Convenient lattice type pile pulling device and construction method thereof

Abstract

A convenient lattice type pile pulling device comprises a steel square ground breaking module, a lattice column, a lattice column connecting unit and a lattice column extending frame which are sequentially connected from bottom to top, the lattice column extending frame is connected with a vibration head of a crawler crane, and the lower portion of the steel square ground breaking module is a square ground breaking head of a rectangular hollow structure. An inclined plate is arranged on the front face of the upper portion of the steel square ground breaking module to form a variable cross-section, the minimum position of the variable cross-section is connected with the latticed column, and the minimum cross-section of the variable cross-section is the same as the cross-section of the latticed column. Inclined sliding grooves are formed in the left side face and the right side face of the square ground breaking head, the two inclined sliding grooves are sleeved with the steel bottom-carrying pile pulling sliding bolt in an up-down sliding mode, the highest positions of the inclined sliding grooves are close to the front face of the square ground breaking head, namely the maximum section position of the inclined plate, and the lowest positions of the inclined sliding grooves are located in the middle of the square ground breaking head. The invention further provides a construction method of the convenient lattice type pile pulling device. The construction method is simple and convenient, the construction speed is high, the cost is low, and the influence on the environment is small.

Description

Technical Field

[0001] The present invention belongs to the technical field of foundation treatment for building construction, and in particular relates to a convenient lattice-type pile pulling device and a construction method thereof. Background Art

[0002] With the recent demand for demolition and reconstruction of old buildings due to aging functions and urban planning renewal, the demand for demolition of old buildings has been increasing. In order to adapt to the structural layout of new projects, the existing underground pile foundations need to be efficiently removed.

[0003] Traditional construction methods include hydraulic jacking, impact pile extraction, and full-rotation drilling rig pile extraction. For example, hydraulic jacking involves static pile extraction, equipped with a hydraulic jack and reaction frame. This method requires a strong foundation bearing capacity, has high site requirements, and is slow to extract piles. The impact pile extraction method uses a high-frequency vibratory hammer to transmit vibration energy to the pile, breaking the friction between the pile and the soil, loosening the pile, and then extracting it. This method is generally only suitable for sandy soil or loose formations. The high vibration during pile extraction may affect surrounding buildings or pipelines. The full-rotation drilling rig cutting method uses a full-rotation drilling rig to clamp the pile, cutting the soil around the pile while rotating, and extracting the pile simultaneously. This method is highly accurate and produces minimal disturbance, but its disadvantages are complex construction equipment and high equipment costs. All of the above methods for removing abandoned piles have certain limitations and place high demands on the construction environment, machinery, and technology, which can increase pile extraction time or construction costs. Summary of the Invention

[0004] In order to overcome the shortcomings of existing pile extraction methods, such as poor versatility, high requirements on construction environment, machinery and equipment and technology, long construction period and high cost, the present invention provides a convenient lattice pile extraction device and a construction method thereof, which has a simple construction method, fast construction speed, low cost and little impact on the environment.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A convenient lattice-type pile pulling device comprises a steel square earth-breaking module, a lattice column, a lattice column connecting unit and a lattice column extension frame connected in sequence from bottom to top, the lattice column extension frame is connected to the vibrating head of the crawler crane, the lower part of the steel square earth-breaking module is a square earth-breaking head with a rectangular hollow structure, an inclined plate is provided on the upper front of the steel square earth-breaking module to form a variable cross-section, the minimum point of the variable cross-section is connected to the lattice column, and the minimum cross-section of the variable cross-section is the same as the cross-section of the lattice column; oblique slide grooves are provided on the left and right sides of the square earth-breaking head, and a steel bottom pile pulling bolt can be slid up and down on the two oblique slide grooves, the highest point of the oblique slide groove is close to the front of the square earth-breaking head, that is, the maximum cross-section of the inclined plate, and the lowest point of the oblique slide groove is located in the middle of the square earth-breaking head.

[0007] In the present invention, the inclined plate makes the cross-sectional dimensions of the square earth-breaking head and the lattice column different. The steel bottom-supporting pile-pulling sliding bolt at the variable cross-sectional area provides space to avoid the waste pile body during the sinking process. At the same time, the inclined plate provides a sliding inclined surface for the soil in the steel square earth-breaking module when the device sinks, so as to reduce the resistance to sinking.

[0008] Furthermore, the oblique sliding groove is provided with an arc-shaped sliding bolt clamping groove, and the arc-shaped sliding bolt clamping groove is adapted to the steel bottom-supporting pile-pulling sliding bolt.

[0009] Furthermore, the steel bottom-supporting pile-pulling sliding bolt includes a sliding bolt body, a circular limit head, a pull ring seat and a steel circular pull ring. There are circular limit heads at both ends of the sliding bolt body, and a trapezoidal pull ring seat with a hole outside the circular limit head. A steel circular pull ring is set on the pull ring seat.

[0010] Preferably, the steel square earth-breaking module is formed by fixedly connecting rectangular hollow steel sections and steel plates.

[0011] The lattice column is a hollow column, which is connected by four lattice column angle steels and multiple lattice column plates. The lower part of the lattice column is fixedly connected to the upper part of the steel square earth-breaking module, and the upper part of the lattice column is fixedly connected to the lattice column connection unit.

[0012] The lattice column connection unit includes a connection socket, a sleeve and a connection plug. The upper part of the lattice column is fixedly connected to the connection socket, the connection socket is fixedly connected to the sleeve, the sleeve is fixedly connected to the connection plug, and the connection plug is fixedly connected to the lattice column extension frame.

[0013] The connection socket is wrapped around the outer side of the upper angle steel of the lattice column and is formed by welding a plurality of steel plates. The connection socket is fixedly connected to the lattice column angle steel.

[0014] The connecting sleeve is a rectangular hollow steel, which is wrapped around the outside of the connecting plug and fixedly connected to the connecting plug. A circular bolt hole is opened on the connecting sleeve, which is fixedly connected to the connecting plug by bolts.

[0015] The connecting plug is welded from multiple steel plates. The lower part of the connecting plug is inserted into the connecting sleeve. A circular bolt hole is opened on the lower part of the connecting plug. The lower part of the connecting plug is connected to the connecting sleeve by bolts; the upper part of the connecting plug is fixedly connected to the lower part of the lattice column extension frame.

[0016] The lower part of the lattice column extension frame is a lattice column, and the upper part of the lattice column extension frame is composed of a connecting socket and a connecting sleeve, and the connecting sleeve is connected to the vibration head of the crawler crane.

[0017] A construction method of a convenient lattice pile pulling device comprises the following steps:

[0018] Step 1: Construction preparation: the crawler crane and the vibrating head are connected to the convenient lattice pile pulling device;

[0019] Step 2: Pile head positioning: Locate the old pile foundation that needs to be removed, and use an excavator to dig out the pile head at the location of the old pile foundation;

[0020] Step 3: Vibration sinking: Use a crawler crane to lift the vibrating head, clamp the convenient lattice pile pulling device with the vibrating head clamping mouth and lift it up, so that the steel square earth-breaking module covers the pile head of the waste pile; then start the vibrating head, and under the action of high-frequency vibration, the entire device sinks as a whole. When the steel bottom pile pulling sliding bolt touches the top of the waste pile, it will slide upward along the slide groove to avoid the waste pile body;

[0021] Sink until it reaches the predetermined pile bottom elevation, which is the set reserved depth below the pile bottom;

[0022] Step 4: Vibrate and lift together with the precast piles as follows:

[0023] The vibration mode of the vibrating head is activated, and the convenient lattice pile pulling device and the waste pile are lifted at a constant speed; when the convenient lattice pile pulling device and the waste pile bottom are lifted away from the soil surface, the lifting is completed, and the vibration mode of the vibrating head is turned off;

[0024] Step 5: Slide the steel bottom pile pulling bolt upward to unlock the prefabricated pile. The waste pile in the lattice column is no longer locked at the pile bottom by the steel bottom pile pulling bolt and is released from the convenient lattice pile pulling device.

[0025] Step 6: The lattice column is lifted and separated from the precast pile, and the pile extraction is completed.

[0026] Furthermore, in step 3, during the vibration sinking period, if the soil layer is relatively dry, the friction between the convenient lattice pile pulling device and the soil layer is relatively large, affecting the pile pulling efficiency. Water injection measures are adopted to increase the lubricity of the soil surface, so that the convenient lattice pile pulling device can sink faster.

[0027] In step 4, after sinking to the predetermined pile bottom elevation, in order to ensure that the steel bottom support pile pulling sliding bolt slides down to the notch of the sliding bolt slot and is locked, a trial lifting process is carried out. During the trial lifting process, if only the device is lifted but the waste piles in the lattice column cannot be lifted together, it is necessary to continue vibrating and sinking for a distance and then try lifting again until the steel bottom support pile pulling sliding bolt can drive the waste piles to be lifted together, and the trial lifting is completed;

[0028] In step 5, the crawler crane hook is manually connected to the two ends of the pull ring of the steel bottom pile pulling sliding bolt with a chain lock; the crawler crane winch is started, the hook is lifted, and the chain lock pulls the pull ring to slide the steel bottom pile pulling sliding bolt upward along the slide groove.

[0029] The technical concept of the present invention is: when in use, the crawler crane vibration head is used to clamp the top of the present invention. When the present invention is vibrated and pressurized, the lattice column and the bottom steel square earth-breaking module sink together. During the sinking process, the steel square earth-breaking module can cut and separate the waste pile from the surrounding soil. After the entire steel square earth-breaking module and the steel bottom pile-pulling sliding bolt sink to the bottom of the waste pile, the lattice column is pulled upward. At this time, the soil inside the steel square earth-breaking module is disconnected and separated to form a cavity. The steel bottom pile-pulling sliding bolt follows the slide groove to the lower sliding bolt slot to clamp the waste pile bottom, thereby removing the waste pile at one time.

[0030] The beneficial effects of the present invention are mainly manifested in:

[0031] 1. The present invention can cut and separate the soil around the waste pile from the waste pile when the steel square earth-breaking module sinks into the soil layer. The lattice column surrounds the waste pile inside, greatly reducing the friction resistance of the pile body during pile extraction, further improving the speed of waste pile extraction.

[0032] 2. The principle of the pile extraction tool of the present invention differs from other pile extraction tools that clamp and remove the waste pile when it sinks into the soil. Instead, the steel bottom pile extraction bolt clamps the waste pile at its base, allowing the entire pile to be removed at once. The main load-bearing component during pile extraction is the present invention, so the waste pile does not bear the pullout force, preventing the pile from breaking during the extraction process and requiring a second extraction. This significantly improves the efficiency and success rate of pile extraction.

[0033] 3. The present invention is provided with a lattice column connection unit, which can connect multiple lattice column extension frames to change the structural dimensions of the present invention. Therefore, the present invention can adapt to waste piles of different lengths. In addition, the steel bottom-supporting pile-pulling sliding bolt of the present invention can move freely in the sliding groove and can adapt to waste piles of different diameters. Therefore, the present invention has good applicability and convenience.

[0034] 4. The present invention has a simple structure. Its main materials are steel sections, angle steels and steel plates. The main connection methods between the components are welding and bolt connections. It can be customized according to waste piles of different pile diameters and pile types, and is easy to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a construction diagram of a convenient lattice pile pulling device.

[0036] Figure 2 It is a full perspective view of a convenient lattice-type pile pulling device.

[0037] Figure 3 It is a three-dimensional diagram of a steel square earth-breaking module in a convenient lattice pile pulling device.

[0038] Figure 4This is another convenient lattice pile extraction device in the steel square earth-breaking module stereogram, that is Figure 3 Back view of .

[0039] Figure 5 It is a cross-sectional view of a steel square earth-breaking module in a convenient lattice pile extraction device.

[0040] Figure 6 This is a three-dimensional diagram of a steel bottom-supported pile pulling bolt in a convenient lattice-type pile pulling device.

[0041] Figure 7 It is a plan view of the lattice columns in a convenient lattice pile pulling device.

[0042] Figure 8 It is a three-dimensional diagram of the lattice column connection unit in a convenient lattice pile pulling device.

[0043] Figure 9 It is an exploded perspective view of the lattice column connection unit in a convenient lattice pile pulling device.

[0044] Figure 10 It is a cross-sectional view of a lattice column connection unit in a convenient lattice pile extraction device.

[0045] Figure 11 It is a three-dimensional diagram of a lattice column extension frame in a convenient lattice pile pulling device.

[0046] Figure 12 It is a flow chart of a convenient lattice pile extraction method.

[0047] The numbers in the figure are: 1-steel square earth-breaking module; 11-square earth-breaking head; 12-inclined plate; 13-inclined slide; 131-slide bolt slot; 2-steel bottom pile pulling slide bolt; 21-slide bolt; 22-limiting head; 23-pull ring seat; 24-pull ring; 3-lattice column; 31-lattice column angle steel; 32-lattice column plate; 4-lattice column connection unit; 41-connecting sleeve; 42-connecting socket; 43-connecting plug; 431-bolt hole; 44-bolt; 5-lattice column extension frame, 6-vibrating head, 7-crawler crane. DETAILED DESCRIPTION

[0048] The present invention will be further described below with reference to the accompanying drawings.

[0049] Reference Figures 1 to 11, a convenient lattice pile pulling device, comprising a steel square earth-breaking module 1, a lattice column 3, a lattice column connecting unit 4 and a lattice column extension frame 5 connected in sequence from bottom to top, the lattice column extension frame 5 is connected to the vibrating head 6 of the crawler crane 7, the lower part of the steel square earth-breaking module 1 is a square earth-breaking head 11 with a rectangular hollow structure, an inclined plate 12 is provided on the upper front of the steel square earth-breaking module 1 to form a variable cross-section, the minimum point of the variable cross-section is connected to the lattice column 3, and the minimum cross-section of the variable cross-section is the same as the cross-section of the lattice column 3; oblique slide grooves 13 are provided on the left and right sides of the square earth-breaking head 1, and the steel bottom pile pulling bolt 2 can be slidably mounted on the two oblique slide grooves 13 up and down, and the highest point of the oblique slide groove 13 is close to the front of the square earth-breaking head 1, that is, the maximum cross-section of the inclined plate 12, and the lowest point of the oblique slide groove 13 is located in the middle of the square earth-breaking head 1.

[0050] In the present invention, the inclined plate 12 makes the cross-sectional dimensions of the square earth-breaking head 11 and the lattice column 3 different. The cross-sectional area is where the steel bottom pile-pulling sliding bolt 2 is provided with space to avoid the waste pile body during the sinking process. At the same time, the inclined plate 12 provides a sliding inclined surface for the soil in the steel square earth-breaking module 1 when the device sinks, so as to reduce the resistance to sinking.

[0051] Furthermore, the oblique chute 13 has an arc-shaped slide bolt clamping groove 131, which is adapted to the steel bottom-supporting pile-pulling slide bolt 2. The arc-shaped slide bolt clamping groove 131 can be provided at the bottom or middle of the oblique chute.

[0052] Furthermore, the steel bottom-supporting pile-pulling sliding bolt 2 includes a sliding bolt body 21, a circular limiting head 22, a pull ring seat 23 and a steel circular pull ring 24. The sliding bolt body 21 has circular limiting heads 22 at both ends, and the circular limiting heads 22 have a trapezoidal pull ring seat 23 with a hole outside, and a steel circular pull ring 24 is provided on the pull ring seat 23.

[0053] Preferably, the steel square earth-breaking module 1 is formed by fixing rectangular hollow steel and steel plates.

[0054] The lattice column 3 is a hollow column, which is connected by four lattice column angle steels 31 and multiple lattice column plates 32. The lower part of the lattice column 3 is fixedly connected to the upper part of the steel square earth-breaking module 1, and the upper part of the lattice column 3 is fixedly connected to the lattice column connection unit 4.

[0055] The lattice column connection unit 4 includes a connection socket 42, a sleeve 41 and a connection plug 43. The upper part of the lattice column 3 is fixedly connected to the connection socket 42, the connection socket 42 is fixedly connected to the sleeve 41, the sleeve 41 is fixedly connected to the connection plug 43, and the connection plug 43 is fixedly connected to the lattice column extension frame 5.

[0056] The connecting socket 42 is wrapped around the outer side of the upper angle steel of the lattice column and is welded from multiple steel plates. The connecting socket is fixedly connected to the lattice column angle steel.

[0057] The connecting sleeve 41 is a rectangular hollow steel, which is wrapped around the outside of the connecting plug and fixedly connected to the connecting plug. A circular bolt hole is opened on the connecting sleeve, and the connecting sleeve is fixedly connected to the connecting plug by bolts.

[0058] The connecting plug 43 is welded from multiple steel plates. The lower portion of the connecting plug is inserted into the connecting sleeve. A circular bolt hole 431 is provided on the lower portion of the connecting plug. The lower portion of the connecting plug 43 is connected to the connecting sleeve 41 by bolts 44. The upper portion of the connecting plug 43 is fixedly connected to the lower portion of the lattice column extension frame 5.

[0059] The lower part of the lattice column extension frame 5 is a lattice column, and the upper part of the lattice column extension frame is composed of a connecting socket and a connecting sleeve, and the connecting sleeve is connected to the vibration head of the crawler crane.

[0060] When using the present invention to remove waste piles, the waste piles must first be accurately measured and positioned, and the heads of the waste piles must be dug out using an excavator to ensure that the present invention is correctly aligned with the waste piles. A crawler crane 7 (crawler crane) with a vibrating head 6 is then used to clamp the connecting sleeve of the lattice column extension frame 5. After the device is lifted vertically, the steel square earth-breaking module 1 is placed on the outside of the waste pile to be removed. At this time, the vibrating head 6 is used to vibrate downward and apply pressure, so that the steel square earth-breaking module 1 is inserted into the soil layer, and the soil around the waste pile is gradually cut off by the steel square earth-breaking module 1. When the steel square earth-breaking module 1 enters the soil layer, the steel bottom pile-pulling slide bolt 2 moves upward along the inclined chute 13 due to the upward squeezing and friction between the waste pile body and the soil, and reaches the lower space of the inclined plate 12 (the variable cross-section) to avoid the pile body. With further vibration and pressure, the square steel breaking module 1, the steel bottom-supporting pile-pulling bolt 2, and the lattice column 3 are completely pressed into the ground. After the square steel breaking module 1 reaches the bottom of the waste pile, it should be further lowered to about 1 meter below the pile bottom. The 1-meter overpressure depth provides space and time for the steel bottom-supporting pile-pulling bolt 2 to move downward along the chute 13 when the device is subsequently pulled upward. During this entire downward pressure process, the square steel breaking module 1 completely cuts and separates the soil around the waste pile, while the lattice column 3 completely encloses the waste pile, greatly reducing the friction between the pile and the soil during pile extraction and increasing the speed of waste pile removal.

[0061] Then, the lattice column 3 and the steel square earth-breaking module 1 are pulled up while vibrating. At this time, the soil inside the steel square earth-breaking module 1 is broken and separated due to the external vibration and the viscosity of the soil itself, forming a cavity in the steel square earth-breaking module 1. At this time, there is no soil blocking the lower part of the steel bottom-covering pile-pulling sliding bolt 2. At the same time, the soil outside the steel square earth-breaking module 1 will rub the pull ring seat 23 and the pull ring 24 exposed outside, so that the steel bottom-covering pile-pulling sliding bolt 2 follows the slide groove 13 to reach the lower sliding bolt clamping groove 131 to clamp the waste pile at the bottom, thereby removing the waste pile at one time.

[0062] After the waste pile is completely pulled out of the ground, a steel wire rope is tied to the pull ring 24, and the steel wire rope is pulled upward by an external crane to drive the entire steel bottom pile pulling slider 2 to move upward. When the steel bottom pile pulling slider 2 is completely removed from the pile bottom, it no longer provides support for the waste pile. At this time, the waste pile falls out of the device, and the entire pile pulling process is completed.

[0063] Reference Figure 12 A construction method of a convenient lattice pile pulling device comprises the following steps:

[0064] Step 1: Construction preparation, as follows:

[0065] Before construction, the "three connections and one leveling" should be achieved, surrounding obstacles should be cleared, and machinery, equipment and tools should be prepared;

[0066] Be familiar with the drawings of pile foundations for old building projects, determine the scope of pile removal, customize the device according to the length of the piles to be removed, formulate a construction plan based on construction requirements, combined with site conditions, equipment conditions, etc., determine the equipment route and pile removal sequence;

[0067] After the crawler crane, vibrating head, hydraulic power station and this device are connected to each other, they should be debugged and inspected to ensure the normal and safe operation of the equipment;

[0068] Step 2: Position the pile head as follows:

[0069] Use a locator to locate the old pile foundation that needs to be removed, and use an excavator to dig out the pile head at the location of the old pile foundation;

[0070] Step 3: Vibrate and sink, as follows:

[0071] Use crawler crane 7 to lift the vibrating head 6, start the hydraulic power station, clamp the vibrating head clamp and lift the device, so that the steel square earth-breaking module covers the waste pile head;

[0072] Start the vibrating head 6, and under the action of high-frequency vibration, the device will sink as a whole. When the steel bottom pile-pulling slide bolt touches the top of the waste pile, it will slide upward along the slide groove to avoid the waste pile body.

[0073] During the vibration sinking period, because the soil layer is relatively dry, the friction between the device and the soil layer is large, which affects the efficiency of pile extraction. Water injection measures are adopted to increase the lubricity of the soil surface, so that the device can sink faster;

[0074] The pile bottom elevation is set as the reserved depth below the pile bottom. The pile bottom elevation is generally about 1 meter below the pile bottom. The 1 meter depth provides space and time for the steel bottom pile pulling bolt 2 to move downward along the slide 13 when the device is subsequently pulled out.

[0075] Step 4: After sinking into place, conduct a trial lift. After the trial lift is completed, vibrate and lift together with the precast piles as follows:

[0076] After sinking to the predetermined elevation, a trial lifting process is required to ensure that the steel bottom support pile pulling slide bolt slides down to the notch of the slide bolt slot and is locked.

[0077] During the trial lifting process, if only the device is lifted and the waste piles in the lattice column cannot be lifted together, it is necessary to continue vibrating and sinking for a distance and then try lifting again until the steel bottom pile pulling sliding bolt can drive the waste piles to be lifted together, and the trial lifting is completed;

[0078] After the trial lifting is completed, start the vibration mode of the vibrating hammer and lift the device and the waste pile at a uniform speed; wait until the bottom of the device and the waste pile are lifted off the soil surface, the lifting is completed, and turn off the vibration mode of the vibrating head;

[0079] Step 4: Slide the slide bolt upward to unlock the precast pile, as follows:

[0080] After the device and the waste pile are lifted, the crawler crane hook is manually connected to the two ends of the pull ring with a chain lock; the crawler crane winch is started, the hook is lifted, and the chain lock pulls the pull ring to slide the steel bottom pile pulling sliding bolt upward along the slide groove; after the steel bottom pile pulling sliding bolt slides to the upper end of the slide groove, the waste pile in the lattice column is separated from the device because the sliding bolt is no longer locked to the pile bottom.

[0081] Step 5: Lift the lattice column and detach it from the precast piles as follows:

[0082] The vibrating head clamps the lattice column and lifts it upward at a uniform speed. The lattice column is lifted until the precast pile is completely out of the lattice column, and the pile extraction is completed.

[0083] The construction method of this embodiment utilizes a device consisting of a square steel groundbreaking module and steel pile-pulling bolts at the bottom, a lattice column in the middle, a lattice column connecting unit, and a lattice column extension frame at the top to encase the precast pile. Under the vibration pressure of a vibrating hammer, the square steel groundbreaking module sinks and cuts, separating the waste pile from the surrounding soil. The vibrating hammer then rapidly extracts the device and the precast pile together. If the soil is dry during construction, the friction between the lattice column and the soil is high, affecting pile extraction efficiency. Water injection is used to lubricate the soil surface to reduce friction and speed up construction.

[0084] The embodiments of this specification are merely examples of implementations of the invention and are provided for illustrative purposes only. The scope of protection of the present invention should not be considered limited to the specific embodiments described in these embodiments. The scope of protection of the present invention also extends to equivalent technical means that can be conceived by a person of ordinary skill in the art based on the invention.

Claims

1. A convenient lattice pile pulling device, characterized in that: The device includes a steel square earth-breaking module, a lattice column, a lattice column connecting unit and a lattice column extension frame which are connected in sequence from bottom to top. The lattice column extension frame is connected to the vibrating head of the crawler crane. The lower part of the steel square earth-breaking module is a square earth-breaking head with a rectangular hollow structure. An inclined plate is arranged on the upper front of the steel square earth-breaking module to form a variable cross-section. The minimum point of the variable cross-section is connected to the lattice column. The minimum cross-section of the variable cross-section is the same as the cross-section of the lattice column. The left and right sides of the square earth-breaking head are provided with inclined slide grooves. The steel bottom-covering pile-pulling sliding bolt can be slidably mounted on the two inclined slide grooves up and down. The highest point of the inclined slide groove is close to the front of the square earth-breaking head, that is, the maximum cross-section of the inclined plate. The lowest point of the inclined slide groove is located in the middle of the square earth-breaking head.

2. A convenient lattice pile pulling device as claimed in claim 1, characterized in that: The oblique sliding groove is provided with an arc-shaped sliding bolt clamping groove, and the arc-shaped sliding bolt clamping groove is adapted to the steel bottom-covering pile-pulling sliding bolt.

3. A convenient lattice pile pulling device as claimed in claim 1 or 2, characterized in that: The steel bottom-protecting pile-pulling sliding bolt comprises a sliding bolt body, a circular limiting head, a pull ring seat and a steel circular pull ring. The sliding bolt body has circular limiting heads at both ends, and a trapezoidal pull ring seat with holes is arranged outside the circular limiting heads. The steel circular pull ring is arranged on the pull ring seat.

4. A convenient lattice pile pulling device as claimed in claim 1 or 2, characterized in that: The steel square earth-breaking module is formed by fixedly connecting rectangular hollow steel sections and steel plates.

5. A convenient lattice pile pulling device as claimed in claim 1 or 2, characterized in that: The lattice column is a hollow column, formed by connecting four lattice column angle steels and multiple lattice column plates. The lower part of the lattice column is fixedly connected to the upper part of the steel square earth-breaking module, and the upper part of the lattice column is fixedly connected to the lattice column connecting unit.

6. A convenient lattice pile pulling device as claimed in claim 1 or 2, characterized in that: The lattice column connection unit comprises a connection socket, a sleeve and a connection plug, the upper part of the lattice column is fixedly connected to the connection socket, the connection socket is fixedly connected to the sleeve, the sleeve is fixedly connected to the connection plug, and the connection plug is fixedly connected to the lattice column extension frame; The connection socket is wrapped around the outer side of the upper angle steel of the lattice column and is welded from a plurality of steel plates. The connection socket is fixedly connected to the lattice column angle steel; The connecting sleeve is a rectangular hollow steel, which is wrapped around the outside of the connecting plug and fixedly connected to the connecting plug. A circular bolt hole is opened on the connecting sleeve, which is fixedly connected to the connecting plug by bolts; The connecting plug is welded from multiple steel plates. The lower part of the connecting plug is inserted into the connecting sleeve. A circular bolt hole is opened on the lower part of the connecting plug. The lower part of the connecting plug is connected to the connecting sleeve by bolts. The upper part of the connecting plug is fixedly connected to the lower part of the lattice column extension frame.

7. A construction method of the convenient lattice pile pulling device according to claim 1, characterized in that: The construction method comprises the following steps: Step 1, construction preparation: the crawler crane and the vibrating head are connected to the convenient lattice pile pulling device; Step 2: Pile head positioning: locate the old pile foundation that needs to be removed, and use an excavator to dig out the pile head at the location of the old pile foundation; Step 3, vibration sinking: use a crawler crane to lift the vibration head, use the vibration head clamp to clamp the convenient lattice pile pulling device and lift it, so that the steel square earth-breaking module covers the pile head of the waste pile; then start the vibration head, and under the action of high-frequency vibration, the whole device sinks as a whole, and the steel bottom pile pulling sliding bolt will slide upward along the slide groove to avoid the waste pile body when it touches the top of the waste pile; The pile sinks until it reaches the predetermined pile bottom elevation, which is the set reserved depth below the pile bottom; Step 4: Vibrate and lift together with the precast piles, as follows: The vibration mode of the vibration head is started, and the convenient lattice pile pulling device and the waste pile are lifted at a uniform speed; when the convenient lattice pile pulling device and the waste pile bottom are lifted to be separated from the soil surface, the lifting is completed, and the vibration mode of the vibration head is turned off; Step 5: Slide the steel bottom pile pulling sliding bolt upward to unlock the prefabricated pile, and the waste pile in the lattice column is separated from the convenient lattice pile pulling device because the steel bottom pile pulling sliding bolt no longer locks the pile bottom; Step 6: The lattice column is lifted and separated from the precast pile, and the pile extraction is completed.

8. The construction method according to claim 7, characterized in that: In step 3, during the vibration sinking, if the soil layer is relatively dry, the friction between the convenient lattice pile pulling device and the soil layer is relatively large, which affects the pile pulling efficiency. Water injection measures are adopted to increase the lubricity of the soil surface so that the convenient lattice pile pulling device can sink faster.

9. The construction method according to claim 7 or 8, characterized in that: In step 4, after sinking to the predetermined pile bottom elevation, in order to ensure that the steel bottom-covering pile-pulling sliding bolt slides down to the notch of the sliding bolt slot and is locked, a trial lifting process is carried out. During the trial lifting process, if only the present device is lifted but fails to drive the waste piles in the lattice column to be lifted together, it is necessary to continue to vibrate and sink for a distance and then try to lift again until the steel bottom-covering pile-pulling sliding bolt can drive the waste piles to be lifted together, and the trial lifting is completed.

10. The construction method according to claim 7 or 8, characterized in that: In step 5, the crawler crane hook is manually connected to the two ends of the pull ring of the steel bottom pile pulling sliding bolt with a chain lock; the crawler crane winch is started, the hook is lifted, and the chain lock pulls the pull ring to slide the steel bottom pile pulling sliding bolt upward along the slide groove.

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