Tesla valve type drain board and its manufacturing method and application

Abstract

The invention discloses a Tesla valve type drain plate, comprising an air source device, the air source device is connected to the drain plate core through an air source gas transmission pipe and a flow divider, the drain plate core and the filter membrane form a complex, the outer wall surfaces on both sides of the drain plate core form drain grooves, the drain plate core is vertically arranged with a Tesla valve corresponding to the drain groove, the drain groove bottom is asymmetrically opened, the top of the Tesla valve is provided with an air inlet, the Tesla valve is an air guide channel inside, the air guide channel is provided with a wind hole on the outer wall, the wind hole is connected to one end of a branch pipe with an inverted membrane, and the other end of the branch pipe is bonded to the hole at the bottom of the drain groove. The airflow enters forward from the Tesla valve, is accelerated by the Tesla valve, and is ejected from the copolypropylene branch pipe port with an inverted membrane; the accelerated ejected airflow acts on the soil particles and the filter membrane that block the drain groove through the asymmetrical small holes on the drain plate, has a driving effect on the soft clay particles on the drain plate, and solves the problem that the filter membrane is weak in the ability to resist lateral pressure and is prone to depression at each drain groove.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, and in particular to a Tesla valve type drain plate and a manufacturing method and application thereof. Background Art

[0002] Drainage boards for soft foundation consolidation treatment have been widely used in soft soil foundation treatment and land reclamation projects. However, during the construction process, the insertion operation of the plugging machine sometimes causes the filter membrane and the drainage board to be partially separated, and the soft soil is easy to enter the drainage board core from the separation area, thereby blocking the board core. Secondly, the filter membrane is simply wrapped on the surface of the drainage wrench core, and the tension of the filter membrane is poor, so the filter membrane has weak lateral pressure resistance and is easy to produce depressions in each drainage groove. The depression of the filter membrane will cause the water flow of the drainage board to decrease, affecting the silt consolidation speed and effect. Finally, the soft soil particles are extremely fine and highly viscous. Small particles can easily gather near the vertical drainage board with the seepage of pore water and form a harder silt layer on the surface, resulting in serious clogging of the drainage board, resulting in low efficiency and unclear treatment effect in the later stage. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a Tesla valve type drain board with simple structure, safety and reliability, and provides a manufacturing method thereof and its application in strengthening soft foundations.

[0004] The technical solution of the present invention to solve the above problems is: a Tesla valve type drain board, comprising an air source device, a Tesla valve, a branch pipe, a drain board core, and a filter membrane, wherein the air source device is connected to the inlets of multiple diverters through an air source air pipeline, and the outlet of each diverter is connected to a drain board core, a filter membrane is arranged on the outside of the drain board core, and the drain board core and the filter membrane form a complex, and a plurality of partitions are arranged on the outer wall surfaces on both sides of the drain board core to form a plurality of drainage grooves, and a Tesla valve is vertically arranged inside the drain board core corresponding to each drainage groove, and asymmetrical holes are opened at the bottom of each drainage groove on both sides of the drain board core, an air inlet is arranged on the top of the Tesla valve, the interior of the Tesla valve is an air guide channel, and an air hole is opened on the outer wall of the air guide channel, the air hole is connected to one end of the branch pipe with an inverted membrane, and the other end of the branch pipe is bonded to the hole at the bottom of the drainage groove by hot melt adhesive; the air source device intermittently supplies air to the Tesla valve through the air source air pipeline and the diverter, and the airflow enters from the air inlet of the Tesla valve and is ejected from the branch pipe along the air guide path.

[0005] The above-mentioned Tesla valve type drain plate, the air guide channel inside the Tesla valve includes a straight channel and an oblique channel, the top of the straight channel is connected to the air inlet, and single wings are staggered on both sides of the straight channel from top to bottom to form an oblique channel through the single wings, and the straight channel and the oblique channel have a 30° diversion angle.

[0006] The Tesla valve type drain board mentioned above, the drain board core plate is made of a mixture of polypropylene and polyethylene, the filter membrane is made of long-fiber hot-rolled non-woven fabric, and the Tesla valve and branch pipe are made of co-polypropylene.

[0007] The above-mentioned Tesla valve type drain board, the diameter of the straight channel and the inclined channel is 0.3 cm, the diameter of the Tesla valve air inlet is 0.3 cm, the width of the single wing is 0.5 cm, the length of the branch pipe is 0.7 cm, and the diameter of the outer wall hole of the drain board core is 0.3 cm.

[0008] The Tesla valve type drain plate has an air hole extending 5-10 cm downward from the bottom of each single wing of the Tesla valve, and the air hole is inclined upward at 45°, with a diameter of 0.3 cm.

[0009] The Tesla valve type drain board mentioned above has a check valve provided on the gas source gas supply pipe.

[0010] A method for manufacturing a Tesla valve type drain board, characterized in that it comprises the following steps:

[0011] (1) Tesla valve molding:

[0012] Add the copolymerized polypropylene raw material into a hot melt machine to melt, the melting temperature is 150-176°C, the melting time is 8-10 minutes, and the melted copolymerized polypropylene is filtered through a screen filter, and the flow rate of the screen filter is not less than the flow rate of the melt metering booster pump;

[0013] An isolation film is laid in advance on the Tesla valve model mold. The diversion angle of the straight channel and the oblique channel in the Tesla valve model is 30°, the diameter of the straight channel and the oblique channel is 0.3 cm, the wall thickness is 1 mm, the single wing is 0.5 cm wide, each single wing extends 5-10 cm downward, and an air hole with an upward angle of 45° and a 0.3 cm opening is set on the outside of the extension section, and a branch pipe with a length of 0.7 cm is connected; the liquid copolypropylene is sent to the mold for molding through a melt metering booster pump, and the molded Tesla valve is placed at room temperature for cooling;

[0014] (2) Drainage board core molding:

[0015] The polypropylene and polyethylene are mixed and blended in a ratio of 6:4, and added to a hot melt machine to melt. The melting temperature is 132-135°C and the melting time is 8-10 minutes. The melted mixture is filtered through an automatic screen filter, and then sent to an extruder through a melt metering booster pump. The mixture extruded by the extruder passes through a hanger die head to form a sheet, and then is vacuum-adsorbed and formed by a drainage board rolling suction machine. The formed drainage board core is placed in normal temperature water to cool;

[0016] (3) Production of finished products:

[0017] Asymmetrical holes are opened on each drainage groove on both sides of the drainage board core, and a Tesla valve is vertically arranged at the corresponding position of each drainage groove. The air hole of the Tesla valve is connected to one end of the branch pipe with inverted film. The branch pipe with inverted film and the hole are hot-melt bonded. After the drainage board core and the Tesla valve skeleton are formed, the upper and lower ends of the molded skeleton are sealed with liquid co-polypropylene, and a Tesla valve air inlet is left at the upper end.

[0018] In the method for manufacturing the Tesla valve-type drain plate, in step (2), the extruder is a single-screw extruder, and the temperature of the feeding section, melting section, and metering section of the single screw is 135±3°C.

[0019] An application of a Tesla valve type drain board in strengthening a soft foundation, the application specifically includes the following steps:

[0020] 1. Site clearing and leveling: clearing vegetation, garbage, and obstacles within the construction area;

[0021] (II) Laying the sand cushion: The soft foundation treatment sand cushion is used as both the working cushion and the horizontal drainage cushion. Medium-coarse sand is required, with a particle size of 0.25~2.0mm and a permeability coefficient of not less than 5×10 -3 cm / s, mud content ≤5%, paving thickness of more than 200mm, manual or mechanical paving;

[0022] (III) Casting concrete pad: Casting concrete pad with a thickness of 10 cm to support the gas source device;

[0023] (IV) Install the gas source device: Place the gas source device on the concrete pad;

[0024] (V) Installing Tesla valve drain boards: Use a plate inserter to insert Tesla valve drain boards into the soft soil foundation, with an interval of 1m and a plum blossom shape. The board ends are installed to the bottom of the silt layer, with the upper end of the drain board exposed 10-15cm above the sand cushion layer, and the exposed part is bent downward. During the installation of Tesla valve drain boards, the number of back-drafts shall not exceed 5% of the total number of installations;

[0025] (VI) Drainage ditch construction: The size of the drainage ditch shall be determined according to the construction area;

[0026] (VII) Connect the gas source device and the drain plate: connect the gas source device and the diverter with a gas source gas pipeline, and adjust it through the check valve; the diverter diverts the gas into the Tesla valve inlet;

[0027] (VIII) Intermittent gas supply: The gas source device intermittently supplies gas to the Tesla valve through the gas source gas supply pipe and the diverter. The gas enters from the gas inlet of the Tesla valve and is ejected from the branch pipe along the gas guide path. During intermittent gas supply, the gas pressure is maintained at 0.4MPa.

[0028] The beneficial effects of the present invention are:

[0029] 1. The Tesla valve type drain board of the present invention utilizes the characteristics of the Tesla valve that it can accelerate the airflow in the forward direction and restrict the backflow in the reverse direction: the airflow enters from the Tesla valve in the forward direction, is accelerated by the Tesla valve, and is ejected from the outlet of the copolypropylene branch pipe with the inverted membrane; the accelerated airflow acts on the soil particles and filter membrane that block the drainage groove through the asymmetric small holes on the drain board. The present invention is designed to address the situation that the drain board is easily blocked due to small soft clay particles. The accelerated airflow ejected from the copolypropylene branch pipe plays two roles: one is to promote the soft clay particles on the drain board; the other is to solve the problem that the filter membrane is prone to depression at each drainage groove due to its weak lateral pressure resistance. The inverted membrane on the copolypropylene branch pipe can play the role of a human venous valve, which can ensure the one-way transportation of the airflow, prevent the backflow of water in the soil, and prevent soil particles from blocking the copolypropylene branch pipe and the Tesla valve. It is suitable for soft soil foundation engineering.

[0030] 2. The present invention uses Tesla valve type drain board to reinforce soft foundation, which can alleviate the problem that the drain board is easily blocked by small soft clay particles in the later stage. It is suitable for soft soil foundation projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a construction layout diagram of the Tesla valve type drain board of the present invention.

[0032] Figure 2 It is a three-dimensional schematic diagram of the Tesla valve type drain board of the present invention.

[0033] Figure 3 It is a cross-sectional schematic diagram of the Tesla valve type drain plate of the present invention.

[0034] Figure 4 The figure is a schematic diagram of the process of reinforcing soft foundation according to the present invention. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] like Figure 1-Figure 3 As shown, a Tesla valve type drain plate includes an air source device 1, a Tesla valve, a branch pipe 13, a drain plate core 8, and a filter membrane 9. The air source device 1 is placed on a concrete pad 2. The air source device 1 is connected to the inlets of multiple diverters 7 through an air source gas transmission pipe 4. The air source gas transmission pipe 4 is provided with a check valve 3. The outlet of each diverter 7 is connected to a drain plate core 8. Figure 1As shown, the diverter 7 and the drainage board core 8 are bonded with hot melt adhesive, and are in a stepped shape with a larger lower end and a lower upper end; a filter membrane 9 is provided on the outside of the drainage board core 8, and the drainage board core 8 and the filter membrane 9 form a complex. A number of partitions are arranged on the outer wall surfaces on both sides of the drainage board core 8 to form a plurality of drainage grooves. A Tesla valve is vertically arranged inside the drainage board core 8 corresponding to each drainage groove, and asymmetric holes 10 are opened at the bottom of each drainage groove on both sides of the drainage board core. An air inlet 11 is arranged on the top of the Tesla valve. The interior of the Tesla valve is an air guide channel, and an air hole is opened on the outer wall of the air guide channel. The air hole is connected to one end of a branch pipe 13 with an inverted membrane 14, and the other end of the branch pipe 13 is bonded to the hole 10 at the bottom of the drainage groove with hot melt adhesive; the air source device 1 intermittently supplies air to the Tesla valve through the air source air supply pipe 4 and the diverter 7, and the air flow enters from the Tesla valve air inlet 11 and is ejected from the branch pipe 13 along the air guide path. The inverted membrane 14 can ensure the one-way transmission of the airflow, prevent the water in the soil from flowing back, and prevent soil particles from blocking the branch pipe 13.

[0037] The air guide channel inside the Tesla valve includes a straight channel and an oblique channel. The top of the straight channel is connected to the air inlet 11. Single wings 12 are staggered on both sides of the straight channel from top to bottom to form an oblique channel. The straight channel and the oblique channel form a 30° diversion angle.

[0038] The drainage board core 8 is made of a mixture of polypropylene and polyethylene, the filter membrane 9 is made of long-fiber hot-rolled non-woven fabric, and the Tesla valve and branch pipe 13 are made of co-polypropylene.

[0039] The diameters of the straight channel and the oblique channel are 0.3 cm, the diameter of the Tesla valve air inlet 11 is 0.3 cm, the width of the single wing 12 is 0.5 cm, the length of the branch pipe 13 is 0.7 cm, and the diameter of the outer wall hole 10 of the drainage board core 8 is 0.3 cm.

[0040] A vent is provided 5-10 cm downward from the bottom of each single wing 12 of the Tesla valve, and the vent is inclined upward at 45°, with a diameter of 0.3 cm.

[0041] like Figure 3 As shown, small holes 10 with a diameter of 0.3 cm are opened on both sides of the drainage groove of the drainage board core 8, with an interval of 5-10 cm. The small holes on one side correspond to the branch pipe on the left side of the Tesla valve, and the small holes on the other side correspond to the branch pipe on the right side of the Tesla valve.

[0042] A method for manufacturing a Tesla valve type drain board, characterized in that it comprises the following steps:

[0043] (1) Tesla valve molding:

[0044] Add the copolymerized polypropylene raw material into a hot melt machine to melt, the melting temperature is 150-176°C, the melting time is 8-10 minutes, and the melted copolymerized polypropylene is filtered through a screen filter, and the flow rate of the screen filter is not less than the flow rate of the melt metering booster pump;

[0045] The Tesla valve model mold is pre-laid with an isolation film. The diversion angle of the straight channel and the oblique channel in the Tesla valve model is 30°, the diameter of the straight channel and the oblique channel is 0.3 cm, the wall thickness is 1 mm, the single wing 12 is 0.5 cm wide, each single wing 12 extends 5-10 cm downward, and a 0.3 cm air hole is set on the outer side of the extension section at an angle of 45° upward, and a branch pipe 13 with a length of 0.7 cm is connected; the liquid copolypropylene is sent to the mold for molding through a melt metering booster pump, and the molded Tesla valve is placed at room temperature for cooling;

[0046] (2) Forming of drainage board core 8:

[0047] Polypropylene and polyethylene are mixed and blended in a ratio of 6:4, added to a hot melt machine for melting, the melting temperature is 132-135°C, the melting time is 8-10 minutes, the melted mixture is filtered through an automatic screen filter, and then sent to an extruder through a melt metering booster pump. The extruder adopts a single-screw extruder, and the temperature of the feeding section, melting section, and metering section of the single screw is 135±3°C. The mixture extruded by the extruder passes through a hanger die head to form a sheet, and then is vacuum-adsorbed and formed by a drainage board rolling suction machine. The formed drainage board core 8 is placed in normal temperature water for cooling;

[0048] (3) Production of finished products:

[0049] Asymmetrical holes 10 are opened on both side plates of the drainage board core 8, and a Tesla valve is placed in each drainage groove of the drainage board core 8. The air hole of the Tesla valve is connected to one end of the branch pipe 13 with the inverted film 14. The branch pipe 13 with the inverted film 14 and the hole 10 are hot-melt bonded. After the drainage board core 8 and the Tesla valve skeleton are formed, the upper and lower ends of the molded skeleton are sealed with liquid co-polypropylene, and a Tesla valve air inlet 11 is left at the upper end.

[0050] like Figure 4 As shown, a sand cushion layer is horizontally drained and a Tesla valve-type drain board is vertically drained. Water in the bottom mud slowly enters the sand cushion layer through the pores, is discharged horizontally, and then drained vertically through the Tesla valve-type drain board. The pore volume slowly decreases, the foundation undergoes consolidation deformation, the effective stress gradually increases, and the strength of the foundation soil gradually increases. An application of a Tesla valve-type drain board in strengthening a weak foundation specifically includes the following steps:

[0051] 1. Site clearing and leveling: clearing vegetation, garbage, and obstacles within the construction area;

[0052] (II) Laying the sand cushion layer 5: The soft foundation treatment sand cushion layer 5 serves as both the working cushion layer and the horizontal drainage cushion layer. Medium-coarse sand with a particle size of 0.25-2.0 mm and a permeability coefficient of not less than 5×10 -3cm / s, mud content ≤5%, paving thickness of more than 200mm, manual or mechanical paving is adopted according to the size of the construction area;

[0053] (III) Casting concrete pad 2: Cast concrete pad 2 according to the bottom area of ​​air source device 1. The thickness of concrete pad 2 is 10 cm so as to support air source device 1.

[0054] (IV) Setting up the air source device 1: placing the air source device 1 on the concrete pad 2;

[0055] (V) Installing Tesla valve-type drain boards: Use a plate inserter to insert Tesla valve-type drain boards into the soft soil foundation, with an interval of 1m and a plum blossom shape. The board ends are installed to the bottom of the silt layer, with the upper end of the drain board exposed 510-15cm above the sand cushion layer, and the exposed part is bent downward. During the installation of Tesla valve-type drain boards, the number of back-drafts shall not exceed 5% of the total number of installations;

[0056] (VI) Construction of drainage ditch 6: The size of drainage ditch 6 is determined according to the construction area;

[0057] (VII) Connecting the gas source device 1 and the drain plate: Connect the gas source device 1 and the diverter 7 with the gas source gas pipe 4, and adjust it through the check valve 3; the diverter 7 diverts the gas into the Tesla valve inlet 11;

[0058] (VIII) Intermittent gas supply: The gas source device 1 intermittently supplies gas to the Tesla valve through the gas source gas supply pipe 4 and the diverter 7. The gas enters from the Tesla valve air inlet 11 and is ejected from the branch pipe 13 along the gas guide path. During intermittent gas supply, the gas pressure is maintained at 0.4 MPa.

Claims

1. A Tesla valve type drain board, characterized in that: It includes an air source device, a Tesla valve, a branch pipe, a drainage board core, and a filter membrane. The air source device is connected to the inlets of multiple diverters through an air source air pipeline, and the outlet of each diverter is connected to a drainage board core. A filter membrane is arranged on the outside of the drainage board core. The drainage board core and the filter membrane form a complex. A plurality of partitions are arranged on the outer wall surfaces of both sides of the drainage board core to form multiple drainage grooves. A Tesla valve is vertically arranged inside the drainage board core corresponding to each drainage groove. Asymmetrical holes are opened at the bottom of each drainage groove on both sides of the drainage board core. An air inlet is arranged on the top of the Tesla valve. The interior of the Tesla valve is an air guide channel. Wind holes are opened on the outer wall of the air guide channel. The wind holes are connected to one end of a branch pipe with an inverted membrane, and the other end of the branch pipe is bonded to the hole at the bottom of the drainage groove by hot melt adhesive. The air source device intermittently supplies air to the Tesla valve through the air source air pipeline and the diverter. The air flow enters from the air inlet of the Tesla valve and is ejected from the branch pipe along the air guide path. The air guide channel inside the Tesla valve includes a straight channel and an oblique channel. The top of the straight channel is connected to the air inlet. Single wings are staggered on both sides of the straight channel from top to bottom to form an oblique channel. The straight channel and the oblique channel form a 30° diversion angle. A stop control valve is arranged on the gas source gas transmission pipe.

2. The Tesla valve type drain plate according to claim 1, characterized in that: The core plate of the drainage board is made of a mixture of polypropylene and polyethylene, the filter membrane is made of long-fiber hot-rolled non-woven fabric, and the Tesla valve and branch pipe are made of co-polypropylene.

3. The Tesla valve type drain plate according to claim 2, characterized in that: The diameters of the straight channel and the oblique channel are 0.3 cm, the diameter of the Tesla valve air inlet is 0.3 cm, the width of the single wing is 0.5 cm, the length of the branch pipe is 0.7 cm, and the diameter of the hole on the outer wall of the drainage board core is 0.3 cm.

4. The Tesla valve type drain plate according to claim 3, characterized in that: A vent is provided 5-10 cm downward from the bottom of each single wing of the Tesla valve, and the vent is inclined upward at 45°, with a diameter of 0.3 cm.

5. A method for manufacturing the Tesla valve type drain board according to claim 4, characterized in that: The following steps are involved: (1) Tesla valve molding: Add the copolymerized polypropylene raw material into a hot melt machine to melt, the melting temperature is 150-176°C, the melting time is 8-10 minutes, and the melted copolymerized polypropylene is filtered through a screen filter, and the flow rate of the screen filter is not less than the flow rate of the melt metering booster pump; An isolation film is laid in advance on the Tesla valve model mold. The diversion angle of the straight channel and the oblique channel in the Tesla valve model is 30°, the diameter of the straight channel and the oblique channel is 0.3 cm, the wall thickness is 1 mm, the single wing is 0.5 cm wide, each single wing extends 5-10 cm downward, and an air hole with an upward angle of 45° and a 0.3 cm opening is set on the outside of the extension section, and a branch pipe with a length of 0.7 cm is connected; the liquid copolypropylene is sent to the mold for molding through a melt metering booster pump, and the molded Tesla valve is placed at room temperature for cooling; (2) Drainage board core molding: The polypropylene and polyethylene are mixed and blended in a ratio of 6:4, and added to a hot melt machine to melt. The melting temperature is 132-135°C and the melting time is 8-10 minutes. The melted mixture is filtered through an automatic screen filter, and then sent to an extruder through a melt metering booster pump. The mixture extruded by the extruder passes through a hanger die head to form a sheet, and then is vacuum-adsorbed and formed by a drainage board rolling suction machine. The formed drainage board core is placed in normal temperature water to cool; (3) Production of finished products: Asymmetrical holes are opened on each drainage groove on both sides of the drainage board core, and a Tesla valve is vertically arranged at the corresponding position of each drainage groove. The air hole of the Tesla valve is connected to one end of the branch pipe with inverted film. The branch pipe with inverted film and the hole are hot-melt bonded. After the drainage board core and the Tesla valve skeleton are formed, the upper and lower ends of the molded skeleton are sealed with liquid co-polypropylene, and a Tesla valve air inlet is left at the upper end.

6. The method for manufacturing the Tesla valve type drain board according to claim 5, characterized in that: In the step (2), the extruder is a single-screw extruder, and the temperature of the feeding section, melting section, and metering section of the single screw is 135±3°C.

7. An application of the Tesla valve type drain board according to claim 4 in strengthening a soft foundation, the application specifically comprising the following steps:

1. Site clearing and leveling: clearing vegetation, garbage, and obstacles within the construction area; (II) Laying the sand cushion: The soft foundation treatment sand cushion is used as both the working cushion and the horizontal drainage cushion. Medium-coarse sand with a particle size of 0.25-2.0 mm and a permeability coefficient of not less than 5×10 -3 cm / s, mud content ≤5%, paving thickness of more than 200mm, manual or mechanical paving; (III) Casting concrete pad: Casting concrete pad with a thickness of 10 cm to support the gas source device; (IV) Install the gas source device: Place the gas source device on the concrete pad; (V) Installing Tesla valve drain boards: Use a plate inserter to insert Tesla valve drain boards into the soft soil foundation, with an interval of 1m and a plum blossom shape. The board ends are installed to the bottom of the silt layer, with the upper end of the drain board exposed 10-15cm above the sand cushion layer, and the exposed part is bent downward. During the installation of Tesla valve drain boards, the number of back-drafts shall not exceed 5% of the total number of installations; (VI) Drainage ditch construction: The size of the drainage ditch shall be determined according to the construction area; (VII) Connect the gas source device and the drain plate: connect the gas source device and the diverter with a gas source gas pipeline, and adjust it through the check valve; the diverter diverts the gas into the Tesla valve inlet; (VIII) Intermittent gas supply: The gas source device intermittently supplies gas to the Tesla valve through the gas source gas supply pipe and the diverter. The gas enters from the gas inlet of the Tesla valve and is ejected from the branch pipe along the gas guide path. During intermittent gas supply, the gas pressure is maintained at 0.4MPa.

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