JPS6119772B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction device that applies pressing force by hitting construction members such as piles at civil engineering or construction sites. A cylindrical cover is held within the external cover, a weight is placed inside the cylindrical cover, and a weight is dropped from the top of the cylindrical cover, and a holding mechanism for construction members such as piles is attached to the lower end of the cylindrical cover. The present invention relates to a device that is movably provided, has an elastic support interposed between the holding mechanism and a cylindrical cover, and is configured to strike the holding mechanism when the weight falls.

As a conventional device of this kind, for example, the
There is a pile driver as disclosed in Publication No. 47-10112. This pile driver has an inner cylinder (cylindrical cover) inside the hollow main body (corresponding to the outer cover), and a hammer (weight) is placed inside this inner cylinder so that it can move upward and fall freely. In addition, a pressure receiving anvil (holding mechanism) is provided at the lower end of the inner cylinder so as to be movable up and down, and an elastic support is interposed between this anvil and the lower end of the inner cylinder. By releasing the hammer and letting it fall freely, the pile is pressurized through the anvil, and the elastic support prevents the impact applied to the anvil when the hammer falls from being transmitted to the inner cylinder or main body.
Further, the space formed between the inner cylinder and the main body provides a kind of sound insulating layer to prevent noise from leaking to the outside.

However, in the case of the above-mentioned pile driver, as a device for pulling up the hammer, a pulling device main body is arranged at the upper part of the outer side of the inner cylinder, and this is slid and guided along a guide rail provided in the hollow main body. This method uses a lifting device which is driven up and down by a winch means, and a lifting rod which can be engaged with the lifting device and is vertically installed at an offset position at the end of the upper surface of the hammer. The structure inside the main body of the pile driver has become quite complex, raising manufacturing costs and making repairs and other maintenance difficult.Also, since the hammer is pulled up at an eccentric position where the pulling rod is installed, the hammer Undesirable impact against the inner circumferential surface of the inner cylinder imposes an extra load on the hammer when it is pulled up, which also tends to cause failure.

In view of the above-mentioned problems with the conventional equipment, the present invention employs a hydraulic cylinder to lift the hammer, that is, the weight. A hydraulic cylinder is arranged concentrically inside the tube, and the tip of the piston rod of this hydraulic cylinder is attached to the upper end of the cylindrical cover. It consists of a fixed weight formed to cover the outer periphery.

Next, the present invention will be explained according to illustrated embodiments.

In FIG. 1, 1 is a lead pipe provided on a reader (not shown), 2 is a cylindrical external cover,
This external cover 2 is supported by the lead pipe 1 so as to be able to rise and fall freely by a pair of guide gibs 3 and 4 provided at the upper and lower parts of the outer cover 2, and the lower half of the cylindrical cover 5 are fitted concentrically. An annular bracket 6 is fixed to the axial center of the cylindrical cover 5, and a buffer member 7 provided on the bracket 6
is opposed to an annular body 8 fixed to the upper end of the outer cover 2 within the outer cover 2, and a collar body 9 is fixed to the lower end of the cylindrical cover 5,
This flange body 9 is guided in the vertical direction at the lower part of the inner circumferential surface of the outer cover 2. Furthermore, a holding mechanism 11 that holds the upper end of the construction member 10, such as a stake, is arranged inside the lower end of the outer cover 2. As shown in FIGS. 1 and 3, this holding mechanism 11 includes a support plate 12 that is vertically slidable inside the outer cover 2, and a
The support tube 13 of the construction member 10 is concentrically fixed to the lower surface of the support plate 12, and the cylindrical cover 5 is connected to the upper surface of the support plate 12.
A guide tube 14 that protrudes so as to fit inside the guide tube 14, and a wooden buffer plate 15 loaded in the guide tube 14.
It consists of. The support plate 12 and the buffer plate 15 have through holes 1 that communicate the inside of the cylindrical cover 5 with the outside.
6 is formed. Reference numeral 17 indicates a bolt, and this bolt 17 is disposed so as to penetrate through the support plate 12 and the collar body 9, and has a ring body 18 held at its upper end. A coiled spring 19 is interposed between the coil spring 9 and the coil spring 19 in an initially deformed form. Therefore, the holding mechanism 11
is always urged upward via the spring 19, ring body 18, and bolt 17, and is supported in its upward movement position unless a certain downward external force is applied. In this state, a constant distance h is maintained between the outer cover 2 and the stop ring 20 fixed to the lower end of the outer cover 2.

Next, in FIGS. 1 and 2, 21 indicates a cylinder, and this cylinder 21 is connected to the cylindrical cover 5.
The piston rod 22 is disposed concentrically inside the cylinder, and the tip of the piston rod 22 is vertically attached to the upper end of the cylindrical cover 5 via a spherical joint mechanism 23. Specifically, it is attached to a cap 24 connected to the upper end of the cylindrical cover 5. Further, a cylindrical mass 26 is fixed to the outer circumference of the cylinder tube 25 of the cylinder 21 so as to cover it, and the lower end of this mass 26 is opposed to the buffer plate 15 of the holding mechanism 11. . In this case, a buffer material 28 is interposed between the bottom wall surface 27 of the inner fitting hole of the cylinder tube 25 formed in the weight 26 and the lower end surface of the cylinder tube 25. In FIG. 2, 29 indicates a sealing mechanism, and this sealing mechanism 29 consists of a ring body 3 fixed to the upper end of the cylinder tube 25.
0 and a push ring 31 that tightens this ring body 30
, a sealing material 32 and an O-ring 33 which are press-fitted between these and the piston rod 22. 34 denotes a piston, which is fixed to the base end of the piston rod 22 and divides the inside of the cylinder tube 25 into an upper chamber 35 and a lower chamber 36. On the other hand, the piston rod 22 has a hollow configuration, and an oil passage 37 is formed inside the piston rod 22. The upper and lower parts of the oil passage 37 communicate with the supply and exhaust pressure chamber 40 and the upper chamber 35 through passages 38 and 39, respectively. be done. Therefore, the upper chamber 35 becomes an operating pressure chamber 35a into which operating pressure for raising and lowering the cylinder tube 25 is injected and discharged. 40a is a supply/discharge pressure port. On the other hand, the lower end peripheral wall of the cylinder tube 25 and its closing plate 41
A pressure regulating valve 42 and a check valve 43 are attached to each of the valves. Among these, the check valve 43 is a mechanism that sends a corresponding amount of outside air into the lower chamber 36 as the inner volume of the lower chamber 36 gradually increases when the cylinder tube 25 descends or falls. Equipped with. Therefore, a through hole 45 formed in the weight 26 is communicated with the outside air inlet 44 of the check valve 43 . Note that this through hole 45 is always in communication with the through hole 16 of the buffer plate 15 and the support plate 12 through or without the inside of the cylindrical cover 5. Further, the pressure regulating valve 42 is for maintaining the inside of the lower chamber 36 at an appropriate constant positive pressure state, and the action of the pressure regulating valve 42 causes the cylinder tube 25 to maintain the positive pressure inside the lower chamber 36. The pressure constantly urges it in the direction of its fall. As the pressure regulating valve 42, for example, one shown in FIG. 4 is used.
That is, in FIG. 4, 46 is a cylindrical cover with a bottom, and a movable member 47 is provided inside this cover 46 so as to be able to slide in a closed manner, and a valve head 47a of this movable member 47 is attached to the cover 46. It is opposed to the attached valve seat 48. And the movable member 47
Due to the compression spring 49 interposed between the valve head 47 and the bottom wall of the cover 46, the valve head 47a is normally brought into pressure contact with the valve seat 48 to close the exhaust port 48a. Further, a port 50 is formed in the peripheral wall of the cover 46 to introduce the internal pressure of the lower chamber 36 . Therefore, if the initial deformation amount of the compression spring 49 is set appropriately, as the cylinder tube 25 rises and the internal volume of the lower chamber 36 gradually decreases, excess pressure will flow through the vent 50 and be released into the cover. 46, the movable member 47 is moved back against the bias of the compression spring 49 due to the excess pressure. Therefore, the exhaust port 48a is opened and excess pressure is released to the outside. In this way, when the excess pressure is released, the movable member 47 moves forward due to the urging force of the compression spring 49 and the exhaust port 48a is closed, so that the internal pressure of the lower chamber 36 is always maintained at a constant positive pressure. It will be done. Note that the weight 26 is formed with an exhaust hole (not shown) for releasing the excess pressure to the outside.

In such a cylinder 21, a push ring 3 provided at the upper end of the cylinder tube 25
1 is provided with a required number of through holes 51 at a plurality of locations in the circumferential direction. Therefore, the drain oil leaking from the seal mechanism 29 due to repeated expansion and contraction operations of the cylinder 21 flows out onto the outer circumferential surface of the push ring 31 through the through hole 51, and further onto the outer wall surface of the ring body 30 and the outer circumferential surface of the ring body 30. The lubricating oil is introduced along the upper end wall surface of the weight 26 into the gap 52 between the outer circumferential surface of the weight 26 and the inner circumferential surface of the cylindrical cover 5 to ensure smooth sliding between the two. Supplied.

Next, in FIG. 1, 53 indicates a lifting device. This lifting device 53 includes a support plate 55 that is supported by the lead pipe 1 by a guide gib 54 so as to be able to rise and fall freely, and a pair of hook members 56 that are pivotally supported on the support plate 55 in a symmetrical manner. , the sheave unit 5 supported in a suspended manner by the support base plate 55.
7, and a cable body 58 which is wound around the sheave unit 57 and connected to a hoisting machine (not shown) via a fixed sheave (not shown) attached to the upper end of the lead.

In addition, in FIG. 1, 59 is the cap 24.
The lifting bracket is shown secured to the top of the

Next, the action will be explained.

First, the pair of hook members 56 of the lifting device 53 are suspended by locking pins (not shown) provided on the outer cover 2. By this operation, the holding mechanism 11, the cylindrical cover 5, etc. are lifted up as one body while being supported by the stopper ring 20 provided at the lower end of the outer cover 2. In this state, the support cylinder 13 of the holding mechanism 11 is The upper end of the construction member 10 is held in a fitted manner. Next, construction material 1
After the lower end of the lifting device 53 is supported on the ground, the pair of hook members 56 of the lifting device 53 are swung outward and released from the locking pins of the outer cover 2. This results in
The outer cover 2 is lowered and is supported by the buffer member 7 of the cylindrical cover 5 of the ring body 8, and the cylindrical cover 5
The holding mechanism 11 is supported while being placed on the construction member 10. Next, when pressure oil is sent to the pressure chamber 35a of the cylinder tube 25 through the supply/discharge pressure chamber 40 and the oil path 37, the pressure causes the cylinder tube 25 and the weight 26 fixed thereto to move toward the cylindrical cover 5. You will be guided up by the. At this time, the pressure in the lower chamber 36 of the cylinder tube 25 is increased, but the excess pressure at that time is released to the outside through the pressure regulating valve 42. When the weight 26 reaches its upper limit indicated by the imaginary line in FIG. 1, the supply of the pressure oil is stopped, and
When the pressure sending valve (not shown) is opened, arrow A in Fig. 3
As shown, the weight 26 and the cylinder tube 25
falls due to its own weight, and hits the holding mechanism 11 just before its lower limit, driving the erection member 10 into the ground. At this time, outside air is introduced into the lower chamber 36 through the check valve 43. In addition, at the initial stage of the fall of the weight 26, a constant positive pressure is maintained in the lower chamber 36, so the weight 26 is biased by this positive pressure and is only affected by its own weight. An even larger impact force is generated, and a larger pressing force is applied to the erection member 10. When the weight 26 hits the holding mechanism 11, it directly hits the wooden buffer plate 1.
5, thereby causing the support plate 12 to descend relative to the outer cover 2 against the bias of the spring 19. Therefore, due to this blow, the outer cover 2
Since no impact force is applied to the lead pipe 1 that supports the outer cover 2 via the guide gib 3 and 4, the impact force is only small.
is protected from the impact force. Further, since the impact sound is prevented from being transmitted to the outside by the air layer formed between the cylindrical cover 5 and the outer cover 2, no noise pollution is generated in the surrounding area.

One process is completed with the lifting and dropping of the weight 26, so this process is repeated several times to press-fit the construction member 10 to the required depth. When the press-fitting of the erection member 10 is completed in this way, the lifting device 53 is lowered along the lead pipe 1. This is done by driving a winding machine (not shown) in the rewinding direction. Lifting device 5
3 is lowered, its hook member 56 is automatically caught on the locking pin of the outer cover 2. Therefore, when the lifting device 53 is next pulled up, the locking pin is locked to the hook member 56 and the outer cover 2 is lifted. Thereafter, the operations described above are repeated.

As explained above, the erection device of the present invention uses a hydraulic cylinder as a means for pulling up a weight. The tip is attached to the upper end of the cylindrical cover, and a weight formed to cover the outer periphery of the cylinder tube is fixed to the outer periphery of the cylinder tube, which is guided by the piston rod to move up and down. The internal space of the cylindrical cover can be used effectively, and there is no need to arrange any members outside the cylindrical cover or inside the outer cover, making the structure much simpler and more compact than conventional devices. Therefore, manufacturing costs are low and maintenance is also advantageous. Furthermore, when lifting the weight, the cylinder tube pulls it up along the center of the weight, so the lifting operation can be performed very smoothly and there are fewer failures.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing an embodiment of the erection device according to the present invention, FIG. 2 is a vertical cross-sectional view of a hydraulic cylinder,
FIG. 3 is an enlarged vertical cross-sectional view of the main part, and FIG. 4 is a schematic vertical cross-sectional view of the pressure regulating valve. 2... External cover, 5... Cylindrical cover, 10...
... Erecting member, 11 ... Holding mechanism, 21 ... Hydraulic cylinder, 22 ... Piston rod, 25 ... Cylinder tube, 26 ... Weight.

Claims (1)

[Claims] 1 Inside the outer cover that is raised and lowered along the leader,
A cylindrical cover is held, a weight is provided inside the cylindrical cover to be dropped from the top thereof, and a holding mechanism for a construction member such as a stake is provided at the lower end of the cylindrical cover so as to be movable up and down. In a construction device such as a pile, in which an elastic support is interposed between the holding mechanism and the cylindrical cover, and the falling weight hits the holding mechanism, a hydraulic cylinder is installed inside the cylindrical cover. The piston rods of the hydraulic cylinders are arranged concentrically, and the tip of the piston rod of the hydraulic cylinder is attached to the upper end of the cylindrical cover. A construction device, such as a pile, characterized by fixing a formed weight.