JP2020105794A - Pile press-fitting machine - Google Patents

Abstract

To provide a pile press-fitting machine capable of suppressing a rotation of a movable pawl.SOLUTION: In a pile press-fitting machine 1 for gripping a pile P with a chuck 20 and press-fitting it into the ground, the chuck 20 comprises a movable pawl 31 and a fixed pawl 30 arranged to face each other in order to grip the pile P, the movable pawl 31 is held so as to be able to move toward and away from the fixed pawl 30 in a guide surface 45 in the state where the peripheral surface is constrained by the guide surface 45 so that it cannot rotate, and comprises a pressing mechanism (hydraulic cylinder 32) that moves the movable pawl 31 toward and away from the fixed pawl 30. The movable pawl 31 is non-rotatably restrained by the guide surface 45 that covers the entire circumferential surface of the movable pawl 31. For example, a pawl-side flat portion 40 is formed on the peripheral surface of the movable pawl 31. On the guide surface 45, a guide-side flat surface portion 46 facing the pawl-side flat surface portion 40 is formed. Therefore, the rotation moment acting on the movable pawl 31 can be received by the entire guide-side flat surface portion 46 formed on the guide surface 45.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pile press-fitting machine that press-fits a pile into the ground.

As a method of burying various steel pipe piles and shaped steel piles by burying them in the ground, by grasping the upper end of the existing pile embedded in the ground with a clamp and taking a reaction force, the chuck holding the pile is moved up and down. There is a known construction technology in which new piles are sequentially pressed into positions adjacent to existing piles.

The pile press-fitting machine used for such construction has a saddle fixed to an existing pile through a plurality of clamps, and a slide frame that can move in the front-rear direction with respect to the saddle, and is rotatably attached to the slide frame. A chuck that can move up and down is attached to the leader mast. As a pile used for press-fitting, a pile such as a steel sheet pile, a steel pipe sheet pile, a steel pipe pile, or a concrete pile is known. The chuck that holds the pile has a fixed claw and a movable claw that are arranged to face each other in the horizontal direction. The new pile is grasped by the fixed pawl and the movable pawl. Then, while holding the upper end of the existing pile with the clamp at the bottom of the saddle and taking the reaction force, the new pile is gripped by the chuck, and the chuck moves up and down along the leader mast by the operation of the main cylinder, so that the pile is grounded. It is designed to be pressed into. In this way, the new pile is press-fitted to the position adjacent to the existing pile, and while holding the press-fitted new pile with the chuck to obtain the supporting force, the clamp is once opened to raise the saddle, and the pile press-fitting machine is It is self-propelled to the next position. In this way, by alternately repeating press-fitting of new piles and self-propelling of the pile press-fitting machine, new piles are sequentially press-fitted to positions adjacent to existing piles.

In the pile press-fitting machine as described above, the weight of the pile press-fitting machine acts on the movable claws as a rotation moment when the pile press-fitting machine is self-propelled. Further, since the press-fitting reaction force received from the ground when the pile is press-fitted into the ground and the action point of the main cylinder do not match, the rotational moment generated due to the mismatch also acts on the movable claw. Therefore, there is disclosed a mechanism in which a rotation preventing means such as a key is attached to a part of the movable claw so that the movable claw does not rotate even when receiving such a rotation moment.

JP, 2002-285554, A

However, the rotational moment acting on the movable pawl is not small, and particularly in a large-sized pile press-fitting machine, a considerably large rotational moment acts on the movable pawl during self-propelling or during press-fitting/pulling-out of the pile. For this reason, during repeated construction, the key on which the rotation moment concentrates and acts is likely to wear or deform. If this situation is left unattended, the movable claws will rotate when self-propelled, making it difficult to lift the pile press-fitting machine to a sufficient height, and it may not be possible to transmit sufficient force to the pile during press-fitting/pulling-out. There is. On the other hand, the size of the movable claw is limited due to the engagement with the pile, the key cannot be made large, and the load (contact pressure) concentrated on the key is large.

In addition, it was necessary to repair or replace the worn and deformed movable claws and keys on a regular basis to some extent. However, in order to repair the worn and deformed movable claws and keys, it is necessary to perform work such as welding overlay and reheat treatment, which requires time and cost for processing. Further, frequent replacement causes a high cost.

Therefore, an object of the present invention is to provide a pile press-fitting machine that can effectively prevent the rotation of the movable pawl.

According to the present invention, a pile press-fitting machine that grips a pile with a chuck and press-fits it into the ground, wherein the chuck includes a movable pawl and a fixed pawl arranged to face each other in order to grip the pile, The movable claw is held in the guide surface such that the movable claw can approach and separate from the fixed claw in a state where the peripheral surface of the movable claw is non-rotatably restrained by the guide surface, and the movable claw approaches the fixed claw. A pile press-fitting machine is provided which is provided with a pressing mechanism for separating the pile.

In this pile press-fitting machine, a claw-side flat surface portion may be formed on the peripheral surface of the movable claw, and a guide-side flat surface portion facing the claw-side flat surface portion may be formed on the guide surface. A pair of the claw-side flat portions are formed at positions opposite to each other on the peripheral surface of the movable claw, and a pair of guide-side flat portions facing the claw-side flat portion are also formed on the guide surface. Is also good. A color member having the guide surface may be provided, and the color member may be replaceably attached to the chuck. Further, the pressing mechanism may be a hydraulic cylinder that houses a rod inside a tube, and the movable claw may be connected to the tube.

In the pile press-fitting machine of the present invention, the movable claw is non-rotatably restrained by the guide surface that covers the entire peripheral surface of the movable claw, and for example, the claw-side flat surface portion is formed on the peripheral surface of the movable claw, A guide-side flat surface portion that faces the claw-side flat surface portion is formed on the guide surface. Therefore, the rotation moment acting on the movable claw can be received by the entire guide-side flat surface portion formed on the guide surface. Therefore, according to the present invention, wear and deformation between the claw-side flat surface portion formed on the movable claw and the guide-side flat surface portion formed on the guide surface can be minimized, and the rotation of the movable claw can be effectively prevented. It becomes possible.

It is a side view of the pile press-fitting machine concerning an embodiment of the invention. It is a top view of the pile press-fitting machine concerning an embodiment of the invention. It is a front view of the pile press-fitting machine concerning an embodiment of the invention. FIG. 7 is a plan view of the casing chuck for explaining the movable claw that is separated from the fixed claw. FIG. 6 is a side view of the casing chuck for explaining the movable claw that is separated from the fixed claw. It is a front view of the movable nail|claw in the state separated from the fixed nail|claw. FIG. 6 is a plan view of a casing chuck for explaining a movable claw in a state of approaching a fixed claw. FIG. 7 is a side view of the casing chuck for explaining the movable claw in a state of approaching the fixed claw. It is a front view of the movable claw in the state where it approached the fixed claw. It is a perspective view of a movable claw. FIG. 7 is a front view of a movable claw in which a claw-side flat surface portion and a guide-side flat surface portion are vertically formed. FIG. 7 is a front view of a movable claw in which a claw-side flat portion and a guide-side flat portion are formed vertically and horizontally.

Embodiments of the present invention will be described below with reference to the drawings. In the present specification and the drawings, elements having substantially the same functional configuration are designated by the same reference numerals, and duplicate description will be omitted. In addition, in the present specification, the front is a direction in which press-fitting construction proceeds with the pile press-fitting machine 1, and in FIGS. 1 and 2, the right side is the front and the left side is the rear.

As shown in FIGS. 1 to 3, three clamps 11 are arranged side by side in the front-rear direction on a lower portion of a saddle 10 which is a main body of the pile press-fitting machine 1 according to the embodiment of the present invention. Each clamp 11 is composed of a fixed claw 12 and a movable claw 13, and the movable claw 13 is moved toward and away from the fixed claw 12 by the operation of a cylinder incorporated in the movable claw 13. By the operation of the cylinder, the upper end of the existing pile P is sandwiched between the fixed pawl 12 and the movable pawl 13, and the saddle 10 is fixed to the existing pile P and the existing pile P is opened. You can switch. In FIG. 1, the upper ends of three existing piles P are clamped by the clamps 11 to fix the saddle 10, and one new pile P is press-fitted in front of the three piles P. It shows the state. In the embodiment, a U-shaped steel sheet pile is shown as an example of the pile P.

A slide frame 15 that is slidable in the front-rear direction with respect to the saddle 10 is provided on the upper portion of the saddle 10. A leader mast 16 serving as a turning base is mounted on the slide frame 15. The turning of the leader mast 16 is performed by a rotary drive source (not shown) such as a motor provided on the lower surface side of the leader mast 16, for example.

In front of the leader mast 16, a chuck 20 that can move up and down along an elevating guide 17 is attached. The chuck 20 has a structure in which a casing chuck 22 is attached to a chuck frame 21 that is attached to a lift guide 17 in front of the leader mast 16 so as to be lifted and lowered. The entire chuck 20 (chuck frame 21 and casing chuck 22) is integrally moved up and down by the expansion and contraction operation of the main cylinder 25. The rod side of the main cylinder 25 is attached to the leader mast 16, and the tube side is attached to the chuck 20 (chuck frame 21). Therefore, the chuck 20 moves up with respect to the leader mast 16 by the extension operation of the main cylinder 25, and the chuck 20 descends with respect to the leader mast 16 by the shortening operation of the main cylinder 25.

The casing chuck 22 is rotatably attached to the chuck frame 21. The casing chuck 22 has a tubular shape as a whole, and a U-shaped opening portion 26 penetrating in the vertical direction in a plan view is provided inside the casing chuck 22. The pile P, which is the object of press-fitting, is vertically passed through the opening 26.

A fixed claw 30 and a movable claw 31 are provided on the lower inner side of the casing chuck 22 so as to face each other in the horizontal direction. The movable claw 31 is moved toward and away from the fixed claw 30 by the operation of the hydraulic cylinder 32 that is a pressing mechanism.

As shown in FIGS. 4 to 10, the hydraulic cylinder 32 has a configuration in which the rod 36 is housed inside the tube 35, and as shown in FIGS. Due to the hydraulic pressure, the rod 36 is shortened with respect to the tube 35. Further, as shown in FIGS. 7 and 8, the rod 36 is extended and operated with respect to the tube 35 by the hydraulic pressure supplied into the tube 35 from the circuit 38.

The rear end of the movable claw 31 (the left end of the movable claw 31 in FIGS. 4, 5, 7, and 8) is connected to the tip of the tube 35 (the right end of the tube 35 in FIGS. 4, 5, 7, and 8). The movable claw 31 is adapted to interlock with the tube 35 of the hydraulic cylinder 32.

As shown in FIG. 10, the movable claw 31 has a substantially cylindrical shape, and a pair of left and right claw-side flat portions 40, 40 are formed on the peripheral surface thereof. A hose (not shown) for supplying high-pressure fluid to a jet nozzle attached to the lower end of the pile P to be press-fitted is provided at the tip of the movable claw 31 (the right end of the movable claw 31 in FIGS. 4 and 7). A hose groove 41 for passing through is provided.

The movable claw 31 is held inside a guide surface 45 provided on the casing chuck 22. The guide surface 45 has a substantially cylindrical shape so as to cover the entire circumferential surface of the movable claw 31, but a part thereof faces the pair of left and right claw-side flat portions 40, 40 formed on the movable claw 31. A pair of left and right guide-side flat portions 46, 46 are formed. With the movable claw 31 held inside the guide surface 45, the claw-side flat surface portions 40, 40 and the guide-side flat surface portions 46, 46 are in close contact with each other. However, since the flat surfaces of the claw-side flat portions 40, 40 and the guide-side flat portions 46, 46 are in close contact with each other, the movable claw 31 is fixed inside the guide surface 45 in a non-rotatable manner and is fixed. It is held so as to be able to approach and separate from 30.

In this embodiment, the guide surface 45 is provided on the collar member 47. The collar member 47 is detachably attached to the casing chuck 22 and can be replaced as appropriate.

In the hydraulic cylinder 32 that is the pressing mechanism, the tip of the rod 36 (the left end of the rod 36 in FIGS. 4, 5, 7, and 8) is fixed to the flange 50 provided on the casing chuck 22. Therefore, as shown in FIGS. 4 and 5, when the rod 36 is shortened with respect to the tube 35 by the hydraulic pressure supplied into the tube 35 from the circuit 37, the tube 35 moves in the shortening direction (see FIGS. And the movable claw 31 is drawn into the guide surface 45. As a result, the movable claw 31 is separated from the fixed claw 30, and the grip of the pile P to be press-fitted is released.

Further, as shown in FIGS. 7 and 8, when the rod 36 is extended and operated with respect to the tube 35 by the hydraulic pressure supplied into the tube 35 from the circuit 38, the tube 35 is extended in the extension direction (see FIGS. And the movable claw 31 projects from the inside of the guide surface 45. As a result, the movable claw 31 approaches the fixed claw 30, and the pile P to be press-fitted is gripped between the fixed claw 30 and the movable claw 31.

In the pile press-fitting machine 1 according to the embodiment of the present invention configured as described above, as shown in FIGS. 1 to 3, the upper ends of the three existing piles P are clamped by the clamps 11 and the saddle 10 is held. In the state in which is fixed, a new pile P is press-fitted in front of the existing three piles P. When the new pile P is pressed into the ground by the stroke of the main cylinder 25, the grip of the new pile P is once released, and the chuck 20 is lifted by the extension operation of the main cylinder 25. Then, at the position where the chuck 20 is raised, the new pile P is gripped again. Then, the chuck 20 is lowered by the shortening operation of the main cylinder 25, and new piles P are further pressed into the ground. By repeating this operation, the new pile P is press-fitted into the ground to a predetermined depth, and the press-fitting of the new pile P at the position adjacent to the front of the existing three piles P is completed.

Next, with the upper ends of the same three existing piles P clamped by the clamps 11 and the saddle 10 fixed, the next new pile P is press-fitted in front of the new pile P that has been struck. .. That is, in a state where the upper ends of the same three existing piles P are sandwiched by the clamps 11 and the saddle 10 is fixed, the slide frame 15 slides forward and the leader mast 16 moves forward, The chuck 20 moves to a position where the next new pile P is press-fitted. Then, the next new pile P is gripped by the casing chuck 22 of the chuck 20 in a predetermined posture. Then, the chuck 20 is lowered by the shortening operation of the main cylinder 25, and the next new pile P is connected with the joint at the front end of the new pile P that has been hit and the joint at the rear end of the next new pile P. Press into the ground.

When the next new pile P is pressed into the ground by the stroke of the main cylinder 25, the grip of the next new pile P is once released, and the chuck 20 is lifted by the extension operation of the cylinder 25. Then, at the position where the chuck 20 is raised, the next new pile P is gripped again. Then, the chuck 20 is lowered by the shortening operation of the main cylinder 25, and the next new pile P is further pressed into the ground. By repeating this operation, first, the next new pile P is press-fitted at least to a depth at which the pile press-fitting machine 1 can be supported.

Next, while the next new pile P is gripped by the chuck 20, the clamping by the clamps 11 at the bottom of the saddle 10 is released. Next, while the next new pile P is being gripped by the chuck 20, the main cylinder 25 is shortened so that the pile press-fitting machine 1 (saddle 10) is clamped until now with the chuck 20 as a fulcrum. Lifted above the three existing piles P. Next, with the chuck 20 holding the next new pile P, the pile press-fitting machine 1 (saddle 10) is moved by the slide movement of the slide frame 15 by the width of one pile P (self Run). Then, the extension operation of the main cylinder 25 lowers the pile press-fitting machine 1 (saddle 10), and the three clamps 11 provided on the lower portion of the saddle 10 again cause the three existing piles P (one of them to be the pile P). Piles P are new piles P that have just been hammered.), and the saddle 10 of the pile press-fitting machine 1 is fixed to the existing piles P to take a reaction force.

Then, the next new pile P is further pressed into the ground, the next new pile P is pressed into the ground to a predetermined depth, and the press fitting of the next new pile P is completed. By repeating the fixing described above, new piles P are sequentially press-fitted adjacent to the existing piles P.

Here, in the pile press-fitting machine 1 as described above, the weight of the pile press-fitting machine 1 acts on the movable claw 31 as a rotation moment when the pile press-fitting machine 1 is self-propelled. Further, since the press-fitting reaction force received from the ground when press-fitting the pile P into the ground does not match the action point of the main cylinder 25, the rotation moment generated due to the mismatch also acts on the movable claw 31. As described above, the rotational moment acting on the movable claw 31 is not small, and particularly in the large-sized pile press-fitting machine 1, a considerably large rotational moment acts on the movable claw 31 at the time of self-propelling or press-fitting/pulling-out the pile P. become.

However, in the pile press-fitting machine 1, the movable claw 31 is held inside the guide surface 45 in a state where the entire peripheral surface of the movable claw 31 is covered by the guide surface 45, and the claw side of the movable claw 31 is provided. The flat surface portions 40, 40 and the guide-side flat surface portions 46, 46 of the guide surface 45 are in close contact with each other. Therefore, the movable claw 31 is constrained to be non-rotatable inside the guide surface 45, and the rotational moment acting on the movable claw 31 is generated between the claw-side flat surface portions 40, 40 and the guide-side flat surface portions 46, 46. Due to the close contact, it is transmitted from the movable claw 31 to the collar member 47 and further to the casing chuck 22. For this reason, when the pile press-fitting machine 1 is self-propelled or when the pile P is press-fitted/pulled out, the rotation moment acting on the movable claw 31 can be received by the entire casing chuck 22.

Further, the movable claw 31 has the claw-side flat surface portions 40, 40 in close contact with the pair of left and right guide-side flat surface portions 46, 46 inside the guide surface 45, so that the movable claw 31 is disposed between the pair of left-right guide-side flat surface portions 46, 46. Since it is sandwiched from both sides, the rotational moment acting on the movable claw 31 is transferred from the movable claw 31 to the collar member 47 through the entire surfaces of the claw-side flat surface portions 40, 40 and the guide-side flat surface portions 46, 46. Therefore, it is possible to avoid the problem that the rotation moment is concentrated and acts on one place, which is a concern when a conventional rotation preventing means such as a key is used. The key transmits the rotational moment in the same way, but the surface pressure can be made smaller than that of the key.

As a result, wear and deformation between the claw-side flat surface portion 40 formed on the movable claw 31 and the guide-side flat surface portion 46 formed on the guide surface 45 can be minimized, and the rotation of the movable claw 31 can be effectively prevented. It becomes possible. Even when the movable pawl 31 is effectively prevented from rotating in this way, the movable pawl 31 smoothly slides inside the guide surface 45 due to the operation of the hydraulic cylinder 32 and approaches the fixed pawl 30. It is possible to separate. Further, compared to the conventional key groove structure, the claw-side flat surface portion 40 and the guide-side flat surface portion 46 need only form a flat surface, and are easy to process.

Further, in the pile press-fitting machine 1, the guide surface 45 is formed on the collar member 47, and the collar member 47 is detachable from the casing chuck 22 and can be replaced as appropriate. Therefore, even if the claw-side flat surface portion 40 or the guide-side flat surface portion 46 is worn or deformed, by replacing the movable claw 31 and the collar member 47 with new ones, the pile press-fitting machine 1 is self-propelled. It is possible to avoid the problem that the movable claw 31 rotates during press-fitting/pulling-out of the pile P and the running cost can be reduced.

The movable claw 31 is connected to the tube 35, and as shown in FIGS. 4, 5, 7, and 8, the entire rear end of the movable claw 31 is pushed by the tip surface of the tube 35. Therefore, the movable claw 31 does not tilt when the slide movement is performed inside the guide surface 45, and the horizontal posture is maintained.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this example. It is obvious to those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and of course, the technical scope of the present invention is also applicable to them. Understood to belong to.

For example, in the embodiment of the present invention described above, the pawl-side flat portions 40 are formed on the left and right of the movable pawl 31, and the guide-side flat portions 46 are formed on the left and right of the guide surface 45. However, as shown in FIG. 11, for example, a pair of claw-side flat portions 40 may be formed above and below the movable claw 31, and similarly, a pair of guide-side flat portions 46 may be formed above and below the guide surface 45. .. Further, for example, as shown in FIG. 12, a pair of claw-side flat portions 40 are formed on the upper, lower, left, and right sides of the movable claw 31, and similarly, a pair of guide-side flat portions 46 are formed on the upper, lower, left, and right sides of the guide surface 45. It may be. Further, the claw-side flat surface portion 40 may be formed on only one of the left and right sides of the movable claw 31, and similarly, the guide-side flat surface portion 46 may be formed on only one of the left and right sides of the guide surface 45. Further, the claw-side flat portion 40 may be formed only on one of the upper and lower sides of the movable claw 31, and similarly, the guide-side flat portion 46 may be formed on only one of the upper and lower sides of the guide surface 45.

Although the U-shaped steel sheet pile is shown as an example of the pile P in the above, the present invention can be applied to a pile press-fitting machine for press-fitting other piles such as a hat-type steel sheet pile and a concrete sheet pile.

INDUSTRIAL APPLICABILITY The present invention can be applied to a pile press-fitting machine that performs construction for press-fitting a pile into the ground and construction for pulling out the pile from the ground.

1 Pile press-in machine P pile 10 Saddle 11 Clamp 12 Fixed claw 13 Movable claw 15 Slide frame 16 Leader mast 17 Lift guide 20 Chuck 21 Chuck frame 22 Casing chuck 25 Main cylinder 26 Opening 30 Fixed claw 31 Movable claw 32 Hydraulic cylinder 35 Tube 36 Rod 37, 38 Circuit 40 Claw Side Plane Section 41 Hose Groove 45 Guide Surface 46 Guide Side Plane Section 47 Color Member 50 Flange

Claims (5)

A pile press-fitting machine that grips a pile with a chuck and press-fits it into the ground.
The chuck includes a movable claw and a fixed claw arranged to face each other to grip the pile,
The movable claw is held in the guide surface such that the peripheral surface of the movable claw is non-rotatably restrained so that the movable claw can approach and separate from the fixed claw.
A pile press-fitting machine comprising a pressing mechanism for moving the movable claw toward and away from the fixed claw. A claw-side flat surface portion is formed on the peripheral surface of the movable claw,
The pile press-fitting machine according to claim 1, wherein the guide surface has a guide-side flat surface portion facing the claw-side flat surface portion. A pair of the claw-side flat portions are formed at positions opposite to each other on the peripheral surface of the movable claw,
The pile press-fitting machine according to claim 2, wherein the guide surface is also formed with a pair of guide-side flat surface portions facing the claw-side flat surface portion. A collar member formed with the guide surface,
The pile press-fitting machine according to any one of claims 1 to 3, wherein the collar member is replaceably attached to the chuck. The pressing mechanism is a hydraulic cylinder containing a rod inside a tube,
The pile press-fitting machine according to any one of claims 1 to 4, wherein the movable claw is connected to the tube.

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