JPH076186B2 - Method and apparatus for press-fitting steel pipe pile - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a press-fitting method for press-fitting a steel pipe pile into the ground and a press-fitting device used therefor. In the present specification, the steel pipe pile refers to a steel pipe, a steel pipe pile, and a steel pipe sheet pile.

(Prior Art and Problem to be Solved by the Invention) In order to press-fit a steel pipe pile into the ground, a method of pressing the steel pipe pile into the ground while holding the steel pipe pile is performed.

This method had difficulty in press-fitting piles on hard ground. this,
The increase in resistance during press-fitting was more remarkable in steel pipe piles with large pile diameters and large tip resistance, and in hard ground such as gravel and Dotan layers.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method of press-fitting a steel pipe pile that can be smoothly press-fitted into hard ground.

Another object of the present invention is to provide a press-fitting device for a steel pipe pile that can be suitably implemented with respect to the above press-fitting method.

(Means for Solving the Problem) In order to achieve the above object, the method of press-fitting a steel pipe pile of the present invention is to excavate the soil in the steel pipe pile while press-fitting the steel pipe pile into the ground, and to excavate the excavated soil. The steel pipe pile is press-fitted into the ground while being discharged from the steel pipe pile, and the discharged soil is put into the already-press-fitted steel pipe pile.

And, the press-fitting device of the steel pipe pile of the present invention applied to these press-fitting methods, a pile driving machine for press-fitting the steel pipe pile into the ground, a machine for excavating the ground while excavating, and a tightening while dropping the soil. With a compacting machine for hardening, the excavator is inserted into a steel pipe pile that is press-fitted into the ground by the pile driving machine to excavate and remove soil in the steel pipe pile, and the compaction machine in the discharged state. It is characterized in that it is arranged in a steel pipe pile press-fitted into the ground and the soil is filled in the steel pipe pile.

The excavator in this press-fitting device includes a main body to be inserted into a steel pipe pile to be press-fitted, an excavating means for excavating the soil in the steel pipe pile by an excavating blade configured in the main body, and a soil excavated by the excavating means. It can be characterized by comprising a soil discharging means for discharging.

Further, as a compactor in a press-fitting device for piles, a main body that is vertically movably inserted into a press-fitted steel pipe pile in a state where the soil inside is discharged, and the soil is put into the steel pipe pile below the main body. It can be characterized in that it comprises an inputting means and a compacting plate for compacting the soil input by the inputting means.

(Function) When soil is excavated in a steel pipe pile, the tip resistance decreases. Also, by pouring the soil discharged by excavation into the steel pipe pile that has already been press-fitted, the excavated soil processing is eliminated, and
Since the steel pipe pile is supported on its inner and outer surfaces, the bearing capacity does not decrease.

In the press-fitting device for a pile having the above-described configuration, the excavator excavates the ground in the steel pipe pile that is being press-fitted into the ground and discharges the soil to the outside, thereby leaving the inside of the steel pipe pile empty. On the other hand, the compactor puts the soil discharged by the excavator into the empty existing steel pipe pile and compacts it, so that the inside of the steel pipe pile is filled with soil.

(Embodiment) FIG. 1 shows a first embodiment of a method for press-fitting a steel pipe pile according to the present invention and a press-fitting device for a steel pipe pile used in this method.

The steel pipe pile press-fitting device is a pile driver 1 that press-fits the steel pipe pile Pn into the ground, the excavator 2 that is inserted into the steel pipe pile Pn, and the compaction that is inserted into the steel pipe pile P2 among the existing piles. And machine 3.

The pile driving machine 1 imparts a propulsive force for press-fitting the steel pipe pile Pn into the ground. In the illustrated example, a steel pipe pile press-fitting / pulling machine (hereinafter referred to as a pile driving machine) is used. This pile driver 1 is an existing pile P1
~ P6 is a new steel pipe pile Pn is pressed into the ground while self-propelled, equipped with a saddle 10 and a slide base 11 that move relative to each other in the front-rear direction, and existing piles P3 to P5 are located under the saddle 10 respectively. Three clamps 12 are hung vertically for gripping and releasing.

A mast 13 is erected on the slide base 11, and an arm 14 is attached to the tip of this mast 13.
A chuck 15 for holding a new steel pipe pile Pn is formed at the tip of 14. The steel pipe pile Pn is held while penetrating the inside of the chuck 15, and the steel pipe pile Pn is press-fitted into the ground when the chuck 15 descends.

The pile driver 1 presses the steel pipe pile Pn with the chuck 15 while holding the existing steel pipe piles P3 to P5 by the clamp 12. During this press-fitting, the clamp 12 releases the grip of the steel pipe piles P3 to P5 while holding the steel pipe pile Pn by the chuck 15 and slides the slide base.
Raise 11 to move forward one pile. After this movement, the clamp 12 again grips the existing piles P4 to P6 (see FIG. 1), the chuck 15 is lowered again, and the steel pipe pile Pn is re-pressed to complete the press-fitting. In this way, the pile driver 1 continuously presses the steel pipe piles into the ground while self-propelled on the existing piles.

The pile driving machine according to the present invention is not limited to the pile pressing machine of the present embodiment as long as it can press the steel pipe pile into the ground, and other types may be used.

The excavator 2 is used by being inserted into the steel pipe pile Pn to be press-fitted. Fig. 2 shows the internal structure of the excavator 2 and shows the steel pipe pile Pn.
It has a main body 20 to be inserted into the lower end of the. The outer diameter of the main body 20 is smaller than the pile diameter of the steel pipe pile Pn, and the steel pipe pile Pn is
A holding cylinder (21) is provided that presses against the inner surface and holds the main body (20) at the tip of the steel pipe pile. In this embodiment, the tip portion is held, but the holding position is not necessarily limited to the tip portion. The excavator 2 excavates the ground with the main body 20 thus held at the tip of the steel pipe pile Pn. For this reason the body 20
A motor 22 is provided in the shaft, and an auger 23 is provided in the axial direction to rotate by transmitting the rotational force of the motor 22 via a gear. And at the tip of the auger 23 a plurality of bits 24
The excavation head 24 having a is attached so as to rotate integrally with the auger 23, and the motor 22, the auger 23, and the excavation head 24 constitute excavation means.

In this case, a water supply hose 25 is attached to the upper end of the shaft of the auger 23.
And a nozzle 26 for injecting water W from the water supply hose 25 is attached to the lower end of the shaft of the auger 23, and water is injected during excavation to make excavated soil into a fluid mud.

In addition to such excavating means, the excavator 2 is provided with earth removing means for discharging the mud-like excavated soil from the inside of the steel pipe pile Pn to the outside. This earth removing means surrounds the outside of the auger 23 so that the main body 20
It is composed of a guide cylinder 27 provided inside, a discharge hose 28 connected to the upper end opening of the guide cylinder 27, and a suction pump 50. The suction pump 50 is a device for sending the excavated soil to the compactor 3. The other end of the soil discharge hose 28 is connected to the compactor 3, and the water supply hose 25 is connected to a water supply means (not shown).

Due to this, the excavated soil excavated by the excavation head 24 and turned into muddy by the water jetted from the nozzle 26 rises in the guide cylinder 27 by the rotation of the auger 23, is sucked by the suction pump 50, and passes through the soil discharge hose 28. And sent to the compactor 3.

Reference numeral 29 in the figure is a hook bracket provided on the upper surface of the main body 20, and hooks a wire or the like when the steel pipe pile Pn is inserted and removed.

By installing the excavator having such a configuration in the steel pipe pile Pn to be press-fitted into the ground, tip resistance and peripheral frictional resistance during propulsion are reduced, and press-fitting of a steel pipe pile with a large pile diameter becomes easy and hard. Press-fitting into the ground is also possible and the applicable range is expanded. It should be noted that the water injection at the time of excavation described above is an optional matter and may be unnecessary.

The compacting machine 3 is used by being inserted into the existing pile which is press-fitted into the ground by the excavator 2 in an empty state. FIGS. 3 (a) and 3 (b) show an embodiment of the compacting machine 3, which comprises a main body 30 inserted into the existing pile P2 and a compacting plate 31 provided below the main body 30. The end of the soil discharging hose 28 is connected to the compacting machine 3, and the discharged excavated soil M is put under the compacting plate 31.

The compaction plate 31 is a piston of a cylinder 33 provided inside the main body 30.
It is attached to the lower end of 33a and moves up and down integrally with the up and down movement of piston 33a. A dropping port 34 is formed at an appropriate position of the compaction plate 31 so as to penetrate vertically.
The dropping hose 34 is connected to the charging hose 32 by a bellows hose 35.

The compacting machine 3 configured as described above uses the suction pump 50 to remove the excavated soil W excavated by the excavator 2 from the soil discharge hose.
When it is thrown into the existing steel pipe pile P2 from the dropping port 34 of the compacting machine 3 through 28, the compacting plate 31 moves up and down and taps and consolidates this soil. Therefore, the existing steel pipe pile in the empty state is
Since it is filled with excavated soil that has been compacted by the method, supporting force is given and it is safe because no people or objects fall into the steel pipe pile. Since the soil filled in the steel pipe pile that has already been press-fitted is excavated soil from the steel pipe pile of the same pile row that has been press-fitted into the ground, there will be no residual soil treatment for this excavated soil and the work will be carried out smoothly. be able to.

The compacting machine 3 needs to move vertically in the steel pipe pile according to the height of the filled soil and stop at that position during compaction. Therefore, a hook bracket 36 on which wires for pulling up and down and the like are hooked is attached to the upper surface of the main body 30, and holding cylinders 37 are attached to the outer peripheral surface of the main body 30 at predetermined intervals.

Next, a method of press-fitting a pile using the press-fitting device for a pile having the above-described structure will be described with reference to FIG.

When press-fitting the first steel pipe pile P1, a machine is inserted into this steel pipe pile P1 to perform press-fitting while excavating and discharging excavated soil. The second to fifth steel pipe piles P2 to P5 are press-fitted in the same manner, and a steel pipe pile row having an empty inside is constructed.

And when press-fitting the 6th steel pipe pile P6, the 1st steel pipe pile
The compacting machine 3 is inserted into P1 and the excavated soil to be discharged is sent to the compacting machine 3 through the discharging hose 28. Then, the excavated soil is charged into the empty steel pipe pile P1 and is compacted while being filled with the excavated soil. The same applies to the following, and the pile driver 1 moves on the pile, and for the new steel pipe pile Pn, the excavator 2 excavates and discharges the soil in the steel pipe pile, while it becomes an empty existing pile. On the other hand, the compacting machine 3 compacts and fills the excavated soil. Fig. 1 shows the press-fitted state of the seventh steel pipe pile Pn, and the excavated soil is filled in the second steel pipe pile P2 already installed.

In this method of press-fitting a steel pipe pile, since a new steel pipe pile is press-fitted and excavation and earth removal are performed at the tip of the steel pipe pile, the friction resistance of the steel pipe pile is small and the tip resistance is also small. It can be done smoothly and quickly. In addition, since the excavated soil that has been discharged is put into an empty steel pipe pile in the pile row and compacted, there is no need to treat the residual soil.

In the case of the above-described first embodiment, the suction pump 50 is built in the excavator 2, but in the second embodiment shown in FIG. 6, suction and delivery of soil are performed behind the pile driver 1. The trolley 40 was installed, and the suction pump was configured in the trolley 40.

The bogie 40 travels following the movement of the pile driver 1 to ensure the operation of the excavator 2 and the compactor 3. For this reason, the trolley 40 is provided with a suction pump connected to the soil discharge hose 28, a water supply pump connected to the water supply hose 25, and an excavated soil supply mechanism (not shown) such as a cylinder or screw connected to the input hose 32. It is equipped with a tank for temporarily storing excavated soil.

Due to this, the excavated soil excavated by the excavation head 24 and turned into muddy by the water jetted from the nozzle 26 rises in the guide cylinder 27 by the rotation of the auger 23, passes through the soil discharge hose 28, and is carried by the truck.
It is temporarily stored in 40 and is dropped into the already-press-fitted steel pipe pile P2 through the charging hose 32. Therefore, the compacting speed of the excavated soil M by the compacting machine 3 can be adjusted, and it is not always necessary to proceed at the same time as the ground excavating speed by the excavator 2.

4 and 5 show another embodiment of the compacting machine 3, and the same elements as those in FIG. 3 are designated by the same reference numerals. In this embodiment, as shown in FIG. 5 (b), the inside of the steel pipe pile P of the consolidation plate 31 is divided into three equal parts, and three consolidation jacks 38 for vertically moving each consolidation plate 31 are provided. ing. Further, as shown in FIG. 3A, three holding jacks 39 whose tip portions abut against the inner surface of the steel pipe pile P are arranged between the compression jacks 38. The input hose 32 for dropping the excavated soil below the consolidation plate 31 extends through these central portions.

The reference numeral 38a in FIGS. 4 and 5 (b) indicates that the respective compression plates 31 are attached to the corresponding compression jacks 38.
Is a rod extending downward from the. By thus dividing the consolidation plate 31 into three equal parts, it is possible to easily consolidate the excavated soil into the large diameter steel pipe pile. Similarly, the consolidation plate 31 is 2
It may be divided into equal parts or four or more parts, and these equal parts can be appropriately selected according to the pile diameter of the steel pipe pile.

(Effects of the Invention) According to the method of the present invention, since the hard ground at the place where the steel pipe pile is press-fitted is excavated and the soil is excavated, the tip resistance is reduced, and the steel pipe pile can be press-fitted smoothly and quickly. In addition, since the excavated soil is compacted and filled in the existing piles, the residual soil treatment becomes unnecessary,
Eliminates the complexity of construction. Further, according to the apparatus of the present invention, there is an effect that these methods can be performed accurately.

[Brief description of drawings]

Drawing shows an embodiment of the present invention, Fig. 1 is an explanatory view showing a first embodiment of a method for press-fitting a steel pipe pile and its press-fitting device, and Fig. 2 is a sectional view showing an embodiment of an excavator. FIG. 3 (a),
(B) is a cross-sectional view and a plan view showing an embodiment of a compactor,
FIG. 4 is a sectional view showing another embodiment of the compactor, and FIGS. 5 (a) and 5 (b) are lines AA and BB in FIG.
A line sectional view and FIG. 6 are explanatory views of the second embodiment. 1 ... Pile driver, 2 ... Excavator 3 ... Compactor, 20 ... Excavator body 24 ... Excavation head, 28 ... Exhaust hose 30 ... Compactor body, 31 ... Compaction plate 32 ... … Pile hose, M… Excavation soil P, P1 to P6, Pn… Steel pipe pile

Claims (4)

[Claims] 1. A method of excavating soil in a steel pipe pile while press-fitting the steel pipe pile into the ground, press-fitting the steel pipe pile into the ground while discharging the excavated soil from the steel pipe pile, and discharging the discharged soil. A method of press-fitting a steel pipe pile in which the steel pipe is put into a steel pipe pile that has already been press-fitted. 2. A pile driver for press-fitting a steel pipe pile into the ground, an excavator for discharging the ground while excavating the ground, and a compactor for compacting while dropping the soil, and the excavator is the pile driver. It is inserted into the steel pipe pile that is press-fitted into the ground by excavating and discharging the soil in the steel pipe pile, and the compactor is placed in the steel pipe pile that is press-fitted into the ground in the discharged state. A press-fitting device for steel pipe piles that fills the piles with soil. 3. The excavator includes a main body to be inserted into a steel pipe pile to be press-fitted, an excavating means for excavating soil in the steel pipe pile by an excavating blade formed in the main body, and soil excavated by the excavating means. 3. A press-fitting device for a steel pipe pile according to claim 2, further comprising: a soil discharging means for sucking and discharging the steel pipe pile. 4. A main body of the compacting machine, which is vertically movably inserted into a steel pipe pile press-fitted in a state where the soil inside is discharged, and a charging means for charging the soil into the steel pipe pile below the main body. The press-fitting device for a steel pipe pile according to claim 2, further comprising: a compressing plate that compacts the soil charged by the charging means.