JP2004100260A - Steel pipe chuck device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel pipe chuck device capable of chucking a thin and small calibered steel pipe pile to make rotational press-fit even in construction at the ground having large rotational resistance and surely obtaining chuck power at anytime. <P>SOLUTION: The steel pipe chuck device is so constituted that a steel pipe 200 is chucked from the inside by a chuck block 10 pushed out to the outside from a slide block 11 slidingly coming into contact with a tapered surface. It is so fixed that a casing 8 is projected downward to an output shaft 82 of an auger, it is so placed that a chuck rod 7 is inserted in the casing 8 from the inside of the output shaft 82 having a shaft hole bored in the direction of the axis, and it is connected to a chuck cylinder 3 hung upward of the output shaft in a non-rotating state through a bearing. The steel pipe chuck device 1 providing a plurality of stages in the direction of the axis to the tapered surface slidingly coming into contact with the chuck block 10 and the slide block 11 is provided. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a steel pipe chuck device for connecting a steel pipe pile to an output shaft of an auger when performing a rotary burying method or a rotary press-fitting method.
[0002]
[Prior art]
When steel pipe piles are pressed in as foundation piles for civil engineering and construction, an auger is used in the steel pipe press-in method. The steel pipe pile is connected to the output shaft of the auger and is rotated while being moved up and down along the leader of the pile driver, and is rotationally pressed into the ground, and is pulled out therefrom. In such a case, a steel pipe chuck device is attached to the auger as a device for connecting a steel pipe pile to the output shaft. As such a steel tube chuck device, for example, a device described in Utility Model Registration No. 2538036 is conventionally used. As an example. FIG. 9 is a cross-sectional view showing a steel pipe chuck device described in this publication.
[0003]
In this steel pipe chuck apparatus 100, sliding shafts 101 and 102 pass through the upper portion through the axis of the apparatus main body 103, and a clamp block 105 slides radially in a window 104 formed on the side of the apparatus main body 103. It is movably loaded. A slide block 106 penetrating the slide shaft 102 is in sliding contact with the clamp block 105 with tapered surfaces, and the slide block 106 is further fixed by a spring 108 mounted between the slide block 106 and an upper spring retainer 107. It is biased downward. An auger chuck 150 is fitted on the top of the apparatus main body 103, and a pin 151 is connected to penetrate laterally.
[0004]
Therefore, when the weight of the auger is applied to the steel pipe pile 200 from the pin 151 via the apparatus main body 103 in the state shown in the left half of the drawing, the steel pipe chuck device 100 is provided with the spring retainer 107 via the flange portion 109 of the sliding shaft 102. Is pushed down. Therefore, as shown in the right half of the drawing, the spring 108 is compressed, and the slide block 106 is pressed downward by the spring force, and the clamp block 105 slid on the tapered surface is pushed outward, and the steel pipe pile 200 is gripped. You.
[0005]
Then, the clamp shoe 110 provided on the clamp block 105 is strongly pressed radially against the inner surface of the steel pipe pile 200, and is connected to the auger via the steel pipe chuck device 100 by frictional force, and the steel pipe pile 200 is rotated by driving the auger. Then, press-fitting and pulling out of the ground are performed by lifting and lowering the auger. In this state, the stopper 111 is pushed in so as to restrict the elevation of the spring retainer 107, that is, the extension of the spring 108, and the clamp block 105 maintains the chucking state of the steel pipe pile 200 by the urging force of the spring 108.
[0006]
[Patent Document 1]
Japanese Utility Model Registration No. 2538036 (page 3, FIG. 1)
[0007]
[Problems to be solved by the invention]
However, such a conventional steel pipe chuck device 100 is not a structure suitable for chucking a thin-walled small-diameter steel pipe pile and rotationally press-fitting the steel pipe pile in construction on a ground having a large rotation resistance. That is, since the steel pipe chuck device 100 transmits the rotational force to the steel pipe pile 200 by the frictional force of the clamp shoe 110, the frictional force must be increased by increasing the pressing force to increase the rotational force. However, if the pressing force is increased while the pressing area on the steel pipe pile 200 is small, the stress of the pressed portion is increased due to the thin wall, and the steel pipe pile 200 is deformed. In order to reduce the stress, the area for pressing the steel pipe pile 200 may be increased. However, when the axial length of the clamp block 105 is increased, the radial dimension is also increased due to the tapered shape. The diameter of the chuck portion becomes too large to insert into the small diameter steel pipe pile 200.
[0008]
Further, in the case of the steel pipe chuck device 100, since the steel pipe pile 200 is pressed by the spring force of the spring 108, it has been difficult to obtain a sufficient chucking force. This has caused a problem that when the steel pipe pile 200 slips and runs idle, further tightening cannot be performed, so that a reliable chuck cannot be performed. Further, in the steel pipe chuck device 100, it is necessary to insert the stopper 111 in order to keep the chuck state, and there is a problem that the chucking operation is troublesome.
[0009]
Therefore, the present invention provides a steel pipe chucking device capable of chucking a thin-walled small-diameter steel pipe pile and rotationally press-fitting even in construction on a ground having a large rotation resistance, or solving the problem at any time. An object of the present invention is to provide a steel pipe chuck device that can be reliably obtained.
[0010]
[Means for Solving the Problems]
A steel pipe chuck device according to the present invention is assembled with an auger that outputs rotation, and a chuck block that is slidably mounted in a window of a casing inserted into the steel pipe so as to be slidable in the radial direction is relatively axially moved in the casing. A sliding block fixed to a chuck rod that moves in a sliding manner by a tapered surface, and the chuck block is pushed outward by the axial movement of the slide block to chuck the steel pipe from the inside; The tapered surface in which the block and the slide block are in sliding contact with each other is provided in a plurality of stages in the axial direction.
[0011]
According to the present invention, since the chuck block is pushed outward through the tapered surfaces of a plurality of stages, the overall pressing area can be increased while reducing the radial dimension in each stage. The rotation can be reliably transmitted without causing any stress on the steel pipe pile without applying stress.
[0012]
Further, in the steel pipe chuck device according to the present invention, a chuck block mounted on an auger that outputs rotation and slidably mounted in a window of a casing inserted into the steel pipe so as to be slidable in the radial direction is axially moved in the casing. A sliding block fixed to a chuck rod that moves in a sliding manner by a tapered surface, and the chuck block is pushed outward by the axial movement of the slide block to chuck the steel pipe from the inside; The casing is fixed so as to protrude downward with respect to the output shaft of the auger, and the chuck rod is arranged so as to be inserted into the casing from within the output shaft of the auger having a shaft hole drilled in the axial direction. It is connected via a bearing to a chuck cylinder suspended above the output shaft in a non-rotating state. It is characterized in.
[0013]
According to the present invention, when the chuck rod moves up and down by the expansion and contraction operation of the chuck cylinder, the slide block slides on the tapered surface of the chuck block, and the chuck block is pushed out of the casing and pressed against the steel pipe pile. Therefore, the chucking force can always be reliably obtained by driving the chuck cylinder, and the chucking operation can be performed extremely easily and in a short time.
[0014]
Further, in the steel pipe chuck device according to the present invention, a chuck block mounted on an auger that outputs rotation and slidably mounted in a window of a casing inserted into the steel pipe so as to be slidable in the radial direction is axially moved in the casing. A sliding block fixed to a chuck rod that moves in a sliding manner by a tapered surface, and the chuck block is pushed outward by the axial movement of the slide block to chuck the steel pipe from the inside; The casing is fixed so as to protrude downward with respect to the output shaft of the auger, and the chuck rod is arranged so as to be inserted into the casing from within the output shaft of the auger having a shaft hole drilled in the axial direction. It is connected via a bearing to a chuck cylinder suspended above the output shaft in a non-rotating state. , Wherein the sliding contact tapered surfaces of the chuck block and slide block is one that was provided a plurality of stages in the axial direction.
[0015]
According to the present invention, since the chuck block is pushed outward through the tapered surfaces of a plurality of stages, the overall pressing area can be increased while reducing the radial dimension in each stage. The rotation can be reliably transmitted without causing any stress on the steel pipe pile without applying stress.
When the chuck rod moves up and down due to the expansion and contraction operation of the chuck cylinder, the slide block slides on the tapered surface of the chuck block, and the chuck block is pushed out of the casing and pressed against the steel pipe pile. Therefore, the chucking force can always be reliably obtained by driving the chuck cylinder, and the chucking operation can be performed extremely easily and in a short time.
[0016]
Further, the following can be considered as embodiments of the steel pipe chuck device according to the present invention.
A plurality of the chuck blocks and the slide blocks are arranged in the axial direction, or a plurality of the tapered surfaces are formed in the axial direction.
The chuck block is hooked by a key and a key groove formed along a tapered surface that slides on the slide block.
The casing is fixed to an output shaft of an auger via a tubular member, ie, a yatco, and the chuck rod is connected to a chuck cylinder via a yatco rod.
The inclination of the tapered surface that slides between the chuck block and the slide block is inclined upward toward the axis.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a steel pipe chuck device according to the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a first embodiment of a steel pipe chuck device assembled to an auger having a hollow shaft as an output shaft.
[0018]
The auger 80 has a hydraulic motor 81 for outputting rotation, and is configured such that a high torque rotation is generated in the hollow shaft 82 via a reduction gear by driving the hydraulic motor 81. The hollow shaft 82 is rotatably provided in a gear case 83 via a bearing, and a gear 88 is integrally formed on the outer periphery thereof. A pinion gear 85 is attached to a rotation shaft 84 of the hydraulic motor 81, and meshes with a gear 86, and a pinion gear 87 coaxial with the gear 86 meshes with a gear 88. The steel pipe chuck device 1 of the present embodiment is assembled so as to connect the steel pipe pile 200 to the hollow shaft 82 of the auger 80.
[0019]
The support 2 is fixed on the hollow shaft 82 in the gear case 83, and a chuck cylinder 3 for chucking the steel pipe pile 200 is suspended. Two support beams 4 (4) are fixed to the support 2, and the chuck cylinder 3 is axially mounted with the tip of a piston rod 3 a protruding upward sandwiched between the support beams 4 (4). . The chuck cylinder 3 mounted on the shaft is suspended so as to be coaxial with the hollow shaft 82, and a rotation stopper 5 is attached to the cylinder tube 3b. The chuck cylinder 3 is configured such that a cylinder tube 3b is moved up and down by a working fluid. It can be moved up and down.
[0020]
In the chuck cylinder 3, a cup-shaped bearing holder 6 is axially mounted on a lower end of a cylinder tube 3b, and an upper end of a chuck rod 7 is inserted into the bearing holder 6 via a bearing. The rotatably suspended chuck rod 7 is inserted into a hollow shaft 82 of an auger 80 and further inserted into a casing 8 fixed to the hollow shaft 82. The casing 8 is configured such that a flange formed at an intermediate position is applied to the lower end of the hollow shaft 82 and is screwed, and is rotated integrally with the hollow shaft 82. (The upper part of the flange at the intermediate position of the casing 8 may be formed in a hexagonal shape, and may be inserted into a hexagonal hole of the hollow shaft 82 to transmit the rotational force.) The chuck rod 7 inserted into the casing 8 penetrates downward. A stopper 9 is screwed to the lower end so that the chuck rod 7 does not go up further when it hits the lower end surface of the casing 8.
[0021]
On the lower side of the casing 8 protruding from the hollow shaft 82, chuck blocks 10, 10,... For pressing and holding the steel pipe pile 200 from the inside are provided. Here, FIG. 8 is a sectional view taken along the line AA of FIG. 1 showing a chuck portion of the steel pipe chuck device 1. The chuck blocks 10, 10,... Are arranged in two stages as shown in FIG. 1, and four chuck blocks 10, 10,. These are slidably loaded in a window 8 a formed in the casing 8, and a curved surface portion protruding from the casing 8 serves as a pressing surface 10 a that abuts along the inner peripheral surface of the steel pipe pile 200.
[0022]
On the other hand, a total of eight slide blocks 11, 11... Are fixed to the chuck rod 7 in two upper and lower stages corresponding to the chuck blocks 10, 10,. The sliding blocks 11, 11,... Slide in contact with the chuck blocks 10, 10,... On the tapered surface, change the downward pressing force acting on the chuck rod 7 into an outward lateral force, and move the chuck blocks 10, 10,. It is configured to be pushed outward. As shown in FIG. 8, the chuck block 10 and the slide block 11 are slid by the tapered surfaces and are hooked by a key groove 10k formed along the slope and a key 11k fitted in the key groove 10k.
[0023]
Next, the chuck operation of the steel pipe chuck device 1 will be described. Here, FIG. 2 is a cross-sectional view of the steel pipe chuck device 1 showing a chucked state, while FIG. 1 shows a non-chucked state.
The auger 80 has a hexagonal hole formed in the hollow shaft 82, and is used for transmitting the rotation of the hydraulic motor 81 to a screw rod or the like in which a hexagonal joint is inserted, for excavating the ground. When the steel pipe pile 200 is rotationally press-fitted by using the auger 80, the steel pipe chuck device 1 is assembled as shown in FIG. 1, and the steel pipe pile 200 is mounted on the casing 8 projecting downward from the hollow shaft 82. Is inserted and chucked. The upper end of the steel pipe pile 200 fitted into the casing 8 is abutted, and is gripped by driving the chuck cylinder 3 as follows.
[0024]
First, the chuck cylinder 3 is extended, whereby the bearing holder 6 and the chuck rod 7 are lowered according to the cylinder tube 3b lowered. When the chuck rod 7 is lowered, the slide blocks 11, 11 fixed thereto are pressed against the chuck blocks 10, 10,..., And the chuck blocks 10, 10,. It is pushed out of the. The chucking blocks 10, 10,... Pushed out of the window 8 a of the casing 8 have their pressing surfaces 10 a pressed strongly against the inner peripheral surface of the steel pipe pile 200. Then, the steel pipe pile 200 is gripped and chucked from the inside by an outward force extending in all directions of the chuck blocks 10, 10,....
[0025]
Thereafter, when the hydraulic motor 81 of the auger 80 is driven, rotation is given to the hollow shaft 82 via the reduction gear, and rotation of high torque is output from the hollow shaft 82. The rotation of the hollow shaft 82 rotates the casing 8 fixed thereto, and the rotation is given to the steel pipe pile 200 chucked by the chuck blocks 10 formed in the casing 8 through the window 8a. At this time, the chuck rod 7 also rotates via the slide blocks 11, 11,..., But the chuck cylinder 3 is not directly subjected to a rotational force because it is rotatably suspended on a bearing in the bearing holder 6. However, the rotation is received by the rotation stopper 5 hooked on the support 2, but the chuck cylinder 3 does not rotate.
[0026]
The steel pipe pile 200 rotated by the output of the hollow shaft 82 is rotationally press-fitted into the ground as the auger 80 further descends along the leader. At this time, the steel pipe pile 200 is pressed from above by the elevating force of the auger 80 and pressed into the ground because the upper end is abutted or because of the frictional force with the chuck blocks 10. Also, the rotation of the hollow shaft 82 is transmitted to the steel pipe pile 200 without slipping on the pressing surfaces 10a, 10a by the rotational reaction force received from the ground due to the frictional force with the chuck blocks 10, 10 pressed from the inside.
[0027]
On the other hand, when the chuck of the steel pipe pile 200 is released, the chuck rod 7 is pulled up via the bearing holder 6 by the contraction operation of the chuck cylinder 3, and the slide blocks 11, 11,... The chuck blocks 10, 10,... And the slide blocks 11, 11,... Have their keys 11k and key grooves 10k sliding along the slope of the tapered surface, and the chuck blocks 10, 10,. 8 is drawn inside. Are separated from the steel pipe pile 200, and the chuck is released.
[0028]
As described above, in this embodiment, the steel pipe pile 200 is chucked by the chuck blocks 10, 10... Provided in the upper and lower stages, so that the total area of the pressing surfaces 10a, 10a. . This is because the stress applied to the steel pipe pile can be reduced even when the chucking force is increased to reliably transmit the rotation to the steel pipe pile 200 without slipping on the ground having a large rotation resistance or in the case of a thin-walled steel pipe. Deformation and breakage can be avoided.
[0029]
Further, in the present embodiment, it is possible to cope with a small-diameter steel pipe pile or the like. That is, the chuck blocks 10, 10,... Are provided in a plurality of stages in the axial direction, and the taper surface for transmitting the force from the chuck cylinder 3 to the chuck blocks 10, 10,. The total area for pressing the steel pipe pile 200 can be increased while reducing the size, and the diameter of the chuck portion can be reduced.
[0030]
Furthermore, since chucking is performed by driving the chuck cylinder 3, even if the chuck blocks 10, 10,... Slip with the steel pipe pile 200, the chuck cylinder 3 is further extended to operate. It can be easily retightened. Since the steel pipe pile 200 is gripped and released by the fluid control, the chucking operation can be performed extremely easily and in a short time. Further, if the chuck cylinder force can be adjusted, a pressing force according to the specification of the steel pipe can be easily obtained.
[0031]
Next, a second embodiment of the steel pipe chuck device shown in FIG. 3 will be described. FIG. 3 is a cross-sectional view in which a steel pipe chuck device is assembled to an auger having a hollow shaft similarly to the first embodiment shown in FIG. In the present embodiment, a configuration in which the steel pipe pile can be driven particularly below the ground is added. In the drawings, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. .
[0032]
In the present embodiment, the casing 8 is not directly fixed to the hollow shaft 82, but a so-called Yatco 21 serving as a link for positioning the casing 8 further downward is fixed to the hollow shaft 82, and the casing 8 is fixed to the Yatco 21. ing. In order to connect the chuck cylinder 3 to the chuck rod 7 inserted in the casing 8, a YATCO rod 22 is connected between the bearing holder 6 and the cylinder 3.
[0033]
Therefore, when the chuck cylinder 3 expands and contracts, the chuck rod 7 moves up and down via the YATCO rod 22, and the chuck blocks 10, 10,... Grip and release the steel pipe pile 200. The output from the hollow shaft 82 causes the yatco 21 and the casing 8 to rotate, and the steel pipe pile 200 chucked to the casing 8 to rotate. Then, when the auger 80 descends the leader, the steel pipe pile 200 is rotationally press-fitted into the ground. When the steel pipe pile 200 is lowered to the lowermost end, the steel pipe pile 200 is driven deeper into the ground by the amount of the yatco 21.
[0034]
Subsequently, a third embodiment of the steel pipe chuck device will be described. This is different from the auger 80 that is inserted into the hollow shaft 82 and transmits rotation to a screw rod or the like as in the first and second embodiments, and is different from the auger 80 that is connected to the flange of the output shaft to transmit rotation. It is to be assembled. FIG. 4 is a sectional view showing a state where the steel pipe chuck device of the third embodiment is assembled to the auger. The same components as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and detailed description is omitted.
[0035]
The auger 90 has a hydraulic motor 91 for outputting rotation, and the driving of the hydraulic motor 91 transmits high-torque rotation to an output shaft 92 to which the mounting flange 99 is fixed. A rotatable output shaft 92 in the gear case 93 has a gear 98 integrally formed on the outer periphery thereof, and rotation from a hydraulic motor 91 is transmitted via a reduction gear. A pinion gear 95 is attached to the rotating shaft 94 of the hydraulic motor 91, meshes with a gear 96, and a pinion gear 97 coaxial with the gear 96 meshes with a gear 98. The steel pipe chuck device 30 of the present embodiment is attached to such an auger 90.
[0036]
In the steel pipe chuck device 30, the casing 31 is screwed to the mounting flange 99 so as to be integrated with the output shaft 92, and is rotated by driving the auger 90. The casing 31 is provided with chuck blocks 10, 10... Below an intermediate flange portion 31a against which the steel pipe pile 200 abuts, a bearing holder 6 is placed above the chuck block 10, and a chuck rod 7 having slide blocks 11, 11,. It is suspended rotatably.
[0037]
The output shaft 92 of the auger 90 is provided with a hole 92a through which cement milk, water or working air is fed through a drilling rod connected during an operation such as ground improvement. Therefore, the chuck cylinder 3 and the bearing holder 6 are connected via the connecting rod 32 penetrating the hole 92a, and the chuck rod 3 is rotatably supported with respect to the chuck cylinder 3.
[0038]
Next, the operation of the steel pipe chuck device 30 will be described. In the steel pipe chuck device 30, the casing 31 protrudes downward from the output shaft 92, the steel pipe pile 200 is fitted into the casing 31, and the upper end is abutted against the flange portion 31a. When the chuck cylinder 3 extends in such a state, the chuck rod 7 descends, and the chuck blocks 10, 10... Pushed out by the slide blocks 11, 11,. Is performed. Thereafter, when the hydraulic motor 91 of the auger 90 is driven, rotation of high torque is transmitted to the output shaft 92 via the reduction gear, and the casing 31 fixed thereto also rotates, and the chuck block formed on the casing 31 is rotated. The steel pipe pile 200 chucked by 10, 10,... Rotates.
[0039]
The chucked steel pipe pile 200 is rotated by the output from the output shaft 92, and descends along the leader on which the auger 90 is mounted to be rotationally pressed into the ground. At this time, the steel pipe pile 200 is pressed from above by the elevating force of the auger 90 due to the upper end butted or due to the frictional force with the chuck blocks 10, 10. (See FIG. 8) does not slip due to the rotational reaction force received from the ground due to the frictional force with the chuck blocks 10, 10,..., And the rotation is transmitted to the steel pipe pile 200.
[0040]
On the other hand, when the chuck of the steel pipe pile 200 is released, when the chuck cylinder 3 is contracted, the chuck rod 7 is pulled up via the connecting rod 32 and the bearing holder 6, and the positions of the slide blocks 11, 11,. Will be. When the slide blocks 11, 11 are raised, the chuck blocks 10, 10 are drawn into the inside of the casing 31, the pressing surfaces 10a, 10a are separated from the steel pipe pile 200, and the chuck is released.
[0041]
As described above, also in the present embodiment, the steel pipe pile 200 is chucked by the chuck blocks 10, 10... Provided in two stages in the axial direction, so that the pressing surfaces 10a, 10a. It has become possible to avoid deformation of thin steel pipe piles, etc., and to cope with small diameter steel pipe piles. Further, since chucking is performed by the chuck cylinder, chucking force can be reliably obtained, and chucking work can be performed extremely easily and in a short time. And even if the chuck block slips between the steel pipe piles, it is possible to easily retighten by further extending the chuck cylinder 3.
[0042]
As described above, one embodiment of the steel pipe chuck device has been described, but the present invention is not limited to this, and various changes can be made without departing from the gist of the present invention.
For example, the chuck block and the slide block may be modified as shown in FIGS. Note that the same reference numerals are given to the same configurations as those in the above embodiment. In FIG. 5, the taper surface corresponding to the two-stage slide blocks 11, 11 is formed in the axial direction to form one chuck block 35, thereby increasing the pressing area with the steel pipe pile 200, As in the embodiment, an effect that can be applied to a small-diameter steel pipe pile is exhibited. In FIG. 6, the chuck block 10 and the slide block 11 are vertically arranged in three stages, so that an effect that can be applied to a small-diameter steel pipe pile as in the above-described embodiment is obtained while increasing the pressing area with the steel pipe pile 200.
[0043]
Further, in FIG. 7, the inclinations of the tapered surfaces of the chuck block 10 and the slide block 11 are reversed, and when the chuck rod 7 moves up, the chuck block 10 is pushed out to chuck the steel pipe pile 200. Further, the window 8a of the casing 8 in which the chuck block 10 is fitted is formed to be large so that an appropriate gap is provided in the vertical direction. According to this, it is possible to cope with a small-diameter steel pipe pile while expanding the pressing area in the same manner as in the above-described embodiment, and when the steel pipe pile is pulled upward with a strong force, The slide block 11 rises, slides on the tapered surface, and the chuck block 10 is further pushed outward, and is pressed against the inner peripheral surface of the steel pipe pile with a stronger force.
[0044]
In the above embodiment, the plurality of slide blocks 11, 11... Are pushed down by the cylinder to push the plurality of chuck blocks 10, 10... Outward, but without using the cylinder, as in the conventional example shown in FIG. It is also possible to adopt a configuration in which the spring is attached downward by a spring 108 mounted between the spring holder 107 and the chuck to perform chucking by utilizing the weight of the auger.
[0045]
【The invention's effect】
The present invention employs a configuration in which a plurality of tapered surfaces that are in sliding contact between the chuck block and the slide block are provided in a plurality of stages in the axial direction, so that a thin small-diameter steel pipe pile is chucked and rotationally press-fitted even in construction on a ground having a large rotational resistance. It has become possible to provide a steel pipe chuck device capable of performing such operations.
Further, according to the present invention, the casing is fixed so as to protrude downward with respect to the output shaft of the auger, and the chuck rod is disposed so as to be inserted into the casing from within the output shaft of the auger having a shaft hole formed in the axial direction. With a configuration in which a chuck cylinder suspended above the output shaft in a non-rotating state is connected via a bearing, it is possible to provide a steel pipe chuck device that can reliably obtain a chucking force at any time. It became.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a steel pipe chuck device according to a first embodiment of the present invention when no chuck is performed.
FIG. 2 is a cross-sectional view of the steel pipe chuck device according to the first embodiment at the time of chucking.
FIG. 3 is a cross-sectional view of a steel pipe chuck device according to a second embodiment at the time of chucking.
FIG. 4 is a cross-sectional view of a steel pipe chuck device according to a third embodiment at the time of chucking.
FIG. 5 is a view showing a modification of a chuck portion.
FIG. 6 is a view showing a modification of a chuck portion.
FIG. 7 is a view showing a modified example of a chuck portion.
FIG. 8 is a sectional view taken along the line AA of FIG. 1 showing a chuck portion of the steel pipe chuck device 1.
FIG. 9 is a sectional view showing a conventional steel pipe chuck device.
[Explanation of symbols]
1 Steel pipe chuck device
3 Chuck cylinder
6 Bearing holder
7 Chuck rod
8 Casing
10 Chuck block
11 Slide block
80 Auger
81 Hydraulic motor
82 hollow shaft

Claims (7)

A chuck block, which is mounted on an auger that outputs rotation and is slidably mounted radially on a window of a casing inserted into a steel pipe, is fixed to a chuck rod that relatively moves in the casing in the axial direction. In a steel pipe chuck device that slides in contact with a slide block by a tapered surface, and the chuck block is pushed outward by an axial movement of the slide block to chuck the steel pipe from the inside,
A steel pipe chuck device wherein a plurality of tapered surfaces in sliding contact between the chuck block and the slide block are provided in the axial direction. A chuck block, which is mounted on an auger that outputs rotation and is slidably mounted radially on a window of a casing inserted into a steel pipe, is fixed to a chuck rod that relatively moves in the casing in the axial direction. In a steel pipe chuck device that slides in contact with a slide block by a tapered surface, and the chuck block is pushed outward by an axial movement of the slide block to chuck the steel pipe from the inside,
The casing is fixed so as to protrude downward with respect to the output shaft of the auger,
The chuck rod is disposed so as to be inserted into the casing from within the output shaft of the auger having an axial hole drilled in the axial direction, and the chuck cylinder is suspended above the output shaft in a non-rotating state. A steel pipe chuck device which is connected via a bearing. A chuck block, which is mounted on an auger that outputs rotation and is slidably mounted radially on a window of a casing inserted into a steel pipe, is fixed to a chuck rod that relatively moves in the casing in the axial direction. In a steel pipe chuck device that slides in contact with a slide block by a tapered surface, and the chuck block is pushed outward by an axial movement of the slide block to chuck the steel pipe from the inside,
The casing is fixed so as to protrude downward with respect to the output shaft of the auger,
The chuck rod is disposed so as to be inserted into the casing from the inside of the output shaft of the auger having an axial hole drilled in the axial direction, and the chuck cylinder is suspended above the output shaft in a non-rotating state. It is connected via a bearing,
A steel pipe chuck device wherein a plurality of tapered surfaces in sliding contact between the chuck block and the slide block are provided in the axial direction. The steel pipe chuck device according to claim 1 or 3,
The steel pipe chuck device is characterized in that the chuck block and the slide block are arranged in a plurality in the axial direction, or one in which a plurality of tapered surfaces are formed in the axial direction. The steel pipe chuck device according to any one of claims 1 to 4,
The steel pipe chuck device is characterized in that the chuck block is hooked by a key and a key groove formed along a tapered surface that slides on the slide block. The steel pipe chuck device according to any one of claims 1 to 5,
The steel pipe chuck device, wherein the casing is fixed to an output shaft of an auger via a cylindrical member, i.e., an auger, and the chuck rod is connected to a chuck cylinder via a yatco rod. The steel pipe chuck device according to any one of claims 1 to 6,
A steel pipe chuck device, characterized in that the inclination of the tapered surface in sliding contact between the chuck block and the slide block is inclined upward toward the axis.

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