JP2009270403A - Clutch body for use in burial device for hollow pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clutch body for use in a burial device for a hollow pile, which is attached to a leading end of a rotary rod inserted into the hollow pile, so as to not only connect the rotary rod and an excavating section of the hollow pile together but also positionally fix another member, attached to it, in such a manner that the member can freely advance/recede in the axial direction of the hollow pile. <P>SOLUTION: The clutch body 31, which is attached to a lower end of the rotary rod 30, is provided with a fitting and insertion groove which is engaged with and disengaged from the excavating section 20 of the hollow pile 1 in upper and lower positions different from each other; and a lower end thereof is provided with an attachment portion for attaching other members (e.g. an ejection portion for injection of cement milk). Thus, when the clutch body 31 is engaged with/disengaged from the excavating section 20 in each of the upper and lower positions, the other members attached integrally with the clutch body can be moved upward and downward in the axial direction of the hollow pile, and the clutch body 31 can be used as an attachment for positionally fixing the other members in such a manner that they can freely advance/recede in the axial direction of the hollow pile 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a clutch body used for, for example, a ready-made hollow pile embedding device.

A hollow pile made of concrete is often used as a foundation pile. A clutch body that connects the two is known (see Patent Document 1).
FIG. 8 is a bottom sectional view of a hollow pile provided with this clutch body.
In order to embed the hollow pile 100, the clutch body 125 includes a propulsion unit 110 provided with a spiral blade 114 on the peripheral surface engaged with each other, and the propulsion unit A disposed at the lower end of the hollow pile 100, and the propulsion unit The excavation part 120 excavates the lower ground of the hollow pile prior to the propulsion by the 110 spiral wings 114, and the propulsion part 110 and the excavation part 120 rotate together while discharging the injection liquid from the excavation head 121 during excavation. Excavation / propulsion is performed, and when the excavation is finished, the clutch is removed and the excavation unit 120 is lifted while leaving the propulsion unit 10 in the foundation ground of the hollow pile 1.

This clutch body simply connects the rotational force of the rotating rod 130 to the excavating part 120 attached to the lower end of the hollow pile 100 so as to perform excavation with the rotational force of the rotating rod 130. For example, there is a demand for a mechanism capable of moving the excavating part 120 into and out of the hollow pile from the lower end of the hollow pile for the purpose of feeding cement milk from the lower end of the hollow pile 100 or moving other members up and down. It has been.
However, the conventional clutch mechanism has only a function of simply connecting the rotating rod, the excavation part, and the excavation part.
JP 2005-350914 A

  The present invention has been made in order to solve the above-described conventional problems. The object of the present invention is to attach to the tip of a rotating rod inserted into the hollow pile, and to connect the rotating rod and the excavation part of the hollow pile. It is not only to perform the connection, but also to be able to fix the position of other members attached to the hollow pile so as to advance and retract in the axial direction.

  The present invention is a clutch body used in a hollow pile embedding device that detachably connects a drilling portion disposed at a lower end portion of a hollow pile and a rotating rod inserted into the hollow pile, The clutch body is integrally provided at the lower end of the rotating rod, and the clutch body includes a connecting means for connecting to the excavation part at different positions in the vertical direction, and has an attachment part for attaching another member.

  According to the present invention, when the excavation part attached to the rotary shaft and the lower end of the hollow pile is connected to the clutch body at different positions in the vertical direction, the members attached integrally with the clutch body are different in the vertical direction in the axial direction of the hollow pile. It can be fixed in position. Therefore, it can be used as an attachment for a member that moves the clutch body forward and backward in the axial direction of the hollow pile.

  Hereinafter, a clutch body used in a ready-made hollow pile embedding device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an enlarged perspective view schematically showing a configuration of a clutch body according to an embodiment of the present invention.
The clutch body 31 is formed of a metal block such as a cylindrical cast iron. For example, a part of the cylinder is symmetrically arranged so that it can be inserted into a hole 21a of a top plate 21 shown in FIG. A notch surface 31a cut to the lower end, a stopper 31b formed by a step on the peripheral surface remaining on the upper end side by the formation of the notch surface 31a, and a predetermined width from the upper end of the notch surface 31a in the circumferential direction of the cylinder. A first insertion insertion groove 31d for inserting a protrusion 21c of the top plate 21, which will be described later, formed in a lacking manner and a predetermined distance above the first insertion insertion groove 31d, similarly in the circumferential direction of the cylinder And a first abutment surface between the first insertion groove 31d and the second insertion groove 31c, which are in contact with the excavation plate 22, respectively. 31f and the second between the first insertion groove 31d and the second insertion groove 31c And it includes a contact surface 31e, the.

  In order to discharge the root-setting liquid such as cement milk to other members, here, the root-setting liquid discharged from the hollow part 32 is discharged to the ground side front end portion (attachment portion) of the clutch body 31 to the side. A discharge part 33 as means is detachably attached.

The clutch body 31 has a first fitting insertion groove 31c, a second fitting insertion groove 31c, and a coupling position (a disengagement position with respect to the excavation part 20) for preventing rotation of the top plate 21 with a projection 21c described later. The engagement / disengagement position is changed by changing the engagement / disengagement position, and the other member (here, the discharge portion 33) attached to the tip of the clutch body 31 (rotating rod 30) is moved up and down in the excavation propulsion direction. The position can be changed and fixed.
In addition, about the structure of the attachment part which attaches another attachment member, the discharge part 33 can employ | adopt what joined to the clutch body 31 by what kind of joining methods, such as welding, screw engagement, and bolt joining, for example.

FIG. 2 shows, as an example of use of the clutch body 31 according to the embodiment of the present invention, a cross section of a part of an embedding device arranged at the tip of a pile in order to embed a pile, here, a hollow pile 1 in the ground. It is a side view.
The burying device A includes a cylindrical propulsion unit 10 disposed at the tip (lower end) of the hollow pile 1 to be buried, an excavation unit 20 joined to the tip (lower end) of the propulsion unit 10 by welding, for example, The rotary rod 30 is connected to the excavation unit 20 to prevent rotation and applies a rotational force to the excavation unit 20 and the propulsion unit 10.

The propulsion unit 10 includes a cylindrical body 12 attached to the tip of the hollow pile 1 and a propulsion spiral blade 14 provided on the peripheral surface.
A top plate 21 having an outer diameter substantially equal to the outer diameter of the cylindrical body 12 is joined to the underground end surface of the cylindrical body 12 so as to block the cylindrical inner surface. A rotation driving device (not shown) is connected to the ground side of the hollow rotating rod 30 inserted through the hollow pile 1 in order to rotate the entire embedding device A. The top plate 21 is provided with a hole 21a for fitting a substantially cylindrical clutch body 31 provided at the tip of the rotating rod 30 at the center.

The excavation unit 20 includes the top plate 21, a pair of leg portions 22a joined to the ground-side surface of the top plate 21 by, for example, welding, and a mountain-shaped coupling portion that couples the leg portions 22a. The whole consisting of 22b consists of the gate-shaped plate-shaped excavation board 22. FIG.
The clutch body 31 is fitted into the substantially rectangular space 22d between the pair of legs 22a. Further, a bottomed cylindrical protective means is provided at the upper center portion of the excavation plate 22 corresponding to the hole 21a of the top plate 21 so as to cover the space portion 22d and the clutch body 31 inserted into the space portion 22d. A cover 22e (see FIG. 3) is integrally provided.
At the center of the mountain-shaped connecting portion 22b, a notch portion 22c for inserting a discharge portion 32 (described later) for discharging the root-setting liquid continuously into the space 22d is formed downward. Yes. A plurality of excavating blades 23a to 23d for effectively excavating a hard ground are attached to the tip of the excavating plate 22.

  Inside the embedding device A, there is an annular intermediate plate 15 with which the front end surface of the hollow pile 1 abuts when the embedding device A is attached to the hollow pile 1, and the top plate 21 and the intermediate plate of the excavation unit 20. 15, for example, a roller (not shown) for rotating the intermediate plate 15 along the center of the axis of the hollow pile 1 is arranged. That is, the hollow pile 1 comes into contact with the top plate 21 of the embedding device A via the intermediate plate 15 and a roller (not shown), and when the embedding device A is rotated by the rotating rod 30, this rotational force is transmitted to the hollow pile 1. It is configured not to be.

  The clutch body 31 provided integrally with the tip (lower end) portion of the rotating rod 30 is associated with a protrusion 21c (see FIG. 3A), which will be described later, and is connected to a rotation stop provided around the center hole 21a of the top plate 21. It is configured to be detachable, and is configured so that it can be connected when the rotating rod 30 is rotated forward to rotate the entire burying device A, and can be released during reverse rotation and the rotating rod 30 and the clutch body 31 can be pulled out. Has been.

FIG. 3 is a perspective view showing the top plate 21 and the excavation plate 22 of the excavation unit 20. FIG. 3A shows the top plate 21, and FIG. 3B shows the excavation plate 22.
As shown in FIG. 3A, the hole 21a formed in the top plate 21 of the excavating part 20 has a shape that allows the clutch body 31 shown in FIG. 1 to be inserted but not the stopper 31b, for example, as shown in the figure. In addition, a shape substantially the same as the shape of the lower surface of the clutch body 31 is formed by partially cutting the periphery of the circular hole into a large-diameter fan shape.
By forming the hole 21a as described above, a protruding strip portion 21c is formed between the fan-shaped holes on the inner periphery of the top plate 21, and this protruding strip portion 21c is the first fitting of the clutch body 31. It is inserted into the insertion groove 31d or the second insertion insertion groove 31c and is connected to the clutch body 31 to prevent rotation. That is, the switching surface between the circular part and the fan-shaped part formed by cutting out the circular part of the hole 21a into a large-diameter fan shape, the protruding portion 21c is replaced with the first insertion groove 31d of the clutch body 31 or The contact surface 21b comes into contact with the clutch body 31 when it is inserted into the second insertion groove 31c.

As shown in FIG. 3B, the cover 22e that protects the discharge means as the protection means from the excavated earth and sand is fitted with the discharge portion 33 of the clutch body 31 at a position corresponding to the center portion of the bottom surface, that is, the notch portion 22c of the excavation plate 22. It consists of a fitting insertion hole 22f to be inserted and a cylindrical protective wall erected on the periphery of the bottom surface.
The diameter of the insertion hole 22f is substantially the same as the outer diameter of the discharge part 33 of the clutch body 31. When the discharge part 33 is inserted into the insertion hole 22f, the insertion hole 22f is blocked by the discharge part 33. It is configured to be.
The cover 22e does not necessarily have a cylindrical shape, and may be, for example, a polygon, an ellipse, or a cone as long as it protects the discharge means from excavated earth and sand.

Next, the assembly procedure of the embedding apparatus A will be described with reference to FIGS.
The assembling of the embedding device A is performed by inserting the clutch body 31 into the hole 21a of the top plate 21 and matching the position (height) of the first fitting insertion groove 31d with the height of the top plate 21. Is rotated in the excavation direction (clockwise direction in the present embodiment), and the ridge portion 21c of the top plate 21 and the first fitting insertion groove 31d of the clutch body 31 are engaged, that is, they are non-rotatably connected.
At this time, the first contact surface 31e shown in FIG. 1 is not in contact with the side surface of the excavation plate 22, and is disposed with an arbitrary gap.
When the embedding device A is assembled, the tip of the discharge part 33 of the clutch body 31 is inserted into the insertion hole 22f shown in FIG. 3B. That is, the insertion hole 22f is closed by the tip of the discharge part 33, and prevents the excavation soil from entering the burying apparatus A through the insertion hole 22f when the hollow pile 1 is embedded.

When the clutch body 31 and the top plate 21 are connected to each other to prevent rotation, the rotational force of the rotating rod 30 acts on the convex strip portion 21c of the top plate 21 from the first insertion groove 31d of the clutch body 31, and is propelled together with the excavating portion 20. The part 10 also rotates in the same direction for excavation.
Note that, due to the resistance of the ground to the rotation of the excavating part 20, a large stress is applied to the contact surface between the first insertion groove 31d of the clutch body 31 and the contact surface 21b of the convex part 21c, and the convex part 21c is compressed. It is possible to deform. In this case, as shown in FIG. 4, the clutch body 31 is further rotated in the excavation direction by the compression deformation of the protrusion 21c, and the contact surface 21b of the protrusion 21c and the first insertion groove are compressed and deformed. 31d abuts (arrow (i) in the figure) and the first abutment surface 31f arranged with the above-mentioned arbitrary gap abuts on the side surface of the excavation plate 22 (arrow (ii) in the figure). ). That is, when the ridge portion 21c is compressed and deformed, the clutch body 31 comes into contact with the contact surface 21b of the top plate 21 and the side surface of the excavation plate 22, and the stress applied to the excavation portion 20 is dispersed and rotated. Since the force is transmitted, it is possible to prevent the ridge portion 21c from progressing.

  On the other hand, when the rotating rod 30 is slightly rotated in the reverse direction, the rotation preventing connection between the clutch body 31 and the top plate 21 is released, and when the shape of the lower surface of the clutch body 31 matches the shape of the hole 21 a of the top plate 21, the clutch body 31. By pulling up the clutch body 31, the clutch body 31 can be pulled out from the hole 21a of the top plate 21.

  In addition, when the embedding of the hollow pile 1 is completed and the root hardening liquid is discharged from the discharge portion 33 shown in FIG. 1 to the ground on the tip end side, the first strip insertion groove 31d projects the ridges of the top plate 21. The clutch body 31 connected to the portion 21c is rotated in the direction opposite to the excavation direction to release the connection at the first insertion groove 31d. Subsequently, the clutch body 31 is lowered in the excavation propulsion direction (ground direction) in a disconnected state, the lower surface of the stopper 31b of the clutch body 31 is brought into contact with the upper surface of the top plate 21, and then the clutch body 31 is again moved. Rotating in the excavation direction, the second fitting insertion groove 31c and the ridge portion 21c of the top plate 21 are connected to prevent rotation.

  At this time, the discharge part 33 of the clutch body 31 protrudes into the notch 22c of the excavation plate 22 from the fitting insertion hole 22f formed in the cover 22e of the excavation part 20, and the discharge hole 33a of the discharge part 33 is outside the cover 22e. The fitting insertion hole 22f is closed at the base of the discharge portion 33 (see FIG. 6 described later).

Next, a method for burying a hollow pile using the burying apparatus A described above will be described.
FIGS. 5 to 7 are side views showing a part of the apparatus A in cross section in order to explain the process of embedding the hollow pile in the ground.
First, the cylindrical body 12 of the propulsion unit 10 is disposed at the lower end portion of the hollow pile 1 to be buried, and the propulsion unit 10 is hollow through a second fitting groove 31c (see FIG. 1) of the clutch body 31. The rotating rod 30 inserted into the pile is attached to the propulsion unit 10, and the propulsion unit 10 and the rotating rod 30 thus combined are arranged below the hollow pile. Subsequently, the hollow pile 1 equipped with the embedding device A is installed at a predetermined embedding position.
FIG. 5 shows a state in which the excavation head 21 has started to enter the ground in order to embed the hollow pile 1 using the burying apparatus A arranged at the lower end of the hollow pile 1 in this way.
In this state, the embedding device A rotates forward by the rotation of the rotating rod 30 and is propelled by the propulsion unit 10 while excavating the ground by the excavation unit 20 and the plural excavation blades 23a to 23d attached thereto. The hollow pile 1 is propelled into the ground by the propulsive force generated by the rotation of the spiral blade 14.

FIG. 6 shows a state where excavation by the embedding device A and propulsion of the hollow pile 1 have reached a predetermined depth (support layer).
That is, when the front end of the hollow pile 1 reaches a predetermined depth, the forward rotation of the rotating rod 30 is stopped, and then slightly reversed and stopped. Due to the reverse rotation of the rotating rod 30, the clutch body 31 is disengaged from the ridge portion 21 c (see FIG. 3A) provided on the top plate 21. In this state, as described above, the clutch body 31 is lowered in the excavation propulsion direction, the clutch body 31 is rotated again in the excavation direction, and the second fitting insertion groove 31c (see FIG. 1) and the ridges of the top plate 21 are rotated. The part 21c is connected to the rotation stop. Next, as shown in FIG. 6, the ground and its surroundings that have been excavated and stirred by the excavating unit 20 by discharging a root hardening liquid such as cement milk from the discharge hole 33 a of the discharging unit 33 exposed from the cover 22 e to the outside of the apparatus. Do the root of the department.

When the hollow pile 1 is driven into the ground while discharging the root-setting liquid in order to discharge the root-setting liquid over a wide range in the ground, the second insertion groove 31c and the ridge portion The excavation part 20 is rotated by the rotating rod 30 in a state in which 21c is connected. At this time, the excavation soil is prevented from being clogged in the discharge hole 33a for discharging the root-setting liquid by the discharge pressure of the root-setting liquid.
Further, after the discharge of the root hardening liquid is completed, the excavation unit 20 is rotated by the rotating rod 30 to stir the earth and sand, whereby the root hardening liquid can be further stirred into the ground.

FIG. 7 is a view showing a state where the rotating rod 30 is pulled up to the ground.
After the hollow pile is solidified as described above, the rotating rod 30 is reversed again to release the connection between the clutch body 31 and the protruding portion 21c, and the rotating rod 30 and the clutch formed integrally therewith The body 31 is pulled up. On the other hand, the propulsion unit 10 and the excavation unit 20 are disconnected from the rotary rod 30 (clutch body 31), and are embedded at a predetermined depth in a state of being integrated with the hollow pile 1.

As explained above, when the hollow pile 1 is being propelled into the ground, the discharge hole 33a for discharging the root-setting liquid is protected from the excavated soil by the cover 22e, and only when the root-setting liquid is discharged. Since 33a is exposed to the outside of the apparatus, it is possible to completely prevent foreign matter such as excavated earth and sand from being clogged in the discharge hole 33a and to effectively solidify the hollow pile 1.
The embedding device A according to the present embodiment leaves the propulsion unit 10 and the excavation unit 20 at the lower end of the embedded hollow pile 1 as they are in the ground. Therefore, the hollow pile 1 is embedded in a predetermined position, and the tip portion thereof can obtain a large support area by the spiral blade 14, and the soil cement formed by the discharged root-setting liquid and the earth and sand of the support layer ground. S and the embedment device A (the propulsion unit 10 and the excavation unit 20) can be integrated to exert a large resistance against the building load and the pulling-out force at the time of an earthquake.

  In addition, after embedding of the hollow pile 1 is completed, a material using a cement such as an improved body (soil cement) of excavated sediment and root-setting liquid (herein referred to as a binding material) inside the tip of the hollow pile 1 Is inserted, the lower end of the hollow pile 1 is coupled with the propulsion unit 10 and the excavation unit 20, and a greater resistance to the pulling force can be obtained.

  In the above embodiment, the discharge part 33 for discharging a root hardening liquid such as cement milk has been described as an example of the other member. However, the other member is not limited to this and is, for example, a drilling blade. In short, the present clutch body rotates the excavation part attached to the lower end of the hollow pile and the clutch body attached to the lower end of the rotary shaft inserted into the hollow pile when the hollow pile is embedded. Applicable to all pipes that can be selectively placed at the top and bottom as attachments, so that the clutch body can be hooked at different positions in the vertical direction of the pipe. Is possible. Therefore, the mounting portion is not necessarily limited to the lower end portion of the row mounting body.

It is a figure which shows typically the structure of the clutch body which concerns on embodiment of this invention. It is the side view which showed a part of embedding device with which the front-end | tip of the hollow pile was mounted | worn with the cross section. It is the perspective view which divided | segmented and showed the excavation part by the top plate and the excavation plate, FIG. 3A is a perspective view of a top plate and FIG. 3B. It is a figure explaining the contact state of a clutch body, a top plate, and an excavation board. It is a figure which shows the state which the excavation head started approaching in the ground. It is a figure which shows the state which excavation by the embedment apparatus A and the promotion of a hollow pile have reached the predetermined depth. It is a figure which shows the state which pulled up the rotating rod on the ground. It is lower end sectional drawing of the hollow pile provided with the conventional clutch body.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Hollow pile, 10 ... Propulsion part, 12 ... Cylindrical body, 14 ... Spiral blade, 15 ... Intermediate | middle board, 20 ... Excavation part, 21 ... Top plate, 21a ··· Hole, 21b ··· Contact surface, 21c ··· protruding portion, 22 ··· excavation plate, 22a ··· leg portion, 22b ··· connecting portion, 22c ··· notch portion, 22d ... Space part, 22e ... Cover, 22f ... Insertion hole, 23a, 23b, 23c, 23d ... Excavation blade, 30 ... Rotating rod, 31 ... Clutch body, 31a ... · Notch surface, 31b ··· stopper, 31c ··· second insertion groove, 31d ··· first insertion groove, 31e ··· second contact surface, 31f ··· first Contact surface, 32 ... hollow part, 33 ... discharge part, 33a ... discharge hole.

Claims (3)

A clutch body used in a hollow pile embedding device for detachably connecting a drilling portion disposed at a lower end portion of a hollow pile and a rotating rod inserted into the hollow pile,
The clutch body is integrally provided at the lower end of the rotating rod,
A clutch body used in a hollow pile embedding device, characterized in that the clutch body has a connecting means for connecting to the excavation part at different positions in the vertical direction and has an attachment part for attaching another member. A clutch body used in the hollow pile embedding device according to claim 1,
The connecting means includes first and second connecting portions that are arranged on the circumferential surface at predetermined intervals in the vertical direction and are connected to a locking portion provided in the excavation portion. A clutch body used for a hollow pile embedding device. In the clutch body used for the hollow pile embedding device according to claim 1 or 2,
The locking portion is a plate-like body provided with a protrusion on the inner periphery of the hole through which the clutch body is inserted, and provided integrally with the hollow pile. A clutch body used in a hollow pile embedding device, characterized in that the first and second fitting grooves are arranged at a predetermined interval.

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