JPH0215694B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a device for driving steel pipe piles into the ground such as bedrock or gravel layers.

Conventionally, when driving steel pipe piles into bedrock or a gravel layer, as shown in Fig. 1A, the steel pipe pile A is driven with a vibrohammer C until it reaches bedrock B or a gravel layer, and as shown in Fig. 1B, the steel pipe pile A is driven into the bedrock or gravel layer. A rock excavator D equipped with a rotary cutter or the like at the tip is inserted into A to excavate the rock B or gravel layer below the steel pipe pile A, and a diesel pile hammer E is inserted as shown in Fig. 1C.
Steel pipe pile A was driven into bedrock B or a gravel layer.

Therefore, the conventional construction method requires three types of construction machines, and remains a major problem in terms of construction period and economy.

Furthermore, as shown in Fig. 2, a construction method has been developed in which the lower end of the steel pipe pile A is scoured with a water jet and the steel pipe pile A is directly penetrated with a vibro hammer C, but the target rock is soft rock. However, damage to the tip of the pile becomes a problem.

The present invention was proposed in view of the above circumstances, and consists of a steel pipe pile driving weight having a vertical hole in the center, which is suspended from the body of a pile driving machine so as to be able to rise and fall freely, and a weight of the same weight. The pipe is arranged so as to penetrate the vertical through hole in the weight and extend to the bottom of the steel pipe pile, and is connected to the air pipe for air lift, and is inserted into the vertical through hole in the weight for driving the steel pipe pile. The excavating weight is suspended between the outer periphery of the exit pipe and the inner periphery of the steel pipe pile via an elevating cable, and is capable of being raised and lowered, and is equipped with an excavating blade at the tip. The purpose of this equipment is to drive improved steel pipe piles that can easily and economically drive steel pipe piles into bedrock, gravel layers, etc. with a single machine. The main point is that it provides an embedded device.

In the present invention, as described above, the steel pipe pile driving weight is disposed so as to extend to the lower bottom of the steel pipe pile by penetrating the central vertical hole of the steel pipe pile driving weight suspended from the pile driving machine so as to be able to rise and fall freely. A digging weight having a digging blade at its tip is suspended between the outer periphery of the exit pipe and the steel pipe pile-in periphery via a lifting cable that passes through the central vertical hole, so that it can be raised and lowered. When the excavation weight is lifted to a predetermined height and falls, the same weight slams into the rock at the lower end of the steel pipe pile and breaks it with the excavation blade at the tip. The debris thus crushed by the excavation weight is discharged by an air lift action through the outlet pipe to which air is supplied via the air lift air pipe. On the other hand, the steel pipe piles are driven into crushed rock by hitting the heads of the steel pipe piles with a pile driving weight.

As described above, according to the present invention, driving and digging of steel pipe piles can be performed using a single machine, thereby reducing the construction period and construction cost. Furthermore, according to the present invention, the rock mass at the lower end of the steel pipe pile that has been crushed by the excavation weight is discharged from the outlet pipe by the air lift, so that fresh rock mass can always be effectively excavated. Furthermore, since the outlet pipe acts as a guide for the excavation weight,
The present invention has many advantages, including the ability to perform accurate excavation operations.

The present invention will be described below with reference to the illustrated embodiments.

Reference numeral 1 designates a weight for driving steel pipe piles, which has an annular portion 1b connected to a cylindrical portion 1a and a vertical hole 1c formed in the center thereof. One end of the lifting cable 2 is connected to the annular portion 1b, and the other end is connected to a winch 4 for operating a steel pipe pile driving weight via a pulley 3 mounted on a boom (not shown) of a pile driver. It is wrapped.

Reference numeral 5 denotes an outlet pipe which is passed through the center vertical through hole 1c of the weight 1 and is connected to an air pipe 6 for an air lift.

Reference numeral 7 denotes a weight for excavation, which has a center vertical hole 7a that is loosely fitted into the exit pipe 5, one end of the lifting cable 8 is connected, and the other end is connected to the center vertical hole 7a of the weight 1 for driving steel pipe piles. It passes through the middle of the hole 1c and the exit pipe 5, and is wound around a winch 4' for operating an excavation weight via a pulley 3' mounted on the boom of the pile driver. On the lower end surface of the excavation weight 7, there are a number of excavation blades 9a..., 9.
b..., 9c... are arranged concentrically, and among them, the outermost digging blade 9c is formed into a double edge facing in the circumferential direction, and when the weight 7 falls, it has a diameter larger than the diameter of the weight 7. It is now possible to drill holes.

Then, the steel pipe pile A is erected on the required bedrock B, and the outflow pipe 5 is inserted into the central vertical hole 1a of the steel pipe pile driving weight 1 arranged at the head of the steel pipe pile A. The excavation weight 7, which is extended to the vicinity of the bottom of the steel pipe pile A and loosely fitted into the exit pipe 5, is brought into the steel pipe A (see Fig. 3) and is raised and lowered by the winch 4'. After hoisting the excavating weight 7 to a predetermined height via the cable 8, the same weight 7 is allowed to fall freely, and the rock B is crushed by the excavating blades 9a, 9b, and 9c at the tip of the same weight 7, thus The generated air is discharged through the outlet pipe 5 by an air lift. On the other hand, the winch 4 lifts the steel pipe pile driving weight 1 to a predetermined height via the lifting cable 2, and then allows it to fall freely.The pile head of the steel pipe pile A is struck, and the weight 7 The steel pipe pile A is then penetrated into the crushed bedrock B. (See FIG. 4) Thereafter, the same operations as described above are repeated to penetrate the steel pipe pile A to a predetermined depth.

Note that the steel pipe pile driving weight 1 and the excavation weight 7
Since it is lifted by two winches 4 and 4', the number of blows and the force of each blow can be arbitrarily selected.

FIGS. 10 and 11 show actuating devices for the steel pipe pile driving weight 1 and the excavating weight 7, respectively, in the actuating winch 4 of the weight 1 and the actuating winch 4' of the weight 7. Rotating shafts 11 and 11' supported by bearings 10 and 10' have a drum 12 for winding up the lifting cable 2 of the steel pipe pile driving weight 1 and a drum 12 for winding up the lifting cable 8 of the excavation weight 7. ' are loosely fitted, and clutches 13, 13' are slidably fitted to the rotating shafts 11, 11' via spline joints, and a shifter 15, which is operated via hydraulic cylinders 14, 14'. 15', said clutch 1
3, 13' slide on the rotating shafts 11, 11' to engage and disengage the clutches 16, 16' of the drums 12, 12'.

Gears 17, 17' are fixed to the ends of each of the rotating shafts 11, 11', and a drive wheel 19 driven by a hydraulic motor 18 and both gears 17, 1 are connected to each other.
A chain 21 is endlessly suspended between the gear 20 meshing with the gear 7', and the driving force of the hydraulic motor 18 is transmitted to the two rotating shafts 11 and 11'.

Therefore, the hydraulic motor 18 is driven with the clutches 13, 13' on the rotating shafts 11, 11' connected to the clutches 16, 16' of the drums 12, 12', respectively, by the shifters 15, 15'. In particular, the steel pipe pile driving weight 1 and the excavation weight 7 can be operated at the same time, and the steel pipe pile driving work and the rock excavation work at the inner bottom of the steel pipe pile can be performed simultaneously.

Also, the clutch B on the rotating shaft 11 is connected to the drum 1.
By engaging the clutch 16 of the drum 12 and disengaging the clutch 13' on the rotating shaft 11' from the clutch 16' of the drum 12, the steel pipe pile driving weight 1 alone operates to drive the steel pipe pile. Alternatively, the clutch 13' on the rotating shaft 11' may be engaged with the clutch 16' on the drum 12', and the clutch 13' on the rotating shaft 11 may be engaged with the clutch 16' on the drum 12'.
By disengaging from the second clutch 16, it is possible to operate only the excavation weight 7 independently and perform excavation work on the rock at the bottom of the steel pipe pile.

Incidentally, both winches 4, 4' may be controlled by a microcomputer.

Furthermore, the device of the present invention can also be installed on a work boat.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various ways without departing from the spirit of the present invention. .

[Brief explanation of drawings]

1A to 1C are vertical cross-sectional views showing the steel pipe pile driving process using a conventional steel pipe pile driving device, and FIG. 2 is a vertical cross-sectional view showing the operating state of another embodiment of the conventional steel pipe pile driving device. 3 and 4 are longitudinal sectional views showing a steel pipe pile driving process using the steel pipe pile driving device according to the present invention, FIG. 5 is a front view showing the tip of the steel pipe pile driving device, and FIG. 6 is a bottom view thereof. Figure, 7th
The figure is a slope view of the upper end, Figure 8 is a front view of the elevating device for the steel pipe pile driving weight and excavation weight, Figure 9 is its side view, and Figure 10 is the winch for operating both of the weights. A front view of the part, FIG. 11, is a detailed view of the clutch portion thereof. 1... Weight for driving steel pipe piles, 1c... Vertical hole,
2... Lifting cable, 5... Exit pipe, 6... Air pipe for air lift, 7... Weight for excavation, 8... Lifting cable, 9
a, 9b, 9c...Drilling blade.

Claims (1)

[Scope of Claims] 1. A steel pipe pile driving weight having a vertical through hole in the center, which is suspended from a pile driving machine so as to be able to rise and lower; An exit pipe arranged to extend to the lower bottom and connected to an air pipe for an air lift, and a lifting cable inserted through a vertical hole of the weight for driving steel pipe piles, to the exit pipe. What is claimed is: 1. A steel pipe pile driving device comprising: an excavation weight which is suspended between the outer periphery of the steel pipe pile and the inner periphery of the steel pipe pile in a vertically movable manner, and has a digging blade at its tip. 2. Among the excavating blades attached to the tip of the excavating weight, the excavating blade disposed on the outer periphery is formed into a double-edged blade facing in the circumferential direction. The steel pipe pile driving device according to item 1. 3. A pile driving weight and an excavation weight operating device configured to selectively operate both or either of the lifting cable for the pile driving weight and the lifting cable for the excavation weight. A steel pipe pile driving device according to claim 1, characterized in that: