JPH1121890A - Tool for rotational press-in of steel pipe pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a screw part from being damaged by a rotating force in construction in the rotational press-in to the underground and facilitate the construction by providing a tool consisting of a lower end cylinder loosely fitted to the top part of a lower pile and an upper cylinder continued thereto, and fixing the lower end cylinder to the lower pile by a rotation preventive means. SOLUTION: The tool 1 are formed of an upper cylinder 2 and a lower cylinder 3 continued thereto, and the lower cylinder 3 is fitted into the bore of the head part of a steel pipe pile 100. This steel pile 100 has a female screw in the top part of a lower pipe and a cylindrical guide part having an inside diameter substantially equal to the inside diameter of the female screw in the lower end. The lower end cylinder 3 loosely fitted to the bore of the female screw and the cylindrical guide part is inserted to the pile head part without screwing with the female screw. Further, the lower end cylinder 3 has a locking hole 4, and a set bolt is screwed and fixed to a screw hole provided on the cylindrical guide part. Thus, the tool 1 for rotationally press fitting the steel pipe pile 100 having the female screw on the top part of the lower pipe is mounted and removed while preventing the damage of the female screw to perform an operation. Thus, construction of the steel pipe pile 100 can be facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique relating to a steel pipe pile in the field of civil engineering and construction, and more particularly to a yatco for rotary press-fitting a steel pipe pile.

[0002]

2. Description of the Related Art As a steel pipe pile to be rotationally press-fitted, a female thread is provided at the top of a lower pile, a male thread is provided at a lower end of an upper pile, and the upper and lower piles are joined by this screw.
For example, if there is a structure above the pile driving position and it is difficult to connect the upper pile to the lower pile without lowering the top of the lower pile into the ground, A temporary temporary stake that is added to the pile head at the time) is used. When it is necessary to temporarily remove the upper pile by lowering the head of the lower pile below the ground, the upper pile can be connected and rotated and pressed in, and the upper pile can be reversed and removed. At this time, a large rotational force is applied, so that when the upper pile is reversed and removed, it may be difficult to detach the threaded joint. Even in such a case, the pile is settled by using a yatco.

[0003] In these cases, it is necessary to provide a projection or the like at the top of the lower pile for engaging with the yoke. However, it is not easy to provide the projection or the like because of the threaded joint. It is extremely difficult to attach the projection. In addition, when inserting and constructing a yatco, there is a possibility that the thread portion of the joint may be damaged.

[0004]

It is an absolute requirement of such a yatco for rotary press-fitting of steel pipe piles that the female thread at the head of the lower pile is not damaged and that efficient construction is performed.
An object of the present invention is to provide a yacht coping with this requirement. In other words, the problem of the present invention is that when a pile having a female thread is rotationally press-fitted into the ground using a yatco, without damaging the screw portion due to rotational force during the construction, the construction can be easily performed, An object of the present invention is to provide a rotary press-fitting steel pipe pile capable of rotating and lifting a pile.

In such a case, in order to protect the female screw of the lower pile in particular, a separate adapter is attached to the head of the lower pile instead of the detent means for fixing the lower end cylinder to the lower pile. There is provided a yatco in which a lower end cylinder of the yatco is inserted into the adapter and locked with the adapter. Further, since the yatco is designed to withstand the rotational force, the weight increases, and handling becomes difficult under conditions where use of the crane is restricted. Therefore, for example, in the case of a yatco that copes with a case where a large rotational force is required with a large-diameter pile, a yatco is provided that is divided into blocks of a weight that can be handled manually and that are used by joining them.

[0006]

The present invention is characterized by taking the following technical means in order to solve the above problems. That is, the present invention relates to a yatco for rotationally press-fitting a steel pipe pile provided with a female screw on the top of a lower pile, the lower pile comprising a lower cylinder loosely fitted on the top of the lower pile and an upper cylinder connected to the lower cylinder, It is intended to provide a yatco for rotary press-fitting of a steel pipe pile, which is provided with a detent means for fixing the lower end cylinder to the pile. The lower end cylinder may be fitted inside or outside the top of the lower pile. In the case of the inner fitting, it is more preferable that the outer surface of the lower end cylinder of the Yatco is machine-finished, and a resin coating is provided on the outer surface to protect the female screw of the steel pipe pile.
The detent means is of a type capable of transmitting torque in both directions for rotating the pile forward and reverse around the axis and of a type that does not damage the threaded joint of the pile. For example, when a plurality of holes are provided in a wall of a lower end cylinder of a yatco, a screw hole facing the hole is provided in a pile head, and a means for inserting a set bolt into the screw hole is used, the pile and the yatco can be fixed to the right side of the pile. It is preferable because it can be appropriately restrained in the reverse rotation direction and the vertical direction, and does not damage the internal thread even if the lower cylinder is fitted inside.

In place of the detent means for fixing the lower end cylinder to the lower pile, a hollow cylindrical adapter which is loosely fitted in the top of the lower pile is attached, and this adapter has a detent which is fixed to the top of the lower pile. Means, and a projection for preventing vertical movement and forward / reverse rotation of the yatco is provided on the inner surface of the adapter, and a lower end cylinder engaged with the projection is connected to the upper cylinder, and the steel pipe pile is rotationally press-fitted. To provide Yatco.

[0008] The adapter is a hollow cylinder having an outer diameter that is loosely fitted to the inner diameter of the female screw at the upper end of the lower pile with a small gap, and is provided with detent means for transmitting the rotational force of the yatco to the pile. It is necessary to provide this detent means both between the lower end cylinder and the pile head and between the yatco. This detent means is of a type capable of transmitting torque in both directions for rotating the pile forward and reverse around the axis. As a detent means between the adapter and the pile head, for example, a set bolt inserted into a through-screw hole provided in a pile wall surface, a straight or tapered shear pin inserted into the hole, or the like can be used. The detent means between the adapter and the yatco may be of a type in which a projection projects from the inner surface of the adapter, and the projection and the projection provided on the outer surface of the yatco restrict the forward / reverse rotation direction and vertical movement of the pile. .

Next, in order to facilitate handling when the weight of the yatco is large, in the present invention, the upper cylinder is divided into a plurality of cylindrical members in a ring shape, and the divided cylindrical members are fitted around each other. It has an axial binding bolt that binds the whole divided cylinder that is joined by unevenness, and is used by binding. If the divided cylindrical member is divided so that the weight of one is less than 50 kg, it can be handled manually and can be used even when a crane or the like cannot be used freely in a narrow place. In addition, since the divided members are joined by the circumferential fitting concave and convex, alignment can be easily performed, and further, it can be used for forward / reverse rotation.

[0010] The yatco may have a shape in which the lower end cylinder is directly prevented from rotating around the pile head, or may be a type in which an adapter is attached to the pile head and the lower end cylinder is locked inside the adapter.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present applicant has been studying a steel pipe pile to be press-fitted by rotation, and has developed a multi-helix straight threaded joint having a guide portion. This threaded joint is composed of a male screw and a female screw that are screwed to each other and provided at the end of a steel pipe pile, and a cylindrical portion provided with a screw bottom diameter of the external thread at the tip of the male screw and an axial perpendicular surface at the tip is provided. A joint joint for steel pipe piles, in which an inner cylindrical portion having an inner diameter of an internal thread is provided at the back of the lower end, and the inner cylindrical portion guides the cylindrical portion of the male screw side joint so as to be smoothly connected. This threaded joint enables accurate and quick alignment of the upper and lower piles, easy joining, reliable and high reliability,
Excellent on-site workability. And usually, the upper pile is provided with a female screw at the upper end of the lower pile, and the upper pile is screwed and connected, and the rotary press-fit,
It is designed to be propelled underground by the underground mining method, earth auger method, etc. The present invention can be used not only for such a steel pipe pile, but especially when applied to the construction of such a steel pipe pile under conditions that require the use of a yatco, the protection of a female screw having high workability can be perfectly ensured. Therefore, the merit is great.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a yatco 1 according to an embodiment of the present invention, and FIG. 2 is a partial cross-sectional view showing a state where the yatco 1 is engaged with a head of a steel pipe pile 100. The yatco 1 is formed by connecting an upper cylinder 2 and a lower cylinder 3 in series, and the lower cylinder 3 is fitted to the inner diameter of the head of the steel pipe pile 100. The yatco 1 has a hanger 5 at the upper end. In this embodiment, as shown in FIG.
0 is provided with a female screw 101 at the top, and a steel pipe pile 100 provided at its lower end with a cylindrical guide 103 having an inner diameter substantially equal to the inner diameter of the female screw 101. In such a steel pipe pile 100, it is possible to use a yatco 1 provided with a male screw that is screwed into the female screw 101,
When the male screw of the yatco 1 is screwed into the female screw 101 and the steel pipe pile 100 is rotationally press-fitted, when the yatco 1 is reversed and pulled out from the steel pipe pile 100, the screw may be tightened and the pulling out may be difficult. Then, the lower end cylinder 3 which is loosely fitted to the inner diameter of the female screw 101 and the cylindrical guide portion 103 without being screwed with the female screw 101 is inserted into the pile head, and the lower end cylinder 3 is provided with the locking hole 4, and the cylindrical shape is formed. The set bolt 105 was screwed into a screw hole provided in the guide portion 103 and fixed. The lower end cylinder 3 is provided with, for example, a resin coating 6 as a protective film on the outer peripheral surface, and
Can also be protected. Since the upper cylinder 2 does not need to be fitted into such a female screw portion or to protect the female screw 101 of the steel pipe pile 100, a protective film or the like is not required.

The lower end 3 of the lower cylinder 3 abuts on a step 102 provided on the inner surface of the steel pipe pile 100, or the lower end 8 of the upper cylinder abuts on the upper end of the steel pipe pile 100,
A downward thrust is given to the steel pipe pile. FIG. 3 shows a side view of the yatco 1 used under conditions where the weight is large and it is difficult to use a crane or the like. A plurality of cylindrical members 21, 22, 23 are formed by cutting the upper cylinder 2 into a ring shape.
As shown in an exploded view in FIG. 4, the divided cylindrical members 21, 22, 23, etc. are joined together by providing circumferentially fitting concave / convex portions 24, 25, 26, 27 which mesh with each other. A plurality of axial binding bolts 40 for binding the divided cylindrical members 21, 22, 23 as a whole and the lower cylinder 3 are provided and used by binding. Individual cylindrical members 21 and 22 divided,
When 23 or the like is divided so that the weight of one of them is within 50 kg, it can be handled manually and can be used even when a crane or the like cannot be used freely in a narrow place. Further, the cylindrical member 21 divided into a slice shape,
22 and 23 and the lower cylinder 3 etc.
5, 26, 27, 33, 34, so that the members can be easily aligned,
Further, the rotational torque can be transmitted in both forward and reverse directions.

The cylindrical members 21, 22, 23, the lower cylinder 3 and the like are bound by an axial binding bolt 40 for binding the entire cylinder. 5 is a plan view of FIG. 4, and FIG. 6 is a side view of the binding bolt 40. The divided cylindrical member 21 and the like are provided with a bracket 28 protruding inside, and a hole or a screw hole 29 for inserting a binding bolt 40 into the bracket. The binding bolt 4 passes through these holes or screw holes.
0 is inserted and the cylindrical members 21, 22, 23 and the like are assembled and used. The binding bolt 40 has a tapered guide 41 and a screw 42 at the lower end, and a head 43 and a suspension ring 44 at the upper end. Therefore, even under conditions in which a crane or the like cannot be used freely, construction with a yatco can be easily performed.

FIGS. 7 to 9 show the YATCO 1.
As shown in FIG.
A hollow cylindrical adapter 50 that fits into the inner diameter of the adapter 1 is attached, and is configured to be locked to the adapter 50, so that the female screw can be protected. FIG. 7 shows a steel pipe pile 100.
8 is a partial cross-sectional view showing a state in which the head 1 is mounted with the yacht 1 via an adapter 50, FIG. 8 is an overall view thereof, and FIG. 9 is a plan view of the adapter 50. The adapter 50 is a cylindrical body that fits loosely on the inner diameter of the top of the steel pipe pile 100, and its outer surface can be coated with a resin film 51 as a protective film for protecting the female screw. It is provided with a detent means for transmitting the rotational force to the pile and a means for restricting the vertical movement of the yatco 1.

As means for preventing rotation between the adapter 50 and the head of the steel pipe pile 100, for example, a hole 5 is formed in the adapter 50.
2 is provided, and is fixed by a set bolt 105 inserted into a through screw hole provided on the wall surface of the steel pipe pile 100. As an engagement means between the adapter 50 and the yatco 1, projections 53 and 54 project from the inner surface of the adapter 50,
The projections 53 and 54 and the projection 32 provided on the outer surface of the lower cylinder 3 of the yatco 1 may be of a type that restricts the forward and reverse rotation directions and the vertical direction of the pile. At this time, as illustrated in FIGS. 3 and 4, the lower cylinder 3 of the yatco 1 includes a plurality of axially long rectangular rod-shaped projections 32 protruding from the outer peripheral surface 31, and the projections 53 and 54 on the adapter 50 side are As shown in FIGS. 7 to 9, a projection 54 for limiting the forward / reverse rotation direction and a circumferential intermittent projection 53 for limiting the vertical movement are provided.
The protrusion 32 on the outer peripheral surface of the lower cylinder is inserted in the longitudinal direction of the steel pipe pile 100 through the space between the protrusions 53, and then rotates forward or backward to engage so as to limit the rotational direction and the vertical movement. It is preferable to use a format.
Note that the downward thrust of the yatco 1 is applied to the lower surface 61 of the upper cylinder 2.
And the upper surface of the adapter 50 abuts on the adapter 50.

[0017]

According to the present invention, in a yatco for rotationally press-fitting a steel pipe pile provided with a female thread on the top of a lower pile, the yatco can be attached and detached and operated without damaging the female thread. Construction of steel pipe piles under conditions that required the use of steel pipes became easier. In addition, when it is difficult to use a crane or the like, a heavy yatco can be assembled manually.

[Brief description of the drawings]

FIG. 1 is a perspective view of a yatco of an embodiment.

FIG. 2 is a partial vertical cross-sectional view of a pile head to which the yachts of the embodiment are mounted.

FIG. 3 is a side view of the yacht-copper of the embodiment divided into a ring-shape.

FIG. 4 is an exploded view of a yacht-copper of the embodiment divided into a ring shape.

FIG. 5 is a plan view of the yacht-copper of the embodiment divided into a ring-shape.

FIG. 6 is a side view of the binding bolt.

FIG. 7 is a partial longitudinal sectional view of a pile head to which a yatco of another embodiment is mounted.

FIG. 8 is a longitudinal sectional view of a pile head to which a yacht of another embodiment is mounted.

FIG. 9 is a plan view of the adapter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Yatco 2 Upper cylinder 3 Lower cylinder 4 Locking hole 5 Hanging tool 6 Resin coating 7 Lowest end face 8 Lower end 21, 22, 23 Cylindrical member 24, 25, 26, 27, 33, 34 Irregularity 28 Bracket 29 Hole or screw hole Reference Signs List 31 outer peripheral surface 32 projection 40 binding bolt 41 tapered guide portion 42 screw 43 head 44 hanging ring 50 adapter 51 resin coating 52 hole 53, 54 projection 100 steel pipe pile 101 female screw 102 step 103 cylindrical guide section 105 set bolt 110 lower pile

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Masanori Shimizu 1-1-1, Kawasaki-cho, Handa-shi, Aichi Prefecture Inside the Chita Works of Kawasaki Steel Works (72) Inventor Koichi Okita 1-1-1-1, Kawasaki-cho, Handa-shi, Aichi Prefecture Kawasaki Inside the Chita Works of Iron and Steel Corporation

Claims (3)

[Claims] 1. A yatco for rotationally press-fitting a steel pipe pile provided with a female thread on the top of a lower pile, comprising a lower cylinder loosely fitted on the top of the lower pile, and an upper cylinder connected to the lower cylinder.
A yatco for rotationally press-fitting a steel pipe pile, comprising a detent means for fixing the lower end cylinder to the lower end. 2. A non-rotating means for fixing the lower end cylinder to the lower pile, a hollow cylindrical adapter which is loosely fitted in the top of the lower pile, and which is fixed to the top of the lower pile. 2. A steel pipe according to claim 1, wherein means are provided, and a projection for preventing vertical movement and forward / reverse rotation of the yacht is provided on an inner surface thereof, and a lower end cylinder engaged with the projection is connected to the upper cylinder. Yatco for rotary press-fitting of piles. 3. The method according to claim 1, wherein the upper cylinder is divided into a plurality of cylindrical members in a ring-shape, and the cylindrical members are joined by circumferential fitting concave and convex meshing with each other, and are provided with axial binding bolts for binding the entire divided cylinder. 3. The method according to claim 1, wherein
Yatko for rotary press-fitting of the steel pipe pile described.