JP3749868B2 - Steel pipe pile construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction method for pouring the steel pipe pile in the ground in order to build the foundation pile structures, steel pipe pile設工method at low spatial especially working space height is limited to less about the.
[0002]
[Prior art]
Conventionally, there is a construction method disclosed in Japanese Patent No. 2519851 as a construction method that is convenient for placing a steel pipe pile in a low space where the working space height is limited to be low. This is because the steel pipe pile with the liquid feeding pipe inserted and deployed is pushed into the ground while rotating with a rotary press machine installed on the ground. Connect the next steel pipe pile and the liquid feeding pipe to the pipe, respectively, repeat the press-in drilling to reach the specified ground, and then separate and collect the liquid feeding pipe from the liquid pipe of the first steel pipe pile. It is a method to do.
[0003]
[Problems to be solved by the invention]
According to the above construction method, the steel pipe pile is made to reach the predetermined ground while sequentially adding the liquid pipe together with the liquid pipe, and then the liquid pipe is separated from the liquid pipe of the first steel pipe pile and collected, This also takes a lot of labor and time, and because a stationary rotary press installed on the ground is used to rotationally press the steel pipe pile into the ground, the place where the steel pipe pile is placed is moved. It takes a lot of time and effort to move and install the rotary press machine when doing so, and the construction efficiency of foundation piles is reduced.
[0004]
The present invention aims to provide a high efficiency allows construction method for building construction of foundation piles by steel pipe pile has been inserted deploying liquid transfer pipe.
[0005]
[Means for Solving the Problems]
In the steel pipe pile driving method according to the first aspect of the invention, the excavation head 6 is provided at the lower end of the first steel pipe pile 5 among the plurality of steel pipe piles 5 constituting the foundation pile P, and the support member is provided inside the steel pipe pile 5. 10 is provided with a liquid feed pipe 7 that is concentrically supported by the steel pipe pile 5 and the steel pipe pile rotation in which the leading steel pipe pile 5 is supported by the leader 1 supported by the self-propelled pile driver 2 so as to be movable up and down. When the drilling liquid a is injected from the liquid feed pipe 7 while being rotated by the press-fitting device 3, it is pressed into the ground, and if it is pressed to an arbitrary position, the next is the liquid feed pipe 7 in the first steel pipe pile 5. The liquid feed pipe 7 is connected by screwing and the next steel pipe pile 5 is connected to the first steel pipe pile 5 by welding, and then the above operation is repeated. The liquid feed pipe 7 is connected to the steel pipe pile 5 and the excavation head. 6 and is buried in the ground together.
[0006]
A second aspect of the present invention is the steel pipe pile placing method according to the first aspect, wherein the excavation head 6 is attached by welding at appropriate intervals in the radial direction via a mounting base 6a that traverses the steel pipe pile in the radial direction. The liquid feed pipe 7 is made of a steel pipe pile 5 so that the nozzle 8 at the lower end of the excavated blade 6b is cut into the hollowed portion 6c of the central portion of the excavated blade 6b. The nozzle 8 is inserted along the axis, and is bent downward by the hydraulic pressure or the like to open the nozzle 8 and release the drilling fluid or the like. Normally, the nozzle 8 is released by the external pressure and its elasticity. A valve 8a made of a rubber plate for closing is attached.
[0007]
Claim 3 is the steel pipe pile placing method according to claim 1 or 2, wherein after the steel pipe pile 5 is made to reach a predetermined depth, the excavation liquid a is switched to a hardening material b such as cement milk, and the liquid feed pipe 7 It is further characterized in that it is injected and mixed with the excavated soil to solidify the tip portion of the earliest steel pipe pile 5.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a side view showing the entire steel pipe pile driving apparatus according to the present invention, and FIG. 2 is an enlarged longitudinal sectional view of a steel pipe pile rotary press-fitting apparatus in this steel pipe pile driving apparatus. In FIG. 1, reference numeral 1 denotes a leader vertically supported by a crawler type self-propelled pile driver 2 through a support stay 11 and a support hole arm 14, and a steel pipe pile rotary press-fitting device 3 guides the leader 1. The rail 4 and the guide arm 25 fitted to the rail 4 are supported to be movable up and down. 5 is a steel pipe pile which comprises a foundation pile.
[0010]
As shown in FIG. 3, an excavation head 6 for burying is attached to the tip of the steel pipe pile 5. The excavation head 6 includes a large number of excavation blades 6b attached by welding at appropriate intervals in the radial direction via mounting bases 6a that traverse the steel pipe pile 5 in the radial direction. The liquid feed pipe 7 is inserted along the axial center of the steel pipe pile 5 so that the nozzle 8 at the lower end of the part 6c of the part where the excavating blade 6b is located is placed, and the nozzle 8 is As shown in the figure, the nozzle 8 is opened by bending downward by hydraulic pressure or the like, and the drilling fluid or the like is discharged in the direction of the arrow as will be described later. Normally, the nozzle 8 is closed by the external pressure. The valve 8a is attached. According to the digging head 6 for burying, the steel pipe pile 5 is attached in the radial direction, and is attached to the outer peripheral surface of the steel pipe pile 5 so as to protrude to the outside by a slight amount L as shown in the figure, and In order to perform excavation work while discharging excavation liquid from the liquid feed pipe 7 located above the excavation blade 6b located at the center of the excavation blade 6b attached in the radial direction through the nozzle 8, the steel pipe pile It is possible to reliably excavate the underground prior to 5 and embed the steel pipe pile 5 efficiently.
[0011]
Moreover, the upper end part of this liquid feeding pipe 7 protrudes from the upper end of the steel pipe pile 5, as shown in FIG. 2, and the swivel device 9 is attached to the protruding end part. Although detailed illustration is omitted, the swivel device 9 supplies a drilling fluid such as water or a hardening material such as cement milk to a liquid feeding pipe 7 that rotates integrally with the steel pipe pile 5 when the steel pipe pile 5 is placed. It is supported by the reader 1 side and is detachable from the upper end portion of the liquid feeding pipe 7. Further, the liquid feeding pipe 7 inserted into the earliest steel pipe pile 5 is supported concentrically with the steel pipe pile 5 by radially extending rod-like support members 10 attached in the upper end portion of the steel pipe pile 5. .
[0012]
As shown in FIGS. 1 and 2, the steel pipe pile rotary press-fitting device 3 is suspended from a pair of left and right hydraulic cylinder units 12 for lifting and lowering in which a piston rod 12 a is attached to an arm 26 provided at the upper end of the reader 1. It is comprised from the raising / lowering body 13 supported, and the rotary press-fit apparatus main body 15 attached to this raising / lowering body 13 in a pair. The rotary press-fitting device main body 15 includes a steel pipe pile rotation drive ring 16 supported so as to be rotatable only around a vertical axis, a pair of left and right rotation drive units 17 that rotationally drive the ring 16, and a bottom of the ring 16. A steel pipe pile chuck 18 connected to the side is provided.
[0013]
The steel pipe pile chuck 18 is fitted with a plurality of wedge-shaped chuck pieces 20 connected to the positions of the steel pipe pile rotation driving ring 16 at equal intervals in the circumferential direction via links 19, respectively. A lifting ring 22 that supports the ring-shaped cam 21 that can rotate only at a position concentric with the ring 16, a plurality of circumferential lifting guides 23 that guide the lifting ring 22 so that it can only move up and down, and drive the lifting ring 22 up and down. It comprises a plurality of cylinder units 24 in the circumferential direction.
[0014]
Therefore, by pulling up the lifting ring 22 by each cylinder unit 24, each chuck piece 20 is moved closer to the rotation axis of the steel pipe pile driving ring 16 by the ring-shaped cam 21 that rises integrally with the lifting ring 22. The outer peripheral surface of the steel pipe pile 5 penetrating through the ring 16 can be clamped in a self-aligning manner. On the other hand, when the steel pipe pile rotation drive ring 16 rotates, the link 19, the chuck piece 20 and the ring-shaped cam 21 rotate together, so that the steel pipe pile rotation drive ring 16 is connected to the rotation drive unit 17 (FIG. 1). If rotationally driven, the steel pipe pile 5 clamped by the steel pipe pile chuck 18 can be integrally rotated.
[0015]
The steel pipe pile placing method of the present invention performed using the steel pipe pile placing apparatus configured as described above will be described with reference to FIGS. 1 and 2 as appropriate with reference to FIGS.
[0016]
First, as shown in (1) in FIG. 4, the first steel pipe pile 5 placed on the ground is lifted and fitted into the steel pipe pile rotary press-fitting device 3. The self-propelled crane uses the suspension rope to lift the steel pipe pile 5 directly above the steel pipe pile rotary press-in device 3 as shown in the phantom line of FIG. The pile 5 is lowered, passed through the steel pipe pile driving ring 16 and the steel pipe pile chuck 18, and built vertically on the ground by its own weight.
[0017]
Next, the steel pipe pile 5 is press-fitted into the ground using the steel pipe pile press-fitting device 3, and the method is performed as follows. In other words, the cylinder unit 12 for raising and lowering the steel pipe pile rotary press-fitting device 3 is operated to raise the rotary press-fitting device 3 by an appropriate distance, and then the steel pipe pile chuck 18 is operated to turn the steel pipe pile 5 into the rotary press-fitting device main body 15. The rotary press-fitting device main body 15 is pushed down with respect to the lifting body 13 by the lifting cylinder unit 12 in the clamped state. The rotary press-fitting device body 15 is forcibly pushed down integrally with the steel pipe pile 5 by the action of the lifting cylinder unit 12. On the other hand, the steel pipe pile 5 clamped by each chuck piece 20 of the steel pipe pile chuck 18 is rotated with the steel pipe pile rotation drive ring 16 by operating the rotary drive unit 17 to rotationally drive the steel pipe pile rotary drive ring 16. Rotate around a vertical axis as a unit.
[0018]
As described above, the steel pipe pile 5 is pressed into the ground while being pressed while being rotated by the steel pipe pile rotary press-fitting device 3. During the rotary press-in digging of the steel pipe pile 5, the drilling fluid a is supplied from the hose 27 to the liquid feeding pipe 7 in the steel pipe pile 5 through the swivel device 9, and the nozzle attached to the lower end portion of the earliest steel pipe pile 5 The rubber valve 8a is opened from 8 and injected into the excavated ground. In this way, the first steel pipe pile 5 is pressed and dug to an arbitrary position while injecting the drilling liquid from the lower end of the liquid feeding pipe 7 while rotating the steel pipe pile rotary press-fitting device 3. The state where the pressure digging up to an arbitrary position is shown in (2) of FIG.
[0019]
When the press-in digging to an arbitrary position, as shown in (3) in FIG. 4, the next liquid feeding pipe 7 is connected to the first liquid feeding pipe 7 in the steel pipe pile 5 in the ground by screwing. To do. Shows the screwed portion of the liquid feed pipe 7 W _7. After the liquid feeding pipe 7 is added in this way, the next steel pipe pile 5 is connected to the earliest steel pipe pile 5 in the ground by welding as shown in (4) in FIG. Shows the weld of the steel pipe pile 5 W _5. At this time, the steel pipe pile 5 to be connected is carried out by a suspension rope that is wound and unwound by a winch of a self-propelled crane (not shown), similarly to the above-described suspension operation of the first steel pipe pile 5. When the liquid feeding pipe 7 is added, the swivel device 9 is detached from the liquid feeding pipe 7 in the first steel pipe pile 5 and attached to the upper end of the upper liquid feeding pipe 7 which is added by screwing ((3 in FIG. 4). ▼).
[0020]
In this way, after the next steel pipe pile 5 and the liquid feeding pipe 7 are added to the first steel pipe pile 5 and the liquid feeding pipe 7 by welding and screwing, respectively, the added upper steel pipe pile 5 is rotated in the same manner as described above. While being rotated by the press-fitting device 3, further press-fitting is made to an arbitrary position while injecting the drilling liquid from the lower end of the liquid feed pipe 7. This state is shown in (1) of FIG. Then, as shown in (2) of FIG. 5, the next liquid feeding pipe 7 is further screwed to the liquid feeding pipe 7 in the steel pipe pile 5 in the ground, and after the liquid feeding pipe 7 is added, As shown in (3) in the figure, the following steel pipe pile 5 is further connected to the steel pipe pile 5 in the ground by welding.
[0021]
The above operation is repeated a required number of times, and as shown in (1) in FIG. 6, the earliest steel pipe pile 5 has a predetermined depth, that is, a predetermined position on the near side of the support layer K shown in (2) in FIG. Is reached, the drilling fluid a that has been supplied to the liquid feeding pipe 7 is switched to the supply of the hardened material b such as cement milk, and the hardened material b is transferred from the hose 36 to the steel pipe pile 5 through the swivel device 9. It supplies to the liquid feeding pipe 7, and inject | pours and discharges the hardening material b from the front-end | tip nozzle 8 of the earliest steel pipe pile 5 during the rotation press injection of the steel pipe pile 5, and mixes and stirs with excavated soil. If the earliest steel pipe pile 5 enters the support layer K as shown in (2) of FIG. 6, it is embedded over a predetermined length (L) from the front side of the support layer K to the support layer K. The leading end solidified portion 28 of the foremost steel pipe pile 5 is formed. When the solidified portion 28 of the hardened material b is cured in this way, a solid foundation pile P, which is composed of the required number of steel pipe piles 5 and whose tip portion is rooted and fixed to the support layer K, is formed. In this case, the hardened material b such as cement milk entangles with the mounting base 6a attached in the radial direction of the excavation head 6 to support the steel pipe pile 5 more firmly during the rooting portion 28.
[0022]
After the foundation pile P is formed, the swivel device 9 attached to the uppermost liquid feeding pipe 7 is removed, and this liquid feeding pipe 7 cuts the portion protruding from the uppermost steel pipe pile 5 at most. The steel pipe pile 5 is left in the ground as it is. And when forming a new foundation pile P in another location, the self-propelled pile driver 2 is moved to the predetermined position, and a series of operations similar to those described in FIGS. 4 to 6 are performed. You can do it.
[0023]
According to the embodiment described above, the earliest steel pipe pile 5 equipped with the liquid feeding pipe 7 is supported by the leader 1 supported by the crawler-type self-propelled pile driver 2 so as to be movable up and down. Since the steel pipe pile rotary press-fitting device 3 rotates and press-fits into the ground, the moving work of the rotary press-fitting machine is performed as in the case of using a stationary rotary presser when moving the place where the steel pipe pile 5 is placed. And the installation work does not take much time and effort, and by moving the leader 1 by the self-propelled pile driver 2, the steel pipe pile rotary press-fitting device 3 can be easily moved and positioned. Thus, the construction efficiency of the foundation pile P can be improved.
[0024]
Unlike the conventional method in which a steel pipe pile is made to reach a predetermined ground while being joined together with a liquid feeding pipe, and then separated from the liquid feeding pipe of the first steel pipe pile, the method of the present invention is different from the conventional method. 7 and the excavation head 6 are finally buried in the ground together with the steel pipe pile, so that the work of separating and collecting the liquid feeding pipe becomes unnecessary, and the liquid feeding pipe acts as a kind of reinforcing bar, and the foundation pile P The construction efficiency of construction can be further improved. Furthermore, in the present invention, the steel pipe pile 5 and the liquid feeding pipe 7 are connected to each other, the heavy steel pipe piles 5 are welded together, and the light-weight liquid feeding pipe 7 is screwed by the operator. Since they are connected to each other, the on-site connection work can be performed efficiently, and the construction work efficiency of the foundation pile P can be further improved in terms of the connection work.
[0025]
In the above-described embodiment, the self-propelled crawler pile driver 2 is used, but a wheel-type self-propelled pile driver may be used.
[0026]
【The invention's effect】
According to the steel pipe pile driving method of the invention according to claim 1, the excavation head is provided at the lower end of the first steel pipe pile among the plurality of steel pipe piles constituting the foundation pile, and the liquid feed pipe is provided inside the steel pipe pile. Since this earliest steel pipe pile is rotated by a steel pipe pile rotary press-fitting device supported by a leader supported by a self-propelled pile driving machine, it is pressed into the ground and moved. When using a stationary rotary presser, it is not necessary to move and install the rotary presser, and the leader is moved by a self-propelled pile driver so that The apparatus can be moved and positioned easily and easily, thereby improving the construction efficiency of foundation piles.
[0027]
Unlike the conventional method in which a steel pipe pile is made to reach a predetermined ground while being joined together with a liquid feeding pipe, and then the liquid feeding pipe is separated from the liquid feeding pipe of the earliest steel pipe pile and collected, this invention is finally fed. Since the liquid pipe and the excavation head are buried in the ground together with the steel pipe pile, the work of separating and collecting the liquid supply pipe becomes unnecessary, and the liquid supply pipe acts as a kind of reinforcing bar, and the excavation head is made of a hardened material. When solidifying, the hardened material can be entangled integrally with each other to further increase the supporting force, and the construction efficiency of foundation piles can be further improved. Moreover, in this invention, in order to connect a steel pipe pile and a liquid feeding pipe, respectively, heavy steel pipe piles are welded, and a lightweight liquid feeding pipe is screwed by an operator. Therefore, the connection work at the site can be efficiently performed, and the construction work efficiency of the foundation pile can be further improved from the viewpoint of the connection work.
[0028]
According to the invention which concerns on Claim 2, according to the said excavation head, it is attached to the state which protrudes from the outer peripheral surface of this steel pipe pile slightly while being attached over the whole radial direction of a steel pipe pile, and radial direction In order to perform excavation work while discharging the drilling fluid through the nozzle from the liquid feed pipe located above the drilling blade located in the center of the drilling blade attached to the pipe, The steel pipe pile can be buried efficiently, and the hardened material such as cement milk is entangled with the mounting base attached in the radial direction of the drilling head. The steel pipe pile will be supported more firmly.
[0029]
According to the invention which concerns on Claim 3, after making a steel pipe pile reach | attain to predetermined depth with a liquid feeding pipe, it switches excavation liquid to hardening materials, such as cement milk, and injects from a liquid feeding pipe, Since the tip portion is solidified, it is possible to form a solid foundation pile composed of a required number of steel pipe piles, the tip portion of which is solidified by the support layer and fixed.
[Brief description of the drawings]
FIG. 1 is a side view showing the whole of a steel pipe pile driving apparatus according to the present invention.
FIG. 2 is an enlarged vertical sectional view of a steel pipe pile rotary press-fitting device in a steel pipe pile driving device.
FIG. 3 is a partially longitudinal front view showing a buried excavating blade used in the present invention.
[Fig. 4] (1) to (4) are explanatory diagrams for explaining the first stage of the steel pipe pile placing method according to the present invention.
FIGS. 5A to 5C are explanatory views for explaining the next stage.
FIGS. 6A and 6B are explanatory diagrams for explaining the final stage.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Leader 2 Self-propelled pile driving machine 3 Steel pipe pile rotary press-fitting device 5 Steel pipe pile 6 Drilling head 7 Liquid feed pipe 8 Nozzle 9 Swivel device 12 Lifting cylinder unit 13 Lifting body 15 of the steel pipe pile rotary press-fitting device 15 Rotational press-fitting device body 16 Steel pipe pile rotation ring 17 Rotation drive unit 18 Steel pipe pile chuck

Claims (3)

A drilling head is provided at the lower end of the first steel pipe pile among the plurality of steel pipe piles constituting the foundation pile, and a liquid feed pipe supported concentrically with the steel pipe pile by a support member is provided inside the steel pipe pile. The steel pipe pile is rotated by a steel pipe pile rotary press-fitting device supported by a leader supported by a self-propelled pile driver so that the drilling liquid is injected from the liquid feeding pipe while being pushed into the ground. After the press-in digging to the position, after connecting the next liquid pipe to the liquid pipe in the first steel pipe pile by screwing and connecting the next steel pipe pile to the first steel pipe pile by welding, The pipe pile driving method is characterized in that the operation of the above is repeated and the liquid feed pipe is buried in the ground together with the steel pipe pile and the excavation head.   The excavation head is composed of a large number of excavation blades attached by welding at appropriate intervals in the radial direction via a mounting base that traverses the steel pipe pile in the radial direction, and the position of the excavation blade at the center of the excavation blades The liquid feeding pipe is inserted along the axis of the steel pipe pile so that the lower end nozzle comes to the hollowed portion of the portion to be cut, and the nozzle is bent downward by hydraulic pressure etc. The steel pipe pile driving method according to claim 1, wherein a valve made of a rubber plate that closes the nozzle by an external pressure and its elasticity is attached at all times, although it is opened to discharge drilling fluid and the like.   After the steel pipe pile has reached the specified depth, the drilling fluid is switched to a hardener such as cement milk, injected from the liquid feed pipe, mixed with the excavated soil, and solidified at the tip of the first steel pipe pile. The steel pipe pile driving method according to claim 1 or 2, characterized in that:

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