Foundation pit backfilling process and foundation pit bottom cleaning device

Abstract

The application relates to the technical field of foundation pit backfilling, in particular to a foundation pit backfilling process and a foundation pit bottom cleaning device, which comprises a foundation pit bottom cleaning device, the foundation pit bottom cleaning device comprises a bearing bottom frame, loading support rods are correspondingly arranged on the front upper side of the bearing bottom frame, a bearing frame is arranged at the upper end of the loading support rod, and a conveying assembly is mounted on the front side of the bearing frame; the foundation pit bottom cleaning device can realize height regulation and control of the conveying assembly, so that the conveying assembly can better clean the garbage generated during the foundation pit bottom cleaning; the bearing frame in the foundation pit bottom cleaning device is obliquely arranged, the stress stability of the conveying assembly during garbage bearing and transportation is higher, the positioning and guiding effect of the winding wheel during the winding of the steel cable is good under the action of the guide wheel, the lifting control effect of the conveying assembly is better, the stress stability is higher, the overall use effect during the foundation pit bottom cleaning is good, and the efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of foundation pit backfilling technology, specifically to a foundation pit backfilling process and a foundation pit bottom cleaning device. Background Technology

[0002] Backfilling is the process of filling soil in construction projects. It mainly includes foundation filling, backfilling of foundation pits (trenches) or pipe trenches, backfilling of indoor floors, and backfilling and leveling of outdoor sites.

[0003] During the process of cleaning the bottom of the foundation pit, a lot of garbage is removed. In most cases, a hoist is used to transport the garbage during the cleaning process. However, garbage is prone to scattering during the transportation process, which affects the efficiency and quality of the foundation pit cleaning. When backfilling the pit, the backfill soil is compacted. However, the backfilling efficiency is low when backfilling deep foundation pits with narrow backfilling areas. Therefore, a foundation pit backfilling process and foundation pit cleaning device are needed to improve the above problems. Summary of the Invention

[0004] To address the issue of waste scattering during transport, which affects the efficiency and quality of pit cleaning, the existing method involves compacting backfill soil during backfilling. However, this method is less efficient in deep pits with narrow backfilling areas. The purpose of this invention is to provide a pit backfilling process and pit cleaning device to solve the aforementioned problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A foundation pit cleaning device includes a foundation pit cleaning equipment. The foundation pit cleaning equipment includes a support frame. Loading support rods are arranged on the left and right sides of the upper front side of the support frame. A support frame is arranged at the upper end of the loading support rods. A reinforcing frame plate is arranged on the upper rear side of the support frame. An installation frame is arranged on the upper side of the reinforcing frame plate. A winch motor is arranged on the upper side of the installation frame. A winding wheel is arranged at the drive end of the winch motor. A transfer frame is arranged at the middle of the upper side of the support frame. A guide wheel is installed on the transfer frame. A conveying component is installed on the front side of the support frame. The conveying assembly includes a bottom cleaning hopper, a positioning frame on the upper back side of the bottom cleaning hopper, a transition seat installed in the middle of the positioning frame, a first load-bearing shaft on the positioning frame with the transition seat as the center, a first limiting wheel installed on the outer end of the first load-bearing shaft, a loading frame on the lower side of the bottom cleaning hopper, a second load-bearing shaft on the lower back side of the loading frame, a second limiting wheel installed on the outer end of the second load-bearing shaft, a guide plate on the lower side of the loading frame, a third load-bearing shaft on the lower side of the guide plate, a third limiting wheel installed on the outer end of the third load-bearing shaft, a fourth load-bearing shaft on the side of the loading frame near the corner of the second load-bearing shaft, a fourth limiting wheel installed on the outer end of the fourth load-bearing shaft, and a discharge mechanism inside the loading frame. The unloading mechanism includes a sealed transfer box, with reinforcing seats provided on both sides of the sealed transfer box. An unloading shaft is installed inside the sealed transfer box via the reinforcing seats, and an unloading roller is installed inside the sealed transfer box via the unloading shaft. An unloading motor is installed on one set of the reinforcing seats.

[0006] As a preferred embodiment of the present invention, the support frame is inclined, and the included angle between the support frame and the horizontal plane of the mounting base is 60°.

[0007] As a preferred embodiment of the present invention, the lower side of the reinforcing frame is provided with reinforcing support plates on the left and right sides respectively, and the lower end of the reinforcing support plate is connected to the mounting base.

[0008] As a preferred embodiment of the present invention, the first limiting wheel and the second limiting wheel are arranged on the same horizontal plane, and the first limiting wheel and the second limiting wheel are correspondingly connected to the inner cavity groove of the support frame.

[0009] As a preferred embodiment of the present invention, the fourth limiting wheel is provided correspondingly to the frame of the support frame, and the support frame and the reinforcing frame plate are provided with limiting slots corresponding to the third limiting wheel.

[0010] In a preferred embodiment of the present invention, the winding reel, the guide reel, and the adapter are arranged on the same horizontal plane, and the winding reel, the guide reel, and the adapter are connected by ropes.

[0011] As a preferred embodiment of the present invention, the sealed transfer box and the bottom cleaning hopper are respectively arranged with their lower discharge ports corresponding to each other, and the drive end of the unloading motor is connected to the unloading shaft via a coupling.

[0012] As a preferred embodiment of the present invention, the unloading roller is adapted to the inner cavity of the sealed transfer box, and the side cross-section of the unloading roller is arranged in a star shape.

[0013] As a preferred embodiment of the present invention, the interior of the loading frame is provided with a cavity that matches the sealed transfer box, and the two ends of the sealed transfer box are connected to the loading frame through reinforcing seats.

[0014] A foundation pit backfilling process, used to implement the aforementioned foundation pit bottom cleaning device, includes the following steps: S1, Backfill Area Cleaning: By hoisting and placing the pit cleaning equipment inside the pit on its side, workers clean up the debris, basement exterior wall insulation board fragments, turf, tree roots, and other debris from the bottom of the pit and the support plate. They also remove silt and loose soil from the pit. The specific steps are as follows: When using the pit cleaning equipment, firstly, the adapter, guide wheel, and winding wheel are connected via steel cables. The hoisting motor controls the steel cables to move the cleaning bucket. The cleaning bucket is adjusted up and down on the support frame. When the cleaning bucket moves to the lower side, the workers clean the accumulated garbage into the cleaning bucket. Then, the cleaning bucket is lifted by the winch motor to exceed the depth of the pit. After the cleaning bucket is lifted to the top, the unloading motor rotates the unloading shaft. Then, under the action of the unloading roller, the garbage inside the cleaning bucket is unloaded and cleaned intermittently. Through the repeated driving of the cleaning bucket, the garbage generated from cleaning the bottom of the pit is cleaned and transported. Furthermore, when clearing the bottom of the foundation pit, protective netting should be set up around the pit to prevent garbage and debris from falling back into the backfill area. Debris blown in by strong winds should be cleaned up in time. S2, Soil quality inspection: Sand, silt, fine stone, gravel, and sand-stone mixture with uniform, loose, and highly permeable particles should be selected as backfill material. Silt, silty soil, and soil with an organic matter content greater than 6% should not be used for backfilling. Clay soil and silt should not be used for backfilling. Inspect the backfill material delivered to the site, clean out any debris and stones, and crush any gravel or blasted rock fragments larger than 50mm in diameter. Remove any fragments that are difficult to crush. If the compaction coefficient is ≥0.94, test the moisture content and dry density, which directly affect the compaction quality. The moisture content should be controlled between 8-12%, and the dry density should not be less than 1.6g / cm3. If the moisture content is greater than 12%, loosen, air dry, and air dry the material. S3, Soil unloading and backfilling: After the underground structure, exterior wall waterproofing and insulation construction are completed, soil is unloaded and backfilled in layers. Before backfilling, the corresponding height control line is marked in advance. After each layer is backfilled, the height control line is remarked. The thickness of each backfill layer should be controlled between 1m and 1.5m. When unloading soil, the rear of the dump truck is aligned with the reserved hole of the replacement support plate. Part of the soil is filled into the bottom of the foundation pit (trench) or the qualified backfilled sand layer through the reserved hole of the replacement support plate, and part of the soil is piled on the replacement support plate on both sides of the reserved hole. S4, Water Injection and Compaction: Use a water injection pipe with a diameter of 25mm-50mm to inject water into the soil in the hole of the replacement support plate from top to bottom, and submerge the backfill material in the water. On the one hand, this allows the uniform, loose, and permeable sand to be spread to the adjacent replacement support plate area, and on the other hand, it compacts the soil. During the water injection process, the settlement of the backfill material surface should be closely observed. After it stabilizes, continue to inject water for 5-10 minutes. S5, Vibration compaction: Insert a 30-100mm diameter immersion vibrator into the backfill material, following the principle of "quick insertion and slow withdrawal," vibrating while inserting downwards until it is 200-300mm below the surface of the lower backfill material. Hold for 30-60 seconds to ensure a good connection between the upper and lower backfill material layers. The withdrawal speed of the vibrator should be controlled within 1m / min, and the distance the vibrator moves each time should be 300-400mm. Each layer of backfill material should be vibrated at least twice. S6, Interlocking Backfill: After the unloading of the front hole is completed, water is injected and vibration is carried out on the backfill material of the hole, while the unloading and backfilling of the rear hole is carried out at the same time to achieve interlocking backfilling until the top layer of soil is unloaded and backfilled along the replacement support plate to the outdoor ground level. S7, Leveling and Acceptance: After each layer of backfill is completed, the surface should be leveled by stringing a line. Backfill material that exceeds the allowable deviation should be leveled according to the line in a timely manner. Backfill material that is lower than the specified elevation should be compacted according to the line, and the physical parameters of the compaction of the backfill material should be tested by using the ring cutter method.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the height of the conveying component can be adjusted by the pit cleaning equipment, thereby enabling the conveying component to better clean up the garbage generated during the pit cleaning process. The inclined setting of the support frame in the pit cleaning equipment can make the conveying component more stable under stress when carrying garbage. Furthermore, the guide wheel can improve the positioning and guiding effect of the winding wheel when winding the steel cable, thus making the lifting control effect of the conveying component better, the stress stability higher, and the overall performance and efficiency better when cleaning the pit.

[0016] 2. In this invention, the reinforcing support plates are provided on the left and right sides of the lower side of the reinforcing frame plate, which can make the reinforcing frame plate provide high stability for supporting the support frame, and make the support frame safe to use when supporting the conveying components. The limiting slot can realize the support and positioning of the guide plate, which can make the guide plate highly stable when the garbage is discharged, effectively prevent garbage from spilling, and effectively improve the efficiency of the pit cleaning.

[0017] 3. In this invention, the conveying assembly enables the loading and conveying of waste from the bottom of the foundation pit. Furthermore, the conveying assembly includes a bottom-cleaning hopper equipped with a discharge mechanism that allows for intermittent unloading of the waste inside the hopper. This effectively prevents the waste from accumulating and scattering as it is conveyed by the upper conveyor, thus preventing waste from spilling around the foundation pit and improving the construction quality. The matching configuration of the discharge roller with the inner cavity of the sealed transfer box effectively seals the transfer box, preventing sludge from flowing out and improving protection around the foundation pit. The star-shaped cross-section of the discharge roller allows for effective intermittent, segmented unloading of waste, ensuring efficient conveying and discharge of waste from the bottom of the foundation pit, thereby improving construction quality.

[0018] 4. In this invention, the foundation pit backfilling process utilizes replacement support strips for unloading and stockpiling soil. A layered, hole-by-hole, and progressively overlapping backfilling method is adopted, with water injection and vibration occurring simultaneously. During layered backfilling, sufficient water is injected, and under the action of water flow, the uniformly sized, loose, and highly permeable sand is spread to the adjacent replacement support strip area. At the same time, the full vibration of the vibrator accelerates the settlement of the sand, making the backfill dense. After the next layer of backfilling is completed, the backfilling of the previous layer of soil continues until the outdoor ground level is reached. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall main structure of the present invention; Figure 2 This is a schematic diagram of the overall rear view structure of the present invention; Figure 3 This is a schematic diagram of the foundation pit cleaning equipment of the present invention; Figure 4 This is a schematic diagram of the conveying component structure of the present invention; Figure 5 This is a schematic diagram of the unloading mechanism of the present invention; Figure 6 This is a schematic diagram of a portion of the unloading mechanism of the present invention; Figure 7 This is a schematic diagram of the backfilling process of the present invention.

[0020] In the diagram: 1. Pit cleaning equipment; 101. Loading base frame; 102. Loading support rod; 103. Support frame; 104. Reinforcing frame plate; 105. Mounting frame; 106. Winch motor; 107. Winding reel; 108. Transfer frame; 109. Guide wheel; 110. Reinforcing support plate; 111. Limiting slot; 2. Conveying assembly; 201. Pit cleaning hopper; 202. Positioning frame; 203. Transfer seat; 204. 205. First load-bearing shaft; 206. First limiting wheel; 207. Loading frame; 208. Second load-bearing shaft; 209. Second limiting wheel; 210. Guide plate; 211. Third load-bearing shaft; 212. Third limiting wheel; 213. Fourth load-bearing shaft; 214. Fourth limiting wheel; 3. Unloading mechanism; 301. Sealed transfer box; 302. Reinforcing seat; 303. Unloading shaft; 304. Unloading roller; 305. Unloading motor. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] Example: Please refer to Figure 1-7 The diagram illustrates a foundation pit backfilling process and foundation pit cleaning device, including a foundation pit cleaning device 1. The device 1 includes a support frame 101. Loading supports 102 are correspondingly arranged on the upper front left and right sides of the support frame 101. A support frame 103 is provided at the upper end of the loading supports 102. A reinforcing frame plate 104 is provided on the upper rear side of the support frame 103. An installation frame 105 is provided on the upper side of the reinforcing frame plate 104. A winch motor 106 is provided on the upper side of the installation frame 105. A winding wheel 107 is provided at the drive end of the winch motor 106. A transfer frame 108 is provided at the middle of the upper side of the support frame 103. Guide wheels 109 are installed on the transfer frame 108. The front side of the support frame 103 is equipped with a conveying component 2. The height of the conveying component 2 can be adjusted by the pit cleaning equipment 1, so that the conveying component 2 can better clean up the garbage generated during the pit cleaning. The inclined setting of the support frame 103 in the pit cleaning equipment 1 can make the conveying component 2 more stable under force when carrying garbage. In addition, under the action of the guide wheel 109, the winding wheel 107 can have a good positioning and guiding effect when winding the steel cable, so as to improve the lifting control effect of the conveying component 2, increase the stress stability, and make the overall use effect and efficiency better when cleaning the pit.

[0023] The support frame 103 is inclined, with an angle of 60° between the support frame 103 and the horizontal plane of the mounting base 101. Its function is that the inclined arrangement of the support frame 103 provides support for the cleaning bucket 201 during lifting, reduces the stress on the winch motor 106 when lifting the cleaning bucket 201, thus improving the safety of the winch motor 106 and enhancing the overall performance of the pit cleaning equipment 1.

[0024] The reinforcing frame 104 has reinforcing support plates 110 on its lower left and right sides, with the lower ends of the reinforcing support plates 110 being connected to the mounting base 101. The purpose of these support plates 110 is to ensure high stability of the reinforcing frame 104 in supporting the support frame 103, thereby enhancing the safety of the support frame 103 when supporting the conveying assembly 2.

[0025] The first limiting wheel 205 and the second limiting wheel 208 are located on the same horizontal plane and are connected to the inner cavity groove of the support frame 103. The fourth limiting wheel 213 is connected to the frame surface of the support frame 103, and the support frame 103 and the reinforcing frame plate 104 have limiting slots 111 corresponding to the third limiting wheel 211. The winding wheel 107, the guide wheel 109, and the adapter seat 203 are located on the same horizontal plane and are connected by ropes. Their function is to support and position the guide plate 209 through the limiting slots 111, ensuring high guiding stability of the guide plate 209 during waste discharge, effectively preventing waste spillage, and significantly improving the efficiency of pit cleaning.

[0026] In this embodiment, reference is made to Figure 1 and 4As shown in Figure 6, the conveying assembly 2 includes a bottom cleaning hopper 201. A positioning frame 202 is provided on the upper back side of the bottom cleaning hopper 201. An adapter 203 is installed in the middle of the positioning frame 202. A first load-bearing shaft 204 is arranged on the positioning frame 202 with the adapter 203 as the center, and a first limiting wheel 205 is installed on the outer end of the first load-bearing shaft 204. A loading frame 206 is provided on the lower side of the bottom cleaning hopper 201. A second load-bearing shaft 207 is arranged on the lower back side of the loading frame 206, and a second limiting wheel 208 is installed on the outer end of the second load-bearing shaft 207. A guide plate 209 is provided on the lower side of the loading frame 206, and a guide plate 209 is arranged on the lower back side of the guide plate 209. A third load-bearing shaft 210 is provided, and a third limiting wheel 211 is provided at the outer end of the third load-bearing shaft 210. A fourth load-bearing shaft 212 is provided at the corner of the side of the loading frame 206 near the second load-bearing shaft 207. A fourth limiting wheel 213 is provided at the outer end of the fourth load-bearing shaft 212. An unloading mechanism 3 is provided inside the loading frame 206. The unloading mechanism 3 includes a sealed transfer box 301. Reinforcing seats 302 are provided on both sides of the sealed transfer box 301. An unloading shaft 303 is installed inside the sealed transfer box 301 through the reinforcing seats 302. An unloading roller 304 is installed inside the sealed transfer box 301 through the unloading shaft 303. An unloading motor 305 is installed on one set of reinforcing seats 302. The conveying assembly 2 enables the loading and conveying of waste from the bottom of the foundation pit. Furthermore, the bottom cleaning hopper 201 in the conveying assembly 2 is equipped with a discharge mechanism 3, which enables the intermittent discharge of waste loaded inside the bottom cleaning hopper 201. This effectively prevents the waste from being unloaded and accumulated by the upper conveyor, thus preventing the waste from scattering around the foundation pit and improving the construction quality of the foundation pit.

[0027] The sealed transfer box 301 is positioned corresponding to the lower discharge port of the bottom cleaning hopper 201, and the drive end of the unloading motor 305 is connected to the unloading shaft 303 via a coupling. Its function is to seal the bottom of the bottom cleaning hopper 201 by positioning the sealed transfer box 301, thereby improving the loading and unloading effect of the bottom cleaning hopper 201 on the waste and enhancing the waste cleaning and transfer efficiency.

[0028] The unloading roller 304 is adapted to fit the inner cavity of the sealed transfer box 301, and its side cross-section has a star-shaped structure. The loading frame 206 has corresponding cavities that fit the sealed transfer box 301. Both ends of the sealed transfer box 301 are connected to the loading frame 206 via reinforcing seats 302. Its function is to effectively seal the sealed transfer box 301 by adapting the unloading roller 304 to its inner cavity, thereby preventing sludge from flowing out and improving the protection of the area around the pit. The star-shaped structure of the unloading roller 304's side cross-section allows for good intermittent, segmented unloading of waste, ensuring efficient conveying and discharge of waste from the pit bottom, thus effectively improving construction quality.

[0029] A foundation pit backfilling process, used to implement the aforementioned foundation pit bottom cleaning device, includes the following steps: S1, Backfill Area Cleaning: By hoisting and placing the foundation pit cleaning equipment 1 inside the foundation pit on the side, workers clean up the debris, basement exterior wall insulation board fragments, turf, tree roots and other debris from the bottom of the foundation pit and the support plate. They also remove the silt and soft soil from the pit. The specific steps are as follows: When using the pit cleaning equipment 1 for pit cleaning, the transition seat 203, guide wheel 109, and winding wheel 107 are first connected by steel cable. The steel cable is adjusted by the winch motor 106, so that the cleaning bucket 201 can be adjusted up and down on the support frame 103. When the cleaning bucket 201 moves to the lower side, the workers clean the accumulated garbage into the cleaning bucket 201. Then, the cleaning bucket 201 is lifted by the winch motor 106 to exceed the depth of the pit. When the cleaning bucket 201 is lifted to the top, the unloading motor 305 rotates the unloading shaft 303. Then, under the action of the unloading roller 304, the garbage inside the cleaning bucket 201 is unloaded and cleaned intermittently. Through the repeated driving of the cleaning bucket 201, the garbage generated during pit cleaning is cleaned and transported. Furthermore, when clearing the bottom of the foundation pit, a protective net should be set up around the pit to prevent garbage and debris from falling back into the backfill area. Debris blown in by strong winds should be cleaned up in time. S2, Soil Quality Inspection: Use uniformly sized, loose, and highly permeable sand, silt, fine stone, gravel, or sand-aggregate mix as backfill material. Silt, silty soil, and soil with an organic matter content greater than 6% are prohibited for backfilling. Clayey soil and silt should not be used for backfilling. Inspect the backfill material delivered to the site, removing debris and stones. Crushed stone or blasted rock with a particle size greater than 50mm should be broken up; if difficult to break, it should be removed. Furthermore, with a compaction coefficient ≥0.94, test the moisture content and dry density, which directly affect the compacted material quality. Moisture content should be controlled between 8-12%, and dry density should not be less than 1.6 g / cm³. 3 When the moisture content is greater than 12%, it should be loosened, air-dried, and then air-dried. S3, Soil unloading and backfilling: After the underground structure, exterior wall waterproofing and insulation construction are completed, soil is unloaded and backfilled in layers. Before backfilling, the corresponding height control line is marked in advance. After each layer is backfilled, the height control line is remarked. The thickness of each backfill layer should be controlled between 1m and 1.5m. When unloading soil, the rear of the dump truck is aligned with the reserved hole of the replacement support plate. Part of the soil is filled into the bottom of the foundation pit (trench) or the qualified backfilled sand layer through the reserved hole of the replacement support plate, and part of the soil is piled on the replacement support plate on both sides of the reserved hole. S4, Water Injection and Compaction: Use a water injection pipe with a diameter of 25mm-50mm to inject water into the soil in the hole of the replacement support plate from top to bottom, and submerge the backfill material in the water. On the one hand, this allows the uniform, loose, and permeable sand to be spread to the adjacent replacement support plate area, and on the other hand, it compacts the soil. During the water injection process, the settlement of the backfill material surface should be closely observed. After it stabilizes, continue to inject water for 5-10 minutes. S5, Vibration Compaction: Insert a 30-100mm diameter immersion vibrator into the backfill material, following the principle of "quick insertion and slow withdrawal," vibrating while inserting downwards until it penetrates 200-300mm below the surface of the next layer of backfill material. Hold for 30-60 seconds to ensure a good connection between the upper and lower layers of backfill material. The withdrawal speed should be controlled within 1m / min, and the vibrator should move 300-400mm each time. Each layer of backfill material should be vibrated at least twice to ensure thorough compaction and prevent any gaps in the vibration, thus guaranteeing the density of the backfill material. S6, Interlocking Backfill: After the unloading of the front hole is completed, water is injected and vibration is carried out on the backfill material of the hole, while the unloading and backfilling of the rear hole is carried out at the same time to achieve interlocking backfilling until the top layer of soil is unloaded and backfilled along the replacement support plate to the outdoor ground level. S7, Leveling and Acceptance: After each layer of backfill is completed, the surface should be leveled by stringing a line. Backfill material that exceeds the allowable deviation of the backfill level line should be leveled according to the line in a timely manner. Backfill material that is lower than the specified elevation should be compacted according to the line. The physical parameters of the backfill material density should be tested using the ring cutter method.

[0030] The backfilling process utilizes replacement support strips for unloading and stockpiling soil. A layered, perforated, and progressively overlapping backfilling method is employed, with water injection and vibration occurring simultaneously. During layered backfilling, ample water is injected, and the water flow causes the uniformly sized, loose, and highly permeable sand to be spread to the adjacent replacement support strip area. At the same time, the vibrator accelerates the settlement of the sand, making the backfill dense. After the next layer of backfilling is completed, the backfilling of the previous layer continues until the outdoor ground level is reached.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A foundation pit cleaning device, comprising foundation pit cleaning equipment (1), characterized in that: The pit cleaning equipment (1) includes a mounting base (101), with loading support rods (102) arranged on the upper front side of the mounting base (101) on the left and right sides respectively. A support frame (103) is arranged at the upper end of the loading support rods (102), and a reinforcing frame plate (104) is arranged on the upper rear side of the support frame (103). An installation frame (105) is arranged on the upper side of the reinforcing frame plate (104), and a hoisting motor (106) is arranged on the upper side of the installation frame (105). A winding wheel (107) is arranged at the drive end of the hoisting motor (106). A transfer frame (108) is arranged at the middle of the upper side of the support frame (103), and a guide wheel (109) is installed on the transfer frame (108). A conveying assembly (2) is installed on the front side of the support frame (103). The conveying assembly (2) includes a bottom cleaning container (201). A positioning frame (202) is provided on the upper back side of the bottom cleaning container (201). An adapter (203) is installed in the middle of the positioning frame (202). A first load-bearing shaft (204) is provided on the positioning frame (202) with the adapter (203) as the center. A first limit wheel (205) is installed on the outer end of the first load-bearing shaft (204). A loading frame (206) is provided on the lower side of the bottom cleaning container (201). A second load-bearing shaft (207) is provided on the lower back side of the loading frame (206) with the left and right sides corresponding to the left and right sides. The outer end of the second load-bearing shaft (207) is provided with a second limiting wheel (208), the lower side of the loading frame (206) is provided with a guide plate (209), the lower left and right sides of the guide plate (209) are provided with a third load-bearing shaft (210), the outer end of the third load-bearing shaft (210) is provided with a third limiting wheel (211), the side of the loading frame (206) near the corner of the second load-bearing shaft (207) is provided with a fourth load-bearing shaft (212), the outer end of the fourth load-bearing shaft (212) is provided with a fourth limiting wheel (213), and the interior of the loading frame (206) is provided with a unloading mechanism (3). The unloading mechanism (3) includes a sealed transfer box (301), with reinforcing seats (302) provided on both sides of the sealed transfer box (301), an unloading shaft (303) installed inside the sealed transfer box (301) through the reinforcing seats (302), and an unloading roller (304) installed inside the sealed transfer box (301) through the unloading shaft (303). An unloading motor (305) is installed on one set of the reinforcing seats (302). The support frame (103) is inclined, and the angle between the support frame (103) and the horizontal plane of the mounting base (101) is 60°; The first limiting wheel (205) and the second limiting wheel (208) are located on the same horizontal plane, and the first limiting wheel (205) and the second limiting wheel (208) are connected to the inner cavity groove of the support frame (103). The fourth limiting wheel (213) is provided corresponding to the frame of the support frame (103), and the support frame (103) and the reinforcing frame plate (104) are provided with limiting slots (111) corresponding to the third limiting wheel (211). The winding reel (107), guide wheel (109), and adapter (203) are arranged on the same horizontal plane, and the winding reel (107), guide wheel (109), and adapter (203) are connected by ropes. The unloading roller (304) is adapted to the inner cavity of the sealed transfer box (301), and the side cross-section of the unloading roller (304) is arranged in a star shape.

2. The foundation pit cleaning device according to claim 1, characterized in that: The lower side of the reinforcing frame plate (104) is provided with reinforcing support plates (110) on the left and right sides respectively, and the lower end of the reinforcing support plate (110) is connected to the mounting base (101).

3. The foundation pit cleaning device according to claim 1, characterized in that: The sealed transfer box (301) is set with the discharge port on the lower side of the bottom cleaning hopper (201) corresponding to each other, and the drive end of the unloading motor (305) is connected to the unloading shaft (303) via a coupling.

4. The foundation pit cleaning device according to claim 1, characterized in that: The loading frame (206) has a cavity that matches the sealed transfer box (301) inside. The two ends of the sealed transfer box (301) are connected to the loading frame (206) through a reinforcing seat (302).

5. A foundation pit backfilling process for implementing a foundation pit bottom cleaning device as described in any one of claims 1-4, characterized in that: Includes the following steps: S1, Backfill Area Cleaning: By hoisting the pit cleaning equipment (1) and placing it inside the pit on the side, the workers cleaned up the garbage, basement exterior wall insulation board fragments, turf, tree roots and debris on the bottom of the pit and the support plate, and removed the pit silt and loose soil layer. The specific steps are as follows: When cleaning the pit, the pit cleaning equipment (1) is used. First, the transfer seat (203), guide wheel (109) and winding wheel (107) are connected by steel cable. The steel cable is adjusted by the hoisting motor (106) so that the cleaning bucket (201) is on the support frame (103). With vertical adjustment, when the bottom cleaning hopper (201) moves to the lower side, the workers clean up the accumulated garbage into the bottom cleaning hopper (201). Then, the hoisting motor (106) lifts the bottom cleaning hopper (201) over the depth of the pit. When the bottom cleaning hopper (201) is lifted to the top, the unloading motor (305) rotates the unloading shaft (303). Then, under the action of the unloading roller (304), the garbage inside the bottom cleaning hopper (201) is unloaded and cleaned intermittently. Through the repeated driving of the bottom cleaning hopper (201), the garbage generated from the bottom cleaning of the pit is cleaned and transported. Furthermore, when cleaning the foundation pit, protective netting should be set up around the pit to prevent garbage and debris from falling back into the backfill area. Debris blown in by strong winds should be cleaned up in time. S2, Soil quality inspection: Sand, silt, fine stone, gravel, and sand-stone mixture with uniform, loose, and highly permeable particles should be selected as backfill material. Silt, silty soil, and soil with an organic matter content greater than 6% should not be used for backfilling. Clay soil and silt should not be used for backfilling. The backfill material delivered to the site should be inspected, and debris and stones should be removed. Crushed stone or blasted rock with a particle size greater than 50mm should be broken up; if it is difficult to break, it should be removed. With a compaction coefficient ≥0.94, the moisture content and dry density, which directly affect the compacted material quality, should be tested. The moisture content should be controlled between 8-12%, and the dry density should not be less than 1.6g / cm³. 3 When the moisture content is greater than 12%, it should be loosened, air-dried, and then air-dried. S3, Soil unloading and backfilling: After the underground structure, exterior wall waterproofing and insulation construction are completed, soil is unloaded and backfilled in layers. Before backfilling, the corresponding height control line is marked in advance. After each layer is backfilled, the height control line is remarked. The thickness of each backfill layer should be controlled between 1m and 1.5m. When unloading soil, the rear of the dump truck is aligned with the reserved hole of the replacement support plate. Part of the soil is filled into the bottom of the foundation pit or the backfilled qualified sand layer through the reserved hole of the replacement support plate, and part of the soil is piled on the replacement support plate on both sides of the reserved hole. S4, Water Injection and Compaction: Use a water injection pipe with a diameter of 25mm-50mm to inject water into the soil in the hole of the replacement support plate from top to bottom, and submerge the backfill material in the water. On the one hand, this allows the uniform, loose, and permeable sand to be spread to the adjacent replacement support plate area, and on the other hand, it compacts the soil. During the water injection process, the settlement of the backfill material surface should be closely observed. After it stabilizes, continue to inject water for 5-10 minutes. S5, Vibration compaction: Insert a 30-100mm diameter immersion vibrator into the backfill material, following the principle of "quick insertion and slow withdrawal". Vibrate while inserting downwards until it is 200-300mm below the surface of the lower layer of backfill material. Hold for 30-60 seconds to ensure a good connection between the upper and lower layers of backfill material. The speed of withdrawing the vibrator should be controlled within 1m / min. The distance the vibrator moves each time should be 300-400mm. Each layer of backfill material should be vibrated at least twice. S6, Interlocking Backfill: After the unloading of the front hole is completed, water is injected and vibration is carried out on the backfill material of the hole, while the unloading and backfilling of the rear hole is carried out at the same time to achieve interlocking backfilling until the top layer of soil is unloaded and backfilled along the replacement support plate to the outdoor ground level. S7, Leveling and Acceptance: After each layer of backfill is completed, the surface should be leveled by stringing a line. Backfill material that exceeds the allowable deviation should be leveled according to the line in a timely manner. Backfill material that is lower than the specified elevation should be compacted according to the line, and the physical parameters of the compaction of the backfill material should be tested by using the ring cutter method.

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