottom end of the mesh plate is hinged to the two slide rails. One end of the support rod is hinged to the top end of the mesh plate and the other end is hinged to the slide rod. The slide rod slides with the two slide rails and is fixedly connected to the external pull rope. The bottom end of the spring is fixedly connected to the slide rod and the top end is fixedly connected to the slide rail. When the mesh plate is vertical, the spring is in a compressed state, and the compressed spring can drive the mesh plate to rotate relative to the slide rails until the mesh plate is perpendicular to or inclined to the slide rod. Each mesh panel corresponds to several drainage branch pipes, and one end of each drainage branch pipe located outside the main drainage pipe is fixedly connected to the corresponding mesh panel.

3. The externally supported mesh drainage device according to claim 2, characterized in that: The different execution components are distributed at intervals along the vertical direction.

4. The externally supported mesh drainage device according to claim 2, characterized in that: Each of the aforementioned actuators has two of the aforementioned struts and two of the aforementioned springs; each spring corresponds to a slide rail and is disposed within the corresponding slide rail.

5. The externally supported mesh drainage device according to claim 2, characterized in that: Each mesh panel corresponds to multiple drainage pipes, and all the drainage pipes corresponding to each mesh panel are divided into several layers along the vertical direction.

6. The externally supported mesh drainage device according to claim 5, characterized in that: Each floor's drainage branch pipes include several drainage branch pipes spaced apart in a horizontal direction.

7. The externally supported mesh drainage device according to claim 1, characterized in that: The scraping structure uses a rubber ring, the outer ring of which is fixedly connected to the edge of the corresponding through hole, and the inner ring of which is tightly fitted to the outer wall of the corresponding drain pipe.

8. The externally supported mesh drainage device according to claim 2, characterized in that: An internal pull rope is fixedly installed inside the main drainage pipe, and one end of each of the drainage branch pipes located inside the main drainage pipe is fixedly connected to the internal pull rope.

9. The externally supported mesh drainage device according to claim 8, characterized in that: A clamp is fixedly installed at the top of the main drainage pipe, and the top ends of the inner pull rope and the outer pull rope are respectively fixedly connected to the clamp.

10. A method of using the externally supported mesh drainage device according to any one of claims 1-9, characterized in that: After the externally supported mesh drainage device is installed, it is inserted into the soil layer at the location requiring drainage using a plate inserter. Then, the drainage branch pipe is pulled out using the extraction and insertion mechanism, and a vacuum is drawn in the main drainage pipe for negative pressure drainage. During the negative pressure drainage process, at set intervals, the drainage branch pipe is inserted into the main drainage pipe using the extraction and insertion mechanism to scrape off the silt on the outer wall of the drainage branch pipe using the scraping structure. Then, the drainage branch pipe is pulled out again using the extraction and insertion mechanism, and a vacuum is drawn in the main drainage pipe for negative pressure drainage.

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