Chucking mechanism drive device and pile extraction method

Abstract

The objective is for multiple locking claws to be able to stand up or fall down simultaneously and completely. [Solution] A chucking mechanism drive device 20 for driving the chucking mechanism of a pile extraction machine is provided, comprising a cylindrical casing 3, a hydraulic cylinder 7 provided in the casing, and a plurality of claws 1 (1a, 1b) that can be raised or lowered by the extension and retraction of the hydraulic cylinder. Because there is only one hydraulic cylinder, the multiple claws are not driven independently, and the multiple claws can be raised or lowered simultaneously and completely.

Description

[Technical Field]

[0001] The present invention relates to a chucking mechanism driving device for a pile extractor used for extracting existing piles buried underground when rebuilding an architectural structure, and to a pile extraction method. [Background Art]

[0002] In architectural structures such as buildings and condominiums, piles are buried underground to support the load of the structures. When rebuilding these architectural structures, it is necessary to remove the existing buried piles. Conventionally, to remove existing piles, the existing piles have been crushed and taken out, or pulled out with a wire for removal.

[0003] Patent Document 1 describes a configuration in which a plurality of locking claws for locking an existing pile are provided at the lower end of a casing, and a hydraulic cylinder for driving each locking claw is provided at the upper end of the outer wall of the casing for each of the locking claws. [Prior Art Literature] [Patent Literature]

[0004] Patent Document 1: Japanese Patent No. 7474999 [Summary of the Invention] [Problem to be Solved by the Invention]

[0005] However, with the device described in Patent Document 1, there are cases where the plurality of hydraulic cylinders do not expand and contract simultaneously, and in such cases, there has been a problem that some of the plurality of locking claws may not rise or fall properly.

[0006] An object of the present invention is to solve the above problems and enable a plurality of locking claws to rise or fall simultaneously and completely. [Means for Solving the Problem]

[0007] To solve the above problems, the present invention provides a chucking mechanism drive device for driving the chucking mechanism of a pile extraction machine, It is possible to excavate the soil and dig into the ground. A cylindrical casing, The casing Inside A hydraulic cylinder is installed there, A connecting rod is connected to the hydraulic cylinder, and its tip extends across the cross-section of the casing, with the tip of the rod protruding outside the casing. The outer cylindrical portion to which the tip of the connecting rod is connected, Due to the extension and retraction of the first hydraulic cylinder, As the aforementioned outer cylindrical portion moves up and down, Multiple claws that can stand up or fall over, The present invention provides a chucking mechanism drive device characterized by being equipped with

[0008] With this configuration, since there is only one hydraulic cylinder, the multiple claws are not driven independently, and the multiple claws can be raised or lowered simultaneously and completely.

[0009] A chucking mechanism drive device, wherein the plurality of claws are moved by the extension of the one hydraulic cylinder. Through the standing window Standing upright on the central side of the casing cross section and is supported at the lower end of the aforementioned upright window, By compressing, the multiple claws The tip points downwards The configuration may also involve the casing tilting toward the inner wall side.

[0010] This configuration prevents damage to the hydraulic cylinder during casing replacement or storage.

[0013] Furthermore, in order to solve the above problems, the present invention provides a pile extraction method for pulling out existing piles, The cylindrical casing is positioned around the existing pile. Excavate the soil and dig deeper into the ground. Casing embedding process, The casing Inside By driving a hydraulic cylinder installed there, A connecting rod, which crosses the cross-section of the casing and has its tip protruding outside the casing, drives the outer cylindrical portion toward the tip of the casing and is connected to the outer cylindrical portion. A claw erection step in which multiple claws are erected toward the center of the cross-section of the casing, The present invention provides a pile extraction method characterized by performing a casing extraction step, in which the casing is pulled out, thereby supporting and pulling out the existing pile with the plurality of claws.

[0014] With this configuration, by driving a plurality of claws by the extension of one hydraulic cylinder, the claws can be raised simultaneously and completely.

[0015] A pile pulling method, wherein before the casing embedding step, the casing Inside by means of said one hydraulic cylinder provided in A connecting rod, which crosses the cross-section of the casing and has its tip protruding outside the casing, drives the outer cylindrical portion in the opposite direction to the tip of the casing, and is connected to the outer cylindrical portion. said plurality of claws to said casing The tip points downwards the configuration may also be such that a claw folding step of folding the claws to the inner peripheral wall side is performed. [Effects of the Invention]

[0016] With the chucking mechanism driving device for a pile puller of the present invention, a plurality of locking claws can be completely raised or folded simultaneously. [Brief Description of the Drawings]

[0017] [Figure 1] It is a diagram illustrating a chucking mechanism driving unit of a pile puller in Embodiment 1 of the present invention. [Figure 2] It is a diagram illustrating the operation of claws of the chucking mechanism of a pile puller in Embodiment 1 of the present invention. [Figure 3] It is a diagram illustrating a preparation step of the pile pulling method in Embodiment 1 of the present invention. [Figure 4] It is a diagram illustrating the first half of the casing embedding step and the casing pulling step in Embodiment 1 of the present invention. [Figure 5] It is a diagram illustrating the second half of the casing pulling step in Embodiment 1 of the present invention. [Mode for Carrying Out the Invention] [Examples]

[0018] Embodiment 1 of the present invention will now be described. Figure 1 is a side view illustrating the chucking mechanism of the pile extraction machine in Embodiment 1 of the present invention ((a) is an external view, (b) is a cross-sectional view). Figure 2 is a diagram illustrating the operation of the claws of the chucking mechanism of the pile extraction machine in Embodiment 1 of the present invention. Figure 3 is a diagram illustrating the preparation process of the pile extraction method in Embodiment 1 of the present invention. Figure 4 is a diagram illustrating the first half of the casing embedding process and the casing extraction process in Embodiment 1 of the present invention. Figure 5 is a diagram illustrating the second half of the casing extraction process in Embodiment 1 of the present invention.

[0019] (Chucking mechanism drive device) Embodiment 1 of the present invention, as shown in Figure 3, involves extracting an existing pile P buried in the ground using a telescopic crawler-type pile extractor 10 that is caterpillar-movable and easy to assemble. This telescopic crawler-type pile extractor 10 is equipped with a cylindrical casing 3 made by joining together five cylindrical segmented casings. Each segmented casing is joined together with bolts.

[0020] In Example 1, the number of segmented casings was set to five, but this is not necessarily limited to this number, and can be changed as appropriate depending on the length of the existing piles, etc. For example, it may be four or fewer, or six or more.

[0021] Existing piles P buried underground have a diameter of approximately 150 mm to 650 mm and a length of 6 m to 22 m. Their materials include cement (PC piles), pine (pine piles), and steel pipes (steel pipe piles). The casing 3 is selected to match the diameter and length of the existing pile. Specifically, the inner diameter of the casing 3 is larger than the diameter of the existing pile P, and its length is longer than the length of the existing pile P.

[0022] In this invention, the direction D (-Z direction) shown in Figure 1 is defined as the tip direction D of the casing.

[0023] As shown in Figure 1, an outer cylindrical portion 4 is provided concentrically on the outer circumferential surface near the tip of the casing 3. The outer cylindrical portion 4 can be moved along the casing 3 by a hydraulic cylinder 7, which will be described later. Furthermore, a tip cylindrical portion 5 is fixed to the casing 3 at the very tip D of the casing 3, beyond the outer cylindrical portion 4. Claw support portions 6 are fixed to the outer circumferential wall of this tip cylindrical portion 5 at 180° intervals.

[0024] The outer cylindrical portion 4 has claw shaft support portions 12 (12a, 12b) at 180° intervals corresponding to the claw support portions 6 (6a, 6b), and one end of each claw 1 (1a, 1b) is pivotally supported by the claw shaft support portions 12 (12a, 12b) in a direction perpendicular to the tip direction D of the casing 3. The outer cylindrical portion 4 is connected to a hydraulic cylinder 7, and when this hydraulic cylinder 7 extends, the outer cylindrical portion 4 can be moved along the casing 3 in the tip direction D of the casing, and when the hydraulic cylinder 7 compresses, the outer cylindrical portion 4 can be moved in the opposite direction to the tip direction D of the casing. By moving the outer cylindrical portion 4 in the tip direction D of the casing 3, multiple claws 1 (1a, 1b) can be erected toward the center of the cross-section of the casing 3, and by moving the outer cylindrical portion 4 in the opposite direction to the tip direction D of the casing 3, multiple claws 1 (1a, 1b) can be collapsed toward the inner circumferential wall of the casing 3.

[0025] As shown in the cross-sectional view in Figure 1(b), the hydraulic cylinder 7 is located inside the upper part of the casing 3. This prevents damage to the hydraulic cylinder 7 during replacement or storage. Furthermore, multiple locking claws can be raised or lowered simultaneously and completely. The rod L of the hydraulic cylinder 7 is connected to a connecting rod 9 that crosses the cross-section of the casing 3, and is then connected to multiple rods 8 (8a, 8b) that drive the outer cylindrical part 4. When the hydraulic cylinder 7 extends and retracts, the rods 8 (8a, 8b) extend and retract, and the outer cylindrical part 4 moves up and down, causing the multiple claws 1 (1a, 1b) to be raised or lowered through the raising window 14 provided in the casing 3.

[0026] By using a single hydraulic cylinder 7 to raise or lower multiple claws 1 (1a, 1b), multiple locking claws can be raised or lowered simultaneously and completely. Furthermore, because the inside of the casing 3 is spacious, it is possible to install a large hydraulic cylinder, and the capacity of the hydraulic cylinder can be appropriately selected depending on the number of claws, etc.

[0027] At the lower end of the casing 3, there are openings 14 (14a, 14b) for the claws 1 (1a, 1b) to stand upright and for the claws to be able to fall over. The lower end T1 (the end in the direction D towards the casing tip) can support the surface F of the claws 1 (1a, 1b) on the D side towards the casing tip when the claws 1 (1a, 1b) are standing upright. This allows the claws 1 (1a, 1b) to firmly support heavy existing piles P.

[0028] Multiple drilling blades 11 are provided at the lowest end of the casing 3, allowing the casing 3 to be embedded in the ground by using these drilling blades 11 to excavate the soil and dig deeper into the ground.

[0029] The claws 1 (1a, 1b) are constructed primarily of iron, capable of withstanding the weight of the existing pile P being pulled out, and have dimensions that allow them to contact the existing pile P. In Example 1, the claws are approximately 200-300 mm long, 100 mm wide, and 50 mm thick.

[0030] In Example 1, the claws 1 (1a, 1b) were configured to tilt toward the inner circumferential wall, but more preferably they are configured to tilt outward from the inner circumferential wall. This reduces the effect of earth pressure during the casing embedding process described later.

[0031] In Example 1, the number of claws was set to two, but this is not necessarily limited to this, and can be changed as appropriate depending on the weight of the existing pile to be pulled out. For example, the number of claws may be three or more.

[0032] Furthermore, in Example 1, the tips of the claws 1 (1a, 1b) are formed in a rounded shape, but this is not necessarily limited to this and can be modified as appropriate. For example, the tips may be formed at an acute angle to enable the holding or crushing of existing piles P.

[0033] Furthermore, in Embodiment 1, one hydraulic cylinder 7 is provided inside the casing 3, but this is not necessarily limited to this configuration and can be modified as appropriate. For example, one hydraulic cylinder 7 may be provided on the outer wall of the casing 3.

[0034] (Pile extraction method) First, a preparation step is performed to prepare a cylindrical casing 3 with an outer cylindrical section 4 concentrically located near the tip. In this preparation step, a casing 3 is prepared by joining together multiple segmented casings, and the lowest segmented casing has multiple drilling blades 11. More specifically, as shown in Figure 3, a telescopic crawler type pile extractor 10 that can move on caterpillar tracks and is easy to assemble is prepared. This telescopic crawler type pile extractor 10 has a casing 3 made by joining together five segmented casings. Each segmented casing is joined together with bolts, and near the lower end of the lowest segmented casing there is an outer cylindrical section 4 that pivotally supports two claws 1 (1a, 1b), and there is also a tip cylindrical section 5 fixed to the tip side of the casing 3 from the outer cylindrical section 4, and a claw support section 6 fixed to this tip cylindrical section 5.

[0035] In Example 1, a telescopic crawler-type pile extractor was used, but this is not necessarily limited to this configuration and can be modified as appropriate. For example, a rough terrain crane-type pile extractor may be used. Also, the pile extractor does not necessarily have to be a caterpillar-type machine. Furthermore, although the number of segmented casings was set to five, this is not necessarily limited to this and can be changed as appropriate depending on the length of the existing pile, etc. For example, it may be four or fewer, or six or more.

[0036] Existing piles P are buried underground. These existing piles P have a diameter of approximately 150 mmφ to 650 mmφ and a length of 6 m to 22 m, and are made of materials such as cement (PC piles), pine (pine piles), or steel pipes (steel pipe piles). In this invention, as shown in Figure 3, the underground end of the existing pile P is defined as tip P1, and the end closer to the surface is defined as end P2.

[0037] Casing 3 is selected to match the diameter and length of the existing pile. That is, the inner diameter of casing 3 is larger than the diameter of the existing pile P, and the length is longer than the length of the existing pile P. The soil is excavated in advance so that the end P2 of the existing pile P closest to the ground surface is visible.

[0038] Next, a hydraulic cylinder 7 located inside the casing 3 is compressed to move the connecting rod 9 in the opposite direction to the casing tip direction D, thereby moving the rod 8 in the opposite direction to the casing tip direction D, moving the outer cylindrical portion 4 in the opposite direction to the casing tip direction D, and performing a claw lowering process in which the claws 1 (1a, 1b) pivotally supported on the outer peripheral wall of the outer cylindrical portion 4 are lowered toward the inner peripheral wall of the casing 3.

[0039] Next, a casing embedding process is performed in which the casing 3 is embedded in the ground deeper than the existing pile P so that it is positioned around the existing pile P. To explain in more detail, first, as shown in Figure 4(a), the casing 3 is positioned around the existing pile P, and then the soil is excavated with multiple excavation blades 11 while the casing 3 is rotated in the forward direction, so that the claws 1 (1a, 1b) are embedded deeper than the tip P1 of the existing pile P. At this time, the claws 1 (1a, 1b) are bent towards the inner circumferential wall of the casing 3, so there is less resistance from the soil and it can be embedded smoothly.

[0040] Next, the claw erection process is performed to extend the hydraulic cylinder 7 located inside the casing 3 and move the connecting rod 9 toward the casing tip direction D, thereby moving the rod 8 toward the casing tip direction D, moving the outer cylindrical portion 4 toward the casing tip direction D, and erecting the claws 1 (1a, 1b), one end of which is pivotally supported by the outer cylindrical portion 4, toward the center of the cross-section of the casing 3 through the erection window 14, while supporting the lower end surface F of the claws 1 (1a, 1b) with the lower end T1 of the erection window 14 (14a, 14b). As a result, the claws 1 (1a, 1b) can support the heavy existing pile P.

[0041] Then, the casing extraction process is performed to extract the existing pile P together with the casing 3 (see Figures 4(b) and 4(c)). In other words, when the casing 3 is extracted while the claws 1 (1a, 1b) are standing upright towards the center of the cross-section of the casing 3, the upright claws 1 (1a, 1b) support the existing pile P, and the lower end surfaces F of the claws 1 (1a, 1b) come into contact with the lower end T1 of the upright windows 14 (14a, 14b), withstanding the weight of the existing pile P and allowing the existing pile P to be extracted.

[0042] In this way, the claws 1 (1a, 1b) support the tip P1 of the existing pile P and pull out the casing 3, so that even if the existing pile P is broken in the middle, the entire existing pile P can be pulled out together with the casing 3.

[0043] Finally, the claw lowering process is performed again to lower the claws 1 (1a, 1b) toward the inner circumferential wall of the casing 3, releasing the support for the tip P1 of the existing pile P, thereby causing the existing pile P to fall and land. Specifically, as shown in Figure 5(a), at the location where the existing pile P is to be lowered, the hydraulic cylinder 7 is compressed to lower the claws 1 (1a, 1b), and the casing 3 is pulled up, thereby lowering the existing pile P to the ground and completing the extraction of the existing pile P (see Figure 5(b)).

[0044] In Example 1, the claw lowering process was performed first, but this is not necessarily the only option and can be modified as appropriate. If the claws 1 (1a, 1b) have already lowered towards the inner circumferential wall of the casing 3, the claw lowering process does not need to be performed.

[0045] Furthermore, in Example 1, the casing 3 was embedded in the casing embedding process so that the claws 1 (1a, 1b) were deeper than the tip P1 of the existing pile P. However, this is not necessarily limited to this and can be modified as appropriate. For example, the claw erection process may be performed at a point shallower than the tip P1 of the existing pile P to support the middle of the existing pile P (between the tip P1 and the end P2) and then the casing extraction process may be performed. In this case, it is preferable to form the tips of the claws 1 (1a, 1b) at an acute angle.

[0046] Thus, in Embodiment 1 of the present invention, the chucking mechanism drive device drives the chucking mechanism of a pile extraction machine, A cylindrical casing, A hydraulic cylinder provided in the casing, Multiple claws that can be raised or lowered by the extension and retraction of the aforementioned hydraulic cylinder, A chucking mechanism drive device characterized by having such a feature allows a single hydraulic cylinder to drive multiple jaws, enabling multiple jaws to be raised or lowered simultaneously and completely.

[0047] Furthermore, in Embodiment 1 of the present invention, the pile extraction method involves pulling out existing piles, The casing embedding process involves burying a cylindrical casing in the ground so that it is positioned around the existing pile, A claw erection step is performed by driving a hydraulic cylinder provided in the casing to raise a plurality of claws toward the center of the cross-section of the casing, The pile extraction method is characterized by performing a casing extraction step, in which the casing is pulled out, thereby supporting and pulling out the existing pile with the multiple claws. Because a single hydraulic cylinder drives multiple claws, the multiple claws can be raised or lowered simultaneously and completely. [Industrial applicability]

[0048] The chucking mechanism drive device for the pile extraction machine and the pile extraction method according to the present invention can be widely used in the field of extracting existing piles. [Explanation of symbols]

[0049] 1(1a, 1b): Nail 3: Casing 4: Outer cylindrical part 5: Tip cylindrical section 6 (6a, 6b, 6c): Claw support part 7: Hydraulic cylinder 8(8a, 8b): Rod 10: Pile extractor 11: Drill bit 12(12a, 12b): Claw shaft support 14 (14a, 14b): Standing window 20: Chucking mechanism drive device D: Direction of the casing tip P: Existing pile P1: Tip P2: End

Claims

1. A chucking mechanism drive device for driving the chucking mechanism of a pile extraction machine, A cylindrical casing that can excavate soil and dig into the ground, A hydraulic cylinder provided inside the casing, A connecting rod is connected to the hydraulic cylinder, and its tip extends across the cross-section of the casing, with the rod extending to the outside of the casing. The outer cylindrical portion to which the tip of the connecting rod is connected, The extension and retraction of the first hydraulic cylinder causes the outer cylindrical portion to move up and down, thereby providing multiple claws that can be raised or lowered. A chucking mechanism drive device characterized by comprising:

2. The chucking mechanism drive device according to claim 1, characterized in that when the first hydraulic cylinder extends, the plurality of claws stand upright towards the center of the casing cross section through the uprighting window and are supported at the lower end of the uprighting window, and when compressed, the tips of the plurality of claws face downward and collapse toward the inner wall of the casing.

3. This is a pile extraction method that involves pulling out existing piles. The casing embedding process involves excavating the soil around the existing pile and drilling downwards into the ground to position the cylindrical casing, A step of raising a claw, in which a connecting rod, whose tip extends outside the casing and crosses the cross-section of the casing, is driven by a hydraulic cylinder installed inside the casing, to drive the outer cylindrical portion toward the tip of the casing, thereby raising a plurality of claws connected to the outer cylindrical portion toward the center of the cross-section of the casing, A pile extraction method characterized by performing a casing extraction step, in which the casing is pulled out, thereby supporting and pulling out the existing pile with the plurality of claws.

4. The pile extraction method according to claim 3, characterized in that, prior to the casing embedding step, a connecting rod, whose tip extends outside the casing and crosses the cross section of the casing, is driven by a hydraulic cylinder provided inside the casing to drive the outer cylindrical portion in the opposite direction to the tip of the casing, thereby performing a claw tilting step in which the plurality of claws connected to the outer cylindrical portion are tilted toward the inner circumferential wall with the tip of the casing facing downward.

Images