JPH0619633Y2 - Steel pipe press-in / pull-out device - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Use) 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 pile and tightened. A device is known in which a C-shaped band is moved up and down to press or pull out the piles one pitch at a time. Further, in order to break through a hard layer such as a pile, rock bed in the ground, pumice stone layer, etc. at the time of press-fitting, a device that rotates the pile together with the C-shaped band at the time of press-fitting is used. 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 is rotated in the forward and reverse directions about an axis perpendicular to the band, and the power generating means for the expanding and contracting means is provided on the tightening means. , The input shaft is provided with a gear, and both are engaged so that the power generation means is operated by the rotation of the gear, while the tightening means is loosely fitted to The fixed internal gear was formed by intermeshing the gear.

(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 portion and has a double structure, and serves as a loading platform for a counterweight 7 for pulling out the inner frame 6 and preventing the apparatus from rising. It is ready for use. In addition, the inner frame 6 has spikes 8 driven into the ground.
Are formed so as to be detachably projectable, and counteract the reaction force received by the rotating means 3.

A hydraulic cylinder is used as the lifting / lowering means 2, and four hydraulic cylinders are provided upright on the base 1 and around the opening 5 by pin coupling.

The rotating means 3 is supported by the elevating means 2 so as to be able to ascend and descend via a pin member, and is further provided with an annular frame 10 provided slidably along a guide post 9 standing on the base 1 and the frame 10. It is provided with an annular large gear 11 provided inside thereof in a state where it can freely rotate with respect to the frame body 10 within a plane defined by. Further, four hydraulic motors 12 are arranged on the frame body 10, and a small gear 13 attached to the output shaft thereof.
By engaging the large gear 11 with the large gear 11
Are formed so that they can be properly reversed.

The tightening means 4 includes a plurality of, in the present embodiment, three steel arc-shaped divided pieces 15a connected by a pin member 14 so as to be rotatable relative to each other. Via the hydraulic cylinder 17 for tightening, the central arc-shaped divided piece 15a of the three pieces is fixed to the large gear 11, and, for example, the steel pipe 18 penetrating this opening is tightened and rotated. It is formed so as to move up and down together with the means 3 and to be rotatable.

Further, on the tightening means 4, as a power generating means for the hydraulic cylinder 17, an oil tank 21, an oil pump 23 having a small gear 22 attached to the input shaft so as to be operated together with the rotation of the small gear 22, and a hydraulic pressure. A hydraulic unit 25 equipped with a wirelessly operated switching valve 24 for switching expansion and contraction of the cylinder 17 and a battery (not shown) for the switching valve 24 is mounted. Further, the internal gear 26 is fixed to the localization value on the frame body 10 side with the C-shaped tightening band 15 loosely fitted, and this is meshed with the small gear 22, and the large gear 11 is rotated by the hydraulic motor 12. By doing so, the internal gear 26, the small gear 2
The hydraulic pump 23 operates via 2 to generate hydraulic pressure,
The hydraulic cylinder 17 can be expanded and contracted by wirelessly operating the switching valve 24 from outside the apparatus.

Then, after the steel pipe 18 is positioned inside the tightening means 4 in the opened state by an appropriate means, the tightening means 4 is rotated by the rotating means 3 to generate a hydraulic pressure in the hydraulic unit 25, and a C-type is wirelessly operated. While tightening the steel pipe 18 by the tightening band 15 and rotating it together with the tightening means 4, the lifting means 2 pulls out the hydraulic cylinder in stroke units, or press-fits the counterweight 7 while preventing it from rising as described above. When pulling out by one pitch or press fitting is completed, loosen the tightening means 4,
After returning the elevating means 2 to the original state, the above operation is repeated.

At this time, the spikes 8 prevent the device from rotating due to the reaction force from the steel pipe 18 as described above.

(Effect of the Invention) As is apparent from the above description, according to the present invention, the tightening means is supported by the elevating means through the rotating means that passes through the center of the band and rotates in the forward and reverse directions about the axis perpendicular to the band. , A power generating means for the expanding and contracting means and a gear on its input shaft are provided on the tightening means, and both are engaged so that the power generating means is activated by the rotation of the gear, while the tightening means is loosened. In the fitted state, the internal gear fixed to the localization value of the ascending / descending portion around this is formed by meshing the 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]

1, 2, and 3 are partially cutaway plan views, front views, and side views of the steel pipe press-fitting and withdrawing device according to the present invention, and FIG. 4 is attached to the fastening means of the device shown in FIG. FIG. 5 is a plan view showing the hydraulic unit and its operating mechanism, and FIG.
It is a V line sectional view. 1 ... Base, 2 ... Lifting means, 3 ... Rotating means, 4 ...
... Tightening means, 5 ... Opening, 8 ... Spike, 17 ...
... tightening hydraulic cylinder, 18 ... steel pipe, 22 ... small gear, 25 ... hydraulic unit, 26 ... internal gear.

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
The lifting and lowering means is supported through a rotating means that rotates forward and backward about an axis perpendicular to this, and the power generating means for the expanding and contracting means and the gear on the input shaft are provided on the tightening means, and the gear While the two are engaged so that the power generation means is activated by the rotation of, while the tightening means is loosely fitted, the gear is engaged with the internal gear fixed to the localization value of the elevating part around this. Characteristic steel pipe press-in / pull-out device.