JPS6046211B2 - Cylindrical pile rotation press fitting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylindrical anti-rotation press-fitting method that allows ready-made cylindrical piles to be press-fitted into the ground without removing soil, without vibration, and without noise.

Next, the present invention will be explained in detail using illustrated examples.

The drawing shows an example of a cylindrical pile press-in device used to carry out the present invention, and is arranged at the front part of a crawler base machine 7 having a telescoping tower 5 and a buttress column 6 at intervals in the left and right direction. A holding frame 9 equipped with a plurality of vertical guide rails 8 is fixed, and support legs 10 are fitted on both left and right sides of the holding frame 9 so as to be able to rise and fall freely.
The upper end portion and the upper part of the holding frame 9 are connected via a hydraulic cylinder 11 for lifting and lowering the supporting leg, and guide members 13 are integrally provided on both left and right sides of the annular lifting frame 12.
The lower end of the piston rod of the frame elevating cylinder 14 is connected to the upper part of the elevating frame 12, and the lower end of the cylinder of the hydraulic cylinder 14 is fitted to the guide rail 8 so as to be movable up and down.
is fixed to the upper end of the

The annular rotating body 15 is disposed within the elevating frame 12 and supported via a bearing 16 so as to be rotatable and non-elevating. An annular driven gear 17 is fixed, and a large number of rotational drive devices 18 consisting of hydraulic motors are fixed around the upper part of the lifting frame 12.
The pinion 19 fixed to the rotating shaft of the annular driven gear 17
Further, the lower part of the outer tube 20 is fixed to the annular rotating body 15, the lower end of the outer tube 20 is fixed to the annular lower pile guide part 21, and the upper end of the outer tube 20 is fixed to the lower part of the outer tube 20. A casing 23 of an annular chuck device 22 is detachably fixed with bolts, and the chuck device 22 includes four chuck hydraulic cylinders 24 arranged radially and fixed to the casing 23 and a piston of the hydraulic cylinders 24. It is composed of a chuck piece 25 fixed to the rod.

A steel inner tube 2 with a bottom is arranged concentrically within the outer tube 20.
An engagement protrusion 26 is provided at the lower end of the polling head 1 , and an engagement recess 27 that engages with the protrusion 26 is provided at the upper part of the polling head 1 having screw wings. It is fitted to the lower end of the inner pipe 2 in a relatively unrotatable and removable manner, and furthermore, around the lower end of the inner pipe 2 there are small diameter water supply holes 2.
8 is provided, and the polling head 1 has the ability to penetrate into the ground by applying rotational force.

A connecting shaft 31 with a non-circular cross section is fixed to the lower end of a guide tube 30 having four longitudinal grooves 29 on its outer periphery.
Non-circular hole 3 of the connecting tube 32 fixed to the upper end of the inner tube 2
3, and the connecting shaft 31 and the connecting cylinder 32
The connecting pin 34 is fitted over the outer tube 2.
A swivel joint 35 is attached to the outer surface of the chuck 0, and the pressure fluid sent from a hydraulic unit (not shown) passes through the swivel joint 35 to the chuck hydraulic cylinder 24.
is supplied to the chuck piece 2 by its hydraulic cylinder 24.
5 is crimped onto the bottom of the vertical groove 29.

Note that the holding frame 9 in the cylindrical pile rotation press-fitting device,
The lifting frame 12, the annular rotating body 15, the outer tube 20, the chuck device 22, the guide tube 30, etc. are made of steel.

When rotary press-fitting a ready-made cylindrical pile into the ground using the cylindrical pile rotary press-fitting device configured as described above, the cylindrical pile 3 is fitted on the outside of the inner pipe 2, and the lower end surface of the cylindrical pile 3 is is placed on the upper plane of the polling head 1, and sand or other fine-grained friction material 4 is injected and filled into the tubular gap between the inner tube 2 and the cylindrical pile 3, and the frictional force of the friction material 4 causes the inner tube 2 to By integrating the and cylindrical pile 3 and rotating and press-fitting the inner pipe 2,
Transmits a rotational press-fit force greater than the ground friction force acting on the outer circumference of the cylindrical pile to the cylindrical pile.

Next, each rotation drive device 18 is operated to rotate the annular rotating body 15.
By rotating the outer tube 20, the chuck device 22,
The inner tube 2 is rotated at a low speed via the guide tube 30, etc., and the inner tube 2 rotates the cylindrical pile 3 via the friction material 4, and the polling head 1 is also rotated. Extend the cylinder 14 and lift the lift frame 1
2 and the annular rotating body 18 are lowered, the cylindrical pile 3 is rotationally press-fitted into the ground while forming a hole in the ground by the polling head 1.

After a predetermined stroke of rotational press-fitting is performed, the chuck hydraulic cylinder 24 is shortened to release the chuck device 22, and then the frame lifting hydraulic cylinder 14 is shortened to open the lifting frame 12 and the parts supported thereby. The annular rotating body 15, outer tube 20, chuck device 22, etc. are moved upward to the upper limit position.

Next, the guide tube 30 is gripped by the chuck device, and then the cylindrical pile 3 is rotated and press-fitted again as described above.

After the cylindrical pile 3 is press-fitted to a predetermined depth, water is sent from the upper end of the guide pipe 30 into the inner pipe 2, and the water is caused to flow upward through the water supply hole 28 between the inner pipe 2 and the cylindrical pile 3. The friction material 4 is washed out), and then the guide tube 30 and the inner tube 2 are lifted up by the crane 36 provided at the upper part of the tower 5, and the inner tube 2 is extracted from the cylindrical pile 3.

When carrying out this invention, a large number of protrusions or rough surfaces are formed on the outer circumferential surface of the steel inner tube 2 and the inner circumferential surface of the cylindrical pile 3,
The frictional force may be increased, and the vertical groove 2
9 and the number of chuck hydraulic cylinders 24 may be increased or decreased. Furthermore, the diameter of the water supply hole 28 may be slightly increased and a filter for preventing leakage of friction material may be attached thereto.
Note that the cylindrical pile 3 may be made of concrete or any other arbitrary material. According to this invention, the friction material 4 is injected and filled into the gap between the steel inner tube 2 to which the polling head 1 is detachably and unrotatably attached to the lower end, and the cylindrical pile 3 fitted on the outside thereof. Then, the inner tube 2
By descending while rotating, the rotational force and downward thrust of the inner tube 2 are transmitted to the cylindrical pile 3 by the frictional force of the friction material 4, and the cylindrical pile 3 is rotationally press-fitted into the ground. Therefore, the cylindrical pile 3 can be press-fitted into the ground without causing impact noise or ground vibration. In addition, when the top end of a cylindrical pile is gripped by a chuck device in a rotary press-in machine and the cylindrical pile is rotatably press-fitted into the ground, a strong gripping force acts on the top end of the cylindrical pile, and the cylindrical pile is There is a risk that the cylindrical pile may be damaged due to a strong torsional force, but in the case of this invention, the rotational force and thrust of the steel inner tube 2 are applied to almost the entire inner circumference of the cylindrical pile 3 via the friction material 4. Since the force is transmitted in a distributed manner over the surface, it is possible to obtain effects such as eliminating the possibility that the cylindrical resistor 3 will be damaged by strong rotational force and thrust force.

[Brief explanation of drawings]

The drawings show an example of a cylindrical pile rotary press-fitting device used in carrying out the present invention, in which FIG. 1 is an overall side view, FIG. 2 is a front view showing a rotary press-fitting drive unit, and FIG. 3 is a front view showing a rotary press-fitting drive unit. is a partially longitudinal front view showing an enlarged view of the lower part of Fig. 2, Fig. 4 is a partially longitudinal front view showing the vicinity of the chuck device, Fig. 5 is a sectional view taken along line A-A in Fig. 4, and Fig. 6 is a sectional view taken along line B-B in Figure 3,
FIG. 7 is a sectional view taken along line CC in FIG. 4. In the figure, 1 is a polling head, 2 is a copper inner tube, and 3 is a polling head.
is a cylindrical pile, 4 is a friction material, 7 is a crawler base machine, 8
is a guide rail, 9 is a holding frame, 10 is a support leg, 11
12 is a hydraulic cylinder for lifting the supporting leg, 12 is a lifting frame, 13
1 is a guide member, 14 is a hydraulic cylinder for lifting and lowering the frame, 1
5 is an annular rotating body, 16 is a bearing, 17 is an annular driven gear, 1
8 is a rotation drive device, 19 is a pinion, 20 is an outer tube, 2
1 is a lower pile guide member, 22 is a chuck device, 24 is a hydraulic cylinder for chuck, 25 is a chuck piece, 28 is a water supply hole, 29 is a vertical groove, 30 is a guide pipe, 31 is a connecting shaft, 32 is a connecting cylinder, 34 is a connecting pin.

Claims (1)

[Claims] 1 A friction material 4 is injected and filled into the gap between a steel inner pipe 2 to which a boring head 1 is detachably and non-rotatably attached to the lower end and a cylindrical pile 3 fitted on the outside thereof, and then the above-mentioned By descending while rotating the inner tube 2, the friction material 4
A method for rotating and press-fitting a cylindrical pile, characterized in that the rotational force and downward thrust of the inner pipe 2 are transmitted to the cylindrical pile 3 by a frictional force, and the cylindrical pile 3 is rotatably press-fitted into the ground.