JPS60230430A - Pile driving method - Google Patents

Abstract

PURPOSE:To excavate a ground by the use of injected water and to drive a pile under gravity, by a method wherein an injection nozzle is formed in the forward end of a hollow pile, and a cap is attached in a watertight structured manner to the upper end thereof, and water is fed with pressure in the hollow pile to inject the water through the injection nozzle. CONSTITUTION:A cap 4 is attached in a watertight structured manner to the upper end of a hollow pile 1 provided at its forward end with an injection hole, and water is fed with pressure in the hollow pile 1 through a water feed port 5 with the aid of a pump 11. In which case, water fed with pressure is discharged through an injection nozzle 3 to produce injection water by means of which a ground is excavated. In this case, the hollow pile 1 enters an excavated hole 13 under gravity, and excavation by means of injection water is progressed simultaneously with driving of the hollow pile 1. Water injected through the injection hole 3 and excavated soil are raised along the outer peripheral part of the hollow pile 1, and flow in a soil containing tank 10 through a discharge port 7 by means of a pipe 8, and after water is separated from soil, the water is re-used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a pile driving method, particularly to a method for driving piles for foundation construction with low vibration and low noise.

[Prior art]

The hammering method was mainly used to drive prefabricated piles, such as concrete piles, as the foundations of structures because of its superior construction efficiency and reliable bearing capacity, but in recent years vibration and noise during construction will be regulated. Along with this, low-vibration and low-noise methods such as the hollow digging method and the pre-poling method have come to be widely used. However, these construction methods had the problem that construction was difficult because, for example, pre-boring was performed, the poling machine was removed from the excavated hole, the pile was then placed in the excavated hole, and cement milk was poured in and solidified.

[Purpose of the invention]

In view of the above circumstances, it is an object of the present invention to solve the above problems by providing a pile driving method that is easy to construct and is more effective in terms of low vibration and low noise.

[Summary of the invention]

The features of the present invention include a hollow pile with an injection hole at its tip, a guide pipe provided on the ground side, a cap provided with a watertight structure on the upper end of the hollow pile, and a pipe connecting this cap and the guide pipe. and a pump installed in the pipe, and when the pump operates, water is forced into the hollow pile and injected from the injection hole, and the jetted water is circulated through the pipe to the hollow pile, and the jetted water is used to ground the ground. While excavating the pile, the pile is driven into the excavated hole using its own weight, and excavation using jet water and pile driving using the pile's own weight can proceed at the same time, and construction is simple and promotes low vibration and low rIA noise.

[Embodiments of the invention]

In FIG. 1, 1 is a hollow pile formed with a water guide hole 2 whose tip is closed and whose upper end is open on the axis -1-, and is a reinforced concrete pile, a PC pile, a steel pile,
Or they are made of composite piles, etc.

Furthermore, a plurality of injection holes 3 are formed at the tip of the pile 1 so as to face downward. Further, a cap 4 is removably attached to the end of the pile 1 with a watertight structure, and a water supply port 5 is provided in the gap 4.

Reference numeral 6 denotes a guide (c) installed on the ground surface, and a water outlet 7 is provided at a position above the ground surface. 8 is a pipe that communicates and connects the water discharge lower of the guide pipe 6 and the water supply [ ] 5 of the cap 4, and an earth and sand storage tank 10 that separates the excavated earth and sand 9 is connected in the middle, and the earth and sand storage tank 1
A pump 11 is interposed between the water supply port 5 of the cap 4 and the water supply port 5 of the cap 4.

First, the guide pipe 6 is installed on the ground surface as shown in Fig. 2, and then the pipe 8 and the earth and sand storage tank 1 are installed as shown in Fig. 3.
0, the pump 11 and the cap 4 are connected, and the cap 4 is attached to the pile 1, and the pile 1 is supported by a dowel or the like (not shown).

In that case, the guide pipe 6 may be installed after digging the floor. Further, the tank 10 and the circuit contain or are filled with a liquid such as water 12 or a chemical solution.

When the pump 11 is operated, the water 12 is supplied under pressure through the pipe 8 from the cap 4 into the water introduction hole 2 of the pile 1, and is injected from the injection hole 3 at the tip as jet water to excavate the ground. The earth and sand 9 are broken up by the jetted water 12, and the broken earth and sand 9 are moved upward along the outer periphery of the pile 1 along with the water 12.
This flows from the discharge 07 of the flow guide pipe 6 through the pipe 8 into the earth and sand storage tank 10, and inside the tank 10, the earth and sand 9 is separated from the water 12, and the water 12 passes through the pipe 8 and enters the cap 4,
Circulates into pile 1.

In that case, the jet water may be jetted in a whirlpool by forming the jet holes 3 in an oblique direction.

In this way, the ground is excavated by the jet of water 12 circulating in the circuit, and the pile 1 is driven into the ground by its own weight into the excavated hole 13. The driving of the pile 10 proceeds at the same time, and the jet water circulates.

In this way, when the driving reaches a predetermined depth as shown in FIG. Cement milk 14 in 1 and drilled hole 13
is injected and solidified. Although the guide tube 6 is shown as having a flange on one side to close off the space between it and the pile 1, it may be open without having a flange.

〔Effect of the invention〕

The present invention comprises a guide pipe having an injection hole at its tip, a cap provided with a watertight structure at one end of the hollow pile, a vibrator connecting this gap and the guide pipe, and a pump provided on the pipe. The water is pumped into the hollow pile by the operation of the pump and is injected from the injection hole.
The jetted water is circulated through the pipe to the hollow pile, and the ground is excavated with the jetted water while the pile is driven into the excavated hole using its own weight. Therefore, excavation using the jetted water and driving of the pile using its own weight proceed simultaneously. Therefore, construction can be carried out simply and efficiently, and there is no need to worry about the noise and vibration of conventional boring machines, and the piles are driven in with natural force as they are excavated, resulting in very low noise and vibration. In addition, cement milk can be injected using the Pyle no water conduit hole and the injection hole.[Since the injected drilling water or groundwater continues to circulate within the circuit, there is no need to keep supplying new water, making it economical. is big.

[Brief explanation of drawings]

Fig. 1 is an overall sectional view, and Figs. 2 to 6 are sectional views showing the pile driving process. 1.Hollow pile 3.Injection hole 4.Cap 6.
・Guide tube 8... Vibrator 11... Pump JP-A Sho GO-230430 (4) IN5 figure JP-A Sho GO-230430 (7) Fig. 6

Claims (1)

[Claims] A hollow pile with an injection hole provided at the tip, a guide pipe provided on the ground surface side, a cap provided with a watertight structure at the upper end of the hollow pile, a pipe connecting the cap and the guide pipe, and a pipe provided on the pipe. The water is pumped into the hollow pile by the operation of the pump, and is injected from the injection hole, and the injected water is circulated through the pipe to the hollow pile, and the ground is excavated with the injected water. A pile driving method characterized by driving piles into excavated holes using their own weight.