JP2767029B2 - Pile press-fitting method using water jet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for driving steel piles while jetting jet water onto the ground, and more particularly to a method having an automatic water flow adjusting system for interlocking jet water jetting and driving piles.

[0002]

2. Description of the Related Art Conventionally, when a steel pile is driven into the ground using a water jet, jet water is constantly jetted out during construction.

[0003]

As described above, when water is constantly jetted, 700 liters per minute or 12 liters per minute is required.
A large volume of 50 liters of water continues to erupt. Therefore, it was necessary to secure a large amount of water even when hitting a single pile. In addition, there is a problem that the water enters the soil and exerts an influence on the nearby ground, pollution of rivers, and environmental pollution such as groundwater pollution are extremely large.

[0004]

Means for Solving the Problems The present invention is a construction method for solving the above-mentioned problems. The gist of the present invention is to set a press-fitting tonnage, a pile length and a press-fitting stroke of a press-fitting pile in advance, and Turning on the jet nozzle attached to the lower end and performing injection with the minimum amount of water while lowering the chuck to press-fit the pile.Detecting whether or not the press-in has been completed When the press-fitting stroke is released and the step of lifting the pinch is not completed, the press-fitting stroke of the pile is detected by the stroke sensor, and compared with the press-fitting stroke set in advance, if it is determined that there is no need to add, When the press-fitting tonnage is equal to or less than the preset press-fitting tonnage by adding the pressurizing stroke to the step of increasing the water amount and press-fitting again, and if The step of reducing the amount of water from the nozzle and press-fitting it again, and when the pressure is equal to or greater than the set press-fitting tonnage, increasing the amount of water from the jet nozzle and performing press-fitting again. The required amount of water is minimized by interlocking the pile press-in / pull-out machine and the jet water injection device, thereby minimizing the adverse effects on the surrounding environment and the underground, and excelling in economy and environmental protection. It is an object of the present invention to provide a pile press-in method capable of performing construction in an appropriate manner.

[0005]

FIG. 1 shows an entire configuration of a pile press-in / pull-out apparatus according to an embodiment of the present invention. The pile press-in / pull-out device includes a pile press-in / pull-out machine 1 for driving a pile such as a steel sheet pile, and a power unit that supplies power to the pile press-in / pull-out machine 1. The pile press-in / pull-out machine 1 presses the pile P into the ground and moves on the pressed pile P. Then, along with this movement, a new pile P1 is pressed into the ground. The pile press-in / pull-out machine 1 is attached to the clamp 5 hanging down from the saddle 4 to clamp the pile P, a mast 6 standing on the saddle 4 via a slide base, and a vertically movable front side of the mast 6. Lifting body 7
And a main cylinder 8 for vertically moving the elevating body 7, and a chuck 9 attached to the elevating body 7. The chuck 9 clamps the new pile P1, and presses the new pile P1 into the ground as it descends. Pile press-in and pull-out machine 1 of this structure
Can use a conventional pile press-in and pull-out machine as it is.

[0006] When the pile is pressed in by the pile press-in / pull-out machine 1, jet water is jetted to the ground. For this reason, the jet nozzle 1 for jetting jet water is added to the new pile P1.
0 is attached by a nozzle socket (not shown). In this case, a metal band or the like is used for the nozzle socket, and the jet nozzle 10 is attached by welding the metal band to the pile P1 while sandwiching the jet nozzle 10 between the metal band and the pile P1. Will be The jet nozzle 10 has a hose 11 and a reel 33
And the power unit 2 via a hose 12,
Jet water is supplied from the unit 2.

The power unit 2 has a box shape and includes a drive unit 21 and a jet unit 2.
2 and three compartments accommodating the water tank 23. Further, although not shown, a control device is provided for controlling the press-fitting state of the pile P by the pile press-in / pull-out machine 1 in conjunction with the jet water injection device. The drive unit 21 supplies power to the pile press-in / pull-out machine 1 and the jet unit 22, and has an engine 24 and a hydraulic pump 25 connected to the engine 24 and operating. The pressurized oil from the hydraulic pump 25 is supplied to the clamp 5, the chuck 9, and the main cylinder 8 of the pile press-in / pull-out machine 1 to operate them and slide the slide base. This pressure oil is also supplied to the hydraulic motor 26 of the jet unit 22.

The jet unit 22 includes a hydraulic motor 26
And a jet pump 27 that is connected to the hydraulic motor 26 and operates to generate jet water. The hose 12 is connected to the jet pump 27, and the generated jet water is supplied to the hose 12, the reel 33 and the hose 1.
1 and is supplied to the jet nozzle 10. Here, the hydraulic motor 26 of the jet unit 22 operates by being connected to the hydraulic pump 25 of the drive unit 21. Thus, the jet unit 22 does not require an engine for its operation. That is, in the above configuration,
Drive unit 21 for generating power of pile press-in / pull-out machine 1
However, the power is distributed as power for generating jet water. For this reason, since the system of the pile press-in / draw-out machine 1 and the system of the jet water are combined into one system, these can be centrally monitored. Therefore, power management becomes easy and the number of workers for monitoring can be reduced. The jet amount and jet pressure of the jet water are adjusted by the rotation speed of the jet pump 27. The jet pump 27 is driven by the hydraulic pump 25 of the drive unit 21 through the hydraulic motor 26, 25
, You can adjust and manage the jet water,
It is also possible to reduce the amount of water used. When the jet water is not used, all of the output of the hydraulic pump 25 is switched as the power of the pile press-in / pull-out machine 1.

The water tank 23 is supplied with water from a water source 30 and stored therein. Therefore, the water absorption pump 29 is immersed in the water source 30, and the water is supplied to the water tank 23. In the present embodiment, as described above, since the amount of jet water can be controlled and reduced, the amount of water stored in the water tank 23 may be small, and the water tank 23 can be incorporated in the power unit 2. is there.

The above-mentioned power unit 2 is mounted on a moving vehicle traveling on the ground. In the illustrated example, a crawler 28 is used as a mobile vehicle, and the crawler 28 moves following the movement of the pile press-in / pull-out machine 1 accompanying the pile press-in / pull-out. As a result, the power unit 2 as a whole is
As a result, the drive unit 21 for driving the pile press-in / pull-out machine 1 and the jet unit 22 for generating jet water integrally move. Such a structure eliminates the need for external materials such as cranes for movement,
The movement can be easily performed, and the movement can be quickly and labor-saving.

The reel 3 is mounted on the mast 6 of the pile press-in / draw-out machine 1.
3 is attached. A hose 11 connected to the jet nozzle 10 is wound around the reel 33, and the hose 11 is wound up or pulled out by forward and reverse rotation.
The rotation of the reel 33 is performed by a take-up motor 34 composed of a hydraulic motor provided coaxially with the reel 33. By winding the long hose 11 with the reel 33 in this manner, the hose 11 is not scattered on the site and is not disordered.

Next, the pile P1 in the embodiment of the present invention
The operation of press-fitting will be described with reference to the flowchart of FIG. The following is the description of the press-in process of one cylinder stroke
It is clear and this process is repeated to insert one pile
Because When the device is started, first, a new pile P1 is provided to a control device (not shown) built in the power unit 2.
Enter the number of press-ton, followed you input the length and pressure Nyusu Torrox <br/> click the pile. The pile P1 is clamped by the chuck 9 of the pile press-in / draw-out machine 1, and the jet nozzle 10 is set at the lower end thereof. Then, the jet from the jet nozzle 10
The chuck 9 is lowered to press-fit the pile P1 while the water injection is automatically turned on and the injection is performed with the minimum amount of water (step ( 1 )). If the press-fitting cannot be performed smoothly, this information is fed back to the control device, the water volume is increased, and the press-fitting is performed again.

In step ( 2 ), it is detected whether or not the press-fitting has been completed. If YES, the injection from the jet nozzle 10 is stopped. However, as described below, a very small amount of water is jetted from the jet nozzle 10 so as not to cause clogging with earth and sand. Then, in preparation for the next press-fitting, the chuck 9 releases the holding of the pile P1 and moves upward.

The pile P1 is press-fitted by repeating this process. In this press-fitting process, since the pile press-in / pull-out machine 1 and the jet pump 27 communicate with each other and work together, the amount of water and the water pressure from the jet nozzle 10 are: It is automatically adjusted to the required minimum water volume and water pressure based on the set injection tonnage. That is, the required amount of water is injected only when the pile press-in / pull-out machine 1 is press-fitting, and otherwise, a very small amount of water may be injected so that the nozzle 10 is not clogged by earth and sand. Therefore, a small amount of water can be used, and it is easy to secure water. In addition, the labor for the pile press-in operation can be saved, and the device can be made compact and the site environment can be improved.

If the press-fitting is not completed in step ( 2 ), the process proceeds to step ( 3 ). In this step ( 3 ), the press-in stroke of the pile P1 is detected by a stroke sensor built in the pile press-in / pull-out machine 1, and it is checked whether or not it is necessary to add the stroke to the initially set press-in stroke. If it is determined that it is not necessary to add the information, the information is fed back, the amount of water is increased and the water is injected again.
If the press-fit stroke is to be increased, the process proceeds to step ( 4 ), where the press-fit tonnage is compared with the initially set press-fit tonnage. If it is less than the set press-fitting tonnage, press-fitting is performed by reducing the amount of water from the jet nozzle 10, and the process proceeds to the above step ( 2 ). If the tonnage is equal to or greater than the set press-fitting tonnage, the amount of water from the jet nozzle 10 is increased, and the process is fed back to the step ( 2 ).

As described above, in the present apparatus, the pile press-in and pull-out machine 1
Is controlled by a stroke sensor. Therefore, even at the time of press-fitting, the jet nozzle 10 does not spray at the place where the pile has already been press-fitted. In other words, it is possible to prevent the jet nozzle 10 from jetting only at the part where the pile is newly press-fitted, thereby further saving water and improving economic efficiency.

The relationship between the press-fit state of the pile P and the jet water jet will be described with reference to FIG. When the chuck 9 is open, that is, when the pile P1 is not press-fitted, jet water is not injected (FIG. 2A). Raise the chuck 9 and pile P1
Jet water is not sprayed when pulling
(B)). Even at the time of press-fitting, since the stroke of the pile press-in and pull-out is detected by the stroke sensor, the pile P
In the space B generated at the place where the pressure 1 is inserted, the tip of the pile P is C
Jet water is not injected until the point (Fig. 2
(B), (c)). When the chuck 9 is closed and lowered to exceed the point C, jet water is jetted for the first time (FIG. 2D). The ejection amount is, for example, about 300 liters per minute. In this way, the present device injects jet water only when necessary. Further, when the press-fitting tonnage is small, the amount of water decreases, and when it increases, the amount of water is automatically increased.

In addition, jet water is not used in the surface layer having a low press-fitting tonnage in principle. Further, even when jet water is used, the amount of water for jet jet is small, so that no drainage treatment is required.

[0019]

As described above, according to the present invention, the pile press-in / pull-out machine and the jet water injection device are controlled in conjunction with each other, and the jet water is automatically adjusted to the required minimum water amount and water pressure.
The amount of water required for press-fitting the stakes was kept to a minimum. As a result, a small amount of water is required, water is easily secured, adverse effects on the surrounding environment and the ground are minimized, and construction with excellent economic efficiency and environmental protection is enabled. In addition, there is an effect that labor saving of pile press-in operation can be achieved.

[Brief description of the drawings]

FIG. 1 is a side view of the overall configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a relationship between a press-fit state of a pile and jet water jetting.

FIG. 3 is a flowchart for explaining an operation of press-fitting a pile.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pile press-in / draw-out machine 2 Power unit 10 Jet nozzle P, P1 Pile

Claims (1)

(57) [Claims] 1. A method for setting a press-fitting tonnage, a pile length, and a press-fitting stroke of a pile to be press-fitted, turning on a jet nozzle attached to a lower end of the pile, performing jetting with a minimum amount of water, and lowering a chuck to lower the pile. Press-fitting, detecting whether or not the press-fitting has been completed, and lifting the chuck by releasing the pinching of the pile when completed.If the press-fitting is not completed, the press-fitting stroke of the pile When it is detected by the stroke sensor and it is determined that it is not necessary to add the pressure to the preset press-fit stroke, the water amount is increased and press-fit is performed again. If it is less than the set press-fit tonnage, the amount of water from the jet nozzle is reduced and press-fitting is performed again. Combined with pile press-fit method a water jet which is characterized in that the amount of water is up to press-fit again from Ttonozuru.