A method of reducing the soil moisture content of a runway trench base

Abstract

The present application relates to the technical field of road construction, and particularly relates to a method for reducing the water content of soil in the bottom of a runway trench, which is based on exploration data of a runway pre-excavation position to determine the position of a water-facing surface of an underground water channel; based on the position of the water-facing surface of the underground water channel, a lengthwise water intercepting trench is excavated between the position of the water-facing surface and a sideline on each side of the runway; based on the position of the lengthwise water intercepting trench, multiple transverse water intercepting trenches are excavated equidistantly below the lengthwise water intercepting trench; based on the position of the transverse water intercepting trench, a drainage open ditch is excavated below the transverse water intercepting trench, and an HDPE pipe is used to connect the transverse water intercepting trench and the drainage open ditch; after the transverse water intercepting trench and the drainage open ditch are connected by the HDPE pipe, the runway trench is excavated, a water-permeable geotextile is laid on the bottom of the lengthwise water intercepting trench by using a laying device, and then the lengthwise water intercepting trench is backfilled with mountain skin stones or gravel to form a permanent drainage blind ditch; the position of the water-facing surface of the underground water channel can be accurately obtained by using the exploration data, and then the water intercepting trench is excavated for drainage, thereby reducing the construction difficulty.

Description

Technical Field

[0001] This invention relates to the field of road construction technology, and in particular to a method for reducing the moisture content of the subgrade soil at the bottom of a runway trench. Background Technology

[0002] Because silty soil layers have extremely high moisture content, groundwater poses a serious threat to the stability of roadbeds. Reducing soil moisture content is crucial for enhancing road stability, improving durability, enhancing drainage performance, protecting the environment and ecosystems, improving traffic safety, saving maintenance costs, and adapting to different climatic conditions. By designing a reasonable drainage system, using permeable materials, strengthening soil improvement, and conducting regular monitoring and maintenance, the goal of reducing soil moisture content can be effectively achieved, ensuring the safe, stable, and long-term operation of roads.

[0003] However, in the existing technology, in order to avoid threatening the stability of the track, it is often necessary to excavate 1m deeper from the original ground level after construction to reach the design elevation, which makes the construction process extremely complicated. Summary of the Invention

[0004] This invention provides a method for reducing the moisture content of the subgrade soil at the bottom of a runway trench, in order to address the issues raised in the background art.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a method for reducing the moisture content of the subgrade soil at the bottom of a runway trough, comprising the following steps:

[0006] Based on the exploration data of the runway pre-excavation location, the location of the water-facing side of the underground waterway was determined;

[0007] Based on the location of the underground waterway's water-facing side, a continuous intercepting ditch will be excavated between the design edge line of each side of the runway and the location of the underground waterway's water-facing side.

[0008] Based on the location of the long intercepting ditch, multiple transverse intercepting ditches were excavated at equal intervals below it;

[0009] Based on the location of the transverse intercepting ditch, an open drainage ditch is excavated below it, and HDPE pipes are used to connect the transverse intercepting ditch and the open drainage ditch.

[0010] After connecting the transverse intercepting ditch and the open drainage ditch with HDPE pipes, the runway trench is excavated, and permeable geotextile is laid at the bottom of the long intercepting ditch using a laying device. Then, the long intercepting ditch is backfilled with mountain stone or gravel to form a permanent drainage blind ditch.

[0011] Preferably, the exploration data is obtained by obtaining stratigraphic samples through geological drilling.

[0012] Preferably, after obtaining the formation sample through geological drilling, the empirical value of the formation permeability coefficient is obtained by the constant pressure method as 0.01 m / d.

[0013] Preferably, after obtaining the empirical value of the formation permeability coefficient as 0.01 m / d through the constant pressure method, the groundwater level fluctuation is determined to be 1-2 m based on the water level well detection method, and the final position of the groundwater channel is determined to be 0.70-3.50 m below the natural ground surface.

[0014] Preferably, when a continuous intercepting ditch is excavated between the design edge line of each side of the runway and the water-facing side of the underground waterway, based on the water-facing side of the underground waterway being 0.70-3.50m below the natural ground level, the distance between the designed continuous intercepting ditch and the design edge line of one side of the runway is 10m.

[0015] Preferably, the distance between two adjacent transverse intercepting ditches is 100m.

[0016] Preferably, when connecting the transverse intercepting ditch to the open drainage ditch using HDPE pipe, an HDPE pipe with a diameter of 200mm is used.

[0017] Preferably, the laying device includes: a mounting frame, guide wheels, guide rollers, collecting rollers, an adhesive application mechanism, and a power mechanism. One bottom end of the mounting frame is rotatably connected to a guide wheel, and the other bottom end of the mounting frame is rotatably connected to a rotating shaft. A guide roller is connected to the rotating shaft, a collecting roller is rotatably connected to the mounting frame, and an adhesive application mechanism is connected to the mounting frame. The output end of the adhesive application mechanism is positioned facing the top of the guide rollers, and the rotating shaft is connected to the adhesive application mechanism through the power mechanism.

[0018] Preferably, the glue application mechanism includes: a glue storage tank, a glue dispensing pipe, and a glue application pipe. The top of the mounting frame is connected to the glue storage tank, the bottom of the glue storage tank is connected to the top of the glue dispensing pipe, and the top of the glue storage tank is connected to the bottom of the glue application pipe.

[0019] Preferably, the adhesive application mechanism further includes: a pump housing, a pump shaft, and pump blades. The bottom end of the adhesive outlet pipe is connected to one side of the pump housing. The pump shaft is rotatably connected inside the pump housing. Multiple pump blades are connected to the pump shaft. The pump blades are placed inside the pump housing. A pulley from the power mechanism is connected to the side wall of the pump shaft outside the pump housing. The pulley is connected to a second pulley via a belt. The second pulley is mounted on a rotating shaft. The other side of the pump housing is connected to the second side of the pump housing via a connecting pipe.

[0020] The beneficial effects of this invention are as follows:

[0021] In the solution of this invention:

[0022] By utilizing exploration data, the location of the water source in the underground waterway can be accurately determined, allowing for the excavation of intercepting ditches for drainage and reducing construction difficulty. Attached Figure Description

[0023] Figure 1 This is a flowchart of the present invention;

[0024] Figure 2 This is a schematic diagram of the laying device structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the installation position of the adhesive storage tank according to the present invention;

[0026] Figure 4 This is a cross-sectional view of the pump casing of the present invention;

[0027] Figure 5 This is a two-section view of the pump casing of the present invention;

[0028] Figure 6 This is a schematic diagram showing the connection relationship between the second spring and the heat sink of the present invention;

[0029] Figure 7 This is a schematic diagram of the connection between the pump shaft and the gear in this invention.

[0030] The components include: 1. Laying device; 2. Mounting frame; 3. Guide roller; 4. Guide roller; 5. Receiving roller; 6. Glue application mechanism; 7. Glue storage tank; 8. Glue outlet pipe; 9. Glue filling pipe; 10. Pump housing; 11. Pump shaft; 12. Pump blade; 13. Pulley; 14. Belt; 15. Pulley II; 16. Rotating shaft; 17. Connecting pipe; 18. Pump housing II; 19. Connecting pipe II; 20. Output pipe; 21. Pulley III; 22. Belt II; 23. Pulley IV; 24. Rotating shaft II; 25. Turntable; 26. Round hole; 27. Receiving cavity; 28. Round hole II; 29. ​​Spring; 30. Pressure column; 31. Lifting shell; 32. Spring II; 33. Heat dissipation plate; 34. Expansion cavity; 35. Connecting rod; 36. Mounting pipe; 37. Sleeve; 38. Spring III; 39. Guide block; 40. Chamfer; 41. Mounting ring; 42. Guide ring; 43. Chamfer II; 44. Sleeve II; 45. Fan blade; 46. Gear ring; 47. Gear; 48. Detailed Implementation

[0031] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0032] Example 1: Reference Figures 1-7 A method for reducing the moisture content of the subgrade soil at the bottom of a runway trench includes the following steps:

[0033] Based on the exploration data of the runway pre-excavation location, the location of the water-facing side of the underground waterway was determined;

[0034] Based on the location of the underground waterway's water-facing side, a continuous intercepting ditch will be excavated between the design edge line of each side of the runway and the location of the underground waterway's water-facing side.

[0035] Based on the location of the long intercepting ditch, multiple transverse intercepting ditches were excavated at equal intervals below it;

[0036] Based on the location of the transverse intercepting ditch, an open drainage ditch is excavated below it, and HDPE pipes are used to connect the transverse intercepting ditch and the open drainage ditch.

[0037] After connecting the transverse intercepting ditch and the open drainage ditch with HDPE pipes, the runway trench is excavated, and permeable geotextile is laid at the bottom of the continuous intercepting ditch using laying device 1. Then, the continuous intercepting ditch is backfilled with mountain stone or gravel to form a permanent drainage blind ditch.

[0038] The principles and beneficial effects of the above scheme are as follows:

[0039] Geological exploration was conducted at the pre-excavation site of the runway to obtain exploration data, thereby determining the location of the water-facing surface of the underground water channel. Due to the high water content of the silty clay strata and the large amount of phreatic groundwater contained within them, in order to prevent groundwater from seeping into the runway trench after construction, after determining the location of the water-facing surface of the underground water channel, a continuous intercepting ditch was excavated 10m on each side of the runway design edge line. The continuous intercepting ditch was used to collect and discharge surface runoff. Subsequently, multiple intercepting ditches were excavated below the continuous intercepting ditch to improve the efficiency of surface runoff collection. Furthermore, the transverse intercepting ditches were connected to the open drainage ditch using HDPE pipes to increase the efficiency of runoff discharge. HDPE pipes, or high-density polyethylene pipes, have the characteristics of high strength and strong impact resistance. The use of HDPE pipes increased the stability of the connection between the transverse intercepting ditches and the open drainage ditch. Finally, permeable geotextile was laid on the bottom wall of the continuous intercepting ditch to prevent soil erosion.

[0040] By utilizing exploration data, the location of the water source in the underground waterway can be accurately determined, allowing for the excavation of intercepting ditches for drainage and reducing construction difficulty.

[0041] Example 2: Reference Figures 1-7 The exploration data is obtained by obtaining stratigraphic samples through geological drilling.

[0042] The principles and beneficial effects of the above scheme are as follows:

[0043] Geological drilling can efficiently determine the composition of strata, allowing for the selection of appropriate methods to acquire experimental data.

[0044] Example 3: Reference Figures 1-7 After obtaining formation samples through geological drilling, the formation permeability coefficient was empirically determined to be 0.01 m / d using the constant pressure method.

[0045] The principles and beneficial effects of the above scheme are as follows:

[0046] When determining the empirical value of formation permeability coefficient to be 0.01 m / d, the constant pressure method in the existing technology is selected, which greatly improves the efficiency of determining the empirical value of formation permeability coefficient.

[0047] Example 4: Reference Figures 1-7 After obtaining the empirical value of the formation permeability coefficient as 0.01 m / d through the constant pressure method, the groundwater level fluctuation was determined to be 1-2 m based on the water level well detection method, and the final position of the groundwater channel was determined to be 0.70-3.50 m below the natural ground surface.

[0048] The principles and beneficial effects of the above scheme are as follows:

[0049] When determining the fluctuation range of groundwater level, the location of the incoming water in the groundwater channel can also be obtained, which greatly improves the efficiency of determining the location of the incoming water in the groundwater channel.

[0050] Example 5: Reference Figures 1-7 When excavating a continuous intercepting ditch between the design edge line of each side of the runway and the water-facing side of the underground waterway, based on the location of the water-facing side of the underground waterway being 0.70-3.50m below the natural ground surface, the distance between the design continuous intercepting ditch and the design edge line of one side of the runway is 10m.

[0051] The principles and beneficial effects of the above scheme are as follows:

[0052] The intercepting ditch is set between the underground water inlet and the runway design line. After obtaining the underground water inlet position at 0.70-3.50m below the natural ground surface, in order to absorb the water in the strata and surface runoff to the greatest extent, the distance between the long intercepting ditch and the design edge line of one side of the runway is 10m.

[0053] Example 6: Reference Figures 1-7 The distance between two adjacent transverse intercepting ditches is 100m.

[0054] The principles and beneficial effects of the above scheme are as follows:

[0055] The spacing between transverse intercepting ditches is set at 100m, which can help collect runoff water under the continuous intercepting ditches and further improve the stability of the roadbed after construction.

[0056] Example 7: Reference Figures 1-7 When connecting the transverse intercepting ditch to the open drainage ditch using HDPE pipe, a 200mm diameter HDPE pipe is used.

[0057] The principles and beneficial effects of the above scheme are as follows:

[0058] After connecting the horizontal intercepting ditch to the open drainage ditch using HDPE pipes, the water from the horizontal intercepting ditch can be quickly discharged into the open drainage ditch due to the 200mm diameter of the HDPE pipes, preventing the ditch from being soaked. At the same time, the 200mm diameter of the HDPE pipes can also prevent debris from clogging the pipe structure during drainage.

[0059] Example 8: Reference Figures 1-7 The laying device 1 includes: a mounting frame 2, a guide wheel 3, a guide roller 4, a collection roller 5, an adhesive application mechanism 6, and a power mechanism 7. The bottom end of the mounting frame 2 is rotatably connected to the guide wheel 3, and the other bottom end of the mounting frame 2 is rotatably connected to the rotating shaft 17. The guide roller 4 is connected to the rotating shaft 17. The collection roller 5 is rotatably connected to the mounting frame 2. The adhesive application mechanism 6 is connected to the mounting frame 2. The output end of the adhesive application mechanism 6 is set towards the top of the guide roller 4. The rotating shaft 17 is connected to the adhesive application mechanism 6 through the power mechanism 7.

[0060] The principle behind the above scheme is as follows:

[0061] The permeable geotextile is stored using the storage roller 5, and the permeable geotextile is wound around the guide roller 4, with the end of the permeable geotextile facing the guide wheel 3.

[0062] In the existing technology, the permeable geotextiles commonly used are mostly fixed by mechanical means: that is, the permeable geotextile is fixed to the bottom wall of the long intercepting ditch by anchor nails, buckles or ropes, or the permeable geotextile is welded to the bottom wall of the long intercepting ditch by hot melt welding machine and hot air gun. The former method is prone to loosening of the connectors or tearing of the permeable geotextile during freeze-thaw cycles, while the latter method is prone to damage to the permeable geotextile during hot melt welding. Therefore, it can be seen that the water interception function will fail.

[0063] Therefore, this application utilizes the gluing mechanism 6 to bond the permeable geotextile to the bottom wall of the continuous intercepting ditch. The specific direction of movement of the device when laying the permeable geotextile is as follows: the mounting frame 2 is pushed to move, and under the guidance of the guide wheel 3, the mounting frame 2 moves from one end of the device to the other end. As the device moves, the permeable geotextile is laid on the bottom wall of the continuous intercepting ditch. The receiving roller 5 releases the permeable geotextile when the device is working. During the movement of the device, the guide roller 4 and the rotating shaft 17 rotate clockwise synchronously. The rotating shaft 17 drives the gluing mechanism 6 to work through the power mechanism 7, applying the glue in the gluing mechanism 6 to the permeable geotextile above the guide roller 4. As the guide roller 4 rotates, the permeable geotextile after applying the glue forms a firm bond with the bottom wall of the continuous intercepting ditch. After the laying of the permeable geotextile is completed, it can be cut with a knife to complete the laying.

[0064] The adhesive used in the bonding process of permeable geotextiles is polyurethane adhesive, which has excellent bonding strength and weather resistance.

[0065] The beneficial effects of the above scheme are as follows:

[0066] The device applies adhesive to the permeable geotextile through a 6-way adhesive applicator, bonding the permeable geotextile to the bottom wall of the continuous intercepting ditch using adhesive bonding. This greatly improves the bonding strength and prevents the permeable geotextile from tearing during dynamic freeze-thaw cycles. Therefore, the bonded permeable geotextile can be used in various climatic environments, exhibiting high practicality and laying efficiency.

[0067] Example 9: Reference Figures 1-7 The glue application mechanism 6 includes a glue storage tank 8, a glue dispensing pipe 9, and a glue application pipe 10. The top of the mounting frame 2 is connected to the glue storage tank 8, the bottom of the glue storage tank 8 is connected to the top of the glue dispensing pipe 9, and the top of the glue storage tank 8 is connected to the bottom of the glue application pipe 10.

[0068] The principles and beneficial effects of the above scheme are as follows:

[0069] The polyurethane adhesive in the storage tank 8 is added through the glue addition tube 10. When the adhesive is output through the glue addition tube 10, the glue addition tube 10 can connect the storage tank 8 with the external environment. Therefore, the glue addition tube 10 has enough air pressure to output the adhesive.

[0070] After the glue is dispensed, an organic solvent can be added to the glue storage tank 8 through the glue dispensing tube 10. The organic solvent is toluene solution with strong glue removal function. The addition of organic solvent can quickly remove the residual glue in the glue storage tank 8 and the glue dispensing tube 9.

[0071] Example 10: Reference Figures 1-7 The adhesive application mechanism 6 further includes: a pump housing 11, a pump shaft 12, and pump blades 13. The bottom end of the adhesive outlet pipe 9 is connected to one side of the pump housing 11. The pump shaft 12 is rotatably connected inside the pump housing 11. Multiple pump blades 13 are connected to the pump shaft 12. The pump blades 13 are placed inside the pump housing 11. The side wall of the pump shaft 12 outside the pump housing 11 is connected to a pulley 14 in the power mechanism 7. The pulley 14 is connected to a second pulley 16 via a belt 15. The second pulley 16 is mounted on a rotating shaft 17. The other side of the pump housing 11 is connected to the side of the second pump housing 19 via a connecting pipe 18.

[0072] The principle behind the above scheme is as follows:

[0073] Polyurethane adhesive itself has a certain viscosity, so it needs to be applied by external force to promote its flow when it is output. When the device starts to move, the clockwise rotation of the guide roller 4 drives the rotation of the shaft 17. The synchronous rotation of the pulley 16 drives the belt 15 to move, which in turn drives the pulley 14 and the pump shaft 12 to rotate. At the same time, the pump blade 13 rotates, and the adhesive is drawn into the pump housing 11 through the glue outlet pipe 9, and then input into the pump housing 19 through the connecting pipe 18.

[0074] The beneficial effects of the above scheme are as follows:

[0075] The device is equipped with a pulley 14 that is connected to a second pulley 16 via a belt 15. The second pulley 16 is mounted on a rotating shaft 17. Therefore, when the device moves, the rotation of the rotating shaft 17 can eventually drive the rotation of the pump shaft 12, thereby achieving the suction of glue. This reduces the need for a power mechanism within the device and thus reduces the complexity of the device.

[0076] Since polyurethane adhesive itself has a certain viscosity, a pump blade 13 is installed in the device to transport the adhesive, which increases the pressure on the adhesive during transportation and prevents the adhesive from sticking inside the device.

[0077] Because the pump blade 13 has a large contact area, the glue can rub against the pump blade 13 when it is conveyed in the pump housing 11. The increased friction raises the temperature of the glue itself, thus increasing its fluidity and further reducing the flow rate of the glue. At the same time, when the device is used in a low-temperature environment, the heat generated by friction can increase its fluidity and prevent the glue from sticking inside the device, which greatly improves the device's ability to work normally in different environments.

[0078] Example 11: Reference Figures 1-7 The glue application mechanism 6 further includes: a second pump housing 19, a second connecting pipe 20, and an output pipe 21. The bottom of the second pump housing 19 is connected to the top of the second connecting pipe 20 through a transfer pipe. The bottom of the second connecting pipe 20 is connected to the top of a plurality of output pipes 21, and the bottom of the output pipes 21 is set towards the top of the guide roller 4.

[0079] The principle behind the above scheme is as follows:

[0080] The adhesive enters the pump housing 19 through the connecting pipe 18. The adhesive in the pump housing 19 enters the connecting pipe 20 through the transfer pipe. It flows through the connecting pipe 20 to multiple output pipes 21 and then to the permeable geotextile.

[0081] The beneficial effects of the above scheme are as follows:

[0082] The mechanism is equipped with multiple output pipes 21 connected to the connecting pipe 20, which increases the uniformity of the adhesive output to the permeable geotextile when the adhesive is output to the permeable geotextile. Furthermore, when the permeable geotextile is rolled by the rotating guide roller 4, the adhesive is spread horizontally, which increases the bonding area of ​​the adhesive between the permeable geotextile and the long intercepting ditch.

[0083] Example 12: Reference Figures 1-7The pump shaft 12 is connected to a pulley 22 at one end outside the pump housing 11. The pulley 22 is connected to a pulley 24 via a belt 23. The pulley 24 is mounted on a rotating shaft 25. The rotating shaft 25 is rotatably connected to the pump housing 19. The end of the rotating shaft 25 inside the pump housing 19 is connected to a turntable 26. The turntable 26 is rotatably sealed to the pump housing 19. One side of the turntable 26 has a circular hole 27 at one end. The circular hole 27 is coaxially arranged with the connecting pipe 18. The other end of the circular hole 27 is connected to the inner wall of one side of the receiving cavity 28 inside the turntable 26. The other side of the receiving cavity 28 has a circular hole 29 at one end. The circular hole 29 is coaxially arranged with the circular hole 27. The inner wall of the circular hole 29 is connected to the end of a spring 30. The other end of the spring 30 is connected to the end of a pressure column 31. The pressure column 31 is slidably sealed to the circular hole 29.

[0084] The principle behind the above scheme is as follows:

[0085] When the pump shaft 12 rotates, the pulley 3 22 rotates synchronously, and the belt 23 drives the pulley 4 24 and the shaft 2 25 to rotate. At this time, the turntable 26 rotates synchronously, and the glue in the connecting pipe 18 enters the receiving cavity 28 through the round hole 27.

[0086] When the device moves at a high speed, the volume of glue output from the connecting pipe 18 is large. Under the influence of the large centrifugal force generated when the turntable 26 rotates and the relatively large increase in the volume of glue, the pressure column 31 is subjected to a large pressure, and the spring 30 is compressed to a large degree.

[0087] When the device moves slowly, the volume of glue output from the connecting pipe 18 is small. Under the influence of the small centrifugal force generated when the turntable 26 rotates and the relatively small increase in the volume of glue, the pressure on the pressure column 31 is small, and the spring 30 is compressed to a small degree.

[0088] As the turntable 26 continues to rotate, the round hole 27 connects with the adapter pipe, and the glue enters the connecting pipe 20. Since the turntable 26 is provided with the round hole 27, and the turntable 26 and the pump housing 2 19 rotate and seal, the glue finally output through the output pipe 21 is in an intermittent output state.

[0089] After the device stops moving, the circular hole 27 is connected to the connecting pipe 20 for the last time. Under the action of gravity and the elastic force of the spring 30, the pressure column 31 moves downward to reset, and the remaining glue in the receiving cavity 28 is output through the circular hole 27.

[0090] The beneficial effects of the above scheme are as follows:

[0091] A round hole 27 is made on the turntable 26 so that the glue can be intermittently output from the output pipe 21 to the permeable geotextile. This prevents the glue from being wasted due to the excessive output speed, avoids the overflow of glue after laying due to excessive glue on the permeable geotextile, and prevents glue from sticking to other devices or operators, thus ensuring the cleanliness of the surrounding environment during operation.

[0092] The design of the receiving cavity 28 ensures the consistency of the amount of glue delivered intermittently within the mechanism;

[0093] When the circular hole 27 is coaxial with the output tube 21, the glue can be discharged through the output tube 21 under the action of gravity and centrifugal force, which reduces the difficulty of discharging the glue in the mechanism. At the same time, due to the intermittent discharge of glue by the mechanism, the fluidity of the glue increases. At this time, there will be no large amount of residual glue at the output end of the output tube 21, which will not stick to the nearby device or operator.

[0094] The receiving cavity 28 works in conjunction with the pressure column 31. When the device moves too fast, the pressure column 31 has a large displacement when it contracts into the second round hole 29. This prevents the receiving cavity 28 from expanding excessively when receiving glue, which could cause the turntable 26 to deform. This ensures that the turntable 26 can rotate safely and smoothly in the second pump housing 19. At the same time, it can prevent the connecting pipe 18 from being subjected to excessive pressure and breaking when the glue is output, thus extending the service life of the device.

[0095] After the device has completed the laying work, the pressure column 31 moves downward under the action of the spring force of the spring 30 and gravity, thereby causing the residual glue in the storage cavity 28 to be discharged through the output pipe 21, thus avoiding the presence of residual glue in the mechanism.

[0096] Meanwhile, after the laying work is completed, organic solvent can be added through the output pipe 21 to clean the residual glue in the receiving cavity 28, which increases the cleaning method and the thoroughness of the cleaning of the device, and at the same time can prevent the pressure column 31 from sticking to the second round hole 29.

[0097] Example 13: Reference Figures 1-7 The bottom of the lifting shell 32 is connected to the pump housing 11. The bottom end of the second spring 33 is connected to the bottom wall of the lifting shell 32. The top end of the second spring 33 is connected to the bottom end of the heat sink 34. The heat sink 34 is slidably connected to the inner wall of the lifting shell 32. An expansion cavity 35 is formed between the bottom of the heat sink 34 and the inner wall of the lifting shell 32. Hydraulic oil is injected into the expansion cavity 35. The top of the heat sink 34 extends to the top surface of the lifting shell 32.

[0098] The principle behind the above scheme is as follows:

[0099] After the mechanism has been working for a period of time, the temperature of the pump casing 11 will rise due to the rotation of the pump shaft 12 relative to the pump casing 11, the friction between the pump blade 13 and the glue, or the increase in the temperature of the external environment. When the temperature of the parts in the mechanism rises, the fluidity of the glue will increase rapidly, which will lead to the increased fluidity of the glue output to the permeable geotextile, which will cause the glue to flow out of the contact surface between the permeable geotextile and the bottom wall of the continuous intercepting ditch, thus causing the two to be unable to be bonded smoothly. Therefore, when the temperature of the pump casing 11 rises, the temperature of the hydraulic oil in the expansion chamber 35 rises and expands, the heat sink 34 slides outward along the lifting shell 32, the length of the second spring 33 increases, and the area of ​​the heat sink 34 placed on the outside increases.

[0100] When the temperature of the pump housing 11 drops, the temperature of the hydraulic oil decreases, and its volume shrinks. Under the elastic force of the spring 33 returning to its original position, the heat sink 34 slides into the interior of the lifting housing 32.

[0101] The beneficial effects of the above scheme are as follows:

[0102] An expansion chamber 35 is provided inside the mechanism. Hydraulic oil is added to the expansion chamber 35 to absorb the heat of the pump casing 11. At the same time, the pump casing 11 is cooled by increasing the contact area between the heat dissipation plate 34 and the air. This avoids the increase in the fluidity of the adhesive due to high temperature during operation and further improves the bonding effect between the permeable geotextile and the bottom wall of the long intercepting ditch.

[0103] The setting of spring 2 33 increases the stability of heat sink 34 in lifting shell 32. When the volume of hydraulic oil changes, the length of spring 2 33 changes accordingly, and can prevent heat sink 34 from falling.

[0104] When the device overheats, the area of ​​the heat sink 34 exposed to the air increases; when the device operates in a low-temperature environment, the area of ​​the heat sink 34 exposed to the air decreases. The change in the area of ​​the heat sink 34 exposed to the air significantly improves the device's ability to operate in different environments.

[0105] Example 14: Reference Figures 1-7The pump housing 11 has an end face connected to the end of the mounting tube 37, and the other end face of the pump housing 11 faces the pulley 22. The side wall of the other end of the mounting tube 37 is slidably connected to the inner wall of the end of the sleeve 38. The end of the sleeve 38 is connected to the end face of the pump housing 11 via a spring 39. The side of the heat dissipation plate 34 has an end face connected to the end of the connecting rod 36, and the other end of the connecting rod 36 is connected to the end of the guide block 40. The top of the other end of the guide block 40 is provided with a chamfer 41. An mounting ring 42 is connected to the sleeve 38, and the end face of the mounting ring 42 is connected to the end of the guide ring 43. The guide ring 43 is positioned with its other end facing the end face of the pump housing 11. A chamfer 44 is provided between the guide ring 43 and the mounting ring 42. The chamfer 44 and the chamfer 41 are in frictional engagement. The inner wall of the sleeve 45 is rotatably connected to the sleeve 38. Multiple fan blades 46 are connected to the side wall of the sleeve 45. A gear ring 47 is connected to the inner wall of the other end of the sleeve 45 away from the mounting ring 42. The gear ring 47 and the gear 48 are spaced apart. The gear 48 is positioned at the other end away from the sleeve 45. The gear 48 is connected to the other side wall of the pump shaft 12 located outside the pump housing 11.

[0106] The principle behind the above scheme is as follows:

[0107] When the device temperature rises, the heat sink 34 moves away from the pump housing 11, so the connecting rod 36 moves synchronously and drives the guide block 40 to move. At this time, the chamfer 41 on the guide block 40 and the second chamfer 44 are in frictional engagement. The guide ring 43 and the mounting ring 42 move away from the pump housing 11. While the sleeve 38 moves away from the pump housing 11, the spring 39 is stretched. When the sleeve 38 drives the toothed ring 47 installed in the second sleeve 45 to mesh with the gear 48, due to the rotation of the pump shaft 12, the gear 48 drives the toothed ring 47 and the second sleeve 45 to rotate, which in turn drives the fan blade 46 to rotate.

[0108] When the temperature of the device decreases, the heat sink 34 moves toward the pump housing 11, synchronously driving the connecting rod 36 and the chamfer 41 to move. The chamfer 41 and the second chamfer 44 engage in reverse frictional contact. Under the elastic force of the spring 39 returning to its original position, the sleeve 38, guide ring 43, mounting ring 42, sleeve 2 45, fan blade 46 and gear ring 47 move toward the pump housing 11. The gear ring 47 ends its meshing connection with the gear 48, and then the fan blade 46 stops rotating.

[0109] The beneficial effects of the above scheme are as follows:

[0110] When the heat sink 34 extends to dissipate heat, the rotation of the fan blade 46 can increase the cooling speed of the heat sink 34 and dissipate heat on the pump casing 11, further improving the heat dissipation speed in the mechanism. Therefore, the fluidity of the glue flowing in the mechanism can be reduced to its standard value.

[0111] The rotation of the fan blade 46 can also reduce the temperature generated by the relative friction between the pump shaft 12 and the pump casing 11, thereby avoiding excessive heat between the components caused by friction and preventing deformation of the components caused by temperature rise.

[0112] The mechanism can control the fan blades 46 to rotate or stop rotating based on the actual situation, which further improves the autonomous control capability of the device. At the same time, it makes full use of the power inside the device, further reducing the setting of the power mechanism and reducing the cost invested in the manufacturing of the device.

[0113] The airflow generated by the rotation of fan blade 46 can also cool pulley 3 22 and pulley 14;

[0114] Since the two are coaxially arranged and respectively fitted with belt 23 and belt 15, the friction between the pulley mechanism and the belt mechanism will cause the pump shaft 12 to generate a lot of heat. The airflow can reduce the temperature of pulley 22, pulley 14, belt 23 and belt 15. This can not only cool down the above four parts, but also cool down the pump shaft 12, preventing any part from losing the transmission function between the parts due to excessive temperature, thus improving the safety of the device during operation.

[0115] Since the device needs to work in different construction environments, when working in certain special work sites, such as construction sites with a lot of dust, the dust will cause the pulley mechanism and belt mechanism to jam. At this time, the airflow generated by the fan blade 46 can blow away the dust on the parts and prevent the parts from jamming.

[0116] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for reducing the moisture content of the subgrade soil at the bottom of a runway trench, characterized in that, Includes the following steps: Based on the exploration data of the runway pre-excavation location, the location of the water-facing side of the underground waterway was determined; Based on the location of the underground waterway's water-facing side, a continuous intercepting ditch will be excavated between the design edge line of each side of the runway and the location of the underground waterway's water-facing side. Based on the location of the long intercepting ditch, multiple transverse intercepting ditches were excavated at equal intervals below it; Based on the location of the transverse intercepting ditch, an open drainage ditch is excavated below it, and HDPE pipes are used to connect the transverse intercepting ditch and the open drainage ditch. After connecting the transverse intercepting ditch and the open drainage ditch with HDPE pipes, the runway trench is excavated, and permeable geotextile is laid at the bottom of the continuous intercepting ditch using the laying device (1). Then, the continuous intercepting ditch is backfilled with mountain stone or gravel to form a permanent drainage blind ditch. The laying device (1) includes: a mounting frame (2), a guide wheel (3) is rotatably connected to one end of the bottom of the mounting frame (2), a rotating shaft (17) is rotatably connected to the other end of the bottom of the mounting frame (2), a guide roller (4) is connected to the rotating shaft (17), a collection roller (5) is rotatably connected to the mounting frame (2), and an adhesive applicator (6) is connected to the mounting frame (2). The output end of the adhesive applicator (6) is set towards the top of the guide roller (4), and the rotating shaft (17) is connected to the adhesive applicator (6) through a power mechanism (7). The glue application mechanism (6) includes: a glue storage tank (8), the top of the mounting frame (2) is connected to the glue storage tank (8), the bottom of the glue storage tank (8) is connected to the top of the glue outlet pipe (9), and the top of the glue storage tank (8) is connected to the bottom of the glue application pipe (10). The adhesive application mechanism (6) further includes: a pump housing (11), the bottom end of the adhesive outlet pipe (9) is connected to one side of the pump housing (11), a pump shaft (12) is rotatably connected inside the pump housing (11), a plurality of pump blades (13) are connected on the pump shaft (12), the pump blades (13) are placed inside the pump housing (11), and the side wall of the pump shaft (12) outside the pump housing (11) is connected to a pulley (14) in the power mechanism (7), the pulley (14) is connected to a second pulley (16) via a belt (15), the second pulley (16) is mounted on a rotating shaft (17), and the other side of the pump housing (11) is connected to the side of the second pump housing (19) via a connecting pipe (18).

2. The method for reducing the moisture content of the subgrade soil at the bottom of a runway trench according to claim 1, characterized in that, The exploration data is obtained by obtaining stratigraphic samples through geological drilling.

3. The method for reducing the moisture content of the subgrade soil at the bottom of a runway trench according to claim 2, characterized in that, After obtaining formation samples through geological drilling, the formation permeability coefficient was empirically determined to be 0.01 m / d using the constant pressure method.

4. The method for reducing the moisture content of the subgrade soil at the bottom of a runway trench according to claim 3, characterized in that, After obtaining the empirical value of the formation permeability coefficient as 0.01 m / d through the constant pressure method, the groundwater level fluctuation was determined to be 1-2 m based on the water level well detection method, and the final position of the groundwater channel was determined to be 0.70-3.50 m below the natural ground surface.

5. The method for reducing the moisture content of the subgrade soil at the bottom of a runway trench according to claim 1, characterized in that, When excavating a continuous intercepting ditch between the design edge line of each side of the runway and the water-facing side of the underground waterway, based on the location of the water-facing side of the underground waterway being 0.70-3.50m below the natural ground level, the distance between the designed continuous intercepting ditch and the design edge line of one side of the runway is 10m.

6. The method for reducing the moisture content of the subgrade soil at the bottom of a runway trench according to claim 1, characterized in that, The distance between two adjacent transverse intercepting ditches is 100m.

7. The method for reducing the moisture content of the subgrade soil at the bottom of a runway trench according to claim 1, characterized in that, When connecting the transverse intercepting ditch to the open drainage ditch using HDPE pipe, a 200mm diameter HDPE pipe is used.

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