JPH08326051A - Connecting method of steel-pipe file and connecting jig used for connecting method thereof - Google Patents

Abstract

PURPOSE: To connect a steel-pipe pile surely by screws by a connecting jig having detachable simple structure without requiring a special installation. CONSTITUTION: A ring-shaped connecting jig 10, in which one ends of two arcuate-shaped members consisting of a steel plate are coupled by hinges and a plurality of projecting sections 15d are formed from an outer circumference, is installed to a second steel-pipe pile 1b or a joint fitting, and the second steel- pipe pile 1b or the joint fitting and the connecting jig 10 are united integrally by clamping a clamp 14 fitted at the other end. The second steel-pipe pile 1b or the joint fitting is rotated through the connecting jig 10, and the second steel-pipe pile 1b is joined with a first steel-pipe pile 1a by screws.

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 joining jig used for the method.

[0002]

2. Description of the Related Art Conventionally, when connecting steel pipe piles used for civil engineering, foundation work for construction, etc., the end faces of two steel pipe piles were abutted and joined by welding at the site. Not only is it troublesome and time-consuming, but there are various problems such as poor vertical accuracy. Therefore, recently, a screw joint type steel pipe pile, in which a screw is provided at an end portion of the steel pipe pile and the steel pipe pile is joined directly or through a joint fitting, is becoming widespread.

An example of this type of threaded joint type steel pipe pile is disclosed in Japanese Patent Laid-Open No. 64-21116 (conventional example 1). This screw type joint pile is provided with a female thread on the upper end of the steel pipe pile and a screw on the lower end,
Providing an inward projecting piece in the hollow part of the steel pipe pile, when installing the steel pipe pile in the excavation hole, engage the locking part of the pile rotating jig with the projecting piece and use the pile burying machine to mount the steel pipe pile. It is also designed to be rotated and automatically screwed.

Further, in the steel pipe pile disclosed in Japanese Patent Laid-Open No. 4-70414 (Prior Art 2), parallel threads in opposite directions are provided at the top and bottom of the steel pipe pile, and parallel threads in opposite directions are provided at the top and bottom. A connecting member having a plurality of rod-shaped operation portions on the outer circumference is interposed between both steel pipe piles, and the joint member is rotated through the rod-shaped operation portions by human power or a winch to join both steel pipe piles. .

Further, in Japanese Unexamined Patent Publication No. 7-4572 (conventional example 3), a female screw portion provided on an inner surface of an end portion of one steel pipe to be joined to each other has a large-diameter male screw portion and a direction opposite thereto. A small-diameter male threaded portion, and a stepped joint fitting having a rotary rod insertion hole provided between both male threaded portions is rotated by a rotating rod inserted into the rotary rod insertion hole to screw the large-diameter male threaded portion, A flange portion having a rotary rod insertion hole on the outer periphery of one end is projectingly provided on the female thread portion provided on the inner surface of the end of the other steel pipe, and a female thread portion is provided on the inner surface of the shroud portion and a male thread portion is provided on the outer surface Rotate the joint fitting with a collar with the rotating rod inserted in the rotary rod insertion hole to screw the male thread part, and screw the small diameter male screw of the stepped fitting into the female thread on the inner surface of the collar of the joint fitting with a collar. Use the rotating rod to attach the collar of the By moving the bonding method of the steel pipe to the two steel pipes screwed butt across the flange portion is described.

[0006]

The screw joint pile of Conventional Example 1 requires special mechanical equipment for rotating the upper pile, and lowers the leader in accordance with the screwing speed of the upper pile. However, the mechanical equipment becomes expensive. Further, since it is necessary to provide an inwardly projecting piece for giving a rotational force to the joint pile in the hollow portion of each joint pile, the manufacture of the joint pile is troublesome and the cost is increased.

Further, in the steel pipe pile of Conventional Example 2, since a plurality of rod-shaped operating portions are provided on the outer circumference of each connecting member, the cost increases. In addition, if the rod-shaped operating part is left as it is after joining the steel pipe piles, it will hinder the driving of the steel pipe piles and the insertion into the excavation hole. It is troublesome.

In the method of joining the steel pipes of Conventional Example 3, since the rotary rod insertion holes must be provided in the stepped joint fitting and the flanged joint fitting respectively, the manufacturing is troublesome, and the diameters of these rotary rod insertion holes are large. When is small, the rotating rod inserted therein may be broken, and when the hole diameter is large, strength of the stepped joint fitting and the flanged joint fitting may be reduced.

The present invention has been made in order to solve the above problems, and does not require any special mechanical equipment, and the second steel pipe pile can be easily converted into the first steel pipe pile by the detachable joining jig. The purpose is to obtain a method for joining steel pipe piles that can be joined. Moreover, this invention aims at obtaining the joining jig used for joining the said steel pipe pile.

[0010]

A method of joining steel pipe piles according to the present invention is a ring-like joining method in which one end of two arc-shaped members made of steel plates are connected by a hinge and a plurality of protrusions are provided on the outer periphery thereof. The jig is attached to the second steel pipe pile or the joint fitting, and the fastening fitting provided at the other end is tightened to integrally join the second steel pipe pile or the joint fitting and the joining jig, and the joining jig The second steel pipe pile or the joint fitting is rotated through the screw so that the second steel pipe pile is screwed to the first steel pipe pile.

The joining jig for steel pipe piles according to the present invention is
A ring-shaped half band that has two arc-shaped members made of steel plates connected to each other at one end by a hinge so as to be openable and closable, and has a fastening metal fitting attached to the other end, the inner diameter of which is approximately 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.

[0012]

The arc-shaped member of the joining jig is opened to the outside, mounted on the second steel pipe pile or the joint fitting, and wound, and the fastening fitting is tightened to be integrally connected. Then, the second steel pipe pile is positioned on the first steel pipe pile directly or via the joint fitting, a rod-shaped body such as a gas pipe is inserted into the protrusion of the joining jig, and rotated by human power or a winch. As a result, the second steel pipe pile or joint fitting frictionally coupled to the joining jig also rotates, and the second steel pipe pile is screwed to the first steel pipe pile. When the joining is completed, remove the tightening fitting and remove the joining jig from the second steel pipe pile or the fitting.

[0013]

【Example】

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

Reference numeral 10 is a joining jig, an embodiment of which is shown in FIG. Reference numeral 11 denotes a ring-shaped half band, which is formed by bending one end of arcuate members 12a and 12b formed by bending a steel plate to be opened and closed by a hinge 13 to form a ring shape. A tightening fitting 14 is attached to the part side. Reference numerals 15a, 15b, 15c, and 15d denote pipe-shaped protrusions fixed to the outer periphery of the half band 11 by welding at substantially equal intervals. The protrusions 15a to 15d may be solid bodies. The inner diameter D ₂ when the half band 11 is closed is formed to be substantially equal to the outer diameter D ₁ of the upper pile 1b.

The lower pile 1 according to the present invention constructed as described above
In order to join the upper pile 1b to a, first, the half band 11 of the joining jig 10 is largely opened around the hinge 13, and the upper pile 1b is fitted and wound around the upper pile 1b. 1b is strongly tightened to integrally connect the two. 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. Then, the rod-shaped body 16 such as a gas pipe is inserted into the protrusions 15a to 15d, and the rod-shaped body 16 and the half band 11 are manually operated or winched.
The upper pile 1b is rotated through the screw, and the male screw 3 is screwed into the female screw of the lower pile 1a to join them together. When the joining is completed, pull out the rod-shaped body 16 from the protrusions 15a to 15d,
The fastening metal fitting 14 is removed and the joining jig 10 is removed from the upper pile 1b.

In the embodiment, the thickness of the half band 11 is 5
It was set to be 10 mm or more and 10 mm or less. If it is less than 5 mm, the fixed portion of the protrusions 15a to 15d to the half band 11 may be plastically deformed when the upper pile 1b is rotated, and if it exceeds 10 mm, the rigidity becomes too large. This is because when it is wound around the upper pile 1b and is not rotated, it does not elastically deform and does not come into close contact with the upper pile 1b, so that the friction with the upper pile 1b is small, and there is a turning around. If it is too thick, it will be heavy and inconvenient to handle.

The width of the half band 11 is 40 mm.
It is set to 100 mm or less. If it is less than 40 mm, it is too narrow to fix the protrusions 15a to 15d easily, and if it exceeds 100 mm, it may rotate without elastically deforming when the upper stake 1b is rotated. It is difficult to handle because it becomes large.

As described above, in the present invention, the half band 11 is provided with appropriate rigidity so that when the upper pile 1b is rotated, the half band 11 in the vicinity of the protrusions 15a to 15d which gives a rotational force. Proper elastic deformation causes upper pile 1
The frictional force with b is increased, and the rotational force of the half band 11 is reliably transmitted 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 406.4 mm Wall thickness 24.0 mm Length Lower pile 10 m Upper pile 7 m (3) Joining method Lower screw upper end female screw on upper pile lower end Male screw (4) Fixture Half band Steel plate thickness 6 mm Steel plate width 65 mm Number of protrusions 4 (5) Rod-shaped gas pipe (6) Rotational force Insert the gas pipe into the protrusion of the half band and put it in human power. Rotating the upper pile by rotating the upper pile as described above, the rotation was extremely smooth, and the upper pile could be reliably joined to the lower pile.

Example 2. 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 to join the two, but in the present embodiment, a joint metal fitting is used. The lower and upper piles are joined together. In FIG. 3, 20a is a lower pile, and an internal thread 21 is provided at the upper end. 20b is an upper pile, and a lower end thereof has a female screw 22 in a direction opposite to the female screw 21 of the lower pile 20a.
Is provided.

Reference numeral 23 is a tubular joint fitting, and a collar portion 24 having an outer diameter substantially equal to the outer diameters of the lower pile 20a and the upper pile 20b is provided at the substantially central portion in the vertical direction, and at the lower portion of the collar portion 24. Is an external thread 25 in the same direction as the internal thread 21 of the lower pile 20a.
However, the female screw 2 of the upper frame 20b is also provided on the upper portion of the collar portion 24.
Two external threads 26 in the same direction as 2 are provided.

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 brim portion 24 of the joint fitting 23 and tightened. Then, the lower pile 20a
The lower end portion of the joint metal fitting 23 is brought into contact with the upper end portion of, and the lower end portion of the upper pile 20b is brought into contact with the upper end portion thereof. Then, by inserting the rod-shaped body 16 into the protrusions 15a to 15d of the joining jig 10 and rotating the joint fitting 23 through the joining jig 10,
The male screw 25 of the joint metal fitting 23 is screwed into the female screw 21 of the lower pile 20a, the female screw 22 of the upper pile 20b is screwed into the male screw 26 of the joint metal fitting 23, and the upper pile 20b is connected to the collar of the joint metal fixture 23. It is joined to the lower pile 20a with the portion 24 interposed therebetween. 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 steel plates is connected by a hinge and a plurality of protrusions 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 join the second steel pipe pile or the joint fitting with the joining jig. Then, the second steel pipe pile or the joint fitting is rotated through this joining jig to screw-join 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 for joining steel pipe piles is required, the equipment cost can be reduced. (2) It is not necessary to process each steel pipe pile or joint fitting for rotation. Therefore, the cost can be reduced, and there is no fear of affecting the strength of the steel pipe pile or the joint fitting. (3) The rotating force can be reliably transmitted to the steel pipe pile or the joint fitting through the joining jig, and the screwing operation is easy.

The joining jig for steel pipe piles according to the present invention is
A ring-shaped half band that has two arc-shaped members made of steel plates connected to each other at one end by a hinge so as to be openable and closable, and has a fastening metal fitting attached to the other end, the inner diameter of which is approximately equal to the outer diameter of the steel pipe pile to be joined. And a plurality of protrusions fixed to the outer circumference of the half band, the structure is extremely simple, and the rotational force can be reliably transmitted to the steel pipe pile or the joint fitting.

[Brief description of 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 1st steel pipe pile 1b, 20b 2nd steel pipe pile 2,21,22 Female screw 3,25,26 Male screw 10 Joining jig 11 Half band 12a, 12b Arc member 13 Hinge 14 Tightening Metal fittings 15a to 15d Projection portion 16 Bar-shaped body 23 Joint fitting 24 Collar portion

Front Page Continuation (72) Gen Mori Gen 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.

Claims (2)

[Claims] 1. A first steel pipe pile having a screw at an upper end thereof,
A steel pipe pile joining method of joining a second steel pipe pile having a screw threaded to a screw of the first steel pipe pile at a lower end portion thereof directly or through a joint fitting, wherein the second steel pipe pile or joint fitting In addition, one end of two arc-shaped members made of steel plates is connected by a hinge, and a ring-shaped joining jig having a plurality of protrusions on its outer circumference is attached, and the other end is fastened by a fastening metal fitting to integrally A method for joining steel pipe piles, which comprises joining and rotating the second steel pipe piles or joint fittings through the joining jig to join the second steel pipe piles to the first steel pipe piles. 2. A ring shape in which one end of two arc-shaped members made of steel plates is openably and closably connected by a hinge, and a fastening metal fitting is attached to the other end, the inner diameter of which is approximately equal to the outer diameter of a steel pipe pile to be joined. A jig for joining steel pipe piles, which comprises a half band and a plurality of protrusions fixed to the outer periphery of the half band.