Environment-friendly cast-in-place pile construction mud replacement and conveying device

Abstract

The application relates to the technical field of building construction equipment, and particularly discloses an environment-friendly cast-in-place pile construction mud replacement and conveying device, which comprises a material suction inner pipe and a material injection outer pipe, the material injection outer pipe is fixedly connected to the outer side of the material suction inner pipe, a sealing rubber strip is fixedly connected to the connection position, an auxiliary mechanism is arranged on the common side of the material suction inner pipe and the material injection outer pipe, and a blockage prevention mechanism is fixedly connected to the bottom end of the material suction inner pipe. The inner and outer nested material suction inner pipe and material injection outer pipe structure is arranged, the layered replacement mode of high-position slurry distribution of the material injection outer pipe and low-position slurry suction of the material suction inner pipe is utilized, the traditional double-pipe isoperimetric operation mode is changed, the convection and mixing of new and old mud to form turbulence is effectively avoided, the orderly replacement from top to bottom is realized, the mud replacement efficiency is greatly improved, the use amount of fresh mud is reduced, the disturbance of hole bottom sludge is avoided, the hole cleaning quality of the cast-in-place pile is ensured, and the construction defects such as mud inclusion in the pile body and pile breakage are eliminated.

Description

Technical Field

[0001] This invention relates to the field of construction equipment technology, and in particular to an environmentally friendly slurry replacement and conveying device for cast-in-place pile construction. Background Technology

[0002] Drilled piles are a widely used type of foundation pile in building construction and municipal bridge engineering. After the pile hole is completed, a large amount of sediment, coarse sand and suspended mud will remain inside the pile hole. In order to ensure the quality of subsequent concrete pouring and avoid quality problems such as pile breakage, mud inclusion and pile defects, it is necessary to replace and clean the old mud inside the pile hole. The mud replacement operation mainly involves transporting qualified fresh wall protection mud into the pile hole and extracting the waste mud containing slag and mud from the hole, thereby reducing the thickness of sediment at the bottom of the hole and meeting the requirements of the pile foundation construction specifications.

[0003] Currently, traditional slurry replacement and conveying equipment for cast-in-place piles mostly uses two independent pipes to complete the slurry injection and pumping operations separately. The heights of the inlet and outlet pipes are similar. After the fresh slurry is injected, it will directly convect and mix with the waste slurry containing sediment at the bottom of the hole, forming turbulent slurry flow. This not only results in low replacement efficiency and high consumption of fresh slurry, but also serious waste of resources. It also easily disturbs the sediment at the bottom of the hole, leading to incomplete hole cleaning and greatly affecting the quality of cast-in-place piles. At the same time, the traditional pumping pipe is a plain pipe structure that relies solely on the negative pressure of the pump body for suction without an internal auxiliary conveying structure. When pumping slurry containing coarse sand and heavy slag, the sand and gravel are easy to deposit and accumulate on the pipe wall, causing intermittent pumping and the pump body to run dry. Summary of the Invention

[0004] The purpose of this invention is to provide an environmentally friendly slurry replacement and conveying device for cast-in-place pile construction, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides an environmentally friendly mud replacement and conveying device for cast-in-place pile construction, comprising an inner suction pipe and an outer injection pipe. The outer injection pipe is fixedly connected to the outside of the inner suction pipe, and a sealing strip is fixedly connected at the connection. The length of the inner suction pipe is greater than the length of the outer injection pipe. An auxiliary mechanism is provided on a common side of the inner suction pipe and the outer injection pipe. An anti-blocking mechanism is fixedly connected to the bottom end of the inner suction pipe. A fixing frame is provided on one side of the inner suction pipe and the outer injection pipe. A lifting mechanism is provided on one side of the fixing frame. One side of the lifting mechanism is fixedly connected to one side of the outer injection pipe. A discharge port is opened at the bottom end of the outer injection pipe, and multiple discharge ports are provided at equal intervals.

[0006] Furthermore, a discharge pipe is fixedly connected to one side of the top end of the inner suction tube, and a one-way valve is fixedly connected to one side of the discharge pipe.

[0007] Furthermore, a feed pipe is provided on one side of the top end of the injection outer pipe, one side of the auxiliary mechanism is connected to one side of the feed pipe, a support frame is fixedly connected to one side of the feed pipe, one side of the support frame is fixedly connected to one side of the injection outer pipe, and both the discharge pipe and the feed pipe are connected to the pump body through flanges.

[0008] Furthermore, the auxiliary mechanism includes a first motor, which is fixedly connected to the top end of the suction inner tube. A first driving gear is fixedly connected to the output end of the first motor. A first driven gear is meshed with one side of the first driving gear. An assembly rod is fixedly connected to the middle of the first driven gear. The assembly rod is rotatably connected to the suction inner tube through a bearing, and a first spiral blade is fixedly connected to one side of the assembly rod that extends into the suction inner tube.

[0009] Furthermore, a second driving gear is fixedly connected to the side of the output end of the first motor away from the first driving gear, a second driven gear is meshed with one side of the second driving gear, a guide tube is fixedly connected to the middle of the second driven gear, the bottom end of the guide tube is rotatably connected to the top end of the injection outer tube, and the top end of the guide tube is rotatably connected to the bottom end of the feed tube, and a second spiral blade is fixedly connected inside the guide tube.

[0010] Furthermore, the anti-clogging mechanism includes an elevation chamber, which is fixedly connected to the bottom end of the inner suction tube. A hemispherical anti-clogging filter is fixedly connected to the middle of the elevation chamber by bolts. The hemispherical anti-clogging filter is located directly below the first spiral blade, and a scraping brush is attached to and abuts against the inner side of the hemispherical anti-clogging filter.

[0011] Furthermore, a second motor is provided on one side of the raised chamber, and a transmission gear is fixedly connected to the output end of the second motor. A linkage gear is meshed with one side of the transmission gear. Both the linkage gear and the transmission gear are rotatably connected inside the raised chamber. The scraper brush is fixedly connected to the bottom end of the linkage gear by bolts.

[0012] Furthermore, the bottom end of the fixing frame is connected to a positioning rod, and multiple positioning rods are provided.

[0013] Furthermore, the lifting mechanism includes a lead screw, which is rotatably connected to the inside of one side of the fixed frame. A lifting block is threaded onto the outer surface of the lead screw. One side of the lifting block is fixedly connected to one side of the injection outer tube. A third motor is fixedly connected to one side of the top of the fixed frame. A worm gear is fixedly connected to the output end of the third motor. A worm wheel is meshed with one side of the worm gear. The worm wheel is fixedly connected to the side of the lead screw that extends out of the fixed frame.

[0014] Furthermore, guide grooves are provided on both sides of the interior of the fixed frame, and guide blocks are slidably connected inside the guide grooves. The guide blocks are fixedly connected to both sides of the lifting block.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] Firstly, this invention, by setting up an inner suction pipe and an outer injection pipe structure with inner and outer nesting, utilizes a layered replacement method of high-level slurry distribution in the outer injection pipe and low-level slag suction in the inner suction pipe, which changes the traditional dual-pipe equal-height operation mode. This effectively avoids the problem of turbulence caused by the convection and mixing of new and old mud, achieves orderly replacement from top to bottom, greatly improves mud replacement efficiency, reduces the amount of fresh mud used, and at the same time avoids disturbing the sediment at the bottom of the hole, ensuring the quality of hole cleaning of cast-in-place piles and eliminating construction defects such as mud inclusions and broken piles.

[0017] Secondly, in this invention, by setting a first spiral blade and a second spiral blade inside the inner suction pipe and the outer injection pipe respectively, and by using a first motor in conjunction with a gear set for transmission, an auxiliary pushing and guiding effect is formed on the mud inside the pipe. This changes the traditional conveying method that relies solely on the negative pressure of the pump body for suction, effectively avoiding the deposition and accumulation of coarse sand and heavy slag on the inner wall of the pipe, solving the problems of intermittent material extraction and pump body idling, and greatly improving the stability and continuity of mud conveying. A hemispherical anti-clogging filter screen with an active scraping structure is set at the bottom of the inner suction pipe, which can effectively filter mud clumps and gravel in the suction mud. At the same time, the rotating scraping brush cleans the impurities attached to the filter screen in real time, avoiding filter screen clogging and eliminating the need for frequent shutdowns for manual cleaning. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the bottom structure of the inner suction tube and the outer injection tube in this invention;

[0020] Figure 3 In this invention Figure 2 A magnified structural diagram at point A;

[0021] Figure 4 This is a schematic diagram of the top structure of the inner suction tube and the outer injection tube in this invention;

[0022] Figure 5 In this invention Figure 4 A magnified structural diagram at point B;

[0023] Figure 6 This is a schematic diagram of the connection structure between the feed tube and the second spiral blade in this invention;

[0024] Figure 7 This is a partial structural diagram of the anti-blocking mechanism in this invention;

[0025] Figure 8 This is a schematic diagram of the connection structure between the transmission gear and the linkage gear in this invention;

[0026] Figure 9 This is a schematic diagram of the lifting mechanism structure of the present invention;

[0027] Figure 10 For the present invention Figure 9 A magnified structural diagram at point C.

[0028] In the diagram: 1. Inner suction pipe; 101. Discharge pipe; 102. Check valve; 2. Outer injection pipe; 201. Feed pipe; 202. Support frame; 203. Discharge port; 3. Auxiliary mechanism; 301. First motor; 302. First driving gear; 303. First driven gear; 304. Assembly rod; 3041. First spiral blade; 305. Second driving gear; 306. Second driven gear; 307. Guide pipe; 3071. 4. Anti-clogging mechanism; 401. Elevated chamber; 402. Hemispherical anti-clogging filter screen; 403. Scraper brush; 404. Second motor; 405. Transmission gear; 406. Linkage gear; 5. Fixing frame; 6. Insertion positioning rod; 7. Lifting mechanism; 701. Lead screw; 702. Lifting block; 703. Third motor; 704. Worm gear; 705. Worm wheel; 706. Guide groove; 707. Guide block; 8. Sealing strip. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below 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 embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1-10In this embodiment of the invention, an environmentally friendly mud replacement and conveying device for cast-in-place pile construction includes an inner suction pipe 1 and an outer injection pipe 2. The outer injection pipe 2 is fixedly connected to the outside of the inner suction pipe 1, and a sealing strip 8 is fixedly connected at the connection. The length of the inner suction pipe 1 is greater than the length of the outer injection pipe 2. An auxiliary mechanism 3 is provided on the common side of the inner suction pipe 1 and the outer injection pipe 2. An anti-blocking mechanism 4 is fixedly connected to the bottom end of the inner suction pipe 1. A fixing frame 5 is provided on one side of the inner suction pipe 1 and the outer injection pipe 2. A lifting mechanism 7 is provided on one side of the fixing frame 5. The lifting mechanism 7 is connected to... One side of the grouting outer pipe 2 is fixedly connected, and the bottom end of the grouting outer pipe 2 is provided with a discharge port 203, and multiple discharge ports 203 are evenly spaced. The gap between the inner and outer pipes is sealed by the sealing strip 8 to prevent grout leakage and pressure loss during grouting. The difference in length between the inner and outer pipes forms a high-low arrangement structure, so that the grouting outer pipe 2 is located at the top of the pile hole to complete the grouting, and the suction inner pipe 1 is lowered to the bottom of the pile hole to complete the suction and discharge of slag and grout. With the multiple discharge ports 203 evenly distributed at the bottom end of the outer pipe, fresh slurry can be discharged evenly and smoothly, effectively avoiding the problems of mixing of new and old slurry and severe turbulence in traditional equipment.

[0031] Please see Figures 4-6 A discharge pipe 101 is fixedly connected to one side of the top end of the inner suction pipe 1, and a one-way valve 102 is fixedly connected to one side of the discharge pipe 101. An inlet pipe 201 is provided on one side of the top end of the outer injection pipe 2. One side of the auxiliary mechanism 3 is connected to one side of the inlet pipe 201, and a support frame 202 is fixedly connected to one side of the inlet pipe 201. One side of the support frame 202 is fixedly connected to one side of the outer injection pipe 2. The discharge pipe 101 and the inlet pipe 201... All pumps are connected to the pump body via flanges. During operation, the feed pipe 201 and discharge pipe 101 are connected to the grouting pump and the pumping pump respectively via flanges, so that the feed and discharge pipes can operate independently without interference. The one-way valve 102 installed on the discharge pipe 101 can ensure that the mud can only be discharged outward. When the equipment stops or the pump stops working, it can effectively block the backflow of mud and sediment at the bottom of the hole, prevent impurities from flowing back into the suction pipe 1 and causing pipeline blockage, and continuously ensure the smooth flow of the pipeline.

[0032] Please see Figures 4-7The auxiliary mechanism 3 includes a first motor 301, which is fixedly connected to the top end of the suction inner tube 1. A first driving gear 302 is fixedly connected to the output end of the first motor 301. A first driven gear 303 is meshed with one side of the first driving gear 302. An assembly rod 304 is fixedly connected to the middle of the first driven gear 303. The assembly rod 304 is rotatably connected to the suction inner tube 1 via a bearing. A first spiral blade 3041 is fixedly connected to the side of the assembly rod 304 extending into the suction inner tube 1. A second driving gear 305 is fixedly connected to the side of the output end of the first motor 301 away from the first driving gear 302. A second driven gear 306 is meshed with one side of the second driving gear 305. A guide tube 307 is fixedly connected to the middle of the second driven gear 306. The bottom end of the guide tube 307 is rotatably connected to the top end of the injection outer tube 2. The top end of the 7 is rotatably connected to the bottom end of the feed pipe 201. The second spiral blade 3071 is fixedly connected inside the feed pipe 307. During construction, the first motor 301 synchronously drives the active gears at both ends to rotate. Through gear meshing, the corresponding driven gears are driven to rotate, thereby causing the assembly rod 304 and the feed pipe 307 to rotate synchronously, which in turn drives the first spiral blade 3041 and the second spiral blade 3071 to work. The first spiral blade 3041 rotates and pushes the slag-containing slurry inside the suction pipe 1, assisting the pump body to complete the suction and conveying under negative pressure, avoiding the deposition and accumulation of sand and slag on the pipe wall, and solving the problems of pump body idling and intermittent material pumping. The second spiral blade 3071 guides and pushes fresh slurry inside the feed pipe 201, making the slurry conveying more uniform and stable, avoiding slurry retention and accumulation, and effectively improving the overall efficiency of slurry replacement. The first motor 301 can simplify the equipment power structure and reduce equipment energy consumption.

[0033] Please see Figure 7The anti-clogging mechanism 4 includes a raised chamber 401, which is fixedly connected to the bottom end of the suction inner tube 1. A hemispherical anti-clogging filter 402 is bolted to the middle of the raised chamber 401. The hemispherical anti-clogging filter 402 is located directly below the first spiral blade 3041. A scraper brush 403 is attached to the inner side of the hemispherical anti-clogging filter 402. An axial safety gap is reserved between the bottom edge of the first spiral blade 3041 and the highest point of the inner side of the hemispherical anti-clogging filter 402. The entire rotational envelope of the scraper brush 403 is located within this axial safety gap, ensuring that the filter can be self-cleaned. The scraper brush 403 will not physically interfere with the rotating first spiral blade 3041; the raised chamber 401 is widened outwards to expand the bottom suction range, increase the mud suction throughput, and improve the slag removal efficiency. Compared with the flat filter screen, the hemispherical anti-clogging filter screen 402 has a larger filtration area, which can intercept large pieces of gravel, mud clumps and other impurities carried in the mud, and prevent large particles of impurities from entering the pipeline and causing blockage. At the same time, the bolt-fixed installation method makes it easy to disassemble, replace and maintain the filter screen. With the scraper brush 403 set close to the inner side of the filter screen, the mud skin and fine slag attached to the surface of the filter screen can be cleaned in real time, ensuring the filter screen is transparent and solving the problem of suction port blockage from the source.

[0034] Please see Figure 8 A sealed mounting cavity is provided on one side of the raised chamber 401. A second motor 404 is installed inside the sealed mounting cavity. The output end of the second motor 404 passes through the sealed mounting cavity through a mechanical seal (such as a combination of a water seal and a skeleton oil seal) and is fixedly connected to a transmission gear 405. A wire guide steel pipe (not shown in the figure) is fixedly installed on the outer wall of the suction inner pipe 1. The power supply cable of the second motor 404 passes through the wire guide steel pipe and is led to the ground equipment. A linkage gear 406 is meshed with one side of the transmission gear 405. Both the linkage gear 406 and the transmission gear 405 are rotatably connected to the raised chamber. Inside the high-density storage unit 401, the scraper brush 403 is fixedly connected to the bottom end of the linkage gear 406 by bolts. During operation, the second motor 404 drives the transmission gear 405 to rotate, which in turn drives the linkage gear 406 to rotate at a constant speed. This, in turn, drives the scraper brush 403 to perform a circumferential cleaning motion along the inner side of the hemispherical filter screen, thereby achieving fully automatic cleaning of the filter screen. The entire cleaning process does not require manual intervention and can complete the self-cleaning work while the equipment is operating continuously. There is no need to stop the machine to disassemble the equipment to clean the blockages and impurities, which greatly reduces the downtime of the equipment and reduces the intensity of manual labor. It is effectively adapted to long-term and continuous pile foundation hole cleaning construction scenarios.

[0035] Please see Figure 1 The bottom end of the fixing frame 5 is connected to a positioning rod 6, and there are multiple positioning rods 6; multiple positioning rods 6 are inserted and fixed on the construction ground, which can limit and fix the whole equipment at multiple points.

[0036] Please see Figure 9 The lifting mechanism 7 includes a lead screw 701, which is rotatably connected to the inside of one side of the fixed frame 5. A lifting block 702 is threadedly connected to the outer surface of the lead screw 701. One side of the lifting block 702 is fixedly connected to one side of the injection outer tube 2. A third motor 703 is fixedly connected to one side of the top of the fixed frame 5. A worm gear 704 is fixedly connected to the output end of the third motor 703. A worm wheel 705 is meshed with one side of the worm gear 704. The worm wheel 705 is fixedly connected to one end of the lead screw 701 extending out of the fixed frame 5. On the side; during construction, the third motor 703 drives the worm gear 704 to rotate, and the transmission characteristics of the worm wheel 705 and worm gear 704 drive the lead screw 701 to rotate, thereby driving the lifting block 702 to move vertically along the lead screw 701, driving the entire casing structure to rise and fall synchronously. The worm wheel 705 and worm gear 704 transmission has a self-locking function, which can lock the position of the lead screw 701 after adjustment to prevent the casing from sliding down due to its own weight, ensuring stable working height. The equipment can be flexibly adjusted according to different pile hole depths, adapting to various construction conditions and greatly improving the adaptability of the equipment.

[0037] Please see Figure 10 The fixed frame 5 has guide grooves 706 on both sides inside, and guide blocks 707 are slidably connected inside the guide grooves 706. The guide blocks 707 are fixedly connected to both sides of the lifting block 702. During the vertical movement of the lifting block 702, the guide blocks 707 on both sides always slide vertically along the guide grooves 706, which can effectively constrain the movement trajectory of the lifting block 702, prevent the lifting block 702 from deviating as the lead screw 701 rotates, avoid the sleeve from tilting and shaking, ensure the lifting process is stable and smooth, prevent the sleeve from hitting the pile hole wall, protect the pile hole forming quality, and improve the stability of equipment operation.

[0038] The working principle of this invention is as follows: After the pile hole is completed, the entire device is first moved to the pile hole construction position, so that the sleeve structure of the inner suction pipe 1 and the outer injection pipe 2 is aligned with the center of the pile hole. Then, multiple sets of plug-in positioning rods 6 are inserted and driven into the construction ground to complete the multi-point limiting and fixing of the device. After the equipment is fixed, the feed pipe 201 at the top of the outer injection pipe 2 is connected to the grouting pump and the discharge pipe 101 at the top of the inner suction pipe 1 is connected to the pumping pump through the flange. At the same time, the discharge pipe is carefully inspected. Check the status of the one-way valve 102 on 101 to ensure smooth opening and closing. Finally, check the sealing strip 8 at the connection between the inner suction pipe 1 and the outer injection pipe 2 to completely seal the gap between the inner and outer pipes, effectively preventing grout leakage and pressure drop during grouting operations. After the equipment is installed, based on the actual construction depth of the pile hole, start the third motor 703 at the top of the fixed frame 5 to drive the worm gear 704 to rotate synchronously. Through the meshing transmission between the worm gear 704 and the worm wheel 705, the screw 701 is driven to rotate... The fixed frame 5 rotates at a uniform speed inside, and the lead screw 701 drives the lifting block 702 connected to the outer thread to move vertically. The guide blocks 707 on both sides of the lifting block 702 always fit against the guide groove 706 inside the fixed frame 5 for vertical sliding limit, strictly constraining the movement of the lifting block 702 and completely avoiding the lifting block 702 from shifting or the sleeve from tilting and shaking. The lifting block 702 simultaneously drives the injection outer pipe 2 and the entire sleeve structure to be lowered smoothly, so that the injection outer pipe 2 is placed in the upper area of ​​the pile hole and the bottom of the suction inner pipe 1. The anti-blocking mechanism 4 sinks to the bottom of the pile hole to the sediment position, forming a layered operation layout of high-level grouting and low-level slag suction. After the alignment is completed, the third motor 703 is turned off, and the self-locking performance of the worm gear 705 and worm 704 is used to lock the working position of the screw 701 to prevent the casing from sliding down due to its own weight and to ensure the stability of the working height. This lifting and positioning method can not only adapt to the construction of pile holes of different depths, but also has strong equipment versatility. It changes the traditional double-pipe equal height operation mode and eliminates the problem of turbulence caused by the convection and mixing of new and old mud from the root.

[0039] After the sleeve is installed, the first motor 301 of the auxiliary mechanism 3 and the second motor 404 of the anti-clogging mechanism 4 are started. When the first motor 301 is working, the first driving gear 302 and the second driving gear 305 at both ends operate synchronously, respectively meshing and driving the first driven gear 303 and the second driven gear 306 to rotate. This synchronously drives the first spiral blade 3041 at the bottom of the assembly rod 304 to rotate at a constant speed inside the suction inner tube 1, and the second spiral blade 3071 inside the guide tube 307 to rotate synchronously. At the same time, the second motor 404 drives the transmission gear 405 inside the raised chamber 401 to rotate, meshing and driving the linkage gear 406 to rotate at a constant speed. The linkage gear 406 drives the scraper brush 403 at the bottom to complete a full circumference coverage along the inner side of the hemispherical anti-clogging filter screen 402. After cleaning and confirming that there are no blind spots and the mechanism is operating normally, the machine is put into standby mode. This pre-commissioning process relies on a single first motor 301 to synchronously drive the double helical blades, simplifying the equipment's power structure and achieving the purpose of pushing and guiding the slurry inside the pipe. This completely solves the defects of traditional bare pipes that rely solely on negative pressure suction from the pump body, resulting in sand and gravel deposition and pump idling. At the same time, the anti-clogging mechanism 4 can be activated in advance to achieve fully automatic self-cleaning of the filter screen, eliminating the need for manual shutdown for cleaning and significantly improving the continuity of subsequent construction. After the equipment is commissioned, the grouting pump and the pumping pump are started simultaneously to carry out the formal slurry replacement operation. The grouting pump delivers qualified fresh wall protection slurry into the injection outer pipe 2 through the feed pipe 201. The fresh slurry is evenly guided and pushed by the second helical blades 3071 inside the guide pipe 307, and flows from the bottom of the injection outer pipe 2. Multiple discharge ports 203 are set up and flow out smoothly, evenly distributing slurry at the top of the pile hole and gradually replacing the waste slurry from top to bottom. At the same time, the slurry pump forms a negative pressure suction through the discharge pipe 101. The waste slurry containing sediment, coarse sand, and mud clumps at the bottom of the pile hole is first gathered and collected in the widened area of ​​the raised chamber 401, and then intercepted and filtered by the hemispherical anti-clogging filter screen 402 to remove large pieces of gravel and mud clumps. The filtered slurry containing fine slag enters the inner suction pipe 1, and is continuously pushed upward by the negative pressure assisted by the first spiral blade 3041. Finally, it is stably discharged outside the pile hole through the discharge pipe 101 and the one-way valve 102. Throughout the operation, the second motor 404 continuously drives the scraper brush 403 to rotate, cleaning the fine slag and mud skin attached to the surface of the hemispherical anti-clogging filter screen 402 in real time, and always keeping the filter... The mesh is clear and unobstructed, continuously achieving orderly replacement of old and new mud in layers until the thickness of sediment at the bottom of the hole and the mud index fully meet the requirements of the pile foundation construction specifications. This eliminates mud turbulence and mixing, avoids disturbing the original sediment at the bottom of the hole, ensures thorough hole cleaning, and effectively prevents construction quality problems such as broken piles, mud inclusions, and pile defects. After the mud replacement operation meets the standards, the grouting pump and the pumping pump are shut down simultaneously to stop the mud transportation and suction operations. Then, the first motor 301 and the second motor 404 are shut down in sequence to stop the spiral blade pushing and the filter screen self-cleaning work. Subsequently, the third motor 703 is started to drive the lead screw 701 to rotate in the reverse direction, driving the lifting block 702 and the overall sleeve structure to rise smoothly, so that the inner suction pipe 1 and the outer injection pipe 2 are completely separated from the pile hole. After the reset is completed, the third motor 703 can be shut down.

Claims

1. An environmentally friendly slurry replacement and conveying device for cast-in-place pile construction, characterized in that, It includes a suction inner tube (1) and an injection outer tube (2). The injection outer tube (2) is fixedly connected to the outside of the suction inner tube (1), and a sealing strip (8) is fixedly connected at the connection. An auxiliary mechanism (3) is provided on the common side of the suction inner tube (1) and the injection outer tube (2). An anti-blocking mechanism (4) is fixedly connected to the bottom end of the suction inner tube (1). A fixing frame (5) is provided on one side of the suction inner tube (1) and the injection outer tube (2). A lifting mechanism (7) is provided on one side of the fixing frame (5). One side of the lifting mechanism (7) is fixedly connected to one side of the injection outer tube (2). A discharge port (203) is opened at the bottom end of the injection outer tube (2), and multiple discharge ports (203) are provided at equal intervals.

2. The environmentally friendly slurry replacement and conveying device for cast-in-place pile construction according to claim 1, characterized in that, A discharge pipe (101) is fixedly connected to one side of the top end of the inner suction pipe (1), and a one-way valve (102) is fixedly connected to one side of the discharge pipe (101).

3. The environmentally friendly slurry replacement and conveying device for cast-in-place pile construction according to claim 1, characterized in that, The top of the injection tube (2) is provided with a feed pipe (201), one side of the auxiliary mechanism (3) is connected to one side of the feed pipe (201), and a support frame (202) is fixedly connected to one side of the feed pipe (201). One side of the support frame (202) is fixedly connected to one side of the injection tube (2).

4. The environmentally friendly slurry replacement and conveying device for cast-in-place pile construction according to claim 3, characterized in that, The auxiliary mechanism (3) includes a first motor (301), which is fixedly connected to the top end of the suction tube (1). The output end of the first motor (301) is fixedly connected to a first driving gear (302). A first driven gear (303) is meshed with one side of the first driving gear (302). An assembly rod (304) is fixedly connected to the middle of the first driven gear (303). The assembly rod (304) is rotatably connected to the suction tube (1) through a bearing. A first spiral blade (3041) is fixedly connected to one side of the assembly rod (304) that extends into the suction tube (1).

5. The environmentally friendly slurry replacement and conveying device for cast-in-place pile construction according to claim 4, characterized in that, A second driving gear (305) is fixedly connected to the side of the output end of the first motor (301) away from the first driving gear (302). A second driven gear (306) is meshed with one side of the second driving gear (305). A guide tube (307) is fixedly connected to the middle of the second driven gear (306). The bottom end of the guide tube (307) is rotatably connected to the top end of the injection outer tube (2), and the top end of the guide tube (307) is rotatably connected to the bottom end of the feed tube (201). A second spiral blade (3071) is fixedly connected inside the guide tube (307).

6. The environmentally friendly slurry replacement and conveying device for cast-in-place pile construction according to claim 1, characterized in that, The anti-clogging mechanism (4) includes a raised chamber (401), which is fixedly connected to the bottom end of the suction inner tube (1). A hemispherical anti-clogging filter (402) is fixedly connected to the middle part of the raised chamber (401) by bolts. The hemispherical anti-clogging filter (402) is located directly below the first spiral blade (3041). A scraper brush (403) is attached to and abuts against the inner side of the hemispherical anti-clogging filter (402).

7. The environmentally friendly slurry replacement and conveying device for cast-in-place pile construction according to claim 6, characterized in that, A second motor (404) is provided on one side of the raised chamber (401). A transmission gear (405) is fixedly connected to the output end of the second motor (404). A linkage gear (406) is meshed on one side of the transmission gear (405). Both the linkage gear (406) and the transmission gear (405) are rotatably connected inside the raised chamber (401). The scraper brush (403) is fixedly connected to the bottom end of the linkage gear (406) by bolts.

8. The environmentally friendly slurry replacement and conveying device for cast-in-place pile construction according to claim 1, characterized in that, The bottom end of the fixing frame (5) is connected to a plug-in positioning rod (6), and there are multiple plug-in positioning rods (6).

9. The environmentally friendly slurry replacement and conveying device for cast-in-place pile construction according to claim 1, characterized in that, The lifting mechanism (7) includes a lead screw (701), which is rotatably connected to the inside of one side of the fixed frame (5). A lifting block (702) is threadedly connected to the outer surface of the lead screw (701). One side of the lifting block (702) is fixedly connected to one side of the injection tube (2). A third motor (703) is fixedly connected to one side of the top of the fixed frame (5). A worm gear (704) is fixedly connected to the output end of the third motor (703). A worm wheel (705) is meshed with one side of the worm gear (704). The worm wheel (705) is fixedly connected to the side of the lead screw (701) that extends out of the fixed frame (5).

10. The environmentally friendly slurry replacement and conveying device for cast-in-place pile construction according to claim 9, characterized in that, The fixed frame (5) has guide grooves (706) on both sides inside. Guide blocks (707) are slidably connected inside the guide grooves (706). The guide blocks (707) are fixedly connected to both sides of the lifting block (702).

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