JPH0619638Y2 - Internal support device for steel pipe pile - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention prevents deformation of a steel pipe pile due to the holding mechanism of a steel pipe pile holding mechanism such as a chuck of a pile driving machine for steel pipe piles or a moving device for steel pipe piles. The present invention relates to an inner surface supporting device for a steel pipe pile.

(Prior Art) Steel pipes, steel pipe sheet piles, steel pipe piles (hereinafter,
Because of its strong bearing capacity and economic efficiency, steel pipe piles are not only used as permanent structures such as revetment bridge construction, but also as temporary structures or support piles such as mountain retaining and deadline construction that cannot be covered with steel sheet piles. Is also widely used.

When press-fitting a steel pipe pile into the ground with a pile press-in / pull-out machine, while holding the outer circumference of the steel pipe pile with the chuck of the pile press-in / pull-out machine,
When the chuck is moved downward, the force from the chuck is transmitted to the steel pipe pile due to the frictional force between the steel pipe pile and the chuck, and this force presses the steel pipe pile into the ground against the penetration resistance.

Then, when driving the steel pipe pile on the hard ground, or when the steel pipe pile is long, since the penetration resistance becomes large, it is necessary to secure the frictional force between the steel pipe pile and the chuck for it.
The chuck holding force should be increased.

(Problems to be Solved by the Invention) As described above, since it is necessary to secure a large frictional force, if the steel pipe pile is clamped with a predetermined force or more, the steel pipe pile may be deformed. When the steel pipe pile is deformed, when it is used as a support pile, the cross-sectional shape may change and buckling may occur due to vertical load, resulting in a lack of predetermined axial compressive strength.

Further, in the case where the steel pipe pile is continuously driven and used as a temporary structure or the like, a grip is provided in the longitudinal direction on the outside of the steel pipe pile and the grips are engaged with each other continuously, but when the steel pipe pile is deformed. As a result, the grip is also deformed so that the grip cannot slide when press-fitting.

For this reason, it was also possible to prevent the deformation of the steel pipe pile when holding it by attaching a reinforcing member inside the steel pipe pile that is held by the chuck, but it is difficult to specify the holding position depending on the work situation. Since it is necessary to support the inner surface with a reinforcing material over the entire length of the steel pipe pile, it is very wasteful and impractical.

The same applies not only to a pile driver but also to a holding mechanism such as a moving device for a steel pipe pile.

The present invention has been made in view of such circumstances, and an object thereof is to provide an inner surface support device for a steel pipe pile that prevents deformation due to the holding force of a chuck or the like of a pile driver.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention comprises a projecting mechanism that is inserted into a steel pipe pile and presses the inner wall of the steel pipe pile outward. It is characterized in that it is provided with a self-propelled means having a tire and a drive mechanism that are in pressure contact with the inner wall of the steel pipe pile, and that the self-propelled means enables self-propagation in the steel pipe pile.

(Operation) In the inner surface supporting device of the present invention, after the tensioning mechanism is inserted into the inside of the steel pipe pile, the chuck such as a pile driver is pressed into the inside position corresponding to the position where the chuck is attached to the outside of the pile. A steel pipe pile is held by a chuck such as a pile driver, and is placed or moved. At this time, the holding force of the chuck is received by the tensioning mechanism via the held portion of the steel pipe pile, so that even if the holding force is increased, a large frictional force can be obtained without deforming the steel pipe pile.

(Example) Next, the Example of this invention is described in detail with reference to an accompanying drawing.

FIG. 1 is a view showing press-fitting of a steel pipe pile using one embodiment of the inner surface supporting device of the present invention.

Reference numeral 1 in the drawing is a pile press-in / pull-out machine, and a saddle 2 of the pile press-in / pull-out machine 1 is fixed to an upper end of a steel pipe pile 4 press-fitted into the ground via a clamp 5. A mast 7 is vertically provided on the saddle 2 via a base 6, and an arm 10 having a chuck 9 at its tip is slidably attached to a leader 8 of the mast 7. The arm 10 is lowered by the operation of a hydraulic device 11. Then, the steel pipe pile 12 held by the chuck 9 is pressed into the ground.

The body 9a of the chuck 9 is provided with two pairs of hydraulic cylinders 9b that are coaxially opposed to each other and pass through the center of the steel pipe pile 12. At the tip of a rod 9c of the hydraulic cylinder 9b, the steel pipe pile 12 is provided.
The movable claw 9d is formed so as to contact the outer peripheral surface of the. And the steel pipe pile 12 corresponding to the mounting position of this chuck 9
A hydraulic cylinder 17a having a structure similar to that of the above-mentioned chuck 9 is arranged inside of the hydraulic cylinder 17a at a position facing the hydraulic cylinder 9b, and the steel pipe pile 12 is provided on the rod 17b of the hydraulic cylinder 17a.
A movable claw 18 that abuts the inner wall of the is attached. Further, a tire 25 and a motor 26 for driving the tire 25 are provided at both upper and lower ends of the strut mechanism 23 as a self-propelled means that is pressed against the inner surface of the steel pipe pile 12 to move up and down.

Further, the main body 27 of the thrust mechanism 23 has a magnet 2 for position detection.
0 is attached, and the main body 9a of the chuck 9 is provided with a magnetic sensor 21 corresponding to the position of the magnet 20.

The elevating and lowering of the thrust mechanism 23 is performed by the motor 26 based on the signal received by the antenna 28 from the magnetic sensor 21.
Drive the inner surface of the steel pipe pile 12 to move to the position where the chuck 9 is mounted. The antenna 28 and the main body 27 are connected via the antenna cable 28a, and the winding device 29 adjusts the length of the antenna cable 28a by moving the main body 27.

Next, the operation of the present embodiment configured as described above will be described.

The tension mechanism 23 moves up and down inside the steel pipe pile 12 by the self-propelled means, and the chuck 9 holds the outside of the steel pipe pile 12 at a portion where the hydraulic cylinder 17a is pressed with a predetermined strength to move the movable pawl 18. The inner wall of the steel pipe pile 12 is pressed and fixed.

After that, the cylinder 9b of the chuck 9 is gradually pressed to obtain a predetermined frictional force, but the holding force of the chuck 9 causes the holding mechanism 23 to move through the held portion 12a of the steel pipe pile 12. Since the pressure is received by the claw 18, even if the holding force of the chuck 9 is increased, the steel pipe pile 12 is not deformed,
The frictional force between the chuck 9 and the steel pipe pile 12 can be increased.

Then, after obtaining the necessary gripping force, when the arm 10 of the pile press-in / pull-out machine 1 is lowered to complete the press-fitting for one stroke of the steel pipe pile 12, the mounting position of the chuck 9 is moved to the upper part. The self-propelled means is driven by the signal from the magnetic sensor 21, and the inner surface support device 22 is automatically moved to the position where the chuck 9 is mounted. Therefore, the next press-fitting operation can be started without re-adjusting the position of the thrust mechanism 23.

As described above, according to the present embodiment, the press-fitting into the hard ground and the use of the long steel pipe pile also require a large penetration force, without deforming the steel pipe pile, the chuck and the steel pipe pile By increasing the frictional force between them, the steel pipe pile can be easily press-fitted.

Further, in the present embodiment, the inner wall of the steel pipe pile 12 can be self-propelled by the action of the motor 26 and the tire 25 based on the signal from the antenna 28. Therefore, it is necessary to provide a winding mechanism for raising and lowering the thrust mechanism 23. Is eliminated and the device is simplified, and the position of the cylinder 17a of the tensioning mechanism 23 can be adjusted accurately and automatically without requiring human intervention.

As described above, in the above-described embodiment, the hydraulic cylinder or the pressing member is used as the means for pressing the inner wall of the steel pipe pile, but the invention is not limited to this, and other means can be adopted as long as the same effect can be obtained. . Further, the present invention can be applied not only to a hammer driving machine or the like, but also to a holding mechanism such as a steel pipe pile moving device, not limited to a pile driving machine.

(Effects of the Invention) As described above, the inner surface supporting device of the present invention is inserted into the steel pipe pile held by the pile driving machine, and is provided with the protrusion mechanism for pressing the inner wall of the steel pipe pile to the outside. It is possible to easily increase the frictional force between the chuck and the steel pipe pile without deforming the steel pipe pile due to the holding of the steel pipe pile.

For this reason, it is most suitable for driving steel pipe piles that require a large penetration force by driving into hard ground or using long piles, and further when continuously driving steel pipe piles with grips. In addition, since the tensioning mechanism can self-propel the inner wall of the steel pipe pile, it is not necessary to equip the tensioning mechanism with a winding mechanism, which simplifies the device and requires manual adjustment of the cylinder position of the tensioning mechanism. It can be done accurately and automatically without.

[Brief description of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view showing press-fitting of a steel pipe pile using the inner surface supporting device of the present invention. 1 ... Pile press-in / pull-out machine, 9 ... Chuck 12 ... Steel pipe pile, 22 ... Inner surface support device 23 ... Stretching mechanism

Claims (1)

[Scope of utility model registration request] 1. A self-propelled means having a driving mechanism which is inserted into a steel pipe pile and has a thrust mechanism for pressing the inner wall of the steel pipe pile to the outside, the thrust mechanism being in pressure contact with the inner wall of the steel pipe pile. An inner surface supporting device for a steel pipe pile, comprising: the self-propelling means capable of self-propelling in the steel pipe pile.