JP7205838B1 - Pile driving device and pile driving method - Google Patents

Abstract

[PROBLEMS] To provide a pile driving device and a pile driving method capable of efficiently forming an excavated hole and driving a pile in a low headroom environment. A pile driving device according to one embodiment holds a rotary press-fitting machine 10 for press-fitting a tubular casing C into the ground while rotating it, and a screw auger S inserted into the casing C. and a screw auger excavator 20 that excavates the ground B by rotating the screw auger S located inside. The rotary press-fitting machine 10 press-fits a plurality of casings C so that the plurality of casings C are lined up along the depth direction of the ground B. As shown in FIG. A plurality of screw augers S are connectable to each other. The screw auger excavator 20 connects another screw auger S on top of the previously placed screw auger S above the casing C that has been press fitted. [Selection drawing] Fig. 7

Description

The present disclosure relates to a pile driving device and a pile driving method used in low clearance construction.

Japanese Patent No. 3876042 describes an auger screw detachable low clearance pile driver. This pile driver includes a base machine having a traveling mechanism, an arm that swings up and down by a hydraulic cylinder, and a trunnion attached to the tip of the arm. A leader body with a sheave attached is suspended from the trunnion, and a hydraulic auger is attached to the leader body so that it can move up and down. The hydraulic auger has a reducer to which a top-up auger screw is attached.

Japanese Patent No. 5869400 describes an excavator that press-fits a casing made of a cylindrical steel pipe into the ground. The excavator comprises a base machine with a boom, and a frame and swivel head suspended from an auxiliary crane attached to the tip of the boom. A casing press-fit device is provided in front of the base machine and below the swivel head. The casing press-fit device has a central space into which the casing is inserted, and press-fits the casing into the ground while pinching and rotating the casing. A rotary drilling device is provided at the bottom of the swivel head. A new casing is spliced by an auxiliary crane to the casing held by the casing press-fitting device.

Japanese Utility Model Registration No. 3173014 describes a low-head excavator. A low headspace excavator includes a device body that travels along rails, an elevating body that ascends and descends with respect to the device body, and a screw and a casing that are suspended by suspending means provided on the elevating body. The screw is a splicable short screw, and the casing is a splicable short casing.

Japanese Patent No. 3876042 Japanese Patent No. 5869400 Utility Model Registration No. 3173014

As previously mentioned, it is known to form boreholes for driving piles using replenishable screws and replenishable casings in low headroom environments. However, if one machine is used to replenish the casing and replenish the screw, it may not be possible to efficiently drive the pile. In particular, when the number of piles to be driven is large, it takes a long time to excavate the excavation holes, so it is required to form the excavation holes efficiently.

An object of the present disclosure is to provide a pile driving device and a pile driving method that are capable of efficiently forming a bore hole and driving a pile under a low headroom environment.

The pile driving device according to the present disclosure holds a rotary press-fitting machine that presses into the ground while rotating a tubular casing, and a screw auger that is inserted inside the casing, and rotates the screw auger located inside the casing. and a screw auger excavator for excavating the ground. A rotary press-fitting machine press-fits a plurality of casings so that the plurality of casings are lined up along the depth direction of the ground. A plurality of screw augers are connectable to each other. The screw auger excavator connects another screw auger on top of the screw auger previously placed above the press-fitted casing, and the rotary presser and the screw auger excavator can run independently of each other. .

In this pile driving apparatus, a rotary press-fitting machine rotates a tubular casing and presses it into the ground, and the screw auger excavator rotates a screw auger located inside the casing to excavate the ground. A plurality of casings are press-fitted by a rotary press-fitting machine so as to be aligned along the depth direction of the ground, and a plurality of screw augers are connected to each other inside the plurality of casings. Above the press-fitted casing, the screw auger excavator connects another screw auger onto the previously placed screw auger. Accordingly, a plurality of casings are press-fitted by the rotary press-fitting machine, and the screw auger is connected above the press-fitted casings. Therefore, even in a low headroom environment, the casing can be press-fitted by the rotary press-fitting machine, and the screw auger can be connected and excavated. In addition, since the connection of the screw auger is performed above the press-fitted casing, the connection of the screw auger can be performed smoothly above the casing, so that the drilling hole can be formed and the pile can be smoothly performed. .

The pile driving device may include a suction pipe (slime) connected to the upper end of the screw auger and sucking mud excavated through the screw auger. In this case, the slime located at the bottom of the excavated hole formed by the screw auger can be sucked by the suction pipe. Therefore, since the mud obtained by excavation can be efficiently sucked, the excavation hole can be formed more efficiently.

The screw auger may have blades, and the rotary press-fitting machine may have a mud remover that is inserted above the blades and removes mud that rises up the screw auger as the screw auger rotates. In this case, since the mud removing member can remove the mud that rises in the screw auger, the mud can be collected efficiently. Further, by providing the mud removal member in the rotary press-fitting machine, the rotary press-fitting machine for press-fitting the casing can also be used for mud removal.

The screw auger excavator may have an auger gripping rotary member that includes an openable and closable gripper that grips the screw auger and a motor that rotates the screw auger. The auger gripping rotating member grips one screw auger by closing the gripping portion to connect the one screw auger to another screw auger located below, and opens the gripping portion to connect the motor to the one screw auger. By doing so, one screw auger and the other screw auger may be rotated. In this case, a plurality of screw augers can be connected to each other by the auger gripping rotating member, and the plurality of screw augers can be rotated by the motor. Therefore, since it is possible to efficiently connect and rotate a plurality of screw augers, drilling holes can be formed more efficiently.

In the pile driving method according to the present disclosure, a screw auger excavator rotates a screw auger inserted into a tubular casing that is press-fitted into the ground by a rotary press-fitting machine to form an excavation hole for driving a pile. It is a pile driving method that The screw auger excavator has an auger gripping rotary member that includes an openable and closable gripper that grips the screw auger and a motor that rotates the screw auger. The pile driving method includes a step of gripping one screw auger by closing the gripping portion, a step of connecting the one screw auger to another screw auger located below, and a step of opening the gripping portion to open the one screw auger. and a step of causing the motor to rotate one screw auger and the other screw auger, and the rotary press-fitting machine and the screw auger excavator can travel independently of each other .

In this pile driving method, a screw auger excavator rotates a screw auger located inside a casing to excavate the ground, and a plurality of screw augers are connected to each other inside a plurality of casings. A screw auger excavator connects one screw auger to another screw auger located below by closing a grip, and connects a motor to one screw auger by opening a grip. Then, the motor rotates the other screw auger together with the one screw auger. Therefore, the plurality of screw augers can be connected to each other, and the plurality of screw augers can be rotated by the motor, so that the connection and rotation of the plurality of screw augers can be efficiently performed. Therefore, it is possible to efficiently form an excavation hole and drive a pile.

Advantageous Effects of Invention According to the present disclosure, drilling and piling can be efficiently performed in a low-airhead environment.

1 is a side view schematically showing a rotary press-fitting machine according to an embodiment; FIG. It is a side view showing typically a screw auger excavator concerning an embodiment. FIG. 4 is a plan view showing an example of a construction site using a rotary press-fitting machine and a screw auger excavator; Each of (a) and (b) is a figure which shows 1 process of the pile driving method which concerns on embodiment. Each of (a) and (b) is a figure which shows 1 process of the pile driving method which concerns on embodiment. 3(a) is a view showing an auger rotary gripping member of the screw auger excavator of FIG. 2; FIG. (b) is a side view showing an example of a screw auger. Each of (a) and (b) is a figure which shows 1 process of the pile driving method which concerns on embodiment. (a) is a figure which shows 1 process of the pile driving method which concerns on embodiment. (b) is a diagram schematically showing a suction pipe for sucking mud (slime) excavated via a screw auger. FIG. 4 is a diagram schematically showing a mud removing member that the rotary press-fitting machine has; 10(a) and 10(b) are diagrams showing the mud remover of FIG. 9. FIG. Each of (a) and (b) is a figure which shows 1 process of the pile driving method which concerns on embodiment. Each of (a) and (b) is a figure which shows 1 process of the pile driving method which concerns on embodiment.

Hereinafter, embodiments of a pile driving device and a pile driving method according to the present disclosure will be described with reference to the drawings. In the description of the drawings, the same reference numerals are given to the same or corresponding elements, and overlapping descriptions are omitted as appropriate. In addition, the drawings are partially simplified or exaggerated for easy understanding, and the shapes, dimensions, angles, and the like are not limited to those described in the drawings.

As shown in FIGS. 1 and 2 , the pile driving device 1 according to this embodiment includes a rotary press-in machine 10 and a screw auger excavator 20 . The pile driving method according to the present embodiment is performed jointly by the rotary press-in machine 10 and the screw auger excavator 20 . First, configurations of the rotary press-fitting machine 10 and the screw auger excavator 20 will be described with reference to FIGS. 1 and 2 . 1 and the screw auger excavator 20 in FIG. 2 are simplified.

The rotary press-fit machine 10 press-fits a casing C (see FIG. 4A and the like), which is a steel pipe, into the ground G, for example. The rotary press-fitting machine 10 is a self-propelled all-around rotary machine. That is, the rotary press-fitting machine 10 is a self-propelled all-around rotary machine dedicated to casings. For example, the rotary press-fitting machine 10 includes a crawler 11 for running the rotary press-fitting machine 10 , a cabin 12 provided above the crawler 11 , and a rotary press-fitting section 13 attached to the cabin 12 . Although there is a machine equipped with a hammer grub as a machine for excavating the inside of the casing C, the hammer grub is not used in this embodiment.

For example, the rotary press-fit portion 13 is supported by the cabin 12 . As an example, the rotary press-fit portion 13 has a leader 13A having a support stay 13b and a support arm 13c, and a press-fit machine body 13B. The press-fitting machine main body 13B has a press-fitting portion 13f that moves up and down together with the elevating body 13d. Although an example of the configuration of the rotary press-fitting machine 10 has been described above, the configuration of the rotary press-fitting machine 10 is not limited to the above example and can be changed as appropriate.

The screw auger excavator 20 is a machine dedicated to drilling while holding the screw auger S (see FIG. 4(b)). The screw auger excavator 20 includes, for example, a crawler 21 for running the screw auger excavator 20, a cabin 22 provided in the upper part of the crawler 21, a cylinder 23 extending obliquely upward from the cabin 22, and an upper end 23b of the cylinder 23. and a leader 24 positioned between the front part 22b of the cabin 22 and the front part 22b. An auger gripping rotating member 25 that grips and rotates the screw auger S is attached to the leader 24 , and the auger gripping rotating member 25 extends and contracts along the leader 24 in the vertical direction. The configuration of the auger gripping rotating member 25 will be described in detail later.

FIG. 3 is a plan view showing an exemplary site A where the pile driving method according to this embodiment is performed. As shown in FIG. 3, site A is a site where a plurality of new piles K are driven into a portion between a pair of elevated highway bridges A1 in plan view, and bridge piers are erected on piles K. be. As an example, eight (2×4) piles K are driven between a pair of elevated highway bridges A1. At the site A, construction is performed to add a girder between the pair of elevated highway bridges A1 to integrate the paired elevated highway bridges A1. In conjunction with this integration work, cast-in-place pile work is carried out at Site A.

For example, site A is a site in a cold region. Therefore, from the viewpoint of anti-freezing, the muddy drilling method cannot be adopted. Moreover, as will be described later in this embodiment, a construction method that can reduce the disposal cost of mud generated by mud excavation is desirable. Site A is a position adjacent to the existing elevated highway bridge A1, and cast-in-place pile work is performed at a position adjacent to the elevated highway bridge A1.

Site A has a drilled ground containing a peat layer, so there is concern about the loss of muddy water. Therefore, from the viewpoint of hole wall protection and muddy water head securing, the all-casing construction method is adopted in this embodiment. In addition, since Site A includes a thick peat layer under the ground surface, it is desirable to adopt a construction method that keeps the ground pressure of the heavy machinery to be kept low from the viewpoint of securing the ground bearing capacity, and the use of large heavy machinery is difficult. is. Therefore, small heavy machines such as the rotary press-in machine 10 and the screw auger excavator 20 are employed in this embodiment.

The work at the site A is performed under the elevated highway bridge A1. Therefore, from the viewpoint of securing the clearance, construction using a large machine that does not require an upper limit cannot be adopted. . "Low clearance" is, for example, 15 m or less, and as an example, the height of the elevated highway bridge A1 is 6 m. Therefore, the pile driving device 1 and the pile driving method according to the present embodiment are performed within a height range of 6 m or less from the ground G.

At the site A, for example, 250 cast-in-place piles will be driven, so from the viewpoint of securing the process, in this embodiment, a construction method having a drilling capacity that can complete the driving in one year is adopted. In addition, the construction yard of site A is under the elevated highway bridge A1, and from the viewpoint of yard restrictions, it is necessary to be able to perform construction in a narrow space such as between a pair of elevated highway bridges A1. In view of the above points, the pile driving device 1 and the pile driving method according to the present embodiment are effective.

In the area between the pair of elevated highway bridges A1, the rotary press-in machine 10 press-fits a plurality of casings C and the screw auger excavator 20 connects and rotates a plurality of screw augers S for driving piles K. Drilling is performed. Since the elevated road bridge A1 is provided above the rotary press-in machine 10 and the screw auger excavator 20, all the work performed by the rotary press-in machine 10 and the screw auger excavator 20 is performed below the elevated road bridge A1. A plurality of casings C are connectable to each other so as to line up along the vertical direction. A plurality of screw augers S are connectable to each other so as to line up along the vertical direction.

At the site A, for example, a plurality of casings C, a plurality of screw augers S, and a crane vehicle 30 are arranged. The crane truck 30 is, for example, a crawler crane. The crane truck 30 delivers the casing C to the rotary press-fitting machine 10 and delivers the screw auger S to the screw auger excavator 20 . Below, the details of the pile driving method and the pile driving apparatus 1 of the present embodiment, including drilling procedures, will be described.

First, as shown in FIG. 4(a), the rotary press-fitting machine 10 drives the casing C into the ground G (step of press-fitting the casing). At this time, the press-fitting portion 13f of the rotary press-fitting machine 10 grips the casing C from the crane truck 30, rotates the gripped casing C, and press-fits it into the ground G. As shown in FIG. As a result, the casing C is set on the ground B of the site A.

Further, as shown in FIG. 4B, the screw auger excavator 20 is arranged in front of the rotary press-fitting machine 10, and the crane vehicle 30 does not interfere with the screw auger excavator 20 and the auger gripping rotating member 25. Pass the screw auger S at the position. At this time, the screw auger S is gripped by the auger gripping rotation member 25 of the screw auger excavator 20 (step of gripping the screw auger by the screw auger excavator). The gripped screw auger S is then pulled in the direction of the screw auger excavator 20 to be arranged above the casing C. As shown in FIG.

Next, as shown in FIGS. 5(a) and 5(b), the crane vehicle 30 delivers another screw auger S to the screw auger excavator 20, and the other screw auger S is lowered. The other screw auger S is connected to the screw auger S described above (step of connecting the screw auger). As a result, a plurality of screw augers S are connected to each other so as to line up along the vertical direction.

Here, the auger gripping rotary member 25 of the screw auger excavator 20 will be described with reference to FIG. 6(a). As shown in FIGS. 2 and 6(a), the auger gripping rotating member 25 is connected to the reader 24 via a cable 26 and a connecting member 27, for example. The auger gripping rotating member 25 has a cable 26, a connecting member 27, a gripping portion 28 that grips the screw auger S, and a motor 29 that is a speed reducer that rotates the screw auger S.

The grip portion 28 has a body portion 28b to which the cable 26 and the connection member 27 are connected, and a pair of arm portions 28c extending downward from the body portion 28b and arranged horizontally. Each of the pair of arm portions 28c is rotatable via a shaft 28d extending in the horizontal direction (perpendicular to the plane of FIG. 6(a)).

The pair of arm portions 28c can be opened and closed by rotating around each shaft 28d. In FIG. 6A, the pair of arm portions 28c indicated by solid lines indicates the state in which the pair of arm portions 28c are closed, and the pair of arm portions 28c indicated by the two-dot chain line indicates the state in which the pair of arm portions 28c are opened. is shown.

The pair of arm portions 28c grip the screw auger S by rotating about the shaft 28d and extending downward, and open the screw auger S by rotating about the shaft 28d and opening in a direction other than downward. Release the grip of S. Each arm portion 28c has a claw portion 28f at its tip. When the pair of arm portions 28c are rotated downward and closed, the pair of claw portions 28f face each other in the horizontal direction.

FIG. 6(b) is a side view showing the screw auger S in an enlarged manner. As shown in FIG. 6(b), the screw auger S has a rod-shaped shaft S1 and blades S2 spirally formed on the shaft S1. A connecting portion S3 for connecting another screw auger S or a motor 29 and a groove portion S4 to be gripped by the gripping portion 28 of the screw auger excavator 20 are formed at one end portion of the shaft portion S1. The screw auger S further has a hole E extending along the shaft S1 inside the shaft S1. The groove S4 is, for example, an annular recess. The gripping portion 28 grips the screw auger S by closing the pair of arm portions 28c and inserting each claw portion 28f into the groove portion S4.

As shown in FIGS. 5(a), 5(b), 6(a) and 6(b), after connecting the plurality of screw augers S, the pair of arm portions 28c are opened to The gripping of the screw auger S by the gripping part 28 is released (step of releasing the gripping of the screw auger). Then, the auger gripping rotating member 25 descends and the motor 29 is connected to the connecting portion S3 at the upper end of the screw auger S (step of connecting the motor).

By driving the motor 29, the plurality of screw augers S are rotated. At this time, the plurality of screw augers S rotate around an axis line L passing through the center of the shaft portion S1 of the screw auger S and extending along the shaft portion S1. As a result, excavation of the ground B by the screw auger S inside the casing C becomes possible. The excavated soil rises together with the blade portion S2 as the screw auger S rotates (the step of discharging soil).

After that, as shown in FIG. 7(a), the press-fitting of the casing C, the connection of the screw auger S, and the excavation of the ground B by the screw auger S are repeated to advance the formation of the excavation hole H. Connection of the screw auger S is performed vertically above the casing C which is press-fitted. After the formation of the borehole H is completed, as shown in FIG. 7(b), the mud R (slime M (see FIG. 8(a))) remaining in the borehole H is sucked and removed.

8(a) and 8(b), the slime M is sucked through a swivel device 40 attached to the upper end of the screw auger S. As shown in FIGS. For example, the swivel device 40 is lifted by the crane truck 30 and connected to the connecting portion S3 located at the upper end of the screw auger S.

The slime M positioned at the bottom of the borehole H is sucked to the ground via the swivel device 40 . For example, the swivel device 40 has a tubular portion 41 to which the upper end of the screw auger S is connected, and a tubular portion 42 that is connected to the tubular portion 41 and has a space that communicates with the internal space of the tubular portion 41. .

As an example, a vacuum pump (for reverse) is connected to the tubular portion 42 , and when the vacuum pump is driven, the slime M entering the swivel device 40 through the hole E of the screw auger S passes through the tubular portion 42 . sucked by the vacuum pump. Although an example in which the swivel device 40 has the cylindrical portion 41 and the tubular portion 42 has been described above, the configuration of the swivel device 40 is not limited to this example and can be changed as appropriate.

When discharging soil from the screw auger S, as shown in FIGS. 9, 10(a) and 10(b), a mud removing member 50 is used to remove the mud R rising from the screw auger S. For example, the mud removing member 50 is attached to the rotary press fitting machine 10 . Specifically, the mud removing member 50 is attached to the lifting body 13 d of the rotary press-fit portion 13 .

The mud removing member 50 includes a mounting portion 51 attached to the rotary press-fitting machine 10, a rectangular base 52 positioned at the end of the mounting portion 51 opposite to the rotary press-fitting machine 10, and a mud remover protruding from the base 52. a portion 53; The mounting portion 51 has, for example, a pair of L-shaped angles 51b provided at one end and the other end of the base 52, respectively, and a pair of bolts 51c for fixing each L-shaped angle 51b to the rotary press-fitting machine 10.

The base 52 has, for example, a rectangular plate shape. The mud remover 53 is, for example, a wire projecting from the main surface 52b of the base 52 . The mud remover 50 has a plurality of mud removers 53 , and the plurality of mud removers 53 are arranged in a grid on the base 52 . As an example, fifteen (3×5) mud removers 53 are arranged.

The mud remover 50 is arranged so that the mud remover 53 is positioned above the blade portion S2 of the screw auger S that rotates. For example, a plurality (three as an example) of mud removers 53 are arranged vertically above the blades S2. Due to this mud remover 50, the mud R that rises on the blade portion S2 hits the mud remover 53, so that the mud remover 53 can automatically remove the mud R from the screw auger S.

After the mud R is completely discharged, as shown in FIG. 11(a), the plurality of screw augers S are removed from the excavation hole H by the crane vehicle 30 (step of removing the screw augers). Thereafter, as shown in FIG. 11(b), the reinforcing bar cage F is erected into the excavated hole H (step of erecting the reinforcing cage). At this time, a plurality of reinforcing bar cages F are erected into the excavation hole H while connecting the plurality of reinforcing bar cages F to each other by mechanical joints.

After erecting the reinforcing bar cage F, as shown in FIG. (the process of placing concrete). At this time, as shown in FIG. 12(b), the concrete N is poured while pulling out the casing C from the excavation hole H (step of pulling out the casing). After the tremie pipe T is pulled out from the excavation hole H and the concrete N hardens, the pile K is completed, and a series of steps of the pile driving method is completed.

Next, the effects obtained from the pile driving device 1 and the pile driving method according to the present embodiment will be described. As shown in FIGS. 7(a) and 7(b), in the pile driving device 1, a tubular casing C is pressed into the ground G while being rotated by the rotary press fitting machine 10, and a A screw auger excavator 20 rotates the screw auger S to excavate the ground B. A plurality of casings C are press-fitted so as to be aligned along the depth direction (vertical direction) of the ground B by the rotary press-fitting machine 10, and the plurality of screw augers S are connected to each other inside the plurality of casings C.

Above the press-fitted casing C, the screw auger excavator 20 connects another screw auger S on top of the previously placed screw auger S. Accordingly, a plurality of casings C are press-fitted by the rotary press-fitting machine 10, and the screw auger S is connected above the press-fitted casings C. As shown in FIG.

Therefore, even in a low headroom environment, the casing C can be press-fitted by the rotary press-fitting machine 10, and the screw auger S can be connected and excavated. In addition, since the connection of the screw auger S is performed above the press-fitted casing C, the connection of the screw auger S can be performed smoothly above the casing C, so that the formation of the excavation hole H and the pile driving can be performed smoothly. can be done.

As shown in FIGS. 8A and 8B, the pile driving device 1 according to the present embodiment is connected to the upper end of the screw auger S and excavated through the screw auger S ( A swivel device 40 (suction tube) for sucking slime) may be provided. In this case, the swivel device 40 can suck the slime M located at the bottom of the excavation hole H excavated by the screw auger S. Therefore, since the mud R obtained by excavation can be efficiently sucked, the excavation hole H can be formed more efficiently.

In this embodiment, as shown in FIG. 9, the screw auger S has a blade portion S2, and the rotary press-fitting machine 10 is inserted above the blade portion S2, and the screw auger S is rotated as the screw auger S rotates. It has a mud removing member 50 for dropping mud R rising S. In this case, since the mud R rising up the screw auger S can be dropped by the mud remover 50, the mud R can be collected efficiently. Further, by providing the mud removing member 50 in the rotary press-fitting machine 10, the rotary press-fitting machine 10 for press-fitting the casing C can also be used for mud removal.

A screw auger excavator 20 according to the present embodiment, as shown in FIGS. auger gripping rotary member 25 including 29; The auger gripping rotating member 25 grips one screw auger S by closing the gripping portion 28 to connect the one screw auger S to the other screw auger S located below, and opens the gripping portion 28 to connect the one screw auger S to the other screw auger S located below. By connecting a motor 29 to the screw augers S, one screw auger S and the other screw auger S are rotated.

A plurality of screw augers S can be connected to each other by the auger gripping rotating member 25 , and the plurality of screw augers S can be rotated by the motor 29 . Therefore, since the connection and rotation of a plurality of screw augers S can be efficiently performed, the excavation hole H can be formed more efficiently.

In the pile driving method according to the present embodiment, the screw auger excavator 20 rotates the screw auger S located inside the casing C to excavate the ground B, and the plurality of screw augers S inside the plurality of casings C are excavated. connected to each other. The screw auger excavator 20 connects one screw auger S to another screw auger S located below by closing the gripping portion 28, and connects the motor 29 to the one screw auger S by opening the gripping portion 28. .

Then, the motor 29 rotates the other screw auger S together with the one screw auger S. Therefore, since the plurality of screw augers S can be connected to each other and the plurality of screw augers S can be rotated by the motor 29, the connection and rotation of the plurality of screw augers S can be performed efficiently. Therefore, the formation of the excavation hole H and the pile driving can be performed efficiently. As a result, in this embodiment, the disposal cost of the mud R can be reduced, and the driving of 250 piles K at the site A can be efficiently performed.

The embodiments of the pile driving device and the pile driving method according to the present disclosure have been described above. However, the present invention is not limited to the above-described embodiments, and can be modified as appropriate without changing the gist of the claims. That is, the configuration, shape, size, number, material and arrangement of each part of the pile driving device according to the present disclosure, and the contents and order of the steps of the pile driving method can be changed as appropriate within the scope of the above gist. It is possible.

For example, in the above-described embodiment, the site A where a plurality of new piles K are driven into the portion between the pair of elevated road bridges A1 in plan view and the bridge piers are erected on the piles K has been described. However, the pile driving device and the pile driving method according to the present disclosure are applicable to sites other than site A.

REFERENCE SIGNS LIST 1 Pile driving device 10 Rotary press-fitting machine 11 Crawler 12 Cabin 13 Rotary press-fitting unit 13A Leader 13B Press-fitting machine body 13b Support stay 13c Support arm 13d Lifting body, 13f... press-fit part, 20... screw auger excavator, 21... crawler, 22... cabin, 22b... front part, 23... cylinder, 23b... upper end, 24... leader, 25... auger gripping rotary member, 26... cable, 27... Connecting member 28... Grasping part 28b... Body part 28c... Arm part 28d... Shaft 28f... Claw part 29... Motor 30... Crane vehicle 40... Swivel device (suction tube) 41... Cylinder Shaped part 42 Tubular part 50 Mud remover 51 Mounting part 51b L-shaped angle 51c Bolt 52 Base 52b Main surface 53 Mud remover 60 Pump truck A ... site, A1 ... elevated road bridge, B ... ground, C ... casing, E ... hole, F ... reinforcing bar cage, G ... ground, H ... excavation hole, K ... pile, L ... axis line, M ... slime, N ... concrete , R... Mud, S... Screw auger, S1... Shaft part, S2... Blade part, S3... Connection part, S4... Groove part, T... Tremy tube.

Claims (5)

a rotary press-fitting machine that press-fits the tubular casing into the ground while rotating;
a screw auger excavator holding a screw auger inserted inside the casing and rotating the screw auger positioned inside the casing to excavate the ground;
with
The rotary press-fitting machine press-fits the plurality of casings so that the plurality of casings are aligned along the depth direction of the ground,
The plurality of screw augers are connectable to each other,
The screw auger excavator connects another screw auger on the screw auger previously arranged above the press-fitted casing ,
The rotary press-fitting machine and the screw auger excavator are capable of traveling independently of each other,
Pile driver. A suction pipe connected to the upper end of the screw auger and sucking mud excavated through the screw auger,
The pile driving device according to claim 1. The screw auger has a blade portion,
The rotary press-fitting machine has a mud removing member that is inserted above the blade portion and removes mud that rises in the screw auger as the screw auger rotates,
The pile driving device according to claim 1 or 2. The screw auger excavator has an auger gripping rotating member including an openable and closable gripping portion that grips the screw auger and a motor that rotates the screw auger,
The auger gripping rotary member is
By closing the gripping portion, one of the screw augers is gripped to connect one of the screw augers to the other screw auger located below;
By opening the gripping portion and connecting the motor to one of the screw augers, one of the screw augers and the other of the screw augers are rotated,
The pile driving device according to any one of claims 1 to 3. A pile driving method in which a screw auger that is inserted into a tubular casing that is pressed into the ground by a rotary press fitting machine is rotated by a screw auger excavator to form an excavation hole for driving a pile,
The screw auger excavator has an auger gripping rotating member including an openable and closable gripping portion that grips the screw auger and a motor that rotates the screw auger,
gripping one of the screw augers by closing the gripping portion;
A step of connecting one of the screw augers to the other screw auger located below;
a step of opening the gripping portion and connecting the motor to one of the screw augers;
a step of causing the motor to rotate one of the screw augers and the other of the screw augers ;
The rotary press-fitting machine and the screw auger excavator are capable of traveling independently of each other ,
Piling method.

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