JP3437537B2 - Steel pipe pile torque transmission device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque transmission device used in the construction of a cylindrical steel pipe pile that is rotationally buried in the ground as a building foundation pile, and in particular, is connected to a hydraulic motor of external equipment, The present invention relates to a steel pipe pile torque transmission device that enables gripping movement of a steel pipe pile and transmission of a rotational force.

[0002]

2. Description of the Related Art Conventionally, in order to secure or enhance the bearing capacity of the ground of a building, the construction of a building foundation is performed by driving foundation piles (steel pipe piles P) at predetermined intervals, rotating press-fitting, etc., as shown in FIG. The construction method of constructing the concrete foundation B after performing the above work was adopted.

There are various methods for burying such foundation piles, such as a hammering method, a hydraulic cylinder driving method, a cement milk injection method, a rotary burying method, etc. Considering this, the rotary burying method has occupy a position as one of the main methods.

In the construction of this rotary burial construction method, a rotary device such as a hydraulic motor or a connecting device is attached to a hydraulic excavator, a crane or a working machine for an earth auger, and a steel pipe pile formed of a steel pipe is held and rotationally driven. It is done by letting. As these devices, Japanese Patent Application Laid-Open No. 7-25
No. 2831 and JP-A No. 2000-64282.

[0005]

However, in the device of the above-mentioned Japanese Patent Laid-Open No. 7-252831, the chuck arm is rotated by the hydraulic cylinder to actuate the steel pipe pile so as to hold the steel pipe pile. Since the steel pipe is gripped, there is a problem that excessive gripping force is applied to the steel pipe pile and deformation such as crushing is likely to occur. Further, since this device grips the outer peripheral surface side of the steel pipe pile, there is a problem that the entire device becomes large and the structure tends to be complicated with respect to the steel pipe pile.

On the other hand, in the device of Japanese Patent Laid-Open No. 2000-64282, the diameter of the clamp mechanism is reduced by devising a method of gripping (holding) the steel pipe pile from the inner peripheral surface side.
Since the support pawls and the rotary drive mechanism for expanding / reducing the diameter by hydraulically driving the clamp mechanism are arranged in the apparatus body, it is necessary to arrange (or form) a hydraulic power source, a hydraulic path, or the like. Therefore, the device becomes large in the vertical direction, and the structure tends to be complicated due to an increase in the number of parts, resulting in a problem that the device becomes expensive.

[0007]

[Purpose] The present invention has been made in view of the above problems and has been made to solve the problems. That is, the holding and rotating means of the steel pipe pile is separated, the structure is downsized and simplified, and the base pile can be gripped from the inner peripheral surface side without any power source and torque transmission can be performed. A steel pipe pile torque transmission device is provided.

[0008]

In order to achieve the above object, the steel pipe pile torque transmission device of the present invention is configured as follows.

That is, holding the steel pipe pile of the rotary buried type
In a steel pipe pile torque transmission device that transmits rotational force by
Allows transmission of torque to the output shaft of a hydraulic motor
A connecting joint (2) and a steel attached to the joint (2)
The housing (3) inserted through the upper end opening of the pipe pile and the friction body (40) which swings in the circumferential direction with the axial swing shaft (42) of the steel pipe pile are provided on one or two of the outer circumferences of the housing (3).
A clutch mechanism (4) disposed at the above-mentioned locations, the friction body (40) having an engaging portion (40a) that swings when the housing (3) rotates and frictionally engages with the inner peripheral surface of the steel pipe pile. And before
Located on the outer periphery of the housing (3), the housing
When moving in the direction of pulling out from the steel pipe pile of (3),
A chuck mechanism (5) that frictionally engages the peripheral surface.
And are characterized.

Further, in the chuck mechanism (5),
The clamp (50), which is swingably supported in the axial direction by the circumferential rotation shaft (51) of the steel pipe pile, is attached to the housing (3).
The clamps (5
0) may be configured to have a hooking portion (50a) which is pivotally biased to the inner peripheral surface of the steel pipe pile at a position above the rotation shaft (51) to frictionally engage.

Furthermore, in the chuck mechanism (5), the clamp () which is urged and rotated to the inner peripheral surface of the steel pipe pile by the operation of the shaft (60) penetratingly arranged in the axial center of the housing (3) and the cam mechanism. Actuating means (6) for forcibly rotating 50) in the direction away from the inner peripheral surface of the steel pipe pile may be provided in the housing (3).

The reference numerals in parentheses described in the claims and the means for solving the problems mentioned above are the reference numerals attached to the drawings for the purpose of facilitating the understanding of the constitution of the invention. Of course, it is not limited to the form in the drawing.

[0013]

With the above construction, the steel pipe pile torque transmission device of the present invention operates as follows. First, the steel pipe pile torque transmission device is connected to an output shaft of an externally provided hydraulic motor connected to the working machine. Then, the device is inserted into a steel pipe pile. By this insertion, the chuck mechanism arranged in the housing frictionally engages with the inner peripheral surface of the steel pipe pile to lock and hold the steel pipe pile in the pull-out direction. Further, when the housing is rotated by the hydraulic motor, the clutch mechanism frictionally engages with the inner peripheral surface of the steel pipe pile and transmits torque to the steel pipe pile.

Further, one or more friction bodies of the clutch mechanism swing in the circumferential direction with respect to the housing,
The engaging portion frictionally engages with the inner peripheral surface of the steel pipe pile.

In addition, by adopting the structure described in claim 2 , one or more clamps of the chuck mechanism swings in the axial direction with respect to the housing (vertical rotation in the axial direction). The hook portion frictionally engages the inner peripheral surface of the steel pipe pile with a force.

Further, by adopting the structure of claim 3 , the cam mechanism is actuated to forcibly rotate the clamp appropriately, whereby the frictional engagement of the clamp with the inner peripheral surface of the steel pipe pile is released.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a steel pipe pile torque transmission device according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a partially cutaway perspective view showing an overall view of the steel pipe pile torque transmission device of this embodiment, and FIG. 2 is an assembled perspective view of the steel pipe pile torque transmission device of this embodiment, and FIG. FIG. 4 is a schematic perspective view showing an arrangement state of a clutch mechanism and a chuck mechanism of the present embodiment, FIG. 4 is a longitudinal sectional view of one side of a steel pipe pile torque transmission device of the present embodiment, and FIG. 5 is a steel pipe of the present embodiment. FIG. 7 is a cross-sectional view of a housing of the pile torque transmission device at an upper end surface of a contracted portion, and FIG. 6 is a partially cutaway perspective view showing a rotary embedding operation state of a steel pipe pile using the steel pipe pile torque transmission device of the present embodiment. is there.

The steel pipe pile torque transmission device 1 of the present embodiment (hereinafter, abbreviated as "this device") is mainly composed of a joint 2, a housing 3, a clutch mechanism 4, a chuck mechanism 5, and an operating means 6. Has been done. The configuration of each component will be described in detail below.

First, as shown in FIG. 1, the joint 2 has a cylindrical shape, and an output shaft S of the hydraulic motor (hereinafter abbreviated as "output shaft") is fitted and inserted into the upper end surface of the joint 2. Connection port with a hexagonal cross section for fitting and insertion)
1 is opened, and a long hole 2 is formed on the side surface thereof so as to face each other.
Forming 2. Further, a flange 20 is formed at the lower end, and a bolt hole 2 for mounting the fastening bolt 23
0a is opened at equally divided positions on the circumference.

In this embodiment, the connection port 21 is
Is a hexagonal cross-section, but is not limited to this, and may be, for example, a quadrangle or a semicircle as long as a rotational force can be transmitted, and further, a mechanical element such as a key or a key groove is used for connection. It may be configured. Further, in consideration of effectively exerting the pushing-down force on the steel pipe pile P, it is desirable that the output shaft S has a contact surface that contacts the upper end surface 24 of the joint 2.

The housing 3 has a substantially columnar shape having an outer shape that can be inserted into the inner space of the steel pipe pile P, has a through hole 31 penetrating vertically through the shaft center, and has a flange 30 at the upper edge thereof.
In the vicinity of the lower side of the flange 30, a contracted portion 32 having a substantially hexagonal cross section is formed. On the upper surface of the flange 30 of the housing 3, taps 30a corresponding to the bolt holes 20a on the side of the joint 2 and six rod holes 34 are formed at circumferentially equally divided positions. With this configuration, the joint 2 and the housing 3 are connected to each other with the flanges 20 and 30 in contact with each other and the fastening bolts 23 that penetrate the bolt holes 20a and the taps 30a.

The lower end edge of the housing 3 is formed in a tapered shape, and a spring chamber 33 is formed in the lower end opening of the through hole 31. Furthermore, at the position where the circumference 3 of the side peripheral surface on the lower end side of the housing 3 is equally divided, the through hole 3 is formed from the side peripheral surface.
1 and the spring chamber 33, and an operating port 35 is formed which is formed by a space which is deleted in a rectangular shape in the vertical direction. Further, on both sides of the operation port 35, a notch 36 cut out from the side peripheral surface is formed, and a pin hole 37 penetrating to the operation port 35 is formed in the notch 36.

The clutch mechanism 4 is arranged in the contracted portion 32 of the housing 3 and is composed of a total of 6 elements including one set of the friction body 40, the contact piece 41, and the swing shaft 42.

The friction body 40 is shown in FIG. 1, FIG. 2, and FIG.
As shown in FIG. 5, the cross-sectional shape is a substantially fan-shaped columnar body, and a plurality of engaging claws 4 extending vertically as engaging portions are formed on the arc side surface.
0a are formed in an array, and a storage groove 40b is formed in the central portion of the side surface of the arc so as to extend vertically. The storage groove 40b
, The contact piece 41 is housed with a leaf spring 41a interposed,
The contact piece 41 is configured to be urged radially outward with respect to the housing 3 by the elastic force of the leaf spring 41a. Note that the upper and lower ends of the engaging claw 40a and the contact piece 41 are chamfered in order to facilitate the fitting and insertion into the inner space of the steel pipe pile P.

In addition, a shaft hole 40c that penetrates vertically is formed near the center of the fan shape, and a swing shaft 42 composed of a two-stage shaft member is rotatably inserted in the shaft hole 40c. At the same time, the upper end of the swing shaft 42 is fitted into the rod hole 34 of the flange 30 to hold the friction body 40 swingably.

The chuck mechanism 5 is arranged in the operation port 35 and the notch 36 on the lower side of the housing 3, and mainly comprises a clamp 50, a rotating shaft 51, and a biasing spring 52 as one set. It consists of a total of 3 sets of elements.

As shown in FIG. 1, FIG. 2 and FIG. 3, the clamp 50 has a cam body having a substantially wing shape, is arranged in each of the working ports 35, and is exposed from the working port 35. A plurality of hooks 50 as hooks are provided on the surface on the side to be engaged.
a are arrayed. The clamp 50 has a substantially central portion at the pin hole 3 of the notch 36 facing the housing 3.
A pivot shaft 51 penetrating 7 pivots in a freely pivotable manner in the vertical direction. The shape of the clamp 50 will be described in the side view (see FIG. 4).
The upper end side 50b of 0a is located above the mounting position of the rotary shaft 51, and the upper end side 50b of the rotary shaft 51 is
Is set to be larger than that on the lower end side 50c.

Further, the bottom portion 5 at the opposite end of the hook 50a.
An urging spring 52, which is a compression coil spring arranged in the spring chamber 33, acts on 0d via a contact ring 53. The lower end side of the biasing spring 52 is supported by a sealing plate 54 mounted so as to seal the lower end opening of the spring chamber 33, and the expanding biasing force acts on the bottom portion 50d of the clamp 50 to cause the hook claw. 50a is rotated downward so as to be exposed from the operation port 35. Further, a shoulder portion 50e is formed on the upper side of the hip portion 50d, and the through shaft 6 to be described later is formed.
It is arranged so as to come into contact with the zero operating ring 62.

The actuating means 6 is arranged at the axial center of the housing 3, and has a penetrating shaft 60, a stone projection 61,
And an operating ring 62.

The penetrating shaft 60 is inserted and arranged in the penetrating hole 31 of the housing 3 so as to be vertically exposed, and the lower end portion protruding from the sealing plate 54 has a downward cone-shaped truncated cone-shaped projection. 61 is attached. Also, the through shaft 60
At the upper end of the head, a head 60 having a diameter increased through a step 60a
b is formed, and the step 60a abuts the upper end opening edge of the through hole 31 to suppress the movement of the through shaft 60.

Further, an annular operating ring 62 for operating as a cam mechanism is provided at the intermediate portion of the penetrating shaft 60.
Are arranged in an annular manner, and the chamfered lower end portion 62a is fixed at a position where it abuts the shoulder portion 50e of the clamp 50. The hook 50 of the clamp 50 is compressed while the biasing spring 52 is compressed in association with the downward movement of the penetrating shaft 60.
a is rotated in a direction away from the inner peripheral wall Pa of the steel pipe pile P and is housed in the working port 35.

[0033]

Operation of the present embodiment The present embodiment configured as described above operates as follows. The centrifugal direction and the axial direction used in the description of the operation are based on the steel pipe pile P which is the construction object.

First, the hydraulic motor M having the output shaft S is connected to an appropriate working machine. This working machine is not particularly limited as long as it has the ability to hold the hydraulic motor, move up and down, and press fit the steel pipe pile P. In addition, in this embodiment, as shown in FIG. 6, a hydraulic excavator E having high workability (movement) is used.

The device 1 and the output shaft S are connected by fitting the output shaft S into the connecting port 21 of the joint 2 (fitting insertion).
Then, the connection pin C is penetrated from the long hole 22. The steel pipe pile P used here is not particularly limited in terms of shape, size, strength, etc., but is mainly equipped with a blade disclosed in Japanese Patent No. 2893443, which is excellent in propulsion speed and stability during rotary embedding. Steel pipe piles are used. In addition, for example, the length of the steel pipe pile P is usually about 6 m, and the weight thereof is about 14 m.
It will be 0 to 150 kg.

This device 1 suspended from a hydraulic excavator E
Is moved to a position above the steel pipe pile P by operating the work arm E1. Then, at the target steel pipe pile P, the working arm E1 is lowered to move the housing 3 of the device 1
The lower end surface of the flange 30 is inserted until it abuts on the upper end surface of the steel pipe pile P. The connecting pin C bears the drooping support force of the device 1 at this time.

Chuck mechanism 5 of the apparatus 1 before insertion
Is the bottom portion 50 of the clamp 50 due to the action of the biasing spring 52.
d is pushed up and pivoted downward (arrow a in FIG. 4), and the hooking claw 50a is maintained in a state of being exposed from the operating port 35. Then, in the process of inserting the housing 3 into the inner space, the hooking claw 50a comes into contact with the inner peripheral wall Pa of the steel pipe pile P, but rotates upward while bending the urging spring 52 (arrow b in FIG. 4). Therefore, it will slide and move.

On the contrary, when a force in the direction of pulling out the device 1 from the steel pipe pile P (acting force when the steel pipe pile P is suspended and held) is applied, the hooking claw 50a which comes into contact with the inner peripheral wall Pa and the hip portion. The clamp 50 is rotated downward (arrow a in FIG. 4) in combination with the action force of the biasing spring 52 that pushes up 50d. At this time, from the lower end side 50c of the hook 50a to the upper end side 5
Since the turning radius of 0b is large, the hooking claw 50 is rotated with the rotation.
The bite of “a” into the inner peripheral wall Pa increases, and the frictional force increases. Thereby, the hooking claw 50a and the inner peripheral wall Pa are frictionally engaged with each other, and the chuck mechanism 5 grips the steel pipe pile P.

Further, the contact piece 41 of each friction body 40 of the clutch mechanism 4 slides on the inner peripheral wall Pa while bending the leaf spring 41a at the time of insertion into the steel pipe pile P, and at the end of the insertion, the abutment piece 41 of the leaf spring 41a. It is pressed against the inner peripheral wall Pa by the urging force (arrow c in FIG. 5).

Next, the steel pipe pile P gripped by the chuck mechanism 5 is suspended and supported by the working arm E1 and conveyed to a desired burying position to hold the steel pipe pile P vertically to the ground.

Here, when the hydraulic motor M is started to transmit the rotational force from the output shaft S to the device 1 through the joint 2, the friction bodies 40 of the clutch mechanism 4 are interlocked with this.
The contact piece 41 contacting the inner peripheral wall Pa acts as a lever fulcrum and rotates. That is, as shown in FIG.
When the device 1 is rotated in the clockwise direction (arrow d), an action force (arrow e) for moving the swing shaft 42 in the clockwise direction acts, and the contact surface of the contact piece 41 serves as a fulcrum. Then, the engaging claw 40a is rotated counterclockwise (arrow f). By this rotation, the engaging claw 40a causes the inner peripheral wall P of the steel pipe pile P to be
It bites into a and engages frictionally. When the rotational torque is transmitted to the steel pipe pile P due to this frictional engagement, the above-mentioned bite is further deepened, and the shearing force on the steel pipe pile P largely acts,
Higher torque will be transmitted. Note that, for example, the transmission torque required in this embodiment is 7000 to 8000N.
・ It is about m. Then, while rotating the steel pipe pile P,
The steel pipe pile P is buried in the ground by lowering the work arm E1.

Further, when the working arm E1 is pushed down in the process of burying, the connecting pin C penetrating the elongated hole 22 of the joint 2 and the output shaft S moves downward in the elongated hole 22. The lower end surface of the output shaft S comes into contact with the upper end surface of the head 60b of the penetrating shaft 60, and the penetrating shaft 60 is pushed down by a certain distance to operate the cam mechanism (arrow g in FIG. 4). When laid down, this downward movement causes the actuation ring 62 to abut and push down the shoulder portion 50e of the clamp 50, and the hook 50a of the clamp 50 is rotated upward (arrow b) to be pulled in from the actuation port 35 to the axial center side. It works like this. Then, further lowering of the actuation ring 62 causes the shoulder portion 50e of the clamp 50 and the actuation ring 6 to move.
It is fixed in the above-mentioned rotating state by causing frictional engagement with the side peripheral surface of 2. As a result, the frictional engagement between the chuck mechanism 5 and the inner peripheral wall Pa is released.

Next, when the steel pipe pile P reaches a predetermined depth, when the rotation of the hydraulic motor M is stopped, the friction body 40 of the clutch mechanism 4 swings and the frictional engagement of the engaging claw 40a occurs. It will be canceled. Further, if the release is insufficient, the hydraulic motor may be rotated slightly in the reverse direction.

The clutch mechanism 4 and the chuck mechanism 5
When the work arm E1 is lifted at the time when is released, the device 1 is hung and supported by the connecting pin C and can be smoothly pulled out from the steel pipe pile P.

Finally, the penetrating shaft 60, which was moved downward and fixed during the rotary burying operation, is forcibly operated upward. This forced operation may be performed by striking the stone projection 61 with a hammer or the like, or may be performed by directly lowering the work arm E1 and pressing the stone projection 61 against the ground. By this forced operation, the frictional engagement between the shoulder portion 50e of the clamp 50 as the cam mechanism and the operating ring 62 is released,
The clamp 50 rotates in the centrifugal direction and returns to the initial state in which the hook claw 50a is exposed from the operation port 35.

[0046]

[Potentials of Other Embodiments] In the above embodiments, the clutch mechanism 4 is arranged on the upper side of the housing 3 and the chuck mechanism 5 is arranged on the lower side. The configuration may be replaced with each other, and even in that case, the technical idea of the present invention can be realized.

[0047]

[Effects] Since the present invention is configured as described above, it is possible to reliably grip the steel pipe pile from its inner peripheral surface and transmit torque without requiring any power source. .

Therefore, the main body of the apparatus can be downsized and the cost can be reduced. Also,
Since it can also be used as an attachment for existing hydraulic excavators, it is possible to improve work efficiency.
The contribution of the present invention to the industry is great.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an overall view of a steel pipe pile torque transmission device of the present embodiment.

FIG. 2 is an assembled perspective view of the steel pipe pile torque transmission device of the present embodiment.

FIG. 3 is a schematic perspective view showing an arrangement state of a clutch mechanism and a chuck mechanism of this embodiment.

FIG. 4 is a longitudinal sectional view on one side of the steel pipe pile torque transmission device of the present embodiment.

FIG. 5 is a cross-sectional view of the upper end surface of the contracted portion of the housing of the steel pipe pile torque transmission device according to the present embodiment.

FIG. 6 is a partially cutaway perspective view showing a working state of rotary embedding of a steel pipe pile using the steel pipe pile torque transmission device of the present embodiment.

FIG. 7 is a partially cutaway perspective view showing a building foundation for enhancing ground support capacity.

[Explanation of symbols]

1 Steel pipe pile torque transmission device (this device) 2 joints 20 flange 20a bolt hole 21 Connection 22 long hole 23 Fastening bolt 24 Top surface 3 housing 30 flange 30a tap 31 through hole 32 Reduced section 33 Spring chamber 34 Rod hole 35 working port 36 Notch 37 pin hole 4 Clutch mechanism 40 friction body 40a Engaging claw (engaging part) 40b storage groove 40c shaft hole 41 Contact piece 41a leaf spring 42 swing axis 5 Chuck mechanism 50 clamps 50a Hooking claw (hooking part) 50b upper end side 50c Lower end side 50d hips 50e shoulder 51 rotation axis 52 bias spring 53 Reliable ring 54 Sealing board 6 actuation means 60 through shaft 60a step 60b head 61 stone projection 62 actuation ring 62a lower end B concrete foundation E hydraulic excavator E1 working arm M hydraulic motor C connecting pin S output shaft P steel pipe pile Pa inner peripheral wall

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E02D 7/22 E02D 13/00

Claims (3)

(57) [Claims] 1. A steel pipe pile torque transmission device for holding a steel pipe pile of a rotary burying type to transmit a rotational force, and a joint (2) for connecting the output shaft of an externally arranged hydraulic motor to enable torque transmission, and the joint. The housing (3) attached to (2) and inserted from the upper end opening of the steel pipe pile and the rocking shaft (42) in the axial direction of the steel pipe pile swings in the circumferential direction.
The friction body (40) for
The friction bodies (40) are arranged in two or more places, and the friction body (40) is a housing.
It swings during rotation of (3) and frictionally engages with the inner peripheral surface of the steel pipe pile.
A clutch mechanism (4) having an engaging portion (40a) for engaging with the inner peripheral surface of the steel pipe pile when the housing (3) is moved in the drawing direction from the steel pipe pile. A steel pipe pile torque transmission device comprising: a chuck mechanism (5) for mating. 2.In the chuck mechanism (5), Swing in the axial direction with the rotation axis (51) in the circumferential direction of the steel pipe pile
The clamp (50) supported so that it can be attached to the housing (3)
The clamps (5
0) is the inner peripheral surface of the steel pipe pile at a position above the rotating shaft (51)
Has a hook portion (50a) that is urged to rotate and frictionally engage with
The steel pipe pile tor according to claim 1, which has a structure.
Transmission device. 3.In the chuck mechanism (5), A shaft (6) penetrating through the axis of the housing (3)
By the operation of 0) and the cam mechanism, the urging force is applied to the inner peripheral surface of the steel pipe pile.
The clamp (50) that has been moved is forcibly forced from the inner peripheral surface of the steel pipe pile.
The actuating means (6) for rotating in a direction away from the housing
The steel pipe according to claim 2, wherein the steel pipe is provided in (3).
Pile torque transmission device.