JPH0632988Y2 - Steel pipe press-in / pull-out device - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a press-in / pull-out device for steel pipes used for press-fitting and pulling out large-diameter steel pipe piles, concrete piles, etc. in foundation works for construction and civil engineering.

(Prior Art) Conventionally, as a device for press-fitting and withdrawing large-diameter steel pipe piles, concrete piles, etc., a steel C-shaped band, which is connected at both ends via hydraulic cylinders, is wound around the piles and tightened.
There is known a device for press-fitting or pulling-out the piles by one pitch by moving the C-shaped band up and down. Also,
When the pile hits a hard layer such as rock bed, boulder layer, etc. in the ground at the time of press-fitting, at the same time as press-fitting C
A device is used that rotates the stake with a shaped band. In the case of this device, a hose on the hydraulic unit side is provided by interposing a connector in the middle part of the pressure oil hose connecting the hydraulic unit provided on the fixed side of the device and the hydraulic cylinder attached to the C-shaped band. And the hose on the side of the hydraulic cylinder are connected when the rotation of the C-shaped band is stopped, and are used separately when rotating.

(Problems to be Solved by the Invention) In the above-mentioned conventional device, when the C-shaped band is used while being rotated or when the rotation is stopped, it is necessary to connect and disconnect the pressure oil hose each time. However, there is a problem that this is troublesome and the workability is poor.

The present invention has been made to solve the conventional problems, and an object thereof is to provide a press-in / pull-out device for steel pipes having good workability.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a base having an opening for penetrating a steel pipe, and a plurality of lifting means provided upright on the upper surface of the base around the opening. It is flexibly formed,
Steel pipe press-fitting / pulling-out provided with a steel pipe tightening band supported by the elevating means so as to be able to move up and down, and a tightening device interposed between both free ends of the band and expanding and contracting the distance between both free ends. In the device, the tightening means is supported by the elevating means through a rotating means that passes through the center of the band and rotates forward and backward about an axis perpendicular to the plane defined by the band, and the power generation for the expanding and contracting means is generated on the tightening means. Means and a driven gear of its input shaft are provided, while a drive gear is provided on a non-rotating portion to which the rotating means is attached so as to mesh with the driven gear, to be disengaged, and to be properly reversible.

(Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 and subsequent drawings show a steel pipe press-fitting / pulling-out device according to the present invention, in which a lifting means 2, a rotating means 3 and a tightening means 4 are provided on a base 1.

Of these, the base 1 has an opening 5 for penetrating steel pipes in the central part and has a double structure (not shown), and a counterweight of the counterweight for pulling out the inner frame to prevent the device from rising. It can be used as a loading platform. In addition, the inner frame is formed so that spikes driven into the ground can be detachably projected.
It opposes the reaction force received by the rotating means 3.

A hydraulic cylinder is used as the lifting means 2 (second
(See the drawing), four pieces are provided upright on the base 1 at the portions indicated by four corners A around the opening 5 by pin coupling.

The rotating means 3 includes a frame body 8 having a circular opening 7 slidably provided along a guide post 6 provided upright on the base 1, and a thrust bearing 9 in a plane defined by the frame body 8.
It is provided with an annular large gear 10 provided inside thereof in a state of being freely rotatable with respect to the frame body 8 via. Further, four hydraulic motors 11 (only one of which is shown by a broken line in FIG. 1) are arranged on the frame body 8, and a small gear 12 attached to the output shaft of the hydraulic motor 11 is meshed with the large gear 10 to make a large gear. The gear 10 is formed so that it can be rotated forward and backward as appropriate.

The tightening means 4 is formed by connecting a plurality of, for example, three steel arc-shaped divided pieces 13a in this embodiment by pin members 14 so that they can rotate relative to each other. 15 is connected by a tightening hydraulic cylinder 16 and the central arcuate divided piece 13a of the three pieces is fixed to the large gear 10 and, for example, a steel pipe 17 that penetrates this opening is tightened, And rotating means 3
Together with it, it is raised and lowered and is formed so as to be rotatable.

Further, a hydraulic circuit portion 18 including an oil tank and a driven gear 19 of the input shaft are mounted on the tightening means 4 as power generation means for the hydraulic cylinder 16 so that the oil can be operated together with the rotation of the driven gear 19. A pump 20 is mounted.

On the other hand, on the lower surface of the frame body 8, that is, the frame body 8 which can only be moved up and down, and which is a non-rotating portion, is provided a rotary drive means, for example, a hydraulic motor 22, which is supported so as to be movable back and forth along the guide rod 21, and the hydraulic motor There is provided a drive means 25 including a hydraulic cylinder 23 for moving the 22 forward and backward and a drive gear 24 attached to the motor shaft of the hydraulic motor 22. Then, as shown in FIGS. 3 and 4, from the state where the driving means 25 is at the retracted position,
By extending the hydraulic cylinder 23 and advancing the drive gear 24 together with the hydraulic motor 22, the drive gear 24 is moved forward as shown in FIGS.
As shown in the figure, the drive gear 24 is meshed with the driven gear 19, and the driven gear 19 is driven to properly rotate the oil pump 20 forward and backward to expand and contract the tightening hydraulic cylinder 16. .

Here, the driven gear 19 is rotatably provided together with the large gear 10 and the C-shaped tightening band 13 as described above, but its stop position must always be in a state capable of meshing with the drive gear 24. Therefore, by appropriate means, the drive gear 24
It stops at a fixed position where it can mesh with.

Then, after the steel pipe 17 is positioned in the tightening means 4 in the opened state by an appropriate means, the oil pump 20 is operated in the forward direction by the drive means 25 in the advanced state shown in FIGS. 5 and 6. Contract the hydraulic cylinder 16 for tightening to C
The steel pipe 17 is held by the shape fastening band 13. Further, after the drive means 25 is set to the retracted state shown in FIGS. 3 and 4 and the drive gear 24 is disengaged from the driven gear 19,
If necessary, the steel pipe 17 together with the C-shaped tightening band 13 is properly rotated in the forward and reverse directions by the rotating means 3, and together with this or separately, the frame 8 and the C-shaped tightening band 13 are moved by the elevating means 2.
Is lowered or raised, and with this, the steel pipe 17 is press-fitted or withdrawn by one pitch.

When the work for one pitch is completed, the drive means 25 is again brought to the forward state shown in FIGS. 5 and 6, the oil pump 20 is operated in the reverse direction, and the tightening hydraulic cylinder 16 is extended to form the C-shape. After loosening the tightening of the steel pipe 17 by the tightening band 13, the elevating means 2 returns the frame 8 and the C-shaped tightening band 13 to their original positions, and thereafter, the same operation as described above is performed to press fit and pull out the steel pipe 17. Work can be done one pitch at a time.

In this case, the counterweight prevents the device from rising when the steel pipe 17 is press-fitted, and the spike prevents the steel pipe 17 from rising.
The rotation of the base 1 due to the reaction force during the rotation of the
Prevents relative rotation of.

Although the driving means 25 is moved forward and backward in the above embodiment, the present invention is not limited to this.
In addition to these, the following are also included, for example. That is, the drive gear 24 itself is not moved from the forward position shown in FIG. 5 and FIG. 6, but the transmission of the rotational force such as a clutch is applied between the drive gear 24 and the motor shaft of the hydraulic motor 22. It also includes a device which can be manually or automatically turned on and off as required by interposing a cutting means. Further, the rotation driving means is not limited to the hydraulic motor 22 and may include an electric motor, for example.

(Effects of the Invention) As is apparent from the above description, according to the present invention, a base having an opening for penetrating steel pipes, a plurality of lifting means provided upright on the upper surface of the base around the opening, and freely bendable. And a tightening means that is provided between the free ends of the steel pipes and that is supported by the elevating means so as to be able to move up and down, and a stretching means that extends and contracts the distance between the free ends. In a steel pipe press-in / pull-out device, the tightening means is supported by an elevating means through a rotating means that passes through the center of a band and rotates forward and backward around an axis perpendicular to a plane defined by the band, and the expanding and contracting means is mounted on the tightening means. Power generating means and a driven gear for its input shaft are provided, while a non-rotating portion to which the rotating means is attached meshes with the driven gear and can be disengaged, and can be properly rotated forward and backward. It is formed by providing a drive gear.

Therefore, even when the tightening means is rotated and stopped, the work of connecting and disconnecting the power transmission means to and from the tightening means is unnecessary, and the workability can be improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view of a steel pipe press-in / pull-out device according to the present invention, FIG.
4 and 5 are partially enlarged sectional views and enlarged bottom views of the driving means portion in the retracted state, FIGS. 5 and 6 are partially enlarged sectional views and enlarged bottom views in the advanced state, and FIG. 7 is the driving means. It is a left side view of a part. 1 ... Base, 2 ... Lifting means, 3 ... Rotating means, 4 ...
... tightening means, 5 ... opening, 13 ... C-shaped tightening band, 16 ... tightening hydraulic cylinder, 19 ... driven gear, 23 ... hydraulic cylinder, 24 ... drive gear, 25 ...
… Driving means.

Claims (1)

[Scope of utility model registration request] 1. A steel pipe having a base having an opening for penetrating a steel pipe, a plurality of elevating means standing upright on the upper surface of the base around the opening, and formed so as to be bendable so as to be vertically movable by the elevating means. In a steel pipe press-fitting / pulling-out device including a tightening band and a tightening unit that is interposed between both free ends of the band and that expands and contracts the distance between the free ends, the tightening unit is the center of the band. Through
While supporting the elevating means through a rotating means that rotates forward and backward about an axis perpendicular to the plane defined by this, power generating means for the expanding and contracting means and a driven gear for the input shaft are provided on the tightening means. A steel pipe press-fitting / pulling-out device, characterized in that a non-rotating portion, to which the rotating means is attached, is provided with a drive gear that meshes with the driven gear and is capable of being disengaged and properly reversible.