JPS5924032A - Pile penetrating and its drawing machine - Google Patents

Abstract

PURPOSE:To obtain a machine having a high clutching effect by using a system in which an additional input circuit provided with a pressure intensifier operating according to the increase in the internal pressure of an oil-pressure cylinder with the penetration of a pile is provided to the oil-pressure cylinder for a clamp and a chuck. CONSTITUTION:A working oil is sent to an oil-pressure cylinder 4 for a clamp, the clamp is closed, the working oil is filled up through a circuit 6 on the high- pressure side of a pressure intensifier 8, and thereby a preparation for the intensifier 8 is completed. When a pile is penetrated and the internal pressure of the oil-pressure cylinder 11 is correspondingly increased, beyond a pressure, pressure oil from the input circuit of the oil-pressure cylinder flows through a shuttle valve 10 into the low-pressure side of the intensifiers 8 and 9. According to the increase in the internal pressure of the oil-pressure cylinder 11, pressure oils of the oil-pressure cylinders 4 and 5 for the clamp and chuck are additionally supplied to increase the clutching force of the clamp.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pile press-in and pull-out machine, in particular, a hydraulic type clamp that grips a pile built in the ground as a reaction anchor, and a hydraulic lunge P-series between the clamp and the The present invention relates to a pile press-in and pull-out machine that is equipped with a hydraulic chuck as a component that can be driven relatively upwardly by a puller device and that grips the press-fit and pull-out pile.

Conventionally known pile press-fitting and pulling machines of this type have the following problem in that the clamps and chucks are of a fixed gripping force type.

The clamp of the pile press-fitting and pulling machine is used to grasp the pile built into the ground, and the chuck is used to grasp the press-fitted and pulled-out pile.
When the chuck is driven by a hydraulic plunger device to press the pile into or pull it out from the ground, the resistance to press-in and pull-out increases or decreases as the pile progresses, and many In this case, the maximum force required for press-fitting and pulling out is only 5% at the end for press-fitting and 5% at the beginning for pulling out, and for other processes, the maximum force required for press-fitting, In most cases, a force application of about 60% or less of the pull-out force is sufficient. Therefore, if the gripping force of a clamp or chuck is constant, it must be set to a strength corresponding to the maximum force for press-fitting and pulling out, and during about 95% of the beginning or end of the entire process. This means that the pile is gripped with an unnecessarily strong force, and the gripping action of the clamp or chuck only provides low mechanical efficiency, and is also disadvantageous in terms of the weight of the clamp or chuck, its service life, and the life of the pile.

The present invention eliminates the drawbacks of the prior art described above, provides high mechanical efficiency in the gripping action of clamps and/or chucks, and improves the gripping action of clamps and chucks. The present invention aims to provide a pile press-fitting and pulling machine that is advantageous in terms of t fit, service life, and pile life.

The pile press-in and pull-out machine of the present invention includes a hydraulic crane that grips the pile built in the ground as a reaction anchor, and a hydraulic plunger cylinder device between the clamp and the clamp, which allows relative vertical movement. In a pile press-fitting and pulling machine equipped with a hydraulic type chuck for gripping piles to be press-fitted and pulled out, an addendum is added to both or at least one of the hydraulic cylinder of the above-mentioned Cla...-5 and the hydraulic series of the chuck. An input circuit is provided, and the internal pressure of the hydraulic cylinder in the hydraulic plunge P-cylinder device increases itself as the pile is pressed in and pulled out, and when it reaches that pressure, the pressure increases thereafter. The present invention is characterized in that the supplementary input circuit is provided with a pressure booster that operates accordingly.

The pile press-in of the present invention, the pile press-in and pull-out by the pulling machine are the same as conventional ones, and as the press-in resistance increases as the press-in progresses, the internal pressure of the hydraulic cylinder of the hydraulic pressure cylinder device automatically increases. do,
In other words, it self-intensifies.

According to the present invention, when this self-pressure increase reaches a pressure, the hydraulic series of the clamp is activated in response to the subsequent pressure increase.
The pressure intensifier of the supplementary input circuit of the hydraulic cylinder of the clamp and/or chuck is activated, and the hydraulic pressure of the hydraulic cylinder of the clamp and/or the chuck is supplemented.
Increase the pile gripping force of the clamp and/or chuck. Self-increasing of the pressure in the hydraulic cylinder occurs even when there is hard ground at the pile press-in speed, and when the pressure exceeds this pressure, the pressure intensifier is activated in the same way, increasing the pile gripping force and pulling the hard ground layer. Once the pile tip has passed, the pressure intensifier returns to the non-pressurized state, and the pile gripping force automatically returns to its pre-intensification strength.

When pulling out a pile, the resistance at the initial stage of pulling out is large, and the internal pressure of the hydraulic cylinder of the hydraulic plunger cylinder device is also high. Increase power. As the pulling of the pile progresses and the pulling resistance decreases to a certain value, the pile gripping force is automatically reduced to the value with the previous increase removed.

As described above, according to the present invention, the pile gripping force of the clamp and/or chuck is not maximized throughout the entire process of pile press-in and pull-out, but is adjusted to the point at which the maximum press-fit and pull-out force is required. As a result, a high mechanical efficiency of the gripping action of the clamp and/or chuck can be obtained, and it is also advantageous in terms of weight, service life, and life of the pile of the clamp and/or chuck.

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, (1) is a hydraulic chuck, and (2) is a hydraulic chuck, which can be driven up and down relative to each other by the hydraulic P-cylinder device (3), as in the past. There is. The crane (1) grips a pile (not shown) built in the ground as a reaction force pile, and the chill hook (2) grips a press-fitted or pulled-out pile (not shown). 1) and the chuck (2) themselves are the same as before, and (4) is the hydraulic cylinder for operating the flan-j (1).
(5) is a hydraulic cylinder for operating the chuck (2), and the hydraulic cylinder: 52-L4) has an additional input circuit (6) installed at a predetermined input end, and the hydraulic cylinder:, /J (5) In this case, the supplementary input circuit (7) is added to the prescribed input 111. ) are connected to each other, and the low pressure side (anti-pressure increase side) of pressure intensifiers (8) and (9) are connected to the hydraulic pressure range P via all the settle valves 0.
- Connect to the specified input side of the hydraulic syringe uυ for vertical movement of the chuck (2) in the cylinder device @ (3).

0 is the hydraulic pump, (to) is the switching pulp of the hydraulic cylinder (4) of Cran-J (1), a< is the switching pulp of the hydraulic cylinder 〇〇, (IO is the oil 1 of the chuck (2)
This is the switching pulp of the ball cylinder (5).

The operation of the illustrated pile press-in and pull-out machine of the present invention will be described below.

Hydraulic Lunge P-Cylinder Device (3) Chuck (2)
) Set the switching pulp α→ of the vertical movement hydraulic cylinder αυ to neutral, close the switching pulp (to) of the hydraulic cylinder J-(4) of the clamp (1), and operate the hydraulic pump Q gong. . Then, the hydraulic oil is sent to the crane hydraulic cylinder (4) and the crank (1) is closed, and some of the hydraulic oil is sent to the high pressure side (pressure increasing side) of the pressure intensifier (8) in the circuit (6).
), the pressure intensifier (8) completes preparation for pressure increase. At this time, the oil on the low pressure side (anti-pressure increase side) of the pressure intensifier (8) is pushed back to the side of the pile press-in hydraulic oil circuit QQ of the hydraulic cylinder αυ via the seat pulp 01. The pressure intensifier (9) of the chuck hydraulic cylinder y, 4 (5) closes the chuck on the switching pulp 0Q and completes the preparation for pressure increase by force-feeding the hydraulic oil with the hydraulic cylinder ``j@''.

The clamp (1) is used to hold the pre-built pile, the chuck (2) is used to press fit and pull out the pile, and the hydraulic plastic is pressed into place.
The chuck (2) is pushed down by the cylinder y cylinder device (3) and the pile is press-fitted, and the accompanying hydraulic cylinder ql
) The pressure at which the self-increasing of the internal pressure of the
), oil is supplied to the pressure intensifier (8) and (
9), the pressure starts to increase, the hydraulic pressure increases, and the gripping force of the clamp (1) and chuck (2) increases. In response to the self-increase of the internal pressure of the hydraulic cylinder (b) based on the large pull-out resistance of Jνj, the pressure intensifiers (8) and (9) operate to increase the clamp gripping force of the clamp (1) and chuck (2). do. When the pull-out resistance decreases, the pressure intensifiers (8) and (9
) piston y moves in the opposite direction to when increasing pressure, that is, toward the low pressure side,
Kura: Reduces J-pu grip force.

[Brief explanation of drawings]

Fig. 1 is a schematic front view of the entire structure showing an embodiment of the present invention, Fig. 2 is a side view thereof, and Fig. 3 is a hydraulic circuit diagram. (1) ID cry (2) is a chuck (3) Hydraulic pressure plunger P-syringe device (4) Hydraulic cylinder of J pump (5) Hydraulic cylinder of chuck 4- (6) (7) Addendum input circuit (8) (9) The head of the pressure intensifier is the Settle Valp 01) is the hydraulic cylinder in the hydraulic plunger P-silicider device (see above) Fig. 1 Fig. 2

Claims (1)

[Claims] ■ Hydraulic type clamp that grips piles erected in the ground as a reaction force anchor, and a hydraulic plunge P-cylinder device that allows for relative upward drive between the clamp and the pile.
In a pile press-fitting and pulling machine equipped with a hydraulic type chuck for gripping piles, an additional input circuit is provided for both or at least one of the hydraulic series i'J- of the clamp and the hydraulic cylinder of the chuck. The hydraulic cylinder in the above-mentioned hydraulic plunger P-cylinder device:, /
The internal pressure of the tank increases by itself as the pile is pressed in and pulled out.
A pile press-in and pull-out machine, characterized in that the supplementary input circuit is provided with a pressure intensifier that operates in accordance with the subsequent increase in pressure when the pressure reaches that level.