Pile breaking construction method

Abstract

The invention relates to a pile breaking construction method which comprises the following steps: construction preparation: excavating a foundation pit by adopting excavating equipment, exposing the upper part of a cast-in-place pile, and connecting a pile breaking execution mechanism with the excavating equipment; the pile breaking executing mechanism is adjusted to be in a first state, and the concrete at the top of the cast-in-place pile is cut off till steel bars are exposed; the pile breaking executing mechanism is adjusted to be in a second state, the concrete on the inner side and the outer side of the steel bar in the cast-in-place pile is cut off, and the cylindrical concrete in the steel bar area is reserved till the preset elevation is reached; the pile breaking executing mechanism is adjusted to be in a pulse vibration mode, and the cylindrical concrete surrounding the steel bars in the cast-in-place pile is broken; and slag removal and reinforcement bar straightening: removing residual crushed concrete, and straightening the main reinforcement bar. The pile breaking executing mechanism driven by the excavator is used for replacing traditional manual pneumatic pick pile breaking, and the effects of low cost, low labor intensity, low dust, high quality and high efficiency of breaking the pile head of the cast-in-place pile are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pile breaking, in particular to a pile breaking construction method. BACKGROUND

[0002] When pouring a cast-in-place pile, the top elevation of the cast-in-place pile should be 0.8-1.0 m higher than the design top elevation of the pile to ensure the strength of the pile head concrete, but the part of the pile head higher than the design top elevation of the pile must be chipped off in the subsequent construction process, and the work of chipping off this part of the pile head concrete is called “pile head breaking”.

[0003] The existing pile head breaking construction method is to chip off the pile head from top to bottom by manual work combined with a pneumatic pick or an electric pick, which has the problems of large work load, high labor intensity of workers, long construction period, high cost, poor quality and very low construction efficiency, and is difficult to meet the construction period requirement, and generates a large amount of dust to affect the health of workers and cause environmental pollution. SUMMARY

[0004] Therefore, it is necessary to provide a pile breaking construction method to overcome the defects mentioned in the background.

[0005] The pile breaking construction method comprises the following steps: S1, construction preparation: excavating a foundation pit by using an excavating equipment to expose the upper part of the cast-in-place pile, and connecting a pile breaking execution mechanism with the excavating equipment; S2, cutting off the top concrete: adjusting the pile breaking execution mechanism to a first state, cutting off the top concrete of the cast-in-place pile until the internal reinforcement is exposed; S3, cutting off the concrete on the two sides: adjusting the pile breaking execution mechanism to a second state, cutting off the concrete on the two sides of the internal reinforcement of the cast-in-place pile until a predetermined elevation; S4, breaking the cylindrical concrete: adjusting the pile breaking execution mechanism to a pulse vibration mode to break the cylindrical concrete around the internal reinforcement of the cast-in-place pile; S5, removing the broken concrete and straightening the reinforcement: removing the broken concrete on the top of the cast-in-place pile and straightening the main reinforcement.

[0006] As a preferred embodiment of the pile breaking construction method, in the step S1, the excavating equipment is an excavator, which is connected with the pile breaking execution mechanism after the bucket is removed, and is connected with the pile breaking execution mechanism through a connecting pipeline to be driven.

[0007] As a preferred embodiment of the pile breaking construction method, in the step S1, it further comprises drawing a line at the breaking predetermined elevation of the cast-in-place pile.

[0008] As a preferred embodiment of the pile breaking construction method, the breaking predetermined elevation is the design top elevation of the cast-in-place pile.

[0009] As a preferred method of the present application, in step S2, when the pile breaking execution mechanism is in the first state, the guide drill bit is in the non-working state, and the sliding block slides to the interval between the outer ring rotary excavator and the center rotary excavator.

[0010] As a preferred method of the present application, in step S2, when the pile breaking execution mechanism is in the first state, the guide drill bit is in the non-working state, and the sliding block slides to the interval between the outer ring rotary excavator and the center rotary excavator.

[0011] As a preferred method of the present application, in step S3, when the pile breaking execution mechanism is in the second state, the guide drill bit is in the working state, and the sliding block slides from the interval between the outer ring rotary excavator and the center rotary excavator to the inner side of the outer ring rotary excavator.

[0012] As a preferred method of the present application, the interval is directly above the internal reinforcement of the pile, and the ring width of the interval is greater than the diameter of the internal reinforcement of the pile.

[0013] As a preferred method of the present application, in step S4, when the cylindrical concrete around the internal reinforcement of the pile is broken, the internal reinforcement of the pile should be avoided to be damaged.

[0014] As a preferred method of the present application, in step S5, the top of the pile breaking execution mechanism is provided with a connecting driving mechanism, the driving mechanism includes a frame, a rotary driving device is arranged inside the frame, the rotary driving device is connected with the frame through a telescopic assembly and can move in the vertical direction, the output end of the driving mechanism is connected with the input end of the pile breaking execution mechanism, the fixed end is connected with the excavating equipment, and an electric control mechanism for regulating the rotary driving device and the telescopic assembly is further arranged in the frame.

[0015] The present application has the following advantages: The present application replaces the traditional manual pneumatic pick pile breaking with the pile breaking execution mechanism driven by the excavator, which can quickly break the pile head, and the pile breaking process is mostly completed by mechanical equipment, reducing the workload and labor intensity of workers, improving the safety of pile head construction, and causing less damage to the reinforcement compared to the traditional method of peeling off the reinforcement from the pile head one by one, effectively improving the pile head construction quality, shortening the pile head construction period, reducing dust, reducing environmental pollution, and achieving the effect of low cost, low labor intensity, low dust, high quality, and high efficiency in breaking the pile head of the cast-in-place pile. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Figure 1 The flowchart of the construction method of the embodiment of the present application is shown in the figure. Figure 2 The structure diagram of the pile breaking execution mechanism when removing the top concrete is shown in the figure. Figure 3 The structure diagram of the pile breaking execution mechanism when removing the top concrete is shown in the figure. Figure 4 The structure diagram of the pile breaking execution mechanism when removing the inner and outer concrete is shown in the figure. Figure 5 The structure diagram of the driving mechanism of the embodiment of the present application is shown in the figure. Figure 6 The structure diagram of the driving mechanism of the embodiment of the present application is shown in the figure. Figure 7 The structure diagram of the guiding protection device of the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0019] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0024] According to one aspect of this application, embodiments of this application provide a pile breaking construction method. This method is applicable to pile heads with exposed or non-exposed reinforcing bars. When used for pile heads with non-exposed reinforcing bars, please refer to... Figure 1 As shown, the method includes steps such as construction preparation, removing the top concrete, removing the inner and outer concrete, breaking the cylindrical concrete, cleaning debris, and straightening the reinforcing bars. Through the above steps, the concrete in the pile head is removed, exposing the internal reinforcing bars.

[0025] The construction preparation phase includes the following steps: Once the strength of the cast-in-place piles reaches the required specifications, the foundation pit is excavated using excavation equipment to expose the upper part of the cast-in-place piles and the pile heads. The bottom elevation of the foundation pit is not higher than the bottom elevation of the foundation cushion layer. After excavation, the pile breaking actuator is connected to the excavation equipment. Finally, a line is drawn at the predetermined breaking elevation of the cast-in-place pile to indicate the length that needs to be broken. The predetermined breaking elevation is the design top elevation of the cast-in-place pile.

[0026] In one embodiment, the excavation equipment may be an excavator to facilitate subsequent connection with the pile breaking actuator. When connecting with the pile breaking actuator, the bucket connected to the excavator boom is first removed, and then the pile breaking actuator is connected to the excavator boom and driven by connecting pipelines.

[0027] In one embodiment, the pile breaking actuator includes a central rotary drilling head, a guide drill bit, an outer ring rotary drilling head, and an outer cylinder. The guide drill bit is located at the axial center of the central rotary drilling head and can extend and retract along the axial direction of the central rotary drilling head. The outer ring rotary drilling head is sleeved on the outer periphery of the bottom of the central rotary drilling head, and the inner periphery of the outer ring rotary drilling head is spaced from the outer periphery of the central rotary drilling head. A slider is provided on the inner periphery of the outer ring rotary drilling head, and the slider can slide towards the central rotary drilling head. The outer cylinder is sleeved on the outer periphery of the central rotary drilling head, and the outer cylinder is used to make the central rotary drilling head and the outer ring rotary drilling head rotate coaxially.

[0028] In one embodiment, the pile breaking actuator is equipped with a drive mechanism for driving the central rotary drilling head, guide drill bit, and slider. The drive mechanism is connected to the excavator via pipeline to obtain a power source. The drive mechanism includes a frame, with a connecting shaft at the top of the frame for connecting the excavating equipment. A rotary drive device is installed inside the frame. The rotary drive device is a hydraulic cylinder, coaxially arranged with the frame. A telescopic component is installed on the side of the rotary drive device. The telescopic component is a hydraulic telescopic rod, with its fixed end connected to the frame and its telescopic end connected to the side of the rotary drive device via a connector. The telescopic component drives the rotary drive device to move vertically. The output end of the drive mechanism is connected to the input end of the pile breaking actuator. The hydraulic cylinder and hydraulic telescopic rod are connected by a pipeline connected to the hydraulic pipe of the excavating equipment. An electrical control mechanism for regulating the rotary drive device and the telescopic component is also installed inside the frame.

[0029] In one embodiment, a visual auxiliary positioning component is also included, which is disposed inside the outer cylinder 4000. The visual auxiliary positioning component includes a visual camera and a sensing component. After the pile breaking execution mechanism removes the top concrete and exposes the reinforcing steel, the sensing component determines the center point of the pile head by sensing the change in the grounding resistance value of the reinforcing steel. Multiple visual cameras capture images of the top of the pile head from multiple angles and stitch them together to form a real-time image. The center point is marked in the real-time image, guiding the wire drill bit 2000 to align with the center point and avoiding deviation and damage to the reinforcing steel during subsequent breaking.

[0030] The top concrete removal stage includes the following steps: maneuvering the boom of the excavator to position the pile-breaking actuator vertically, then rotating the excavator to move the pile-breaking actuator to the designated position on the cast-in-place pile, such as... Figure 2 and Figure 3 As shown, the pile breaking actuator is adjusted to the first state, and the rotary drive device is moved downward from the pile head along the telescopic component to remove the concrete at the top of the pile head that does not contain reinforcing bars until the reinforcing bars are exposed or close to the reinforcing bars.

[0031] In one embodiment, when the pile breaking actuator is in the first state, the guide drill bit is not extended along the length of the cast-in-place pile and is in an inactive state. The slider slides to the gap between the outer ring rotary drilling head and the center rotary drilling head, which serves to connect the outer ring rotary drilling head and the center rotary drilling head so that the pile head can be removed as a whole.

[0032] In one embodiment, when removing the concrete at the top of the cast-in-place pile, the telescopic mechanism drives the crushing actuator to move along the length of the cast-in-place pile in order to control the crushing progress of the crushing actuator.

[0033] The process of removing concrete from both the inside and outside of the reinforcing bars includes the following steps: like Figure 4 As shown, the pile breaking actuator is adjusted to the second state and moved downward from the pile head to remove the concrete on both sides of the reinforcing steel zone of the cast-in-place pile. The concrete containing the reinforcing steel forms a cylindrical structure until the bottom of the breaking actuator is removed to the predetermined elevation. Before removing the concrete on both sides of the reinforcing steel zone of the cast-in-place pile, the broken concrete should be removed and the center point should be located by visual auxiliary positioning components.

[0034] In one embodiment, when the pile breaking actuator is in the second state, the guide drill bit extends along the length of the cast-in-place pile and is in working condition, aligned with the center point. The slider slides from the gap between the outer ring rotary drilling head and the center rotary drilling head to the inner side of the outer ring rotary drilling head. The outer ring rotary drilling head and the center rotary drilling head are separated by an annular gap to remove the concrete without reinforcing bars on both sides of the reinforcing bar area. When a partial cylindrical structure is formed and the guide drill bit has not drilled into the unbreakable part of the pile head, the guide drill bit is retracted to put it in an inactive state to avoid the guide drill bit damaging the unbreakable part of the pile head and reducing the quality of the pile head. During the subsequent breaking process, the cylindrical structure constrains the pile breaking actuator to prevent it from deviating.

[0035] In one embodiment, the spacer is located directly above the reinforcing bars of the cast-in-place pile. The ring width of the spacer is greater than the diameter of the reinforcing bars inside the cast-in-place pile. In order to avoid damaging the reinforcing bars during the removal process, the ring width of the spacer can be increased by 5 cm based on the diameter of the reinforcing bars. During removal, the spacing between the reinforcing bars and the outer and inner rings of the ring spacer is the same to avoid damaging the reinforcing bars.

[0036] The crushing of cylindrical concrete includes the following steps: Adjust the pile breaking actuator to pulse vibration mode. At this time, the drive mechanism drives the central rotary drilling head to continuously rotate forward and backward. The excavation equipment drives the pile breaking actuator to swing. During the swing, it moves up and down to break the cylindrical concrete.

[0037] The slag removal and rebar straightening stage includes the following steps: Remove any remaining broken concrete and straighten the main reinforcement bars to facilitate their subsequent connection to the foundation.

[0038] In one embodiment, after the slag removal is completed, the elevation of the pile top should be re-measured to avoid excessive deviation.

[0039] When used for pile heads with exposed reinforcing bars, the difference lies in the fact that a guiding protection device also needs to be installed during the preparation stage, such as... Figure 7 As shown, the guiding protection device includes a guide ring and connecting plates. The inner diameter of the guide ring is not less than the outer diameter of the central rotary drilling head. The guide ring can extend into the pile breaking actuator along the gap between the outer cylinder and the central rotary drilling head. Multiple connecting plates are arranged around the outside of the guide ring, and multiple through holes are arranged at the bottom of the connecting plates. The through holes cooperate with the clamps to fix the guiding protection device to the reinforcing bars. The circumferential dimension of the guiding protection device should be smaller than the gap between the central rotary drilling head and the outer cylinder to ensure that the pile breaking actuator can move up and down reciprocally.

[0040] During installation, first straighten the exposed steel bars, then place the guide protection device above the pile head and between the ring steel bars. Select a suitable size clamp to fix the guide protection device to the exposed steel bars, ensuring that the guide protection device and the pile head are coaxially arranged. The guide protection device can protect the exposed steel bars and also play a guiding role to prevent the pile breaking actuator from deviating.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A pile breaking construction method, characterized in that, Includes the following steps: S1. Construction preparation: Excavate the foundation pit using excavation equipment to expose the upper part of the cast-in-place piles, and connect the pile breaking mechanism to the excavation equipment. S2. Remove top concrete: Adjust the pile breaking actuator to the first state and remove the top concrete of the cast-in-place pile until the reinforcing steel is exposed; S3. Remove the concrete on both sides of the reinforcing bars, adjust the pile breaking mechanism to the second state, remove the concrete on both sides of the reinforcing bars inside the cast-in-place pile, and retain the cylindrical concrete in the reinforcing bar area until the predetermined elevation is reached. S4. Breaking the cylindrical concrete in the reinforced concrete zone: Adjust the pile breaking actuator to pulse vibration mode to break the cylindrical concrete surrounding the internal reinforcing steel of the cast-in-place pile. S5. Slag Removal and Reinforcement Straightening: Remove broken concrete from the top of the cast-in-place pile and straighten the main reinforcement bars.

2. The pile breaking construction method according to claim 1, characterized in that, In step S1, the excavating equipment is an excavator. When connected to the pile breaking actuator, the bucket is removed and then connected to the pile breaking actuator. The excavator is also connected to the pile breaking actuator through a connecting pipeline and driven.

3. The pile breaking construction method according to claim 2, characterized in that, Step S1 also includes drawing a line at the predetermined elevation of the broken pile.

4. The pile breaking construction method according to claim 3, characterized in that, The predetermined elevation for crushing is the design top elevation of the cast-in-place pile.

5. The pile breaking construction method according to claim 1, characterized in that, In step S2, when the pile breaking actuator is in the first state, the guide drill bit is in an inactive state, and the slider slides to the interval between the outer ring rotary drilling head and the center rotary drilling head.

6. The pile breaking construction method according to claim 5, characterized in that, In step S2, when removing the concrete at the top of the cast-in-place pile, the excavation equipment drives the crushing actuator to move along the length of the cast-in-place pile.

7. The pile breaking construction method according to claim 1, characterized in that, In step S3, when the pile breaking actuator is in the second state, the guide drill bit is in the working state, and the slider slides from the gap between the outer ring rotary drilling head and the center rotary drilling head to the inner side of the outer ring rotary drilling head.

8. The pile breaking construction method according to claim 7, characterized in that, The interval is located directly above the internal reinforcing bars of the cast-in-place pile, and the circumference of the interval is greater than the diameter of the internal reinforcing bars of the cast-in-place pile.

9. The pile breaking construction method according to claim 1, characterized in that, In step S4, when breaking the cylindrical concrete surrounding the internal reinforcing bars of the cast-in-place pile, damage to the internal reinforcing bars should be avoided.

10. The pile breaking construction method according to claim 1, characterized in that, The pile breaking actuator is equipped with a drive mechanism at its top. The drive mechanism includes a frame, and a rotary drive device is installed inside the frame. The rotary drive device is connected to the frame through a telescopic component and can move in the vertical direction. The rotating end of the drive mechanism is connected to the input end of the pile breaking actuator, and its fixed end is connected to the excavation equipment. An electrical control mechanism for adjusting the rotary drive device and the telescopic component is also installed inside the frame.

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