Pile foundation pit side wall leveling excavation assembly and leveling method

Abstract

The invention relates to the technical field of foundation pit excavation, in particular to a pile foundation pit side wall leveling excavation assembly and a leveling method.A lifting base is installed on a cross beam in a lifting mode, a telescopic rod driven by a rotating motor is installed on the lifting base, a cutter head is arranged at the end of the telescopic rod, and multiple sets of obliquely-installed blades distributed in a circumferential array mode are arranged on the cutter head; the device has the beneficial effects that the excavation assembly is arranged, the side wall of a pile foundation pit is leveled and cleaned, soil on a reserved thin soil layer is cleaned through an iron brush roller, gravel rock blocks are exposed, the embedded gravel rock blocks are cleaned through cutting or clamping twisting of a knife skin, the excavation assembly is arranged, the excavation assembly is arranged, the excavation assembly is arranged, and the excavation assembly is arranged on the side wall of the pile foundation pit. In this way, collapse of the side wall cannot be caused, and a step layer at the bottom is formed after cleaning, so that follow-up post-pouring slurry is facilitated, and a flat surface is formed.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit excavation, and in particular to a pile foundation pit side wall leveling excavation component and a leveling method. Background Art

[0002] During the construction process, it is usually necessary to excavate a foundation pit at the construction site in order to lay the foundation. In the prior art, an excavator with a bucket is provided. The existing excavator can be used to achieve efficient and rapid foundation pit excavation.

[0003] However, for construction sites with a large amount of gravel or rock blocks underground, a large amount of gravel and rock blocks will remain on the side walls of the foundation pit after excavation. Especially for construction sites with piles inserted underground, when the excavation surface is excavated to the position of the piles, it is difficult to effectively level and clean the side walls of the foundation pit due to the obstruction of the piles, resulting in uneven side walls of the foundation pit, and the tips of the gravel and rock blocks are exposed, posing a safety hazard. For the side walls of the foundation pit that cannot be leveled and contain gravel and rock blocks, once it rains, they are severely eroded and easily cause landslides. Summary of the invention

[0004] The object of the present invention is to provide a pile foundation pit side wall leveling excavation component and a leveling method to solve the problems raised in the above-mentioned background technology.

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

[0006] A pile foundation pit side wall leveling excavation assembly comprises an excavation assembly, wherein the excavation assembly comprises a front frame and a rear frame which can be moved laterally, a recovery frame is connected between the front frame and the rear frame, a pair of forearm frames are arranged at the front end of the front frame, a flow guide assembly connected to the recovery frame is arranged at the lower end of the forearm frames, an iron brush roller driven by a driving motor is arranged on the forearm frames, a crossbeam is arranged between the pair of forearm frames, a lifting seat is installed on the crossbeam for lifting and lowering, a telescopic rod driven by a rotating motor is installed on the lifting seat, a cutter disc is arranged at the end of the telescopic rod, a plurality of groups of inclined blades distributed in a circumferential array are arranged on the cutter disc, and a plurality of groups of step strips distributed at intervals are arranged on the inclined outer surface of the blade.

[0007] Preferably, the guide assembly includes a guide bottom frame and a conveyor belt, the upper end of the guide bottom frame is opposite to the iron brush roller and the knife disc, one end of the conveyor belt is located at the lower end of the guide bottom frame, and the other end of the conveyor belt extends into the recovery frame.

[0008] Preferably, a vertically extending lifting groove is provided on the crossbeam, side columns that fit with the inner wall of the lifting groove are provided on both sides of the lifting seat, a lifting rod is provided at the lower end of the lifting groove, and the upper end of the lifting rod is connected to the lower end of the lifting seat.

[0009] Preferably, one end of the telescopic rod is rotatably inserted into the lifting seat through a bearing, the rotary motor is fixed on one side of the lifting seat, and the output shaft of the rotary motor is connected to one end of the telescopic rod, and the telescopic end of the telescopic rod is connected to the cutter disc.

[0010] Preferably, the blade is installed on the cutter disc at an inclination angle of 30-45 degrees, a reinforcement component is provided between the lower end inclined surface of the blade and the cutter disc, and a stepped clip is fixedly welded to the upper end inclined surface of the blade.

[0011] Preferably, rollers are provided at the lower ends of the front frame and the rear frame, and the lower end of the iron brush roller is located above the rollers.

[0012] Preferably, the reinforcing assembly includes a bottom plate, a vertical plate and side ribs, the bottom plate is attached to and fixed on the end face of the cutter disc, the vertical plate is supported between the bottom plate and the lower end inclined surface of the blade, and a plurality of groups of side ribs are arranged at intervals on both sides of the vertical plate.

[0013] A method for leveling a pile foundation pit side wall, the leveling method comprising the following steps:

[0014] Step 1: Determine the exact location of the piles at the construction site according to the drawings and mark them. Use existing excavators to dig the construction site to form a foundation pit. When the working surface of the foundation pit approaches the piles, reserve a thin soil layer of 5-10 cm;

[0015] Step 2: Replace the existing excavator equipment with the above-mentioned pile foundation pit side wall leveling excavation assembly, and use the rotation of the iron brush roller to clean the soil on the thin soil layer, so that the gravel and rock blocks in the soil layer are exposed, and the cleaning thickness is enough to see the arc-shaped outer wall of the pile column to form a cleaning surface;

[0016] Step 3: After the iron brush roller is cleaned, the gravel and rock blocks with one end exposed and the other end embedded in the soil layer of the construction site are cleaned. For the gravel and rock blocks with a small exposed volume, the rotation of the blade is used to cut and clean them. For the gravel and rock blocks with a large exposed volume, the telescopic rod is used to drive the step strips on the blades distributed in the circular array to clamp the exposed gravel and rock blocks, and twist them off with the rotation drive, leaving holes in the soil layer;

[0017] Step 4: After the cleaning is completed, due to height limitations, the lower end of the cleaned surface cannot be cleaned, forming a stepped layer. A baffle is installed on the stepped layer, and holes are drilled on the piles to install anchor rods. The other end of the anchor rod is connected to the baffle, leaving a gap between the baffle and the cleaned surface. Grouting is then performed to fill the gap and the holes caused by cleaning to form a post-cast layer, thus forming a flat foundation pit side wall on the stepped layer.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention realizes leveling and cleaning of the side wall of the pile foundation pit by arranging an excavation component, uses an iron brush roller to clean the soil on the reserved thin soil layer to expose the gravel and rock blocks, and uses the cutting or clamping and twisting of the knife skin to clean the embedded gravel and rock blocks, which will not cause the collapse of the side wall, and after cleaning, a stepped layer is formed at the bottom, which is convenient for the subsequent post-pouring of slurry to form a flat surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A top view of the excavation assembly of the present invention;

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the cutter head of the present invention installed on the lifting seat;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the cutter disc and the iron brush roller installed on the front arm frame of the present invention;

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the cutter head of the present invention;

[0024] Figure 5 A schematic diagram of a foundation pit cleaning by an excavation assembly of the present invention;

[0025] Figure 6 It is a schematic diagram of the foundation pit after the excavation assembly of the present invention is cleaned.

[0026] In the figure: 1. foundation pit; 2. construction site; 3. thin soil layer; 4. piles; 5. excavation assembly; 6. stepped layer; 7. post-casting layer; 51. front frame; 52. rear frame; 53. recovery frame; 8. conveyor belt; 9. roller; 10. crossbeam; 11. front arm frame; 12. iron brush roller; 13. driving motor; 14. rotating motor; 15. lifting seat; 16. lifting slot; 17. telescopic rod; 18. cutter head; 19. blade; 20. reinforcement assembly; 21. guide bottom frame; 22. side column; 23. lifting rod; 24. step card strip; 201. bottom plate; 202. vertical plate; 203. side rib. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figures 1 to 6 , the present invention provides a technical solution:

[0029] A pile foundation pit side wall leveling excavation component includes an excavation component 5, the excavation component 5 includes a front frame 51 and a rear frame 52 that can move laterally, rollers 9 are provided at the lower ends of the front frame 51 and the rear frame 52, a recovery frame 53 is connected between the front frame 51 and the rear frame 52, a pair of front arm frames 11 are provided at the front end of the front frame 51, and a guide component connected to the recovery frame 53 is provided at the lower end of the front arm frame 11, the guide component includes a guide bottom frame 21 and a conveyor belt 8, the upper end of the guide bottom frame 21 is opposite to the iron brush roller 12 and the cutter disc 18, one end of the conveyor belt 8 is located at the lower end of the guide bottom frame 21, and the other end of the conveyor belt 8 extends into the recovery frame 53.

[0030] By setting the roller 9, the lateral position movement and adjustment of the excavation component 5 can be achieved, and the guide bottom frame 21 is used to receive the soil, gravel and rocks that fall after cleaning, and the conveyor belt 8 is used to transport them to the recovery frame 53 to achieve continuous cleaning.

[0031] An iron brush roller 12 driven by a driving motor 13 is provided on the front arm frame 11 , and the lower end of the iron brush roller 12 is located above the roller 9 .

[0032] The rotation of the iron brush roller 12 is utilized to clean the soil on the side wall of the foundation pit and scrape it off. When encountering gravel and rock blocks, the soil on the surface can be cleaned to expose the gravel and rock blocks.

[0033] A cross beam 10 is arranged between a pair of forearm frames 11, a lifting seat 15 is installed on the cross beam 10 for lifting, a vertically extending lifting slot 16 is arranged on the cross beam 10, side columns 22 that are in contact with the inner wall of the lifting slot 16 are arranged on both sides of the lifting seat 15, a lifting rod 23 is arranged at the lower end of the lifting slot 16, and the upper end of the lifting rod 23 is connected to the lower end of the lifting seat 15.

[0034] By setting the cooperation between the lifting slot 16 and the lifting rod 23, the lifting and lowering adjustment of the lifting seat 15 is realized, thereby realizing the adaptive adjustment of the cleaning height of the foundation pit side wall.

[0035] A telescopic rod 17 driven by a rotating motor 14 is installed on the lifting seat 15, a cutter disc 18 is arranged at the end of the telescopic rod 17, and a plurality of groups of inclined blades 19 distributed in a circular array are arranged on the cutter disc 18. One end of the telescopic rod 17 is rotatably plugged into the lifting seat 15 through a bearing, the rotating motor 14 is fixed on one side of the lifting seat 15, and the output shaft of the rotating motor 14 is connected to one end of the telescopic rod 17, and the telescopic end of the telescopic rod 17 is connected to the cutter disc 18.

[0036] By setting the lifting seat 15, the telescopic rod 17 is rotatably installed, and then the rotating motor 14 is used to drive the telescopic rod 17 and the cutter head 18 to rotate, so as to achieve the purpose of rotary cutting. The telescopic drive of the telescopic rod 17 is used to clamp the crushed rock blocks, and then the rotation of the rotating motor 14 is coordinated to clamp the crushed rock blocks and twist them off.

[0037] The inclined outer surface of the blade 19 is provided with a plurality of stepped clips 24 distributed at intervals. The blade 19 is installed on the cutter disc 18 at an inclined angle of 30-45 degrees. A reinforcing assembly 20 is provided between the lower end inclined surface of the blade 19 and the cutter disc 18. The stepped clips 24 are fixedly welded to the upper end inclined surface of the blade 19. The reinforcing assembly 20 includes a bottom plate 201, a vertical plate 202 and side ribs 203. The bottom plate 201 is attached and fixed to the end surface of the cutter disc 18. The vertical plate 202 is supported between the bottom plate 201 and the lower end inclined surface of the blade 19. Multiple groups of side ribs 203 distributed at intervals are provided on both sides of the vertical plate 202.

[0038] By setting the blades 19 installed at an angle, multiple groups of blades 19 distributed in a circular array form a claw clamping shape to hold the exposed gravel and rock blocks. In conjunction with the limiting function of the step clamping strips 24, the friction force of the holding is increased to prevent self-rotation. At the same time, a reinforcing component 20 is set to improve the supporting strength of the blades 19 set at an angle.

[0039] Working principle: First, the iron brush roller 12 is rotated to clean the soil on the thin soil layer 3, so that the gravel and rocks in the soil layer are exposed, and the cleaned soil falls on the diversion bottom frame 21, and is transported to the recovery frame 53 by the conveyor belt 8 to achieve continuous cleaning.

[0040] Clean until the curved outer wall of the pile 4 can be seen, then stop the iron brush roller 12, and use the rotating motor 14 to drive the telescopic rod 17 and the cutter disc 18 to rotate for the exposed small gravel and rock blocks, and then under the rotating cutting of the blade 19, the exposed small gravel and rock blocks are cut and cleaned to form a cutting surface with the curved outer wall of the pile 4, and the part embedded in the soil is retained to avoid collapse of the side wall of the foundation pit caused by excessive cleaning.

[0041] For gravel and rock blocks with large exposed volume, the telescopic rod 17 is used to drive the cutter head 18 toward the exposed end of the gravel and rock block, so that the upper inclined surface of the blades 19 distributed in a circular array is pressed against the exposed end of the gravel and rock block, and the stepped clamping strip 24 is used to increase friction and limit the position to avoid relative sliding. Then, the driving motor 14 is used to drive the gravel and rock blocks to rotate and fall from the embedded soil layer, forming holes on the side wall of the foundation pit.

[0042] After the excavation and cleaning is completed, due to the height limit of the roller 9 and the recovery frame 53, a height section will remain at the bottom of the foundation pit and cannot be cleaned, forming a stepped layer 6, thereby facilitating the subsequent stable pouring construction.

[0043] A method for leveling the side wall of a pile foundation pit, the leveling method comprising the following steps:

[0044] Step 1: Determine the exact position of the pile 4 at the construction site 2 according to the drawing and mark it, use the existing excavator equipment to dig the construction site 2 to form a foundation pit 1, and when the working surface of the foundation pit 1 is close to the pile 4, reserve a thin soil layer 3 of 5-10 cm;

[0045] Step 2: Replace the existing excavator equipment with the pile foundation pit side wall leveling excavation assembly, and use the rotation of the iron brush roller 12 to clean the soil on the thin soil layer 3, so that the gravel and rock blocks in the soil layer are exposed, and the cleaning thickness is enough to see the arc-shaped outer wall of the pile column 4, forming a cleaning surface;

[0046] Step 3: After the iron brush roller 12 is cleaned, the gravel and rock blocks with one end exposed and the other end embedded in the soil layer of the construction site 2 are cleaned. For the gravel and rock blocks with a small exposed volume, the blade 19 is used to cut and clean them. For the gravel and rock blocks with a large exposed volume, the telescopic rod 17 is used to drive the step clamping strips 24 on the blades 19 distributed in a circular array to clamp the exposed gravel and rock blocks, and twist them off with the rotation drive, leaving holes in the soil layer;

[0047] Step 4: After the cleaning is completed, due to the height limitation, the lower end of the cleaned surface cannot be cleaned, forming a stepped layer 6. A baffle is installed on the stepped layer 6, and holes are drilled on the piles 4 to install anchor rods. The other end of the anchor rod is connected to the baffle, leaving a gap between the baffle and the cleaned surface, and then grouting is performed to fill the gap and the holes caused by cleaning to form a post-cast layer 7. In this way, a flat foundation pit side wall is formed on the stepped layer 6. The grouting material can be selected according to the height of the foundation pit or the construction requirements. For conditions with a small height and a dry construction environment, viscous mud can be selected; for a large height and the need to prevent landslides, concrete mud or direct high-pressure concrete mud injection filling can be selected.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pile foundation pit side wall leveling excavation assembly, comprising an excavation assembly (5), characterized in that: The excavation assembly (5) comprises a front frame (51) and a rear frame (52) which are movable laterally, a recovery frame (53) being connected between the front frame (51) and the rear frame (52), a pair of front arm frames (11) being provided at the front end of the front frame (51), a flow guide assembly connected to the recovery frame (53) being provided at the lower end of the front arm frames (11), an iron brush roller (12) driven by a driving motor (13) being provided on the front arm frames (11), and a pair of front arm frames (11) being provided between the front arm frames (11). A crossbeam (10) is arranged between the two ends of the cutter and the cutter. A lifting seat (15) is installed on the crossbeam (10) for lifting. A telescopic rod (17) driven by a rotating motor (14) is installed on the lifting seat (15). A cutter disc (18) is arranged at the end of the telescopic rod (17). A plurality of groups of inclined blades (19) distributed in a circumferential array are arranged on the cutter disc (18). A plurality of groups of stepped clips (24) distributed at intervals are arranged on the inclined outer surfaces of the blades (19).

2. A pile foundation pit side wall leveling and excavation assembly according to claim 1, characterized in that: The flow guide assembly comprises a flow guide bottom frame (21) and a conveyor belt (8), wherein the upper end of the flow guide bottom frame (21) faces the iron brush roller (12) and the knife disc (18), one end of the conveyor belt (8) is located at the lower end of the flow guide bottom frame (21), and the other end of the conveyor belt (8) extends into the recovery frame (53).

3. A pile foundation pit side wall leveling and excavation assembly according to claim 1, characterized in that: The cross beam (10) is provided with a vertically extending lifting groove (16), and side columns (22) that are in contact with the inner wall of the lifting groove (16) are provided on both sides of the lifting seat (15). A lifting rod (23) is provided at the lower end of the lifting groove (16), and the upper end of the lifting rod (23) is connected to the lower end of the lifting seat (15).

4. A pile foundation pit side wall leveling and excavation assembly according to claim 3, characterized in that: One end of the telescopic rod (17) is rotatably inserted into the lifting seat (15) through a bearing, the rotary motor (14) is fixed on one side of the lifting seat (15), and the output shaft of the rotary motor (14) is connected to one end of the telescopic rod (17), and the telescopic end of the telescopic rod (17) is connected to the cutter disc (18).

5. A pile foundation pit side wall leveling and excavation assembly according to claim 4, characterized in that: The blade (19) is installed on the cutter disc (18) at an inclination angle of 30-45 degrees, a reinforcing component (20) is arranged between the lower end inclined surface of the blade (19) and the cutter disc (18), and a stepped clamping strip (24) is fixedly welded to the upper end inclined surface of the blade (19).

6. A pile foundation pit side wall leveling and excavation assembly according to claim 1, characterized in that: Rollers (9) are arranged at the lower ends of the front frame (51) and the rear frame (52), and the lower end of the iron brush roller (12) is located above the roller (9).

7. A pile foundation pit side wall leveling and excavation assembly according to claim 5, characterized in that: The reinforcing assembly (20) comprises a bottom plate (201), a vertical plate (202) and side ribs (203); the bottom plate (201) is attached to and fixed on the end surface of the blade disc (18); the vertical plate (202) is supported between the bottom plate (201) and the lower end inclined surface of the blade (19); and a plurality of groups of side ribs (203) are arranged at intervals on both sides of the vertical plate (202).

8. A method for leveling the side wall of a pile foundation pit, characterized in that: The leveling method comprises the following steps: Step 1: Determine the exact position of the pile column (4) at the construction site (2) according to the drawings and mark it, use existing excavation equipment to dig the construction site (2) to form a foundation pit (1), and when the working surface of the foundation pit (1) is close to the pile column (4), reserve a thin soil layer (3) of 5-10 cm; Step 2: Replace the existing excavator equipment with the pile foundation pit side wall leveling and excavation assembly described in any one of claims 1 to 7, and use the rotation of the iron brush roller (12) to clean the soil on the thin soil layer (3) so that the gravel and rocks in the soil layer are exposed, and the cleaning thickness is enough to see the curved outer wall of the pile column (4), thereby forming a cleaning surface; Step 3: After the iron brush roller (12) has been cleaned, the gravel and rock blocks with one end exposed and the other end embedded in the soil layer of the construction site (2) are cleaned. For the gravel and rock blocks with a small exposed volume, the blade (19) is used to cut and clean them by rotating. For the gravel and rock blocks with a large exposed volume, the telescopic rod 17 is used to drive the step clamping strips (24) on the blades (19) distributed in a circular array to clamp the exposed gravel and rock blocks, and twist them off with the rotation drive, leaving holes in the soil layer. Step 4: After the cleaning is completed, due to height limitations, the lower end of the cleaned surface cannot be cleaned, forming a stepped layer (6). A baffle is installed on the stepped layer (6), and holes are drilled on the piles (4) to install anchor rods. The other end of the anchor rod is connected to the baffle, leaving a gap between the baffle and the cleaned surface. Grouting is then performed to fill the gap and the holes caused by cleaning to form a post-casting layer (7). In this way, a flat foundation pit side wall is formed on the stepped layer (6).

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