JP7610113B2 - Pliers rotation mechanism, pile holding jig equipped with said pliers rotation mechanism, and pliers recovery method - Google Patents

Description

The present invention relates to a pliers rotation mechanism, a pile holding jig equipped with the pliers rotation mechanism, and a pliers recovery method.

For example, Patent Document 1 discloses a pliers rotation mechanism and a pliers retrieval method. This pliers rotation mechanism is connected to the upper end of the pliers rod, and is structured to drive the motor and rotate the pliers rod while receiving the reaction force acting on the motor housing from heavy machinery or the like.

JP 2017-31589 A

In Patent Document 1, when the engagement of the pliers with the pile head is released, the pliers are connected to the pliers rotation mechanism. When the pliers are to be separated from the pile head and retrieved, the connection between the pliers and the pliers rotation mechanism must be released in advance. The pliers rotation mechanism and the pliers are then lifted in turn by heavy machinery and transported to another work site.

For this reason, in the example of Patent Document 1, the work of retrieving the pliers must be performed in two stages, and a pliers rotation mechanism, pile holding jig, and pliers retrieval method that allows the pliers to be easily retrieved after the pile has been driven into the pile hole are desired.

The present invention aims to provide a pliers rotation mechanism that can easily retrieve pliers after driving a pile into a pile hole, a pile holding jig equipped with the pliers rotation mechanism, and a pliers retrieval method.

A pliers rotation mechanism according to one embodiment has a first pressing part provided on a cylindrical holding jig that holds the outer circumferential surface of a columnar rod of the pliers and is supported on a base that spans the pliers hole when a pliers is placed in the pliers hole, and a second pressing part provided on the base. The first pressing part and the second pressing part can be positioned in a position where they can be clamped by a first hydraulic jack. When the holding jig is supported on the base, the first pressing part can be moved horizontally relative to the second pressing part by being clamped and pressed by the first hydraulic jack.
The first pressing part moves horizontally against the second pressing part by being clamped and pressed by the first hydraulic jack, thereby rotating the holding jig that holds the rod of the pliers with respect to the pile and the base, and disengaging the head of the pile from the rotating cap of the pliers. When disengaging the head of the pile from the rotating cap of the pliers, there is no need to remove the motor or the like, and the pliers can be used as is for another pile driving or pile holding. Therefore, the pliers rotation mechanism makes it easy to retrieve the pliers after driving the pile into the pile hole. In addition, since the holding jig that holds the outer circumferential surface of the rod of the pliers and the base are only provided with pressing parts, the first pressing part and the second pressing part are prevented from getting in the way when driving the pile using the pliers.

It is preferable that the first pressing portion of the pliers rotation mechanism is erected relative to the holding jig, and the second pressing portion is erected relative to the base.
When the first and second pressing parts are provided, the pile driver can easily grasp the positional relationship between the first and second pressing parts when placing the base across the pile hole. Therefore, when the pile driver retrieves the pliers after driving the pile, the pile driver can easily place the holding jig and the base in a positional relationship that makes it easy to clamp the first and second pressing parts with the hydraulic jack.

It is preferable that the pliers rotation mechanism has a third pressing part provided on the holding jig at a position symmetrical or approximately symmetrical to the first pressing part with respect to the central axis of the holding jig, and a fourth pressing part provided on the base. The distance between the second pressing part and the fourth pressing part is greater than the outer diameter of the holding jig, and the third pressing part and the fourth pressing part can be arranged at a position where they can be clamped by the first hydraulic jack and a second hydraulic jack different from the first hydraulic jack. With the holding jig supported on the base, the second pressing part can be moved horizontally relative to the fourth pressing part by being clamped and pressed by the second hydraulic jack.
The holding jig can be easily arranged in the same position relative to the base. Therefore, just before the holding jig is supported by the base that spans the post holes, the base can be rotated to easily adjust the distance between the pressing parts.

A pile holding jig in one embodiment has a base, the holding jig, and a pliers rotation mechanism provided on the base and the holding jig.
The pliers rotation mechanism can be formed using items available at the construction site, making it easy to retrieve the pliers.

The holding jig of the pile holding jig has a first half pipe, a first holding piece having a first flange portion provided on the outside of the first half pipe and placed on the base, and a second half pipe, a second holding piece having a second flange portion provided on the outside of the second half pipe and placed on the base. The first holding piece and the second holding piece cooperate to hold the outer circumferential surface of the rod in an annular shape, and the first flange portion and the second flange portion of the holding jig can be placed on the base. It is preferable that at least one of the contact positions between the base and the first flange portion and the second flange portion is subjected to an anti-friction treatment to suppress friction between them.
The anti-friction treatment makes it easy to release the rotation cap from the pile head while the base and the holding jig are in contact with each other. This prevents as much as possible the application of a load, for example in a counterclockwise direction as viewed from above, to the pile head of a pile that is not completely fixed in the pile hole.

The pile holding jig has a first fitting portion provided on at least one of the inner surface of the first half pipe and the inner surface of the second half pipe, and a second fitting portion provided on the rod and fitting with the first fitting portion, and it is preferable that the first fitting portion and the second fitting portion restrict the holding jig from rotating relatively to the rod around the axis of the rod.
Even if the holding force of the holding jig against the outer circumferential surface of the rod is not particularly large, the rod can be rotated reliably when the holding jig is rotated.

The pile holding jig has a first fitting portion provided on at least one of the inner surface of the first half pipe and the inner surface of the second half pipe, and a second fitting portion provided on the rod and fitting with the first fitting portion, and it is preferable that the first fitting portion and the second fitting portion restrict the holding jig from moving relative to the rod in the axial direction of the rod.
Even if the holding force of the holding jig against the outer circumferential surface of the rod is not particularly large, the holding jig can prevent the rod from unintentionally moving along the axial direction of the rod.

It is preferable that the pile holding jig has the first hydraulic jack that clamps the first pressing portion against the second pressing portion.
The hydraulic jack used for the construction of pairing joints can be used as is, eliminating the need for additional costs such as preparing a new hydraulic jack.

A pliers rotation mechanism according to one embodiment includes a holding jig side meshing portion provided on the outer circumferential surface of a holding jig fixed to the outer circumferential surface of a columnar rod of the pliers, a rail, and a slider. The rail includes a rail body fixed to a base spanning a post hole, and a first pressing portion fixed to the rail body. The slider includes a slider body movable along the rail body, a slider side meshing portion fixed to the slider body and engaged with the holding jig side meshing portion, and a second pressing portion provided on the slider body. The second pressing portion and the first pressing portion are provided at positions that can be clamped by a hydraulic jack. When the holding jig is supported on the base and the hydraulic jack clamps the second pressing portion and the first pressing portion relative to each other, the second pressing portion moves horizontally relative to the first pressing portion, and the holding jig and the rod rotate relative to the base.
The first pressing part moves horizontally against the second pressing part by being pressed by the hydraulic jack, and rotates the holding jig relative to the base in conjunction with the slider having the first pressing part. Therefore, the engagement between the pile head of the pile and the rotating cap of the pliers can be released. When releasing the engagement between the pile head of the pile and the rotating cap of the pliers, there is no need to remove the motor or the like, and the pliers can be used for another pile driving or pile holding. Therefore, the pliers rotation mechanism can easily retrieve the pliers after driving the pile into the pile hole. In addition, the pliers rotation mechanism only requires the preparation of the rail, the slider, and the holding jig side meshing part, as well as the provision of a pressing part on the holding jig that holds the outer circumferential surface of the rod of the pliers and on the base. Therefore, when driving a pile using the pliers, the first pressing part and the second pressing part are prevented from interfering with the pile driving operation.

It is preferable that the slider body of the pliers rotation mechanism can be engaged and disengaged from the rail body by moving in an upward and downward direction intersecting the extension direction of the rail body, and that the slider side interlocking portion can be engaged and disengaged from the holding jig side interlocking portion by moving in the upward and downward direction.
For example, even if the amount of rotation of the holding jig relative to the base is insufficient, the slider can be temporarily detached from the rail, then reattached, and the holding jig can be rotated relative to the base using a hydraulic jack.

It is preferable that the slider body of the pliers rotation mechanism be capable of being engaged and disengaged at multiple points along the extension direction of the rail body.
Even if the slider of the pliers rotation mechanism is once removed from the rail, the mounting position can be clearly identified.

The pile holding jig has the base, the holding jig, and a pliers rotation mechanism provided on the base and the holding jig.
By preparing the rails, slider, and holding jig having an interlocking portion of the pliers rotation mechanism, the pliers rotation mechanism can be formed using materials available at the construction site, and the pliers can be easily retrieved.

The method for retrieving pliers involves supporting a holding jig on a base, the holding jig holding the outer surface of the columnar rod of the pliers, which has its head engaged with the rotating cap of the pliers and supports the rotating cap at its lower end, and moving the base horizontally to position a second pressing portion fixed to the base against a first pressing portion provided on the holding jig so that the base can be clamped with a hydraulic jack, clamping the first pressing portion and the second pressing portion with the hydraulic jack, and moving the first pressing portion relative to the second pressing portion while the base is stationary, and rotating the holding jig and the rod relative to the pile and the base.
By this method, the rotation cap of the pliers is disengaged from the head of the pile. The rotation cap of the pliers is then pulled out above the pile hole through the upper end of the pile hole, allowing the pliers to be retrieved. Therefore, by using this pliers retrieval method, the pliers can be easily retrieved after the pile has been driven into the pile hole.

The pliers retrieval method involves supporting a holding jig on a base, which holds the outer surface of the columnar rod of the pliers, whose head is engaged with the rotating cap of the pliers and supports the rotating cap at its lower end, by moving the base horizontally to a position where it can be clamped with a hydraulic jack, a second pressing part that is fixed in an immovable state relative to the base and engages with the holding jig and can move relative to the base, and a first pressing part that engages with the holding jig and can move relative to the base, and clamping the first pressing part and the second pressing part with the hydraulic jack, and moving the first pressing part relative to the second pressing part while the base is stationary, and rotating the holding jig and the rod relative to the pile and the base.
By this method, the rotation cap of the pliers is disengaged from the head of the pile. The rotation cap of the pliers is then pulled out above the pile hole through the upper end of the pile hole, allowing the pliers to be retrieved. Therefore, by using this pliers retrieval method, the pliers can be easily retrieved after the pile has been driven into the pile hole.

This invention provides a pliers rotation mechanism, a pile holding jig, and a pliers retrieval method that can easily retrieve pliers after driving a pile into a pile hole.

This is a schematic diagram showing the pile holding jig of the first embodiment, in which a pile placed in a pile hole is supported by pliers, while the holding jig that holds the pliers' rod is placed on a base that spans the pile hole. FIG. 2 is a schematic diagram showing the pile holding jig as viewed from the direction indicated by the arrow III in FIG. 1 . 4 is a schematic diagram showing the state in which the pile holding jig shown in Figure 3 is operated to release the pliers from the pile head of the pile and place the pliers in a recovery position. This is a schematic diagram showing the pile holding jig of the second embodiment, in which a pile placed in a pile hole is supported by pliers, while the holding jig that holds the pliers' rod is placed on a base that spans the pile hole. 6 is a schematic diagram showing the rod as viewed from the position indicated by the symbol VI in FIG. 5 . 6 is a schematic diagram showing the pile holding jig as viewed from the direction indicated by the symbol VII in FIG. 5 . This is a schematic diagram showing a pile holding jig of the third embodiment, in which a pile placed in a pile hole is supported by pliers, while the holding jig that holds the pliers' rod is placed on a base that spans the pile hole. 9 is a schematic diagram showing the pile holding jig as viewed from the direction indicated by the symbol IX in FIG. 8 . FIG. 9 is an enlarged view of the position indicated by the symbol X in FIG. 8 .

Below, we will explain the form for implementing this invention with reference to the drawings.

First Embodiment
A pile holding jig 10 including a pliers rotation mechanism 12 according to a first embodiment will be described with reference to Figs. 1 to 4 .

The pliers 100 are used to hold the pile 4 in place after it has been buried in the pile hole 1.

The pliers 100 have a rotating cap 102 that engages with the pile head 6 of the pile 4, and a columnar rod 104 that fixes the rotating cap 102 to the lower end. It is preferable that the central axis of the rotating cap 102 and the central axis (longitudinal axis) of the rod 104 coincide with each other. The external appearance of the rotating cap 102 is approximately cylindrical. At the lower end of the rotating cap 102, an engagement recess 102a that is, for example, approximately L-shaped groove-shaped is formed. The cross section perpendicular to the central axis of the rod 104 is formed, for example, in a circular shape. The upper end of the rod 104 is a connection part 106 that is detachably connected to a pile driver.

The pile 4 is formed, for example, in a cylindrical shape. A rotating fitting 8 that engages with the engaging recess 102a of the rotating cap 102 is fixed to the outer circumferential surface of the pile head 6 of the pile 4 in a state where it protrudes from the outer circumferential surface of the pile head 6. Multiple rotating fittings 8 are provided and fixed at predetermined intervals.

The pliers 100 engage with the head 6 of the pile 4 by rotating clockwise when viewed from above around the central axis of the pliers 100, and disengage by rotating in the opposite direction (counterclockwise).

When the pile 4 is set down by self-sinking or by rotating into the pile hole 1 filled with the root fixing liquid 2a and the pile circumference fixing liquid 2b, the rotating fitting 8 of the pile head 6 is engaged with the engagement recess 102a of the rotating cap 102. When the pile 4 is buried in the pile hole 1 and held at a specified depth, the rotating fitting 8 of the pile head 6 of the pile 4 remains engaged with the engagement recess 102a of the rotating cap 102 of the pliers 100.

The pile holding jig 10 has a pliers rotation mechanism 12, a base (pin) 14 that is placed on the ground so as to straddle the pile hole 1, a holding jig 16 that is fixed to the outer periphery of the rod 104 of the pliers 100 and placed on the base 14, and hydraulic jacks 18, 20.

The base 14 is formed in a generally U-shape and has a base 22, a first support portion 24 extending from the base 22 in a generally parallel manner, and a second support portion 26 extending from the base 22 in the same direction as the first support portion 24.

The upper and lower surfaces of the first support portion 24 and the second support portion 26 are formed as planes parallel to each other. The distance between the first support portion 24 and the second support portion 26 is longer than the outer diameter of the rod 104 of the pliers 100 and shorter than the outer diameter of the rotating cap 102 of the pliers 100.

A first protrusion (second pressing portion) 32 is fixed to the upper surface of the first support portion 24. The first protrusion 32 is fixed to the first support portion 24, for example, by welding or bolting. The first protrusion 32 is provided on the upper surface of the first support portion 24 at a position close to the second support portion 26. The first protrusion 32 is formed in a plate shape that stands upright, for example, upward from the upper surface of the first support portion 24. The normal direction of the pressing surface of the first protrusion 32, which is pressed by the fixing portion 18a of the first hydraulic jack 18 described later, is along the direction in which the first support portion 24 extends relative to the base portion 22.

A second protrusion (fourth pressing portion) 34 is fixed to the upper surface of the second support portion 26. The second protrusion 34 is fixed to the second support portion 26, for example, by welding or bolting. The second protrusion 34 is provided on the upper surface of the second support portion 26 at a position close to the first support portion 24. The second protrusion 34 is formed in a plate shape that stands upward from the upper surface of the second support portion 26. The normal direction of the pressing surface of the second protrusion 34, which is pressed by the fixing portion 20a of the second hydraulic jack 20 described later, is along the direction in which the second support portion 26 extends relative to the base portion 22.

The first protrusion 32 is located farther from the base 22 than the second protrusion 34. The distance between the first protrusion 32 and the second protrusion 34 is longer than the outer diameter of flange portions 54, 64 of the holding jig 16, which will be described later.

The base 14 shown in FIG. 2 has a movement prevention plate 28 that prevents the base 14 from moving. The movement prevention plate 28 is provided on the base 22 and extends in the opposite direction to the direction in which the first support part 24 and the second support part 26 extend from the base 22. When heavy machinery H, such as a backhoe, is placed on the movement prevention plate 28, unintentional movement of the base 14 is prevented.

The holding jig 16 has a first holding piece 42 and a second holding piece 44, which cooperate to hold the outer circumferential surface of the rod 104 in an annular shape.

The first holding piece 42 has a first flange portion 54 that is provided on the outside of the first half pipe 52 and placed on the first support portion 24 or the second support portion 26. The normal line of the first flange portion 54 is a direction along the central axis of the holding jig 16 when the first holding piece 42 and the second holding piece 44 cooperate to form a ring. A pair of tabs 56 that are bolted to the second holding piece 44 are formed on the outer circumferential surface of the first half pipe 52. The first holding piece 42 is fixed to the first flange portion 54 and has a first protrusion (first pressing portion) 58 that protrudes from the first flange portion 54. The first protrusion 58 is provided near one of the tabs 56. The first protrusion 58 is formed in the shape of a plate that stands upward from the upper surface of the first flange portion 54. The first protrusion 58 protrudes radially outward beyond the outer edge of the first flange portion 54.

The second holding piece 44 has a second flange portion 64 that is provided on the outside of the second half pipe 62 and placed on the first support portion 24 or the second support portion 26. The normal line of the second flange portion 64 is a direction along the central axis of the holding jig 16 when the first holding piece 42 and the second holding piece 44 cooperate to form a ring. A pair of tabs 66 that are bolted to the first holding piece 42 are formed on the outer circumferential surface of the second half pipe 62. The second holding piece 44 is fixed to the second flange portion 64 and has a second protrusion (third pressing portion) 68 that protrudes from the second flange portion 64. The second protrusion 68 is provided near one of the tabs 66. The second protrusion 68 is formed in the shape of a plate that stands upward from the upper surface of the second flange portion 64. The second protrusion 68 protrudes radially outward beyond the outer edge of the second flange portion 64.

The first protrusion 32 of the first support 24 and the first convex portion 58 of the first retaining piece 42 are formed so as to be pressable within the stroke range of the movable portion 18b of the first hydraulic jack 18 relative to the fixed portion 18a (described later). The second protrusion 34 of the second support 26 and the second convex portion 68 of the second retaining piece 44 are formed so as to be pressable within the stroke range of the movable portion 20b of the second hydraulic jack 20 relative to the fixed portion 20a (described later).

This section describes the pile driving operation of the pile 4 and the operation of retrieving the pliers 100 after the pile driving (method of retrieving the pliers).

First, we will explain how to insert the pile 4 into the pile hole 1.

The first and second holding pieces 42 and 44 of the holding jig 16 hold the outer circumferential surface of the rod 104 of the pliers 100 on the inner circumferential surface of the half pipes 52 and 62 with the tabs 56 and 66 fixed by bolts or the like. At this time, the first and second holding pieces 42 and 44 are attached to the rod 104 so that the flanges 54 and 64 of the first and second holding pieces 42 and 44 are on the rotating cap 102 side of the pliers 100. The flanges 54 and 64 cooperate to form a disk shape. The outer edge of the flanges 54 and 64 radially outward from the central axis of the holding jig 16 defines the outer diameter of the holding jig 16. The position of the holding jig 16 relative to the rod 104 is adjusted assuming a position where the head 6 of the pile 4 is held at a predetermined height position when the holding jig 16 is placed on the base 14 when the pile 4 is erected in the pile hole 1.

The pile hole 1 is filled with the root fixing liquid 2a and the pile circumference fixing liquid 2b. The connection part 106 of the pliers 100 is connected to the pile driver, and the pile 4 is set into the pile hole 1 by self-sinking or rotation with the rotating fitting 8 of the pile head 6 of the pile 4 engaged with the rotating cap 102 of the pliers 100 to which the holding jig 16 is fixed.

After the upper end of the rotating cap 102 is positioned below the upper end of the stake hole 1, the base 14 that has been waiting to the side of the stake hole 1 is positioned so that it straddles the stake hole 1. At this time, the rod 104 is placed between the first support part 24 and the second support part 26.

Flange portions 54, 64 of the holding jig 16 are placed between the first protrusion 32 and the second protrusion 34 of the base 14. The flange portions 54, 64 of the holding jig 16 are placed on the upper surfaces of the first support portion 24 and the second support portion 26. At this time, the first protrusion 32 of the base 14 and the first convex portion 58 of the holding jig 16 are opposed to each other in the extension direction of the first support portion 24. The second protrusion 34 of the base 14 and the second convex portion 68 of the holding jig 16 are opposed to each other in the extension direction of the second support portion 26. Furthermore, both the first protrusion (second pressing portion) 32 and the first convex portion (first pressing portion) 58 are positioned so that they can be clamped by the first hydraulic jack 18, and both the second protrusion (fourth pressing portion) 34 and the second convex portion (third pressing portion) 68 are positioned so that they can be clamped by the second hydraulic jack 20.

At this time, as shown in FIG. 1, the pile bottom 9 of the pile 4 is above the bottom surface 1a of the pile hole 1. The pile circumference fixing liquid 2b is filled above the root fixing liquid 2a. The pile 4 is held in this state relative to the pile hole 1.

Then, the pile driver is disconnected from the connection part 106 at the upper end of the rod 104, and the pile 4 is held by the holding jig 16 until the pile 4 is fixed in the pile hole 1, i.e., until the pile 4 does not sink, for example, for about one to two hours.

Next, we will explain how to retrieve the pliers 100.

After the pile 4 is erected, heavy equipment H, such as a backhoe, is placed on the movement prevention plate 28 protruding from the base 22 of the base 14 to prevent the base 14 from moving relative to the pile hole 1. The heavy equipment H is a backhoe, crane, pile driver, etc. that can be moved when removing the base 14 or the pliers 100 from the pile hole 1.

The first hydraulic jack 18 has a fixed part 18a and a movable part 18b that can move toward and away from the fixed part 18a. The second hydraulic jack 20 has a fixed part 20a and a movable part 20b that can move toward and away from the fixed part 20a.

The first hydraulic jack 18 is positioned so as to sandwich the first protrusion 32 of the base 14 and the first convex portion 58 of the holding jig 16. The second hydraulic jack 20 is positioned so as to sandwich the second protrusion 34 of the base 14 and the second convex portion 68 of the holding jig 16. The second hydraulic jack 20 has the same configuration as the first hydraulic jack 18 and has the same performance. The first hydraulic jack 18 and the second hydraulic jack 20 may be, for example, hydraulic jacks used in the pairing joint construction method for connecting piles together.

In this state, the movable part 18b of the first hydraulic jack 18 is driven to shorten the distance between the first protrusion 32 of the base 14 and the first convex part 58 of the holding jig 16, and the movable part 20b of the second hydraulic jack 20 is driven to shorten the distance between the second protrusion 34 of the base 14 and the second convex part 68 of the holding jig 16. Therefore, with the holding jig 16 supported on the base 14, the first convex part (first pressing part) 58 of the holding jig 16 rotates horizontally with the pile core as the central axis relative to the first protrusion (second pressing part) 32 of the base 14 by the pressure caused by the first hydraulic jack 18 clamping it. In addition, the second protrusion (third pressing portion) 68 of the holding jig 16 rotates horizontally with the pile core as the central axis relative to the second protrusion (fourth pressing portion) 34 of the base 14 by being pinched and pressed by the second hydraulic jack 20. As the holding jig 16 rotates, the rod 104 and the rotating cap 102 rotate counterclockwise (from left to right on the paper surface of FIG. 1) relative to the rotating fitting 8 in FIG. 1 when viewed from above the pile hole 1. This causes the engagement recess 102a of the rotating cap 102 of the pliers 100 to be disengaged from the rotating fitting 8 of the pile head 6 of the pile 4. At this time, the movement distance between the first protrusion 32 of the base 14 and the first protrusion 58 of the holding jig 16, and the movement distance between the second protrusion 34 of the base 14 and the second protrusion 68 of the holding jig 16 are, for example, about 10 cm.

Then, heavy machinery (not shown) is connected to the connection portion 106 of the rod 104, and the heavy machinery is used to move the rod 104 of the pliers 100 upward relative to the stake hole 1. When the flange portions 54, 64 of the holding jig 16 are separated from the support portions 24, 26 of the base 14, the base 14 is slid from a position spanning the stake hole 1 to a position away from above the stake hole 1. Next, the rotating cap 102 of the pliers 100 is pulled out of the stake hole 1. This allows the pliers 100 to be retrieved. At this time, the stake 4 is held in a fixed state in the stake hole 1.

As explained above, the pile holding jig 10 according to this embodiment has the following advantages:

In this embodiment, the pliers rotation mechanism 12 has a convex portion 58 of the holding jig 16 fixed to the outer peripheral surface of the columnar rod 104 of the pliers 100, and a protrusion 32 of the base 14. The convex portion 58 is supported by the base 14 that spans the pile hole 1 when the pile 4 is placed in the pile hole 1. When the protrusion 32 of the base 14 is arranged in a position that can be clamped by the hydraulic jack 18 relative to the convex portion 58 of the holding jig 16, and the protrusion 32 is relatively clamped by the hydraulic jack 18, the convex portion 58 moves relative to the protrusion 32, and the holding jig 16 and the rod 104, i.e., the pliers 100, rotate relative to the pile 4 and the base 14. Therefore, the engagement recess 102a of the rotating cap 102 of the pliers 100 can be released from the engagement of the rotating fitting 8 of the pile head 6 of the pile 4. Then, by connecting the connection part 106 of the rod 104 to the heavy equipment and moving the rod 104 upward while moving the base 14 horizontally and retracting it from the pile hole 1, the pliers 100 can be retrieved from the pile hole 1. Therefore, the pliers rotation mechanism 12 can easily retrieve the pliers 100 after driving the pile 4 into the pile hole 1.

At least one of the contact positions between the top surface of the support parts 24, 26 of the base 14 and the bottom surface of the flange parts 54, 64 of the holding jig 16 is treated with anti-friction processing to suppress friction between them, and they have a sliding property against each other. Therefore, the first hydraulic jack 18 and the second hydraulic jack 20 can rotate the holding jig 16 relative to the base 14 while the flange parts 54, 64 of the holding jig 16 are in contact with the support parts 24, 26 of the base 14.

As shown in FIG. 3, the first flange portion 54 and the second flange portion 64 are formed in a disk shape in cooperation with each other. The outer diameters of the first flange portion 54 and the second flange portion 64 are smaller than the distance between the first protrusion 32 and the second protrusion 34 of the base 14. Therefore, the first flange portion 54 and the second flange portion 64 of the holding jig 16 can be placed on the first support portion 24 and the second support portion 26 of the base 14 while avoiding the first protrusion 32 and the second protrusion 34 of the base 14.

The base 14 is arranged so that the first protrusion 32 of the base 14 faces the first convex portion 58 of the holding jig 16, for example, in a direction along the extension direction of the first support portion 24. At this time, the second protrusion 34 faces the second convex portion 68 of the holding jig 16, for example, in a direction along the extension direction of the second support portion 26. Therefore, the holding jig 16 can be rotated counterclockwise relative to the base 14 when viewed from above using the two hydraulic jacks 18, 20.

In the present embodiment, the pliers rotation mechanism 12 has been described as having the first protrusion 32, the second protrusion 34, the first convex portion 58, and the second convex portion 68. The pliers rotation mechanism 12 does not need to have the second protrusion 34 and the second convex portion 68 as long as the first hydraulic jack 18 can press the first protrusion 32 and the first convex portion 58 and rotate the holding jig 16 around its central axis. Alternatively, the pliers rotation mechanism 12 does not need to have the first protrusion 32 and the first convex portion 58 as long as the second hydraulic jack 20 can press the second protrusion 34 and the second convex portion 68 and rotate the holding jig 16 around its central axis.

The hydraulic jacks 18 and 20 used in this embodiment can be the same as those used to construct a pairing joint that connects two piles. Therefore, there is no need to prepare a new jack when retrieving the pliers 100. In this embodiment, the pliers rotation mechanism 12 can be formed simply by fixing the protrusions 32 and 34 to the base 14 and fixing the convex parts 58 and 68 to the holding jig 16. Even if the base 14 to which the protrusions 32 and 34 are fixed and the holding jig 16 to which the convex parts 58 and 68 are fixed are not present at the construction site, the pliers rotation mechanism 12 can be prepared at the construction site by, for example, welding, as long as the plate-shaped members that become the protrusions 32 and 34 and the plate-shaped members that become the convex parts 58 and 68 can be prepared. Therefore, even if the pliers rotation mechanism 12 is newly formed when retrieving the pliers 100, the manufacturing cost can be reduced.

In this embodiment, when the flange portions 54, 64 of the holding jig 16 are placed on the upper surfaces of the first support portion 24 and the second support portion 26, the first protrusion 32 of the base 14 and the first convex portion 58 of the holding jig 16 are opposed to each other in the extension direction of the first support portion 24, and the second protrusion 34 of the base 14 and the second convex portion 68 of the holding jig 16 are opposed to each other in the extension direction of the second support portion 26. After placing the flange portions 54, 64 of the holding jig 16 on the upper surfaces of the first support portion 24 and the second support portion 26, the first convex portion 58 may be fixed by welding or the like to the first flange portion 54 of the holding jig 16 so as to face the first protrusion 32 of the base 14, and the second convex portion 68 may be fixed by welding or the like to the second flange portion 64 of the holding jig 16 so as to face the second protrusion 34 of the base 14. In this case, it becomes easier to align the pile core relative to the base 14 in the direction around the central axis.

Second Embodiment
A pile holding jig 10 including a pliers rotation mechanism 12 according to a second embodiment will be described with reference to Figures 5 to 7. This embodiment is a modification of the first embodiment, and the same members as those described in the first embodiment are designated by the same reference numerals and will not be described in detail.

As shown in Figures 5 to 7, a rod-side fitting portion (second fitting portion) 108 is provided on the outer peripheral surface of the rod 104 of the pliers 100, parallel to the central axis of the rod 104. The fitting portion 108 is formed at a position on the rod 104 where the holding jig 16 is expected to be fixed. The fitting portion 108 protrudes radially outward from the annular outer peripheral surface of the rod 104 of the pliers 100.

As shown in Figures 6 and 7, a holding jig side fitting portion (first fitting portion) 52a is provided on the first half pipe 52 of the first holding piece 42 of the holding jig 16. The surface of the holding jig side fitting portion 52a on the rod 104 side is formed concavely in a direction away from the central axis of the holding jig 16 with respect to the surface of the first half pipe 52 on the rod 104 side.

The holding jig side fitting portion 52a fits into the rod side fitting portion 108, preventing the holding jig 16 from falling downward relative to the rod 104. Therefore, even if the holding force of the holding jig 16 against the outer circumferential surface of the rod 104 is not particularly large, when the holding jig 16 is rotated around the pile core as a central axis, the rod 104, i.e., the pliers 100, can be reliably rotated around the pile core as a central axis.

As shown in Figures 5 and 6, the rod side fitting portion 108 has multiple protrusions 108a and multiple recesses (grooves) 108b. A given protrusion 108a is formed between a pair of recesses 108b along the central axis of the rod 104. In other words, a given recess 108b is formed between a pair of protrusions 108a along the central axis of the rod 104.

As shown in FIG. 6, the fitting portion 52a has a protrusion 52b that can fit into the recess 108b of the rod side fitting portion 108.

The convex portion 52b of the holding jig side fitting portion 52a fits into the concave portion 108b of the rod side fitting portion 108, thereby restricting the holding jig 16 from moving relative to the rod 104 in the axial direction of the central axis of the rod 104. Therefore, even if the holding force of the holding jig 16 against the outer circumferential surface of the rod 104 is not very large, the holding jig 16 can prevent the rod 104 from moving unintentionally along the axial direction of the rod 104. When the holding jig 16 is supported on the base 14, buoyancy is applied to the pile 4 by the pile circumference fixing liquid 2b, but the holding jig 16 bears the weight of the pliers 100 and the weight of the pile 4. Even in this case, the holding jig 16 can be prevented from moving unintentionally in the axial direction of the central axis of the rod 104 relative to the rod 104.

As shown in FIG. 7, it is preferable that the rod-side fitting portion 108 is formed in a pair on the outer circumferential surface of the rod 104. In this case, the second holding piece 44 is formed with a holding jig-side fitting portion 52a. In this case, the weight balance of the rod 104 of the pliers 100 and the holding jig 16 can be easily achieved.

The holding jig side fitting portion (first fitting portion) 52a may be provided on at least one of the inner peripheral surface of the first half pipe 52 and the inner peripheral surface of the second half pipe 62.

Third Embodiment
A pile holding jig 10 including a pliers rotation mechanism 12 according to a third embodiment will be described with reference to Figures 8 to 10. This embodiment is a modification of the first and second embodiments, and the same members as those described in the first and second embodiments are given the same reference numerals and will not be described in detail.

As shown in Figures 8 and 9, the pliers rotation mechanism 12 has a first rotation mechanism 202 and a second rotation mechanism 204. The first rotation mechanism 202 of the holding jig 16 is provided on the upper surface of the first support portion 24 of the base 14. The second rotation mechanism 204 of the holding jig 16 is provided on the upper surface of the second support portion 26 of the base 14.

On the outer edge of the first flange portion 54 of the holding jig 16, multiple teeth (holding jig side interlocking portion) 60 are arranged at a predetermined interval as an interlocking portion. On the outer edge of the second flange portion 64 of the holding jig 16, multiple teeth (holding jig side interlocking portion) 70 are arranged at a predetermined interval as an interlocking portion. The multiple teeth 60, 70 are part of the pliers rotation mechanism 12.

As shown in Figures 8 to 10, the first rotation mechanism 202 has a first rail 212 fixed to the upper surface of the first support portion 24 and a first slider 214 that moves along the first rail 212.

The first rail 212 has a rail body 222 fixed to the upper surface of the first support part 24, and a first protrusion (first pressing part) 224 fixed to the rail body 222. It is preferable that the first protrusion 224 protrudes on the side opposite the second support part 26.

The rail body 222 has a groove 232 in which the first slider 214 can slide while engaging with it, and three annular portions 234, for example, provided in the groove 232.

The first slider 214 is formed to have a length of approximately 2/3 of the total length of the rail body 222. The first slider 214 has a first slider body 242, two engagement parts 244 that engage with the first rail body 222, a plurality of teeth (slider side engagement parts) 246 that are provided on the first slider body 242 and engage with the teeth 60, 70 of the holding jig 16, and a first protrusion (second pressing part) 248. It is preferable that the first protrusion 248 protrudes on the side opposite the second support part 26. The teeth 246 of the first slider 214 are arranged at predetermined intervals along the extension direction of the rail body 222 of the rail 212.

The engagement portion 244 has a shaft portion 252 extending downward from the first slider body 242 and a lower end portion 254 at the lower end of the shaft portion 252. The shaft portion 252 has a smaller diameter than the width of the groove 232 of the rail 212. The lower end portion 254 has a smaller diameter than the annular portion 234 of the rail 212 and a larger diameter than the width of the groove 232 of the rail 212. Therefore, the engagement portion 244 of the slider 214 can be inserted and removed by the shaft portion 252 and the lower end portion 254 through the annular portion 234 of the rail 212. Therefore, the first slider body 242 can be engaged and disengaged with respect to the first rail body 222 by movement in the up-down direction intersecting the extension direction of the first rail body 222. At this time, the teeth (slider side meshing portion) 246 of the first slider 214 can be disengaged from the teeth (holding jig side meshing portion) 60, 70 of the holding jig 16 by moving in the vertical direction. In addition, the first slider body 242 can be disengaged at multiple points along the extension direction of the first rail body 222.

The second rotation mechanism 204 has a second rail 262 fixed to the upper surface of the second support portion 26 and a second slider 264 that moves along the second rail 262. The second rail 262 has the same configuration as the first rail 212. The second slider 264 has the same configuration as the first slider 214.

The position of the second rail 262 proximal to the base 22 of the base 14 is farther away than the position of the first rail 212 proximal to the base 22 of the base 14. The second rail 262 is provided symmetrically or approximately symmetrically with respect to the central axis of the holding jig 16 with respect to the first rail 212. The second slider 264 is provided symmetrically or approximately symmetrically with respect to the central axis of the holding jig 16 with respect to the first slider 214. In other words, the second rotation mechanism 204 is provided symmetrically or approximately symmetrically with respect to the central axis of the holding jig 16 with respect to the first rotation mechanism 202.

The following describes the operation of driving the pile 4 and the operation of retrieving the pliers 100 after driving the pile. The same content as that described in the first embodiment will be omitted where appropriate.

First, we will briefly explain the work of driving the pile 4 into the pile hole 1.

Here, an example will be described in which the first slider 214 is pre-engaged with the first rail 212 in the position shown in FIG. 9, and the second slider 264 is pre-engaged with the second rail 262 in the position shown in FIG. 9.

The holding jig 16 holds the outer surface of the rod 104 of the pliers 100. With the rotating cap 102 of the pliers 100 to which the holding jig 16 is fixed engaged with the rotating fitting 8 of the pile head 6 of the pile 4, the pile 4 is set into the pile hole 1 by self-sinking or rotation.

After the upper end of the rotating cap 102 is positioned below the upper end of the stake hole 1, the base 14 is positioned so as to straddle the stake hole 1. At this time, the rod 104 is positioned between the first support part 24 and the second support part 26.

The flanges 54, 64 of the holding jig 16 are placed between the first rail 212 and the second rail 262 of the base 14. The flanges 54, 64 of the holding jig 16 are placed on the upper surfaces of the first support portion 24 and the second support portion 26. At this time, the central axis of the holding jig 16 is placed between the first protrusion 224 of the first rail 212 and the second protrusion 224 of the second rail 262. Then, the teeth 70 of the holding jig 16 are engaged with the teeth 246 of the first slider 214, and the teeth 60 of the holding jig 16 are engaged with the teeth 246 of the second slider 264.

Disconnect the pile driver from the connection part 106 at the upper end of the rod 104, and after driving the pile, leave it for about one to two hours, for example, until the pile 4 is fixed in the pile hole 1.

Next, we will explain how to retrieve the pliers 100.

After the pile 4 is driven, the weight H is placed adjacent to the base 22 of the base 14.

The first hydraulic jack 18 is positioned so as to sandwich the first protrusion 224 of the first rail 212 and the first convex portion 248 of the first slider 214. The second hydraulic jack 20 is positioned so as to sandwich the second protrusion 224 of the second rail 262 and the second convex portion 248 of the second slider 264.

In this state, the movable part 18b of the first hydraulic jack 18 is driven to reduce the distance between the first protrusion 224 of the first rail 212 and the first convex part 248 of the first slider 214, and the movable part 20b of the second hydraulic jack 20 is driven to reduce the distance between the second protrusion 224 of the second rail 262 and the second convex part 248 of the second slider 264. The first slider 214 moves in a direction away from the base 22 of the base 14, and the second slider 264 moves in a direction approaching the base 22 of the base 14. Since the base 14 is prevented from moving relative to the post hole 1 by the weight H, the teeth 70 of the holding jig 16 mesh with the teeth 246 of the first slider 214, and the teeth 60 of the holding jig 16 mesh with the teeth 246 of the second slider 264. In this state, the holding jig 16 placed on the base 14 rotates counterclockwise as viewed from above relative to the base 14, the first rail 212, the second rail 262, the post 4, and the post hole 1. As the holding jig 16 rotates, the rod 104 and the rotating cap 102 rotate counterclockwise as viewed from above the post hole 1 relative to the rotating fitting 8 in FIG. 1. As a result, the engagement recess 102a of the rotating cap 102 of the pliers 100 and the rotating fitting 8 of the post head 6 of the post 4 are disengaged.

If the rotation angle of the holding jig 16 and the rod 104 of the pliers 100 is insufficient to release the engagement of the engagement recess 102a of the rotating cap 102 with the rotating fitting 8, the first hydraulic jack 18 is removed from the first rail 212 and the first slider 214. The first slider 214, which has moved in a direction away from the base 22 of the base 14 relative to the first rail 212, is pulled upward relative to the first rail 212 and returned to the state shown in FIG. 9. In this state, the first hydraulic jack 18 is again repositioned so that it is sandwiched between the first protrusion 224 of the first rail 212 and the first convex portion 248 of the first slider 214. The same applies to the second rotating mechanism 204.

Therefore, by driving the first hydraulic jack 18 and the second hydraulic jack 20, the rotation angle of the holding jig 16 and the rod 104 of the pliers 100 is rotated to the desired angle.

As explained above, the pile holding jig 10 according to this embodiment has the following advantages:

In this embodiment, the first protrusion 224 of the first rail 212 moves horizontally relative to the first convex portion 248 of the first slider 214 by being pressed by the hydraulic jack 18, thereby rotating the holding jig 16 relative to the base 14 in conjunction with the slider 214 having the first convex portion 248. This allows the engagement between the head 6 of the pile 4 and the rotating cap 102 of the pliers 100 to be released. Therefore, the pliers rotation mechanism 12 can easily retrieve the pliers 100 after driving the pile 4 into the pile hole 1. When releasing the engagement between the head 6 of the pile 4 and the rotating cap 102 of the pliers 100, there is no need to remove the motor, etc., and the pliers 100 can be used as is for another pile driving or pile holding. In addition, the pliers rotation mechanism 12 only requires the rail 212, slider 214, and teeth (engagement portion on the holding jig side) 60, 70, as well as the first protrusion 224 of the first rail 212 and the first convex portion 248 of the first slider 214 on the holding jig 16 that holds the outer circumferential surface of the rod 104 of the pliers 100 and the base 14. This prevents the first protrusion 224 and the first convex portion 248 from interfering with the pile driving operation when driving a pile using the pliers 100.

In this embodiment, the direction in which the first protrusion 224 of the first rail 212 and the first convex portion 248 of the first slider 214 move relative to each other coincides with the direction in which the first support portion 24 of the base 14 extends. Therefore, for example, the contact area between the first protrusion 224 of the first rail 212 and the fixed portion 18a of the first hydraulic jack 18, and the contact area between the first convex portion 248 of the first slider 214 and the movable portion 18b of the first hydraulic jack 18 can be maintained.

Even if the amount of rotation of the holding jig 16 relative to the base 14 is insufficient when retrieving the pliers 100, the first slider 214 can be reattached to the first rail 212, so that the first protrusion 224 of the first rail 212 and the first convex portion 248 of the first slider 214 are again positioned as shown in FIG. 9, making the first hydraulic jack 18 ready for use. Therefore, by driving the first hydraulic jack 18, the holding jig 16 can be rotated a desired angle relative to the base 14.

The rod-side fitting portion 108 of the rod 104 and the holding jig-side fitting portion 52a of the holding jig 16 shown in Figures 8 and 9 have the same configuration as those described in the second embodiment. The holding jig 16 and the rod 104 may have the same configuration as those described in the first embodiment.

The present invention is not limited to the above-described embodiment, and various modifications can be made in the implementation stage without departing from the gist of the invention. The embodiments may be implemented in appropriate combination, in which case the combined effects can be obtained. Furthermore, the above-described embodiment includes various inventions, and various inventions can be extracted by combinations selected from the multiple constituent elements disclosed. For example, if the problem can be solved and an effect can be obtained even if some constituent elements are deleted from all the constituent elements shown in the embodiment, the configuration from which the constituent elements are deleted can be extracted as an invention.

1...pile hole, 2a...root hardening liquid, 2b...pile circumference fixing liquid, 4...pile, 6...pile head, 8...rotating metal fitting, 10...pile holding jig, 12...pliers rotation mechanism, 14...base, 16...holding jig, 18...first hydraulic jack, 18a...fixed part, 18b...movable part, 20...second hydraulic jack, 20a...fixed part, 20b...movable part, 22...base, 24...first support part, 26...second support part, 28...movable Anti-motion plate, 32...first protrusion, 34...second protrusion, 42...first holding piece, 44...second holding piece, 52...first half pipe, 54...first flange, 56...tab, 58...first convex part, 62...second half pipe, 64...second flange, 66...tab, 68...second convex part, 100...pliers, 102...rotating cap, 102a...engagement recess, 104...rod.

Claims (15)

A first pressing portion provided on a cylindrical holding jig that holds a columnar rod of a pliers and is supported on a base that spans the pile hole when a columnar pile is placed in the pile hole;
a second pressing portion provided on the base,
The first pressing portion and the second pressing portion are disposed at positions where they can be clamped by a first hydraulic jack,
A pliers rotation mechanism in which, with the holding jig supported on the base, the first pressing portion can be rotated around the pile core of the pile relative to the second pressing portion by being clamped and pressed by the first hydraulic jack. The first pressing portion is provided upright relative to the holding jig,
The pliers rotation mechanism according to claim 1 , wherein the second pressing portion is erected relative to the base. a third pressing portion provided on the holding jig at a position symmetrical or substantially symmetrical to the first pressing portion with respect to a central axis of the holding jig;
a fourth pressing portion provided on the base,
A distance between the second pressing portion and the fourth pressing portion is greater than an outer diameter of the holding jig,
The third pressing portion and the fourth pressing portion are disposed at positions where they can be sandwiched between the first hydraulic jack and a second hydraulic jack,
The pliers rotation mechanism according to claim 1 or claim 2, wherein, with the holding jig supported on the base, the third pressing portion is capable of rotating around the pile core of the pile relative to the fourth pressing portion by being clamped and pressed by the second hydraulic jack. The base;
The holding jig;
The pliers rotation mechanism according to any one of claims 1 to 3, which is provided on the base and the holding jig;
A pile holding jig having a The holding jig is
a first half pipe; and a first holding piece having a first flange portion provided on an outer side of the first half pipe and placed on the base;
a second half pipe; and a second holding piece having a second flange portion provided on an outer side of the second half pipe and placed on the base;
having
the first holding piece and the second holding piece cooperate to hold the outer circumferential surface of the rod in an annular shape, and the first flange portion and the second flange portion of the holding jig can be placed on the base,
The pile holding jig according to claim 4 , wherein at least one of the contact positions between the base and the first flange portion and the second flange portion is subjected to an anti-friction treatment for suppressing friction therebetween. a first fitting portion provided on at least one of an inner peripheral surface of the first half pipe and an inner peripheral surface of the second half pipe;
a second fitting portion provided on the rod and adapted to fit into the first fitting portion;
The pile holding jig according to claim 5 , wherein the first fitting portion and the second fitting portion restrict the holding jig from rotating relatively to the rod about an axis of the rod. The pile holding jig according to claim 6, wherein the first fitting portion and the second fitting portion restrict the holding jig from moving relative to the rod in the axial direction of the rod. a first fitting portion provided on at least one of an inner peripheral surface of the first half pipe and an inner peripheral surface of the second half pipe;
a second fitting portion provided on the rod and adapted to fit into the first fitting portion;
The pile holding jig according to claim 5 , wherein the first fitting portion and the second fitting portion restrict the holding jig from moving relatively to the rod in an axial direction of the rod. The pile holding jig according to any one of claims 4 to 8, comprising the first hydraulic jack that clamps the first pressing part against the second pressing part. A holding jig side meshing portion provided on an outer peripheral surface of a holding jig fixed to an outer peripheral surface of a columnar rod of the pliers;
A rail having a rail body fixed to a base spanning a post hole and a first pressing portion fixed to the rail body;
a slider including a slider body movable along the rail body, a slider side meshing portion fixed to the slider body and engaged with the holding jig side meshing portion, and a second pressing portion provided on the slider body;
having
The first pressing portion and the second pressing portion are provided at positions where they can be clamped by a hydraulic jack,
A pliers rotation mechanism in which, when the holding jig is supported on the base and the second pressing portion and the first pressing portion are clamped relative to each other with the hydraulic jack, the second pressing portion moves horizontally relative to the first pressing portion, and the holding jig and the rod rotate relative to the base. the slider body is capable of being engaged with and disengaged from the rail body by movement in an up-down direction intersecting an extension direction of the rail body,
The pliers rotation mechanism according to claim 10, wherein the slider side interlocking portion is capable of engaging and disengaging with respect to the holding jig side interlocking portion by movement in the vertical direction. The pliers rotation mechanism according to claim 11, wherein the slider body can be engaged and disengaged at multiple points along the extension direction of the rail body. The base;
The holding jig;
The pliers rotation mechanism according to any one of claims 10 to 12, which is provided on the base and the holding jig;
A pile holding jig having a When a holding jig for holding an outer peripheral surface of a columnar rod of the pliers, which has a head of a pile engaged with a rotating cap of the pliers and supports the rotating cap at its lower end, is supported on a base, a second pressing portion fixed to the base is disposed in a position where the base can be moved horizontally and clamped by a hydraulic jack relative to a first pressing portion provided on the holding jig,
A pliers retrieval method comprising: clamping the first pressing portion and the second pressing portion with the hydraulic jack; moving the first pressing portion relative to the second pressing portion while the base is stationary; and rotating the holding jig and the rod relative to the pile and the base. When a holding jig for holding the outer peripheral surface of the columnar rod of the pliers, which has a pile head engaged with a rotating cap of the pliers and supports the rotating cap at its lower end, is supported on a base, a second pressing part that is fixed in a state not moving relative to the base is disposed in a position where it can be clamped by a hydraulic jack by moving the base horizontally, in comparison with a first pressing part that engages with the holding jig and can move relative to the base,
A pliers retrieval method comprising: clamping the first pressing portion and the second pressing portion with the hydraulic jack; moving the first pressing portion relative to the second pressing portion while the base is stationary; and rotating the holding jig and the rod relative to the pile and the base.