An electrolytic desaturation intelligent air-supplemented gravel pile and construction method

Abstract

The present invention discloses an electrolytic desaturation intelligent air-complemented gravel pile and a construction method, which includes an outer device and an inner device. The outer device includes a conductive grid and a saturation monitor. The saturation monitor is pre-fixed on the conductive grid. In the electrolytic circuit, the conductive grid is connected to the anode, and the saturation monitor is connected in series in the circuit. The inner device includes a conductive pipe and a conductive felt. A plurality of conductive felts are sleeved on the outer side of the conductive pipe at intervals along its length direction. In the electrolytic circuit, the conductive pipe is connected to the cathode. The present invention realizes the real-time monitoring and intelligence of the electrolytic desaturation process, and achieves the purpose of efficiently, uniformly and widely reducing the soil saturation degree. While rapidly draining water, the stability of bubbles is ensured. At the same time, the formed soil pile also introduces a good drainage channel for the nearby soil, greatly improving the foundation strength while also featuring short construction time, energy-saving economy, no pollution, long-term performance and intelligence.

Description

Technical Field

[0001] The present invention relates to a gas-supplemented gravel pile and a construction method, and particularly to an electrolytic desaturation intelligent gas-supplemented gravel pile and a construction method. Background Art

[0002] Earthquakes can trigger large-scale liquefaction of saturated sandy foundations, leading to the destruction of buildings, causing huge economic losses and casualties. Traditional anti-liquefaction measures are mainly divided into two categories: one is based on improving the properties of the soil, and the other is based on improving the stress-strain conditions of the liquefiable soil.

[0003] For example, existing sand compaction pile methods and electroosmotic drainage methods can increase the density of the soil. However, the sand compaction pile method has a high cost and cumbersome construction, and is not recommended for large-scale use; the electroosmotic drainage method utilizes the metal properties and its electroosmotic effect to drain the excess water in the foundation to prevent the foundation from collapsing. However, only considering the drainage aspect, it is easy to disturb the internal structure of the soil and form uneven settlement.

[0004] In recent years, new anti-liquefaction measures based on the electrolytic desaturation method have begun to be applied, that is, electrolyzing the soil to generate gas, discharging the water in the soil, reducing the saturation of the foundation, and thus improving the anti-liquefaction strength of the foundation. However, the existing electrolytic desaturation method has deficiencies, such as the subsequent stability problem that is difficult to handle by manual electrolysis, poor deep electrolysis effect, and small desaturation area formed by electrolysis. At present, the measures taken to address this problem are multiple electrolysis and increasing the current intensity to generate more bubbles. Although it can solve the problem to a certain extent, it still requires a lot of economic and energy consumption. Summary of the Invention

[0005] Object of the Invention: The object of the present invention is to provide an electrolytic desaturation intelligent gas-supplemented gravel pile and a construction method to uniformly electrolyze and desaturate and improve the soil strength.

[0006] Technical Solution: The present invention includes an outer device and an inner device. The outer device includes a conductive grid and a saturation monitor. The saturation monitor is pre-fixed on the conductive grid. In the electrolytic circuit, the conductive grid is connected to the anode, and the saturation monitor is connected in series in the circuit. The inner device includes a conductive tube and a conductive felt. A plurality of conductive felts are sleeved on the outer side of the conductive tube at intervals along its length direction. In the electrolytic circuit, the conductive tube is connected to the cathode.

[0007] The saturation monitor includes a humidity detector and an automatic switch.

[0008] When the saturation monitored by the saturation monitor exceeds the preset value, the automatic switch is turned on; when the saturation returns to the preset value, the automatic switch is turned off to disconnect the circuit, achieving intelligent electrolysis.

[0009] The conductive tube adopts a double-layer structure of an inner tube and an outer tube, including an inner tube and a conductive outer tube, and a water-permeable material is filled between the inner and outer tubes.

[0010] The surface of the conductive outer tube is perforated, and a non-woven fabric is laid on the inner side.

[0011] The inner tube is a flexible tube with micropores. After construction, the inner tube is connected to a pump, and gas is pumped in by a pneumatic pump to fill part of the pores of the water-permeable material between the inner and outer tubes, preventing small bubbles generated by electrolysis from escaping in large quantities through the drainage channel between the inner and outer tubes and not being able to gather in time to form large bubbles, thus maintaining stability.

[0012] The conductive felt is selected as graphite felt, and the graphite felt is wrapped by a geogrid.

[0013] A construction method for an electrolytic desaturation intelligent air-supplementing gravel pile includes the following steps:

[0014] (a) Level the site, measure the range where the electrolytic desaturation intelligent air-supplementing gravel pile needs to be placed, draw a layout plan, predetermine the drilling positions and bury the casing.

[0015] (b) Drill the hole and check whether the hole meets the requirements.

[0016] (c) After the above steps are completed, configure a counterweight foundation for the tubular conductive grid and assemble it into a whole.

[0017] (d) Sink the whole conductive grid into the predetermined hole.

[0018] (e) Sink the conductive tube into the predetermined hole and insert it into the hollow of the counterweight foundation to achieve a fixing effect.

[0019] (f) Push the graphite felt wrapped by a geogrid along the outer wall of the fixed conductive tube.

[0020] (g) After the above graphite felt sinks into the water surface, start backfilling to accelerate the sinking process.

[0021] (h) Repeat steps f and g, continue to install the remaining graphite felt until the backfilling is completed to form a complete pile.

[0022] (i) Connect the inner tube to a pump, fill part of the pores of the water-permeable material, then connect the corresponding wires of the conductive grid and the conductive tube to the anode and cathode respectively, and then the electrolysis device electrolyzes and drains water by itself.

[0023] (j) After the electrolysis stops, set a cushion layer on the top of the pile.

[0024] Beneficial effects: The present invention realizes the real-time monitoring and intelligentization of the electrolytic desaturation process, and achieves the purpose of efficiently, uniformly, and extensively reducing the soil saturation. While ensuring rapid drainage, it also guarantees the stability of the bubbles. At the same time, the formed soil piles also introduce good channels for the drainage of the nearby soil, greatly improving the foundation strength while also featuring short construction time, energy-saving, economic, pollution-free, long-lasting, and intelligent characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the overall schematic diagram of the device of the present invention;

[0026] Figure 2 is the schematic diagram of the peripheral device of the present invention;

[0027] Figure 3 is the schematic diagram of the internal device of the present invention;

[0028] Figure 4 is the enlarged view of the conductive tube of the present invention;

[0029] Figure 5 is the schematic diagram of the graphite felt of the present invention;

[0030] Figure 6 is the schematic diagram of the construction process of the present invention;

[0031] Figure 7 is the schematic diagram of the electrolytic desaturation principle of the present invention;

[0032] Figure 8 is the schematic diagram of the electrolytic desaturation principle of the prior art. DETAILED DESCRIPTION OF THE INVENTION

[0033] The present invention will be further described below with reference to the accompanying drawings.

[0034] As Figure 1 shown, the present invention includes a peripheral device and an internal device. The peripheral device includes a conductive grid 1 and a saturation monitor 2. The conductive grid 1 adopts a tubular structure. As Figure 2 shown, the saturation monitor 2 includes a humidity detector and an automatic switch. The saturation monitor 2 is pre-fixed on the conductive grid 1. In the electrolytic circuit, the conductive grid 1 is connected to the anode, and the saturation monitor 2 is connected in series in the circuit.

[0035] As Figure 3 shown, the internal device includes a conductive tube and a graphite felt 5. In the electrolytic circuit, the conductive tube is connected to the cathode. As Figure 4 shown, the conductive tube adopts a double-layer structure of an inner tube and an outer tube, including an inner tube 4 and a conductive outer tube 3. The surface of the conductive outer tube 3 is evenly perforated, and a non-woven fabric is laid on the inner side; the inner tube 4 is a flexible tube with micropores, and a water-permeable material is filled between the inner and outer tubes. After construction, the inner tube 4 is connected to an air pressure pump. A plurality of graphite felts 5 are arranged at intervals along the length direction of the conductive outer tube 3. AsFigure 5 As shown, each graphite felt 5 is wrapped by a geogrid.

[0036] The present invention can monitor the electrolytic desaturation in real time to achieve the purpose of energy conservation and intelligence. The special arrangement of its electrodes makes the bubbles generated in the soil efficient, uniform, and stable, and at the same time introduces a good drainage channel for the nearby soil body to drain water. In the electrolytic circuit, when the peripheral device is electrolyzed, it is connected to the anode, generating oxygen to reduce the saturation of the surrounding soil body, and at the same time attracting the water flow to flow towards the internal device; when the internal device is electrolyzed, it is connected to the cathode, and hydrogen is generated at the cathode, effectively reducing the saturation of the soil body at each depth.

[0037] Saturation S r =(ω*G s ) / e, where the moisture detector measures the water content ω, and Gs and e are the physical indexes measured by the in-situ soil laboratory test and the soil layer field test respectively: unit weight and void ratio. When in use, a preset saturation range is set. When the saturation exceeds the preset value, the automatic switch is turned on to connect the circuit; when the saturation returns to the preset value, the automatic switch is turned off to disconnect the circuit, achieving intelligent electrolysis. At the same time, the air pressure pump pumps in gas to fill some of the pores of the pervious material between the inner and outer pipes, preventing the small bubbles generated by electrolysis from escaping in large quantities through the drainage channel between the inner and outer pipes and not being able to gather in time to form large bubbles, maintaining stability.

[0038] As Figure 7 shown, when electrolyzed water generates bubbles and occupies the pores, the pore water is discharged; a non-woven fabric is laid on the inner wall of the outer pipe of the conductive pipe to prevent the loss of sand grains during the seepage process, and a pervious material is filled between the inner and outer pipes to provide a good drainage channel to achieve efficient drainage, and the water flow trend is in the shape of an inverted funnel.

[0039] As Figure 8 shown, vertical electrolysis (traditional electrolysis) does not set a drainage channel and conducts natural drainage, and the drainage condition is poor, especially it is difficult to drain water in the deep soil layer. Compared with vertical electrolysis, the desaturation area of the present invention increases, and the bubble distribution shows more bubbles around and fewer in the middle, and the bubbles in the area of the upper graphite felt and the surface of the conductive pipe often show the form of large bubbles.

[0040] A construction method of an electrolytic desaturation intelligent air-supplemented gravel pile includes the following steps:

[0041] (a) Level the site, measure the range where the electrolytic desaturation intelligent air-supplemented gravel pile needs to be placed, draw a layout plan, predetermine the drilling position and bury the casing;

[0042] (b) Move the drilling rig to the predetermined position, drill a hole, protect the borehole wall, clean the hole to form a hole passage, and check whether the hole passage meets the requirements;

[0043] (c) After the above steps are completed, configure a hollow cylindrical counterweight foundation for the tubular conductive grid and assemble it into a whole;

[0044] (d) Use a crane to sink the conductive grid as a whole into the predetermined duct;

[0045] (e) Then use a crane to sink the conductive pipe into the predetermined duct, and manually correct it when approaching the bottom to insert it into the hollow of the counterweight foundation to achieve the fixing effect;

[0046] (f) Push one of the graphite felts wrapped with geogrid along the outer wall of the fixed conductive pipe;

[0047] (g) After the graphite felt wrapped with geogrid sinks into the water surface, start backfilling soil and gravel to accelerate the sinking process;

[0048] (h) Repeat steps f and g, and continue to install the remaining graphite felts wrapped with geogrid until the backfilling is completed to form a complete gravel pile;

[0049] (i) Connect the inner pipe to an air pressure pump, fill some pores of the permeable material with appropriate gas, then connect the corresponding wires of the conductive grid and the conductive pipe to the anode and cathode of the DC power supply respectively, and then the electrolysis device electrolyzes and drains water by itself;

[0050] (j) After the electrolysis stops, set a cushion layer composed of gravel and geogrid on the top of the pile.

Claims

1. A construction method of an electrolytic desaturation intelligent air-complemented gravel pile, characterized in that Including an electrolytic desaturation intelligent air-supplementing gravel pile, the electrolytic desaturation intelligent air-supplementing gravel pile includes a peripheral device and an internal device. The peripheral device includes a conductive grid and a saturation monitor. The saturation monitor is pre-fixed on the conductive grid. In the electrolytic circuit, the conductive grid is connected to the anode, and the saturation monitor is connected in series in the circuit. The internal device includes a conductive tube and a conductive felt. A plurality of conductive felts are sleeved on the outer side of the conductive tube at intervals along its length direction. In the electrolytic circuit, the conductive tube is connected to the cathode. The conductive tube adopts a double-layer structure of an inner tube and an outer conductive tube, and a water-permeable material is filled between the inner and outer tubes. The specific construction method includes: (a) Level the site, measure the range where the electrolytic desaturation intelligent air-supplementing gravel pile needs to be placed, draw a layout plan, predetermine the drilling positions and bury the casing. (b) Drill the hole and check whether the hole meets the requirements. (c) After the above steps are completed, configure a counterweight foundation for the tubular conductive grid and assemble it into a whole. (d) Sink the whole conductive grid into the predetermined hole. (e) Sink the conductive tube into the predetermined hole and insert it into the hollow of the counterweight foundation to achieve a fixing effect. (f) Push the graphite felt wrapped by geogrid along the outer wall of the fixed conductive tube. (g) After the above graphite felt sinks below the water surface, start backfilling to accelerate the sinking process. (h) Repeat steps f and g, continue to install the remaining graphite felts until the backfilling is completed to form a complete pile. (i) Connect the inner tube to a pump to fill part of the pores of the water-permeable material, then connect the corresponding wires of the conductive grid and the conductive tube to the anode and the cathode respectively, and then the electrolytic device electrolyzes and drains water by itself. (j) After the electrolysis stops, set a cushion layer on the top of the pile.

2. The construction method of an electrolytic desaturation intelligent air-supplemented gravel pile according to claim 1, characterized in that, The saturation monitor includes a humidity detector and an automatic switch.

3. The construction method of an electrolytic desaturation intelligent air-supplemented gravel pile according to claim 2, characterized in that, When the saturation monitored by the saturation monitor exceeds the preset value, the automatic switch is turned on; when the saturation returns to the preset value, the automatic switch is turned off.

4. The construction method of an electrolytic desaturation intelligent air-supplementing gravel pile according to claim 1, characterized in that, The outer surface of the outer conductive tube is perforated and non-woven fabric is pasted on the inner side.

5. The construction method of an electrolytic desaturation intelligent air-supplemented gravel pile according to claim 1, characterized in that, The inner tube is a flexible tube with micropores.

6. The construction method of an electrolytic desaturation intelligent air-complemented gravel pile according to claim 1, characterized in that The conductive felt is selected as graphite felt, and the graphite felt is wrapped by geogrid.

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