Construction method of hydraulic pile cutting

Abstract

This invention discloses a hydraulic pile cutting construction method, including plane positioning, determining pile cutting parameters, judging whether i is greater than N, and if not, proceeding according to height h. i The process involves cutting the pile head and separating it from the hydraulic pile cutting device. If necessary, the pile head is cut at the final cutting position, the level of the cutting mechanism is adjusted before cutting, and the pile head is then lifted and separated. This construction method allows for segmented pile head cutting and automatically adjusts the height of the cutting mechanism each time before cutting. During the Nth cutting, the level of the cutting structure is adjusted before cutting, ensuring a level surface after the pile head is cut, reducing the difficulty of subsequent processing. After cutting, the bottom of the pile head remains supported on the cutting rod of the hydraulic cutting device, and the pile head support frame supports the side of the cut pile head to prevent it from tipping over. Compared to traditional pile head processing techniques, this construction method improves the accuracy of horizontal pile head cutting, reduces manual labor, lowers construction safety risks, and increases mechanization.

Description

Technical Field

[0001] This invention relates to a hydraulic pile cutting construction method, belonging to the field of pile foundation construction technology. Background Technology

[0002] Cast-in-place concrete piles are widely used in foundation engineering for hydraulic structures, industrial buildings, civil buildings, and bridges, and are also commonly used for slope and foundation pit support. To ensure the quality of the cast-in-place pile foundation and its effective connection with the superstructure, it is usually required that the piles be over-poured to a certain height during construction. Before constructing the superstructure, the pile head needs to be chiseled or cut off; the pile head is the over-poured concrete portion of the pile foundation. The traditional pile head treatment process involves manually chiseling it off with hand-held pneumatic picks and then using a crane to remove it. This method has many disadvantages, including high labor and machinery costs, significant construction safety risks, and low levels of mechanization.

[0003] Currently, simple hydraulic pile cutting devices have appeared on the market, which use cranes in conjunction with hydraulic pile cutting devices to cut piles. However, the use of large-tonnage cranes is usually costly, and it is difficult to guarantee the cutting height and levelness of the hydraulic pile cutting device, resulting in deviations in the pile head cutting position and tilting of the pile cutting section. This still requires further manual operation of tools, and does not solve the problems of high labor and machine input costs, high construction safety risks, and low level of mechanization in the traditional process. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention provides a hydraulic pile cutting construction method. Using this pile cutting machine for pile cutting and pile head lifting can improve the accuracy of horizontal pile head cutting, reduce manual labor input, lower construction safety risks, and improve the level of mechanization.

[0005] To solve the above technical problems, the present invention includes the following technical solutions:

[0006] A hydraulic pile cutting construction method employs a hydraulic pile cutting machine, which includes a traveling mechanism, a boom mechanism, an adjustment mechanism, a pile cutting mechanism, a pump station, and a hydraulic control center. The traveling mechanism is used for movement. One end of the boom mechanism is mounted on the traveling mechanism, and the other end is equipped with an adjustment mechanism. The adjustment mechanism includes several lifting hydraulic cylinders, a pile head support frame, and a level. The top of each lifting hydraulic cylinder is connected to the end of the boom mechanism, and the bottom telescopic end is hinged to the pile head support frame. The pile head support frame can be fitted onto the pile head, and a level is mounted on the pile head support frame. The instrument; the pile cutting mechanism includes a pile cutting hydraulic cylinder and a pile cutting steel rod. Connecting steel plates are provided on both sides of the pile cutting hydraulic cylinder. Multiple pile cutting hydraulic cylinders are spliced ​​together in sequence through the connecting steel plates to form a closed loop. One end of the pile cutting steel rod is a pointed tip, and the other end is fixedly connected to the telescopic end of the pile cutting hydraulic cylinder. The extension and retraction operations of the pile cutting hydraulic cylinder can drive the pile cutting steel rod to move along the central axis. The pump station and hydraulic control center are set on the traveling mechanism or the boom mechanism to control the extension or retraction operation of each lifting hydraulic cylinder individually, and can synchronously control the extension or retraction operation of all pile cutting hydraulic cylinders.

[0007] The construction method includes the following steps:

[0008] Step 1, Planar Positioning: The traveling mechanism drives the entire pile cutter to move directly above the pre-cut pile position, so that the center of the pile cutter coincides with the center of the pre-cut pile position;

[0009] Step 2: Determine the pile cutting parameters: The pile cutting parameters include the number of pile cuttings N and the height of each pile cutting h. i N is a natural number, i = 1, 2, 3, ..., N-1, N; initially assigned the value i = 1;

[0010] Step 3: Determine if i ≥ N? If yes, proceed to step 8; otherwise, proceed to step 4.

[0011] Step 4: Adjust the height to h i By controlling the extension and retraction of the lifting hydraulic cylinder, the height of the pile cutting mechanism is adjusted to the predetermined height h. i ;

[0012] Step 5: Cut off the pile head: Simultaneously control the extension operation of the hydraulic cylinder for cutting the pile, push the cutting steel rod to symmetrically squeeze the pile concrete, and achieve the cutting off of the pile head;

[0013] Step Six: Pile Head Lifting and Separation: By controlling all lifting hydraulic cylinders to retract synchronously upwards, the severed pile head is lifted and separated from the original pile body or reinforcing steel.

[0014] Step 7: Let i = i + 1, and proceed to step 3;

[0015] Step 8: Adjust the height of the pile cutting mechanism to H0; by controlling the extension and retraction of the lifting hydraulic cylinder, adjust the height of the pile cutting mechanism to the predetermined height H0;

[0016] Step 9: Adjust the levelness of the pile-cutting mechanism;

[0017] Step 10, Cut off the pile head: Simultaneously control the extension operation of the hydraulic cylinder for cutting the pile head, push the cutting steel rod to symmetrically squeeze the pile concrete, and achieve the cutting off of the pile head;

[0018] Step 11, Pile Head Lifting and Separation: By controlling all lifting hydraulic cylinders to retract synchronously upwards, the severed pile head is lifted and separated from the original pile body.

[0019] Furthermore, in step two, determining the pile cutting parameters specifically involves: determining the maximum single pile cutting height Δh based on the performance of the pile cutting machine; measuring the actual height H of the pre-cut pile top; determining the design height H0 of the pre-cut pile top; calculating the pile cutting height difference ΔH = H - H0; and determining the number of pile cutting operations N by (N-1) × Δh < ΔH ≤ N × Δh; the pile cutting height h for each operation is... i =h i-1 -Δh, where h0=H, h N =H0.

[0020] Furthermore, in step eight, the height of the pile cutting mechanism is adjusted to H0. Specifically, all lifting hydraulic cylinders are initially adjusted to a height difference of less than 1 cm above and below H0. Then, one of the lifting hydraulic cylinders is precisely adjusted to H0. Then, in conjunction with the observation level, the other lifting hydraulic cylinder is adjusted to make the level horizontal, thereby making the pile head support frame and the pile cutting mechanism horizontal.

[0021] Furthermore, the hydraulic pile cutter includes three lifting hydraulic cylinders;

[0022] The pile head support frame is a metal ring. Ear plates are provided at the three equal division points of the metal ring. Ear plates are provided at the telescopic end of the lifting hydraulic cylinder. Ear plates are provided with pin holes and are connected by pin shafts.

[0023] Furthermore, the pile head support frame includes a regular hexagonal ring structure, on which three cylinder seats are set at equal angles. Each cylinder seat is equipped with a supporting hydraulic cylinder. The supporting hydraulic cylinder is set horizontally and its extension end points towards the center of the pile head support frame. An arc-shaped clamp is set on the extension end, and a rubber pad is set on the inner side of the arc-shaped clamp.

[0024] During the pile cutting process and the hoisting, separation, and transportation of the pile head, the supporting hydraulic cylinder is in the extended state, and the arc-shaped clamping plate clamps and holds the upper part of the pile head tightly.

[0025] Furthermore, a limiting cylinder is provided on the connecting steel plate, and the pile-cutting hydraulic cylinder is located in the limiting cylinder with both ends extending out of the limiting cylinder. A notch running through the length direction is provided on the side wall of the limiting cylinder, and a positioning tooth groove is provided on the side wall of the pile-cutting hydraulic cylinder, with the positioning tooth groove located in the notch. A drive motor is also provided on the connecting steel plate, and a drive gear is provided on the shaft of the drive motor. The drive gear meshes with the positioning tooth groove, and the drive motor can drive the drive gear to rotate, so that the positioning tooth groove drives the pile-cutting hydraulic cylinder to move along the center line direction in the limiting cylinder.

[0026] When the pile cutting radius of the pile cutting mechanism needs to be adjusted, the drive motor can drive the drive gear to rotate, causing the positioning tooth groove to move in a straight line, which in turn drives the pile cutting hydraulic cylinder to move along the length of the limit cylinder, thereby adjusting the position of the pile cutting hydraulic cylinder and adjusting the pile cutting radius to the required size.

[0027] Furthermore, a first limiting ring and a second limiting ring are also provided at intervals on the pile cutting hydraulic cylinder to limit the movement range of the pile cutting hydraulic cylinder in the limiting cylinder. The first limiting ring is located at the tail of the pile cutting hydraulic cylinder and restricts the maximum forward movement of the pile cutting hydraulic cylinder. The second limiting ring is located at the front of the pile cutting hydraulic cylinder and restricts the maximum backward movement of the pile cutting hydraulic cylinder. The positioning tooth groove is located between the first limiting ring and the second limiting ring.

[0028] Furthermore, the boom mechanism includes two vertical support steel frames and a horizontal support steel frame; the two vertical support steel frames are fixedly connected to both sides of the traveling mechanism, and the horizontal support steel frame connects the two vertical support steel frames into one unit. The support structure can provide an installation position for the pump station and hydraulic control center; one end of the horizontal support steel frame extends forward, and the lifting hydraulic cylinder is installed at the cantilever end of the horizontal support steel frame.

[0029] The present invention, by adopting the above technical solution, has the following advantages and positive effects compared with the prior art: The hydraulic pile cutting construction method provided by the present invention can travel to directly above the pre-cut pile position via a walking mechanism, and can achieve this by setting the number of pile cuttings N and the pile cutting height h each time. iThis invention enables segmented pile head cutting and automatically adjusts the height of the cutting mechanism for each cut. During the Nth cut, the cutting mechanism is positioned at the designed height H0 of the pre-cut pile top. The levelness of the cutting structure is then adjusted before cutting, ensuring a level surface after the pile head is cut, reducing the difficulty of subsequent processing. After cutting, the bottom of the pile head remains supported on the cutting rod of the hydraulic cutting device. A pile head support frame supports the side of the cut pile head to prevent it from tipping over. By simultaneously controlling the upward retraction of the hydraulic cylinders of multiple vertical hydraulic lifting devices, the cut pile head is lifted and separated from the original pile body and reinforcing steel. Compared to traditional pile head processing methods, the hydraulic pile cutting method provided by this invention improves the accuracy of horizontal pile head cutting, reduces manual labor, lowers construction safety risks, and increases mechanization. Attached Figure Description

[0030] Figure 1 This is a flowchart of a hydraulic pile cutting construction method according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of a hydraulic pile cutter according to one embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the adjustment mechanism and the pile-cutting mechanism in one embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the pile head support frame in one embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the pile cutting unit in one embodiment of the present invention;

[0035] Figure 6 for Figure 4 Sectional view along the middle AA.

[0036] The numbers in the diagram are as follows:

[0037] 10- Walking mechanism;

[0038] 20 - Boom mechanism; 21 - Vertical support steel frame; 22 - Horizontal support steel frame;

[0039] 30-Adjusting mechanism; 31-Lifting hydraulic cylinder; 32-Pile head support frame; 321-Ring structure; 322-Cylinder seat; 323-Supporting hydraulic cylinder; 324-Arc-shaped clamp; 325-Rubber pad; 23-Level instrument; 33-Level instrument;

[0040] 40-Pile cutting mechanism; 41-Pile cutting hydraulic cylinder; 42-Pile cutting steel rod; 43-Connecting steel plate; 44-Limiting cylinder; 45-Positioning tooth groove; 46-Drive motor; 47-Drive gear; 48-First limiting ring; 49-Second limiting ring;

[0041] 50 - Pump station and hydraulic control center. Detailed Implementation

[0042] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a more detailed explanation of the hydraulic pile cutting construction method provided by the present invention. The advantages and features of the present invention will become clearer from the following description. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0043] This embodiment provides a construction method for hydraulic pile cutting, combined with Figure 2 and Figure 3 As shown, the hydraulic pile cutter includes a traveling mechanism 10, a boom mechanism 20, an adjusting mechanism 30, a pile cutting mechanism 40, a pump station, and a hydraulic control center 50. The traveling mechanism 10 can be a tracked or roller-type traveling mechanism, enabling the pile cutter to travel. One end of the boom mechanism 20 is mounted on the traveling mechanism 10, and the other end is equipped with an adjusting mechanism 30. The adjusting mechanism 30 includes several lifting hydraulic cylinders 31, a pile head support frame 32, and a level 33. The top of the lifting hydraulic cylinders 31 is connected to the cantilever end of the boom mechanism 20, and the bottom telescopic end is hinged to the pile head support frame 32. The pile head support frame 32 can be fitted onto the pile head above the pile cutting position. The pile head support frame is equipped with a level 33 to adjust the levelness of the pile head support frame. The pile cutting mechanism 40 includes a pile cutting hydraulic cylinder 41 and a pile cutting steel rod 42. Connecting steel plates 43 are correspondingly arranged on both sides of the pile cutting hydraulic cylinder 41. Multiple pile cutting hydraulic cylinders 41 are sequentially spliced ​​together through the connecting steel plates 43 to form a closed loop. One end of the pile cutting steel rod 42 is a pointed tip, and the other end is fixedly connected to the telescopic end of the pile cutting hydraulic cylinder 41. The extension and retraction operations of the pile cutting hydraulic cylinder 41 can drive the pile cutting steel rod 42 to move along the central axis. The pump station and hydraulic control center 50 are set on the traveling mechanism 10 or the boom mechanism, including a set of pump stations, multiple oil pipes, and a control system. The control system can control each oil pipe individually. Each lifting hydraulic cylinder 31 is connected to an independent oil pipe, and all pile cutting hydraulic cylinders 41 are connected to one oil pipe. The pump station and hydraulic control center 50 can individually control the extension or retraction of each lifting hydraulic cylinder 31, thereby adjusting the height and flatness of the pile head support frame and the pile cutting mechanism, and can also realize the synchronous extension or retraction of all pile cutting hydraulic cylinders 41, thereby achieving pile head cutting.

[0044] Combination Figures 1 to 3As shown, the construction method includes the following steps:

[0045] Step 1, Planar Positioning: The traveling mechanism 10 moves the entire pile cutter to directly above the pre-cut pile position, so that the center of the pile cutter 40 coincides with the center of the pre-cut pile position.

[0046] Step 2: Determine the pile cutting parameters: The pile cutting parameters include the number of pile cuttings N and the height of each pile cutting h. i N is a natural number, i = 1, 2, 3, ..., N-1, N. Specifically, the maximum single pile cutting height Δh is determined based on the performance of the pile cutter; the actual height H of the pre-cut pile top is measured; the design height H0 of the pre-cut pile top is determined according to the design drawings; the pile cutting height difference ΔH = H - H0 is calculated; and the number of pile cutting operations N is determined by (N-1) × Δh < ΔH ≤ N × Δh. The pile cutting height h for each operation... i =h i-1 -Δh, where h0=H, h N =H0, initially assigned the value i=1.

[0047] Step 3: Determine if i ≥ N? If yes, proceed to step 8; otherwise, proceed to step 4.

[0048] Step 4: Adjust the height to h i By controlling the extension and retraction of the lifting hydraulic cylinder 31, the height of the pile cutting mechanism 40 is adjusted to the predetermined height h. i The extension and retraction accuracy of the hydraulic cylinder can reach the millimeter level, enabling high-precision adjustment of the pile cutting mechanism's height up to 40 degrees.

[0049] Step 5: Cut off the pile head: 40 sets of pile cutting mechanisms are installed at the pile head to be cut off at a height of h. i The hydraulic cylinder 41 for cutting the pile is extended synchronously. The circumferentially arranged hydraulic cylinder 41 pushes the cutting steel rod 42 to symmetrically squeeze the pile concrete, which eventually causes the pile concrete to crack and penetrate in the radial direction to form a plane, thus achieving the cutting off of the pile head.

[0050] Step Six: Pile Head Lifting and Separation: After the pile head is cut off, its bottom remains supported on the cutting steel rod 42 of the pile cutting mechanism 40. The pile head support frame 32 supports the side of the cut pile head to prevent it from tipping over. By controlling the three lifting hydraulic cylinders 31 to retract synchronously upwards, the cut pile head is lifted and separated from the original pile body or reinforcing steel.

[0051] Step 7: Let i = i + 1, and then proceed to step 3.

[0052] Step 8: Adjust the height of the pile cutting mechanism 40 to H0. By controlling the extension and retraction of the lifting hydraulic cylinder 31, adjust the height of the pile cutting mechanism 40 to the predetermined height H0.

[0053] Step 9: Adjust the level of the pile cutting mechanism 40. Adjust the level of the pile head support frame 32 by observing the level instrument 33. Since the pile cutting mechanism 40 is parallel to the pile head support frame 32, when the pile head support frame 32 is level, the pile cutting mechanism 40 is also level.

[0054] Step 10, Cutting off the pile head: The pile cutting mechanism 40 is set at the predetermined height position of the pre-cut pile head, and the pile cutting hydraulic cylinder 41 is simultaneously controlled to extend. The circumferentially arranged pile cutting hydraulic cylinder 41 pushes the pile cutting steel rod 42 to symmetrically squeeze the pile concrete, which finally causes the pile concrete to crack radially and penetrate to form a plane, thus achieving the cutting off of the pile head.

[0055] Step 11: Pile Head Lifting and Separation: After the pile head is cut off, its bottom remains supported on the cutting steel rod 42 of the pile cutting mechanism 40. The pile head support frame 32 supports the side of the cut pile head to prevent it from tipping over. By controlling the three lifting hydraulic cylinders 31 to retract synchronously upwards, the cut pile head is lifted and separated from the original pile body or reinforcing steel. This completes the construction.

[0056] In one specific embodiment, the walking mechanism 10 can be a tracked walking mechanism, including two sets of tracks (left and right), a hydraulic motor, a reducer, several rollers, and a support structure. This tracked walking mechanism enables the hydraulic pile cutter to move safely and adaptably across the construction site. The hydraulic motor is mounted on the support structure, and the rollers are mounted on the support structure via a central shaft. The hydraulic motor is connected to one or more rollers via the reducer. The tracks are fitted around the outer ring of the rollers and can roll synchronously with the rollers without slippage. The hydraulic motor drives the rollers to rotate, thereby causing the tracks to roll and achieving the walking function.

[0057] In one specific embodiment, the boom mechanism 20 includes two vertical support steel frames 21 and a horizontal support steel frame 22. The two vertical support steel frames 21 are fixedly connected to the left and right sides of the traveling mechanism, respectively. The horizontal support steel frame 22 connects the two vertical support steel frames 21 into one unit. The boom mechanism can provide an installation position for the pump station and hydraulic control center 50. One end of the horizontal support steel frame 22 extends forward, and the lifting hydraulic cylinder 31 is installed at the cantilever end of the horizontal support steel frame 22.

[0058] In one specific embodiment, combined with Figure 2 and Figure 3As shown, the pile head support frame 32 is a metal ring. Ear plates are located at the three equal division points of the metal ring, and ear plates are located at the telescopic ends of the lifting hydraulic cylinder 31. Ear plates one and two have pin holes and are connected by pins. A level 33 is installed at each of the three equal division points of the metal ring. In step eight, the three lifting hydraulic cylinders 31 are initially adjusted to near H0, for example, with a height difference within 1 cm. Then, one of the lifting hydraulic cylinders 31 is precisely adjusted to H0. Using the level 33 as a reference, the other two lifting hydraulic cylinders 31 are adjusted to make the level 33 horizontal, thus ensuring that the pile head support frame 32 and the pile cutting mechanism 40 are in a horizontal state.

[0059] In one specific embodiment, such as Figure 4 As shown, the pile head support frame 32 includes a regular hexagonal ring structure 321. Three cylinder seats 322 are spaced apart on the ring structure 321. Each cylinder seat 322 is equipped with a supporting hydraulic cylinder 323. The supporting hydraulic cylinder 323 is horizontally positioned with its extension end pointing towards the center of the pile head support frame 32. An arc-shaped clamping plate 324 is provided on the extension end. A rubber pad 325 is provided on the inner side of the arc-shaped clamping plate 324. By extending and retracting the supporting hydraulic cylinder 323, the arc-shaped clamping plate 324 can clamp and fix the upper part of the pile head, keeping the pile head stable during the pile cutting process. After the pile head is cut off, the bottom rests on the pile cutting steel rod 42, and the upper part is clamped and fixed by the arc-shaped clamping plate 324, which can keep the pile head stable during hoisting and transportation, improving the safety of pile cutting and pile head hoisting and transportation. Three supporting hydraulic cylinders 323 are connected to one oil pipe. Through the pump station and hydraulic control center 50, the cylinder retraction operation of the three supporting hydraulic cylinders can be controlled synchronously to achieve the clamping and fixing of the pile head.

[0060] In one specific embodiment, combined with Figures 2 to 6As shown, the pile cutting mechanism 40 includes a pile cutting hydraulic cylinder 41, a pile cutting steel rod 42, and a connecting steel plate 43. A limiting cylinder 44 is provided on the connecting steel plate 43. The pile cutting hydraulic cylinder 41 is disposed within the limiting cylinder 44, with both ends extending out of the limiting cylinder 44. A through notch is provided on the side wall of the limiting cylinder 44 along its length. A positioning groove 45 is provided on the side wall of the pile cutting hydraulic cylinder 41, and the positioning groove 45 is disposed within the notch. A drive motor 46 is also provided on the connecting steel plate 43. A drive gear 47 is provided on the shaft of the drive motor 46. The drive gear 47 meshes with the positioning groove 45. The drive motor 46 can drive the drive gear 47 to rotate, causing the positioning groove 45 to move within the notch along the length of the notch, thereby causing the pile cutting hydraulic cylinder 41 to move back and forth within the limiting cylinder 44. Furthermore, a first limiting ring 48 and a second limiting ring 49 are spaced apart on the pile-cutting hydraulic cylinder 41 to limit the movement range of the pile-cutting hydraulic cylinder 41 within the limiting cylinder 44. The first limiting ring 48 is located at the tail of the pile-cutting hydraulic cylinder 41, limiting the maximum forward movement of the pile-cutting hydraulic cylinder 41. The second limiting ring 49 is located at the front of the pile-cutting hydraulic cylinder 41, limiting the maximum backward movement of the pile-cutting hydraulic cylinder 41. The positioning groove 45 is located between the first limiting ring 48 and the second limiting ring 49. The pile-cutting mechanism 40 provided in this embodiment can drive the drive gear 47 to rotate via the drive motor 46, causing the positioning groove 45 to move linearly, thereby driving the pile-cutting hydraulic cylinder 41 to move along the length direction of the limiting cylinder 44. This adjusts the position of the pile-cutting hydraulic cylinder 41 and the range of the pile-cutting radius, allowing the pile-cutting mechanism 40 to adapt to a wider range of pile diameters, improving the versatility of the equipment, increasing construction efficiency, and reducing construction costs.

[0061] 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.

[0062] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A construction method for hydraulic pile cutting, characterized in that, A hydraulic pile cutter is used for construction. The hydraulic pile cutter includes a traveling mechanism, a boom mechanism, an adjusting mechanism, a pile cutting mechanism, a pump station, and a hydraulic control center. The traveling mechanism is used for movement. One end of the boom mechanism is mounted on the traveling mechanism, and the other end is equipped with an adjusting mechanism. The adjusting mechanism includes several lifting hydraulic cylinders, a pile head support frame, and a level. The top of the lifting hydraulic cylinders is connected to the end of the boom mechanism, and the bottom telescopic end is hinged to the pile head support frame. The pile head support frame can be fitted onto the pile head, and a level is mounted on the pile head support frame. The pile cutting mechanism... The mechanism includes a pile-cutting hydraulic cylinder and a pile-cutting steel rod. Connecting steel plates are installed on both sides of the pile-cutting hydraulic cylinder. Multiple pile-cutting hydraulic cylinders are spliced ​​together in sequence through the connecting steel plates to form a closed loop. One end of the pile-cutting steel rod is a pointed tip, and the other end is fixedly connected to the telescopic end of the pile-cutting hydraulic cylinder. The extension and retraction operations of the pile-cutting hydraulic cylinder can drive the pile-cutting steel rod to move along the central axis. The pump station and hydraulic control center are set on the traveling mechanism or the boom mechanism to control the extension or retraction operation of each lifting hydraulic cylinder individually, and can synchronously control the extension or retraction operation of all pile-cutting hydraulic cylinders. The construction method includes the following steps: Step 1, Planar Positioning: The traveling mechanism drives the entire pile cutter to move directly above the pre-cut pile position, so that the center of the pile cutter coincides with the center of the pre-cut pile position; Step 2: Determine the pile cutting parameters: The pile cutting parameters include the number of pile cuttings N and the height of each pile cutting h. i N is a natural number, i = 1, 2, 3, ..., N-1, N; initially assigned the value i = 1; Step 3: Determine if i ≥ N? If yes, proceed to step 8; otherwise, proceed to step 4. Step 4: Adjust the height to h i By controlling the extension and retraction of the lifting hydraulic cylinder, the height of the pile cutting mechanism is adjusted to the predetermined height h. i ; Step 5: Cut off the pile head: Simultaneously control the extension operation of the hydraulic cylinder for cutting the pile, push the cutting steel rod to symmetrically squeeze the pile concrete, and achieve the cutting off of the pile head; Step Six: Pile Head Lifting and Separation: By controlling all lifting hydraulic cylinders to retract synchronously upwards, the severed pile head is lifted and separated from the original pile body or reinforcing steel. Step 7: Let i = i + 1, and proceed to step 3; Step 8: Adjust the height of the pile cutting mechanism to H0; by controlling the extension and retraction of the lifting hydraulic cylinder, adjust the height of the pile cutting mechanism to the predetermined height H0; Step 9: Adjust the levelness of the pile-cutting mechanism; Step 10, Cut off the pile head: Simultaneously control the extension operation of the hydraulic cylinder for cutting the pile head, push the cutting steel rod to symmetrically squeeze the pile concrete, and achieve the cutting off of the pile head; Step 11, Pile Head Lifting and Separation: By controlling all lifting hydraulic cylinders to retract synchronously upwards, the severed pile head is lifted and separated from the original pile body.

2. The construction method for hydraulic pile cutting as described in claim 1, characterized in that, Step two involves determining the pile cutting parameters as follows: Based on the performance of the pile cutter, determine the maximum single pile cutting height Δh; measure the actual height H of the pile top to be cut; determine the design height H0 of the pile top to be cut; calculate the pile cutting height difference ΔH = H - H0; and determine the number of pile cutting operations N by (N-1) × Δh < ΔH ≤ N × Δh; the pile cutting height h for each operation... i =h i-1 -Δh, where h0=H, h N =H0.

3. The construction method for hydraulic pile cutting as described in claim 1, characterized in that, In step eight, the height of the pile cutting mechanism is adjusted to H0. Specifically, all the lifting hydraulic cylinders are initially adjusted to a height difference of less than 1 cm above and below H0. Then, one of the lifting hydraulic cylinders is precisely adjusted to H0. Then, in conjunction with the observation level, the other lifting hydraulic cylinder is adjusted to make the level horizontal, so that the pile head support frame and the pile cutting mechanism are in a horizontal state.

4. The construction method for hydraulic pile cutting as described in claim 1, characterized in that, The hydraulic pile cutter includes three lifting hydraulic cylinders; The pile head support frame is a metal ring. Ear plates are provided at the three equal division points of the metal ring. Ear plates are provided at the telescopic end of the lifting hydraulic cylinder. Ear plates are provided with pin holes and are connected by pin shafts.

5. The construction method for hydraulic pile cutting as described in claim 1, characterized in that, The pile head support frame includes a regular hexagonal ring structure. Three cylinder seats are set at equal angles on the ring structure. Each cylinder seat is equipped with a supporting hydraulic cylinder. The supporting hydraulic cylinder is set horizontally and its extension end points towards the center of the pile head support frame. An arc-shaped clamp is set on the extension end, and a rubber pad is set on the inner side of the arc-shaped clamp. During the pile cutting process and the hoisting, separation, and transportation of the pile head, the supporting hydraulic cylinder is in the extended state, and the arc-shaped clamping plate clamps and holds the upper part of the pile head tightly.

6. The construction method for hydraulic pile cutting as described in claim 1, characterized in that, A limiting cylinder is provided on the connecting steel plate, and the pile cutting hydraulic cylinder is set in the limiting cylinder with both ends extending out of the limiting cylinder. A notch is provided on the side wall of the limiting cylinder along the length direction, and a positioning tooth groove is provided on the side wall of the pile cutting hydraulic cylinder, which is set in the notch. A drive motor is also provided on the connecting steel plate, and a drive gear is provided on the shaft of the drive motor. The drive gear meshes with the positioning tooth groove, and the drive motor can drive the drive gear to rotate, so that the positioning tooth groove drives the pile cutting hydraulic cylinder to move along the center line direction in the limiting cylinder. When the pile cutting radius of the pile cutting mechanism needs to be adjusted, the drive motor can drive the drive gear to rotate, causing the positioning tooth groove to move in a straight line, which in turn drives the pile cutting hydraulic cylinder to move along the length of the limit cylinder, thereby adjusting the position of the pile cutting hydraulic cylinder and adjusting the pile cutting radius to the required size.

7. The construction method for hydraulic pile cutting as described in claim 6, characterized in that, The hydraulic cylinder for pile cutting is also provided with a first limiting ring and a second limiting ring at intervals to limit the range of movement of the hydraulic cylinder within the limiting cylinder. The first limiting ring is located at the tail of the hydraulic cylinder and limits the maximum forward movement of the hydraulic cylinder. The second limiting ring is located at the front of the hydraulic cylinder and limits the maximum backward movement of the hydraulic cylinder. The positioning tooth groove is located between the first limiting ring and the second limiting ring.

8. The construction method for hydraulic pile cutting as described in claim 1, characterized in that, The boom mechanism includes two vertical support steel frames and a horizontal support steel frame. The two vertical support steel frames are fixedly connected to both sides of the traveling mechanism. The horizontal support steel frame connects the two vertical support steel frames into one unit. The support structure can provide an installation position for the pump station and hydraulic control center. One end of the horizontal support steel frame extends forward, and the lifting hydraulic cylinder is installed at the cantilever end of the horizontal support steel frame.

Images