JP3042154U - Steel pipe pile fittings - Google Patents

Abstract

(57) [Abstract] [Problem] When sinking a pile into the ground, when the pile head is lower than the operating range of the pile construction device, it is necessary to construct with a yatco, but the yatco is easily piled. Provided is a steel pipe pile joint that can be engaged with a head. SOLUTION: The internal thread includes an internal thread, an inner guide cylinder that is adjacent to the lower side of the internal thread and that guides the outer circumference of the lower end cylinder of the upper pile, and a plurality of protrusions that project inward from the lower end of the inner guide cylinder. A joint for a steel pipe pile, which has an outer diameter loosely fitted to the inner diameter of an internal thread and is formed so as to engage with a yatco that rotates the pile around an axis.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention is a technology relating to steel pipe piles in the field of civil engineering and construction, and uses, for example, Yatco (employed piles, auxiliary temporary piles that are added to piles above piles when sinking pile heads). Steel pipe pile joints.

[0002]

[Prior art]

 Generally, piles are those that penetrate into the ground by impact or impact, those that enter underground by press-fitting or vibration, those that sink by an internal moat, those that are propelled by rotation, or those that are drilled by earth augers, etc. There are various things to insert.

Further, there are concrete piles, steel pipe piles, etc. as the piles, and there are steel pipe piles having a diameter of, for example, about 200 to 600 mm and a length of several tens of meters depending on the conditions of the construction site. It has excellent characteristics such as high strength and easy connection. Such steel pipe piles are easy to connect and use at the construction site. Conventionally, butt welded joints, welded joints using sleeves, screw joints, flange joints, etc. have generally been used for joints of steel pipe piles. Welded joints have problems that it takes a long time for welding work, it is becoming difficult to secure skilled welding workers, and X-ray inspection is required. Tapered screws are not easy to align the upper and lower piles, require precise and careful setting of the upper and lower piles, and are prone to poor construction. The flange joint has a problem that the outer diameter becomes large.

The applicant has developed a multi-threaded threaded joint having a guide portion, in which these drawbacks are remedied. This joint consists of male and female threads that are screwed together at the end of the steel pipe pile and are multi-threaded threads with three or more parallel threads, with the bottom of the male thread as the outer diameter and the shaft at the tip. A cylindrical guide with a right-angled surface is provided, an outer peripheral seat that is larger than the outer diameter of the male thread is provided at the rear end of the male thread, and an inner peripheral seat that closely contacts the axis-perpendicular surface is provided on the female screw side. Is a joint joint for steel pipe piles, in which a seal portion is formed between the outer peripheral seat and a waterproof rubber ring. This joint enables quick and accurate centering of the upper and lower piles, and has excellent workability in the field.

[0005]

[Problems to be solved by the device]

 When sinking a pile into the ground, when the pile head falls below the operating range of the pile construction equipment, it is necessary to construct it using Yatco. An object of the present invention is to provide a steel pipe pile joint in which this yatco can be easily engaged with the pile head. In particular, the present invention provides a particularly suitable steel pipe pile joint when the pile using the above-mentioned multi-thread screw joint is rotationally sinked into the ground and the pile is constructed using Yatco.

[0006]

[Means for Solving the Problems]

 The present invention was developed to solve the above-mentioned problems, and includes an internal thread that is screwed to the external thread at the lower end of the upper pile, and an inner guide cylinder that is adjacent to the internal thread and that guides the outer circumference of the lower end cylinder of the upper pile. Provided is a joint for a steel pipe pile, comprising: a plurality of projections that engage with a yatco that rotates the pile around an axis and that are provided at the lower end of an inner surface guiding cylinder so as to project inward. This joint is attached to the upper end of the lower pile.

The YATCO includes a cylindrical body having an outer diameter that loosely fits into the inner diameter of the female screw, and a hook-shaped notch that engages with the protrusion is provided at the lower end of the cylindrical body so that it can be easily mounted on a pile head. You should be able to do so. Further, it is preferable that the yatco and the protrusion have engaging portions in both directions for rotating the pile forward or backward about the axis so that it can be used for both sinking and pulling up the pile.

[0008]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partial vertical sectional view of a joint of a steel pipe pile according to an embodiment of the present invention, and FIG. 2 is a horizontal sectional view. The joint 20 is attached to the upper end of the steel pipe pile 110. An internal thread 21 is provided on the inner periphery of the internal thread 21, and a guide inner cylindrical surface 22 is provided below the internal thread 21. The internal thread 21 is a parallel thread which is a multiple thread and has no taper. The male thread 11 and the female thread 21 are formed as parallel threads having no taper as described above, and are multi-thread threads having three or more threads. Parallel threads can be joined with lower torque than taper threads. Also, in the case of a multi-thread screw, the lead in the axial direction when it makes one rotation is a multiple number of times the thread pitch. Therefore, quick screwing is possible.

The inner guide tube 20 has a cylindrical shape that matches the inner diameter of the female screw 21. FIG. 4 shows a vertical cross-sectional view when this joint is connected to the joint 10 of the upper pile. The joint 10 at the lower end of the upper pile 100 includes a male screw 11 and a guide outer cylindrical surface 12 below the male screw 11, and is screwed to the joint 20 at the upper end of the lower pile. When connecting this joint, if the upper pile is lowered almost above the lower pile, the guide outer cylindrical surface 12 is inserted into the female screw 21 and the guide inner cylindrical surface 22, and the centers are automatically aligned. , The male screw and the female screw will be engaged. Then, the upper and lower piles can be easily joined by screwing the screws 11 and 21 while turning the upper pile.

Then, the set bolt 30 is screwed into the set bolt screw hole 23 provided in the joint 20 of the lower pile of the steel pipe pile so that the upper and lower piles do not come out even when the upper pile is reversed. It is set by being locked in the concave portion 13 provided in. The joint 20 at the upper end of the lower pile of the steel pipe pile has a protrusion 24 projecting inward from the lower end of the guide inner cylindrical surface 22. A plurality of the protrusions 24 are provided on the circumference, and FIG. 2 is an example thereof. FIG. 3 shows an example of the Yatco 40. The yatco 40 has a cylindrical shape, and the outer periphery thereof is provided with a cylindrical surface 44 that is loosely fitted in the inner diameter of the joint 20 with a slight gap, and the lower end thereof engages with the protrusion 24 of the joint 20. The notch 41 and the engaging portions 42 and 43 are provided. The notch 41 is a notch that is cut upward from the bottom surface of the yatco 40, and the width of the notch 41 is such that the protrusion 24 can be engaged with the engaging portions 42 and 43 through the notch 41. It is formed larger than the width of 24. Engagement portions 42 and 43 are formed on the axially upper portion of the notch 41 as notches that enter the circumferential direction. Although the engaging portions 42 and 43 are provided on the left and right sides in FIG. 3, they may be provided on the left side or the right side. The axial clearance dimension of the engaging portions 42, 43 is larger than the axial thickness dimension of the projection 24, and the inner end surfaces 45, 46 thereof are formed so as to make surface contact with the circumferential end surfaces 25, 26 of the projection 24. Has been done. When the projection 24 enters above the cutout 41 and rotates the yatco 40 about its axis, the engagement portion 45 or 46 engages with the projection 24, and the yatco 40 rotates the steel pipe pile about its axis. It can be done.

As shown in FIG. 4, the protrusion 24 also serves as a stopper with which the lower end surface of the joint 10 of the upper pile abuts when the joint 10 of the upper pile 100 is screwed into the joint 20 of the lower pile in the steel pipe pile. You can This stopper makes proper engagement between the male screw and the female screw, and when the seal ring 14 is provided on the upper end 27 of the joint 20 of the lower pile for sealing, the seal ring is appropriately compressed to have a holding action for ensuring the seal. It is an eggplant.

In normal pile construction, the steel pipe pile may be rotated around the axis while sequentially screwing the lower joint 10 of the upper pile into the upper joint 20 of the lower pile to construct up to the final pile length. It is not necessary to add the upper pile, but if the upper end of the pile falls below the operating range of the rotating device, or if the pile construction is interrupted during pile construction, the upper end of the pile is below the rotating construction range of the pile rotating device. It may be necessary to use Yatco if it is lowered up to this point and then pulled up again to join the upper pile. In the latter case, Yatco is used both in the direction of sinking the pile and in the direction of pulling it up.

When the joint of the present invention requires such a construction with a yatco, the yatco can be inserted into the direct pile joint and the construction can be carried out quickly without damaging the screw.

[0014]

[Effect of the invention]

 According to the present invention, when a pile is constructed using Yatco, it can be easily and quickly constructed without damaging the screw of the threaded joint, and the head portion of the lower pile can be temporarily constructed. It can be interrupted, the next pipe connection, etc. can be easily constructed, and accurate pile driving can be performed. In addition, with a pile that prevents the joint from slipping out even when the pile is reversed, it is easy to reverse and pull up the pile.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a joint of a steel pipe pile according to an embodiment.

FIG. 2 is a cross-sectional view of the joint of the steel pipe pile of the embodiment.

FIG. 3 is a partial perspective view of the yatco of the embodiment.

FIG. 4 is a vertical cross-sectional view showing a vertically joined state of the joint of the steel pipe pile of the embodiment.

[Explanation of Codes] 10 Joint 11 Male Thread 12 Guide Outer Cylinder Surface 13 Recess 14 Seal Ring 20 Joint 21 Female Thread 22 Guide Inner Cylinder Surface 23 Set Bolt Screw Hole 24 Protrusion 25, 26 Protrusion End Face 27 Upper End 30 Set Bolt 40 Yatco 41 Notch 42, 43 Engagement part 44 Outer peripheral surface 45, 46 Inner end surface 100, 110 Steel pipe pile

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Masanori Shimizu 1-1, Kawasaki-cho, Handa-shi, Aichi Kawasaki Steel Co., Ltd. Chita Works (72) Inventor, Koichi Okita 1-1-1, Kawasaki-cho, Handa-shi, Aichi Kawasaki Chita Works of Steel Manufacturing Co., Ltd.

Claims (3)

[Utility model registration claims] 1. A female screw which is screwed with a male screw at the lower end of the upper pile,
An inner guide cylinder that is adjacent to the lower side of the female screw and guides the outer circumference of the lower end cylinder of the upper pile, and a plurality of protrusions that are engaged in a yatco that rotates the pile about the axis and that protrudes inward at the lower end of the inner guide cylinder. A steel pipe pile joint characterized by being provided. 2. The yatco includes a cylindrical body having an outer diameter that fits loosely into the inner diameter of the female screw, and a hook-shaped notch that engages with the protrusion is provided at a lower end of the cylindrical body.
Joint for steel pipe pile as described. 3. The joint for a steel pipe pile according to claim 1, wherein the yatco and the protrusion have engaging portions in both directions that rotate the pile forward or backward about an axis.