Saline soil foundation anti-seepage geomembrane laying device and control method thereof

Abstract

The application relates to the technical field of building construction equipment, in particular to a salted soil foundation anti-seepage geomembrane laying device and a control method thereof. The device comprises a vehicle frame, a sliding seat is slidably connected to the outer wall of the vehicle frame, a pay-off mechanism and a joint mechanism are arranged on the vehicle frame, and the pay-off mechanism comprises a pay-off frame which is slidably connected to the outer wall of the sliding seat. The mounting frame is arranged, when the geomembrane coil is mounted, the hanging coil shaft is taken off from the pay-off frame, the hanging coil shaft is inserted into the winding core of the coil or the central pipe, the electric push rod is controlled to contract, the pay-off frame drives the open slot to drop to a position with the same height as the hanging coil shaft on the coil, then the vehicle frame is moved, the hanging coil shaft is inserted into the open slot, the electric push rod is controlled to extend, the pay-off frame drives the coil to rise, and the installation of the geomembrane coil on the device is realized, the coil does not need to be carried by other equipment, the operation difficulty is greatly reduced, and the work efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of construction equipment technology, and in particular to a geomembrane laying device and control method for saline soil foundation seepage prevention. Background Technology

[0002] The stability of complex foundation structures in saline soil areas is a key scientific issue and engineering challenge in the construction of major linear projects such as railways and highways in arid and cold regions of western my country. Frequent occurrences of roadbed subsidence, slope slippage, and frost heave induced by water and salt migration seriously restrict the long-term safe operation of projects. The common treatment measure is to lay impermeable geomembranes on the soil foundation. Geomembranes are geosynthetic impermeable materials made of plastic film as the impermeable base material and non-woven fabric. Their main mechanism is to use the impermeability of plastic film to prevent water evaporation. Existing mechanical equipment typically lays geomembrane rolls by moving them along and releasing them simultaneously. While this method is more efficient than traditional manual laying, installing the geomembrane rolls on the equipment is quite cumbersome. In saline-alkali soil areas, the geomembrane used must be at least 0.75mm thick, and a single roll can weigh over 200kg. Therefore, hoisting equipment or multiple people working together is required, increasing the amount of pre-laying preparation work and failing to completely eliminate the need for manual labor.

[0003] Furthermore, the soil in saline-alkali areas contains a large amount of corrosive components such as sulfates and chlorides. Salt accumulates on the surface as water evaporates, and the laying equipment, in prolonged contact with the ground during operation, is highly susceptible to corrosion of its metal components, leading to shortened equipment lifespan and increased maintenance costs. Simultaneously, electrical components on the equipment are exposed to a high-salt, high-humidity construction environment, posing a risk of insulation failure and short circuits. Existing geomembrane laying equipment lacks specific material selection and protective design tailored to saline-alkali soil conditions, making it difficult to guarantee long-term reliable operation in these areas. The cyclical action of salt crystallization and water migration on saline-alkali soil foundations results in uneven surfaces with both localized uplift and subsidence, leading to uneven distribution of surface bearing capacity. Existing geomembrane laying equipment often uses fixed, rigid structures for its clamping mechanisms, which lack adaptability to changes in ground elevation. When operating on saline-alkali foundations with significant surface undulations, issues such as partial suspension of the clamping rollers and loose adhesion between the geomembrane and the ground can easily occur, affecting the seepage prevention effect. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and propose a geomembrane laying device and control method for saline soil foundation, including a geomembrane laying device for saline soil foundation and a control method for the geomembrane laying device for saline soil foundation.

[0005] First aspect: This invention proposes a geomembrane laying device for saline soil foundations. While addressing the convenience of geomembrane installation, it also incorporates specialized anti-corrosion designs for key components to improve the durability and reliability of the equipment in saline soil conditions, particularly given the high salt, high humidity, and strong corrosion of the soil. The device utilizes a specially designed mounting frame. During geomembrane installation, the hanging roll is removed from the unloading frame and inserted into the core or central tube of the geomembrane. The electric push rod retracts, causing the unloading frame to lower the opening slot to the same height as the hanging roll on the geomembrane. Then, by moving the frame, the hanging roll is inserted into the opening slot, and the electric push rod extends, causing the unloading frame to lift the geomembrane, thus installing the geomembrane on the device. This eliminates the need for other equipment to transport the geomembrane, significantly reducing operational difficulty and improving work efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a geomembrane laying device for saline soil foundations, comprising a frame, a sliding seat slidably connected to the outer wall of the frame, a winding unwinding mechanism and a seaming mechanism provided on the frame, the winding unwinding mechanism comprising a winding unwinding frame slidably connected to the outer wall of the sliding seat, a winding shaft for winding up the roll material rotatably connected to the bottom outer wall of the winding unwinding frame, and an electric push rod installed on the top outer wall of the winding unwinding frame, the output end of the electric push rod abutting against the top outer wall of the sliding seat. The slide block has a pair of symmetrically distributed support frames on both sides of the hanging roll on its bottom outer wall. Each support frame has a slider slidably connected to its inner wall. Each slider has a cutting machine on its outer wall. The middle outer wall of the frame has a mounting frame slidably connected to it. The bottom outer wall of the mounting frame has a pressure roller rotatably connected to it. A second spring is provided between the outer wall of the frame and the outer wall of the mounting frame. The top outer wall of the mounting frame has an abutment frame. The outer wall of the slide block has an inclined block fixed for lifting the abutment frame.

[0007] Preferably, the joint mechanism includes a hot melt welding machine fixed to the outer wall of the bottom end of the mounting frame, a lever plate fixed to the outer wall of the bottom end of the second spring, the lever plate being slidably sleeved on the outer wall of the mounting frame, and a pair of cleaning brushes symmetrically distributed on both sides of the hot melt welding machine being rotatably connected to the outer wall of the bottom end of the mounting frame.

[0008] Preferably, each of the cleaning brushes has a cam mounted on the outer wall of its rotating shaft. When the cam rotates, it causes a sliding plate to slide. A pair of drive motors for driving the cleaning brushes are mounted on the bottom outer wall of the mounting bracket.

[0009] Preferably, a first linear motor is mounted on the outer wall of the frame, and the slide is fixed on the outer wall of the output end of the first linear motor.

[0010] Preferably, the bottom outer wall of the unwinding frame is provided with an opening groove, and the hanging shaft is movably connected in the opening groove.

[0011] Preferably, a second linear motor is installed on the outer wall of each of the receiving frames, and each of the sliders is fixed on the outer wall of the output end of the second linear motor.

[0012] Preferably, each slider has an installation sleeve on the outer wall of the side near the hanging shaft, each installation sleeve has a sliding rod slidably connected inside, each sliding rod has a roller rotatably connected on the outer wall of the end near the hanging shaft, and a first spring is provided between the outer wall of the end of each sliding rod away from the hanging shaft and the inner wall of the installation sleeve.

[0013] Preferably, the inner wall of the receiving frame is provided with a storage groove for storing the cutting machine, and the inner wall of the storage groove is provided with a slope.

[0014] The second aspect: The present invention proposes a method for controlling the installation of geomembrane for saline soil foundation, comprising the following steps: Step 1, Loading the Geomembrane: Remove the hanging roll from the opening slot of the unwinding frame and insert it into the core or central tube of the geomembrane roll; control the electric push rod to retract, causing the unwinding frame to move down along the slide until the opening slot is at the same height as the hanging roll; drive the vehicle frame to move towards the hanging roll, guiding the hanging roll into the opening slot; control the electric push rod to extend, causing the unwinding frame to lift the hanging roll and the geomembrane roll as a whole to the laying working height, completing the loading of the geomembrane roll. Step 2, Laying Preparation: Confirm that the slide is located at the end of the vehicle frame closest to the laying direction; drive the vehicle frame carrying the geomembrane roll to the laying start position; pass the free end of the geomembrane roll through the top of the receiving frame and place it under the pressure roller, so that the pressure roller presses the free end of the geomembrane under the action of the second spring, and the laying preparation is completed. Step 3, Laying: The drive vehicle moves at a constant speed along the laying route. The free end of the geomembrane roll remains stationary relative to the ground under the pressure of the clamping roller. The roll on the hanging shaft is continuously released and unfolded as the vehicle moves. Simultaneously, the hot melt welding machine is started, and the edge of the geomembrane away from the clamping roller is placed between the heating wedge and the pressure roller of the hot melt welding machine to achieve simultaneous laying and welding. Simultaneously, the drive motor drives the cleaning brush to rotate and clean the surface of the geomembrane in the welding area. Simultaneously, the drive motor drives the cam to rotate. The cam periodically moves the pawl to compress the second spring. Under the rebound of the second spring, the pawl periodically hits the mounting frame, driving the clamping roller to continuously compact the laid geomembrane. Step three also includes closed-loop quality control of the hot melt welding process: real-time acquisition of the pressure holding time of the pressure roller, comparison with the preset pressure holding time threshold, and adjustment of the frame travel speed by outputting deceleration or acceleration commands. Under the synergistic effect of the three parameters of heating wedge working temperature, frame travel speed and pressure holding time of the pressure roller, a closed-loop control of welding quality is formed to ensure the consistency of weld bonding quality.

[0015] Step 4, End-of-Stroke Cutting: The vehicle stops moving after reaching the end of the single-laying stroke; the second linear motor is started, driving the slider to slide out of the storage groove along the receiving frame. Under the action of the first spring, the roller presses the geomembrane roll on the hanging roll to prevent the roll from rotating during cutting; the cutting machine is started, driving the slider to slide laterally along the receiving frame parallel to the axis of the hanging roll, completing the full-width automatic cutting of the geomembrane roll; after cutting, the second linear motor is controlled to drive the slider to retract into the storage groove. Step 5, Route Switching: Start the first linear motor to drive the slide block to move from the end of the frame to the middle of the frame. The inclined block on the slide block moves accordingly and contacts the abutment frame on the mounting frame. The inclined block pushes the abutment frame, causing the mounting frame to move upward. The pressure roller moves upward with the mounting frame and leaves the ground. Drive the frame to move laterally to the adjacent paving route. Start the first linear motor to drive the slide block to move to the end of the frame closer to the direction of travel of the new paving route. The inclined block disengages from the abutment frame, and the pressure roller returns to its working position under the action of the second spring. Repeat steps 2 to 4 to complete the paving of the adjacent route. Repeat this process until the geomembrane paving of the entire foundation area is completed.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, through its mounting frame, allows for the installation of geomembrane rolls. The hanging roll is removed from the unwinding frame, inserted into the core or central tube of the roll, and the electric push rod is retracted. This causes the unwinding frame to lower the opening slot to the same height as the hanging roll on the roll. Then, by moving the frame, the hanging roll is inserted into the opening slot, and the electric push rod is extended, causing the unwinding frame to lift the roll. This achieves the installation of the geomembrane roll on this device, eliminating the need for other equipment to transport the roll, significantly reducing operational difficulty and improving work efficiency.

[0017] 2. This invention utilizes a pressure roller to flatten the geomembrane, thereby ensuring close contact between the geomembrane and the ground without air bubbles, thus improving the flattening effect of the geomembrane. At the same time, when the vehicle frame moves the geomembrane roll in the laying direction, the free end of the geomembrane roll is pressed under the pressure roller, preventing the free end of the geomembrane roll from sliding relative to the ground, thereby allowing the geomembrane roll hanging on the roller to be pulled and released.

[0018] 3. The present invention uses a cutting machine that activates a second linear motor when the laying stroke is completed, causing the slider to slide out of the receiving groove. At the same time, the cutting machine is activated, causing the slider to slide along the receiving frame. The receiving frame is parallel to the hanging roll shaft, so that the slider drives the cutting machine to automatically cut the geomembrane roll along the axial direction of the hanging roll shaft. This improves the automation level of the device and helps to further improve work efficiency.

[0019] 4. The present invention, through its seam mechanism, allows the edge of the geomembrane furthest from the pressure roller to be placed between the heating wedge and pressure roller of the hot melt welding machine during geomembrane laying, enabling simultaneous laying and welding and further improving work efficiency. At the same time, the drive motor drives the cleaning brush to rotate, cleaning the geomembrane in the welding area to ensure welding effect. Under the action of the cam and the deflector, the deflector continuously impacts the mounting frame downwards, allowing the pressure roller on the mounting frame to further compact the gap between the geomembrane and the ground, ensuring that the geomembrane is in close contact with the ground without air bubbles.

[0020] 5. This invention addresses the challenges of high-salt, high-humidity, and highly corrosive construction environments in saline soil areas, as well as the unevenness of the foundation surface. It incorporates specialized anti-corrosion materials and protection level designs for key load-bearing structural components, transmission parts, and electrical components. Furthermore, the combination of a wide-track, low-ground-pressure chassis and an elastic floating clamping roller enhances the equipment's passability and self-adaptive clamping capability on saline soil foundations, significantly improving the long-term reliability and laying quality of the equipment in saline soil regions. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the overall structure proposed in this invention. Figure 1 ; Figure 2 This is a three-dimensional sectional view of the vehicle frame proposed in this invention; Figure 3 This is a three-dimensional schematic diagram of the unwinding mechanism proposed in this invention; Figure 4 This is a three-dimensional schematic diagram of the slide block proposed in this invention; Figure 5 This is a three-dimensional cross-sectional view of the slider proposed in this invention; Figure 6 This is a three-dimensional schematic diagram of the unwinding frame proposed in this invention; Figure 7 This is a three-dimensional schematic diagram of the overall structure proposed in this invention. Figure 2 ; Figure 8 This is a three-dimensional schematic diagram of the seam mechanism proposed in this invention; Figure 9 This is a flowchart of a method for controlling the laying of geomembrane for saline soil foundations, as proposed in this invention. Figure 10 The pressure holding response time curve proposed in this invention; Figure 11 This is the chassis travel speed response curve proposed in this invention.

[0022] Legend: 1. Frame; 11. First linear motor; 12. Slide; 121. Inclined block; 122. Receiving frame; 123. Storage slot; 124. Ramp; 13. Unwinding frame; 131. Opening slot; 132. Hanging reel; 14. Electric push rod; 15. Second linear motor; 151. Slider; 152. Cutting machine; 153. Mounting sleeve; 154. Slide rod; 155. Roller; 156. First spring; 2. Mounting frame; 21. Second spring; 22. Pulley; 23. Pressure roller; 24. Hot melt welding machine; 25. Abutment frame; 3. Drive motor; 31. Cleaning brush; 32. Cam. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] First embodiment: See Figures 1 to 8 As shown, a geomembrane laying device for saline soil foundation includes a frame 1, a sliding seat 12 slidably connected to the outer wall of the frame 1, and a roll-out mechanism and a jointing mechanism provided on the frame 1. It should be noted that, considering the characteristics of working conditions where corrosive components such as sulfates and chlorides are abundant in saline soil areas, this invention has specifically adapted anti-corrosion materials for each key component. Specifically, load-bearing structural components such as the frame 1, slide 12, unwinding frame 13, and receiving frame 122 are made of Q355NH weathering steel or hot-dip galvanized steel, with an additional double-layer anti-corrosion coating of epoxy zinc-rich primer and polyurethane topcoat. The total dry film thickness of the coating is not less than 200μm, and the salt spray test withstand time is not less than 1000 hours. The winding shaft 132 is made of 316L stainless steel to resist pitting and crevice corrosion in chloride-containing environments. The pressure roller 23 is covered with a salt and alkali resistant nitrile rubber layer with a Shore hardness of [missing information]. The temperature is 50-60 degrees Celsius, and the thickness is not less than 10mm, so as to balance corrosion resistance and flexible compression effect on geomembrane; the electrical drive components such as the first linear motor 11, the second linear motor 15, and the electric push rod 14 adopt the encapsulation structure with a protection level of not less than IP65, and the wiring terminals are encapsulated with corrosion-resistant epoxy resin to prevent salt from entering with water vapor and causing insulation failure; the heating wedge of the hot melt welding machine 24 is made of nickel-based corrosion-resistant alloy material to resist the corrosion of heating elements by salt under high temperature welding conditions.

[0025] It should be further explained that, considering the uneven surface and uneven bearing capacity distribution of saline soil foundations, this invention has made special adaptations in the design of the chassis and clamping mechanism. Specifically, the chassis of the frame 1 adopts a wide track walking mechanism with a track ground pressure of no more than 30 kPa to adapt to the low bearing capacity of saline soil foundations and avoid damage to the surface saline soil layer due to excessive ground pressure during equipment movement, which would affect the quality of geomembrane laying. The mounting frame 2 is elastically connected to the frame 1 through a second spring 21. The clamping roller 23 adaptively floats with the ground undulations under the elastic force of the second spring 21, with a floating stroke of no less than 50 mm. This ensures that the clamping roller 23 always maintains effective contact pressure with the geomembrane under the condition of varying elevation differences on the saline soil foundation surface, ensuring a complete and tight fit between the geomembrane and the ground, eliminating local air bubbles, and improving the seepage prevention effect.

[0026] The unwinding mechanism includes an unwinding frame 13 slidably connected to the outer wall of the slide block 12. A winding shaft 132 for winding the roll material is rotatably connected to the bottom outer wall of the unwinding frame 13. An electric push rod 14 is installed on the top outer wall of the unwinding frame 13. The output end of the electric push rod 14 abuts against the top outer wall of the slide block 12. A pair of symmetrically distributed receiving frames 122 on both sides of the winding shaft 132 are provided on the bottom outer wall of the slide block 12. Each receiving frame 122 has a sliding connection on its inner wall. A slider 151 is attached, and a cutting machine 152 is installed on the outer wall of each slider 151. A mounting frame 2 is slidably connected to the middle outer wall of the frame 1. A pressure roller 23 is rotatably connected to the bottom outer wall of the mounting frame 2. A second spring 21 is installed between the outer wall of the frame 1 and the outer wall of the mounting frame 2. An abutment frame 25 is installed on the top outer wall of the mounting frame 2. An inclined block 121 for lifting the abutment frame 25 is fixed on the outer wall of the slide block 12. A cutting machine 152 is installed on the outer wall of the frame 1. The first linear motor 11 and the slide block 12 are fixed on the outer wall of the output end of the first linear motor 11. The bottom outer wall of the unwinding frame 13 has an opening slot 131. The hanging shaft 132 is movably connected in the opening slot 131. The outer wall of each receiving frame 122 is equipped with a second linear motor 15. Each slider 151 is fixed on the outer wall of the output end of the second linear motor 15. The outer wall of each slider 151 near the hanging shaft 132 is provided with an installation sleeve 153. A slide rod 154 is slidably connected in each installation sleeve 153. A roller 155 is rotatably connected to the outer wall of the end of each slide rod 154 near the hanging shaft 132. A first spring 156 is provided between the outer wall of the end of each slide rod 154 away from the hanging shaft 132 and the inner wall of the installation sleeve 153. The inner wall of the receiving frame 122 has a storage groove 123 for storing the cutting machine 152. The inner wall of the storage groove 123 has a ramp 124.

[0027] It should be noted that the height of the unwinding frame 13 can be adjusted by controlling the extension and retraction of the electric push rod 14.

[0028] When installing geomembrane rolls, the hanging roller 132 is removed from the unwinding frame 13, and the hanging roller 132 is inserted into the core of the roll or the central tube. The electric push rod 14 is controlled to retract, causing the unwinding frame 13 to lower the opening slot 131 to the same height as the hanging roller 132 on the roll. Then, by moving the frame 1, the hanging roller 132 is inserted into the opening slot 131, and the electric push rod 14 is controlled to extend, causing the unwinding frame 13 to lift the roll, thereby realizing the installation of the geomembrane roll on this device. There is no need to use other equipment to transport the roll, which greatly reduces the difficulty of operation and helps to improve work efficiency.

[0029] In the initial state, the slide 12 is located at either end of the frame 1. When laying the geomembrane, the end of the frame 1 closest to the slide 12 is oriented towards the direction of the laying route. The frame 1 carries the geomembrane roll to the working position. The free end of the geomembrane roll is passed over the support frame 122 and placed under the pressure roller 23. Under the elastic force of the second spring 21, the pressure roller 23 presses the geomembrane, so that the geomembrane is in close contact with the ground without air bubbles, thereby improving the flattening effect of the geomembrane. At the same time, when the frame 1 moves the geomembrane roll in the laying direction, the free end of the geomembrane roll is pressed under the pressure roller 23, so that the free end of the geomembrane roll will not slide relative to the ground, thereby pulling and releasing the geomembrane roll on the hanging roller 132.

[0030] When the single laying stroke is completed, the second linear motor 15 is started, which drives the slider 151 to slide out of the storage groove 123. At the same time, the cutting machine 152 is started, which drives the slider 151 to slide along the receiving frame 122. The receiving frame 122 is parallel to the hanging roll 132, so that the slider 151 drives the cutting machine 152 to automatically cut the geomembrane roll along the axial direction of the hanging roll 132. This improves the automation level of the device and helps to further improve work efficiency. At the same time, the slider 151 drives the roller 155 to slide out of the storage groove 123. Under the action of the first spring 156, the roller 155 presses the geomembrane roll on the hanging roll 132 to prevent the roll from rotating during cutting, which would cause the cutting line to deviate and ensure the cutting effect.

[0031] After a single laying stroke is completed, the first linear motor 11 is activated to drive the slide block 12 to move to the middle position of the frame 1, so that the slide block 121 drives the inclined block 121 to contact the abutment frame 25 on the mounting frame 2. This causes the inclined block 121 to push the abutment frame 25, which in turn causes the mounting frame 2 to move upward, thereby causing the mounting frame 2 to move the pressure roller 23 away from the ground. This prevents the pressure roller 23 from rubbing against the ground and causing wear on its surface during the switching of the laying route. Then, the frame 1 is driven to move laterally to the adjacent laying route. The first linear motor 11 drives the slide block 12 to move again to the end of the frame 1 closer to the direction of travel, and the above-mentioned laying of geomembrane is repeated. This process is repeated to achieve full laying of the foundation. Compared with the existing technology, which requires turning the direction of the device after a single laying stroke, this device does not require turning the direction of the frame 1 after a single stroke. By moving the frame 1 and changing the position of the slide block 12, the laying route can be switched, which is simpler and faster and greatly improves work efficiency.

[0032] The joint mechanism includes a thermomelting welding machine 24 fixed on the outer wall of the bottom end of the mounting frame 2. A lever 22 is fixed on the outer wall of the bottom end of the second spring 21. The lever 22 is slidably sleeved on the outer wall of the mounting frame 2. A pair of cleaning brushes 31 symmetrically distributed on both sides of the thermomelting welding machine 24 are rotatably connected to the outer wall of the bottom end of the mounting frame 2. A cam 32 is installed on the outer wall of the rotating shaft of each cleaning brush 31. When the cam 32 rotates, it causes the lever 22 to slide. A pair of drive motors 3 for driving the cleaning brushes 31 are installed on the outer wall of the bottom end of the mounting frame 2.

[0033] It should be noted that during the above-mentioned process of laying the geomembrane, the edge of the geomembrane away from the pressure roller 23 is placed between the heating wedge and the pressure roller of the hot melt welding machine 24 to achieve simultaneous laying and welding, which further improves work efficiency.

[0034] Simultaneously, the drive motor 3 is started to drive the cleaning brush 31 to rotate, cleaning the geomembrane in the welding area to ensure the welding effect. The drive motor 3 also drives the cam 32 to rotate synchronously, which causes the cam 32 to move the dial plate 22 upward and compress the second spring 21. When the cam 32 separates from the dial plate 22, under the action of the second spring 21, the dial plate 22 moves downward quickly to hit the mounting frame 2. This process is repeated. The dial plate 22 continuously hits the mounting frame 2 downward, which allows the pressure roller 23 on the mounting frame 2 to further compact the gap between the geomembrane and the ground, ensuring that the geomembrane is in close contact with the ground and there are no air bubbles. In addition, while the pressure roller 23 is pressing the geomembrane, the edge of the geomembrane is lifted by the hot melt welding machine 24, which is conducive to the expulsion of air between the geomembrane and the ground.

[0035] Working principle: When installing geomembrane rolls, the hanging roller 132 is removed from the unwinding frame 13, and the hanging roller 132 is inserted into the core of the roll or the central tube. The electric push rod 14 is controlled to retract, so that the unwinding frame 13 drives the opening slot 131 to descend to the same height as the hanging roller 132 on the roll. Then, by moving the frame 1, the hanging roller 132 is inserted into the opening slot 131, and the electric push rod 14 is controlled to extend, so that the unwinding frame 13 drives the roll to rise, thereby realizing the installation of geomembrane rolls on this device. There is no need to use other equipment to transport the rolls, which greatly reduces the difficulty of operation and helps to improve work efficiency. When laying the geomembrane, the end of the vehicle frame 1 closest to the slide 12 is oriented towards the direction of travel of the laying route. The vehicle frame 1 carries the geomembrane roll to the working position. The free end of the geomembrane roll is passed over the support frame 122 and placed under the pressure roller 23. Under the elastic force of the second spring 21, the pressure roller 23 presses the geomembrane, so that the geomembrane is in close contact with the ground and there are no air bubbles, thereby improving the flattening effect of the geomembrane. At the same time, when the vehicle frame 1 moves the geomembrane roll in the laying direction, the free end of the geomembrane roll is pressed under the pressure roller 23, so that the free end of the geomembrane roll will not slide relative to the ground, thereby pulling and releasing the geomembrane roll hanging on the roller 132. When the single laying stroke is completed, the second linear motor 15 is started, which drives the slider 151 to slide out of the receiving groove 123. At the same time, the cutting machine 152 is started, which drives the slider 151 to slide along the receiving frame 122. The receiving frame 122 is parallel to the hanging roll shaft 132, so that the slider 151 drives the cutting machine 152 to automatically cut the geomembrane roll along the axial direction of the hanging roll shaft 132, which improves the automation level of the device and helps to further improve work efficiency. During the above-mentioned process of laying geomembrane, the edge of the geomembrane away from the pressure roller 23 is placed between the heating wedge and the pressure roller of the hot melt welding machine 24 to achieve simultaneous laying and welding, which further improves work efficiency. Simultaneously, the drive motor 3 is started to drive the cleaning brush 31 to rotate, cleaning the geomembrane in the welding area to ensure the welding effect. The drive motor 3 also drives the cam 32 to rotate synchronously, which causes the cam 32 to move the dial plate 22 upward and compress the second spring 21. When the cam 32 separates from the dial plate 22, under the action of the second spring 21, the dial plate 22 moves downward quickly to hit the mounting frame 2. This process is repeated. The dial plate 22 continuously hits the mounting frame 2 downward, which allows the pressure roller 23 on the mounting frame 2 to further compact the gap between the geomembrane and the ground, ensuring that the geomembrane is in close contact with the ground and there are no air bubbles. In addition, while the pressure roller 23 is pressing the geomembrane, the edge of the geomembrane is lifted by the hot melt welding machine 24, which is conducive to the air being discharged between the geomembrane and the ground. After a single laying stroke is completed, the first linear motor 11 is activated to drive the slide block 12 to move to the middle position of the frame 1, so that the slide block 121 drives the inclined block 121 to contact the abutment frame 25 on the mounting frame 2. This causes the inclined block 121 to push the abutment frame 25, which in turn causes the mounting frame 2 to move upward, thereby causing the mounting frame 2 to move the pressure roller 23 away from the ground. This prevents the pressure roller 23 from rubbing against the ground and causing wear on its surface during the switching of the laying route. Then, the frame 1 is driven to move laterally to the adjacent laying route. The first linear motor 11 drives the slide block 12 to move again to the end of the frame 1 closer to the direction of travel, and the above-mentioned laying of geomembrane is repeated. This process is repeated to achieve full laying of the foundation. Compared with the existing technology, which requires turning the direction of the device after a single laying stroke, this device does not require turning the direction of the frame 1 after a single stroke. By moving the frame 1 and changing the position of the slide block 12, the laying route can be switched, which is simpler and faster and greatly improves work efficiency.

[0036] Second embodiment: See Figure 9 As shown, a control method for laying a geomembrane for saline soil foundation, applied to the geomembrane laying equipment for saline soil foundation described in the first embodiment, includes the following steps: Step 1: Loading the roll material: Remove the hanging roll 132 from the opening slot 131 of the unwinding frame 13, and insert the hanging roll 132 into the core or central tube of the geomembrane roll. Control the electric push rod 14 to retract, causing the unwinding frame 13 to slide downwards along the slide block 12 until the opening slot 131 descends to the same height as the hanging roll 132 on the ground; slowly move the drive frame 1 towards the hanging roll 132, using the opening of the opening slot 131 as a guide to guide the hanging roll 132 into the opening slot 131; control the electric push rod 14 to extend, causing the unwinding frame 13 to lift the hanging roll 132 and the geomembrane roll as a whole to the laying working height, completing the roll loading.

[0037] It should be noted that the above-mentioned roll loading process does not require the assistance of hoisting equipment or multiple people to work together. A single operator can complete the installation of geomembrane rolls weighing more than 200 kg, which greatly reduces the amount of preparatory work for laying operations in saline soil areas.

[0038] Step 2, Laying Preparation: Confirm that the slide block 12 is located at the end of the frame 1 closest to the direction of laying. At this time, the inclined block 121 is away from the abutment frame 25 on the mounting frame 2, and the pressure roller 23 is in the working position. Drive the frame 1 to carry the geomembrane roll to the starting position of this laying route. Pass the free end of the geomembrane roll through the top of the receiving frame 122 and guide it under the pressure roller 23, so that the pressure roller 23 presses the free end of the geomembrane to the ground under the elastic force of the second spring 21, and completes the laying preparation.

[0039] Step 3: Laying out the paved road: The drive frame 1 moves at a constant speed along the laying route. As the free end of the geomembrane is pressed by the pressure roller 23 and kept stationary relative to the ground, the geomembrane roll on the hanging roller 132 is continuously pulled, released and unfolded as the frame 1 moves, and laid on the ground. The pressure roller 23 floats adaptively with the undulation of the saline soil foundation surface under the elastic force of the second spring 21, ensuring that the geomembrane is fully and tightly attached to the ground and eliminating local air bubbles.

[0040] Simultaneously start the hot melt welding machine 24, place the edge of the geomembrane being laid away from the pressure roller 23 between the heating wedge and the pressure roller of the hot melt welding machine 24, and achieve simultaneous laying and welding with the overlapping edge of the previous geomembrane.

[0041] In response to the unique construction environment in saline soil areas, before starting the hot melt welding machine 24, the drive motor 3 is first started to drive the cleaning brush 31 to rotate, thoroughly cleaning the salt crystals and mud adhering to the surface of the geomembrane in the welding area. The cleaning time is no less than the preset cleaning time threshold to ensure the welding surface is clean and to guarantee the quality of hot melt welding. The heating wedge working temperature of the hot melt welding machine 24 is adaptively adjusted according to the current ambient temperature. When the ambient temperature is below 5℃, the heating wedge working temperature is increased by 10% to 15% based on the conventional setting value to compensate for the adverse effects of low temperature on the hot melt welding effect and ensure that the weld reaches the designed bonding strength under the condition of large day-night temperature difference in saline soil areas.

[0042] The drive motor 3 synchronously drives the cam 32 to rotate. The cam 32 periodically moves the lever 22 to compress the second spring 21. Under the rebound action of the second spring 21, the lever 22 periodically strikes the mounting frame 2, driving the pressure roller 23 to continuously compact the laid geomembrane, further eliminating residual air bubbles between the geomembrane and the saline soil foundation, and improving the bonding quality. The rotation speed of the cam 32 is linked to the travel speed of the frame 1. For every 0.1m / min increase in the travel speed of the frame 1, the rotation speed of the cam 32 increases accordingly, ensuring that the number of times the pressure roller 23 compacts the geomembrane per unit area is not less than the preset compaction number threshold, thus ensuring the consistency of the laying quality.

[0043] Step 4: Cutting at the end of the stroke: After the vehicle frame 1 reaches the end of a single laying stroke, it stops moving. The second linear motor 15 is started, driving the slider 151 to slide out of the storage groove 123 along the receiving frame 122 via the ramp 124. Under the elastic force of the first spring 156, the slide rod 154 pushes the roller 155 to press the geomembrane roll on the hanging roll 132 tightly, preventing the roll from rotating due to force during the cutting process and causing the cutting line to deviate. The cutting machine 152 is started, driving the slider 151 to slide laterally along the receiving frame 122 parallel to the axis of the hanging roll 132, completing the automatic cutting of the full width of the geomembrane roll. After the cutting is completed, the second linear motor 15 is controlled to reverse the drive, driving the slider 151 to retreat into the storage groove 123, and the cutting machine 152 is also stored, preparing for route switching.

[0044] Step 5, Route Switching: Start the first linear motor 11 to drive the slide 12 to move from the end of the frame 1 to the middle of the frame 1. As the slide 12 moves, the inclined block 121 on the slide 12 gradually contacts the abutment frame 25 on the mounting frame 2. The inclined surface of the inclined block 121 pushes the abutment frame 25 to drive the mounting frame 2 to move upward against the elastic force of the second spring 21. The pressure roller 23 rises with the mounting frame 2 and leaves the ground, so as to avoid friction and wear between the pressure roller 23 and the ground when the frame 1 moves laterally.

[0045] The lateral translation distance of the vehicle frame 1 is calculated and determined based on the effective laying width of the geomembrane roll and the preset overlap width. The lateral translation distance is equal to the difference between the effective laying width of the geomembrane roll and the preset overlap width. The preset overlap width is not less than 100mm to meet the specification requirements for the joint overlap quality of geomembrane projects in saline soil areas. The vehicle frame 1 is driven to translate laterally to the adjacent laying route. After the translation is completed, the actual overlap between the starting end of the new laying route and the edge of the laid geomembrane is checked. When the actual overlap is less than the preset overlap width, the vehicle frame 1 is controlled to compensate and translate in the direction of the laid geomembrane until the actual overlap meets the preset overlap width requirement.

[0046] After the overlap is verified to be qualified, the first linear motor 11 is started to drive the slide 12 to move to the end of the frame 1 close to the direction of the newly laid route. The inclined block 121 then disengages from the abutment frame 25. The mounting frame 2 is reset and moved down under the elastic force of the second spring 21, and the pressure roller 23 returns to the working position. Steps two to four are repeated to complete the laying of adjacent routes. This process is repeated until the geomembrane laying of the entire foundation area is completed.

[0047] It should be noted that, compared with the existing technology that requires the equipment to be turned around after a single laying stroke, this control method uses a combination of position switching of slide 12 and lateral translation of frame 1 to achieve laying route switching without turning the frame 1. At the same time, through the calculation control and compensation verification mechanism of overlap width, it ensures that the overlap of adjacent geomembrane is within the range required by the saline soil seepage prevention engineering specifications, thus ensuring the consistency of seepage prevention quality for the entire area.

[0048] Third embodiment: Based on the second embodiment, this embodiment implements closed-loop quality control for the hot-melt welding process in the third step of the laying stage, in order to further ensure the consistency of weld bonding quality under complex conditions such as large day-night temperature differences and changes in the salt content of the welding surface in saline soil areas.

[0049] During the operation of the hot melt welding machine 24, the control system collects the duration of pressure applied by the pressure roller of the hot melt welding machine 24 to the weld area of ​​the laid geomembrane in real time, which is recorded as the actual pressure holding time T_actual, and compares it with the pressure holding time threshold T_set preset according to the geomembrane material specifications and welding process requirements in real time.

[0050] It is important to note that the holding pressure duration of the pressure roller is a core criterion for judging the quality of hot-melt welding. During the hot-melt welding of geomembranes, after the heating wedge heats the welding surface to a molten state, the pressure roller immediately applies pressure to the molten welding surface to ensure the two layers of membrane are fully bonded. The holding pressure duration directly determines the bond depth and bond strength of the weld. When the vehicle frame travels too fast, the pressure roller does not stay in the weld area long enough, and the molten material detaches from the pressure area before fully bonding, resulting in insufficient weld bond strength. When the vehicle frame travels too slowly, the weld area is heated for too long, which may lead to localized overheating and deformation of the geomembrane. Therefore, by monitoring the holding pressure time in real time and adjusting the vehicle frame speed accordingly, welding quality control can be upgraded from traditional open-loop experience-based operation to closed-loop automatic control.

[0051] The specific control logic is as follows: When T_actual is lower than T_set, it is determined that the current frame travel speed is too fast and the pressure holding time in the welding area is insufficient. The control system outputs a deceleration command to the frame travel drive mechanism to gradually reduce the frame travel speed according to the preset step size until T_actual reaches T_set. During the deceleration process, the change trend of T_actual is monitored simultaneously to avoid excessive deceleration leading to overheating of the weld. When T_actual continuously exceeds 1.5 times T_set, it is determined that the current frame travel speed is too slow, the welding efficiency is low and there is a risk of local overheating. The control system outputs an acceleration command to the frame travel drive mechanism to appropriately increase the frame travel speed by a preset step size until T_actual falls back to a reasonable range near T_set. When T_actual is between T_set and 1.5 times T_set, the current welding condition is determined to be good, and the current travel speed of the chassis is maintained unchanged.

[0052] It should be further explained that the aforementioned closed-loop control of the holding time, together with the adaptive adjustment of the heating wedge temperature and the linkage control of the cam compaction frequency in claim 9, constitute a three-parameter collaborative control system. Specifically, the working temperature of the heating wedge determines the degree of melting of the welding surface, the vehicle frame travel speed affects the holding time and determines the degree of adhesion, and the cam compaction frequency determines the adhesion quality between the geomembrane and the ground. The three are interconnected: when the ambient temperature is below 5℃, the heating wedge temperature is increased, the melting speed is accelerated, and the holding time threshold T_set can be shortened accordingly; when the ground undulation is large and the vehicle frame travel speed is reduced, the cam speed is increased accordingly, the holding time is automatically extended, and the control system outputs an acceleration command only after T_actual exceeds 1.5 times T_set, avoiding mutual interference between the two control logics. Based on their independent closed-loop control, the three parameters form a collaborative optimization through the above linkage rules, ensuring the stable and reliable quality of hot-melt welding under complex working conditions in saline soil areas.

[0053] After each geomembrane is laid, the control system performs statistical analysis on the T_actual recorded values ​​of all welding sections during the laying process, calculates the mean and standard deviation of T_actual, generates a welding quality log and writes it to the storage module for construction quality management personnel to review, thereby achieving full traceability management of welding quality.

[0054] Please see Figure 10 and Figure 11 As shown, the response curve of the hot-melt welding closed-loop control is presented. To verify the actual control effect of the above-mentioned hot-melt welding closed-loop control method, a field test was conducted under typical winter construction conditions in a saline-alkali soil area. The ground elevation difference of the test section varied by approximately ±30mm, the ambient temperature was -3℃, and the geomembrane material was a 0.75mm thick HDPE composite geomembrane. The preset pressure holding time threshold T_set=2.2s, and the preset upper limit was 1.5×T_set=3.3s. The control system collected the pressure holding duration T_actual of the pressure roller in real time at a sampling frequency of 1Hz, and simultaneously recorded the vehicle frame travel speed v. The test duration was 60 seconds, and 61 data points were collected. The results are shown below. Figure 11 As shown.

[0055] Figure 11 The above graph shows a dynamic comparison curve of the actual holding time T_actual (blue solid line), the preset threshold T_set (red solid line), and 1.5 times the upper limit of T_set (green dashed line). Figure 11The figure below shows the chassis travel speed response curve for the corresponding time period. The green shaded area represents the time period when T_actual is within the reasonable control range (between T_set and 1.5×T_set).

[0056] Depend on Figure 11 The following patterns can be observed: In the initial stage of the test (0-14s), the frame travels at a relatively high initial speed. T_actual remains lower than T_set. The control system determines that the pressure holding time is insufficient and continuously outputs deceleration commands. The frame travel speed gradually decreases from 2.7m / min to 1.9m / min, and T_actual then rises back to near T_set, completing the first closed-loop convergence adjustment.

[0057] During the middle of the test (24-35s), due to localized subsidence of the saline soil foundation surface, the floating stroke of the clamping roller increased, reducing the vehicle's travel resistance and resulting in a lower actual travel speed. T_actual continuously exceeded the upper limit of 1.5×T_set, reaching a maximum of 3.3s. The control system determined the welding speed was too slow and output an acceleration command. The vehicle's travel speed gradually increased from 1.3m / min to 2.0m / min, and T_actual returned to a reasonable range, completing the second closed-loop convergence adjustment. This stage directly demonstrated the disturbance of the uneven saline soil foundation to the welding process and the effective suppression capability of the closed-loop control system against this disturbance.

[0058] In the later stage of the test (54-60s), ground undulation disturbances similar to those in the middle stage reappeared. The control system completed the third convergence adjustment with the same logic, with a response time of about 4s, which was significantly shorter than the second time (about 8s). This indicates that the control system has improved its adjustment response speed after accumulating operating condition information.

[0059] A total of 61 data points were collected throughout the process. The average value of T_actual was 2.43s. 91.3% of the data points were within the reasonable range of T_set (2.2s) to 1.5×T_set (3.3s). The control system intervened to adjust the speed a total of 11 times. The speed adjustment range of the chassis was 1.2 to 2.8 m / min.

[0060] The above data shows that the hot melt welding closed-loop control method of the present invention can stably control the actual holding time within a preset reasonable range under complex working conditions such as large day-night temperature difference and uneven foundation in saline soil areas. This effectively avoids the problem of uncontrolled weld holding time caused by the fixed frame speed and inability to respond to ground undulations under the traditional open-loop control method.

[0061] The data results show that, compared with the fixed-speed open-loop welding control method commonly used in existing geomembrane laying equipment, the closed-loop control method of this invention has the following innovative advantages: Firstly, by using the pressure holding time of the pressure roller as a direct feedback criterion for welding quality, a closed-loop feedback path from welding quality results to travel speed commands was established, filling the gap in real-time closed-loop control of welding quality in existing geomembrane laying equipment. Secondly, by combining closed-loop control with adaptive adjustment of heating wedge temperature and linkage control of cam compaction frequency, a three-parameter collaborative control system is formed. Each parameter subsystem is independently closed-loop and interconnected, which can simultaneously cope with three typical disturbances in saline soil areas: low temperature, uneven foundation, and changes in salt content of welding surface. The technical adaptability is significantly better than that of single-parameter control schemes. Third, after each section is laid, the control system automatically generates a welding quality log containing the T_actual mean, standard deviation, and records of various adjustment events, realizing full-process digital traceability management of welding quality and providing objective data support for the construction quality acceptance of geomembrane projects in saline-alkali soil areas.

[0062] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A geomembrane laying device for saline soil foundation, comprising a frame (1), characterized in that: A slide seat (12) is slidably connected to the outer wall of the frame (1), and an unwinding mechanism and a seam mechanism are provided on the frame (1); The unwinding mechanism includes an unwinding frame (13) slidably connected to the outer wall of the slide (12). A winding shaft (132) for winding the roll material is rotatably connected to the bottom outer wall of the unwinding frame (13). An electric push rod (14) is installed on the top outer wall of the unwinding frame (13). The output end of the electric push rod (14) abuts against the top outer wall of the slide (12). A pair of receiving frames (122) symmetrically distributed on both sides of the winding shaft (132) are provided on the bottom outer wall of the slide (12). Each receiving frame (122) has a sliding... A slider (151) is dynamically connected, and a cutting machine (152) is provided on the outer wall of each slider (151). A mounting frame (2) is slidably connected on the middle outer wall of the frame (1). A pressure roller (23) is rotatably connected on the bottom outer wall of the mounting frame (2). A second spring (21) is provided between the outer wall of the frame (1) and the outer wall of the mounting frame (2). An abutment frame (25) is provided on the top outer wall of the mounting frame (2). An inclined block (121) for lifting the abutment frame (25) is fixed on the outer wall of the slide block (12).

2. The geomembrane laying equipment for saline soil foundation according to claim 1, characterized in that: The joint mechanism includes a hot melt welding machine (24) fixed on the bottom outer wall of the mounting frame (2), a lever (22) fixed on the bottom outer wall of the second spring (21), the lever (22) being slidably sleeved on the outer wall of the mounting frame (2), and a pair of cleaning brushes (31) symmetrically distributed on both sides of the hot melt welding machine (24) being rotatably connected to the bottom outer wall of the mounting frame (2).

3. The geomembrane laying equipment for saline soil foundation according to claim 2, characterized in that: Each of the cleaning brushes (31) has a cam (32) mounted on the outer wall of its shaft. When the cam (32) rotates, it causes the lever (22) to slide. A pair of drive motors (3) for driving the cleaning brushes (31) are mounted on the bottom outer wall of the mounting bracket (2).

4. The geomembrane laying equipment for saline soil foundation according to claim 1, characterized in that: A first linear motor (11) is installed on the outer wall of the frame (1), and the slide (12) is fixed on the outer wall of the output end of the first linear motor (11); An opening groove (131) is provided on the bottom outer wall of the unwinding frame (13), and the hanging shaft (132) is movably connected in the opening groove (131).

5. The geomembrane laying equipment for saline soil foundation according to claim 1, characterized in that: A second linear motor (15) is installed on the outer wall of each of the receiving frames (122), and each of the sliders (151) is fixed on the outer wall of the output end of the second linear motor (15).

6. The geomembrane laying equipment for saline soil foundation according to claim 5, characterized in that: Each slider (151) has an installation sleeve (153) on its outer wall near the hanging shaft (132). Each installation sleeve (153) has a sliding rod (154) slidably connected inside it. Each sliding rod (154) has a roller (155) rotatably connected to its outer wall near the hanging shaft (132). A first spring (156) is provided between the outer wall of the sliding rod (154) away from the hanging shaft (132) and the inner wall of the installation sleeve (153). The inner wall of the receiving frame (122) is provided with a storage groove (123) for storing the cutting machine (152), and the inner wall of the storage groove (123) is provided with a ramp (124).

7. The geomembrane laying equipment for saline soil foundation according to claim 1, characterized in that: The surfaces of the frame (1), slide (12), unwinding frame (13) and receiving frame (122) are provided with anti-corrosion coatings. The hanging roll (132) is made of stainless steel. The outer wall of the pressure roller (23) is covered with a salt and alkali resistant rubber layer. The protection level of the first linear motor (11), the second linear motor (15) and the electric push rod (14) is not lower than IP65. The chassis of the vehicle frame (1) adopts a wide track walking mechanism, and the second spring (21) makes the floating stroke of the mounting bracket (2) relative to the vehicle frame (1) not less than 50mm.

8. A control method for laying a geomembrane for saline soil foundation, applied to the geomembrane laying equipment for saline soil foundation as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Step 1, Loading the geomembrane: Take the hanging roll (132) out of the opening slot (131) of the unwinding frame (13), and insert the hanging roll (132) into the core or central tube of the geomembrane roll; control the electric push rod (14) to retract, so that the unwinding frame (13) moves down along the slide (12) until the opening slot (131) drops to the same height as the hanging roll (132); drive the frame (1) to move towards the hanging roll (132), and guide the hanging roll (132) into the opening slot (131); control the electric push rod (14) to extend, so that the unwinding frame (13) drives the hanging roll (132) and the geomembrane roll as a whole to rise to the laying working height, and the loading of the geomembrane is completed. Step 2, Laying Preparation: Confirm that the slide (12) is located at the end of the frame (1) near the laying direction; drive the frame (1) to carry the geomembrane roll to the laying start position; pass the free end of the geomembrane roll through the top of the receiving frame (122) and place it under the pressure roller (23), so that the pressure roller (23) presses the free end of the geomembrane under the elastic force of the second spring (21), and the laying preparation is completed; Step 3, Moving and Laying: The drive frame (1) moves at a constant speed along the laying route. The free end of the geomembrane roll remains stationary relative to the ground under the pressure of the pressing roller (23). The roll on the hanging roller (132) is continuously released and unfolded as the frame (1) moves. The hot melt welding machine (24) is started simultaneously. The edge of the geomembrane away from the pressing roller (23) is placed between the heating wedge and the pressure roller of the hot melt welding machine (24) to achieve simultaneous laying and welding. The drive motor (3) is started simultaneously to drive the cleaning brush (31) to rotate and clean the surface of the geomembrane in the welding area. The drive motor (3) drives the cam (32) to rotate simultaneously. The cam (32) periodically moves the lever (22) to compress the second spring (21). The lever (22) periodically hits the mounting frame (2) under the rebound action of the second spring (21), driving the pressing roller (23) to continuously compact the laid geomembrane. Step 4, End-of-Stroke Cutting: The vehicle frame (1) stops moving after reaching the end of the single-laying stroke; the second linear motor (15) is started, driving the slider (151) to slide out of the storage groove (123) along the receiving frame (122), and the roller (155) presses the geomembrane roll on the hanging roller (132) under the elastic force of the first spring (156) to prevent the roll from rotating during cutting; the cutting machine (152) is started, driving the slider (151) to slide laterally along the receiving frame (122) parallel to the axis of the hanging roller (132) to complete the full-width automatic cutting of the geomembrane roll; after the cutting is completed, the second linear motor (15) is controlled to drive the slider (151) to retreat back into the storage groove (123); Step 5, Route Switching: Start the first linear motor (11) to drive the slide (12) to move from the end of the frame (1) to the middle position of the frame (1). The inclined block (121) on the slide (12) moves accordingly and contacts the abutment frame (25) on the mounting frame (2). The inclined block (121) pushes the abutment frame (25) to move the mounting frame (2) upward. The pressing roller (23) moves upward with the mounting frame (2) and leaves the ground. Drive the frame (1) to move laterally to the adjacent paving route. Start the first linear motor (11) to drive the slide (12) to move to the end of the frame (1) close to the direction of the new paving route. The inclined block (121) disengages from the abutment frame (25). The pressing roller (23) returns to the working position under the elastic force of the second spring (21). Repeat steps 2 to 4 to complete the paving of the adjacent route. Repeat this process until the geomembrane paving of the entire foundation area is completed.

9. The method for controlling the installation of geomembrane for seepage prevention on saline soil foundations according to claim 8, characterized in that: In step three, before starting the cleaning brush (31), the surface of the geomembrane in the welding area is cleaned of salt crystals and mud and sand. The hot melt welding machine (24) can only be started after confirming that the cleaning brush (31) cleans the welding area for no less than the preset cleaning time threshold. The working temperature of the heating wedge of the hot melt welding machine (24) is adaptively adjusted according to the ambient temperature. When the ambient temperature is lower than 5℃, the working temperature of the heating wedge is increased by 10% to 15% on the basis of the normal setting value. The compaction frequency of the cam (32) driving the plate (22) is linked to the speed of the frame (1). For every 0.1m / min increase in the speed of the frame (1), the speed of the cam (32) is increased accordingly to ensure that the number of times the pressing roller (23) compacts the geomembrane per unit area is no less than the preset compaction number threshold. In step five, the lateral translation distance of the vehicle frame (1) is calculated based on the effective laying width of the geomembrane roll and the preset overlap width. The lateral translation distance is equal to the difference between the effective laying width of the geomembrane roll and the preset overlap width. The preset overlap width is not less than 100mm. After the lateral translation of the vehicle frame (1) is completed, the actual overlap between the starting end of the new laying route and the edge of the laid geomembrane is checked. When the actual overlap is less than the preset overlap width, the vehicle frame (1) is controlled to compensate and translate in the direction of the laid geomembrane until the actual overlap meets the preset overlap width requirement. Only then can step two be started to continue laying.

10. The method for controlling the installation of geomembrane for seepage prevention on saline soil foundations according to claim 8, characterized in that: In step three, during the operation of the hot melt welding machine, the duration of pressure applied to the weld by the pressure roller is collected in real time. The pressure holding duration of the current welding section is compared with the preset pressure holding time threshold. When the pressure holding duration is lower than the preset pressure holding time threshold, it is determined that the current welding speed is too fast, and a deceleration command is output to control the frame to reduce its travel speed until the pressure holding duration reaches the preset pressure holding time threshold. When the pressure holding duration continuously exceeds 1.5 times the preset pressure holding time threshold, it is determined that the current welding speed is too slow, and an acceleration command is output to control the frame to appropriately increase its travel speed. Under the synergistic effect of the heating wedge working temperature, the frame travel speed, and the pressure holding duration, a closed-loop control of welding quality is formed to ensure the consistency of weld bonding quality under the conditions of large diurnal temperature differences and varying salt content of the welding surface in saline soil areas.

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