JP6347324B2 - Pile construction jig and rotation pile construction method - Google Patents

Description

  The present invention relates to a pile construction jig used when a rotary pile is rotated and penetrated into the ground, and a rotary pile constructed by the pile construction jig.

  Conventionally, rotating piles (steel pipe piles) installed to support the upper structure of civil engineering structures such as buildings, roads, railway viaducts, abutments, and steel towers, and to prevent landslides. It has been known.

  For example, as shown in Patent Document 1, such rotating piles are provided with protrusions (engaging portions) called coma protruding radially outward on the inner peripheral surface and the outer peripheral surface. And by receiving the rotational force of a construction apparatus with this protrusion, a rotational force can be transmitted to a rotary pile from a construction apparatus.

JP 2008-169618 A

  However, such protrusions are generally provided by welding to a steel pipe of a raw pipe. For this reason, the effort which joins a protrusion is needed and it has led to the cost increase. Furthermore, when joining protrusions by welding, there is a problem that the steel pipe needs to have a certain thickness and the material cost and weight increase. For this reason, the method of enabling rotation penetration of a rotary pile without providing such a protrusion is calculated | required.

  The present invention has been made in view of the above-described circumstances, and has a simple structure, can be easily attached to a rotating pile, and a pile construction jig capable of rotating through the rotating pile, and this A rotating pile constructed by a pile construction jig is provided.

The present invention employs the following means in order to solve the above problems.
That is, the pile construction jig according to an aspect of the present invention is a pile construction jig for rotating and penetrating a rotary pile having a tubular shaft portion into the ground, and is divided into a plurality of pieces in the circumferential direction of the shaft portion. A tubular member is formed as a whole with the outer divided pieces formed, and the outer cover that covers the shaft portion from the outside and can come into contact with the shaft portion and the outer divided pieces are tightened in a direction close to each other. A fastening portion for applying a tightening force; and provided on the outer surface of the outer divided piece integrally with the outer divided piece, projecting toward a radially outer side of the shaft portion at a part in a circumferential direction of the shaft portion, A top part that receives a rotational force from a construction device that rotates and penetrates the rotary pile, and a shaft part that is inserted inside the shaft part so as to be located inside the exterior body, from the inner side toward a radially outer side of the shaft part. And an interior body for applying a pressing force to the shaft portion .

  According to such a pile construction jig, the exterior body can be brought into close contact with the outer peripheral surface of the shaft portion by fastening the exterior body divided into a plurality by the fastening portion. Accordingly, a frictional force can be generated between the shaft part and the exterior body, and when the rotational force from the construction apparatus is applied to the exterior body, the frictional force causes a relative force between the shaft part and the construction apparatus. The rotation is restricted, and the rotational force from the construction device can be transmitted. Further, since the exterior body is composed of divided outer divided pieces, each outer divided piece is smaller and lighter than the entire exterior body when the exterior body is integrated, Attachment to the shaft is easy. Furthermore, the structure is simple and the manufacturing cost can be suppressed by using a simple divided exterior body.

  By providing such an interior body, it is possible to press the shaft portion from the inside, and by pressing the shaft portion against the exterior body, the adhesion between the shaft portion and the exterior body can be improved. Therefore, a larger frictional force can be generated between the shaft portion and the exterior body, and the rotational force from the construction apparatus can be transmitted to the shaft portion more effectively.

  The interior body may be capable of adjusting the pressing force.

  By adjusting the pressing force in this way, the shaft portion can be effectively brought into close contact with the exterior body without being affected by the dimensional accuracy of the shaft portion, and a frictional force can be generated between the shaft portion and the exterior body. Can be generated.

  Further, the inner body may apply the pressing force so that the pressing force acts in a direction different from the radial direction of the tightening force applied by the fastening portion.

  If the direction of the pressing force and the direction of the tightening force coincide with each other, the force concentrates only on the coincident portion, so that sufficient adhesion between the shaft portion and the exterior body is obtained. However, since the direction of the pressing force and the direction of the tightening force are different, the shaft portion and the exterior body can be more effectively brought into close contact with each other to generate a frictional force.

  Further, the inner body has an inner divided piece divided into a plurality in the circumferential direction of the shaft portion to form a tubular member as a whole and a contact portion that can contact the inner peripheral surface of the shaft portion; And a pressing portion that applies a pressing force that presses the inner divided pieces in a direction away from each other toward the radially outer side.

  Thus, by providing the contact portion as the interior body, it is possible to apply a pressing force over a wider range in the circumferential direction of the inner peripheral surface of the shaft portion. Moreover, since the contact part in an interior body is comprised by the divided | segmented inner division | segmentation piece, compared with the whole contact part when the contact part is united, each inner division | segmentation piece becomes small and light, The body can be easily transported and attached to the shaft. Furthermore, the structure is simple and the manufacturing cost can be reduced by using an interior body with a simple divided structure.

Furthermore, the construction method of the rotary pile according to one aspect of the present invention is a method of rotationally penetrating the rotary pile into the ground using the above pile construction jig, and pressing the shaft portion from the inside by the interior body. While the exterior body is tightened by the fastening portion, a rotational force is applied from the construction device to the top portion .

  According to such a rotary pile, by using a pile construction jig, a frictional force is generated between the shaft portion and the exterior body, and the rotational force from the construction device is transmitted by this frictional force. And while being easily attached to an axial part, rotation penetration is attained, suppressing manufacturing cost.

  According to the pile construction jig of claim 1, by providing the exterior body, it can be easily attached to the rotating pile with a simple structure, and the rotating pile can be rotated and penetrated.

Moreover, according to the pile construction jig of Claim 1, a rotary pile can be efficiently penetrated by providing an interior body.

Moreover, according to the pile construction jig of claim 2 , it is possible to rotate the rotary pile more efficiently.

Moreover, according to the pile construction jig of claim 3 , it is possible to rotate the rotary pile more efficiently.

Moreover, according to the pile construction jig of claim 4 , it is possible to rotate the rotary pile more efficiently.

Furthermore, according to the construction method of the rotary pile of Claim 5 , it is a simple structure, By using the pile construction jig which can be attached easily, it is easy to carry out rotation penetration.

It is a whole side view showing a pile construction jig concerning an embodiment of the present invention, and a rotation pile to which a pile construction jig was attached. It is a top view of a pile applicator according to an embodiment of the present invention. It is a side view of a pile application jig concerning an embodiment of the present invention. It is sectional drawing of the cross section orthogonal to the upper surface of the pile applicator and rotary pile which concern on embodiment of this invention, Comprising: The AA cross section of FIG. 2 is shown.

Hereinafter, the pile construction jig 1 of this embodiment will be described.
The pile construction jig 1 is a jig that is attached to the rotary pile 100 and rotates and penetrates the rotary pile 100 into the ground G.
Here, the rotary pile 100 rotated and inserted into the ground G in the present embodiment has a shaft portion 101 made of a steel pipe and a blade portion 102 provided on the outer peripheral surface 101 a of the shaft portion 101.

  The shaft portion 101 is, for example, a circular steel tube extending along the axis O, and the dimensions such as the outer diameter and the wall thickness are appropriately changed according to the design strength of the structure.

The blade portion 102 protrudes radially outward from the outer peripheral surface 101a of the shaft portion 101, and is formed to be twisted in the direction of the axis O from the distal end, which is the side where the shaft portion 101 is inserted into the ground G, toward the proximal end side. Is a spiral blade. In the present embodiment, the blade portion 102 is formed for one turn in the circumferential direction of the shaft portion 101 from the tip of the shaft portion 101.
The blade portion 102 may be formed over the entire region in the direction of the axis O of the shaft portion 101. Further, it may be formed at intervals so as to be discontinuous in the direction of the axis O.

  As shown in FIGS. 2 to 4, the pile construction jig 1 includes an exterior body 5 attached to the base end of the shaft portion 101 from the outside, a fastening portion 6 and a piece portion 7 provided on the exterior body 5, a shaft And an interior body 31 inserted inside at the base end of the portion 101.

The exterior body 5 has an outer divided piece 10 divided into a plurality (two in this embodiment) in the circumferential direction of the shaft portion 101, and the plurality of outer divided pieces 10 as a whole form a tubular member. ing.
Furthermore, the inner surface 10a of these outer divided pieces 10 is in contact with the outer peripheral surface 101a of the shaft portion 101 while being attached to the shaft portion 101, and the exterior body 5 and the shaft portion 101 are arranged coaxially.

  Here, in a state where the inner surface 10a of the outer divided piece 10 is in contact with the outer peripheral surface 101a of the shaft portion 101 and no external force is applied to the outer divided piece 10, the outer divided pieces 10 are separated from each other in the circumferential direction. A gap is formed between the outer divided pieces 10.

  The fastening portion 6 includes a fastening plate portion 12 protruding from each outer divided piece 10 toward the radially outer side of the exterior body 5, and fastening plate portions 12 in the outer divided piece 10 adjacent in the circumferential direction of the shaft portion 101. The bolt 15 and the nut 16 are fastened.

  The fastening plate portion 12 has a plate-like first plate 13 projecting radially outward over the entire region in the direction of the axis O at both ends in the circumferential direction of each outer divided piece 10, and the first plate 13 and the outer divided portion. It has the 2nd board 14 which makes | forms the plate shape provided in the corner part C formed between the outer surfaces 10b of the piece 10. FIG.

  The first plate 13 includes the first plate 13 in one of the outer divided pieces 10 adjacent in the circumferential direction and the first plate 13 in the other in a state where each outer divided piece 10 is attached to the shaft portion 101. Are arranged to face each other in the circumferential direction.

  Further, the first plate 13 is formed with a through hole 13 a penetrating in the plate thickness direction along the circumferential direction of the outer divided piece 10. The through hole 13a has substantially the same height in the direction of the axis O in a state where the first plate 13 in the one outer divided piece 10 and the first plate 13 in the other outer divided piece 10 face each other in the circumferential direction. It forms in each 1st board 13 so that it may be arranged in a position. In the present embodiment, three through-holes 13a are formed at equal intervals so as to be separated from each other in the direction of the axis O.

  The second plate 14 extends in the circumferential direction of the exterior body 5 so as to intersect with the first plate 13 (orthogonal in the present embodiment), and is a rib plate having a so-called rib function. Furthermore, the second plate 14 is provided with a plurality (four in this embodiment) spaced apart from each other in the direction of the axis O so as to sandwich the through holes 13a in the first plate 13 from both sides in the direction of the axis O. Yes.

  The end surface 22 facing the radially outer side of the second plate 14 is flush with the end surface 21 facing the radially outer side of the first plate 13. More specifically, in the present embodiment, the end surface 22 of the second plate 14 is continuous with the end surface 21 of the first plate 13, and a surface 22a extending in the tangential direction of the outer surface 10b of the outer divided piece 10, and the surface 22a. And a surface 22b that is inclined so as to be chamfered from the outside in the radial direction toward the inside in the direction away from the first plate 13.

The bolts 15 are inserted through the through holes 13a in the first plate 13 facing each other in the circumferential direction.
The nut 16 is screwed to the bolt to apply a tightening force F <b> 1 that tightens the first plates 13 facing each other in the circumferential direction in a direction close to each other. By such a tightening force F1, the outer divided pieces 10 are pulled so as to be close to each other.

  The top part 7 is provided over the entire area in the axis O direction integrally with the outer divided piece 10 so as to protrude radially outward from the outer divided piece 10. The top portions 7 are arranged one by one at an intermediate position in the circumferential direction between the first plates 13 in each outer divided piece 10. Therefore, in the present embodiment, the top portions 7 provided in the respective outer divided pieces 10 are arranged at positions spaced 180 degrees around the axis O in the circumferential direction.

  As shown in FIG. 1, the base end of the shaft portion 101 is provided so as to cover the cylindrical construction device 200, and the protrusion 201 provided on the construction device 200 is engaged with the top portion 7, The rotational force from the construction apparatus 200 is transmitted to the shaft portion 101.

  As shown in FIG. 2 and FIG. 4, the interior body 31 is inserted and attached to the inside of the shaft portion 101, and a contact portion 32 that can contact the inner peripheral surface 101 b of the shaft portion 101, and the contact portion 32 as the shaft portion. And a pressing portion 33 that presses against the inner peripheral surface 101b of 101.

  The contact portion 32 has an inner divided piece 35 divided into a plurality (two in this embodiment) in the circumferential direction of the shaft portion 101, and the plurality of inner divided pieces 35 form a tubular member as a whole. ing. Further, the inner divided pieces 35 are attached to the shaft portion 101, the outer surface 35a of the inner divided piece 35 contacts the inner peripheral surface 101b of the shaft portion 101, and the contact portion 32 and the shaft portion 101 are coaxial. Placed in.

  Here, in a state where the outer surface 35a of the inner divided piece 35 is in contact with the inner peripheral surface 101b of the shaft portion 101 and no external force is applied to the inner divided piece 35, the inner divided pieces 35 are separated from each other in the circumferential direction. A gap is formed between the inner divided pieces 35.

  Then, the inner divided piece 35 is inserted inside the shaft portion 101 so that the division position of the contact portion 32 is arranged at a position different from the division position of the exterior body 5. In the present embodiment, this division position is shifted by 90 degrees in the circumferential direction between the exterior body 5 and the contact portion 32.

Each inner divided piece 35 has a crescent shape when viewed from the direction of the axis O, and has a hollow frame structure inside.
More specifically, as shown in FIG. 2, the inner divided piece 35 includes an arcuate plate 40 that is curved along the inner circumferential surface 101 b so as to be in contact with the inner circumferential surface 101 b of the shaft portion 101, and an arcuate plate 40. A first vertical partition plate 41 that protrudes from the center in the circumferential direction toward the inside in the radial direction of the contact portion 32 to a midway position with respect to the axis O and has a flat plate shape extending in the direction of the axis O. ing.

In addition, the inner divided piece 35 includes a pair of second vertical partition plates 42 that form a flat plate projecting from the arc-shaped plate 40 in a direction away from the arc-shaped plate 40 in parallel to the first vertical partition plate 41. Have.
Further, the inner divided piece 35 extends in the direction of the axis O perpendicular to the first vertical partition plate 41 and the second vertical partition plate 42, and is interposed between the pair of second vertical partition plates 42 and the arcuate plate 40. A third vertical partition plate 43 that defines the space S1 and an end plate that forms a flat plate shape that protrudes inward in the radial direction from the circumferential edge of the arc-shaped plate 40 and extends in the direction of the axis O. 46.

  Further, the inner divided pieces 35 connect the corner portions 43a serving as connecting portions between the second vertical partition plates 42 and the third vertical partition plates 43 and the end edges 46a on the radially inner side of the end plate 46, A pair of fourth vertical partition plates 44 defining a space S <b> 2 is provided between the second vertical partition plate 42, the end plate 46, and the arcuate plate 40.

  Further, as shown in FIG. 4, the inner divided piece 35 has a horizontal partition plate 45 provided between the third vertical partition plate 43 and the fourth vertical partition plate 44 and the arcuate plate 40. The horizontal partition plates 45 are provided at a total of four positions between the positions on both ends of the axis O in the inner divided piece 35 and the space between them, in the direction of the axis O.

  In the state where the contact portion 32 is attached to the shaft portion 101, the third vertical partition plate 43 and the fourth vertical partition plate 44 in one inner divided piece 35 and the third vertical partition plate in the other inner divided piece 35. A space S <b> 3 is defined between 43 and the fourth vertical partition plate 44.

The pressing portion 33 is arranged in a space S3 defined between the inner divided pieces 35, and from the third vertical partition plate 43 of the one inner divided piece 35 to the third vertical length of the other inner divided piece 35. A bolt 47 extending toward the partition plate 43 is provided. And the bolt head 47a of the volt | bolt 47 is joined to the 3rd vertical partition plate 43 in one inner side division piece 35 by welding etc. FIG.
The pressing portion 33 has a nut 48 that is screwed to the bolt 47 and provided in contact with the third vertical partition plate 43 in the other inner divided piece 35.

  A pair of the pressing portions 33 having the bolts 47 and the nuts 48 are separated from each other in the direction of the axis O. The pair of pressing portions 33 are provided at positions corresponding to the positions in the direction of the axis O where the horizontal partition plate 45 is provided in the present embodiment.

  The pressing portion 33 can change the separation distance between the nut 48 and the bolt head 47 a by rotating the nut 48 relative to the bolt 47, and the radially outer side with respect to the pair of inner divided pieces 35. It is possible to apply a pressing force F <b> 2 that presses in directions away from each other.

  The direction in which the pressing force F2 applied by the pressing portion 33 and the fastening force F1 by the fastening portion 6 that fastens the exterior body 5 act is different. In this embodiment, these forces are orthogonal to each other. It comes to act on.

  According to such a pile construction jig 1, a force acts so that the outer divided piece 10 is directed radially inward by fastening the exterior body 5 having the outer divided piece 10 divided into a plurality by the fastening portion 6. The outer divided piece 10 is pressed against the shaft portion 101. Accordingly, the exterior body 5 can be brought into close contact with the outer peripheral surface 101 a of the shaft portion 101, and a frictional force can be generated between the shaft portion 101 and the exterior body 5.

  When a rotational force around the axis O is applied from the protrusion 201 of the construction device 200 to the top portion 7, the friction between the shaft portion 101 and the exterior body 5 causes the friction between the shaft portion 101 and the construction device 200. Therefore, the rotational force from the construction apparatus 200 can be transmitted to the shaft portion 101.

  Moreover, since the exterior body 5 is comprised by the divided | segmented outer side division | segmentation piece 10, each outer division | segmentation piece 10 is each compared with the exterior body 5 whole in the case where the exterior body 5 is united. The outer divided piece 10 is small and light, and easy to carry and attach to the shaft 101.

  Furthermore, since the exterior body 5 employs a simple divided structure, the structure is simple and the manufacturing cost can be suppressed.

  Furthermore, by providing the interior body 31, it is possible to press the shaft portion 101 from the inside, and by pressing the shaft portion 101 toward the exterior body 5, the adhesion between the shaft portion 101 and the exterior body 5 can be improved. It can be further improved. Therefore, a larger frictional force can be generated between the shaft portion 101 and the exterior body 5, and the rotational force from the construction apparatus 200 can be transmitted more effectively. As a result, the rotary pile 100 can be rotated and penetrated more efficiently.

If the direction of the pressing force F2 of the interior body 31 and the direction of the tightening force F2 of the exterior body 5 coincide with each other, the force is concentrated only on the coincident portion. There is a possibility that sufficient adhesion between 101 and the exterior body 5 cannot be obtained.
However, in this embodiment, since the direction of the pressing force F2 and the direction of the tightening force F1 are different, the pressing force F2 and the tightening force F1 can be effectively applied, and the shaft portion 101 can be effectively operated. Can be brought into close contact with each other to generate a frictional force.

  Furthermore, by providing the contact portion 32 as the interior body 31, it is possible to apply the pressing force F2 over a wider range in the circumferential direction of the inner peripheral surface 101b of the shaft portion 101 (for example, the entire region in the circumferential direction).

  Moreover, since the contact part 32 of the interior body 31 is comprised by the divided | segmented inner division | segmentation piece 35, each inner division | segmentation piece 35 is compared with the contact part 32 whole in case the interior body 31 is united. Each of the inner divided pieces 35 is small and light, and can be easily transported and attached to the shaft portion 101. Furthermore, by adopting a simple divided structure as the contact portion 32 of the interior body 31, the structure is simple and the manufacturing cost can be suppressed.

  Further, since the outer plate 5 is provided with the second plate 14 as a rib plate, the first plate 13 can be prevented from being deformed when the first plates 13 are fastened together by the fastening portion 6. A frictional force can be effectively generated between the exterior body 5 and the shaft portion 101.

  According to the pile construction jig 1 of the present embodiment, by providing the exterior body 5 and using the frictional force generated between the exterior body 5 and the shaft portion 101, the rotary pile 100 can be easily formed with a simple structure. It can be attached and the rotary pile 100 can be rotated and penetrated.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the structure shown by the above-mentioned embodiment, It can change in the range which does not deviate from the meaning of this invention.
For example, the interior body 31 is not an essential configuration, and only the exterior body 5 may be provided.
Furthermore, the contact part 32 of the interior body 31 and the exterior body 5 may be divided into two or more.

  Moreover, the piece part 7 of the exterior body 5 may be provided in each outer division piece 10, and the installation position is not limited to the above-mentioned case, and corresponds to the protrusion part 201 of the construction apparatus 200. As long as it is provided.

  The fastening portion 6 may be a clamp that sandwiches the first plates 13 instead of the bolts 15 and the nuts 16.

  Further, the shape, structure, and the like of the contact portion 32 of the interior body 31 are not limited to the above-described frame structure, and may be a solid block shape.

  The pressing portion 33 of the interior body 31 may be an actuator or the like instead of the one having the bolt 47 and the nut 48.

  Further, the contact portion 32 may not be provided as the interior body 31 and only the pressing portion 33 may be used.

DESCRIPTION OF SYMBOLS 1 ... Pile construction jig 5 ... Exterior body 6 ... Fastening part 7 ... Top part 10 ... Outer part piece 10a ... Inner surface 10b ... Outer surface 12 ... Fastening plate part 13 ... First plate 13a ... Through hole 14 ... Second plate 15 ... Bolt 16 ... nut 21 ... end face 22 ... end faces 22a and 22b ... face 31 ... interior body 32 ... contact part 33 ... pressing part 35 ... inner divided piece 35a ... outer face 40 ... arc-shaped plate 41 ... first vertical partition plate 42 ... first Two vertical partition plates 43 ... third vertical partition plate 43a ... corner 44 ... fourth vertical partition plate 45 ... horizontal partition plate 46 ... end plate 46a ... end edge 47 ... bolt 47a ... bolt head 48 ... nut 100 ... rotating pile DESCRIPTION OF SYMBOLS 101 ... Shaft part 101a ... Outer peripheral surface 101b ... Inner peripheral surface 102 ... Blade | wing part 200 ... Construction apparatus 201 ... Projection part O ... Axis G ... Ground C ... Corner part S1 ... Space S2 ... Space S3 ... Space F1 ... Fastening force F2 ... Pressing force

Claims (5)

A pile construction jig for rotating and penetrating a rotary pile having a tubular shaft part into the ground,
An exterior body that has an outer divided piece divided into a plurality of portions in the circumferential direction of the shaft portion to form a tubular member as a whole, covers the shaft portion from the outside, and can contact the shaft portion;
A fastening portion for applying a tightening force to fasten the outer divided pieces in a direction close to each other;
From the construction device that is provided integrally with the outer divided piece on the outer surface of the outer divided piece, projects toward the radially outer side of the shaft portion at a part in the circumferential direction of the shaft portion, and rotates the rotary pile. The top part that receives the rotational force,
An interior body that is inserted inside the shaft portion so as to be located inside the exterior body and applies a pressing force to the shaft portion from the inside toward the radially outer side of the shaft portion;
A pile construction jig characterized by comprising: The pile construction jig according to claim 1 , wherein the inner body is capable of adjusting the pressing force. The interior body applies the pressing force so that the pressing force acts in a direction different from the radial direction of the tightening force applied by the fastening portion. Item 3. A pile construction jig according to item 1 or 2 . The inner body has an inner divided piece divided into a plurality in the circumferential direction of the shaft portion to form a tubular member as a whole and a contact portion that can contact the inner peripheral surface of the shaft portion;
A pressing portion for applying a pressing force for pressing the inner divided pieces in a direction away from each other toward the radially outer side;
Pile construction jig according to any one of claims 1 to 3, characterized in that it comprises a. A method for rotating a rotary pile into the ground using the pile construction jig according to any one of claims 1 to 4 ,
A rotating pile construction method comprising applying a rotational force from the construction device to the top part in a state where the exterior body is fastened by the fastening part while pressing the shaft part from the inside by the interior body .

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