JP2017071907A - Device to reduce penetration resistance, penetration structure of steel pipe pile, and construction method for steel pipe pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solution, in which a simple structure is used to suppress blockage resistance of soil inside pipes and to reduce penetration resistance, enabling the improvement of workability and the miniaturization of devices required for driving piles.SOLUTION: A device to reduce penetration resistance in this invention is configured to be attached to a steel pipe pile 2 which is penetrated into the ground by a pile-driving unit and to reduce penetration resistance of the steel pipe pile 2, comprising: a vibration rod 3; a vibrator 4 to which the vibration rod 3 is connected extending downward; a splice plate 5 with which the vibrator 4 is detachably attached to the steel pipe pile 2; and a vibration-proof part 6 which is provided between the vibrator 4 and the splice plate 5. While the vibrator 4 is attached to the steel pipe pile 2, the vibration rod 3 is positioned in the inner side of the steel pipe pile 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a penetration resistance reducing device, a steel pipe pile penetration structure, and a steel pipe pile construction method.

  Conventionally, as a method of placing steel pipe piles, there is a method of penetrating the steel pipe pile into the ground using hammering, vibration using a vibro hammer, and rotary press-fitting, but as the pile penetrates, it enters the inside of the steel pipe pile. As a result, the friction force between the clogged soil and the inner surface of the pile increases, resulting in penetration resistance, and finally the pile tip is blocked. And since penetration resistance becomes large by obstruction | occlusion, the method to drive the pile which suppresses the fall of workability | operativity as shown, for example in patent document 1 is known.

  In Patent Document 1, using a vibrator installed on the inner surface of the steel pipe sheet pile, by applying vibration to the steel pipe sheet pile via the vibration transmission part, the soil and sand adhering to the tips and claws of the steel pipe pile is shaken off, It describes about the structure which raises the blockage suppression of a steel pipe pile, and the fitting nature of a steel pipe sheet pile.

JP2013-204408A

However, the conventional pile construction method has the following problems:
That is, in Patent Document 1, since the steel pipe sheet pile is vibrated through a vibration transmission unit using a vibration exciter, the vibration force required for the vibration exciter is large. It has been demanded to reduce the energy.
Moreover, in the case of patent document 1, there exists a problem that the reaction force apparatus of a shaker with a big excitation force and the crane for suspending a shaker are needed, and the apparatus concerning construction becomes large. There was room for improvement in that regard.

  The present invention has been made in view of the above-mentioned problems, and it is possible to improve the workability by reducing the penetration resistance by suppressing the clogging resistance of the pipe soil with a simple structure. It is an object of the present invention to provide a penetration resistance reducing device, a steel pipe pile penetration structure, and a steel pipe pile construction method capable of downsizing a necessary device.

  In order to achieve the above object, the penetration resistance reducing device according to the present invention is a penetration resistance reducing device that is attached to a steel pipe pile that is penetrated into the ground by a pile driving device, and reduces the penetration resistance of the steel pipe pile, A vibration rod, a vibrator connected to the vibration rod so as to extend downward, a mounting portion for detachably mounting the vibrator on the steel pipe pile, and the vibrator A vibration isolator interposed between the mounting portion and the vibration rod is inserted into the steel pipe pile in a state where the vibration exciter is attached to the steel pipe pile. It is said.

  Moreover, the penetration structure of the steel pipe pile which concerns on this invention is equipped with the penetration resistance reduction apparatus mentioned above to the upper part of the said steel pipe pile penetrated into the ground.

  Moreover, the construction method of the steel pipe pile which concerns on this invention is a construction method of the steel pipe pile using the penetration structure of the steel pipe pile mentioned above, Comprising: The said vibration exciter is attached to the said steel pipe pile and the said vibration rod is attached to the said steel pipe. The step of inserting the inside of the pile, the step of driving the vibration exciter and vibrating the vibrating rod by the driving force, and applying the hammer, applying the vibration, or rotational press-fitting to the steel pipe pile And a step of placing the steel pipe pile by performing.

In the present invention, when the steel pipe pile is penetrated into the ground, a vibration exciter is attached to the steel pipe pile by the attachment portion, and the vibration rod connected to the vibration exciter is inserted and arranged inside the steel pipe pile. Using the weight of the pile as a reaction force of the shaker, the steel pipe pile can be penetrated into the ground while only the vibrating rod is vibrated by the shaker. At this time, by positioning the tip of the vibration rod in the vicinity of the tip of the steel pipe pile, it is possible to penetrate the steel pipe pile while loosening the soil that has entered the pipe of the steel pipe pile with the vibration rod. Therefore, obstruction | occlusion in a steel pipe pile can be suppressed, the penetration resistance of a steel pipe pile can be reduced, and construction efficiency can be improved.
And in this invention, since the vibration isolator is provided between the vibration exciter and the attachment part with which a steel pipe pile is mounted | worn, the vibration of a vibration exciter is not transmitted to a steel pipe pile or a pile driving device. Since only the vibrating rod can be vibrated, the energy of the exciting force can be reduced.
Moreover, by suppressing the penetration resistance of steel pipe piles, it is possible to reduce the driving power (for example, power due to vibration, dropping, and rotary press-fitting) of the pile driving device necessary for the steel pipe pile driving. The installation apparatus can be reduced in size.

  Further, in the present invention, the vibration exciter is attached to the steel pipe pile by the attachment portion, and a simple reaction force support structure for taking the reaction force of the vibration exciter against the steel pipe pile is obtained, and the vibration rod is more than the steel pipe pile. Since it is small in diameter and the shaker itself can be reduced in size, there is an advantage that a large reaction force device provided separately from the shaker is unnecessary, and a crane during placement is unnecessary.

  In addition, in the present invention, in addition to the press-fitting of the steel pipe pile, it is a configuration that gives vibration by the vibration rod, but the vibrating rod that vibrates is located in the steel pipe pile and gives vibration only to the ground inside the steel pipe pile. The noise and vibration can be reduced compared to the case where the steel pipe pile itself is struck or penetrated by a vibro hammer.

  In the penetration resistance reducing device according to the present invention, it is preferable that the vibration exciter is disposed inside the steel pipe pile.

In this case, since a vibration exciter is not provided outside the steel pipe pile, the entire placing structure can be made compact, and the construction space can be reduced.
Moreover, in this invention, since the sound exciter is located inside a steel pipe pile and the soundproof wall covered with the steel pipe is comprised, the soundproof effect can be acquired.

  Further, in the penetration resistance reducing apparatus according to the present invention, the mounting portion is an attachment plate fixed to the inner surface of the steel pipe pile, and the vibration exciter passes through the vibration isolation portion with respect to the attachment plate. And may be detachably attached.

  In this case, the attachment part can be easily attached to and detached from the inner surface of the steel pipe pile by attaching the attachment plate to the inner surface of the steel pipe pile in advance. Therefore, the penetration resistance reducing device can be provided on the steel pipe pile or the efficiency of the work of exchanging can be improved.

  Moreover, the penetration resistance reduction apparatus which concerns on this invention WHEREIN: The said mounting part may have an overhang | projection jig | tool which protrudes toward the side from the said vibration proof part and fits the upper part of the said steel pipe pile.

  In this case, since the overhanging jig provided on the vibration exciter via the vibration isolator is externally fitted to the upper portion of the steel pipe pile, positioning at the time of mounting can be easily performed.

  Further, in the penetration resistance reducing device according to the present invention, the mounting portion is configured such that one end in the radial direction of the steel pipe pile is fixed to the shaker via the vibration isolating portion, and a gripping portion is provided at the other end in the radial direction. The expansion-contraction apparatus which expands and contracts along the said radial direction may be sufficient.

  In this case, for example, the exciter can be fixed to the steel pipe pile by driving the expansion / contraction device by hydraulic power and extending the gripping portion in the radial direction and pressing it against the inner surface of the steel pipe pile. This eliminates the need for troublesome work such as bolt fastening. Moreover, since it becomes possible to hold | grip a holding part to any location of the inner surface of a steel pipe pile, the positioning operation | work at the time of fixation can be performed easily.

  Moreover, the penetration structure of the steel pipe pile which concerns on this invention has an outer shell steel pipe which can be coaxially connected with respect to the upper end of the said steel pipe pile, and the said vibration exciter is arrange | positioned inside the said outer shell steel pipe. It is preferable.

  In the penetration structure of the steel pipe pile according to the present invention, the penetration resistance reducing device can be attached / detached by attaching / detaching the outer shell steel pipe to / from the steel pipe pile to be penetrated by attaching a vibration machine to the inner side of the outer shell steel pipe in advance. can do.

  Moreover, it is preferable that the penetration structure of the steel pipe pile which concerns on this invention is provided with the cover member which obstruct | occludes the upper end opening of the said steel pipe pile.

  In this case, since the upper end opening of the steel pipe pile is closed by the lid member during the placement of the steel pipe pile, the noise generated from the vibration exciter and the vibrating rod can be suppressed, and an excellent soundproofing effect can be achieved. In addition, it can be applied even under restrictive conditions such as urban areas and nighttime.

  According to the penetration resistance reducing device, the steel pipe pile penetration structure, and the steel pipe pile construction method of the present invention, the workability is improved by suppressing the block resistance of the soil in the pipe and reducing the penetration resistance with a simple structure. In addition, it is possible to reduce the size of the apparatus required for pile driving.

It is the partially broken side view which shows the penetration structure of the penetration resistance reduction apparatus and steel pipe pile by the 1st Embodiment of this invention, Comprising: It is the sectional view on the AA line shown in FIG. (A) is the figure which looked at the penetration structure of the steel pipe pile shown in FIG. 1 from the upper direction, (b) is a figure which shows the state which fixed the attachment plate only to the steel pipe pile in FIG. 2 (a). It is a principal part side view which shows the connection part of a vibration exciter and a vibration rod. (A)-(c) is a figure which shows the construction method which mounts | wears a steel pipe pile with a penetration resistance reduction apparatus. (A), (b) is a figure which shows the other construction method of mounting | wearing a steel pipe pile with a penetration resistance reducing apparatus. It is a longitudinal cross-sectional view which shows the construction method of the steel pipe pile by a hitting method. It is a longitudinal cross-sectional view which shows the construction method of the steel pipe pile by a vibro hammer construction method. It is a longitudinal cross-sectional view which shows the construction method of the steel pipe pile by a rotary press-fit method. It is the partially broken side view which shows the penetration resistance reduction apparatus by 2nd Embodiment, and the penetration structure of a steel pipe pile, Comprising: It is a figure which shows the state before attaching an outer shell steel pipe to a steel pipe pile. It is a figure which shows the state which attached the outer shell steel pipe shown in FIG. 9 to the steel pipe pile. It is the partially broken side view which shows the penetration resistance reduction apparatus by 3rd Embodiment, and the penetration structure of a steel pipe pile, Comprising: It is a figure which shows the state before attaching an overhanging jig to a steel pipe pile. It is a figure which shows the state which attached the overhang | projection jig | tool shown in FIG. 11 to the steel pipe pile. It is the figure which looked at the penetration structure of the steel pipe pile shown in FIG. 12 from upper direction. It is a figure which shows the structure of the penetration resistance reduction apparatus by 4th Embodiment, Comprising: (a) is the figure which looked at only the penetration resistance reduction apparatus from the upper direction, (b) attached the penetration resistance reduction apparatus to the steel pipe pile. It is the figure which looked at the state from the upper part. It is the partially broken side view which shows the penetration resistance reduction apparatus by the modification and the penetration structure of a steel pipe pile, Comprising: It is the figure which provided the cover member in the steel pipe pile. (A), (b) is a side view which shows the principal part of the rod connection part by a modification. (A), (b) is a side view which shows the principal part of the rod connection part by a modification.

  Hereinafter, a penetration resistance reducing device, a steel pipe pile penetration structure, and a steel pipe pile construction method according to embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
As shown in FIG.1 and FIG.2 (a), the penetration resistance reduction apparatus 1 by this Embodiment is a steel pipe penetrated to the ground by giving a hit | damage, vibration, or rotary press-fitting with a pile driving device. It is an apparatus for reducing the penetration resistance of the steel pipe pile 2 attached to the pile 2. Here, the pile driving device described above is a pile driving machine that drops a weight on the upper end of the steel pipe pile 2 in the case of hammering, and a vibration press-fitting device such as a vibratory hammer in the case of vibration. In this case, a rotary press-fitting device is employed.
The steel pipe pile 2 is formed of, for example, a cylindrical steel pipe having a diameter of 1000 mm and opened at the upper and lower ends. A plurality of steel pipe piles 2 are joined to each other by welding in the direction of the pile axis O, and are placed on the ground by being added on the coaxial line.

  The penetration resistance reducing device 1 includes an oscillating rod 3, an oscillating device 4 connected to the oscillating rod 3 so as to extend downward, and an oscillating rod 3 positioned in the steel pipe pile 2. An attachment plate 5 (attachment portion) (see FIG. 2B) for detachably attaching the machine 4 to the steel pipe pile 2; a vibration isolation portion 6 interposed between the vibration exciter 4 and the attachment plate 5; It is equipped with.

  Here, in this embodiment, each central axis of the steel pipe pile 2 and the vibration rod 3 is arrange | positioned on the common axis. Hereinafter, this common axis is referred to as a pile axis O, the penetration tip side of the steel pipe pile 2 along the pile axis O direction is referred to as a lower side, and the penetration base end side is referred to as an upper side. Moreover, in the planar view which looked at the steel pipe pile 2 from the pile axis | shaft O direction, the direction orthogonal to the pile axis | shaft O is called radial direction, and the direction which goes around the pile axis | shaft O is called circumferential direction.

  The vibration exciter 4 employs, for example, a well-known hydraulic vibro hammer used for placing steel sheet piles and the like, and has a rod connection portion 41 that removably connects the upper end of the vibration rod 3 on the lower surface side. Yes. The vibration exciter 4 is connected to the side surface 4a with a hydraulic hose 42 extending from a hydraulic pump or the like installed outside the steel pipe pile 2, thereby driving the vibration exciter 4 and connecting the vibration rod 3 to the pile. Vibrates in the vertical direction along the axis O direction. And the vibration exciter 4 becomes a magnitude | size which can be arrange | positioned inside the steel pipe pile 2 with the vibration isolator 6 and the attachment board 5 which were mentioned above. The rod connecting portion 41 is formed with a female screw (not shown) for connecting the vibration rod 3 with a bolt 43 (see FIG. 3).

For example, a steel pipe having an outer diameter of 100 mm is used as the vibration rod 3, and the rod tip 3 a (lower end) has a conical shape. The vibration rod 3 is provided such that the central axis coincides with the pile axis O. The vibration rod 3 is extended by adding in the direction of the pile axis O, and the rod tip 3 a is set to a length dimension located near the lower end 2 a of the steel pipe pile 2.
Further, as shown in FIG. 3, the vibration rod 3 has a connection plate 31 having a through hole fixed to the upper end 3 b, and the connection plate 31 faces the rod connection portion 41 of the vibration exciter 4 so as to face the bolt 43. Are joined by.

  As shown in FIG. 1 and FIG. 2A, the vibration isolator 6 includes an elastic rubber anti-vibration rubber 61 and an inner fixing that is fixed to one end of the anti-vibration rubber 61 and fixed to the vibration exciter 4. A plate 62 and an outer fixing plate 63 that is sandwiched and fixed between the other end of the vibration isolating rubber 61 and the attachment plate 5 are provided. The vibration isolator 6 is fixed to the side surface 4 a of the vibration exciter 4 and is disposed at a position facing each other on both sides of the vibration exciter 4. The anti-vibration rubber 61 is not particularly limited to a shape such as a circle or a rectangle when viewed from the side in the radial direction.

  The inner fixing plate 62 and the outer fixing plate 63 are made of steel plates, and each protrudes outward from the antivibration rubber 61 in a side view. The inner fixing plate 62 is provided with a bolt hole penetrating through an outer peripheral portion protruding from the vibration isolating rubber 61, and is fixed to the side surface 4 a of the vibration exciter 4 with a fixing bolt 64 through the bolt hole. The outer fixing plate 63 is provided with a bolt hole penetrating through an outer peripheral portion that protrudes outward from the anti-vibration rubber 61, and the fixing bolt 65 passes through the bolt hole to the inner surface 2 b of the steel pipe pile 2 through the attachment plate 5. It is fixed. Therefore, a bolt hole into which the fixing bolt 65 can be inserted is formed in the steel pipe pile 2.

  As shown in FIGS. 2 (a) and 2 (b), the attachment plate 5 is made of a steel material that is fixed to the inner surface 2 b of the steel pipe pile 2 and has substantially the same shape as the outer fixing plate 63. A similar bolt hole is provided in a position corresponding to the hole. A spacer 51 corresponding to the distance from the inner surface 2 b of the steel pipe pile 2 is provided on the outer surface 5 a of the attachment plate 5. The spacer 51 is provided with a similar bolt hole penetrating at a position corresponding to the bolt hole of the attachment plate 5. The vibration exciter 4 is detachably attached to the attachment plate 5 fixed to the steel pipe pile 2 via the spacer 51 via the vibration isolator 6.

Next, the concrete construction method of the steel pipe pile 2 is demonstrated.
First, as shown to Fig.4 (a), the pile placing apparatus not shown is installed on the ground G used as the placement position of the steel pipe pile 2, and the steel pipe pile 2 to be placed first is set. Then, for example, the penetration resistance reducing device 1 in which the vibration rod 3, the vibration exciter 4, the vibration isolator 6, and the attachment plate 5 are integrally assembled by ground assembly or the like is used as a crane (in FIG. 4, only the suspension wire W of the crane). Is suspended), and as shown in FIG. 4 (b), the steel pipe pile 2 is made to enter inward from the upper end opening and disposed at a predetermined position. At this time, the rod tip 3a of the vibration rod 3 is in a predetermined position with respect to the lower end 2a of the steel pipe pile 2 (in FIGS. 4B and 4C, the rod tip 3a is shallower than the lower end 2a of the steel pipe pile 2). It fixes to the predetermined position in the steel pipe pile 2 so that it may become. As shown in FIG. 4 (c), using an aerial work vehicle or the like, the outer fixing plate 63 and the steel pipe pile 2 of the vibration isolator 6 shown in FIG. 1 are fixed via the attachment plate 5 and the spacer 51. By fixing with the bolt 65, the penetration resistance reducing device 1 is mounted on the upper portion of the steel pipe pile 2, and the preparation for placing is completed.

  In addition, it does not restrict | limit to the attachment method which mounts the penetration resistance reduction apparatus 1 with respect to the steel pipe pile 2 arrange | positioned vertically in this way, and it places as shown in FIG. 5 (a), (b) A method of attaching the penetration resistance reducing device 1 in a state where the steel pipe pile 2 is placed horizontally may be used. That is, the penetration resistance reduction device 1 having the vibration rod 3 attached to the vibration exciter 4 is conveyed in the horizontal direction by using the conveyance carriage F and enters the inside of the steel pipe pile 2 to reduce the penetration resistance at a predetermined position. The apparatus 1 is attached to the steel pipe pile 2. Then, the horizontal steel pipe pile 2 to which the penetration resistance reducing device 1 is mounted is installed vertically at a predetermined penetration position, and the preparation for placing is completed. As described above, when the penetration resistance reducing device 1 is attached to the horizontally placed steel pipe pile 2, assembly work at a high place is eliminated, and construction efficiency can be improved.

  Next, the exciter 4 of the penetration resistance reducing device 1 is driven inside the steel pipe pile 2 to transmit the vibration to the vibrating rod 3 to penetrate into the ground, and is driven until reaching the support layer by the pile driving device. To do. As the driving method using the pile driving device at this time, the hammering method shown in FIG. 6, the vibratory hammer method shown in FIG. 7, the rotary press-fitting method shown in FIG.

In the case of the impact method, as shown in FIG. 6, the weight 11 is dropped on the pile head of the steel pipe pile 2, so that the position of the upper end 4 b of the vibration exciter 4 is lower than the upper end 2 c of the steel pipe pile 2. Deploy.
In the case of the vibratory hammer method, as shown in FIG. 7, the vibrator 4 is gripped by the vibratory hammer 12 to apply vibration to the pile head 2, so that the position of the upper end 4 b of the vibrator 4 is higher than the upper end 2 c of the steel pipe pile 2. Place it so that it is lower.
In addition, when the hydraulic hose 42 (see FIG. 1) that allows the upper end 2c of the steel pipe pile 2 to pass is obstructed in the striking method or the vibro hammer method, a hose hole that passes through the upper portion of the steel pipe pile 2 (not shown). And the hydraulic hose 42 may be passed through this hose hole.

In the case of the rotary press-fitting method, as shown in FIG. 8, since the outer peripheral surface of the steel pipe pile 2 is gripped by the chuck of the rotary press-fitting machine 13, the position of the pile head of the steel pipe pile 2 is not limited, and the vibration exciter The upper end 4 b of 4 may protrude from the upper end of the steel pipe pile 2.
In the rotary press-fitting method, since the penetration resistance reducing device 1 also rotates with the rotation of the steel pipe pile 2, the hydraulic hose 42 is provided with a swivel joint (not shown).

  In addition, as shown in FIG. 1, it is necessary to sequentially add a plurality of steel pipe piles 2 to be placed in accordance with the penetration depth. Change. That is, the penetration resistance reducing apparatus 1 is removed from the upper part of the penetrated steel pipe pile 2 while being lifted by the crane together with the vibration rod 3, and the penetration resistance reducing apparatus 1 is mounted inside the newly added steel pipe pile 2. At this time, the vibration rod 3 is not removed with the penetration resistance reducing device 1, but is separated by the rod connecting portion 41 of the vibration exciter 4 and left in the steel pipe pile 2 and added to the upper end of the left vibration rod 3. It is also possible to connect the vibrating rod 3.

In addition, although the position of the rod front-end | tip 3a of the vibration rod 3 in penetration of the steel pipe pile 2 is made into the position shallower than the lower end 2a of the steel pipe pile 2 in FIG.4 (b) etc., not only this but FIG. As shown in FIG. 8, it may be a position deeper than the lower end 2a of the steel pipe pile 2. In this case, during the penetration of the steel pipe pile 2, the vibrating rod 3 is vibrated by the vibration exciter 4, so that the earth and sand entering the steel pipe pile 2 (reference numeral Ga in FIGS. 6 to 8) and the steel pipe pile 2 directly below. The ground (symbol Gb) can be loosened. Therefore, the penetration resistance of the perpendicular direction which acts on the steel pipe pile 2 penetrated can be made small.
More specifically, the position of the rod tip 3a of the vibration rod 3 is as close as possible to the lower end 2a of the steel pipe pile 2, and the upper limit is a position away from the lower end 2a of the steel pipe pile 2 by twice the outer dimension of the steel pipe pile 2. It is effective.

  Next, after the vibration rod 3 reaches the target depth and after the steel pipe pile 2 reaches the target depth, for example, the outer fixing plate 63 is separated from the attachment plate 5 and the penetration resistance reducing device 1 is connected to the steel pipe pile 2. From the inside of the steel pipe pile 2, the vibrating rod 3 is vibrated while being lifted by a crane. Then, a void is formed in the earth and sand where the vibrating rod 3 is pulled out, the surrounding ground falls, and the ground is further solidified by the vibration of the vibrating rod 3, so that the density in the loose ground is recovered, and the steel pipe pile It is possible to recover the strength of the earth and sand Ga that has entered the ground Gb and the steel pipe pile 2 immediately below. And construction is completed by pulling up the vibration rod 3 from the steel pipe pile 2 completely.

Next, the effect | action of the penetration resistance reduction apparatus mentioned above, the penetration structure of a steel pipe pile, and the construction method of a steel pipe pile is demonstrated.
In the present embodiment, as shown in FIG. 1, when the steel pipe pile 2 is penetrated into the ground, the vibration connected to the vibration exciter 4 by attaching the vibration exciter 4 to the steel pipe pile 2 by the attachment plate 5. The rod 3 is placed in the steel pipe pile 2. And the steel pipe pile 2 can be penetrated into the ground, making only the vibration rod 3 vibrate from the shaker 4 by using the weight of the steel pipe pile 2 as a reaction force of the shaker 4. At this time, as shown in FIGS. 6 to 8, the vibration rod 3 is positioned in the vicinity of the tip of the steel pipe pile 2, thereby loosening the soil (earth and sand Ga) entering the pipe of the steel pipe pile 2 with the vibration rod 3. The pile 2 can be penetrated. Therefore, obstruction | occlusion in the steel pipe pile 2 can be suppressed, the penetration resistance of the steel pipe pile 2 can be reduced, and construction efficiency can be improved.

Moreover, in this Embodiment, since the vibration isolator 6 is provided between the vibration exciter 4 and the attachment plate 5 with which the steel pipe pile 2 is mounted | worn, the vibration of the vibration exciter 4 is the steel pipe pile 2 or Since it is not transmitted to the pile driving device and only the vibrating rod 3 can be vibrated, the vibration noise of the steel pipe pile 2 can be suppressed, and the steel pipe pile 2 can be provided with stability.
Moreover, by suppressing the penetration resistance of the steel pipe pile 2, it is possible to reduce the driving power of the pile driving device necessary for the driving of the steel pipe pile 2 (for example, power due to vibration, dropping, and rotary press-fitting), The pile driving device can be downsized.

  In the present embodiment, the vibration exciter 4 is attached to the steel pipe pile 2 with a bolt using the attachment plate 5 and the reaction force of the exciter 4 is taken against the steel pipe pile 2. In addition to the force support structure, the vibration rod 3 is smaller in diameter than the steel pipe pile 2 and the vibration exciter 4 itself can be reduced in size, so that a large reaction force device provided separately from the vibration exciter 4 is not required. In addition, there is an advantage that a crane during placement is not required.

  Furthermore, in this Embodiment, when constructing the steel pipe pile 2 by rotary press fitting, it is the structure which gives the vibration by the vibration rod 3, but the vibration rod 3 which vibrates is located in the steel pipe pile 2, and the steel pipe pile 2 of Since vibration is applied only to the internal ground, the vibration can be suppressed to a smaller value than when the steel pipe pile 2 itself is struck or penetrated by a vibro hammer.

  Moreover, in the penetration resistance reduction apparatus 1 of this Embodiment, since it becomes the structure by which the vibration exciter 4 is not provided in the outer side of the steel pipe pile 2, it can attain downsizing as the whole placing structure, and construction space can be achieved. Can be small. And since the sound-insulation wall in which the vibration exciter 4 was located inside the steel pipe pile 2 and was covered with the steel pipe was comprised in this way, a soundproof effect can be acquired.

  Furthermore, in this embodiment, by attaching the attachment plate 5 to the inner surface 2 a of the steel pipe pile 2 in advance, the outer fixing plate 63 can be easily detached from the attachment plate 5. Therefore, the penetration resistance reducing device 1 can be provided to the steel pipe pile 2 or the work for exchanging can be made more efficient.

  As described above, the penetration resistance reducing device, the steel pipe pile penetration structure, and the steel pipe pile construction method according to the present embodiment have a simple structure that suppresses the clogging resistance of the soil in the pipe and reduces the penetration resistance. In addition, it is possible to reduce the size of the device required for pile driving.

  Next, other embodiments of the penetration resistance reducing device, the steel pipe pile penetration structure, and the steel pipe pile construction method of the present invention will be described based on the attached drawings, but the same as the first embodiment described above. Alternatively, the same reference numerals are used for the same members and parts, and the description thereof is omitted, and a configuration different from the first embodiment will be described.

(Second Embodiment)
As shown in FIGS. 9 and 10, the penetration resistance reducing device 1 and the steel pipe pile penetration structure T according to the second embodiment are an outer shell that can be coaxially connected to the upper end 2 c of the steel pipe pile 2 to be penetrated. A steel pipe 20 is provided, and the vibration exciter 4 of the penetration resistance reducing device 1 is arranged inside the outer shell steel pipe 20. In 2nd Embodiment, the structure of the penetration resistance reduction apparatus 1 is the same structure as 1st Embodiment mentioned above.
The outer shell steel pipe 20 is provided with a height dimension in which the vibration exciter 4 is accommodated inside. The outer shell steel pipe 20 is fixed by welding with a steel connecting cylinder 21 fitted around the upper portion of the steel pipe pile 2 and through which a plurality of bolt holes are penetrated. The connecting cylinder 21 has a larger diameter than the outer shell steel pipe 20, extends downward from the lower end of the outer shell steel pipe 20, and is detachably fixed to the steel pipe pile 2 with bolts 22.

  In the case of 2nd Embodiment, since it becomes the structure which attaches and detaches the outer shell steel pipe 20 with respect to the steel pipe pile 2, attachment / detachment with the steel pipe pile 2 and the penetration resistance reduction apparatus 1 becomes unnecessary, and attachment / detachment work is a steel pipe. Since it can carry out easily from the outer side of the pile 2, the working time can be further shortened.

  In addition, the connection structure of the steel pipe pile 2 and the outer shell steel pipe 20 is not limited to 2nd Embodiment, Other structures may be sufficient. For example, the connecting cylinder 21 is not limited to the one provided over the entire circumference, and may be provided partially along the circumferential direction. Furthermore, although the connecting cylinder 21 is welded to the outer shell steel pipe 20, it may be a separated attachment plate material. In this case, the joining plate material is brought into contact with the steel pipe pile 2 and the outer shell steel pipe 20 and is bolted to both.

(Third embodiment)
As shown in FIGS. 11 to 13, the penetration resistance reducing device 1 </ b> A according to the third embodiment protrudes from the outer fixing plate 63 of the vibration isolator 6 toward the side and is externally fitted to the upper portion of the steel pipe pile 2. The overhanging jig 7 (mounting portion) is provided. The overhanging jig 7 includes an overhanging piece 71 that protrudes in the radial direction from the outer fixing plate 63 of each of the pair of vibration isolating parts 6, and a hanging piece 72 that extends downward from the protruding end of the overhanging piece 71. The L shape which consists of. The overhanging jig 7 is set so that the distance between the pair of hanging pieces 72, 72 at the opposing position matches the outer diameter of the steel pipe pile 2. In the state where the overhanging jig 7 is externally fitted to the steel pipe pile 2, the overhanging piece 71 comes into contact with the upper end 2 c of the steel pipe pile 2 from above, and the drooping piece 72 is positioned outside the steel pipe pile 2 and the dripping piece 72. And the steel pipe pile 2 are detachably joined by a bolt 73.

  In the case of the third embodiment, the penetration resistance reducing device has a simple configuration in which the overhanging jig 7 provided on the vibration exciter 4 via the vibration isolator 6 is fitted on the upper portion of the steel pipe pile 2. 1A can be attached to the steel pipe pile 2. That is, by placing the overhanging piece 71 of the overhanging jig 7 on the upper end of the steel pipe pile 2, the heights of the bolt holes (not shown) of the hanging piece 72 and the steel pipe pile 2 coincide with each other. The positioning operation can be easily performed.

(Fourth embodiment)
As shown in FIGS. 14 (a) and 14 (b), the penetration resistance reducing apparatus 1B according to the fourth embodiment is applied to the splicing plate 5 (see FIG. 2 (a)) of the first embodiment described above. Instead, the expansion device 9 (mounting portion) is provided. The expansion and contraction device 9 is provided on both sides of the vibration exciter 4, and one end 9a in the radial direction of the steel pipe pile 2 is fixed to the vibration exciter 4 via the vibration isolator 6, and is held by the other end 9b in the radial direction. For example, it has a jack 92 such as a hydraulic type or an electric type that includes a portion 91 and expands and contracts along the radial direction.

  In this case, the exciter 4 is fixed to the steel pipe pile 2 by, for example, driving the expansion / contraction device 9 by hydraulic power, extending the gripping portion 91 in the radial direction, and pressing it against the inner surface 2b of the steel pipe pile 2. Therefore, the troublesome work of fastening the bolt to the steel pipe pile 2 is not required. Moreover, since it becomes possible to make the holding part 91 hold | grip to any location of the inner surface 2b of the steel pipe pile 2, the positioning operation | work at the time of fixation can be performed easily.

  The embodiment of the penetration resistance reducing device, the steel pipe pile penetration structure, and the steel pipe pile construction method according to the present invention has been described above, but the present invention is not limited to the above-described embodiment, Changes can be made as appropriate without departing from the scope.

  For example, in the present embodiment, the upper end opening of the steel pipe pile 2 or the upper end opening of the outer shell steel pipe 20 in the second embodiment is opened, but the lid for closing the upper end opening as shown in FIG. By providing the member 8, the soundproofing effect may be further enhanced. As the lid member 8, a soundproof cover using a soundproof sheet, a lid made of a steel material that can be attached to the upper portion of the steel pipe pile 2, or the like can be used. In addition, when the lid member 8 is provided, the hydraulic hose 42 connected to the vibration exciter 4 is provided with a through hole in the lid member 8 or the steel pipe pile 2 (in FIG. 15, the through hole is provided in the lid member 8. And the hydraulic hose 42 may be inserted using this through hole.

  In addition, as a configuration of the vibration isolating portion, in the above-described embodiment, the vibration isolating rubber 61, the inner fixing plate 62, and the outer fixing plate 63 are configured. It is also possible to use a configuration using materials.

Furthermore, in this Embodiment, although the rod connection part 41 which connects the upper end of the vibration rod 3 so that attachment or detachment is possible with a volt | bolt is provided, it is not restrict | limited to such a bolt connection. For example, as shown in FIGS. 16 and 17, the upper portion of the vibration rod 3 is gripped by chucks 44 and 45 provided on the lower surface side of the vibration exciter 4, and the vibration rod 3 is connected coaxially with the pile axis O. It may be a configuration.
A rod connecting portion 41A shown in FIGS. 16A and 16B is applied when the outer diameter of the vibrating rod 3 is large, and a pair of chucks 44A and 44B are provided at positions facing each other across the pile shaft. The cylindrical upper end portion of the vibration rod 3 is sandwiched between 44A and 44B.
The rod connecting portion 41B shown in FIGS. 17A and 17B is applied when the outer diameter of the vibration rod 3 is small, and one chuck 45 is provided at the position of the pile shaft O, and the chuck 45 vibrates. The plate 32 fixed so as to pass through the center of the rod 3 is sandwiched.

  Furthermore, in the third embodiment described above, the overhanging jig 7 is provided in a part of the circumferential direction (the pair of overhanging pieces 71 and the hanging piece 72), but this is not limitative. It will never be done. For example, three or more projecting pieces 71 and drooping pieces 72 may be provided, or may not be provided partially in the circumferential direction but may be provided in a lid shape over the entire circumference.

  In addition, about the structure, such as the length of the steel pipe pile 2 and the vibration rod 3, and a diameter dimension, it can set suitably.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1, 1A, 1B Penetration resistance reduction apparatus 2 Steel pipe pile 2a Lower end 2b Inner surface 2c Upper end 3 Vibration rod 3a Rod tip 4 Exciter 4a Side surface 5 Attachment plate (mounting part)
6 Anti-vibration part 7 Overhang jig (mounting part)
8 Lid member 9 Telescopic device (mounting part)
9a One end in the radial direction of the steel pipe pile 2 in the expansion / contraction device 9 9b The other end in the radial direction of the steel pipe pile 2 in the expansion / contraction device 9 11 Weight 12 Vibro hammer 13 Rotating press machine 20 Outer shell steel pipe 21 Connecting cylinder 22 Bolt 32 Plate 41, 41A, 41B Rod connection part 42 Hydraulic hose 44, 44A, 44B Chuck 45 Chuck 51 Spacer 61 Anti-vibration rubber 62 Inner fixing plate 63 Outer fixing plate 64, 65 Fixing bolt 71 Overhanging piece 72 Drooping piece 73 Bolt 91 Holding part 92 Jack O Pile Axis T Intrusion structure of steel pipe pile G Ground Ga Soil and sand that entered the steel pipe pile 2 Gb Ground directly under the steel pipe pile 2 F Carriage

Claims (9)

A penetration resistance reducing device that is mounted on a steel pipe pile that penetrates into the ground by a pile driving device and reduces the penetration resistance of the steel pipe pile,
A vibrating rod;
A vibration exciter coupled so that the vibration rod extends downward;
A mounting portion for detachably mounting the vibrator on the steel pipe pile;
A vibration isolator interposed between the vibration exciter and the mounting portion;
With
The penetration resistance reducing device, wherein the vibration rod is inserted inside the steel pipe pile in a state where the vibration exciter is mounted on the steel pipe pile.   The penetration resistance reducing device according to claim 1, wherein the vibration exciter is disposed inside the steel pipe pile. The mounting portion is an attachment plate fixed to the inner surface of the steel pipe pile,
The penetration resistance reducing device according to claim 2, wherein the vibration exciter is detachably attached to the attachment plate via the vibration isolator.   2. The penetration resistance reducing device according to claim 1, wherein the mounting portion has an overhanging jig that protrudes laterally from the vibration isolation portion and is fitted on the upper portion of the steel pipe pile. .   One end of the mounting pipe in the radial direction of the steel pipe pile is fixed to the vibration exciter via the vibration isolating section, and the other end of the radial direction is provided with a gripping section and expands and contracts along the radial direction. The penetration resistance reducing device according to claim 2, wherein the penetration resistance reducing device is a device.   6. The penetration structure of a steel pipe pile, wherein the penetration resistance reducing device according to any one of claims 1 to 5 is mounted on an upper part of the steel pipe pile that penetrates the ground. The steel pipe pile has a shell steel pipe that can be coaxially connected to the upper end of the steel pipe pile to be penetrated,
The steel pipe pile penetration structure according to claim 6, wherein the vibration exciter is disposed inside the outer shell steel pipe.   The penetration structure of the steel pipe pile according to claim 6 or 7, wherein a lid member for closing the upper end opening of the steel pipe pile is provided. A steel pipe pile construction method using the steel pipe pile penetration structure according to any one of claims 6 to 8,
Attaching the vibration exciter to the steel pipe pile, and inserting the vibrating rod inside the steel pipe pile;
Driving the vibrator and vibrating the vibrating rod by the driving force;
For the steel pipe pile, the step of placing the steel pipe pile by applying impact, applying vibration, or rotating press-fitting,
A method for constructing a steel pipe pile characterized by comprising:

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