Jack, clamp, pull-out device, and pull-out method

Abstract

To provide a jack of a pull-out device that can be easily carried and installed and can efficiently pull out a rod-shaped member.SOLUTION: A jack for pulling out a rod-shaped member partially embedded in the ground comprises an engaging portion that engages with a clamp that clamps a peripheral surface of the rod-shaped member protruding above the ground surface.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a jack, a clamp, an extraction device and an extraction method. [Background technology]

[0002] At construction sites, work sites, land where materials are temporarily stored, and the like, temporary structures such as temporary scaffolding and temporary enclosures are often set up. As the foundations of such temporary structures, rod-shaped members such as piles and pipes are sometimes buried in the ground, and the rod-shaped members are sometimes pulled out of the ground when the temporary structures are dismantled. Patent Document 1 is known as a method for pulling out rod-shaped members buried in the ground (JP Patent Publication No. 2004-044091). [Prior art documents] [Non-patent literature]

[0003] [Patent Document 1] JP 2004-044091 A Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, a movable arm is attached to one of a plurality of already installed piles, and a pile puller with a chuck of a leader attached to the movable arm pulls out the piles already installed around the one pile. With this method, it may be difficult to pull out a pile that is buried alone. The extraction device of Patent Document 1 includes the movable arm, a base for attaching the movable arm to the one pile, the leader attached to the movable arm, and the pile puller with a chuck of the leader, so that the size and weight are relatively large and it is not easy to carry and install, and as a result, there is a risk that the efficiency of the work of extracting piles, etc. cannot be improved.

[0005] In consideration of the above-mentioned circumstances, an object of the present disclosure is to provide a jack for an extraction device that can be easily carried and installed and can efficiently extract a rod-shaped member. [Means for solving the problem]

[0006] A jack according to one aspect of the present disclosure, made to solve the above problems, is a jack for pulling out a rod-shaped member, a portion of which is buried in the ground, and is provided with an engagement portion that engages with a clamp that clamps the peripheral surface of the rod-shaped member protruding above the ground surface. Effect of the Invention

[0007] A jack according to one aspect of the present disclosure can be easily carried and set up, and can efficiently extract a rod-shaped member. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic side view showing an extraction device according to one embodiment of the present disclosure. [Diagram 2] FIG. 2 is a schematic enlarged plan view of the extraction device of FIG. [Diagram 3] FIG. 3 is a schematic side view showing a state in which a jack of the extraction device of FIG. 1 is extended. [Figure 4] FIG. 4 is a schematic plan view showing a jack of the extraction device of FIG. [Diagram 5] FIG. 5 is a schematic enlarged perspective view showing a clamp of the extraction device of FIG. [Figure 6] FIG. 6 is a schematic perspective view showing an exploded state of the clamp of FIG. [Figure 7] FIG. 7 is a schematic front view of a first body of the clamp of FIG. [Figure 8] FIG. 8 is a schematic rear view of a first body of the clamp of FIG. [Figure 9] FIG. 9 is a schematic plan view of a first body of the clamp of FIG. [Figure 10]FIG. 10 is a schematic side view of a first body of the clamp of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Description of the embodiments of the present disclosure] First, the embodiments of the present disclosure will be listed and described.

[0010] (1) A jack according to one embodiment of the present disclosure is a jack for pulling out a rod-shaped member partially buried in the ground, and has an engaging portion that engages with a clamp that clamps the peripheral surface of the rod-shaped member protruding above the ground surface.

[0011] The jack has an engagement portion that engages with a clamp that clamps the part of the rod-shaped member that protrudes above the ground, so that by engaging this engagement portion with the clamp and extending it, the part of the rod-shaped member that is buried in the ground can be easily pulled out.

[0012] (2) In the above (1), the jack may have a retractable piston rod and a cylinder tube that houses a part of the piston rod, and the engagement portion may protrude from the outer surface of the cylinder tube in a direction perpendicular to the direction in which the piston rod retracts and retracts. This makes it possible to easily engage the engagement portion with the clamp.

[0013] (3) A clamp according to one embodiment of the present disclosure is a clamp that engages with a jack for pulling out a rod-shaped member partially buried in the ground, and clamps the peripheral surface of the rod-shaped member protruding above the ground surface.

[0014] The clamp clamps the circumferential surface of the portion of the rod-shaped member that is partially buried in the ground and protrudes above the ground surface so that the clamp can be engaged with a jack for pulling out the rod-shaped member. When the jack engaged with the clamp extends, the portion of the rod-shaped member that is buried in the ground can be easily pulled out.

[0015] (4) In the above (3), the clamp may include a first body and a second body that can be freely joined and separated, and a joining means for joining the first body and the second body. In this way, the peripheral surface of the rod-shaped member can be easily clamped.

[0016] (5) An extraction device according to one embodiment of the present disclosure is a device for extracting a rod-shaped member a portion of which is buried in the ground, and includes a clamp that clamps a peripheral surface of the rod-shaped member protruding above the ground surface, and a jack having an engagement portion that engages with the clamp.

[0017] The extraction device is easily portable because it is composed of the clamp that clamps the circumferential surface of the rod-shaped member protruding above the ground surface and the jack that can be engaged with the clamp. The extraction device can easily pull out the portion of the rod-shaped member buried in the ground by engaging the jack with the clamp and extending it.

[0018] (6) An extraction method according to one aspect of the present disclosure includes the steps of clamping a peripheral surface of a rod-shaped member, a portion of which is buried in the ground, protruding above the ground surface with a clamp, engaging an engaging portion formed on a jack with the clamp, and extending the jack to pull out a portion of the rod-shaped member from the ground.

[0019] This extraction method involves clamping the peripheral surface of the rod-shaped member protruding above the ground surface with the clamp, and engaging the jack with this clamp to extend it, making it easy to pull out the rod-shaped member buried in the ground.

[0020] [Details of the embodiment of the invention] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0021] <Extraction device> 1, 2 and 3 show the extraction device 10. The extraction device 10 includes a clamp 20 that clamps the peripheral surface of a rod-shaped member P protruding above the ground surface, and a jack having an engagement portion 31 that engages with the clamp 20.

[0022] [Rod-shaped member] The rod-shaped member P, a part of which is buried in the ground G, is not particularly limited, and may be a columnar member such as a pile, or a tubular member such as a pipe. The cross section of the rod-shaped member P is also not particularly limited, and may be a circle, an ellipse, a rectangle, a polygon, or the like. The rod-shaped member P is shown as a single pipe pile (cylindrical member) in Figs. 1, 2, 3, and 5. The rod-shaped member P is partially buried in the ground G, for example, by being driven into the ground or by being pressed in with heavy machinery.

[0023] 〔jack〕 The jack is not particularly limited as long as it is extendable and has variable height (total length), and may be operated by hydraulic pressure or gas pressure (air pressure), or may be a manual jack that extends or retracts by rotating a ball screw by an operator, but it is preferable to use a hydraulic jack 30 that can generate a relatively large lifting force (force exerted when extending). The hydraulic jack 30 extends or retracts by being connected to a known hydraulic unit (not shown) that integrates a power source, a hydraulic pump, etc.

[0024] The hydraulic jack 30 has an extendable piston rod (hydraulic cylinder) 32 and a cylinder tube 33 that houses a part of the piston rod 32. That is, the hydraulic jack 30 extends and contracts as the piston rod 32, a part of which is housed in the cylinder tube 33, advances and retreats.

[0025] The cross section of the piston rod 32 and cylinder tube 33 in the hydraulic jack 30 of this embodiment is substantially rectangular, and an engagement portion 31 is formed on one side of the cylinder tube 33. The engagement portion 31 is preferably provided at the end of the cylinder tube 33 on the side where the piston rod 32 advances and retreats. The hydraulic jack 30 is positioned so that the tip of the piston rod 32 contacts the ground surface. By providing the engagement portion 31 at the end, the hydraulic jack 30 can be positioned with the engagement portion 31 in a position close to the ground surface (low position).

[0026] 4, the engagement portion 31 includes a protruding portion 311 that protrudes from the outer surface of the cylinder tube 33 in a direction perpendicular to the extension and contraction direction of the piston rod 32. In other words, the protruding portion 311 is provided so as to stand on the one side surface of the cylinder tube 33.

[0027] The protruding portion 311 is, for example, a plate-like member or a substantially rectangular member formed in a substantially rectangular shape in a plan view, and is fixed to the cylinder tube 33 by a known means such as welding. The protruding portion 311 has a notch portion 312 formed by a pair of substantially parallel straight portions and an arc portion connecting the pair of straight portions. Specifically, the notch portion 312 is formed in a substantially U-shape. The interval (the distance between) between the pair of substantially parallel straight portions is formed to be larger than the outer diameter of the rod-shaped member P.

[0028] [Clamp] The clamp 20 is a member for clamping the circumferential surface of the rod-shaped member P protruding above the ground surface. The lower part of the clamp 20 clamping the circumferential surface of the rod-shaped member P (the part closer to the ground surface in a direction parallel to the axial direction of the rod-shaped member P, a part of which is buried in the ground G) engages with the engagement part 31 of the hydraulic jack 30, and the hydraulic jack 30 is extended to pull out the rod-shaped member P.

[0029] As shown in Figures 5 and 6, clamp 20 preferably includes first body 21 and second body 22 that can be freely joined and separated, and a joining means for joining first body 21 and second body 22. Because clamp 20 is configured so that it can be freely joined and separated by the joining means, it can easily clamp rod-shaped member P. In addition, clamp 20 can be easily carried. The joining means is not particularly limited, and examples thereof include known bolts 23.

[0030] It is preferable that the first body 21 and the second body 22 are formed in the same shape. This can improve the versatility of combinations when using a plurality of clamps 20. The first body 21 and the second body 22 of this embodiment are formed in the same shape.

[0031] The shapes of the first body 21 and the second body 22 are not particularly limited, and as an example of the first body 21, as shown in Figures 7 to 10, it may have a shape having a partially cylindrical main body portion 201 and flange portions 202 provided at the upper and lower ends of the main body portion 201.

[0032] An inner surface (surface facing the second body 22) 203 of the first body 21 is formed with an abutment surface 204 that abuts against the circumferential surface of the rod-shaped member P. Each of the flange portions 202 at the upper and lower ends is formed with two (four in total) female screw holes 206 that are formed to penetrate between the outer surface (surface opposite to the inner surface 203) 205 and the inner surface 203 and screw into the bolts 23. The four female screw holes 206 are formed to be approximately parallel to each other in the thickness direction of the outer surface 205 and the inner surface 203. The intervals between the female screw holes 206 in the width direction of the first body 21 (direction perpendicular to the axial direction of the rod-shaped member P in a front view) are formed to be larger than the outer diameter of the rod-shaped member P.

[0033] The contact surface 204 is preferably formed in a shape complementary to the peripheral surface of the rod-shaped member P. In other words, the contact surface 204 is preferably formed so as to be in close contact with the peripheral surface. In this way, the contact area with the peripheral surface of the rod-shaped member P can be increased, and the holding force of the rod-shaped member P (frictional force with the peripheral surface) can be increased. In order to increase the contact area with the peripheral surface of the rod-shaped member P, the first body 21 is preferably formed to have a certain height (length in the axial direction of the rod-shaped member P).

[0034] It is preferable that the depth of the abutment surface 204 (the maximum distance between the inner surface 203 and the abutment surface 204 in the normal direction of the inner surface 203) is less than the radius of the rod-shaped member P. In other words, it is preferable that the abutment surface 204 is formed so that the opposing inner surfaces 203 do not come into contact (have a gap) when the first body 21 and the second body are joined (or when a pair of first bodies 21 are joined, or when a pair of second bodies 22 are joined). In this way, the pressing force of the clamp 20 against the rod-shaped member P can be easily adjusted.

[0035] <How to remove> The extraction method includes the steps of clamping the peripheral surface of a rod-shaped member P, a portion of which is buried in the ground, protruding above the ground surface with a clamp 20, engaging an engagement portion 31 formed on a hydraulic jack 30 with the clamp 20, and extending the hydraulic jack 30 to extract a portion of the rod-shaped member P from the ground G.

[0036] [Clamping process] In the clamping step, the circumferential surface of the rod-shaped member P protruding above the ground surface is clamped by the clamp 20. Specifically, the first body 21 and the second body 22 are arranged with their respective inner surfaces 203 facing each other with the rod-shaped member P therebetween, and the bolts 23 are screwed into the respective female screw holes 206 to couple (fasten) them together. It is preferable that the clamp 20 clamps the circumferential surface of the rod-shaped member P protruding above the ground surface at a position close to the ground surface, within a range where the clamp 20 can engage with the engaging portion 31 of the hydraulic jack 30.

[0037] [Engaging step] In the engagement step, the engagement portion 31 formed on the hydraulic jack 30 is engaged with the clamp 20. Specifically, the hydraulic jack 30 is contracted and positioned substantially parallel to the rod-shaped member P with the engagement portion 31 positioned below the clamp 20 to accommodate the rod-shaped member P in the notch portion 312 (see FIG. 1). Next, the hydraulic jack 30 is extended to engage the upper surface of the protruding portion 311 with the lower surface of the clamp 20.

[0038] [Pulling out process] In the pulling-out process, the hydraulic jack 30 is extended to pull out a portion of the rod-shaped member P from the ground G. Specifically, the hydraulic jack 30 is extended to engage the upper surface of the protruding portion 311 with the lower surface of the clamp 20, and then the hydraulic jack 30 is further extended to pull out the portion of the rod-shaped member P that was buried in the ground G (see FIG. 3). If the extension of the hydraulic jack 30 does not completely pull out the buried portion of the rod-shaped member P, the clamp 20 may be disassembled and the hydraulic jack 30 may be shortened, and the clamping, engaging and pulling-out processes may be performed again.

[0039] <Advantages> The extraction device 10 is composed of a clamp 30 that clamps the circumferential surface of the rod-shaped member P protruding above the ground surface, and a hydraulic jack 20 that can engage with the clamp 30, and can therefore be easily carried to a work site. The extraction device 10 can easily extract the portion of the rod-shaped member P buried in the ground G by engaging the hydraulic jack 20 with the clamp 30 and extending it. Since the extraction device 10 can easily extract the rod-shaped member P, it is possible to efficiently dismantle temporary structures and reduce the burden on workers.

[0040] [Other embodiments] The above-mentioned embodiment does not limit the configuration of the present disclosure. Therefore, the above-mentioned embodiment may omit, replace, or add components of each part of the above-mentioned embodiment based on the description in this specification and common technical knowledge, and it should be construed that all of them belong to the scope of the present disclosure.

[0041] The notch of the protruding portion is not limited to being substantially U-shaped. The protruding portion may be formed, for example, in an arc shape (C-shape), or may be formed of a pair of substantially parallel straight line portions and a straight line portion connecting the pair of straight line portions (U-shape).

[0042] Furthermore, the protruding portion is not limited to being fixed to the cylinder tube by known means such as welding, and may be, for example, formed integrally with the cylinder tube. [Industrial Applicability]

[0043] INDUSTRIAL APPLICABILITY The extraction device of the present disclosure can easily extract rod-shaped members that are partially buried in the ground, and is therefore suitable for use in the dismantling of temporary structures, etc. [Explanation of symbols]

[0044] 10 Extraction device 20 Clamp 201 Main body 202 Flange part 203 Inside 204 Contact surface 205 Exterior 206 Female screw hole 21 First Body 22 2nd Body 23 Volts 30 Hydraulic Jack 31 Engagement part 311 Protruding part 312 Notch part 32 Piston rod 33 Cylinder tube G underground P Rod-shaped member

Claims

1. A jack for extracting a rod-shaped member partially buried in the ground, A jack having an engaging portion that engages with a clamp that clamps the peripheral surface of a rod-shaped member protruding above the ground.

2. The piston rod has a retractable piston rod and a cylinder tube that accommodates a part of the piston rod.

2. The jack according to claim 1, wherein the engaging portion includes a protruding portion protruding from an outer surface of the cylinder tube in a direction perpendicular to a direction in which the piston rod extends and retracts.

3. A clamp that is engaged with a jack for extracting a rod-shaped member partially buried in the ground, A clamp that clamps the peripheral surface of a rod-shaped member protruding above the ground surface.

4. 4. The clamp according to claim 3, comprising first and second bodies which can be freely joined and separated, and joining means for joining said first and second bodies.

5. A device for extracting a rod-shaped member partially buried in the ground, comprising: a clamp that clamps a peripheral surface of the rod-shaped member protruding above the ground surface; a jack having an engagement portion that engages with the clamp; An extraction device comprising:

6. a step of clamping, with a clamp, a peripheral surface of the rod-shaped member, a portion of which is buried in the ground, protruding above the ground surface; a step of engaging an engagement portion formed on a jack with the clamp; extending the jack to pull out a portion of the rod-shaped member from the ground; The extraction method includes:

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