JPS648128B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a sand pile construction device for constructing sand piles in soft ground in order to improve the soft ground.
More specifically, the outer cylinder and the inner cylinder inserted therein are forcibly vibrated by a vibrator connected to the upper end of the inner cylinder while penetrating into the ground, and after the outer cylinder reaches a predetermined depth, While sand is introduced into the outer cylinder from the hopper, only the inner cylinder is vibrated by the vibrator after cutting the edge between the outer cylinder and the exciter, and the inner cylinder is moved by a reciprocating drive device for driving the inner cylinder. The present invention relates to a device which compacts sand in an outer cylinder by moving up and down with a predetermined stroke, and forms a sand pile while pulling out the outer cylinder and the inner cylinder.

(Prior art and its problems) In order to create a strong sand pile with this type of sand pile making device, the sand in the outer cylinder must be sufficiently compacted by the inner cylinder. It is necessary to have a sufficiently long stroke for vertical movement of the cylinder.
Conventionally, in this type of sand pile construction equipment, a fluid pressure cylinder for moving the inner cylinder up and down is connected to the lower end of the exciter, and this cylinder can directly move the exciter up and down. Since the inner cylinder integrated with the exciter is moved up and down, the inner cylinder can only move up and down by a predetermined stroke of the piston rod in the fluid pressure cylinder.
Therefore, in order to increase the vertical stroke of the inner cylinder, a correspondingly long and large hydraulic cylinder is required, and due to the arrangement of the device, the inner cylinder hangs coaxially with the lower end of the exciter. Since they are arranged in series, there are drawbacks such as the necessity of arranging at least two inner cylinder drive cylinders around the inner cylinder.

The present invention has a relatively short cylinder stroke.
In other words, even a relatively small fluid pressure cylinder can make the vertical movement stroke of the inner cylinder sufficiently large, and the degree of freedom in design such as the location and number of reciprocating drive devices such as fluid pressure cylinders is increased. The object of the present invention is to provide a sand pile construction device that can reduce costs by minimizing cylinder equipment costs.

(Means for Solving the Problems) In order to achieve the above object, the sand pile construction device of the present invention has an elevator frame, which has an outer cylinder hanging down and connected to the lower end via a sand charging hopper, attached to a leader. In addition to being equipped to move up and down, an exciter is arranged within the elevator frame so as to be movable up and down, and the upper end of the inner cylinder inserted into the outer cylinder is fixed to the lower end of the exciter. A connecting means for integrally connecting or disconnecting the vibrator and the outer cylinder is provided, and a reciprocating drive device for driving the inner cylinder up and down is installed at a required part of the elevator frame, and this A pulley is provided at the tip of the movable part of the reciprocating drive device, and one end of the rope connected to this pulley and the pulley provided in the relevant part of the elevator frame is fixed to the elevator frame, and the other end is fixed to the exciter. It is characterized by the fact that it can be worn.

(Example) Fig. 1 shows an overall view of the sand pile construction equipment. In this figure, 1 is a mobile machine stand, 2 is a leader that is erected and supported on this machine stand, and 3 is a leader 2. This elevator frame 3 is equipped with an elevator frame that can be raised and lowered freely.
An outer cylinder 4 for making sand piles, which is provided with a hopper 18 for inserting sand at the upper end, is suspended from the lower end of the
Further, an exciter 5 is disposed within the elevator frame 3 so as to be movable up and down, and the upper end of an inner cylinder 6 for sand pile construction, which is inserted into the outer cylinder 4, is fixed to the lower end of this exciter 5. A connecting device 7 that can be connected and disconnected from each other is interposed between the inner cylinder 6 and the elevator frame 3. A hydraulic cylinder 8 serves as a reciprocating drive device for vertically driving the inner cylinder, and is attached to the lower surface of the upper frame 15 of the elevator frame 3 via a bracket 9. A pulley 11 is pivotally attached to the tip of the piston rod 10 (movable part of the reciprocating drive device) of the hydraulic cylinder 8, and the pulley 11 and pulleys 12 and 13 are fixedly pivoted to the upper surface of the upper frame 15. A rope 14 for interlocking operation is connected, and one end of the rope 14 is fixed to the exciter 5 side, and the other end is fixed to the bracket 9 on the elevator frame 3 side.

The elevator frame 3 is constructed in the shape of a turret with an upper mount 15, a lower mount 16, and four guide columns 17, front, rear, left, and right, whose upper and lower ends are fixed between the upper and lower mounts 15 and 16, respectively. A sand charging hopper 18 is fixed to the lower surface side of the lower frame 16, and this hopper 18 is connected to the upper end of the outer cylinder 4 so as to communicate with the inside of the outer cylinder 4, so that the elevator frame 3 and the hopper 18 are connected to each other.
and the outer cylinder 4 have a mutually integral structure.
This elevator frame 3 is suspended from the top of the leader 2 by a rope 19 for lifting/lowering operation, and this rope 19 is led out from the movable machine stand 1 side and passes through pulleys 20 and 21 provided at the top of the leader to the machine frame 3. It is wound around a pulley 22 provided on an upper frame 15.
Further, guides 23 and 24 are provided on the side of the elevator frame 3, and these guides 23 and 24 are slidably engaged with guide rails (not shown) attached along the sides of the leader 2. is arranged to move up and down along the leader 2. The exciter 5 is fixed on a board 25 that can be slid up and down guided by the guide columns 17 of the elevator frame 3.
5, there are four support frames 26 on the front, rear, left and right sides of the exciter 5.
These support frames 26...
An upper plate 27 is fixed to the upper end, one end of the interlocking operation rope 14 is fixed to the center of the upper surface of the upper plate 27, and the upper end of the inner cylinder 6 is fixed to the center of the lower surface of the base plate 25. Therefore, when the piston rod 10 expands and contracts due to the operation of the hydraulic cylinder 8, the exciter 5 and the inner cylinder 6 are linked together through the pulley 11 and the rope 14 so as to move up and down simultaneously. Note that the inner cylinder 6 is inserted into the lower outer cylinder 4 through an opening 28 provided at the center of the lower frame 16 constituting the elevator frame 3.

As shown in an enlarged view in FIG. 2, the coupling device 7 has a fixing block 30 fixed to the upper end of the inner cylinder 6, which has a pair of U-shaped female members 29, 29 each tapering outwardly on both sides. , a pair of fluid pressure cylinders 3 on both sides are mounted on the lower pedestal 16 constituting the elevator frame 3.
1 and 31 (see Fig. 1) to each cylinder 3.
A substantially wedge-shaped male member 33 having a shape corresponding to each of the outwardly expanding tapered female members 29 is fixed to the tip of the piston rod 32 of No. 1, and the male members 33, 33 are moved as shown in FIG. As shown by phantom lines, the female members 29, 29 on both sides of the fixing block 30
The inner cylinder 6 side and the elevator frame 3 side are thereby integrally connected, and the male members 33, 33 are removed from the female members 29, 29 to separate them as shown by the solid line in the figure. This structure is configured to release the connection between the inner cylinder 6 side and the elevator frame 3 side.

In FIG. 1, reference numeral 34 indicates a shock absorber provided at the upper end of each guide column 17 constituting the elevator frame 3.
→This is to absorb the vertical vibration transmitted to the guide column 17 via the lower mount 16 and to prevent the vibration of the exciter 5 from being transmitted to the reader 2. Reference numeral 35 denotes a shock absorber provided at the lower end of each support frame 26 erected on the board 25, which absorbs the vertical vibration transmitted from the exciter 5 to each support frame 26 via the board 25, and Therefore, the vertical vibration of the exciter 5 is prevented from being transmitted from the interlocking operation rope 14 to the hydraulic cylinder 8 for driving the inner cylinder. These shock absorbers 34, 35 can be of a spring type, for example.

Next, the operation of the sand pile building apparatus having the configuration shown in FIG. 1 described above will be explained.

First, the elevator frame 3 with the outer cylinder 4 hanging thereon is suspended and supported at an appropriate height from the top of the leader 2, and the hydraulic cylinder 8 for vertically driving the inner cylinder is held in the piston retracted position for interlocking operation. The exciter 5 is suspended and supported at the lower limit position within the elevator frame 3 via the rope 14, and the coupling device 7 is operated in the connected state at this position to integrate the exciter 5 and the outer cylinder 4. . By activating the exciter 5 from this state, forced vibration in the vertical direction by the exciter 5 is transmitted to the inner tube 6 and the outer tube 4, and while the lifting operation rope 19 is let out, the outer tube 4 and the The inner cylinder 6 is penetrated into the ground. At this time,
Due to the action of the shock absorbers 34 and 35, the vertical vibration of the exciter 5 is not transmitted to the leader 2 or the hydraulic cylinder 8 for driving the inner cylinder.
There is no risk that the hydraulic cylinders 4 and 19 will separate from the pulleys supporting them or damage the hydraulic cylinder 8.

Next, after the outer cylinder 4 is penetrated into the ground to a predetermined depth as described above, sand is poured into the outer cylinder 4 from the hopper 18. Then, the connection by the coupling device 7 is released, and the edge between the exciter 5 and the outer cylinder 4 is cut, so that the forced vertical vibration by the exciter 5 is not transmitted to the outer cylinder 4, and the inner cylinder 6 is connected to the outer cylinder. 4 and to be able to move up and down independently. Then, by operating the hydraulic cylinder 8 for vertically driving the inner cylinder to extend and retract the piston rod 10, the exciter 5 is moved up and down via the interlocking operation rope 14, so that it is in an integral relationship with the exciter 5. The inner cylinder 6 is moved up and down separately from the up and down vibration caused by the vibrator 5. In this case, the shaft of the pulley 11 pivotally attached to the tip of the piston rod 10 of the hydraulic cylinder 8 moves as the piston rod 10 expands and contracts, forming a so-called movable pulley.
When it is moved up and down by the maximum stroke l of the piston rod 10, one end of the interlocking operation rope 14 is moved up and down by twice the maximum stroke l of the piston rod 10, and can therefore be moved up and down with a stroke corresponding to the inner cylinder 62l ( (See Figure 1).

As described above, only the inner cylinder 6 performs vertical vibration by the vibrator 5 and another vertical movement at a predetermined stroke, so that the ground around the outer cylinder 4 is protected from being agitated by the outer cylinder 4, and The sand in the outer cylinder 4 is compacted by the inner cylinder 6. In this way, while the sand in the outer cylinder 4 is compacted by the inner cylinder 6, the elevator frame 3 is raised via the operating rope 19 and the outer cylinder 4 is gradually pulled out. A sand pile is formed while being pushed out from the lower end of the cylinder 4. A jet air supply pipe (not shown) is arranged in the axial direction along the outer surface of the outer cylinder 4, and a jet nozzle (not shown) at the tip of the pipe is opened inside the lower end of the outer cylinder 4. By injecting jet air from an air compressor through the pipe and from the nozzle, sand is effectively pushed out from the lower end of the outer cylinder 4, and a strong sand pile can be quickly constructed.

Now, next, air spring device 3 is used as a reciprocating drive device.
An example in which 6 is used will be explained with reference to FIG.

The air spring device 36 includes two sets of upper bellows 38 and lower bellows 39 provided between the upper frame 15 and the lower plate 37, a movable plate 40 installed between both of these connecting parts, and this movable plate 40. A movable rod 41 is fixed to the center of the movable plate 40 and is fixed to the upper frame 15 and the lower plate 37. It consists of four guide rods 42...
A pulley 43 is pivotally attached to the lower end of the movable rod 41, and the above-mentioned interlocking operation rope 14 is attached to the pulley 4.
3, and a pulley 4 fixedly pivoted to the elevator frame 3.
4 and 45, one end of which is fixed to the exciter and the other end to a bracket 46.

This air spring device 36 is configured such that compressed air is alternately fed into an upper bellows 38 and a lower bellows 39 to cause a rod 41 to reciprocate up and down via a movable plate 40, and to generate an oscillator via a pulley 43 and a rope 14. 5 and the inner cylinder 6 can be moved up and down. The number of upper bellows and lower bellows 39 used in this air spring device 36 may be arbitrary, and the upper bellows 38 may be omitted and lowered by its own weight.
A compression spring may be used instead of the upper bellows 38.

FIG. 4 shows another embodiment of the coupling device,
Springs 47, 47 are installed on the lower pedestal 16,
The upper end 47a of this air spring 47 is adapted to come into contact with the lower surface of the substrate 25 on which the exciter 5 is attached. The peripheral wall 4 is located at the center near the upper end of the outer cylinder 4.
A square hole 49 surrounded by square holes 8, 48, etc. is provided in the inner cylinder 6, and a square hole 5 that is vertically longer than the square hole 49 is provided in the inner cylinder 6.
0 is provided, and a pin 51 passing through both square holes 49 and 50 is slidably provided in the square hole 49, and a hydraulic cylinder 53 is attached to the outer cylinder 4 by a bracket 52. The piston rod 53a is connected to the piston rod 53a, and can be inserted into and removed from the square hole 50.

In the operation of the device using the coupling device 7a shown in FIG. 4, when the outer cylinder 4 penetrates into the ground, the above-mentioned hydraulic cylinder 8 or the reciprocating drive device such as the air spring device 36 is operated to open the double square holes 49, 50. The inner cylinder is pulled up to the position where they match, and the hydraulic cylinder 53 is driven to insert the pin 51 across both square holes 49 and 50 (indicated by two-dot chain lines), and then compressed air is supplied to the air springs 47 and 47. The upper end portions 47a, 47a push up the lower surface of the substrate 5, thereby pressing the lower surface of the square hole 50 of the inner cylinder 6 against the pin 51, and the exciter 5 and the outer cylinder 4 become integral. Therefore, in this state, the exciter 5 is forcibly vibrated up and down to cause the outer cylinder and the inner cylinder 6 to penetrate into the ground. After penetrating to a predetermined depth, the compressed air in the air springs 47, 47 is released, and the hydraulic cylinder 53 is reversely driven to remove the pin 51 to release the connection, so subsequent operations are performed as described above. Same as in the example. Air spring 4 used here
7 and 47 serve to connect the exciter 5 and the outer cylinder 4 during pressurized expansion, and act as so-called shock absorbers during contraction, so that the vertical vibration of the exciter 5 is applied to the outer cylinder 4 and the machine frame. Prevent it from being transmitted to 3.

(Effects of the Invention) According to the present invention, the pulley that is reciprocated by the reciprocating drive device constitutes a so-called moving pulley, and therefore the maximum stroke of the vertical movement of the inner cylinder is twice or more than the maximum stroke of the reciprocating drive device. As a result, even if a small cylinder with a relatively short stroke or an air spring device is used as a reciprocating drive device, the inner cylinder can be moved up and down with a considerably long stroke. A strong sand pile can be created by sufficiently compacting the sand inside the outer cylinder. Moreover, since the exciter, the inner cylinder, and the reciprocating drive device are interlocked and connected by a rope, the degree of freedom in design, such as the location and number of reciprocating drive devices to be installed, is increased. This has the great effect of significantly reducing device manufacturing costs and making the structure more compact.

[Brief explanation of the drawing]

Fig. 1 is a partially cross-sectional overall side view showing one embodiment of the sand pile building device of the present invention, Fig. 2 is an enlarged perspective view of a coupling device in the device of Fig. 1, and Fig. 3 is an alternative reciprocating drive device. FIG. 4 is a side view similar to FIG. 1 showing an embodiment, and FIG. 4 is a side view similar to FIG. 1 showing another embodiment of the coupling device. 2...Leader, 3...Elevator frame, 4...Outer cylinder,
5... Exciter, 6... Inner cylinder, 7, 7a... Connection device, 8... Hydraulic cylinder (reciprocating drive device), 11
...pulley, 14...rope, 18...hopper,
36... Air spring device (reciprocating drive device), 43...
…pulley.

Claims (1)

[Claims] 1. A leader is equipped with an elevator frame with an outer cylinder hanging down and connected to the lower end via a sand charging hopper, and an exciter is disposed within this elevator frame so as to be movable up and down. A connecting means is provided at the lower end of the machine for fixing the upper end of the inner cylinder inserted into the outer cylinder, and for integrally connecting or disconnecting the vibration exciter and the outer cylinder. A reciprocating drive device for driving the inner cylinder up and down is installed in a required part of the elevator frame, a pulley is provided at the tip of the movable part of the reciprocating drive device, and a pulley is fixedly installed in the pulley and the required part of the elevator frame. A sand pile construction device characterized in that one end of a rope connected to a rope is fixed to an exciter and the other end is fixed to an elevator frame.