Building fat groove backfilling system

By using a stirring module and controller in the fertilizer tank to form a spiral filling layer, the problem of unstable backfill of the fertilizer tank is solved, the stability and anti-settlement capacity of the filling are improved, and the safety of the building structure is ensured.

CN120331266APending Publication Date: 2025-07-18SCEGC NO 5 CONSTRUCTION ENGINEERING GROUP COMPANYLTD +1
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Patent Information

Application Number
CN202510403956.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-01
Publication Date
2025-07-18

AI Technical Summary

Technical Problem

In the prior art, it is difficult to backfille the fertilizer trough on the side walls of the building foundation pit, resulting in insufficient backfilling, resulting in settlement of the fertilizer trough and infiltration of surface water, affecting the safety of the building structure.

Method used

The stirring module and controller are used to stir the filler through the set spiral motion trajectory to form filler layers of different structures, and the quality of the filler layer is detected through the analysis module to ensure that each filler layer meets the preset parameters before constructing the next layer.

Benefits of technology

The stability and compaction of fertilizer trough backfill are achieved, the stability and anti-settlement capacity of the fill are improved, surface water seepage is prevented, and the safety of the building structure is ensured.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a building fertilizer groove backfilling system, and belongs to the technical field of buildings, the building fertilizer groove backfilling system comprises: a stirring module, the stirring module is used for stirring various fillers in a fertilizer groove according to a set motion trail, so that the fillers form filling layers with different structures through the set motion trail; the controller is connected with the stirring mechanism and used for controlling the stirring mechanism to stir the filler according to a set first movement track and a set second movement track, so that the filler forms a first filling layer and a second filling layer corresponding to the movement tracks respectively; the analysis module is connected with the controller; the stirring mechanism is arranged to stir the filler backfilled into the fertilizer tank, and the filler forms filling layers with different structures through the set first movement track and the set second movement track, so that the structure of the filler is more stable on the basis of backfilling the fertilizer tank, and the filling efficiency is improved. And compared with manual backfilling, the filler is more tamped and stable.
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Description

Technical Field

[0001] The present invention relates to the field of construction technology, and particularly to a building backfill system for a fat groove. Background Art

[0002] With the development of the urbanization process, urban high-rise buildings are getting taller and the depth of foundation pit excavation is getting larger. After the completion of underground works, the backfill of the fat groove between the building and the side wall of the foundation pit has become a technical problem. The main reason is that the space of the fat groove is narrow, which is not conducive to the use of machinery by workers. When the backfill is completed manually using machinery, the backfill coefficient is often insufficient, resulting in settlement of the backfill soil in the later stage. This causes surface water to seep in along the cracking fissures, soaking the side wall of the foundation pit and affecting the structural safety and normal use of the building. Summary of the Invention

[0003] To solve the problems of the prior art, the present invention provides a building backfill system for a fat groove, including:

[0004] A stirring module, which is used to stir a variety of fillers in the fat groove according to a set movement trajectory, so that the fillers form filling layers with different structures through the set movement trajectory;

[0005] A controller, which is connected to the stirring mechanism and is used to control the stirring mechanism to stir the fillers according to a set first movement trajectory and a second movement trajectory, so that the fillers respectively form a first filling layer and a second filling layer corresponding to the movement trajectories;

[0006] An analysis module, which is connected to the controller and is used to detect the quality of the filling layer after it is formed;

[0007] Both the first movement trajectory and the second movement trajectory are in a spiral shape. The second movement trajectory is set based on the quality of the first filling layer formed by the first movement trajectory. If the quality of the first filling layer meets the preset parameters, the construction of the second filling layer is carried out.

[0008] Further, the movement trajectory is determined based on movement parameters, and the movement parameters at least include the stirring speed and the traveling speed of the stirring module.

[0009] Further, the analysis module includes: a data acquisition unit, a storage unit, and a comparison unit;

[0010] The data acquisition unit is used to collect the stirring speed and the traveling speed of the stirring module, as well as the surface hardness and surface humidity of the fillers after solidification within a set time, and send the collected data to the storage unit for storage;

[0011] The comparison unit and the storage unit are connected to the controller. A quality parameter is set in the comparison unit, and the quality parameter is used to determine whether the surface hardness and surface humidity of the filling layer collected by the data acquisition unit exceed the set quality parameter;

[0012] A first control mode and a second control mode are set in the storage unit. The first control mode is used to control the stirring module to form a first filling layer according to a set movement trajectory, and the second control mode is used to control the stirring module to form a second filling layer according to a set movement trajectory.

[0013] Further, after the filler solidifies within a preset time, the graphic acquisition unit acquires surface damage images at at least three points, and sends the acquired damage image data to the storage unit. A standard image is stored in the storage unit. The standard image is an image of any point obtained after applying a force A to the surface of the filling layer to cause damage under the premise of meeting the hardness and humidity after the filling layer solidifies within the preset time; the damage image is used to damage the surface of the filling layer by applying the force A, and the controller acquires the surface damage image and the standard image for comparison. If, after comparing the surface damage images of at least two points with the standard image, the average value of the damage area of the surface damage images of the two points ≥ the damage area of the standard image, or the depth of the damage area of the surface damage images of the two points ≤ the depth of the damage area of the standard image, it can be determined that the current filling layer meets the requirements after solidification, and the construction of the next filling layer can be carried out.

[0014] Further, the filler is a paste solid formed by mixing 20 - 30 parts of cement, 15 - 25 parts of fly ash, 10 - 20 parts of slag powder, 30 - 40 parts of fine sand, 3 - 8 parts of fiber reinforcement material, 2 - 5 parts of waterproofing agent, 1 - 3 parts of water reducing agent, and 15 - 25 parts of water.

[0015] Further, the stirring module includes: a stirring mechanism and a mixing bin;

[0016] The mixing bin is installed and connected to the stirring mechanism, and the mixing bin is arranged in front of the stirring mechanism;

[0017] The stirring mechanism is respectively connected to the controller and the analysis module;

[0018] The first control mode and the second control mode are set based on the stirring speed and the traveling speed of the stirring mechanism, and based on the feeding speed of the mixing bin.

[0019] Further, the stirring mechanism includes: a guide rail, a first servo motor, a rotating shaft, and a telescopic rod;

[0020] The guide rail is connected to the ground;

[0021] The output end of the first servo motor is connected to one end of the rotating shaft, and the other end of the rotating shaft is connected to the drill bit;

[0022] One end of the telescopic rod is connected to the first servo motor, and the other end of the telescopic rod is connected with a sliding plate, and the sliding plate is connected to the guide rail and the power mechanism;

[0023] The sliding plate is an L-shaped structure rotated 90° clockwise;

[0024] A chute is arranged on the top end face of the guide rail, and one end of the horizontal extension part of the sliding plate is connected to the bottom of the chute through a slider.

[0025] Further, the power mechanism includes: a second servo motor and a lead screw;

[0026] Along the linear motion direction of the stirring mechanism, support plates are symmetrically arranged at both ends of the guide rail. The lead screw is installed between the support plates, and both ends of the lead screw are respectively rotatably connected to the support plates. The second servo motor is connected to the support plate on one side of the guide rail, and the output end of the second servo motor is connected to one end of the lead screw;

[0027] The lower end of the longitudinal extension part of the sliding plate is threadedly connected to the lead screw.

[0028] Further, the drill bit includes: a main drill bit and an auxiliary drill bit;

[0029] The top of the main drill bit is connected to the rotating shaft connected to the output of the first servo motor, and the auxiliary drill bits are engaged on both sides of the main drill bit;

[0030] A base plate is arranged below the sliding plate, and the top of the base plate is connected to the bottom of the sliding plate through the telescopic rod;

[0031] The first servo motor is connected to the top of the base plate, the rotating shaft passes through the base plate, and both the main drill bit and the auxiliary drill bit are located below the base plate;

[0032] The top of the auxiliary drill bit is rotatably connected to the base plate through a shaft;

[0033] The centers of the main drill bit and the auxiliary drill bit are on the same cutting plane;

[0034] A material leveling mechanism is arranged at the two side edges of the base plate, and the main drill bit and the auxiliary drill bit are located in the middle area of the base plate.

[0035] Further, the cross sections of both the main drill bit and the auxiliary drill bit are isosceles trapezoid structures;

[0036] At the tops of the main drill bit and the auxiliary drill bit, gears that mesh with each other are provided, and the tops of the gears are connected to the rotating shaft;

[0037] Continuous spiral marks are provided on the surfaces of the main drill bit and the auxiliary drill bit.

[0038] Advantages of the present invention:

[0039] Through the provided stirring mechanism, the filling material backfilled into the fertilizer tank can be stirred, and different structural filling layers are formed for the filling material through the set first motion trajectory and second motion trajectory. Moreover, when each filling layer is constructed, the analysis module can determine whether the currently constructed filling layer meets the requirements. Thus, on the basis of realizing the backfilling of the fertilizer tank, the structure of the filling material is made more stable, and the filling material is more compacted and stable compared with manual backfilling. Description of the drawings

[0040] Figure 1 It is a schematic diagram of the principle framework of the backfilling system provided by the present invention;

[0041] Figure 2 It is a three-dimensional structure schematic diagram of the stirring mechanism provided by the present invention;

[0042] Figure 3 It is a top view structure schematic diagram of the stirring mechanism provided by the present invention;

[0043] Figure 4 It is a side view structure schematic diagram of the stirring mechanism provided by the present invention;

[0044] Figure 5 It is a schematic diagram of the drill bit connection structure provided by the present invention.

[0045] Reference numerals:

[0046] In the figure: 1 is a guide rail, 2 is the ground, 3 is the first servo motor, 4 is the rotating shaft, 5 is the telescopic rod, 6 is the sliding plate, 7 is the second servo motor, 8 is the lead screw, 9 is the main drill bit, 10 is the auxiliary drill bit, 11 is the base plate, and 12 is the gear. Detailed implementation manners

[0047] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0048] Embodiment 1

[0049] Please refer toFigure 1 , this application provides a building backfill system for the fat groove, including:

[0050] A stirring module, which is used to stir various fillers in the fat groove according to a set movement trajectory, so that the fillers form filling layers with different structures through the set movement trajectory;

[0051] A controller, which is connected to the stirring mechanism and is used to control the stirring mechanism to stir the fillers according to a set first movement trajectory and a second movement trajectory, so that the fillers respectively form a first filling layer and a second filling layer corresponding to the movement trajectories;

[0052] An analysis module, which is connected to the controller and is used to detect the quality of the filling layer after it is formed;

[0053] Both the first movement trajectory and the second movement trajectory are in a spiral trajectory. The second movement trajectory is set based on the quality of the first filling layer formed by the first movement trajectory. If the quality of the first filling layer meets the preset parameters, the construction of the second filling layer is carried out.

[0054] The movement trajectory is determined based on movement parameters, and the movement parameters at least include the stirring speed and the traveling speed of the stirring module.

[0055] The analysis module includes: a data acquisition unit, a storage unit, and a comparison unit;

[0056] The data acquisition unit is used to collect the stirring speed and the traveling speed of the stirring module, as well as the surface hardness and surface humidity of the filler after solidification within a set time, and send the collected data to the storage unit for storage;

[0057] The comparison unit and the storage unit are connected to the controller. Quality parameters are set in the comparison unit, and the quality parameters are used to determine whether the surface hardness and surface humidity of the filling layer collected by the data acquisition unit exceed the set quality parameters;

[0058] The storage unit is provided with a first control mode and a second control mode. The first control mode is used to control the stirring module to form a first filling layer according to a set movement trajectory, and the second control mode is used to control the stirring module to form a second filling layer according to a set movement trajectory.

[0059] In the above, the spiral trajectory is obtained according to the three-dimensional model of the fat groove. Specifically, the fat groove can be scanned by a three-dimensional scanning device first to obtain scanning data, and a point cloud is constructed based on the scanning data to form the construction of the three-dimensional model of the fat groove. The three-dimensional model of the fat groove is input into the controller, and is processed by the processing module set in the controller to obtain a spiral trajectory.

[0060] In the above, specifically, the processing module is based on the three-dimensional model of the fat groove, sets a horizontal plane, and this horizontal plane can cover the three-dimensional model of the fat groove in the horizontal direction. By extracting the fat groove contour and the corresponding coordinate data, when using the horizontal plane as the base plane of the fat groove contour, the fat groove contour is subjected to reverse mirroring processing to mirror all the irregular parts at the bottom of the fat groove contour onto the base plane, and the coordinate data is kept consistent throughout the process. Using the base plane as the backfill reference plane, in this way, without considering the size data of the fat groove itself, the depth during the backfill process can be dynamically adjusted (adjusted for any height backfill while ensuring the length and width dimensions are correct), and the irregular part at the bottom of the fat groove contour is kept as the reference plane during backfill.

[0061] Among them, the filler includes a slurry solid formed by mixing 20 - 30 parts of cement, 15 - 25 parts of fly ash, 10 - 20 parts of brick slag, 30 - 40 parts of fine sand, 3 - 8 parts of fiber reinforcement material, 2 - 5 parts of waterproofing agent, 1 - 3 parts of water-reducing agent, and 15 - 25 parts of water.

[0062] The first filling layer is located at the bottom layer. In the structure of the first filling layer, the brick slag is mainly distributed on the outside. In the structure of the second filling layer, the brick slag is evenly distributed. The filling layer can be set in multiple layers according to the actual situation, and the amount of brick slag in each filling layer from bottom to top gradually decreases.

[0063] After the filler solidifies within a preset time, at least three surface damage images at points are obtained by the image acquisition unit, and the obtained damage image data is sent to the storage unit. A standard image is stored in the storage unit. The standard image is an image of any point obtained after applying a force A to the surface of the filling layer to cause damage under the premise of meeting the hardness and humidity after the filling layer solidifies within the preset time. The damage image is used to damage the surface of the filling layer by applying the force A. The controller obtains the surface damage image and the standard image for comparison. If after comparing the surface damage images of at least two points with the standard image, the average value of the damage area of the surface damage images of the two points ≥ the damage area of the standard image, or the depth of the damage area of the surface damage images of the two points ≤ the depth of the damage area of the standard image, it can be determined that the current filling layer meets the requirements after solidification and the construction of the next filling layer can be carried out.

[0064] Example 2

[0065] See Figures 2 - 5 , the stirring module includes: a stirring mechanism and a mixing bin;

[0066] The mixing bin is installed and connected to the stirring mechanism, and the mixing bin is arranged in front of the stirring mechanism;

[0067] The stirring mechanism is respectively connected to the controller and the analysis module;

[0068] The first control mode and the second control mode are set based on the stirring speed and the traveling speed of the stirring mechanism, and based on the feeding speed of the mixing bin;

[0069] The stirring mechanism includes: a guide rail 1, a first servo motor 3, a rotating shaft 4 and a telescopic rod 5;

[0070] The guide rail 1 is located above the fat groove and is connected to the ground 2;

[0071] Both ends of the guide rail 1 are connected to the ground 2 through limit pieces, and a spirit level is arranged on the guide rail 1 for measuring whether the guide rail is horizontal after being connected to the ground, so as to ensure that the stirring of the filler by the stirring mechanism is more uniform;

[0072] The output end of the first servo motor 3 is connected to one end of the rotating shaft 4, and the other end of the rotating shaft 4 is connected to a drill bit;

[0073] One end of the telescopic rod 5 is connected to the first servo motor 3, the other end of the telescopic rod 5 is connected with a sliding plate 6, and the sliding plate 6 is connected to the guide rail 1 and the power mechanism;

[0074] The sliding plate 6 has an L-shaped structure rotated 90° clockwise.

[0075] A chute is arranged on the top end face of the guide rail 1, and one end of the horizontal extension part of the sliding plate 6 is connected to the bottom of the chute through a slider;

[0076] Among them, the first servo motor is used to drive the drill bit to rotate, so as to realize the stirring of the filler, reduce the gap between the filler and the fat groove, and make the filler more compact.

[0077] The function of the telescopic rod is to control the drill bit to lift towards the ground as the amount of the filler increases, so as to realize the stirring depth adapted to the thickness of the filler.

[0078] A power mechanism, the power structure is connected to the outside of the guide rail 1, and the output end of the power structure is connected to the stirring mechanism, and is used to drive the stirring mechanism to move linearly along the guide rail 1.

[0079] The power mechanism includes: a second servo motor 7 and a lead screw 8;

[0080] Along the linear motion direction of the stirring mechanism, support plates are symmetrically arranged at both ends of the guide rail 1. The lead screw 8 is installed between the support plates. Both ends of the lead screw 8 are rotatably connected to the support plates respectively. The second servo motor 7 is connected to the support plate on one side of the guide rail 1, and the output end of the second servo motor 7 is connected to one end of the lead screw 8; the lower end of the longitudinal extension of the sliding plate 6 is threadedly connected to the lead screw 8.

[0081] Wherein, when the second servo motor starts, it drives the lead screw to rotate, and the sliding plate is threadedly connected to the lead screw. Therefore, when the lead screw rotates, the sliding plate moves along the extension direction of the lead screw, thereby driving the stirring mechanism to move synchronously, thus realizing the stirring process of the filler.

[0082] The drill bit includes: a main drill bit 9 and an auxiliary drill bit 10;

[0083] The top of the main drill bit 9 is connected to the rotating shaft 4 connected to the output of the first servo motor 3, and the auxiliary drill bits 10 are meshed on both sides of the main drill bit 9;

[0084] A base plate 11 is arranged below the sliding plate 6, and the top of the base plate 11 is connected to the bottom of the sliding plate 6 through the telescopic rod 5;

[0085] The first servo motor 3 is connected to the top of the base plate 11. The rotating shaft 4 passes through the base plate 11. Both the main drill bit 9 and the auxiliary drill bit 10 are located below the base plate 11;

[0086] The top of the auxiliary drill bit 10 is rotatably connected to the base plate 11 through a shaft;

[0087] The centers of the main drill bit 9 and the auxiliary drill bit 10 are on the same section plane;

[0088] The cross-sections of both the main drill bit 9 and the auxiliary drill bit 10 are in an isosceles trapezoid structure;

[0089] Engaging gears 12 are arranged at the tops of both the main drill bit 9 and the auxiliary drill bit 10, and the tops of the gears 12 are connected to the rotating shaft 4;

[0090] Continuous spiral marks 13 are arranged on the surfaces of both the main drill bit 9 and the auxiliary drill bit 10.

[0091] Among them, the filler contains brick waste. It is very difficult to mix it evenly with ordinary mixing blades, and it causes great damage to the mixing blades. Therefore, the filler is stirred by a drill bit. When the drill bit rotates, the brick waste can be flung due to the action of centrifugal force. Thus, three drill bits can be set. During the stirring process, the brick waste can be stratified so that the brick waste is concentrated in the space between the main drill bit and the auxiliary drill bit. According to different rotation speeds of the drill bit, the brick waste can be distributed in different areas on the periphery of the drill bit, and thus the distribution position of the brick waste can be constructed according to the geological conditions, thereby improving the strength of the filling layer after solidification.

[0092] The both side edges of the substrate 11 are provided with a material leveling mechanism, and the main drill bit 9 and the auxiliary drill bit 10 are located in the middle area of the substrate 11.

[0093] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A building backfill system for foundation trenches, characterized in that, Including: A stirring module, which is used to stir various fillers in the backfill trench according to a set movement trajectory, so that the fillers form filling layers with different structures through the set movement trajectory; A controller, which is connected to the stirring mechanism and is used to control the stirring mechanism to stir the fillers according to a set first movement trajectory and a second movement trajectory, so that the fillers respectively form a first filling layer and a second filling layer corresponding to the movement trajectories; An analysis module, which is connected to the controller and is used to detect the quality of the filling layer after it is formed; Both the first movement trajectory and the second movement trajectory are in a spiral trajectory. The second movement trajectory is set based on the quality of the first filling layer formed by the first movement trajectory. If the quality of the first filling layer meets the preset parameters, the construction of the second filling layer is carried out.

2. The building backfill device according to claim 1, characterized in that The movement trajectory is determined based on movement parameters, and the movement parameters at least include the stirring speed and the traveling speed of the stirring module.

3. The building backfill device according to claim 1, wherein The analysis module includes: a data acquisition unit, a storage unit and a comparison unit; The data acquisition unit is used to acquire the stirring speed and the traveling speed of the stirring module, as well as the surface hardness and surface humidity of the filler after solidification within a set time, and send the acquired data to the storage unit for storage; The comparison unit and the storage unit are connected to the controller. A quality parameter is set in the comparison unit, and the quality parameter is used to judge whether the surface hardness and surface humidity of the filling layer acquired by the data acquisition unit exceed the set quality parameters; The storage unit is provided with a first control mode and a second control mode. The first control mode is used to control the stirring module to form a first filling layer according to a set movement trajectory, and the second control mode is used to control the stirring module to form a second filling layer according to a set movement trajectory.

4. The building backfill device according to claim 3, characterized in that, After the filler solidifies within a preset time, a surface damage image of at least three points is obtained through a graphic acquisition unit, and the obtained damage image data is sent to the storage unit. A standard image is stored in the storage unit. The standard image is an image of any point obtained after applying a force A to the surface of the filling layer to damage it under the premise of meeting the hardness and humidity after the filling layer solidifies within a preset time; the damage image damages the surface of the filling layer by applying a force A. The controller obtains the surface damage image and the standard image for comparison. If after comparing the surface damage images of at least two points with the standard image, the average value of the damaged area of the surface damage images of the two points ≥ the damaged area of the standard image, or the depth of the damaged area of the surface damage images of the two points ≤ the depth of the damaged area of the standard image, it can be determined that the current filling layer meets the requirements after solidification, and the construction of the next filling layer can be carried out.

5. The building backfill device according to claim 1, characterized in that, The filler is a paste solid formed by mixing 20 - 30 parts of cement, 15 - 25 parts of fly ash, 10 - 20 parts of slag powder, 30 - 40 parts of fine sand, 3 - 8 parts of fiber reinforcing material, 2 - 5 parts of waterproofing agent, 1 - 3 parts of water reducing agent and 15 - 25 parts of water.

6. The building backfill device according to claim 3, characterized in that, The stirring module includes: a stirring mechanism and a mixing bin; The mixing bin is installed and connected to the stirring mechanism, and the mixing bin is arranged in front of the stirring mechanism; The stirring mechanism is respectively connected to the controller and the analysis module; The first control mode and the second control mode are set based on the stirring speed and traveling speed of the stirring mechanism, and based on the feeding speed of the mixing bin.

7. The building backfill device according to claim 6, wherein, The stirring mechanism includes: a guide rail, a first servo motor, a rotating shaft and a telescopic rod; The guide rail is connected to the ground; The output end of the first servo motor is connected to one end of the rotating shaft, and the other end of the rotating shaft is connected to a drill bit; One end of the telescopic rod is connected to the first servo motor, and the other end of the telescopic rod is connected with a sliding plate, and the sliding plate is connected to the guide rail and the power mechanism; The sliding plate is an L-shaped structure rotated 90° clockwise; A chute is arranged on the top end surface of the guide rail, and one end of the horizontal extension part of the sliding plate is connected to the bottom of the chute through a slider.

8. The building backfill device according to claim 7, wherein, The power mechanism includes: a second servo motor and a lead screw; Along the linear motion direction of the stirring mechanism, supporting plates are symmetrically arranged at both ends of the guide rail, the lead screw is installed between the supporting plates, both ends of the lead screw are respectively rotatably connected to the supporting plates, the second servo motor is connected to the supporting plate on one side of the guide rail, and the output end of the second servo motor is connected to one end of the lead screw; The lower end of the longitudinal extension part of the sliding plate is threadedly connected to the lead screw.

9. The building backfill device according to claim 7, characterized in that, The drill bit includes: a main drill bit and an auxiliary drill bit; The top of the main drill bit is connected to the rotating shaft connected to the output of the first servo motor, and the auxiliary drill bits are engaged on both sides of the main drill bit; A base plate is arranged below the sliding plate, and the top of the base plate is connected to the bottom of the sliding plate through the telescopic rod; The first servo motor is connected to the top of the base plate, the rotating shaft passes through the base plate, and both the main drill bit and the auxiliary drill bit are located below the base plate; The top of the auxiliary drill bit is rotatably connected to the base plate through a shaft; The centers of the main drill bit and the auxiliary drill bit are on the same section plane; Uniform material mechanisms are arranged at both side edges of the base plate, and the main drill bit and the auxiliary drill bit are located in the middle area of the base plate.

10. The building backfill device according to claim 9, characterized in that, The cross sections of both the main drill bit and the auxiliary drill bit are in an isosceles trapezoid structure; Engaging gears are arranged at the tops of both the main drill bit and the auxiliary drill bit, and the tops of the gears are connected to the rotating shaft; Continuous spiral marks are arranged on the surfaces of both the main drill bit and the auxiliary drill bit.