JPH0368967B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a ground penetrating machine, particularly a pile press-in machine, in particular a pile press-fitting machine that grips a pile to be press-fitted with a chug and press-fits it into the ground by applying a static push-down load. The present invention relates to a ground penetrating machine that can be used in conjunction with a static load type pile construction machine (hereinafter referred to as a static load type pile construction machine) to improve the usefulness of this type of static load type pile construction machine for the purpose described below.

Conventional technology A static load type pile construction machine can construct piles without noise or vibration, and there is no damage or deformation of the pile head. However, there was a problem in that a push-down load was applied to the pile through a chuck that gripped it at an above-ground location, or in other words, a press-fitting load was applied to the pile at an above-ground location. In other words, when press-fitting a pile, the press-fitting resistance is the pile tip resistance, peripheral surface resistance,
In this respect, applying a press-fit load at the above-ground part of the pile will result in a large loss of force due to these resistances, and the press-fit load will be transmitted to the tip of the pile in a reduced manner. Therefore, it is not necessarily useful. In fact, with a static load type pile construction machine, if there is an obstacle layer such as boulders or gravel in the ground, it becomes difficult or impossible to press the pile into the pile. If you force the pile into the pile,
This may cause deformation or damage to the pile tip, or worsen the directionality of the pile, resulting in pile collapse, increased section resistance, etc., and subsequent pile construction becomes impossible.

However, the reality is that no effective countermeasures have been established to solve the aforementioned problems of static load type pile construction machines.

Conventionally, in pile construction using a static load type pile construction machine, in order to assist in the press-in of piles, it has been dependent on excavation by jet water injection or a combination of excavation with an earth auger. According to this, the ground is excavated at the tip of the pile at the same time as the pile is press-fitted, that is, the digging means is additionally installed at the tip of the pile, so the effect of the pile press-in itself is improved, but the former In the latter case, the ground is loosened due to water penetration, and the hole drilled by the auger is too large. It is difficult to do so, and the combined use of a jet-injection excavator and an earth auger as the additional press-in auxiliary means inevitably increases the size of the entire static load type pile construction machine considerably. Thus, the previously known construction methods cannot effectively solve the above-mentioned problems of static load type pile construction machines.

Furthermore, conventionally, an auxiliary excavation blade is attached to the casing of the earth auger by being positioned at the tip of the pile, and the blade is operated while the pile is inserted into the ground while the earth auger excavates the ground. Extending the borehole (Tokukosho)
54-3522) is also known. However, in this conventional technology, the auxiliary excavation blade is kept on standby on the ground for strata that do not require auxiliary excavation, and the tip of the pile must be able to break through obstacles such as boulders and gravel in the ground. It cannot be simply done to apply the auxiliary digging blade only when it is absolutely necessary. That is, in order to operate the auxiliary excavation blade in this way, it is necessary to insert the casing into the ground, but since the casing does not have the ability to dig into the ground, the earth auger is first pulled out to the ground and inserted into the ground together with the casing. It has to be inserted again, and the work efficiency of pulling it out and reinserting it is extremely poor. It's also not efficient.

It is an object of the present invention to solve the aforementioned problems of the former two conventional techniques, and to provide a geological formation in which piles can be press-fitted only by the chuck of a static load type pile construction machine, that is, by applying a press-in load by a conventional method. A ground penetrating machine as an auxiliary excavation device that can be kept on standby on the ground and used to easily break through obstacles such as boulders and gravel in the ground when the tip of the pile encounters them. to develop.

Means for Solving the Problems In order to achieve the above object, a ground penetrating machine according to the present invention is connected to the lower end of a pile to be press-fitted, which is gripped by a chuck in a pile press-fitting machine and subjected to a static downward load. a body; a tightening means attached to the body for releasably tightening the body to the lower end of the pile; It has a combination configuration of a ground penetrating blade that is equipped with a vertically movable ground penetrating blade, and a drive machine that is attached to the main body and drives the blade,
The combination of the main body with tightening means, the blade, and the driving machine is characterized in that it is formed in a shape that can be pulled out to the ground and inserted into the ground when combined with the pile.

In the present invention, the main body of the above-mentioned penetrating machine is tightly connected to the lower end of the pile to be press-fitted by its tightening means, so that the main body is integrated with the pile to be press-fitted, and under this connection, the ground penetrating blade is The tip will be located below the bottom end of the pile. Therefore, after the main body is connected, the pile to be press-fitted is grasped by the chuck of the static load type pile construction machine, or the pile to be press-fitted is grasped by the chuck of the static load type pile construction machine and the main body is connected to this, and the main body is connected to the chuck. The pile to be press-fitted is press-fitted by applying a static push-down load, and the blade is pushed down against the press-fitted pile by the driving machine of the ground-penetrating blade, so that the blade is inserted into the ground prior to press-fitting the pile. It can be penetrated. The preliminary penetration of the blade into the ground can be advanced by repeating the operation of returning the blade to its original position with a drive machine and pushing it down again when it reaches its limit of pushing down against the press-fit pile. The advance penetration of the ground by the blade perforates the ground below the pile tip and contributes to assisting the pile press-in.

Pre-penetration of the ground by the blade described above can be carried out simultaneously during pile construction by maintaining the connection of the intruder main body to the lower end of the pile. If the pile is returned to the area where the pile was pulled out, or if the main tension stage is loosened and the main body of the intruder is uncoupled, and the intruder is pulled out to the ground using the wire rope connected to the intruder in advance, press-fitting of only the pile can be carried out. The invented penetration machine will be suspended. Resuming the advance penetration of the ground by the blade can be carried out by once pulling out the pile, reconnecting the penetrating machine body thereto, and inserting the pile into the ground where the pile was pulled out.

Effects of the Invention As described above, according to the present invention, the pile press-in is assisted by the advance penetration of the ground by the leading blade, so the pile can be press-fitted in the same firm state as if it were press-fitted alone. According to the construction of the present invention, the scale of maintenance required for pile press-in assistance can be reduced compared to the conventional method. Therefore, the present invention can successfully solve the above-mentioned problems of static load type pile construction machines.

Furthermore, in the present invention, a ground penetrating machine as an auxiliary excavation device has a combination configuration of a main body with a tightening means coupled to the lower end of the press-fitted pile, a ground penetrating blade provided on the main body, and a driving machine thereof,
The combination of these components is formed in a form that can be pulled out to the ground and inserted into the ground when combined with the pile. For ground where piles can be press-fitted under load, they are kept on standby above the ground, and when the tip of the pile encounters an obstacle such as a boulder or gravel in the ground, a structure is placed in the ground to allow the pile to break through to that location. It can be easily inserted and applied. That is, the workability and efficiency of inserting the above-mentioned combination into the ground is much better than when the earth auger is once pulled out and reinserted together with the casing. Furthermore, even if the pile is pulled out and reinserted into the area where the pile was pulled out, the workability and efficiency are sufficiently improved compared to pulling out the earth auger and reinserting the auger together with the casing.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 to 8, and in FIGS. 1, 2, and 3, 1 is a ground penetrating machine, and the penetrating machine 1 is a static load type pile construction machine 2, which is known per se.
The main body 5 is connected to the press-fit pile 4 which is gripped by the chuck 3 in FIG. It has a clamp 6. The clamp 6 is driven by a drive machine, for example, a hydraulic drive machine such as a hydraulic cylinder/plunger device 7 or a drive machine such as an electric screw jack. Tighten pile 4 between. When the clamp 6 is loosened by the hydraulic cylinder plunger device 7, the tightening is released. The hydraulic cylinder plunger device 7 is pivotally connected to the clamp 6 at one end and to the main body 5 at the other end.

The main body 5 is equipped with a ground penetrating blade 10 having a chisel attached to its tip, more preferably a chisel 9 removably attached so as to be movable up and down, and a driving machine for driving the blade 10, such as a hydraulic cylinder plunger device 11, etc. Equipped with a drive machine such as a fluid pressure drive machine or an electric screw jack. The tip of the blade 10 is located below the lower end of the pile 4 when the main body 5 is connected to the lower end of the pile 4. The hydraulic cylinder plunger device 11 is connected to the main body 5 at one end and pivotally connected to the ground penetrating blade 10 at the other end. 1
2 and 12 are guide rails formed on both left and right sides at the lower end of the main body 5;
The left and right ear portions of the upper half side portion 10a of the ground penetrating blade 10 are fitted into the ground penetrating blade 10 so as to be vertically movable. 13... is a clamp of the static load type pile construction machine 2.

The combination of the main body 5 with tightening means, the penetrating blade 7, and the driving machine 8 is formed in a shape that can be pulled out to the ground and inserted into the ground when combined with the pile 4, as shown in the figure. .

Another embodiment of the present invention is shown in FIGS. 4 and 5, in which the same reference numerals as in FIGS. 1 to 3 indicate the same parts. The one shown in Figs. 4 and 5 has two hydraulic cylinder/plunger devices 11 on the left and right, and the ground penetrating blade 10 is connected to the guide rails 12, 12 in Figs. 1 to 3.
Figures 1 to 3 except that the vertical movement guide of
It has the same configuration as the embodiment shown in the figure.

The ground penetrating blade 10 may be of the type shown in FIGS. 6 and 7 in addition to the types shown in FIGS. 1 to 5.

8 and 9 show examples of changes to the tightening means. In FIGS. 8 and 9, the same reference numerals as in FIGS. 1 to 3 indicate the same parts. By pulling the wire rope 19 connected to the rear end of the eccentric claw type clamp 18 upward, the eccentric claw type clamp 18 is rotated clockwise in FIG. guide pulley 2
By pulling the wire rope 21 connected through the wire upward, the clamp 18 is turned in the opposite direction to release the clamp.

The pile press-in is assisted by the ground penetrating machine of the present invention in the above example as follows.

An already press-fit pile a is grasped with a clamp 13, and a chuck 3 of a static load type pile construction machine 2, which is made to stand up on top of the pile a, is grasped by a chuck 3 of the press-fit pile 4, and a penetrating machine main body 5 is attached to the lower end of the pile 4. are tightened using clamps 6 or 18.

In this state, a static downward load is applied to the chuck 3 to press the pile 4 into the ground, and at the same time as the pile construction or when necessary, the ground penetrating blade 10 is inserted into the pile 4 using the hydraulic cylinder/plunger device 11. When the blade 10 is pressed down, the blade 10 penetrates into the ground in advance and perforates the ground below the tip of the pile 4, thereby assisting the press-fitting of the pile 4.

During the construction of the pile 4, if the penetrating machine 1 is pulled out to the ground together with the pile 4, or if the main body 5 is uncoupled from the pile 4 and the penetrating machine 1 is pulled out to the ground, the penetrating machine 1 becomes non-operational. It is possible to perform construction only by press-fitting the laid pile 4. In order to re-assist the press-in of the pile 4 by the preliminary penetration of the ground-penetrating blade 10, it is sufficient to once pull out the pile 4, reconnect the penetrating machine body 5 to it, and return the pile 4 to the ground where it was pulled out.

Note that as the static load type pile construction machine 2, one having the following configuration can be used.

A chuck 3 for gripping the press-fitted pile 4 is arranged adjacent to a clamp 13 for gripping the already press-fitted pile a, and the chuck 3 is connected between the clamp 13 and the clamp 13 by appropriate means to perform relative vertical movement and to move the pile. a... It is possible to drive the piles back and forth relative to the parallel direction in a direction greater than the pile parallel pitch, and furthermore, by appropriate means, the pile a... can be linearly traversed or turned in a direction transverse to the parallel direction with respect to the clamp 13... has been done. More preferably, in addition to this configuration, the chuck 3 is rotatably displaceable by more than 180 DEG in a direction around its vertical axis. Such a required drive or rotational displacement of the chuck 3 may be effected by a hydraulic cylinder/plunger device or a hydraulic motor, which are known per se.

In the static load type pile construction machine 2 shown in FIG.
One end of the hydraulic cylinder plunger device is connected to the main body of the chuck 3, and the other end is connected, preferably pivotably connected, to a mast 15 that can pivot horizontally.
The mast 15 is erected on a slide base 16 that can be driven back and forth by a hydraulic cylinder/plunger device with respect to the clamp 13 at a position above the parallel pitch of the pile a in the parallel direction, and the slide base 16 is equipped with the clamp 13. It is mounted on saddle 17.

In addition to the above-mentioned static load type pile construction machines, the pile press-in reaction force can be taken by the dead weight of the static load type pile construction machine or by setting up an earth auger or similar screw anchor in the ground. It is also possible to apply a static downward load to the pile gripped by the chuck.
A static load type pile construction machine that uses a winch can also be used.

[Brief explanation of drawings]

Figure 1 is a front view showing one embodiment of the present invention, Figure 2 is a front view showing one embodiment of the present invention;
The figure is a line sectional view from Fig. 1, and Fig. 3 is a line sectional view from Fig. 1.
A line sectional view, FIG. 4 is a front view showing another embodiment of the present invention, FIG. 5 is a side view thereof, FIG. 6 is a front view showing a modified example of the ground penetrating blade, and FIG. 7 is a partial longitudinal section thereof. A side view, FIG. 8 is a front view showing a modified example of the tightening means, FIG. 9 is a side view thereof, and FIG. 10 is an example of a static load type pile construction machine to which the present invention applies the manner of use of the present invention penetrating machine. FIG. 1 is a ground penetrating machine, 2 is a static load type pile construction machine,
3 is the chuck, 4 is the press fit pile, 5 is the main body, 6
1 is a wedge-shaped clamp (tightening means), 7 and 11 are hydraulic cylinder plunger devices (drivers), 9 is a chisel, 10 is a ground penetrating blade, 13 is a clamp for grasping the pile that has already been press-fitted, and 18 is an eccentric claw-type clamp (Tightening means), 19 and 21 are wire ropes.

Claims (1)

[Claims] 1. A main body which is connected to the lower end of the pile to be press-fitted which is gripped by the chuck of the pile press-in machine and subjected to a static push-down load, and which is attached to the main body and is releasably tightened to the lower end of the pile. a ground penetrating blade that is installed on the main body and is movable up and down so that the lower end occupies a position below the lower end of the press-fitted pile held by the chuck; and a ground penetrating blade that is attached to the main body and drives the blade. The combination of the main body with the tightening means, the blade, and the drive machine is formed in a shape that can be pulled out to the ground and inserted into the ground when combined with the pile. A ground penetrating machine featuring: