JP3149730B2 - Method of joining steel pipe piles and joining jig used for the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining steel pipe piles and a jig used for the method.

[0002]

2. Description of the Related Art Conventionally, when connecting steel pipe piles used for civil engineering and building foundation work, end faces of two steel pipe piles are abutted on site and joined by welding. Not only is it troublesome and troublesome, but there are various problems such as poor vertical accuracy. Therefore, in recent years, joining by a screw joint type steel pipe pile in which a screw is provided at an end of a steel pipe pile and the steel pipe pile is joined directly or via a joint fitting has been spreading.

A thread joint type steel pipe pile of this kind is disclosed, for example, in Japanese Patent Application Laid-Open No. 64-21116 (conventional example 1). This threaded joint pile has a female thread at the upper end of the steel pipe pile and a screw at the lower end,
An inwardly projecting piece is provided in the hollow part of the steel pipe pile, and when installing the steel pipe pile in the excavation hole, the locking part of the pile rotating jig is engaged with the projecting piece, and the steel pipe pile is It is designed to be automatically screwed by rotating.

The steel pipe pile described in Japanese Patent Application Laid-Open No. 4-70414 (Conventional Example 2) is provided with parallel screws in opposite directions above and below the steel pipe pile, and parallel screws in opposite directions above and below the steel pipe pile. A connecting member having a plurality of rod-shaped operating portions on the outer periphery is interposed between the steel pipe piles, and the joint member is rotated via the rod-shaped operating portion by human power or a winch to join the steel pipe piles. .

Further, Japanese Patent Application Laid-Open No. 7-4572 (Conventional Example 3) discloses that a female threaded portion provided on the inner surface of the end of one of the steel pipes to be joined to each other has a large-diameter male threaded portion and an oppositely oriented male threaded portion. A stepped joint fitting having a small-diameter male screw portion and having a rotating rod insertion hole between both male screw portions is rotated with a rotating rod inserted into the rotating rod insertion hole, and the large-diameter male screw portion is screwed in. A female thread provided on the inner surface of the other end of the steel pipe is provided with a flange having a rotatable rod insertion hole at the outer periphery of one end, and has a female thread on the inner surface of the skirt and a male thread on the outer surface. The flanged fitting is rotated with the rotating rod inserted into the rotating rod insertion hole, and the male thread is screwed in.The small-diameter male screw of the stepped fitting is screwed into the female thread on the inner surface of the flange of the flanged fitting. The flange of the joint fitting with a rotating rod By moving the bonding method of the steel pipe to the two steel pipes screwed butt across the flange portion is described.

[0006]

The threaded joint pile of the prior art 1 requires special mechanical equipment for rotating the upper pile, and a special mechanism for lowering the leader according to the screwing speed of the upper pile. Machinery must be expensive because of the need for a simple structure. In addition, since it is necessary to provide an inward protruding piece for applying a rotational force to the joint pile in the hollow portion of each joint pile, manufacturing of the joint pile is troublesome and cost increases.

[0007] Further, the steel pipe pile of Conventional Example 2 is provided with a plurality of rod-shaped operating portions on the outer periphery of each connecting member, so that the cost is increased. Also, if the rod-shaped operation part is left as it is after joining the steel pipe pile, it will hinder the driving of the steel pipe pile and insertion into the excavation hole, so the rod-shaped operation part must be removed after joining. It is troublesome.

The method for joining steel pipes of the prior art 3 is troublesome in manufacturing since a rotary rod insertion hole must be provided in the stepped joint fitting and the flanged joint fitting, respectively. Is small, the rotating rod inserted therein may be broken, and if the hole diameter is large, the strength of the stepped fitting and the flanged fitting may be reduced.

The present invention has been made in order to solve the above-mentioned problems, and does not require special mechanical equipment, and can easily connect the second steel pipe pile to the first steel pipe pile by a detachable joining jig. The purpose is to obtain a method of joining steel pipe piles that can be joined. Another object of the present invention is to obtain a joining jig used for joining the steel pipe piles.

[0010]

A method of joining steel pipe piles according to the present invention is a ring-shaped joining method comprising connecting two ends of two arc-shaped members made of a steel plate with hinges and providing a plurality of projections on the outer periphery thereof. The jig is attached to the second steel pipe pile or the joint fitting, and the second metal pipe pile or the joint fitting and the joining jig are integrally joined by tightening the fastening fitting provided at the other end. , The second steel pipe pile or the joint fitting is rotated to screw the second steel pipe pile to the first steel pipe pile.

[0011] Further, the joining jig for steel pipe piles according to the present invention comprises:
One end of two arcuate members made of a steel plate are connected by a hinge so as to be openable and closable, and a clamp is attached to the other end, and a ring-shaped half-split band whose inner diameter is almost equal to the outer diameter of the steel pipe pile to be joined. And a plurality of projections fixed to the outer periphery of the half band.

[0012]

The arc-shaped member of the joining jig is opened outward, mounted on a second steel pipe pile or a joint fitting, wound, and integrally joined by tightening a fastening fitting. Then, the second steel pipe pile is positioned on the first steel pipe pile directly or via a joint fitting, and a rod-like body such as a gas pipe is inserted into the projection of the joining jig, and rotated by human power or a winch. As a result, the second steel pipe pile or the joint fitting frictionally connected to the joining jig also rotates, and the second steel pipe pile is screw-connected to the first steel pipe pile. When the joining is completed, the fastener is removed, and the joining jig is removed from the second steel pipe pile or the joint fitting.

[0013]

【Example】

Embodiment 1 FIG. FIG. 1 is a perspective view for explaining a method of joining steel pipe piles according to the present invention. In the figure, reference numeral 1a denotes a first steel pipe pile to which a steel pipe pile is joined (hereinafter referred to as a lower pile), and 1b denotes a second steel pipe pile to be joined to a lower pile 1a (hereinafter referred to as an upper pile).
The female screw 2 is provided at the upper end, and the male screw 3 corresponding to the female screw 2 is provided at the lower end.

Reference numeral 10 denotes a joining jig, an embodiment of which is shown in FIG. Reference numeral 11 denotes a ring-shaped half-band, which is formed by connecting one end of arc-shaped members 12a and 12b formed by bending a steel plate so as to be openable and closable by a hinge 13, and has an opening at the other end. A fastening fitting 14 is attached to the section side. 15a, 15b, 15c and 15d are pipe-shaped projections fixed to the outer periphery of the half band 11 at substantially equal intervals by welding. The projections 15a to 15d may be formed as solid bodies. Incidentally, the inner diameter D ₂ when closing the half-split band 11 is formed so as to be substantially equal to the outer diameter D ₁ of the upper pile 1b.

According to the present invention configured as described above, the lower pile 1 is provided.
In order to join the upper pile 1b to the upper pile 1a, first, the half-split band 11 of the joining jig 10 is widely opened centering on the hinge 13, fitted around the outer periphery of the upper pile 1b, and wound. The two are integrally joined by strongly tightening them to 1b. Then, the upper pile 1b is made substantially vertical, and its lower end surface is brought into contact with the upper end surface of the lower pile 1a. Next, a rod 16 such as a gas pipe is inserted into the protrusions 15a to 15d, and the rod 16 and the half band 11 are
, The upper thread 1b is rotated, the male screw 3 is screwed into the female thread of the lower pile 1a, and the two are integrally joined. When the joining is completed, the rod 16 is pulled out from the projections 15a to 15d,
The fastening jig 10 is removed from the upper pile 1b by removing the fastening fitting 14.

In the embodiment, the thickness of the half band 11 is set to 5
mm or more and 10 mm or less. This is because when the length is less than 5 mm, the fixing portions of the protrusions 15 a to 15 d to the half-split band 11 may be plastically deformed when rotating the upper pile 1 b, and when the length exceeds 10 mm, the rigidity becomes too large. This is because when wound around the upper pile 1b and rotated, it is not elastically deformed and does not adhere, so that the friction with the upper pile 1b is small, and there is a risk of turning around. In addition, if it is too thick, it becomes heavy and it is inconvenient to handle.

The width of the half band 11 is 40 mm.
It was made 100 mm or less. If it is less than 40 mm, the projections 15a to 15d are too narrow to be fixed easily, and if it exceeds 100 mm, the upper pile 1b may rotate without elastically deforming when rotating. Is too large to handle.

As described above, in the present invention, by imparting appropriate rigidity to the half band 11, the half band 11 in the vicinity of the projections 15a to 15d for applying a rotating force when rotating the upper pile 1b is formed. Upper pile 1 with moderate elastic deformation
This increases the frictional force with the upper pile 1b and reliably transmits the rotational force of the half band 11 to the upper pile 1b.

Next, specific examples of the present invention will be described. (1) Construction contents Landslide prevention pile construction (2) Steel pipe pile dimensions Outer diameter 406.4mm Wall thickness 24.0mm Length Lower pile 10m Upper pile 7m (3) Joining method Female screw at upper end of lower pile At lower end of upper pile Male screw (4) Jig Half band Thickness of steel plate 6mm Steel plate width 65mm Number of protrusions 4 (5) Rod gas pipe (6) Rotational force Insert gas pipe into protrusion of half band and apply human power The upper pile was rotated by the above. When the upper pile was rotated as described above, it was able to rotate extremely smoothly, and the upper pile was securely joined to the lower pile.

Embodiment 2 FIG. In the first embodiment, a case has been described in which the male screw 3 provided on the upper pile 1b is directly screwed into the screw 2 to be provided on the lower pile 1a and the two are joined, but in the present embodiment, the joint metal fitting is used. The lower pile and the upper pile are joined together. In FIG. 3, reference numeral 20a denotes a lower pile, on which an internal thread 21 is provided at the upper end. Reference numeral 20b denotes an upper pile, and at the lower end, a female screw 22 in the opposite direction to the female screw 21 of the lower pile 20a.
Is provided.

Reference numeral 23 denotes a tubular joint fitting. A flange 24 having an outer diameter substantially equal to the outer diameter of the lower pile 20a and the upper pile 20b is provided substantially at the center in the vertical direction. Is an external thread 25 in the same direction as the female thread 21 of the lower pile 20a.
The female screw 2 of the upper frame 20b
2 are provided in the same direction.

In order to join the upper pile 20b to the lower pile 20a,
First, the half band 11 of the joining jig 10 is attached to the flange 24 of the fitting 23 and tightened. Then, lower pile 20a
And the lower end of the upper pile 20b is in contact with the upper end thereof. Then, if the rod 16 is inserted into the projections 15a to 15d of the joining jig 10 and the joint fitting 23 is rotated via the joining jig 10,
The external thread 25 of the fitting 23 is screwed into the female thread 21 of the lower pile 20a, the female thread 22 of the upper pile 20b is threaded into the external thread 26 of the fitting 23, and the upper pile 20b is a flange of the fitting 23. It is joined to the lower pile 20a with the portion 24 interposed. When the joining is completed, the joining jig 10 is removed from the joint fitting 23.

[0023]

As is apparent from the above description, in the method for joining steel pipe piles according to the present invention, one end of two arc-shaped members made of a steel plate is connected by a hinge and a plurality of projections are provided on the outer periphery thereof. The plurality of ring-shaped jigs are attached to the second steel pipe pile or the joint fitting, and the fastening fitting provided at the other end is tightened to integrally connect the second steel pipe pile or the joint fitting to the joining jig. Then, the second steel pipe pile or the joint fitting is rotated through the joining jig to screw-connect the second steel pipe pile to the first steel pipe pile, so that the following effects can be obtained. it can.

(1) Since no special mechanical equipment is required for joining the steel pipe piles, equipment costs can be reduced. (2) No processing for rotation is required for individual steel pipe piles or fittings. For this reason, cost can be reduced, and there is no possibility of affecting the strength of the steel pipe pile or the joint fitting. (3) The rotational force can be reliably transmitted to the steel pipe pile or the joint fitting via the joining jig, and the screwing operation is easy.

Further, the joining jig for a steel pipe pile according to the present invention comprises:
One end of two arcuate members made of a steel plate are connected by a hinge so as to be openable and closable, and a clamp is attached to the other end, and a ring-shaped half-split band whose inner diameter is almost equal to the outer diameter of the steel pipe pile to be joined. And a plurality of projections fixed to the outer periphery of the half band, the structure is extremely simple, and the rotational force can be reliably transmitted to the steel pipe pile or the fitting.

[Brief description of the drawings]

FIG. 1 is a perspective view for explaining a first embodiment of the present invention.

FIG. 2 is a plan view and a side view of a joining jig according to the present invention.

FIG. 3 is an explanatory diagram of a second embodiment of the present invention.

[Explanation of symbols]

 1a, 20a First steel pipe pile 1b, 20b Second steel pipe pile 2, 21, 22 Female thread 3, 25, 26 Male thread 10 Joining jig 11 Half band 12a, 12b Arc-shaped member 13 Hinge 14 Tightening Fittings 15a to 15d Projection 16 Bar-shaped body 23 Joint fitting 24 Collar

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Gen Mori 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (56) References JP-A-4-70414 (JP, A) JP-A-8 158 359 (JP, A) Japanese Utility Model Showa 62-190730 (JP, U) Japanese Utility Model Showa 56-130034 (JP, U) Japanese Utility Model Showa 54-167511 (JP, U) Japanese Patent Publication No. 44-3448 (JP, B1) ) Jinsho 44-9308 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) E02D 5/24 101 E02D 5/28

Claims (2)

(57) [Claims] 1. A first steel pipe pile having a thread at an upper end,
In a method for joining a steel pipe pile directly or via a joint fitting to a second steel pipe pile having a screw screwed to a screw of the first steel pipe pile at a lower end portion, the second steel pipe pile or the joint fitting is provided. Then, one end of two arc-shaped members made of a steel plate is connected by a hinge, and a ring-shaped joining jig provided with a plurality of protrusions on the outer periphery thereof is mounted, and the other end is tightened by a fastener to integrally form. A method for joining steel pipe piles, comprising joining, rotating the second steel pipe pile or joint fitting via the joining jig, and joining the second steel pipe pile to the first steel pipe pile. 2. An annular member formed by connecting one end of two arc-shaped members made of a steel plate so as to be openable and closable by a hinge, and attaching a fastener to the other end, the inner diameter of which is substantially equal to the outer diameter of the steel pipe pile to be joined. And a plurality of protrusions fixed to the outer periphery of the half-band.