JP6502736B2 - Pile press-in method and pile press-in device - Google Patents

Description

  The present invention relates to a technique for press-fitting a pile into the ground.

  As a method of driving the pile into the ground and burying it, the upper end of the existing pile embedded in the ground is gripped with a clamp to take a reaction force, and the chuck holding the pile is moved up and down to create a new pile adjacent to the existing pile. Construction techniques are known in which the The pile press-in device used for such construction has a saddle fixed to the existing pile via a clamp, and a slide frame movable in the longitudinal direction with respect to the saddle, and the slide frame has a leader mast and a chuck The chuck is attached through the frame. Further, the chuck is provided with an opening through which a pile to be press-fitted is inserted in the vertical direction, and a pair of chuck claws for holding the pile passed through the opening. Then, a pile vertically inserted into the opening of the chuck is held by a pair of chuck claws, the chuck is positioned at a predetermined position with respect to the saddle, and the chuck frame and the chuck are integrated along the leader mast. The piles are pressed into the ground.

  For example, steel sheet piles and concrete sheet piles are known as piles used for press-fitting. These steel sheet piles and concrete sheet piles have various shapes and sizes, and the piles passed through the opening of the chuck may be wide or narrow.

  Conventionally, in the case of press-fitting piles having different widths, it has been fundamental to use a dedicated pile press-in device provided with chucks each having a different inner dimension of the opening depending on the width of the piles. For example, in the case of constructing a large pile, a pile press-in device provided with a relatively large chuck having a large width in the front-rear direction of the opening is used, and in the case of constructing a small pile, the front and rear of the opening A pile press-in device with a relatively small chuck with a narrow directional width is used.

  The reason for changing the pile press-in device according to the width of the pile in this manner will be specifically described with reference to the drawings. FIG. 9 (a) is a side view of the pile press-in device 100 used exclusively for the construction of a large width pile U1, and FIG. 9 (b) is a plan view of the same pile press-in device 100. FIG. 10 (a) is a side view of the pile press-in device 110 used exclusively for constructing the small-width pile U2, and FIG. 10 (b) is a plan view of the same pile press-in device 110. There are various types of piles, but here, U-shaped steel sheet piles will be described as an example. Further, although the width of the pile is relatively determined, as an example, the width B1 of the large pile U1 is 600 mm, and the width B2 of the small pile U2 is 400 mm.

  First, to describe the pile press-in device 100 for constructing the pile U1 having a large width, as shown in FIGS. 9A and 9B, the saddle 102 is fixed to the existing pile U1 'by the clamp 101. Then, the chuck 106 holding the pile U1 having a large width is positioned at a predetermined position in front of the saddle 102 through the slide frame 103, the reader mast 104, and the chuck frame 105. In this case, the horizontal distance L from the front end of the leading existing pile U1 'to the central axis O-106 of the chuck 106 is approximately half of the width B1 of the pile U1, for example, 600 mm / 2 = 300 mm. In addition, a clearance C is formed between the rear end of the chuck 106 thus positioned and the front end of the saddle 102, and the chuck 106 can move up and down without interfering with the saddle 102.

  Similarly, to describe the pile press-in device 110 for constructing the small-width pile U2, as shown in FIGS. 10A and 10B, the saddle 112 is fixed to the existing pile U2 'by the clamp 111. Then, the chuck 116 holding the pile U 2 having a small width is positioned at a predetermined position in front of the saddle 112 via the slide frame 113, the reader mast 114, and the chuck frame 115. In this case, the horizontal distance L from the front end of the leading existing pile U2 'to the central axis O-116 of the chuck 116 is approximately half of the width B2 of the pile U2, for example, 400 mm / 2 = 200 mm. In addition, a clearance C is formed between the rear end of the chuck 116 thus positioned and the front end of the saddle 112, and the chuck 116 can move up and down without interfering with the saddle 112.

  In any of the pile press-in devices 100 and 110, the front is the direction in which the press-in work is advanced by the pile press-in devices 100 and 110, as shown in FIGS. 9 (a), (b), 10 (a), In (b) and FIGS. 11A and 11B described later, the right side in the drawing is the front, and the left side in the drawing is the rear. The left-right direction is determined in a state in which the advancing direction of the press-fitting work is viewed from above, and in FIGS. 9B, 10B and 11B described later, the lower side of the drawing is the right side. The side is the left side.

  In these pile press-in devices 100, 110, the dimensions of the chucks 106, 116 are set to be commensurate with the sizes of the respective piles U1, U2 to be constructed. That is, in the chuck 106 of the pile press-in device 100 for constructing the pile U1 having a large width, an opening 107 whose inner dimension in the front-rear direction is appropriately set larger than the width B1 (for example, 600 mm) of the pile U1 is formed There is. Similarly, an opening 117 is formed in the chuck 116 of the pile press-in device 110 for constructing the pile U2 having a small width, in which the internal dimension in the front-rear direction is appropriately set larger than the width B2 (eg 400 mm) of the pile U2. ing. Further, the outer size of the chuck 106 of the pile press-in device 100 for constructing the pile U1 having a large width according to the size of the openings 107 and 117 is larger than the outer size of the chuck 116 of the pile press-in device 110 for constructing a pile U2 having a small width. Inevitably larger.

  As described above, since the chucks 106 and 116 of the pile press-in devices 100 and 110 are designed based on the sizes of the respective piles U1 and U2, the chucks 116 of the pile press-in device 110 for constructing the small-width pile U2 In the opening 117, the large pile U1 can not be passed. For this reason, pile press-fit apparatus 110 which constructs small width U2 can not be used for construction of large width U1.

  On the other hand, it is possible to pass pile U2 with a small width to opening part 107 of zipper 106 of pile press fit device 100 which constructs pile U1 with a large width. However, when attempting to press in a small-width pile U2 using a pile press-in device 100 having a chuck 106 with a large outer size, the following problems occur.

  FIG. 11 (a) is a side view showing a state in which the small-width pile U2 is to be press-fitted by using the pile press-in device 100 having the chuck 106 having a large outer size, and FIG. 11 (b) is the same. It is a top view of a state. As described above, since the chuck 106 of the pile press-in device 100 is designed to match the width B1 (eg, 600 mm) of the pile U1, the length in the front-rear direction of the chuck 106 is the pile U2 having a small width It is considerably larger than the length in the front-rear direction of the chuck 116 of the pile press-in device 110 to be constructed.

  However, even in the case of using the pile press-in device 100 for constructing the pile U1 having a large width, in order to press-fit the pile U2 having a small width, the central axis O of the chuck 106 from the front end of the existing pile U2 'at the head. The horizontal distance L up to −106 needs to be set to approximately half the width B2 of the pile U2. The chuck 106 must be positioned close to the saddle 102 so that the horizontal distance L is, for example, 400 mm / 2 = 200 mm. However, because the chuck 106 has a large outer size, when it approaches the saddle 102 so that the horizontal distance L is 200 mm, the clearance C between the rear end of the chuck 106 and the front end of the saddle 102 disappears. It interferes with the construction and can not be constructed.

  For this reason, conventionally, chucks having different sizes are basically provided according to the width of the pile, except when it can be constructed using a common pile press-in device exceptionally where the difference in pile width is small. Construction was done using the pile press-in device. As a result, a plurality of pile press-in devices corresponding to the width of the pile become necessary, causing a problem of poor versatility and economy.

  On the other hand, in order to solve such a problem, Patent Document 1 prepares a plurality of chucks according to the width of the pile, and by appropriately configuring the plurality of chucks with respect to the chuck frame, the width of the pile Means for responding to changes in According to this prior art, it is supposed that various piles can be chucked by replacing and using a plurality of chucks with one pile press-in device.

JP, 2011-226209, A

  However, according to the means of Patent Document 1, it is necessary to prepare a plurality of chucks, and there is a problem that the number of parts increases and the cost increases, and since there are many replacement parts, their storage space is also required. Moreover, since the whole chuck | zipper is replaced | exchanged, the parts to replace | exchange are considerable heavy items, and there existed a problem that an exchange operation takes time and effort and time.

  An object of the present invention is to make it possible to construct piles of different widths by means of a common pile press-in device with as little effort as possible.

In order to achieve the above object, according to the present invention, the upper end of the existing pile embedded in the ground is clamped by a clamp to take a reaction force, and the chuck holding the pile is lowered to be adjacent to the existing pile The chuck is provided with an opening for inserting the pile in the vertical direction, and a pair of chuck claws for holding the pile passed through the opening, and the chuck The pile press-in method is provided in which the position of the pile in the inside of the opening is changed in the front-rear direction toward the direction in which the press-in work is progressed by the width of the pile gripped.

  In the pile press-fitting method of the present invention, the position of the pile to be press-fit with respect to the front end of the existing pile can be adjusted by changing the position of the pile gripped by the chuck in the front-rear direction. Thus, by changing the position of the pile in the opening of the chuck in the front-rear direction, for example, the pile to be press-fit is maintained at the front end of the existing pile while maintaining the clearance between the rear end of the chuck and the front end of the saddle. It becomes possible to make it adjacent.

An example of a pile press-fitting method of the present invention, by the chuck, pile of pile and a small width of the relatively large width is grasped, when gripping a pile of large width by the chuck, the inside of the opening the stakes were placed in the center of the longitudinal direction, when gripping the pile of small width by the chuck, placing a pile behind the longitudinal direction in the interior of the opening.

In this case, when the front-rear direction of the width of the contact surface is pressed against the side surface of the pile, providing a chuck jaws of the chuck claws and a small width of the relatively large width, to grip the pile of large width by the chuck When the chuck jaws having a large width are used and the pile having a small width is gripped by the chuck, the chuck jaws having a small width may be used. The center position of the contact surface is pressed against the side surface of the pile, and the standard pawl matching the center the inside longitudinal direction of the opening, an offset pawl are shifted in the longitudinal direction in the interior of the opening A standard claw may be used when preparing a pile having a large width by the chuck, and an offset claw may be used when holding a pile having a small width by the chuck. By appropriately replacing and using the chuck claws having different widths and center positions in the front and rear direction of the contact surface as described above, it is possible to easily cope with changes in the width and the front and rear direction of the pile gripped by the chuck.

According to the present invention, there is provided a pile press-device used in the pile press-process, as the chuck claws, the longitudinal width of the contact surface opposed to the side face of the piles, relatively large width of the chuck jaws There is provided a pile press-in device having a small width chuck claw, and in which the large width chuck claw and the small width chuck claw are exchangeably attached to the chuck. Also, a pile press-device used in the pile press-process, the as chuck jaws, the center position of the contact surface facing the side surface of the pile, a standard pawl matching the center the inside longitudinal direction of the opening When, an offset pawl are shifted in the longitudinal direction in the interior of the opening, said chuck, standard nail and offset pawl is mounted interchangeably, pile indentation device is provided.

  According to the present invention, by changing the position of the pile gripped by the chuck in the front-rear direction, it becomes possible to construct piles having different widths by a common pile press-in device with little labor without replacing the chuck. . In addition, it is possible to cope with changes in the width of the pile gripped by the chuck and the position in the front-rear direction only by exchanging the chuck claws, with few replacement parts and easy replacement work.

It is the schematic which shows the case where a pile with a large width is constructed by the pile pressing-in apparatus which concerns on embodiment of this invention, (a) is a side view, (b) is a top view. In order to facilitate the description of the positional relationship between the saddle and the chuck, the slide frame, the reader mast and the chuck frame are omitted in FIG. It is explanatory drawing of a chuck | zipper, (a) is a top view, (b) is a fragmentary sectional view in XX. It is a top view of the chuck claw which concerns on embodiment of this invention, (a) is a chuck claw (standard claw) of a large width, (b) is a chuck claw (standard claw) of a small width, (c) is an offset claw. It is. It is the schematic which shows the case where a small pile is built by the pile press-fit apparatus concerning embodiment of this invention, (a) is a side view, (b) is a top view. In addition, in order to make it easy to demonstrate the positional relationship of a saddle and a chuck | zipper, in FIG.4 (b), a slide frame, a reader mast, and a chuck | zipper frame are abbreviate | omitted and shown. It is explanatory drawing of the chuck which hold | gripped the pile (U-shaped steel sheet pile) of large width. It is an explanatory view of a chuck which grips a small width pile (U-shaped steel sheet pile). It is explanatory drawing of the chuck which hold | gripped the pile (Z shaped steel sheet pile) of large width. It is an explanatory view of a chuck which grips a small width pile (Z-shaped steel sheet pile). In a prior art, it is explanatory drawing of a pile press-fit apparatus used when constructing a pile with a large width | variety, (a) is a side view, (b) is a top view. In order to facilitate the description of the positional relationship between the saddle and the chuck, the slide frame, the reader mast, and the chuck frame are omitted in FIG. In a prior art, it is explanatory drawing of the pile press-fit apparatus used when constructing a small width | variety pile, (a) is a side view, (b) is a top view. In addition, in order to make it easy to demonstrate the positional relationship of a saddle and a chuck | zipper, in FIG.10 (b), a slide frame, a reader mast, and a chuck | zipper frame are abbreviate | omitted and shown. In the prior art, it is an explanatory view showing a problem when trying to press in a small width pile by means of a pile press-in device used when constructing a wide width pile, (a) is a side view, (b) Is a plan view. In order to facilitate the description of the positional relationship between the saddle and the chuck, the slide frame, the leader mast, and the chuck frame are omitted in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and the drawings, elements having substantially the same functional configuration will be assigned the same reference numerals and redundant description will be omitted. Also, as an example in which a pile having a large width and a pile having a small width are pressed in using the same pile press-in device 1, a form in which a pile U1 made of U-shaped steel sheet piles having a large width is pressed in FIG. The form which press-fits pile U2 which consists of a U-shaped steel sheet pile of width is explained. In addition, although the magnitude of the width of the pile is relatively determined, as an example, the width B1 of the large pile U1 is 600 mm, and the width B2 of the small pile U2 is 400 mm.

  First, the form which press-fits pile U1 of a large width is explained. As shown in FIGS. 1 (a) and 1 (b), in the pile press-in device 1 according to the embodiment of the present invention, a plurality of clamps 11 are mounted below the saddle 10 serving as the device body. In this embodiment, four clamps 11 are mounted in the front and rear direction, and the positional relationship of each clamp 11 on the lower surface of the saddle 10 is appropriately changed to the front, rear, left and right. The clamp 11 has a function of holding the upper end of the existing pile U1 'previously embedded in the ground by driving a hydraulic cylinder (not shown) to fix the saddle 10 and taking a reaction force of press-fitting.

  In addition, the front is a direction in which the press-fitting work is advanced by the pile press-in device 1. In FIGS. 1A and 1B, the right side in the drawing is the front and the left side in the drawing is the rear. The left-right direction is determined in a state where the advancing direction of the press-fitting work is viewed from above, and in FIG. 1B, the lower side of the drawing is the right side and the upper side of the drawing is the left. The same applies to FIGS. 4A and 4B described later.

  A leader mast 13 is mounted on the upper surface of the saddle 10 via a slide frame 12 movable in the front-rear direction, and a chuck frame 14 and a chuck 15 are disposed in front of the leader mast 13. By moving the slide frame 12 in the front-rear direction on the upper surface of the saddle 10, the chuck frame 14 and the chuck 15 are integrally moved back and forth, and the chuck frame 14 and the chuck 15 are raised and lowered by the operation of the main cylinder 16. The chuck 15 is configured to be rotatable on the lower surface of the chuck frame 14.

  The chuck 15 is provided with an opening 20 through which the pile U1 is inserted in the vertical direction, and a pair of chuck claws 21 and 22 which grip the pile U1 passed through the opening 20. As shown in FIGS. 2A and 2B, one chuck claw 21 is a movable claw fixed to a movable portion of a cylinder 25 mounted on the chuck 15 by a bolt 26. The other chuck claw 22 is a fixed claw directly fixed to the chuck 15 by a bolt 27. In this embodiment, the chuck claws 21 to be movable claws are driven by two cylinders 25 arranged vertically.

  In this embodiment, as shown in FIG. 3A, the chuck claws 21a, 22 have a relatively large width in the front-rear direction of the contact surface pressed against the side surface of the pile. , 22a and as shown in FIG. 3 (b), tapered chuck claws 21b and 22b are set such that the width in the front-rear direction of the contact surface pressed against the side surface of the pile is relatively small; As shown in (c), there are chuck claws 21c and 22c (offset claws) in which the center position of the contact surface pressed against the side surface of the pile is shifted in the front-rear direction. 3 (a) to 3 (c) show the state as seen from the reception of the pair of chuck claws 21 and 22, respectively. The chuck claws 21a and 22a shown in FIG. 3 (a) and the chuck claws 21b and 22b shown in FIG. 3 (b) are standard claws in which the center position of the contact surface facing the side of the pile coincides with the center in the front and rear direction. is there.

  When press-fitting a pile U1 having a large width by the pile press-in device 1 configured as described above, as shown in FIGS. 1 (a) and 1 (b), the chuck claws 21 and 22 are formed on the side of the pile. The chuck claws 21 a and 22 a whose width in the front-rear direction of the contact surface to be pressed is set large are attached to the chuck 15. Then, the pile U1 is vertically inserted into the opening portion 20 of the chuck 15, and the pile U1 is gripped by the chuck 15 by pressing the side surfaces (webs) of the pile U1 from both right and left sides by the pair of chuck claws 21a and 22a. The holding of the pile U1 operates the cylinder 25 mounted on the chuck 15, and presses the chuck claw 21a, which is a movable claw, toward the chuck claw 22a, which is a fixed claw, so that the tip surfaces of the chuck claws 21a and 22a (contact This is performed by holding the side surface (web) of the pile U1 between the faces).

  When holding the pile U1 having a large width to the chuck 15 as described above, the pile U1 is disposed at the center in the front-rear direction inside the opening 20, and the central axis O-15 of the chuck 15 in the front-rear direction The central axis O-U1 of the pile U1 is in the same position. As a result, the pile U1 having a large width can be passed through the opening 20 of the chuck 15.

  Then, in a state where the saddle 10 is fixed to the existing pile U1 ', the slide frame 12 moves in the front-rear direction, and the chuck 15 holding the pile U1 is positioned at a predetermined position in front of the saddle 10. In this case, the horizontal distance L from the front end of the leading existing pile U1 'to the central axis O-15 of the chuck 15 is approximately half the width B1 of the pile U1, and is, for example, 600 mm / 2 = 300 mm. If the horizontal distance L from the front end of the existing pile U1 ′ to the central axis O-15 of the chuck 15 is about 300 mm, a sufficient clearance C is formed between the rear end of the chuck 15 and the front end of the saddle 10. Ru.

  In this way, with the pile U1 positioned at a predetermined position, the chuck frame 14 and the chuck 15 are integrally raised and lowered by the operation of the main cylinder 16, and when the pile U1 is gripped by the chuck 15 when it is lowered The pile U1 is pressed into a position adjacent to the front end of the existing pile U1 ′ by releasing the grip. In this case, since a sufficient clearance C is formed between the rear end of the chuck 15 and the front end of the saddle 10, the chuck 15 can move up and down without interfering with the saddle 10, and the construction can be smoothly performed.

  Next, the form which press-fits pile U2 of small width is explained. An object of the present invention is to easily press-fit piles U1 and U2 with different widths using a common pile press-in device 1. Accordingly, the pile press-in device 1 shown in FIGS. 4 (a) and 4 (b) is the same as the pile press-in device 1 described in FIGS. 1 (a) and 1 (b). However, in the pile press-in device 1 shown in FIGS. 4 (a) and 4 (b), the chuck claws 21 and 22 have chuck jaws 21b whose width in the front-rear direction of the contact surface pressed against the side of the pile is small. 22b is attached to the chuck 15. Further, the positional relationship between the clamps 11 on the lower surface of the saddle 10 is appropriately changed to the front and rear and right and left corresponding to the existing pile U2 'having a small width, and similarly the grip 11 holds the saddle 10 by gripping the upper end of the existing pile U2'. Fix and take the reaction force of press fit.

  Similarly, when the pile U2 having a small width is press-fitted by the pile press-in device 1 configured as above, the pile U2 is vertically inserted through the opening 20 of the chuck 15 and the side surface (web) of the pile U2 is The pile U <b> 2 is gripped by the chuck 15 by holding the pile U <b> 2 from the left and right sides by the pair of chuck claws 21 b and 22 b. The grip of the pile U2 operates the cylinder 25 mounted on the chuck 15, and presses the chuck claw 21b, which is a movable claw, toward the chuck claw 22b, which is a fixed claw, and the tip surfaces of the chuck claws 21b and 22b (contact It is carried out by holding the side surface (web) of the pile U2 between the faces).

  And when holding the pile U2 of a small width to the chuck 15 in this way, the pile U2 is disposed at the rear in the front-rear direction inside the opening 20, and the central axis O-U2 of the pile U2 is in the front-rear direction It is made to be behind the central axis O-15 of the chuck 15. In addition, since the opening 20 of the chuck 15 has a size capable of inserting the pile U1 having a large width, in the case of the pile U2 having a small width, the arrangement is made to move backward inside the opening 20 in this manner. It is possible.

  Further, in a state where the saddle 10 is fixed to the existing pile U2 ', the slide frame 12 moves in the front-rear direction, and the chuck 15 gripping the pile U2 is positioned at a predetermined position in front of the saddle 10. In this case, the distance between the front end of the first existing pile U2 'and the central axis O-U2 of the pile U2 at the rear of the inside of the opening 20 may be 200 mm. The distance L to the central axis O-15 may be greater than 200 mm. For this reason, the moving distance of the chuck 15 to the rear can be reduced, and a clearance C can be secured between the rear end of the chuck 15 and the front end of the saddle 10.

  Further, when holding the pile U2 having a small width, by using the tapered chuck claws 21b and 22b in which the width in the front-rear direction of the contact surface is set small, a small width can be obtained inside the opening 20 of the chuck 15. Even if the pile U2 is gripped in a state of being shifted backward, the flange of the pile U2 does not interfere with the contact of the chuck claws 21b and 22b with the web of the pile U2.

  On the other hand, from the viewpoint of workability, it is desirable to dispose the pile U2 at the center of the opening 20 of the chuck 15 even if the pile U2 has a small width. However, the pile press-in device 1 has an ability to press-in the pile U1 having an inherently large width. For this reason, even if the pile U2 is gripped in the opening 20 of the chuck 15 by being shifted backward to grip the pile U2, the pile U2 having a small width can be applied without any problem. For this reason, there is no problem even if the pile U2 is shifted backward and gripped. Further, as shown in the embodiment, by driving the two chucks 25 in which the chuck claws 21 serving as the movable claws are vertically disposed, the pile U2 shifted rearward can be firmly gripped.

  Therefore, according to the embodiment described above, the pile press-in device 1 capable of press-fitting the pile U1 having a large width by appropriately changing the positions of the piles U1 and U2 gripped by the chuck 15 in the front-rear direction Therefore, it becomes possible to construct a small width pile U2, and the versatility of the pile press-in device 1 is improved and is economical. In addition, since the large-width pile U1 and the small-width pile U2 can be handled simply by exchanging the chuck claws 21 and 22, the exchanging operation is extremely easy, and the number of replacement parts can be reduced.

  As mentioned above, although an example of an embodiment of the invention was explained, referring to an accompanying drawing, the present invention is not limited to this example. It is obvious that those skilled in the art can conceive of various modifications or alterations within the scope of the idea described in the claims, and they are naturally within the technical scope of the present invention. It is understood that.

  For example, in FIGS. 1A and 1B and FIGS. 4A and 4B, chuck claws 21a and 22a, which are standard claws having a large contact surface width, and standard claws having a small contact surface width, are used. An example of exchanging the chuck claws 21b and 22b has been described, but when gripping the pile U2 having a small width, the chuck claw 21c in which the center position of the contact surface as shown in FIG. 22c (offset claw) may be used. FIG. 5 is an explanatory view of the chuck 15 in which the pile U1 having a large width is gripped using the chuck claws 21a and 22a (standard claws) in which the width of the contact surface is set large. On the other hand, FIG. 6 is an explanatory view of a chuck 15 holding a pile U2 of a small width using chuck claws 21c and 22c (offset claws) whose center position of the contact surface is shifted in the front-rear direction. When gripping the pile U2 of a small width, the chuck claws 21c, 22c (offset claws) such that the central positions of the contact surfaces of the chuck claws 21c, 22c (offset claws) are displaced backward inside the opening 20 of the chuck 15. Put on). As a result, it becomes possible to easily grip the pile U2 having a small width in the inside of the opening 20 of the chuck 15 while being shifted rearward. The chuck claws 21 and 22 may be replaced with only one of the one chuck claw 21 (movable claw) and the other chuck claw 22 (fixed claw).

  Moreover, although pile U1 and pile U2 which consist of a U-shaped steel sheet pile were demonstrated to the example above, even if it is another pile, this invention is applicable similarly. For example, FIG. 7 is an explanatory view of a chuck 15 holding a pile Z1 formed of a Z-shaped steel sheet pile having a large width using chuck claws 21a and 22a (standard claws) in which the width of the contact surface is set large. FIG. 8 is an explanatory view of a chuck 15 holding a pile Z2 formed of a Z-shaped steel sheet pile with a small width using chuck claws 21c and 22c (offset claws) whose center position of the contact surface is shifted in the front-rear direction. Also in this case, the chuck claws 21c and 22c (offset claws) are mounted so that the central positions of the contact surfaces of the chuck claws 21c and 22c (offset claws) are shifted backward inside the opening 20 of the chuck 15. As a result, it becomes possible to easily grip the pile Z2 having a small width in the inside of the opening 20 of the chuck 15 while being shifted rearward. Further, the present invention can be similarly applied to not only U-shaped steel sheet piles and Z-shaped steel sheet piles but also hat-shaped steel sheet piles (zero sheet piles), H-shaped steel sheet piles, straight steel sheet piles, concrete sheet piles and the like. Also, not only when the same type of piles have different widths, but, for example, U-shaped steel sheet piles and Z-shaped steel sheet piles, piles in the opening of the chuck corresponding to the respective widths of different kinds of piles. The aspect which changes a position to the front-back direction also belongs to the technical scope of this invention.

  Further, although the case has been described above in which the chuck is lowered to press-fit the pile, the present invention is also applicable to the case where the pile is pulled out of the ground by holding the existing pile and raising the chuck. is there.

  The present invention is useful in the field of construction where a pile is pressed into the ground.

U1 Large width pile U2 Small width pile U1 ', U2' Existing pile 1 Pile press-in device 10 Saddle 11 Clamp 12 Slide frame 13 Leader mast 14 Chuck frame 15 Chuck 16 Main cylinder 20 Opening part 21 22, Chuck claw 25 Cylinder 26 , 27 volts

Claims (6)

The pile press-in method of pressing a pile to a position adjacent to the existing pile by holding the upper end of the existing pile embedded in the ground with a clamp and taking a reaction force, and lowering the chuck holding the pile,
The chuck is provided with an opening through which a pile is inserted in the vertical direction, and a pair of chuck claws for holding the pile passed through the opening.
Depending on the width of the pile gripped by the chuck, the position of the pile inside the opening is
The pile press-fit method, which is changed in the front-back direction toward the direction in which the press-fit construction proceeds . The chuck holds a relatively large width pile and a small width pile;
When gripping a pile of large width by the chuck, when the pile is placed in the center the longitudinal direction of the inside of the opening, grip the pile of small width by the chuck, the inside of the opening The pile press-fit method according to claim 1, wherein the pile is disposed at the rear in the front-rear direction. The longitudinal width of the contact surface is pressed against the side surface of the pile, providing a chuck jaws of the chuck claws and a small width of the relatively large width,
The pile press-in according to claim 2, wherein when holding a pile having a large width by the chuck, a chuck claw having a large width is used, and when holding a pile having a small width using the chuck, a chuck claw having a small width is used. Method. The center position of the contact surface is pressed against the side surface of the pile, prepared and the standard pawl matching the center the inside longitudinal direction of the opening, an offset pawl are shifted in the longitudinal direction in the interior of the opening ,
The pile press-fit method according to claim 2, wherein a standard claw is used when holding a pile having a large width by the chuck, and an offset claw is used when holding a pile having a small width by the chuck. A pile press-in apparatus used for the pile press-in method according to claim 1, wherein
The longitudinal width of the contact surface facing the side surface of the pile has a chuck jaws of the chuck claws and a small width of the relatively large width,
The pile press-fit device in which a large width chuck claw and a small width chuck claw are exchangeably attached to the chuck. A pile press-in apparatus used for the pile press-in method according to claim 1, wherein
The center position of the contact surface facing the side surface of the pile has a standard pawl matching the center the inside longitudinal direction of the opening, an offset pawl are shifted in the longitudinal direction in the interior of the opening,
The pile press-fit device in which a standard claw and an offset claw are exchangeably attached to the chuck.

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