JP3049645U - Piling equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a pile cutting device that prevents a heavy machinery disaster by eliminating the need for an operator to manually support an anchor when starting pile cutting. SOLUTION: A plurality of magnets are embedded in a distal end portion of a casing, and an anchor portion is fixed to the distal end portion by an attractive force of a magnetic field generated by the magnets. At this time, in order to eliminate the need for the operator to support the anchor, the anchor portion is fixed to the distal end portion so as to cover the opening at the distal end portion of the casing, and the pile is cut.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a pile drilling apparatus for drilling piles by penetrating a casing from a pile drilling point into the ground.

[0002]

[Prior art]

 Conventionally, various construction methods, such as a packed drain method and a high-frequency vibration method, have been used as pile driving methods for increasing the strength of soft ground. Fig. 5 shows an overview of the pile drilling conditions for general drain pipe driving. In the figure, arms 9 extend from a motor vehicle 8 for construction, and the pillars 6 are supported by these arms 9 vertically to the ground. A case 4 for pile cutting is attached to the column 6 in parallel. FIG. 5 shows a state immediately before the start of the drilling. After the casing 4 is positioned at one of the plurality of drilling points 10a to 10f (the point 10a in FIG. 5), the cutting for that point is performed. Pile is started. The motor unit 3 that rotationally drives the casing 4 itself is located on the upper part of the column 6, and moves downward in the vertical direction as the pile pile advances. The motor unit 3 receives the drive power from a motor vehicle 8 via a power cable 7.

[0003] At the tip of the casing 4, a head 1 having a blade for cutting pile is attached. When the casing 4 is driven to rotate by the motor 3, a spiral blade of the casing 4 and one end thereof are attached. The head 1 is penetrated into the ground from an intended pile-cutting point by the action of a rotary support 5 that supports the rotation of the casing 4.

The casing 4 is hollow for the insertion of a drain pipe, and the head 1 of the casing 4 has an opening described later. Therefore, it is necessary to cover this opening with a lid called an anchor before the start of drilling, in order to prevent soil and earth and sand from entering the casing 4 during the drilling. The anchor itself is to be left in the soil when the casing 4 is pulled up after the drain pipe is inserted after the drilling to the target depth is completed.

FIG. 6 shows a state of work at the time of attaching a conventional anchor. Conventionally, as shown in the figure, an operator 20 holds the anchor 2 by using, for example, a bark 11 and places the anchor 2 between the head 1 and the ground directly above the pile-cutting points 10a to 10f. We support in. The worker 20 keeps the anchor in that state until just before the head 1 starts rotating for pile cutting, and performs the work of releasing the anchor from the hand at the same time as the rotation.

[0006]

[Problems to be solved by the invention]

 However, according to the conventional anchor fixing method described above, the operator is forced to approach the heavy equipment called a pile driving device and support the anchor by hand, and furthermore, until the head 1 starts to rotate. Must support anchor. For this reason, there is a problem that the operation requires skill and the operation itself is extremely dangerous, such as releasing the anchor from the hand almost simultaneously with the start of the rotation of the head portion 1.

Further, as a working environment, a place where a pile is drilled is not always flat, and when a pile is drilled in a place having undulations, a foothold of a worker is deteriorated, and an anchor is manually moved. The problem is that working in an unnatural position to support increases the risk of contact with heavy equipment.

[0008] Furthermore, since the worker supporting the anchor must always be near the pile driving device at the time of work, the operator of the pile driving device often cannot see the worker, and the work is started. There is a problem that communication with each other and safety confirmation work do not proceed smoothly, such as cues for safety measures, and heavy equipment starts operating despite the inadequate posture of the workers.

The present invention has been made in view of the above-described problems, and has as its object to make the drilling operation unmanned, that is, the worker manually supports the anchor when starting the drilling. An object of the present invention is to provide a pile driving device which does not need to be operated and has improved work safety.

[0010] A further object of the present invention is to provide a pile driving device capable of quickly transporting the entire casing including a head portion to a pile driving point.

[0011]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention relates to a pile driving device for drilling a pile by penetrating a casing from a pile driving point into the ground, and a means for generating a magnetic field at the tip of the casing, and a magnetic field attracted by the magnetic field. An anchor portion, and the anchor portion is fixed to the distal end portion so as to cover an opening at the distal end portion of the casing.

[0012] Preferably, the attraction force caused by the magnetic field maintains a fixed state between the distal end portion and the anchor portion when an external force applied to the anchor portion in the axial direction of the casing is equal to or less than a predetermined value. When the external force exceeds a predetermined value, the anchor portion acts so as to be detached from the distal end portion.

More preferably, the magnetic field is generated by a plurality of flat permanent magnets embedded in the tip.

[0014]

[Embodiment of the invention]

 Hereinafter, the pile driving device according to the present invention will be described in detail with reference to the accompanying drawings. The general configuration of the pile drilling apparatus according to the present invention and the overview of the pile drilling state using the pile drilling apparatus are the same as those shown in FIG. 5, and thus description thereof is omitted here.

FIG. 1 is a perspective view showing details of a head portion of the pile driving device according to the embodiment of the present invention. The head 1 shown in FIG. 1 is located at the tip of the casing 4 and moves in the direction of arrow A while rotating in a predetermined direction together with the casing 4. Then, the blades 13a and 13b provided on the head portion 1 separate the earth and sand and debris by the rotating force, so that the casing 4 and the head portion 1 penetrate into the ground, and the pile is cut.

The head 1 has an opening 14 through which a drain pipe is penetrated. Since the casing 4 is hollow as described above, soil or earth and sand is poured into the casing 4 during pile cutting. Need to prevent intrusion. For this reason, before starting pile cutting, the anchor 2 is attached so as to cover the opening 14. FIG. 1 shows a state before the opening 14 is covered with the anchor 2, and FIG. 2 shows a state where the opening 14 is covered with the anchor 2. Since the anchor is required to be a sheet-metal magnetic material having a predetermined mechanical strength due to its properties, a rectangular iron piece having a plate thickness of 6 mm is used here.

Four permanent magnets (magnets) 15 a to 15 d are embedded in a contact surface 16 of the head portion 1 with the anchor 2, and when the anchor 2 approaches the contact surface 16, The magnetic field generated by these magnets 15a to 15d causes the anchor 2 to be drawn in the direction of the arrow B (the axial direction of the casing) toward the tip of the head portion 1 so that the anchor 2 remains fixed to the head portion 1. It has become. Further, as described above, the anchor 2 remains in the soil when the pile is cut to the target depth and the casing 4 is pulled up after the drain pipe is inserted. For this reason, as described later, when a predetermined external force is applied, the magnet 15a is detached from the head portion 1 against the attraction force of the magnets 15a to 15d.

In addition, the anchor 2 and the blades 13a and 13b interact with each other so that the anchor 2 does not easily come off from the head 1 in the soil while the pile is being drilled. Take the structure. That is, the shape of the anchor 2 is rectangular, and as shown in FIG. 2, the anchor 2 and the blade portions 13a and 13b are in point contact or surface contact with each other at the C1 and C2 portions. By setting the diagonal dimension of the anchor 2 to be larger than the distance between the blades 13a and 13b, even if the head 1 rotates in any direction, the anchor 2 shifts in the rotation direction, It is prevented from falling off from the head 1.

FIG. 3 is a diagram showing a state of the head portion of the pile driving device according to the present embodiment as viewed from the front (state before covering with an anchor). In the figure, on the contact surface 16 with the anchor, four magnets 15a to 15d are arranged at an angle of 90 ° to each other, and the anchor is attached to the head portion 1 by the sum of the attraction forces generated by the magnetic fields generated by the magnets. It is fixed.

As described above, the anchor is attracted to the head portion 1 to maintain a fixed state with the head portion 1, and when a predetermined external force is applied to the anchor, the anchor separates from the head portion 1. It must be. Therefore, these four magnets 15a to 15d have a total attraction force that allows the anchor to be stably held on the head portion 1 when the anchor is attached before the start of the drilling, and during the drilling, and after the completion of the drilling. When an appropriate external force is applied to the anchor in a direction opposite to the direction of arrow B in FIG. 1, the anchor buckles to the external force and exerts a suction force enough to detach the anchor from the head portion 1. Designed.

Specifically, in the pile driving device according to the present embodiment, the total magnetic force by the magnets 15a to 15d is set to approximately 2.5 kg. That is, in the case of the present embodiment, the force (tensile force) required to separate the anchor fixed to the head portion 1 by the attractive force of the magnetic field in the direction opposite to the direction of the arrow B in FIG. It has been experimentally confirmed that the above-described relationship between the head portion 1 and the anchor can be maintained in an optimum state when the pressure is set to 0.5 kg. The intensity of the magnetic field generated by each of the magnets 15a to 15d is adjusted so that

FIG. 4 is a diagram showing a partial cross-sectional configuration when the head unit 1 of FIG. 3 is cut along a break line A-A ′. As shown in FIG. 4, a hole 18 for embedding the plate-shaped magnets 15a to 15d is formed in the head portion 1 of the pile driving device according to the present embodiment, and the hole 18 is embedded therein. The surface position of each magnet and the contact surface 16 with the anchor have the same depth. Further, the thickness T of the magnet used in the pile driving device according to the present embodiment is desirably 3 to 6 mm as described later, and here, T = 4 mm.

The inner surface of the hole 18 is coated with a moisture-proof paint 17 to suppress the generation of rust due to moisture in the soil. After the magnets 15a to 15d are embedded, By applying caulking to the wall surface, the magnet is fixed in the hole 18 while keeping the airtightness.

The thicknesses of the magnets 15a to 15d are determined based on the following factors. In other words, increasing the depth of the hole 18 acts in the direction in which the thickness of the head portion 1 decreases in the vicinity thereof, so that the mechanical strength of the casing (directly, the head portion 1) is reduced. descend. Therefore, for example, at the time of pile cutting, there is a possibility that a crack is generated or broken in the head portion 1 due to earth pressure or the like.

On the other hand, the shallower the hole 18 is, the smaller the mechanical influence on the casing is. However, in this case, the thickness of the magnet embedded in the hole is limited, and a desired magnetic field cannot be obtained. Insufficient suction power. Therefore, in consideration of the balance between the two factors, that is, the predetermined attractive force is obtained and the mechanical strength of the casing is maintained at a certain level or more, the thickness of the magnets 15a to 15d is set to T = 3 here. 〜6 mm.

The thickness and shape of the anchor are not limited to those described above, and the number of magnets provided in the head portion is not limited to the above number as long as a predetermined attractive force can be obtained. Needless to say.

As described above, according to the present embodiment, in the head portion of the casing, four magnets are embedded in the contact surface with the anchor, and the attraction force of these magnets causes the anchor to move to the tip of the head portion. By being drawn to the part and keeping it in a fixed state with the head part, there is no need for the worker to approach the pile driving device and support the anchor by hand, so the anchor can be installed easily and safely At the same time, there is a remarkable effect that a heavy equipment disaster caused by contact with the pile driving equipment can be reliably prevented.

Further, since it is not necessary for the worker to support the anchor by hand, the worker can be sufficiently separated from the pile drilling device after the anchor is attached and before the pile drilling is started, and from outside the working radius, Signals for starting pile drilling work can be sent smoothly and reliably to the operator of the pile drilling equipment.

Furthermore, since it is not necessary to mount the anchor at the pile-cutting point and can be attached at any place, the entire casing including the head portion is placed at the pile-cutting point without any human intervention in the pile-cutting work. It has the effect of being able to be transported quickly.

[0030]

[Effect of the invention]

 As described above, according to the first invention, a magnetic field is generated at the tip of the casing, and the anchor receiving the attraction force by the magnetic field is fixed to the tip so as to cover the opening at the tip of the casing. With this configuration, it is not necessary for an operator to support the anchor near the pile driving device, so that the anchor can be easily and safely mounted, and a heavy machinery disaster can be reliably prevented.

According to the second invention, in a state where an external force equal to or less than a predetermined value is applied to the anchor in the axial direction of the casing, the fixed state between the distal end portion and the anchor portion is maintained, and the external force is reduced to a predetermined value. If the value is exceeded, the suction force by the magnetic field is used to prevent the anchor part from being detached from the tip of the casing, so that the anchor can be held and prevented from dropping before and during drilling, and after drilling. At the same time, the removal of the anchor will proceed smoothly, and the drilling work will be progressed, and the casing will be quickly transported to the drilling point.

According to the third invention, the plurality of magnets embedded in the front end portion of the casing are made of flat permanent magnets, so that the influence on the mechanical strength of the casing can be minimized. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing details of a head portion of a pile driving device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state of a head portion of the pile driving device according to the embodiment of the present invention.

FIG. 3 is a diagram showing the head section of the pile driving device according to the embodiment of the present invention as viewed from the front.

FIG. 4 is a diagram showing a partial cross-sectional configuration of a head unit according to the embodiment of the present invention.

FIG. 5 is a view showing an overview of a pile cutting condition for general drain pipe driving.

FIG. 6 is a view showing a state of a work at the time of attaching a conventional anchor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Head part, 2 ... Anchor, 3 ... Motor part, 4 ... Casing, 5 ... Rotation support part, 6 ... Post, 7 ... Power cable, 8 ... Power vehicle, 9 ... Arm, 10a-10f ... Sharpening point, 11 ... finally, 13a, 13b ... blade, 14
... Openings, 15a to 15d ... Magnets (magnets), 16
... contact surface, 17 ... moisture-proof paint, 18 ... hole, 20 ... worker

Claims (5)

[Utility model registration claims] 1. A pile drilling apparatus for drilling piles by penetrating a casing from a pile drilling point into the ground, comprising: means for generating a magnetic field at a tip portion of the casing; and an anchor portion attracted by the magnetic field. The pile driving device according to claim 1, wherein the anchor portion is fixed to the front end portion so as to cover an opening at the front end portion of the casing. 2. The attraction force by the magnetic field, when an external force applied to the anchor portion in the axial direction of the casing is equal to or less than a predetermined value, maintains a fixed state between the distal end portion and the anchor portion, 2. The pile drilling device according to claim 1, wherein when the external force exceeds a predetermined value, the anchor portion acts so as to be detached from the distal end portion. 3. 3. The pile drilling device according to claim 1, wherein the magnetic field is generated by a plurality of flat permanent magnets embedded in the tip. 4. The pile cutting device according to claim 3, wherein the plurality of flat permanent magnets are arranged at an angle of 90 ° to each other. 5. The pile cutting device according to claim 1, wherein the anchor portion is a rectangular sheet metal magnetic material.