KR102157638B1 - Hydraulic drive unit for both slow and high speed modes and pile drawer include this same - Google Patents

Abstract

The present invention relates to a pile drawing hydraulic drive apparatus for both a low speed mode and a high speed mode, and a pile drawer including the same, which can draw a pile by using speed modes appropriate for conditions on the spot to have excellent spot applicability and shorten pile drawing time by differentiating an injection amount of a working fluid to lift a cylinder at a low speed or a high speed. The pile drawing hydraulic drive apparatus for both a low speed mode and a high speed mode according to the present invention comprises: an elevation cylinder (10) having an internal space, provided with a first and a second rod drawing hole at both sides of an up and down lengthwise direction to face each other, and connected to the pile for drawing the pile; a first piston rod (20) including a first piston unit (21) inserted within the elevation cylinder to perform a straight reciprocating movement, and a first rod unit (22) held in the first rod drawing hole and having a free end portion supported on the ground; a second piston rod (30) including a second piston unit (31) inserted within the elevation cylinder to perform a straight reciprocating movement, and a second rod unit (32) held in the second rod drawing hole; a working fluid supply unit (40) supplying or recovering the working fluid into or from the elevation cylinder; and first to third flow paths allowing the working fluid supply unit to communicate between the first and the second piston unit of the first and the second piston, between the second piston unit and the cylinder and between the first piston unit and the cylinder, wherein the elevation cylinder is lifted relatively at the low speed or at the high speed by injecting different amounts of working fluid into the elevation cylinder through the first and the second flow path.

Description

A hydraulic drive system for both low and high speed modes for pulling out piles, and a pile pulling machine including the same{HYDRAULIC DRIVE UNIT FOR BOTH SLOW AND HIGH SPEED MODES AND PILE DRAWER INCLUDE THIS SAME}

The present invention relates to a file extractor, and more particularly, to a file extractor capable of low speed and high speed for drawing out a file settled in the ground through selection of a low speed mode and a high speed mode.

This part provides background information related to the content of the present application, and is not necessarily prior art.

In general, in construction and civil engineering sites, foundation work is performed in which various shapes of section steel piles (H-beam, I-beam, etc.) are buried in the ground at regular intervals to prevent the ground from collapsing.

After all the foundation work is completed, the section steel piles buried in the ground at regular intervals are recovered and reused. In general, a pile extractor is used to extract the section steel piles buried in the ground without damage.

A conventional pile extractor is composed of a pressing means installed opposite to the pile so as to pressurize the pile, and a hydraulic cylinder that moves the pressing means upward while pressing the section steel pile by the pressing means. At this time, it is common that the pressurizing means is also a cylinder using hydraulic pressure.

Registered Patent No. 10-0765374 discloses a base body fixedly installed on the ground, a pull-out operation body installed to be able to move up and down from the top of the base body to draw an H beam, and both sides of the upper surface of the base body Both sides of the main lifting cylinder protruding upward with the tip of the piston rod fixedly attached and the cylinder body fixedly attached to both sides of the withdrawal actuating body, and both sides fixedly installed so that the inner inclined surfaces of the withdrawal actuating body face each other The wedge guide is installed to be movable up and down with the outside inclined surface in contact with the inner inclined surfaces of the two wedge guides, and both operating wedges in charge of drawing out the H beam by compressing both sides of the intermediate connection of the H beam. , It is provided with a hydraulic cylinder for operating both wedges for crimping the two operating wedges to the intermediate connection portion of the H-beam, and the operating pin shaft passing through each of the ends of the piston rods of the hydraulic cylinders for operating the two wedges is each of the operating wedges In the H-beam take-out device configured to be connected in a state supported by a long hole formed in a connection bracket protruding at the top, the two sides described above based on an intermediate connection part of the H-beam passing through the center of each of the base body and the take-out actuator. A pair of left and right supports are formed facing each other on the upper surface of the withdrawal operating body outside of the operating wedge and both wedges. It is an H-beam withdrawal device used when constructing an earth wall in which the support brackets protruding from the earth wall are rotatably attached to the support pin shafts installed on the upper left and right supports of the pair. When hydraulic oil is injected into the upper part of the main lifting cylinder When the cylinder rises and the pile is pulled out and hydraulic oil is injected into the lower side, the angle of the main lift cylinder is lowered.When the pile is pulled out, hydraulic oil must be injected into the entire cylinder, so the main lift cylinder is slow to rise. The drawback is that it takes a long time.

Registered Patent No. 10-0765374

The present invention is to solve the above-described problems, and a hydraulic drive device for both low-speed and high-speed modes for pulling out a pile in a low-speed mode and a high-speed mode through system improvement of the hydraulic oil, and a pile pulling device including the same It is intended to provide qi and has its purpose.

In the hydraulic drive device for pulling out a pile for both low and high speed modes according to the present invention, a space is formed therein and first and second rod pulling holes are provided so as to face each other in the vertical direction while the pile is An elevating cylinder for directly or indirectly clamping; A first piston rod including a first piston portion inserted into the lifting cylinder to be linearly reciprocated and a first rod portion accommodated in the first rod take-out hole and supported by the ground; A second piston rod comprising a second piston portion inserted into the lift cylinder to be linearly reciprocated and a second rod portion accommodated in the second rod take-out hole; A hydraulic oil supply unit for supplying and recovering hydraulic oil into the elevator cylinder; First and second pistons of the first and second pistons, between the second piston and the cylinder, between the first piston and the cylinder, and including first to third passages through which each of the hydraulic oil supply portions, Different amounts of hydraulic oil are injected into the lifting cylinder through the first and second passages to raise the lifting cylinder at a relatively low or high speed.

The present invention is characterized in that the pretension beam is used as a pile, and includes a strand receiving portion for receiving the strand wired on one side of the pile.

According to the hydraulic drive device for both low-speed and high-speed modes according to the present invention and a pile extractor including the same, the cylinder is raised at low or high speed by varying the injection amount of hydraulic oil, thereby pulling the pile using a speed mode suitable for the field condition. Because it can be done, it has excellent field applicability and has the effect of shortening the working time for pile drawing.

In addition, when the pre-tension beam is used as a pile, an extra space for accommodating the strands of the pile is secured in the drawer, so that both the general pile and the pre-tension file can be pulled out, thereby improving the utility.

1A and 1B are perspective views of a low-speed and high-speed pile extractor, respectively, according to the present invention.
Figure 2 is a hydraulic system diagram of a hydraulic drive device for pulling out a pile for both low speed and high speed modes according to the present invention.
3 and 4 are operational state diagrams of the hydraulic drive device for pulling out a pile for both low and high speed modes according to the present invention, respectively,
3 is a low speed mode,
4 is a high-speed mode.
5 is a plan view showing a strand receiving portion of a pile applied to a pile extractor capable of low speed and high speed according to the present invention.
6 is a view showing another example of the first flow path applied to the file extractor capable of low speed and high speed according to the present invention.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary depending on the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout this specification.

As shown in FIGS. 1A, 1B and 2, the hydraulic drive device 100 for pulling out a pile for both low and high speed modes according to the present invention is directly or indirectly connected to the pile 1 to lift the pile 1 The first and second piston rods 20 and 30 are inserted into the lifting cylinder 10 to be pulled out and linearly movable through the pressure of hydraulic oil to guide the ascent and descending of the lifting cylinder 10, It is composed of a hydraulic oil supply unit 40 that supplies and recovers hydraulic oil, and is used as a set of two to pull out after clamping two points of the pile 1 (for example, an H beam).

The lifting cylinder 10 is a tubular structure in which a space is formed, and the first and second rods for drawing out and inserting the first and second piston rods 20 and 30 respectively at the lower and upper portions when the installation state is standard. Holes 11 and 12 are provided.

The lifting cylinder 10 is a lifting cylinder for lifting for drawing the pile 1.

The first piston rod 20 extends from the first piston part 21 and the first piston part 21 under pressure of hydraulic oil in the lifting cylinder 10, and the free end thereof is through the first rod withdrawal hole 11. It consists of a first rod portion 22 protruding to the outside and supported on the ground.

The first rod portion 22 is applied with a pressure plate 23 having a larger cross-sectional area than the first rod portion 22 so that the free end portion is supported on the ground in a wide area.

The present invention has been described as being used as a set of two lifting cylinders 10, in which case, the first piston rod 20 formed on each of the two lifting cylinders 10 has one first rod 22 It is preferable to be fixed to the acupressure plate (23).

The second piston rod 30 is arranged in a vertically symmetrical shape with the first piston rod 20, and the second piston part 31 is disposed above the first piston part 21 in the lifting cylinder 10. And the second rod part 32 protrudes to the outside through the second rod take-out hole 12.

The second rod part 32 is formed of a length that does not deviate from the second rod take-out hole 12 when the lifting cylinder 10 rises to the maximum height, thereby helping a stable ascent of the lifting cylinder 10.

The hydraulic oil supply unit 40 is composed of a tank, a pump, a pipe, a valve, etc. used in a hydraulic driving device, and a detailed description thereof is omitted.

In the present invention, the first to third flow paths 50, 60, and 70 are configured in order to ascend the lifting cylinder 10 at a low speed or at a high speed.

The first passage 50 is formed from the first rod portion 22 of the first piston rod 20 to the first piston portion 21, and the opening formed on the first rod portion 22 side is a hydraulic oil supply portion. While connected to the pipe of 40, the opposite end is formed to be open to communicate with the first and second piston portions 22 and 32.

The second passage 60 is formed to connect the space between the second rod portion 32 of the second piston rod 30 and the ceiling of the lifting cylinder 10 with the hydraulic oil supply portion 40.

The position in which the second piston part 31 is raised to the highest point on the ceiling of the lifting cylinder 10 is a position in which the second passage 60 is not blocked.

The third flow path 70 is formed to connect the space between the first piston part 21 of the first piston rod 20 and the bottom part of the lift cylinder 10 with the hydraulic oil supply part 40.

A position in which the first piston part 21 descends most downward to the bottom of the lifting cylinder 10 is a position in which the third flow path 70 is not blocked.

According to this configuration, low-speed and high-speed operation of the lifting cylinder 10 is possible. In the case of low speed, hydraulic oil is filled for the entire space inside the lifting cylinder 10, but in the case of high speed, the entire interior of the lifting cylinder 10 The hydraulic oil is filled into the space minus the volume of the second rod part 32 of the second piston rod 30 from the space, that is, a smaller amount of hydraulic oil is injected than at a low speed, so that the lifting cylinder 10 Although the lifting width is the same, it is possible to move at a higher speed.

The first to third flow paths 50, 60, and 70 are capable of both injection and recovery of hydraulic oil for repeating the ascending and descending of the lifting cylinder 10, and the operation will become more clear through the following explanation and drawings. .

The hydraulic drive device 100 for pulling a pile for both low and high speed modes of the present invention is disposed on both left and right sides of the pile 1 and is pulled out after clamping both sides of the pile 1, and at this time, the low speed disposed on the left and right It is also possible to connect the first piston rods 20 and 20 and/or the second piston rods 30 and 30 of the hydraulic drive device 100 for pulling out a pile in a high-speed mode with a connecting member. Through this connection, when the pile 1 is drawn out, the effect of preventing the left and right twist of the pile 1 is greater, and the speed and force thereof can be increased.

The connecting member is connected to the first piston rods (20, 20) and/or the second piston rods (30, 30) adjacent to the left and right on both sides in the length direction and then fixed through fasteners such as bolts, etc. This is possible.

In particular, the first piston rod 20 is supported on the ground and has stability, but the second piston rod 30 is a great help in securing stability through the connecting member because the second piston rod 30 moves up and down without a support base outside the lifting cylinder 10. do.

The action of the hydraulic drive device for pulling out a pile for both low speed and high speed modes according to the present invention is as follows.

1. Slow mode.

end. Increase.

In the case of a low-speed rise, the first flow path 50 is an injection path of hydraulic oil, and the third flow path 70 is a discharge path of hydraulic oil, and the valve is controlled to open and close for injection and discharge of hydraulic oil.

The state of FIG. 2 is an initial mounting state, and as shown in FIG. 3, when hydraulic oil is injected through the first flow path 50, the hydraulic oil is above the first piston part 21 of the first piston rod 20, that is, It is injected between the first and second piston parts 21 and 31.

Therefore, since the first piston rod 20 is supported on the ground, when hydraulic oil is injected between the first and second piston parts 21 and 31, the lifting cylinder 10 and the second piston rod 30 rise together. And eventually the pile 1 is pulled out by rising.

In this process, the hydraulic oil in the lifting cylinder 10 is discharged to the outside of the lifting cylinder 10 through the third flow path 70.

The space to be filled with the hydraulic oil during the low-speed rise is the entire interior of the lifting cylinder 10, so the speed is relatively slow. However, since the injection amount of hydraulic oil is large, the pile 1 can be stably pulled out with a large force.

I. descent.

When descending, the third flow path 70 is an injection path of hydraulic oil, and the first flow path 50 is a discharge path of hydraulic oil, and the valve is controlled to open and close for injection and discharge of hydraulic oil.

When the lifting cylinder 10 is raised, it must be lowered to the initial position in order to further pull out the pile 1, and the first piston part 21 of the first piston rod 20 through the third passage 70 When hydraulic oil is injected between the bottom part and the bottom part of the lifting cylinder 10, the lifting cylinder 10 and the second piston rod 30 descend together, and in this process, the first and second pistons through the first flow path 50 The hydraulic oil between the parts 21 and 31 is discharged.

2. Fast mode (see Fig. 4).

end. Increase.

During high-speed rise, the second flow path 60 is an injection path of hydraulic oil, and the third flow path 70 is a discharge path of hydraulic oil, and the valve is controlled to open and close for injection and discharge of hydraulic oil.

The state of FIG. 2 is an initial mounting state, and as shown in FIG. 4, when hydraulic oil is injected through the second flow path 60, the hydraulic oil moves up and down with the upper portion of the second piston part 31 of the second piston rod 30. It is injected between the ceiling of the cylinder 10.

Therefore, since the first piston rod 20 is supported on the ground, the first and second piston rods 20 and 30 only raise the lifting cylinder 10 while maintaining the position, and eventually the pile 1 ) Is drawn by rising.

In this process, the hydraulic oil in the lifting cylinder 10 is discharged to the outside of the lifting cylinder 10 through the third flow path 70.

Since the space filled with hydraulic oil when rising at high speed is obtained by subtracting the volume of the second rod part 32 of the second piston rod 30 from the entire interior of the lifting cylinder 10, a smaller amount of hydraulic oil is injected than at low speeds. Even so, since the lifting cylinder 10 can be raised to the same height as at low speed, the speed is high.

The arcs of FIGS. 3 and 4 are cross-sections of a space into which hydraulic oil is injected, and it can be seen that the injection area of the hydraulic oil at high speed is smaller than the injection area of the hydraulic oil at low speed.

I. descent.

When descending, the third flow path 70 is an injection path of hydraulic oil, and the second flow path 60 is a discharge path of hydraulic oil, and the valve is controlled to open and close for injection and discharge of hydraulic oil.

When the lifting cylinder 10 is raised, it must be lowered to the initial position in order to further pull out the pile 1, and the first piston part 21 of the first piston rod 20 through the third passage 70 When hydraulic oil is injected between the bottom part and the bottom part of the lifting cylinder 10, only the lifting cylinder 10 descends while the first and second piston rods 20 and 30 maintain their positions. In this process, the hydraulic oil between the second piston part 31 and the lifting cylinder 10 is discharged through the second passage 60.

The low speed mode and the high speed mode have a difference in force as well as a speed difference. Therefore, when a large force is required, the pile is pulled out in the low speed mode, and when a fast pulling is possible, the pile is pulled out in the high speed mode.

The pile extractor 200 comprising a hydraulic drive device for pulling a pile for both low speed and high speed modes according to the present invention includes a hydraulic drive device 100 for pulling a pile for both low speed and high speed modes, and a pair of left and right pile clamps 210 Includes. The present invention is not limited to the H-beam pile drawer, and various shapes of pile drawers such as circular piles and square piles are possible through deformation of the clamp.

The pile clamp 210 is composed of a clamp lifting cylinder 211 and a clamp 212, and clamps both left and right sides of the web of the pile 1.

The clamp lifting cylinder 211 is connected to the lifting cylinder 10 of the hydraulic drive device 100 for both low speed and high speed modes through the base 213, and is installed upside down so that the rod faces downward, At this time, the end of the lifting cylinder is hinged to the base 213 so that the end of the lifting cylinder can be rotated. The clamp lifting cylinder 211 is clamped by attaching the clamp 212 to the pile 1 and, conversely, dropping it from the pile 1 to perform clamping. Release.

The base 213 is configured to have a part to which the lifting cylinder 10 is fixed and a part to which the clamp lifting cylinder 211 is installed.

The clamp 212 is a part that grabs and clamps the web of the pile 1 from both left and right sides, and is hinged to the rod of the clamp lifting cylinder 211 and the surface is composed of irregularities.

The clamp 212 is not limited to the shape described above.

The present invention includes a case 230 in the form of a box in which the hydraulic oil supply unit 40 is accommodated (raising and lowering together with the lifting cylinder 10), and at this time, the case 230 includes a pile 1 (pre-tension beam). ) Of the strand 2 is accommodated, a rigid receiving portion 231 is formed.

The rigid receiving portion 231 is preferably formed as a groove in the space in which the strand 2 is accommodated in the case 230, and thus, the present invention is a multipurpose drawer capable of drawing both a pile of a general beam and a pretension beam. to be.

In addition, the case 230 includes a file accommodating part in the form of surrounding part or all of the circumferential part of the file 1, and FIG. 1A is a form having an open part to surround part of the circumferential part of the file 1 ( It is a form in which one flange and web of 1) are wrapped and the other flange is exposed}, and FIG. 1B is a form that surrounds the entire circumference of the pile (1).

The rigid receiving portion 231 and the pile receiving portion as described above are equally applied to the acupressure plate 23.

6 shows another example of the first flow path 50 applied to the present invention, and the first flow path 50 is a flow path between the first and second piston parts 21 and 31 and through the hydraulic oil supply part 40 Therefore, as shown in FIG. 6, the first flow path 50 may be formed through the lifting cylinder 10 so as to pass through the hydraulic oil supply unit 40 and the first and second piston units 21 and 31.

Accordingly, although not shown in the drawings, the first passage 50 may pass through the second rod portion 32 and the first piston portion 31 of the second piston rod 30.

In addition, the first passage 50 may be formed in two or more of the inside of the first piston rod 20, the inside of the second piston rod 30, and the lifting cylinder 10, and in this case, two Any one of the first flow path 50 is selected and used through the opening and closing of the valve, or both can be used simultaneously.

10: lifting cylinder,
20: first piston rod, 21: first piston part
22: first rod part,
30: second piston rod, 31: second piston part
32: second rod part,
40: hydraulic oil supply,
50,60,70: 1st to 3rd euros,

Claims (5)

A lifting cylinder 10 having a space formed therein and provided with first and second rod take-out holes so as to face each other in the vertical direction while directly or indirectly clamping the pile for pulling out the pile;
A first piston rod comprising a first piston part 21 inserted into the lift cylinder to be linearly reciprocated and a first rod part 22 accommodated in the first rod take-out hole and supported on the ground with a free end (20) and;
A second piston rod (30) comprising a second piston part (31) inserted in a linear reciprocating manner into the lift cylinder and a second rod part (32) accommodated in the second rod take-out hole;
A hydraulic oil supply unit 40 for supplying and recovering hydraulic oil into the elevator cylinder;
First and second pistons of the first and second pistons, between the second piston and the cylinder, between the first piston and the cylinder, and including first to third passages through which each of the hydraulic oil supply portions,
The first flow path is formed to pass through the first rod part or through the cylinder so that a space between the hydraulic oil supply part and the first and second piston parts communicates,
The second flow path is formed to connect the space between the second rod part of the second piston rod and the ceiling of the lifting cylinder with the hydraulic oil supply part,
The third flow path is formed to connect the space between the first piston part of the first piston rod and the bottom part of the lifting cylinder with the hydraulic oil supply part,
Different amounts of hydraulic oil are injected into the lifting cylinder through the first and second passages to raise the lifting cylinder at a relatively low or high speed,
The lifting cylinder and the second piston rod are raised together through the inflow of hydraulic oil through the first flow passage and the discharge of hydraulic oil through the third flow passage, while the inflow of hydraulic oil through the third flow passage and the hydraulic oil through the first flow passage The lifting cylinder and the second piston roll are lowered together through the discharge of and drawn at a low speed,
The lifting cylinder is lowered by inflow of hydraulic oil through the third flow passage and discharge of hydraulic oil through the second flow passage, while the inflow of hydraulic oil through the second flow passage and discharge of hydraulic oil through the third flow passage A hydraulic drive device for pulling a pile for both low speed and high speed modes, characterized in that the pull-out is performed at high speed by raising the pull-out. delete The method according to claim 1, wherein the two hydraulic drive devices for pulling out the pile for both low and high speed modes are used as a set, and the two second piston rods protruding to the outside of the lifting cylinder include a second rod part Hydraulic drive device for pulling out a pile for both low speed and high speed modes, characterized in that connected and supported through each other.
It is disposed in a pair of left and right, and a low-speed and high-speed mode combined hydraulic drive device 100 for pulling out a pile according to claim 1;
It includes a pile clamp 210 clamping the pile for drawing,
The pile clamp is a pile extractor comprising a hydraulic drive for pulling a pile for both low and high speed modes, characterized in that fixed to the lifting cylinder of the hydraulic drive device 100 for pulling out both low and high speed modes.
The pile extractor according to claim 4, further comprising a steel wire receiving part for receiving a wire wire wired outside the pile.

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