Pile hole backfilling construction method

Abstract

The invention belongs to the technical field of building construction, and discloses a pile hole backfilling construction method. When the pile hole is filled, first filling materials are firstly filled to form a first filling layer, drilling equipment is inserted into the bottom of the pile hole, then the drilling equipment is controlled to rotate anticlockwise to compact the first filling layer, the pile hole is filled with the first filling materials again to form a second filling layer, and meanwhile the drilling equipment is controlled to rotate anticlockwise to compact the second filling layer for the first time; and then the drilling equipment is controlled to vibrate the second filling layer to conduct secondary compaction, whether the compaction quality of the second filling layer is qualified or not is judged, the operation is repeated till the drill bit moves to the upper end of the pile hole, finally, the drilling equipment is moved out of the pile hole, and top sealing and compaction are conducted on the pile hole. When the construction method is used for backfilling the pile hole, cavities can be prevented from being generated in the pile hole, the pile hole can be uniformly backfilled, the reinforcing effect after the pile hole is filled is guaranteed, excessive settlement of a foundation is prevented, and the construction period is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a pile hole backfilling construction method. Background Art

[0002] During construction, it is often necessary to renovate, expand or rebuild existing buildings. Such projects require the demolition of the old pile foundations of the existing buildings, and then densely backfilling the pile holes of the old pile foundations so that new pile foundations can be reconstructed on the original site.

[0003] In the prior art, a commonly used method for backfilling old pile holes is to clean the old pile holes after the old pile foundation is pulled out, retaining some of the mud and water in the old pile holes. Cement slurry is then injected into the old pile holes, and the mud and water in the old pile holes are stirred using a mixing device. The backfill is then allowed to solidify, thereby completing the backfilling of the old pile holes. Using this backfilling method to backfill old pile holes can cause the pile hole sidewalls to collapse during the mixing of the mud and water and cement slurry, destroying the integrity of the hole wall and creating voids within the pile hole. It can even cause groundwater to flow into the pile hole, diluting the cement slurry and affecting its solidification, resulting in uneven backfill within the pile hole and causing excessive foundation settlement. Summary of the Invention

[0004] The purpose of the present invention is to provide a pile hole backfill construction method, which can avoid the generation of voids in the pile hole and can evenly backfill the pile hole, ensure the reinforcement effect after the pile hole is filled, prevent excessive settlement of the foundation, and shorten the construction period.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A pile hole backfill construction method is provided, comprising the following steps:

[0007] S1, filling a first filling material into the pile hole until the filling amount of the first filling material in the pile hole reaches a first preset filling amount, so as to form a first filling layer;

[0008] S2. Inserting a drilling device into the pile hole, the drilling device comprising a drill bit, a drill rod, and a material-discharging blade, wherein the drill bit is connected to the lower end of the drill rod, the material-discharging blade is circumferentially arranged around the drill rod, and the material-discharging blade extends spirally along the axial direction of the drill rod, and the drill rod is controlled to rotate clockwise so that the drill bit drills vertically downward to the bottom of the pile hole;

[0009] S3, controlling the drill rod to rotate counterclockwise at a preset torque and a preset speed, and applying a preset pressure to the drill rod vertically downward to compact the first filling layer;

[0010] S4, filling the pile hole with a second preset filling volume of the first filling material to form a second filling layer, and the drill rod drives the material-dispensing blade to rotate counterclockwise so that the material-dispensing blade conveys the first filling material to below the drill bit until the second filling layer pushes the drill rod upward vertically, thereby initially compacting the second filling layer;

[0011] S5. Controlling the drill rod to stop rotating, applying a preset impact vibration force vertically downward to the drill rod, and setting a preset vibration time, wherein the drilling equipment vibrates the second filling layer with the preset impact vibration force and the preset vibration time, so as to secondary compact the second filling layer;

[0012] S6. Determine whether the compaction quality of the second filling layer is qualified. If so, execute S7; if not, return to execute S5;

[0013] S7, repeating steps S4 to S6 until the drill bit moves to the upper end of the pile hole;

[0014] S8. Move the drilling equipment out of the pile hole, and cap and compact the pile hole.

[0015] Optionally, a pressure detection module is provided on the drill bit, the pressure detection module is communicatively connected with the control module, and the pressure detection module is used to detect the vertical pressure of the drill bit on the first filler;

[0016] The drill rod is provided with a displacement detection module, the displacement detection module is communicatively connected with the control module, and the displacement detection module is located above the ground. The displacement detection module is used to detect the vertical displacement of the drilling equipment. The step S6 specifically includes the following steps:

[0017] S61, vertically lifting the drilling equipment to separate the drill bit from the second filling layer;

[0018] S62, vertically downwardly drilling the drilling equipment until the drill bit contacts the first filling material of the second filling layer, the control module controlling the pressure detection module and the displacement detection module to turn on, applying a preset load to the drilling equipment, and setting a preset detection time, and the drill bit is inserted into the second filling layer at the preset load and the preset detection time;

[0019] S63, recording the detection results of the pressure detection module and the displacement detection module within the preset detection time, and drawing a pressure-displacement curve;

[0020] S64: Determine whether the compaction quality of the second filling layer is qualified based on the pressure-displacement curve. If so, execute S7; if not, return to execute S5.

[0021] Optionally, step S6 further includes step S65, which is performed after step S64 is performed and before step S7 is performed. Step S65 specifically includes the following steps:

[0022] S651, observe whether groundwater has seeped into the pile hole, if so, execute S652, if not, execute S7;

[0023] S652: Filling the pile hole with a second filler until the filling amount of the second filler reaches a third preset filling amount, wherein the permeability of the second filler is lower than the permeability of the first filler;

[0024] S653: Control the drilling equipment to press down the second filling material to compact the second filling material, and then return to execute S651.

[0025] Optionally, the first filler includes natural soil filler, and / or the second filler includes fine silt filler.

[0026] Optionally, the material-moving blade includes a first blade portion and a second blade portion that are connected, the first blade portion and the second blade portion are both circumferentially arranged on the drill rod and spirally extended along the axial direction of the drill rod, the first blade portion is arranged at one end of the drill rod close to the drill bit, and the blade thickness of the first blade portion is not less than 3 times the blade thickness of the second blade portion.

[0027] Optionally, a plurality of guide members are arranged at intervals on the first blade portion along its extension direction, the guide members are connected to the side walls of the first blade, the guide members are provided with guide slopes, the guide slopes extend radially and the inclination direction of the guide slopes is consistent with the inclination direction of the first blade portion.

[0028] Optionally, the drilling equipment also includes a compacting part, which is arranged on the side wall of the drill bit. The compacting part includes a first compacting part and a second compacting part. The first compacting part extends axially along the drill rod, and the second compacting part is connected to the lower end of the first compacting part at a preset angle, and the preset angle is 45° to 60°.

[0029] Optionally, the first compacting part, the second compacting part and the outer wall of the drill bit are all provided with anti-sticking protrusions.

[0030] Optionally, a conductive rod is provided in the pile hole, the lower end of the conductive rod is inserted into the first filling layer, the upper end of the conductive rod is electrically connected to the positive pole of the external power supply through a conductive wire group, and the negative pole of the external power supply is electrically connected to the drill rod.

[0031] Optionally, a vertical distance between the lower end of the conductive rod and the lower end of the drill bit is less than or equal to 2 times the pile hole radius.

[0032] Beneficial effects of the present invention:

[0033] The present invention provides a pile hole backfill construction method for filling and reinforcing pile holes. When filling the pile hole, a first filler is prepared in advance and first filled into the pile hole until the filling amount of the first filler reaches a first preset filling amount. This is the initial addition of the first filler. This portion of the first filler forms a first filling layer. Thereafter, a drilling device is inserted into the pile hole and the drilling device is controlled to rotate clockwise so as to drill down to the bottom of the pile hole. The drilling device is then controlled to rotate counterclockwise at a preset torque and a preset speed and a preset pressure is applied thereto so that the drilling device compacts the first filling layer. A second preset filling amount of the first filler is then filled into the pile hole again. During the filling process of this portion of the first filler, the drilling device still maintains counterclockwise rotation at the preset torque and the preset speed. As a result, a part of the first filling material that is filled again is squeezed to the side wall of the pile hole, and the other part is transported and squeezed to the bottom of the drilling equipment by the material-dispensing blades. The first filling material that is filled again forms a second filling layer. When the second filling layer pushes the drill rod to rise vertically, the drilling equipment is controlled to stop rotating, and the drilling equipment is vibrated and compacted with a preset impact vibration force and a preset vibration time. Then, the compaction quality of the second filling layer is checked to see if it is qualified. If it is unqualified, the second filling layer is vibrated and compacted again. If it is qualified, the above-mentioned operation steps of adding the first filling material again are repeated until the drilling equipment moves to the upper end of the pile hole. Finally, the drilling equipment is moved out of the pile hole, and the pile hole is capped and compacted.

[0034] The aforementioned pile hole backfill construction method controls the counterclockwise rotation of the drilling rig, causing the material-dispensing blades to deliver the first filler to the bottom of the drilled hole. The first filler is then applied in multiple layers along the axial direction of the pile hole. Each layer of the first filler is vibrated and compacted, resulting in uniform backfill of the pile hole. This ensures that there are no voids within the filled pile hole, resulting in a reliable reinforcement effect and preventing excessive foundation settlement. Furthermore, there is no need to wait for the first filler to cure, thus shortening the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a first flow chart of the pile hole backfill construction method provided by an embodiment of the present invention;

[0036] Figure 2 This is a first structural schematic diagram of the pile hole backfill construction method provided by an embodiment of the present invention when constructing a first filling layer;

[0037] Figure 3 This is a second flow chart of the pile hole backfill construction method provided by an embodiment of the present invention;

[0038] Figure 4 is a structural diagram of a drilling device provided by an embodiment of the present invention;

[0039] Figure 5 is a schematic structural diagram of a guide member provided by an embodiment of the present invention;

[0040] Figure 6 This is a second structural schematic diagram of the pile hole backfill construction method provided by an embodiment of the present invention during the construction of the first filling layer.

[0041] In the picture:

[0042] 1. Pile hole;

[0043] 2. First filling material;

[0044] 3. Drilling equipment; 31. Drill bit; 32. Drill rod; 33. Material-discharging blade; 331. First blade portion; 332. Second blade portion; 333. Guide member; 3331. Guide slope; 34. Compacting member;

[0045] 4. Conductive rod;

[0046] 5. External power supply. DETAILED DESCRIPTION

[0047] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0048] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0049] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0050] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0051] This embodiment provides a pile hole backfill construction method, such as Figures 1 to 6 As shown, using this construction method to fill and reinforce the pile hole 1 can not only avoid damaging the integrity of the hole wall and ensure the bearing capacity of the surrounding soil, but also evenly backfill the pile hole 1 to ensure the reinforcement effect after the pile hole 1 is filled, prevent excessive settlement of the foundation, and shorten the construction period.

[0052] The pile hole backfill construction method includes the following steps:

[0053] S1. See Figure 1 and Figure 2 As shown, the first filling material 2 is filled into the pile hole 1 until the filling amount of the first filling material 2 in the pile hole 1 reaches a first preset filling amount to form a first filling layer;

[0054] S2. See Figure 1 and Figure 2 As shown, a drilling device 3 is inserted into the pile hole 1. The drilling device 3 includes a drill bit 31, a drill rod 32, and a material-discharging blade 33. The drill bit 31 is connected to the lower end of the drill rod 32. The material-discharging blade 33 is circumferentially arranged on the drill rod 32 and spirally extends along the axial direction of the drill rod 32. The drill rod 32 is controlled to rotate clockwise so that the drill bit 31 drills vertically downward to the bottom of the pile hole 1.

[0055] S3, see Figure 1 As shown, the drill rod 32 is controlled to rotate counterclockwise at a preset torque and a preset speed, and a preset pressure is applied to the drill rod 32 vertically downward to compact the first filling layer;

[0056] S4. See Figure 1 As shown, a second preset amount of the first filling material 2 is filled into the pile hole 1 to form a second filling layer. The drill rod 32 drives the material-dispensing blade 33 to rotate counterclockwise, so that the material-dispensing blade 33 conveys the first filling material 2 to the bottom of the drill bit 31 until the second filling layer pushes the drill rod 32 to rise vertically, thereby initially compacting the second filling layer.

[0057] S5. See Figure 1 As shown, the drill rod 32 is controlled to stop rotating, a preset impact vibration force is applied to the drill rod 32 in a vertical downward direction, and a preset vibration time is set. The drilling device 3 vibrates the second filling layer with the preset impact vibration force and the preset vibration time to secondary compact the second filling layer;

[0058] S6. See Figure 1 As shown, determine whether the compaction quality of the second filling layer is qualified. If so, execute S7; if not, return to execute S5;

[0059] S7, see Figure 1 As shown, steps S4 to S6 are repeated until the drill bit 31 moves to the upper end of the pile hole 1;

[0060] S8, see Figure 1 As shown, the drilling equipment 3 is moved out of the pile hole 1, and the pile hole 1 is capped and compacted.

[0061] After removing the pile foundation of the original building, the pile hole 1 needs to be cleaned, and then the filling work of the pile hole 1 can be started. When filling the pile hole 1, the first filling material 2 is prepared in advance, and the first filling material 2 is first filled into the pile hole 1 until the filling amount of the filled first filling material 2 reaches the first preset filling amount. This is the initial addition of the first filling material 2. This part of the first filling material 2 forms a first filling layer. Then the drilling equipment 3 is inserted into the pile hole 1, and the drilling equipment 3 is controlled to rotate clockwise so that it drills down to the bottom of the pile hole 1. Then, the drilling equipment 3 is controlled to rotate counterclockwise at a preset torque and a preset speed, and a preset pressure is applied to it, so that the drilling equipment 3 compacts the first filling layer, and the second preset filling amount of the first filling material 2 is filled into the pile hole 1 again. During the filling process of this part of the first filling material 2, the drilling equipment 3 still keeps rotating counterclockwise at a preset torque and a preset speed. , so that a part of the first filling material 2 filled again is squeezed to the side wall of the pile hole 1, and the other part is transported and squeezed to the bottom of the drilling equipment 3 by the material-dispensing blade 33. The first filling material 2 filled again forms a second filling layer. When the second filling layer pushes the drill rod 32 to rise vertically, the drilling equipment 3 is controlled to stop rotating, and the drilling equipment 3 is vibrated and compacted with a preset impact vibration force and a preset vibration time. Then, the compaction quality of the second filling layer is detected to see if it is qualified. If it is unqualified, the second filling layer is vibrated and compacted again. If it is qualified, the above-mentioned operation steps of adding the first filling material 2 again are repeated until the drilling equipment 3 moves to the upper end of the pile hole 1. Finally, the drilling equipment 3 is moved out of the pile hole 1, and the pile hole 1 is capped and compacted.

[0062] The pile hole backfill construction method controls the counterclockwise rotation of the drilling device 3, causing the material-dispensing blades 33 to deliver the first filler 2 to the bottom of the drilled hole. The first filler 2 is then layered multiple times along the axial direction of the pile hole 1. Each layer of the first filler 2 is vibrated and compacted, resulting in uniform backfill of the pile hole 1. This ensures that there are no voids within the filled pile hole 1, resulting in a reliable reinforcement effect and preventing excessive foundation settlement. Furthermore, there is no need to wait for the first filler 2 to cure, thereby shortening the construction period.

[0063] It should be noted that the first preset filling amount and the second preset filling amount are determined based on factors such as the geological conditions of the excavation location of the pile hole 1, the depth and diameter of the pile hole 1, and the specific conditions of the construction site. In this embodiment, when the first filler 2 of the first preset filling amount is filled in the pile hole 1, the filling height in the pile hole 1 is at least 2m, and when the first filler 2 of the second preset filling amount is filled in the pile hole 1, the filling height in the pile hole 1 is at least 0.5m. In addition, the drill rod 32 rotates counterclockwise at a preset torque and a preset speed, and compacts the first filling layer at a preset pressure. After conversion, the vertical pressure of the drill rod 32 on the first filling layer needs to be greater than or equal to 500kN / m 2 , radial pressure must be greater than or equal to 250kN / m2 .

[0064] Optionally, a pressure detection module is provided on the drill bit 31. The pressure detection module is in communication with the control module and is used to detect the vertical pressure exerted by the drill bit 31 on the first filler 2. A displacement detection module is provided on the drill rod 32 and is in communication with the control module. The displacement detection module is located above the ground. The displacement detection module is used to detect the vertical displacement of the drilling equipment 3. Step S6 specifically includes the following steps:

[0065] S61, see Figure 3 As shown, the drilling device 3 is lifted vertically to separate the drill bit 31 from the second filling layer;

[0066] S62, see Figure 3 As shown, the drilling device 3 is vertically downward until the drill bit 31 contacts the first filling material 2 of the second filling layer. The control module controls the pressure detection module and the displacement detection module to start, applies a preset load to the drilling device 3, and sets a preset detection time. The drill bit 31 is inserted into the second filling layer at the preset load and preset detection time.

[0067] S63, see Figure 3 As shown, the detection results of the pressure detection module and the displacement detection module within the preset detection time are recorded, and a pressure-displacement curve is drawn;

[0068] S64, see Figure 3 As shown, whether the compaction quality of the second filling layer is qualified according to the pressure-displacement curve, if so, execute S7, if not, return to execute S5.

[0069] When filling the pile hole 1 in layers, the second filling layer will be vibrated and compacted each time the filling of the second filling layer is completed. Then the drilling equipment 3 will be lifted to separate the drill bit 31 of the drilling equipment 3 from the second filling layer, so that there is no contact between the second filling layer and the drill bit 31, to ensure the accuracy of the initial detection results of the pressure value and displacement value obtained in subsequent detection. Then the drilling equipment 3 will be drilled vertically downward until the drill bit 31 contacts the first filling material 2 of the second filling layer. The control module will then control the pressure detection module and the displacement detection module to start, apply a preset load to the drilling equipment 3, and set a preset detection time, so that the drill bit 31 is inserted into the second filling layer and continues to be inserted for the preset detection time. At the same time, the detection results of the pressure detection module and the displacement detection module within the preset detection time are recorded, and a pressure-displacement curve is drawn.

[0070] According to the pressure-displacement curve obtained above, it is possible to detect and judge whether the reinforcement quality of the current second filling layer is qualified. If the pressure-displacement curve is always in the elastic stage, that is, the pressure-displacement curve extends with the same slope, then the reinforcement quality is considered qualified, and then the filling of the next second filling layer can be continued. If the pressure-displacement curve shows a steep drop stage, that is, the pressure-displacement curve is a vertically extending straight line at a certain point, it is considered to have entered the steep drop stage, and the reinforcement quality is considered unqualified. The current second filling layer is vibrated and compacted again. After the quality is qualified, the filling of the next second filling layer can be carried out. In this way, the reinforcement quality of any second filling layer can be guaranteed, thereby ensuring the uniformity of the backfill of the pile hole 1 and avoiding excessive settlement of the foundation.

[0071] It should be noted that the preset detection time is determined based on factors such as the geological conditions of the excavation location of the pile hole 1, the depth and diameter of the pile hole 1, and the specific conditions of the construction site. In this embodiment, the preset detection time is set to be greater than or equal to 30 seconds and less than or equal to 60 seconds. The ultimate load value of each stratum can be obtained based on the geotechnical survey data provided by the actual construction site. When the preset load is applied to the drilling equipment 3, the depth of the stratum where the drill bit 31 is located is first determined, thereby determining the ultimate load value of the stratum corresponding to the current drill bit 31. The preset load value is 0.6 to 0.8 times the ultimate load value of the current corresponding stratum. If the corresponding stratum is a soft soil stratum, the preset load is 0.6 times the ultimate load value. Exemplarily, the pressure detection module includes a pressure sensor, and the displacement detection module includes a laser rangefinder and a height identification plate, and the height identification plate is fixed on the drill rod.

[0072] Optionally, step S6 further includes step S65. Step S65 is executed after step S64 and before step S7. Step S65 specifically includes the following steps:

[0073] S651, see Figure 3 As shown, observe whether groundwater seeps into pile hole 1. If so, execute S652; if not, execute S7;

[0074] S652, see Figure 3 As shown, the second filling material is filled into the pile hole 1 until the filling amount of the second filling material reaches a third preset filling amount, and the permeability of the second filling material is lower than the permeability of the first filling material 2;

[0075] S653, see Figure 3 As shown, the drilling device 3 is controlled to press down the second filling material to compact the second filling material, and then returns to execute S651.

[0076] When performing layered filling, after each second filling layer is filled and vibrated, it is necessary to observe whether groundwater has seeped into the pile hole 1. If groundwater has seeped in, it is necessary to fill the pile hole 1 with a third preset filling amount of the second filling material. Since the permeability of the second filling material is lower than that of the first filling material 2, the second filling material can block the groundwater and prevent the pile hole 1 wall from collapsing. After the filling is completed, the drilling equipment 3 is controlled to compact the second filling material. If there is no groundwater seepage, the reinforcement quality of the filled second filling layer is tested.

[0077] Exemplarily, the first filling material 2 comprises natural soil filler, and the second filling material comprises fine silt filler.

[0078] It should be noted that the third predetermined filling volume is determined based on factors such as the geological conditions at the excavation location of the pile hole 1, the depth and diameter of the pile hole 1, and specific conditions at the construction site. In this embodiment, when the second filler material of the third predetermined filling volume is filled into the pile hole 1, the filling height within the pile hole 1 is at least 0.2 m.

[0079] Alternatively, as Figure 1 and Figure 4 As shown, the material-dispensing blade 33 includes a first blade portion 331 and a second blade portion 332 connected to each other. Both the first blade portion 331 and the second blade portion 332 are circumferentially arranged around the drill rod 32 and extend helically along the axial direction of the drill rod 32. The first blade portion 331 is disposed at the end of the drill rod 32 near the drill bit 31. The thickness of the first blade portion 331 is not less than three times the thickness of the second blade portion 332. When the drilling equipment 3 conveys and compacts the first filler 2 (or second filler), the first filler 2 (or second filler) is primarily compacted by the first blade portion 331. By increasing the thickness of the first blade portion 331, the deformation resistance of the first blade portion 331 and the extrusion force on the first filler 2 (or second filler) can be effectively improved, thereby ensuring the compaction effect of the first filler 2 (or second filler) and the reinforcement quality of the pile hole 1.

[0080] Alternatively, as Figure 1 、 Figure 4 and Figure 5As shown, a plurality of guide members 333 are spaced apart along the first blade portion 331 along its extension direction. The guide members 333 are connected to the sidewalls of the first blade and are provided with guide slopes 3331. The guide slopes 3331 extend radially and are inclined in the same direction as the first blade portion 331. When the first filler 2 (or second filler) is filled into the pile hole 1 through the upper port of the pile hole 1, a portion of the first filler 2 (or second filler) is transported by the first and second blade portions 331, 332, to below the drill bit 31 and deposited at the bottom of the pile hole 1. The remaining portion is transported to the circumferential sidewalls of the pile hole 1 due to the rotation of the first and second blade portions 331, 332. By providing the guide member 333 and the guide slope 3331 that is consistent with the inclination direction of the first blade portion 331, the guiding effect of the first blade portion 331 on the first filler 2 (or the second filler) can be strengthened, so that the first filler 2 (or the second filler) is accurately transferred to the side wall of the pile hole 1, which is conducive to fully filling the pile hole 1 and avoiding the occurrence of voids.

[0081] Exemplarily, there are provided 10 guide members 333. In other embodiments, other numbers of guide members 333 may be provided according to actual needs, which is not limited here.

[0082] Alternatively, as Figure 1 As shown, the drilling equipment 3 also includes a compacting member 34. The compacting member 34 is disposed on the sidewall of the drill bit 31 and comprises a first compacting portion and a second compacting portion. The first compacting portion extends axially along the drill rod 32, and the second compacting portion is connected to the lower end of the first compacting portion at a preset angle. When compacting the first filler 2 (or second filler), a preset pressure is applied to the drill rod 32. By providing the compacting member 34, the drilling equipment 3 generates vertical and radial pressure on the first filler 2 (or second filler), thereby fully compacting the first filler 2 (or second filler) and ensuring the reinforcement effect on the pile hole 1.

[0083] Exemplarily, the preset angle is 45° to 60°.

[0084] Optionally, anti-sticking protrusions are provided on the outer walls of the first compacting portion, the second compacting portion, and the drill bit 31. The anti-sticking protrusions prevent the first filler 2 (or second filler) from adhering to the compacting member 34 and the drill bit 31, thereby preventing the first filler 2 (or second filler) from adhering to the compacting member 34 and the drill bit 31 and increasing the rotational resistance of the drill rod 32. This prevents the first filler 2 (or second filler) from being transported by the material-dispensing blades 33, thereby ensuring that the pile hole 1 is evenly filled.

[0085] In this embodiment, the anti-adhesion protrusion is a hemispherical protrusion, and the diameter of the hemispherical protrusion is 4mm to 8mm. In other embodiments, the anti-adhesion protrusion can also be set to other forms of protrusion structures such as diamond protrusions according to actual needs, which is not limited here.

[0086] like Figure 6 As shown, in some embodiments, a conductive rod 4 is provided in the pile hole 1. The lower end of the conductive rod 4 is inserted into the first filling layer, and the upper end of the conductive rod 4 is electrically connected to the positive electrode of the external power supply 5 via a conductive wire group, and the negative electrode of the external power supply 5 is electrically connected to the drill rod 32. When the pile hole 1 is filled, a closed circuit is formed between the conductive rod 4, the first filling layer, and the drill rod 32. When power is supplied by the external power supply 5, water molecules in the first filler 2 of the first filling layer migrate toward the cathode (drill rod 32) under the action of the electric field, thereby reducing the water content at the contact interface between the drill rod 32 and the first filling layer, reducing the thickness of the hydration film of the first filler 2, thereby weakening its adhesion, and preventing the first filler 2 from adhering to the drilling equipment 3.

[0087] It should be noted that when the second filling layer is filled into the pile hole 1, the conductive rod 4 is inserted into the second filling layer, and the drill bit 31 moves upward to the second filling layer. At this time, a closed circuit is formed by the conductive rod 4, the second filling layer and the drill rod 32.

[0088] Optionally, the vertical distance between the lower end of the conductive rod 4 and the lower end of the drill bit 31 is less than or equal to twice the radius of the pile hole 1. By controlling the vertical distance between the lower end of the conductive rod 4 and the lower end of the drill bit 31, it is possible to avoid excessive resistance caused by an excessive distance, avoid insufficient electric field strength that affects the migration of water molecules, ensure the power supply effect of the closed circuit, and prevent the first filler 2 from adhering to the drilling equipment 3.

[0089] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A pile hole backfill construction method, characterized in that: The following steps are involved: S1, filling a first filling material (2) into the pile hole (1) until the filling amount of the first filling material (2) in the pile hole (1) reaches a first preset filling amount, so as to form a first filling layer; S2. Inserting a drilling device (3) into the pile hole (1), the drilling device (3) comprises a drill bit (31), a drill rod (32) and a material-dispensing blade (33), wherein the drill bit (31) is arranged at the lower end of the drill rod (32) and connected thereto, and the material-dispensing blade (33) is circumferentially arranged around the drill rod (32) and spirally extends along the axial direction of the drill rod (32), and the drill rod (32) is controlled to rotate clockwise so that the drill bit (31) drills vertically downward to the bottom of the pile hole (1); S3, controlling the drill rod (32) to rotate counterclockwise at a preset torque and a preset speed, and applying a preset pressure to the drill rod (32) vertically downward to compact the first filling layer; S4, filling the pile hole (1) with a second preset filling amount of the first filling material (2) to form a second filling layer, the drill rod (32) drives the material-dispensing blade (33) to rotate counterclockwise, so that the material-dispensing blade (33) conveys the first filling material (2) to the bottom of the drill bit (31), until the second filling layer pushes the drill rod (32) to rise vertically, thereby initially compacting the second filling layer; S5, controlling the drill rod (32) to stop rotating, applying a preset impact vibration force in a vertical downward direction to the drill rod (32), and setting a preset vibration time, wherein the drilling device (3) vibrates the second filling layer with the preset impact vibration force and the preset vibration time, so as to secondary compact the second filling layer; S6. Determine whether the compaction quality of the second filling layer is qualified. If so, execute S7; if not, return to execute S5; S7, repeating steps S4 to S6 until the drill bit (31) moves to the upper end of the pile hole (1); S8. Move the drilling equipment (3) out of the pile hole (1), and cap and compact the pile hole (1).

2. The pile hole backfill construction method according to claim 1, characterized in that: The drill bit (31) is provided with a pressure detection module, the pressure detection module is communicatively connected to the control module, and the pressure detection module is used to detect the vertical pressure of the drill bit (31) on the first filler (2); The drill rod (32) is provided with a displacement detection module, the displacement detection module is communicatively connected to the control module, and the displacement detection module is located above the ground. The displacement detection module is used to detect the vertical displacement of the drilling device (3). The step S6 specifically includes the following steps: S61, vertically lifting the drilling device (3) to separate the drill bit (31) from the second filling layer; S62, the drilling device (3) is moved vertically downward until the drill bit (31) contacts the first filling material (2) of the second filling layer, the control module controls the pressure detection module and the displacement detection module to be turned on, a preset load is applied to the drilling device (3), and a preset detection time is set, and the drill bit (31) is inserted into the second filling layer at the preset load and the preset detection time; S63, recording the detection results of the pressure detection module and the displacement detection module within the preset detection time, and drawing a pressure-displacement curve; S64: Determine whether the compaction quality of the second filling layer is qualified based on the pressure-displacement curve. If so, execute S7; if not, return to execute S5.

3. The pile hole backfill construction method according to claim 2, characterized in that: The step S6 further includes step S65, which is executed after the step S64 is executed and before the step S7 is executed. The step S65 specifically includes the following steps: S651, observe whether groundwater seeps into the pile hole (1), if so, execute S652, if not, execute S7; S652, filling the pile hole (1) with a second filler until the filling amount of the second filler reaches a third preset filling amount, and the permeability of the second filler is lower than the permeability of the first filler (2); S653, control the drilling device (3) to press down the second filler to compact the second filler, and then return to execute S651.

4. The pile hole backfill construction method according to claim 3, characterized in that: The first filling material (2) comprises natural soil filler, and / or the second filling material comprises fine silt filler.

5. The pile hole backfill construction method according to any one of claims 1 to 4, characterized in that: The material-discharging blade (33) comprises a first blade portion (331) and a second blade portion (332) connected to each other. The first blade portion (331) and the second blade portion (332) are both circumferentially arranged on the drill rod (32) and spirally extended along the axial direction of the drill rod (32). The first blade portion (331) is arranged at one end of the drill rod (32) close to the drill bit (31). The blade thickness of the first blade portion (331) is not less than three times the blade thickness of the second blade portion (332).

6. The pile hole backfill construction method according to claim 5, characterized in that: A plurality of guide members (333) are arranged on the first blade portion (331) at intervals along its extension direction, the guide members (333) are connected to the side wall of the first blade, and the guide members (333) are provided with a guide slope (3331), the guide slope (3331) extends radially and tilted, and the tilt direction of the guide slope (3331) is consistent with the tilt direction of the first blade portion (331).

7. The pile hole backfill construction method according to any one of claims 1 to 4, characterized in that: The drilling equipment (3) further comprises a compacting member (34), the compacting member (34) being arranged on the side wall of the drill bit (31), the compacting member (34) comprising a first compacting portion and a second compacting portion, the first compacting portion extending axially along the drill rod (32), the second compacting portion being connected to the lower end of the first compacting portion at a preset angle, the preset angle being 45° to 60°.

8. The pile hole backfill construction method according to claim 7, characterized in that: The outer walls of the first compacting part, the second compacting part and the drill bit (31) are all provided with anti-sticking protrusions.

9. The pile hole backfill construction method according to any one of claims 1 to 4, characterized in that: A conductive rod (4) is provided in the pile hole (1), the lower end of the conductive rod (4) is inserted into the first filling layer, the upper end of the conductive rod (4) is electrically connected to the positive pole of an external power supply (5) through a conductive wire group, and the negative pole of the external power supply (5) is electrically connected to the drill rod (32).

10. The pile hole backfill construction method according to claim 9, characterized in that: The vertical distance between the lower end of the conductive rod (4) and the lower end of the drill bit (31) is less than or equal to twice the radius of the pile hole (1).

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