JPH0130974B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pressure fluid injection device used in a steel pipe pile driving method.

[Conventional technology]

Pressure fluid injection devices used in the conventional steel pipe pile driving method, as typified by the one described in Japanese Patent Publication No. 17646/1982, are used to spray multiple pipes and each end of the pipes. It is equipped with an attached injection nozzle and a pressure fluid supply device connected to a plurality of pipes. An example of its use is to attach a plurality of pipes to a steel pipe pile along the central axis direction of the steel pipe pile, fixedly or removably, and attach a pressure fluid supply device (not shown) to the base end (upper end) of the plurality of pipes. (2) are connected via a hose, and while the pressurized fluid from the pressure fluid supply device is injected from the injection nozzle through the hose and pipe, the steel pipe pile is driven by a steel pipe driving device such as a Monken, auger, or vibratory pile driver. Concrete into the ground.

[Problems to be Solved by the Invention] However, in the above-mentioned pressure fluid injection device, when the pressure fluid is injected from the injection nozzle,
The reaction force causes the pipe to try to escape from the steel pipe pile. To prevent this, in conventional pressure fluid injection devices, the pipe is fixed to a steel pipe pile or detachably attached using a tightening band or the like. For this reason, there are problems such as the pipes and injection nozzles are buried and cannot be used for driving other steel pipe piles, or the pipes are troublesome to install.

An object of the present invention is to provide a pressurized fluid injection device whose pipes and injection nozzles can be used for driving other steel pipe piles, and which can be easily attached to steel pipe piles such as pipes.

[Means for solving problems]

The present invention has a plurality of pipes, an injection nozzle attached to the tip of each of the plurality of pipes, a pressure fluid supply device connected to the plurality of pipes, a plurality of pipes attached, and an opening at the top of a steel pipe pile. It is characterized by comprising a stopper body that is inserted between the end face and the lower face of the steel pipe pile driving device.

[Effect]

The present invention allows the plurality of pipes to be inserted into the steel pipe pile, and the stopper body is sandwiched between the upper open end surface of the steel pipe pile and the lower surface of the steel pipe pile driving device. It is attached to a steel pipe pile via a stopper body that is sandwiched between the open end surface and the lower surface of the steel pipe pile driving device. As a result, it is possible to prevent the pipe from trying to escape from the steel pipe pile due to the reaction force when the pressure fluid is injected.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the pressure fluid injection device used in the steel pipe pile driving method of the present invention will be described with reference to the accompanying drawings.

In the figure, 1 is a steel pipe pile, 2 is a vibrating pile driver, and 3 is a pressure fluid injection device of the present invention.

The vibrating pile driver 2 has a vibrating machine 21 on a pedestal 20.
In addition, a chuck 22 is attached to the bottom surface of the pedestal 20. The top end of the steel pipe pile 1 is clamped by the chuck 22, and a vibrator 21 is driven to apply forced vibration in the vertical direction to the steel pipe pile. Tell 1,
The steel pipe pile 1 is driven into the ground G or pulled out.

The pressure fluid injection device 3 has a short pipe 31 for attachment fixed to the lower surface of two rectangular stopper plates (stopper bodies) 30 whose long sides are longer than the diameter of the steel pipe pile 1.
A ring-shaped loop pipe 32 is fixed to the outer peripheral side of the intermediate portion of the short pipe 31. This loop pipe 3
Two joint pipes 33 are fixed on the top surface of the loop pipe 32 at equal angles (180 degrees), and the upper ends of four water guide pipes 34 are fixed on the bottom surface of the loop pipe 32 at equal angles (90 degrees). It is fixedly installed, and the four water guide pipes 34 are installed downwardly. These four water pipes 34 are connected to the loop pipe 32 at the upper end.
is connected to. Four injection nozzles 35 are respectively attached to the lower ends of the four water guide pipes 34, and retaining rings 36 are fixed to the inner circumferential surfaces of the four water guide pipes 34 at appropriate locations. A hose 41 from a pump 40 serving as pressure fluid supply means is connected to the two joint pipes 33 via a switching valve 42. As described above, the four water guide pipes 34 are attached to the stopper plate 30 via the short pipes 31.

Next, an example of use of the pressure fluid injection device of the present invention configured as described above will be described.

First, the four water guide pipes 34 of the pressure fluid injection device 3 of the present invention are inserted into the steel pipe pile 1 and arranged in the central axis direction of the steel pipe pile 1, and the stopper plate 30 is placed on the upper end of the steel pipe pile 1. (see Figure 6). Next, the steel pipe pile 1 is
while holding the top end of the stopper plate 30.
The lower surface of the pedestal 20 is brought into contact with the upper surface, and the stopper plate 30 is sandwiched between the pedestal 20 and the steel pipe pile 1 (see FIG. 5). In this way, the pressurized fluid injection device 3 of the present invention can be easily and removably attached to the steel pipe pile 1.

Then, the exciter 21 is driven and the pump 40 is activated. Then, the vertical forced vibration generated in the exciter 21 is transmitted to the steel pipe pile 1, while the pressure water from the pump 40 is transmitted to the hose 4.
1. The steel pipe pile 1 is driven into the ground G while being injected downward from the four injection nozzles 35 through the joint pipe 33, the loop pipe 32, and the four water guide pipes 34, respectively. At this time, since pressurized water is injected from the injection nozzle 35 inside the steel pipe pile 1, the earth and sand inside the steel pipe pile 1 can be actively discharged to the ground surface, and therefore the steel pipe pile 1 can be driven quickly. This improves pouring efficiency.
Moreover, the ground G outside the steel pipe pile 1 is not disturbed, and even if it is disturbed, the disturbance is small.
Therefore, sufficient supporting force can be obtained for the driven steel pipe pile 1. Furthermore, since the water guide pipe 34 of the pressure fluid supply means 3 and the like are arranged inside the steel pipe pile 1, even if a joint for connecting and driving the steel pipe pile 1 is provided on the outside of the steel pipe pile 1, Even if there is a problem, there are no restrictions on the position or place where the water guide pipe 34 or the like is installed.

Furthermore, in the pressurized fluid injection device used in the steel pipe pile driving method of the present invention in this embodiment, the four water guide pipes 34 are connected to each other through the loop pipes 32, so that the pressurized water from the pump 40 is transferred to the loop pipes 32. The water is divided into four water guide pipes 34, and is then injected from four injection nozzles 35 at approximately the same amount and pressure. Therefore, the soil inside the steel pipe pile 1 can be discharged almost evenly and evenly without scattering, and the soil inside the steel pipe pile 1
can be cast with high precision.

In particular, in this embodiment, when pressurized water is injected from the injection nozzle 35, the upward direction (direction opposite to the driving direction of the steel pipe pile 1) due to the injection of the pressure water
The reaction force acts, and the pressure fluid injection device 3 hits the steel pipe pile 1.
However, since the stopper plate 30 of the pressure fluid injection device 3 of the present invention is sandwiched between the top end of the steel pipe pile 1 and the mount 20 of the vibratory pile driver 2, the pressure fluid injection device 3 There is no way to get out of steel pipe pile 1. Therefore, there is no need to fix the pipe to the steel pipe pile 1 or to attach it removably with a tightening belt.

Further, in this embodiment, the four water guide pipes 34 are connected to the loop pipe 32 at their top ends, but other water guide pipes 34 may be connected to the loop pipe 32 at the middle or lower end. However, it is sufficient if the four water guide pipes 34 are communicated through the loop pipe 32.

Furthermore, the fluid used for injection, the water guide pipe 34
The number of rings 36 holding the water guide pipes 34 and the fixing locations thereof are not limited to the above-mentioned embodiments.

〔Effect of the invention〕

As is clear from the above, the fluid pressure injection device used in the steel pipe pile driving method of the present invention has a plurality of pipes each equipped with an injection nozzle attached to the stopper body, so it is easy to insert the plurality of pipes into the steel pipe pile. By inserting the stopper body between the upper opening end face of the steel pipe pile and the lower face of the steel pipe pile driving equipment, the multiple pipes can be inserted between the upper opening end face of the steel pipe pile and the lower face of the steel pipe pile driving equipment. It is attached to the steel pipe pile via the stopper body sandwiched between. As a result, it is possible to prevent the pipe from trying to escape from the steel pipe pile due to the reaction force when the pressure fluid is injected. Therefore, a plurality of pipes and injection nozzles can be removably and easily attached to a steel pipe pile, and can be used for driving other steel pipe piles.

[Brief explanation of drawings]

The accompanying drawings show an embodiment of the pressure fluid injection device of the present invention, and FIG. 1 is a plan view, FIG. 2 is a front view, FIG. 3 is a side view, and FIG. 4 is a view of the pressure fluid injection device of the present invention. A partial front view of the pipe installed on a steel pipe pile, Figure 5 is an explanatory diagram showing the construction state of the steel pipe pile driving method using the pressure fluid injection device of the present invention, and Figure 6 is a partial front view of the pipe installed in the steel pipe pile. It is an explanatory view showing a state where a stopper plate is placed on the upper opening end surface of a steel pipe pile. 1... Steel pipe pile, 2... Vibrating pile driver, 20... Frame, 21... Vibrator, 22... Chack, 3...
Pressure fluid injection device, 30... stopper plate (stopper body), 32... loop pipe, 34... pipe,
35...Injection nozzle.

Claims (1)

[Claims] 1 Attach multiple pipes, injection nozzles attached to the tips of the multiple pipes, a pressure fluid supply device connected to the multiple pipes, and multiple pipes, and connect the upper opening end surface of the steel pipe pile with the steel pipe. A pressurized fluid injection device used in a steel pipe pile driving method, characterized by comprising a stopper body that is inserted between the bottom surface of the pile driving device and the bottom surface of the pile driving device.