Vacuum preloading sealing film laying device for dredger fill roadbed

Abstract

The invention belongs to the technical field of roadbed vacuum preloading construction equipment, solves the problems that in the prior art, film laying operation is low in efficiency and poor in quality, a film is prone to being damaged, and film heat seal welding operation is not facilitated, and provides a vacuum preloading sealing film laying device for a dredger fill roadbed. The splicing direction of every two adjacent sealing films is the width direction, belt releasing rollers are arranged at the two ends of the movable frame, flat belts are wound around the belt releasing rollers, anchoring holes are formed in the two ends of each flat belt, connecting arms are rotationally installed at the outer side ends of the belt releasing rollers, and the top ends of the connecting arms are rotationally connected with the movable frame. When the sealing film is laid, the flat belt located on the downstream portion is supported at the bottom of the front side edge of the sealing film, the flat belt located on the upstream portion is pressed at the top of the rear side edge of the sealing film, the film laying efficiency and quality are improved through the moving frame and the film releasing roller of the device, and the film heat sealing welding efficiency and quality are improved through the flat belts.

Description

Technical Field

[0001] This invention relates to the technical field of roadbed vacuum preloading construction equipment, specifically to a device for laying a sealing membrane for vacuum preloading of fill roadbed. Background Technology

[0002] In vacuum preloading construction of fill (or hydraulic fill) subgrades, the sealing membrane is the core component that determines the success or failure of the entire process. Its most fundamental purpose is to form a complete and sealed "negative pressure chamber" on the surface of the reinforced soft soil foundation. Due to the large area covered in a single construction operation, the laying of the sealing membrane becomes a major project. Currently, the laying of the sealing membrane is usually carried out by multiple people working together, pushing the membrane roll to roll or pulling the membrane end to release it. This is not only time-consuming and laborious, but also very easy to damage the sealing membrane. In particular, the quality of sealing membrane installation relies heavily on the workers' skill level and the coordination between them. This makes it difficult to control the quality of the installation effectively and reasonably, often requiring adjustments after installation. However, the sealing membrane is in an unfolded state during adjustments, and any adjustment is done by pulling on a small area of ​​the membrane edge to adjust the position of the entire membrane. This can easily damage the sealing membrane. Furthermore, on the splicing side of the sealing membrane, unevenness, wrinkles, or even misalignment and skewing are very likely to occur, causing great inconvenience to subsequent heat sealing and welding operations and directly affecting the quality of membrane splicing and construction efficiency. Summary of the Invention

[0003] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this disclosure provides a vacuum preloading sealing membrane laying device for backfill subgrade.

[0004] To achieve the aforementioned objectives, the present invention provides a vacuum preloading sealing membrane laying device for backfill subgrade, comprising a movable frame, wherein two film-laying rollers are arranged inside the movable frame, and the sealing membrane is placed on the two film-laying rollers. The splicing direction of two adjacent sealing membranes is the width direction. Both ends of the movable frame are provided with tape-laying rollers, and a flat tape is wound around the outside of the tape-laying rollers. Anchoring holes are provided at both ends of the flat tape. A connecting arm is rotatably installed on the outer end of the tape-laying roller, and the top end of the connecting arm is rotatably connected to the movable frame for adjusting the front and rear position of the tape-laying roller relative to the movable frame in the length direction of the sealing membrane. Taking the splicing direction of the sealing membrane as a reference, when laying the sealing membrane, the downstream flat tape is supported on the bottom of the front side of the sealing membrane, and the upstream flat tape is pressed on the top of the rear side of the sealing membrane.

[0005] Optionally, the movable frame includes a frame body, movable wheels, and auxiliary rollers. The film-laying rollers are rotatably mounted on both sides of the bottom of the frame body. The movable wheels are fixedly mounted on the ends of the film-laying rollers and are located on the outside of the frame body. Multiple auxiliary rollers are rotatably mounted inside the frame body. Two film-laying rollers and multiple auxiliary rollers form an open-topped semicircle.

[0006] Optionally, rotating frames are rotatably mounted on both sides of the top of the movable frame. The rotating frames can rotate to the front or rear of the movable frame. A ratchet plate that can be raised and lowered is slidably provided on the side of the rotating frame away from the movable frame. A pressure frame that presses down on the upper inclined surface of the connecting arm is provided at the bottom end of the ratchet plate. A ratchet block is slidably provided at the bottom of the rotating frame. A spring is provided between the ratchet block and the rotating frame. The ratchet block can restrict the upward movement of the pressure frame by engaging with the ratchet plate. When the connecting arm swings downward, the pressure frame moves downward by its own weight.

[0007] Optionally, the pressure frame includes a bracket, pressure rods, and limiting plates. The bracket is in the shape of a "mountain" and pressure rods are rotatably installed between two adjacent sides of the bracket. The two pressure rods are respectively used to press down on the inclined surface on the upper side of the connecting arm located on the front or rear side of the movable frame. Limiting plates are vertically provided at the ends of the bracket. The limiting plates extend into the width direction of the connecting arm and are used to lock the rotating frame in the rotation direction of the rotating frame in coordination with the connecting arm.

[0008] Optionally, a pressure plate is provided at the top of the connecting arm. When the rotating frame and the pressure plate are located on the same side of the movable frame, the pressure frame can press down on the upper inclined surface of the pressure plate to keep the unloading roller in a suspended state.

[0009] Optionally, a bushing is rotatably mounted inside the top end of the connecting arm, and pulleys are mounted on the outside of the bushing and the outer end of the belt feeding roller. A synchronous belt is rotatably mounted between the two pulleys. A synchronous shaft is rotatably mounted between the two sides of the top end of the moving frame, and two bushings are respectively mounted on the two ends of the synchronous shaft. A handle is mounted on both ends of the synchronous shaft.

[0010] Optionally, each of the two bushings is fixedly connected to an extension sleeve at its opposite end. A movable sleeve is slidably fitted on the outside of the extension sleeve along the axial direction. A positioning block is fixedly installed on the inner surface of the movable sleeve. An adjusting screw sleeve is rotatably fitted on the opposite end of each of the two movable sleeves. A threaded tube is installed on the inner thread of the adjusting screw sleeve. The threaded tube is fixedly fitted on the outside of the synchronous shaft. A positioning groove is provided at the opposite ends of the two threaded tubes. By rotating the adjusting screw sleeve, the positioning block can be controlled to insert into or disengage from the positioning groove.

[0011] Optionally, a locking rod is fixedly installed at one of the opposite ends of the two movable sleeves, and a locking groove centered on the synchronous shaft is provided on the inner wall of both sides of the movable frame. When the positioning block is separated from the positioning groove, the locking rod is inserted into one of the locking grooves.

[0012] Optionally, the release end of the flat strip and the side of the release roller are both provided with a sleeve groove, and the other end of the flat strip is provided with a sleeve block. By inserting the sleeve block of one of the flat strips into the sleeve groove of the other flat strip, the two flat strips can be connected.

[0013] Optionally, the movable frame is provided with a movable plate that can slide in the width direction. Pressing rollers are rotatably installed on both sides of the bottom end of the movable plate. The movable plate is located on the downstream side of the movable frame in the direction of sealing film splicing, and the pressing roller located downstream can press the sealing film onto the flat strip located downstream.

[0014] The technical solution provided in this disclosure has the following advantages compared with the prior art: 1. The sealing film is laid by carrying the sealing film on a moving frame and film-laying roller. Compared with the existing technology that relies on manual rolling, this method can greatly improve the efficiency of sealing film laying. The sealing film is laid more smoothly and regularly, which greatly reduces the difficulty of subsequent readjustment and reduces the risk of film damage.

[0015] 2. By using a combination of a feeding roller and flat belts in the film-laying process, the smoothness and tension of the sealing film can be improved, resulting in better stability, enhanced wind resistance, and improved laying effect. In the overlapping area on the splicing side of the sealing film, the upper and lower flat belts can clamp the overlapping area, better maintaining its stability and smoothness. Furthermore, the lower belt can serve as the base for the heat-sealing welding machine, facilitating the welding operation and achieving a smoother heat-sealing splicing process for the sealing film.

[0016] 3. During the film laying operation, the cooperation of the rotating frame, ratchet block, ratchet plate and pressure frame locks the upward swing direction of the connecting arm after it swings downward, so that the feeding roller and the flat belt as a whole always have a stable supporting force on the moving frame. At the same time, the two connecting arms are set one in front and one behind in the front and rear directions of the moving frame to achieve balanced support on the front and rear sides of the moving frame, thus making the moving frame more stable and more convenient for film laying operation.

[0017] 4. By setting two connecting arms one in front of the other in the front-to-back direction of the moving frame, the cooperation of the rotating frame, ratchet block, ratchet plate and pressure frame can fix the connecting arms in the state of the unloading roller being suspended when the tape is rewinding. At this time, the front and rear sides of the moving frame are well balanced, which facilitates the rewinding operation of the flat tape.

[0018] 5. The bushing and synchronous shaft enable the two unloading rollers to rotate synchronously. During the rewinding of the tape, the two unloading rollers rotate synchronously, ensuring that the amount of flat tape wound is the same, so as to better ensure the balance of the moving frame and facilitate the rewinding of the flat tape. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the vacuum preloading sealing membrane laying device for backfill roadbed of the present invention during membrane laying operation; Figure 2 This is the present invention. Figure 1 Enlarged view of point A in the middle; Figure 3 This is the present invention. Figure 1 Schematic diagram of the vacuum preloading sealing membrane laying device for Zhongchong fill subgrade; Figure 4 This is the present invention. Figure 3 Enlarged view at point B in the middle; Figure 5 This is the present invention. Figure 3 A schematic diagram of the medium-speed mobile frame; Figure 6 This is the present invention. Figure 5 Enlarged view at point C; Figure 7 This is the present invention. Figure 3 A disassembled schematic diagram of the upstream connecting arm, extension sleeve, movable sleeve, and adjusting screw sleeve; Figure 8 This is the present invention. Figure 7 Another perspective view; Figure 9 This is a schematic diagram of the two flat strips being spliced ​​together according to the present invention; Figure 10 This is a schematic diagram of the structure of the rotating frame, ratchet plate, and pressure frame of the present invention; Figure 11 This is the present invention. Figure 10 Partial sectional view of the transfer frame and ratchet plate.

[0021] Among them, 1-moving frame, 101-frame body, 102-moving wheel, 103-auxiliary roller, 2-film feeding roller, 3-belt feeding roller, 4-flat belt, 5-anchoring hole, 6-connecting arm, 7-rotating frame, 8-ratchet plate, 9-pressure frame, 901-support, 902-pressure rod, 903-limiting plate, 10-ratchet block, 11-spring, 12-pressure plate, 13-shaft sleeve, 14-pulley, 15-synchronous belt, 16-synchronous shaft, 17-handle, 18-extension sleeve, 19-moving sleeve, 20-positioning block, 21-adjusting screw sleeve, 22-screw tube, 23-positioning groove, 24-locking rod, 25-locking groove, 26-sleeve groove, 27-sleeve block, 28-moving plate, 29-film pressing roller, 30-connecting rod, 31-rod sleeve, 32-limiting block, 33-limiting groove. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should fall within the scope of the technical content disclosed in the present invention. It should be noted that in this specification, relational terms such as "first" and "second" are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0024] like Figure 1 and Figure 3 As shown, this application discloses a vacuum preloading sealing membrane laying device for backfill roadbed, including a movable frame 1. The movable frame 1 is equipped with two film-laying rollers 2. The sealing membrane is placed on the two film-laying rollers 2. The splicing direction of two adjacent sealing membranes is the width direction. Both ends of the movable frame 1 are equipped with tape-laying rollers 3. The tape-laying rollers 3 are wrapped with flat tapes 4. An anchoring holes 5 are provided on the release end of the flat tapes 4. A connecting arm 6 is rotatably installed on the outer end of the tape-laying rollers 3. The top end of the connecting arm 6 is rotatably connected to the movable frame 1 and is used to adjust the front and rear position of the tape-laying rollers 3 relative to the movable frame 1 in the length direction of the sealing membrane. With the splicing direction of the sealing membrane as the reference, when laying the sealing membrane, the downstream flat tape 4 is supported on the bottom of the front side of the sealing membrane, and the upstream flat tape 4 is pressed on the top of the rear side of the sealing membrane.

[0025] During membrane laying, at the joint of two adjacent sealing membranes, the bottom of the overlapping section is supported by a flat strip 4, and another flat strip 4 presses down on top of the overlapping section. On the one hand, the flat strip 4 can better maintain a smooth and stable fit at the overlapping section, greatly alleviating the deviation and wrinkling of the sealing membrane, providing effective protection for heat sealing operations. On the other hand, the flat strip 4 can prevent the overlapping section of the sealing membrane from directly contacting the ground, making the overlapping section less susceptible to interference from sharp objects on the ground, and the surface is smoother, which is more conducive to heat sealing operations. During heat sealing operations, the flat strip 4 located at the bottom of the overlapping section can serve as the base for the hot air welding machine, avoiding the impact of loose ground on the movement of the hot air welding machine, solving the problem that loose ground is not conducive to the movement of the hot air welding machine, improving the efficiency of membrane heat sealing operations. Moreover, the sealing membrane located at the bottom of the overlapping section is supported by the flat strip 4, making it less prone to wrinkling after heating and less susceptible to interference from sharp objects on the ground, which can greatly improve the membrane heat sealing effect.

[0026] like Figure 3 As shown, the movable frame 1 includes a frame body 101, movable wheels 102, and auxiliary rollers 103. The film-laying roller 2 is rotatably installed on both sides of the bottom of the frame body 101. The movable wheels 102 are fixedly installed at the ends of the film-laying roller 2 and are located on the outside of the frame body 101. Multiple auxiliary rollers 103 are rotatably installed inside the frame body 101. The two film-laying rollers 2 and the multiple auxiliary rollers 103 form an open-topped semicircle.

[0027] During the film-laying operation, the moving wheel 102 rolls directly on the ground, maintaining the frame 101 in a stable state, thus allowing the frame 101 to stably support the sealing film. As the moving wheel 102 rolls, the two film-laying rollers 2 rotate synchronously with it. At this time, the sealing film supported by the film-laying rollers 2 can be continuously released, achieving an auxiliary film-laying effect, reducing the internal tension of the sealing film during release, and preventing damage to the sealing film. The auxiliary roller 103 can significantly reduce the gap between the film-laying rollers 2, preventing the sealing film roll on the film-laying rollers 2 from falling off after the film is laid down.

[0028] like Figure 1 , Figure 10 and Figure 11As shown, rotating frames 7 are rotatably mounted on both sides of the top of the movable frame 1. The rotating frames 7 can rotate to the front or rear of the movable frame 1. A ratchet plate 8 that can be raised and lowered is slidably arranged on the side of the rotating frame 7 away from the movable frame 1. A pressure frame 9 that presses down on the upper inclined surface of the connecting arm 6 is arranged at the bottom of the ratchet plate 8. A ratchet block 10 is slidably arranged at the bottom of the rotating frame 7. A spring 11 is arranged between the ratchet block 10 and the rotating frame 7. The ratchet block 10 can restrict the pressure frame 9 from moving upward by meshing with the ratchet plate 8. When the connecting arm 6 swings downward, the pressure frame 9 moves downward by its own weight.

[0029] By rotating the rotating frame 7 on top of the moving frame 1, the position of the rotating frame 7 can be adjusted according to the position of the connecting arm 6, so that the corresponding rotating frame 7 and connecting arm 6 can be located on the same side of the moving frame 1. During the film laying operation, as the flat strip 4 is continuously laid out, the outer diameter of the entire flat strip 4, including the feeding roller 3, will decrease. At this time, under its own weight, the connecting arm 6 will rotate downward. Under its own weight, the pressure frame 9 will drive the ratchet plate 8 to move downward. During the downward movement of the ratchet plate 8, it can squeeze the ratchet block 10 to pass over it. The ratchet block 10 can lock the ratchet plate 8 upward, so that the connecting arm 6 cannot swing upward after swinging downward, thus locking the connecting arm 6 in one direction. This allows the two feeding rollers 3 and the flat strip 4 to support and limit the moving frame 1 on both the front and rear sides. On the one hand, the flat strip 4 located downstream in the film splicing direction always maintains stable contact with the ground, improving the unfolding effect of the flat strip 4, preventing the flat strip 4 from shifting, and improving the support effect on the overlapping part of the sealing film. On the other hand, the flat strip 4 located upstream in the membrane splicing direction is always stably pressed on the top of the upstream side of the sealing membrane, so that the sealing membrane is pressed down after it is unfolded, ensuring that the sealing membrane is smoother and less prone to displacement and wrinkles after unfolding.

[0030] like Figure 10 As shown, the pressure frame 9 includes a bracket 901, a pressure rod 902, and a limiting plate 903. The bracket 901 is in the shape of a "mountain". A pressure rod 902 is rotatably installed between two adjacent sides of the bracket 901. The two pressure rods 902 are used to press down on the inclined surface on the upper side of the connecting arm 6 located on the front or rear side of the movable frame 1. A limiting plate 903 is vertically provided at the end of the bracket 901. The limiting plate 903 extends into the width direction of the connecting arm 6 and is used to lock the rotating frame 7 in the rotation direction of the rotating frame 7 in coordination with the connecting arm 6.

[0031] The bracket 901 is in an open, downward-facing position, with its top fixed to the bottom of the ratchet plate 8. The pressure bar 902 can roll on the upper inclined surface of the connecting arm 6, reducing the friction between the pressure frame 9 and the connecting arm 6. When the pressure bar 902 presses down on the connecting arm 6, the limiting plates 903 located on both sides of the pressure bar 902 are positioned on both sides of the connecting arm 6, respectively, and are sleeved outside the connecting arm 6, preventing the rotating frame 7 from rotating. The connecting arm 6 has the effect of limiting the rotation of the rotating frame 7.

[0032] like Figure 1 As shown, a pressure plate 12 is provided at the top of the connecting arm 6. When the rotating frame 7 and the pressure plate 12 are located on the same side of the moving frame 1, the pressure frame 9 can press down on the upper inclined surface of the pressure plate 12 to keep the belt unloading roller 3 in a suspended state.

[0033] By rotating the rotating frame 7, the pressure frame 9 moves above the pressure plate 12. Then, the connecting arm 6 swings upward, causing the pressure frame 9 to press down on the upper inclined surface of the pressure plate 12, fixing the unloading roller 3 in a suspended state. The two connecting arms 6 are located on the front and rear sides of the moving frame 1, respectively. When the unloading roller 3 is in a suspended state, it better maintains the balance of the moving frame 1. At this time, the unloading roller 3 can be used to wind the flat strip 4, realizing the rewinding operation of the flat strip 4.

[0034] like Figure 2 and Figure 7 As shown, a bushing 13 is rotatably installed inside the top of the connecting arm 6. Pulleys 14 are installed on the outside of the bushing 13 and the outer end of the belt feeding roller 3. A synchronous belt 15 is rotatably sleeved between the two pulleys 14. A synchronous shaft 16 is rotatably installed between the two sides of the top of the moving frame 1. Two bushings 13 are respectively sleeved on the two ends of the synchronous shaft 16. A handle 17 is installed at both ends of the synchronous shaft 16.

[0035] By operating the handle 17 to drive the synchronous shaft 16 to rotate, the synchronous shaft 16 can drive the two bushings 13 to rotate synchronously. At this time, the bushings 13 cause the unloading roller 3 to rotate through the pulley 14 and the synchronous belt 15. Thus, when rewinding the flat strip 4, the two unloading rollers 3 can rotate synchronously, so that the two flat strips 4 can be rewinded at the same time, which can greatly improve the efficiency of the flat strip 4 rewinding operation.

[0036] like Figures 5 to 8 As shown, each of the two bushings 13 has an extension sleeve 18 fixedly connected to its opposite end. A movable sleeve 19 is slidably fitted on the outside of the extension sleeve 18 along the axial direction. A positioning block 20 is fixedly installed on the inner surface of the movable sleeve 19. An adjusting screw sleeve 21 is rotatably fitted on the opposite end of each of the two movable sleeves 19. A screw tube 22 is installed on the inner thread of the adjusting screw sleeve 21. The screw tube 22 is fixedly fitted on the outside of the synchronous shaft 16. A positioning groove 23 is provided at the opposite ends of the two screw tubes 22. By rotating the adjusting screw sleeve 21, the positioning block 20 can be controlled to insert into or disengage from the positioning groove 23.

[0037] When the positioning block 20 is inserted into the positioning groove 23, the synchronous shaft 16 can drive the two moving sleeves 19 to rotate synchronously through the solenoid 22, the positioning groove 23 and the positioning block 20. The two moving sleeves 19 can make the two bushings 13 rotate synchronously through the extension sleeve 18, thereby enabling the two belt feeding rollers 3 to rotate synchronously.

[0038] By rotating the adjusting sleeve 21 toward the end of the synchronous shaft 16, the adjusting sleeve 21 moves toward the end of the synchronous shaft 16 outside the screw tube 22. The adjusting sleeve 21 adjusts the displacement of the moving sleeve 19, causing the positioning block 20 to disengage from the positioning groove 23. Thus, the synchronous shaft 16 and the bushing 13 are separated in the circumferential direction, and the two feeding rollers 3 can be released from the synchronous rotation state. At this time, when operating the handle 17, one of the feeding rollers 3 can be rotated individually through the synchronous shaft 16.

[0039] like Figure 2 As shown, locking rods 24 are fixedly installed at opposite ends of the two movable sleeves 19. A locking groove 25 centered on the synchronous shaft 16 is provided on the inner wall of both sides of the movable frame 1. When the positioning block 20 is separated from the positioning groove 23, the locking rod 24 is inserted into one of the locking grooves 25.

[0040] When the unloading roller 3 is desynchronized from the synchronous shaft 16, the locking rod 24 is inserted into the locking groove 25. At this time, the locking rod 24 and the locking groove 25 can limit the bushing 13 in the circumferential direction, thereby ensuring that the unloading roller 3, which is desynchronized from the synchronous shaft 16, remains locked.

[0041] like Figure 3 , Figure 7 and Figure 9 As shown, the release end of the flat strip 4 and the side of the feeding roller 3 are both provided with a groove 26, and the other end of the flat strip 4 is provided with a sleeve block 27. By inserting the sleeve block 27 of one flat strip 4 into the groove 26 of another flat strip 4, the two flat strips 4 can be connected. Through the cooperation of the groove 26 and the sleeve block 27, the two flat strips 4 can be spliced ​​together, so that multiple flat strips 4 can be wound on the feeding roller 3 at the same time, so as to better adapt to the film laying operation of multiple sealing films.

[0042] like Figure 4 As shown, the movable frame 1 is equipped with a movable plate 28 that can slide in the width direction. Pressure rollers 29 are rotatably mounted on both sides of the bottom end of the movable plate 28. The movable plate 28 is located downstream of the movable frame 1 in the film splicing direction, and the downstream pressure rollers 29 can press the sealing film tightly onto the downstream flat strip 4. During the film laying operation, the flat strip 4 and the film release roller 2, located upstream in the film splicing direction, press down on the top of the sealing film to pre-compress it. Meanwhile, the pressure rollers 29 roll on the top of the downstream side of the sealing film to pre-compress its downstream side, thereby improving the film laying effect and preventing film misalignment and wrinkles.

[0043] A connecting rod 30 is installed inside the movable frame 1. A rod sleeve 31 is fixedly installed on the top of the movable plate 28. The rod sleeve 31 is rotatably sleeved outside the connecting rod 30. Limiting blocks 32 are fixedly installed at both ends of the connecting rod. Limiting grooves 33 are provided at both ends of the rod sleeve 31. By moving the movable plate 28 outside the connecting rod 30, one of the sleeve grooves is fitted with one of the limiting blocks 32. At this time, the pressure roller 29 can be fixed in a state where it can press down on the top of the sealing film. By moving the movable plate 28, the limiting groove 33 is disengaged from the limiting block 32. At this time, the bottom end of the movable plate 28 can be rotated upward to release the pressure of the pressure roller 29 on the sealing film, so as to better adapt to the film laying operation.

[0044] The vacuum preloading sealing membrane laying device for the fill subgrade of this application can be used to carry out membrane laying operations in the following manner: During the film laying process, taking the splicing direction of the sealing film as a reference, the tape feeding roller 3 located upstream of the splicing direction is positioned behind the moving frame 1 in the length direction of the sealing film, and the tape feeding roller 3 located downstream of the splicing direction is positioned in front of the moving frame 1 in the length direction of the sealing film.

[0045] When laying the first sealing film: Step 1: Release the synchronous rotation relationship between the upstream feeding roller 3 and the synchronous shaft 16, pull the downstream flat belt 4 and the sealing film backward a certain distance, so that the release ends of the downstream flat belt 4 and the sealing film are both located behind the upstream feeding roller 3. Then, pull the upstream flat belt 4 out so that the release ends of both flat belts 4 are aligned with the release ends of the sealing film.

[0046] Step 2: Using the anchor rod to pass through the sealing membrane and anchoring hole 5, simultaneously anchor the sealing membrane and the release ends of the two flat strips 4 to the ground. Then operate the adjusting screw sleeve 21 to restore the upstream release roller 3 to the synchronous rotation state of the synchronous shaft 16.

[0047] Step 3: Push the moving frame 1 forward to begin the film laying operation. During this process: 1. When the moving wheel 102 rolls on the ground, it drives the film-releasing roller 2 to rotate, which helps to release the sealing film.

[0048] 2. The upstream unloading roller 3 and the flat belt 4 roll together on the top of the upstream side of the sealing film. The upstream flat belt 4 follows the sealing film as it is laid out, pre-pressing the upstream side of the sealing film onto the ground, keeping the upstream side of the sealing film smooth, taut and stable.

[0049] 3. The downstream flat strip 4 is released at the bottom of the downstream side of the sealing film and supports the bottom of the downstream side of the sealing film, so that the overlapping part of the sealing film splice is supported.

[0050] 4. After a sealing film is released, a flat strip 4 is also released. The sleeve block 27 at the front end of the released flat strip 4 is pulled out from the sleeve groove 26 at the release end of the flat strip 4 wound on the release roller 3, and the released flat strip 4 is separated from the release roller 3.

[0051] By following the above steps, the sealing film laying operation can be completed.

[0052] When laying the second sealing membrane: This causes the upstream flat strip 4 to press down on the top of the overlapping part of the sealing film, so that the second sealing film is directly pressed on the top of the downstream side of the first sealing film. Then, the film laying operation is carried out according to steps one to three above until the second sealing film is laid.

[0053] Similarly, when the third to the last sealing membrane is laid, the upstream side of the next sealing membrane is pressed down on the top of the downstream side of the previous sealing membrane.

[0054] In summary, when using the vacuum preloading sealing membrane laying device for backfill subgrade of this application for membrane laying operations, the membrane laying operation can be carried out by two workers pushing the moving frame 1, which greatly facilitates the laying of the sealing membrane and improves the work efficiency. During the membrane laying process, the flat belt 4 and the pressure roller 29 can improve the smoothness and tension of the membrane. At the overlapping part of the membrane splicing, it can be clamped by the two flat belts 4 from the top and bottom. When the heat sealing welding operation is carried out, the flat belt 4 located on the lower side can serve as the walking base of the heat sealing welding machine, improving the work efficiency and effect of membrane heat sealing welding.

[0055] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A device for laying a vacuum preloading sealing membrane for backfill roadbeds, characterized in that, The device includes a movable frame (1), which has two film-laying rollers (2) inside. The sealing film is placed on the two film-laying rollers (2). The splicing direction of two adjacent sealing films is the width direction. Both ends of the movable frame (1) are provided with tape-laying rollers (3). The tape-laying rollers (3) are wrapped with flat tapes (4). Both ends of the flat tapes (4) are provided with anchoring holes (5). A connecting arm (6) is rotatably installed on the outer end of the tape-laying rollers (3). The top end of the connecting arm (6) is rotatably connected to the movable frame (1) and is used to adjust the front and rear position of the tape-laying rollers (3) relative to the movable frame (1) in the length direction of the sealing film. Based on the splicing direction of the sealing film, when laying the sealing film, the downstream flat tape (4) is supported on the bottom of the front side of the sealing film, and the upstream flat tape (4) is pressed on the top of the rear side of the sealing film.

2. The vacuum preloading sealing membrane laying device for backfill roadbed according to claim 1, characterized in that, The mobile frame (1) includes a frame body (101), a moving wheel (102), and an auxiliary roller (103). The film-laying roller (2) is rotatably installed on both sides of the bottom of the frame body (101). The moving wheel (102) is fixedly installed at the end of the film-laying roller (2) and the moving wheel (102) is located on the outside of the frame body (101). Multiple auxiliary rollers (103) are rotatably installed inside the frame body (101). Two film-laying rollers (2) and multiple auxiliary rollers (103) form an open-ended semicircle.

3. The vacuum preloading sealing membrane laying device for backfill roadbed according to claim 1, characterized in that, The top of the mobile frame (1) is rotatably mounted on both sides of the rotating frame (7). The rotating frame (7) can rotate to the front or rear side of the mobile frame (1). The rotating frame (7) is slidably provided with a ratchet plate (8) that can be raised and lowered on the side away from the mobile frame (1). The bottom end of the ratchet plate (8) is provided with a pressure frame (9) that presses down on the upper inclined surface of the connecting arm (6). The bottom of the rotating frame (7) is slidably provided with a ratchet block (10). A spring (11) is provided between the ratchet block (10) and the rotating frame (7). The ratchet block (10) can restrict the pressure frame (9) from moving upward by meshing with the ratchet plate (8). When the connecting arm (6) swings downward, the pressure frame (9) moves downward by its own weight.

4. The vacuum preloading sealing membrane laying device for backfill roadbed according to claim 3, characterized in that, The pressure frame (9) includes a bracket (901), a pressure rod (902), and a limiting plate (903). The bracket (901) is in the shape of a "mountain". Pressure rods (902) are rotatably installed between two adjacent sides of the bracket (901). The two pressure rods (902) are used to press down on the inclined surface on the upper side of the connecting arm (6) located on the front or rear side of the movable frame (1). The end of the bracket (901) is vertically provided with a limiting plate (903). The limiting plate (903) extends into the width direction of the connecting arm (6) and is used to lock the rotating frame (7) in the rotation direction of the rotating frame (7) in coordination with the connecting arm (6).

5. The vacuum preloading sealing membrane laying device for backfill roadbed according to claim 3, characterized in that, The top of the connecting arm (6) is provided with a pressure plate (12). When the rotating frame (7) and the pressure plate (12) are located on the same side of the moving frame (1), the pressure frame (9) can press down on the upper inclined surface of the pressure plate (12) to keep the belt feeding roller (3) in a suspended state.

6. The vacuum preloading sealing membrane laying device for backfill roadbed according to claim 1, characterized in that, A bushing (13) is rotatably mounted inside the top end of the connecting arm (6). Pulleys (14) are mounted on the outside of the bushing (13) and the outer end of the belt feeding roller (3). A synchronous belt (15) is rotatably mounted between the two pulleys (14). A synchronous shaft (16) is rotatably mounted between the two sides of the top end of the moving frame (1). The two bushings (13) are respectively mounted on the two ends of the synchronous shaft (16). A handle (17) is mounted on both ends of the synchronous shaft (16).

7. The vacuum preloading sealing membrane laying device for backfill roadbed according to claim 6, characterized in that, An extension sleeve (18) is fixedly connected to the opposite ends of the two bushings (13). A movable sleeve (19) is slidably fitted on the outside of the extension sleeve (18) along the axial direction. A positioning block (20) is fixedly installed on the inner surface of the movable sleeve (19). An adjusting screw sleeve (21) is rotatably fitted on the opposite ends of the two movable sleeves (19). A screw tube (22) is threaded on the inner thread of the adjusting screw sleeve (21). The screw tube (22) is fixedly fitted on the outside of the synchronous shaft (16). A positioning groove (23) is provided on the opposite ends of the two screw tubes (22). By rotating the adjusting screw sleeve (21), the positioning block (20) can be controlled to insert into or disengage from the positioning groove (23).

8. The vacuum preloading sealing membrane laying device for backfill roadbed according to claim 7, characterized in that, Locking rods (24) are fixedly installed at opposite ends of the two movable sleeves (19). A locking groove (25) centered on the synchronous shaft (16) is provided on both inner walls of the movable frame (1). When the positioning block (20) is separated from the positioning groove (23), the locking rod (24) is inserted into one of the locking grooves (25).

9. The vacuum preloading sealing membrane laying device for backfill roadbed according to claim 1, characterized in that, The release end of the flat strip (4) and the side of the release roller (3) are both provided with a sleeve groove (26), and the other end of the flat strip (4) is provided with a sleeve block (27). By inserting the sleeve block (27) of one of the flat strips (4) into the sleeve groove (26) of the other flat strip (4), the two flat strips (4) can be connected.

10. A vacuum preloading sealing membrane laying device for backfill roadbed according to claim 1, characterized in that, The movable frame (1) is provided with a movable plate (28) that can slide in the width direction. Both sides of the bottom end of the movable plate (28) are rotatably mounted with pressure rollers (29). The movable plate (28) is located on the downstream side of the movable frame (1) in the direction of sealing film splicing, and the pressure roller (29) located downstream can press the sealing film onto the flat strip (4) located downstream.

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