JP4383535B2 - Steel pipe fitting - Google Patents

Description

  The present invention relates to a steel pipe connector such as a steel pipe pile, and more particularly to a steel pipe connector using a backing metal fitting.

As a conventional steel pipe connector, there has been proposed one in which a backing metal fitting is inserted into two steel pipes to be connected (for example, see Patent Document 1).
A conventional steel pipe connector will be described with reference to FIG.
Fig.4 (a) is a perspective view of a steel pipe and a steel pipe connector, FIG.4 (b) is sectional drawing of the state which inserted the steel pipe connector in the steel pipe.
In FIG. 4, 11 and 12 are steel pipes, and 2 is a backing metal fitting.
In the cylindrical backing metal fitting 2 constituting the steel pipe connector, four protrusions 2T1 to 2T4 are formed in the circumferential direction substantially at the center of the peripheral surface. The protrusions 2T1 to 2T4 have two cuts at positions where the protrusions 2T1 to 2T4 of the belt-shaped steel plate are formed at intervals corresponding to the thicknesses of the protrusions (the thickness or width in the axial direction of the backing metal fitting 2). And is formed by extruding between the cuts outward. The extrusion is performed by press working using a mold, for example. The outer diameter of the backing metal fitting 2 is set to be smaller than the inner diameters of the steel pipes 11 and 12 so that the backing metal fitting 2 can be fitted into both steel pipes.

  The backing metal fitting 2 is fitted into both the steel pipes 11 and 12 as shown in FIG. Between the end surface 111 of the steel pipe 11 and the end surface 121 of the steel pipe 12, protrusions 2T1 to 2T4 of the backing metal fitting 2 are interposed. That is, there is a gap between the steel pipe 11 and the steel pipe 12 corresponding to the thickness of the protrusions 2T1 to 2T4 (the thickness or width in the axial direction of the backing metal fitting 2). This gap is a so-called route interval. The steel pipes 11 and 12 are connected by joining the end surface 111 and the end surface 121 by welding. The gap between the end surface 111 and the end surface 121 is filled with a molten weld material.

Japanese Patent Laid-Open No. 11-158866

The backing metal fitting that constitutes a conventional steel pipe connector must have protrusions formed by pressing or the like, but an expensive mold or pressing device is required for pressing. In addition, the gap between the two steel pipes, that is, the route interval, must be set to a size suitable for the thickness of the steel plate of the steel pipe, but the route interval is determined by the thickness of the projection of the backing metal, so the route interval In order to change the thickness, the thickness of the protrusion of the backing metal must be changed, and for that purpose, the mold must also be changed.
Therefore, the conventional steel pipe connector has a high manufacturing cost and the route interval cannot be easily changed.
An object of the present invention is to provide a steel pipe connector that can be manufactured at low cost and can easily change the route interval in view of the above-mentioned problems of conventional steel pipe connectors.

In order to achieve the above object, the steel pipe connector according to the present invention forms a plurality of holes at the same height at predetermined intervals in the circumferential direction at substantially the center of the peripheral surface of the cylindrical backing metal fitting. Yes and, the holes are inserted through a single metal wire two to plural sets provided two holes of each pair in the pair, its metal lines extending outward from the peripheral surface of the backing metal It is characterized by.
In the steel pipe connector according to claim 2 , a plurality of notches are formed at predetermined intervals in the circumferential direction on the peripheral surface of the cylindrical backing metal, and the bottoms of these notches are the periphery of the backing metal. located substantially center position of the same height of the surfaces, their notches will be two to a set fitting a plurality of sets disposed one metal line-out two notches of each set, the metal wire is the It is characterized by extending outward from the peripheral surface of the backing metal fitting.
The steel pipe connector according to claim 3 is the steel pipe connector according to claim 1 or 2, wherein the metal wires intersect with each other and bend at a portion corresponding to at least the wire diameter of the metal wires. It is characterized by that.

Since the steel pipe connector of the present invention is constituted by a backing metal fitting having a plurality of holes or notches formed on the peripheral surface and a plurality of metal wires, the structure is simplified. And since a backing metal fitting can be produced only by forming a hole or a notch in a strip-shaped steel plate or a cylindrical body of a steel material, it can be produced without using a mold or the like as in the prior art. Therefore, the steel pipe connector of the present invention can be made at low cost. Further, since the route interval is determined by the thickness (diameter) of the metal line, it can be set to a desired size by changing the thickness of the metal line. That is, the steel pipe connector of the present invention can set a desired route interval by simply changing the thickness of the metal wire without forming protrusions with different thicknesses as in the case of conventional backing metal fittings. Becomes easier. In addition, the backing metal fitting of the present invention can be created simply by forming a hole or notch in a strip-shaped steel plate or a cylindrical body of steel material, so if it is necessary to correct the position of the hole or notch at the construction site, Can be corrected.
Since the metal wire of the steel pipe connector of the present invention remains in the backing metal fitting after the steel pipe is connected, it is useful as a reinforcing material. In this case, the reinforcing effect is further increased when the metal wires intersect.

A steel pipe connector according to an embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is used for the part common to each figure.
Fig.1 (a) is a perspective view of a steel pipe and a steel pipe connector, FIG.1 (b) is a perspective view of a backing metal fitting.
In FIG. 1, 11 and 12 are steel pipes, 2 is a backing metal fitting, and 31 and 32 are metal wires such as iron.
The steel pipe connector comprises a cylindrical backing metal fitting 2 made of a metal such as a steel material and metal wires 31, 32. The backing metal fitting 2 has four holes 2H1 to 2H4 in the circumferential direction substantially at the center of the peripheral surface. Is formed. The holes 2H1 to 2H4 are arranged at the same height (the same plane perpendicular to the axial direction of the backing metal fitting 2).

The metal wire 31 is inserted through the holes 2H1 and 2H3, and the metal wire 32 is inserted through the holes 2H2 and 2H4. That is, the four holes 2H1 to 2H4 are grouped in two, and the metal wires 31 and 32 are inserted into the two sets of holes (holes 2H1, 2H3 and holes 2H2, 2H4), respectively. Both end portions of both metal wires are extended outward from the peripheral surface of the backing metal fitting 2. The length extending to the outside is set to be about the thickness (thickness) of the steel plates 11 and 12 or more. Note that the metal wires 31 and 32 are bent at an amount corresponding to at least the diameter of the metal wire at the intersecting portion.
The outer diameter of the backing metal fitting 2 is smaller than the inner diameters of the steel pipes 11 and 12, and is set to a size that allows the backing metal fitting 2 to be fitted into both steel pipes. If the outer diameter of the backing metal fitting 2 is too small, the gap between the inner surfaces of the steel pipes 11 and 12 and the peripheral surface (outer circumferential surface) of the backing metal fitting 2 becomes large, so It can flow into the steel pipe.
The backing metal fitting 2 is formed by forming holes 2H1 to 2H4 at predetermined intervals in a strip-shaped steel plate and bending the steel plate into a cylindrical shape. In that case, the joints of the steel plates may be separated. Therefore, the case where the magnitude | sizes of the internal diameter of the steel pipes 11 and 12 differ can be coped with by adjusting the space | interval of the joint line. The backing metal fitting 2 can be formed by forming holes 2H1 to 2H4 on the peripheral surface of a cylindrical body made of steel.
Although the metal wires 31 and 32 are crossed, the metal wire 31 may be inserted into the holes 2H1 and 2H4 and the metal wire 32 may be inserted into the holes 2H2 and 2H3 so as to be parallel, for example. In this case, the metal wires 31 and 32 need not be bent.

2 shows a state in which a backing metal fitting is fitted into two steel pipes, FIG. 2 (a) is a side view, FIG. 2 (b) is a plan view in the X1 direction of FIG. 2 (a), FIG. (C) is sectional drawing of the X2 part of FIG.2 (b).
The backing metal fitting 2 is fitted into the upper steel pipe 11 and the lower steel pipe 12, and the end surfaces 111 and 121 of both steel pipes are butted and connected. At this time, the metal wires 31 and 32 are interposed between the end surfaces 111 and 121 of the metal wires 31 and 32, and both end surfaces are held at an interval corresponding to the diameter of the metal wire. Therefore, the route interval between the end surfaces 111 and 121 of the steel pipes 11 and 12 is determined by the diameter of the metal wires 31 and 32.

Here, the route interval is set to about 2.3 to 3.2 mm, for example, and when the thickness (wall thickness) of the steel pipes 11 and 12 is 5.0 mm or more, the distance between the steel plates is about 3.2 mm. When the thickness is less than 5.0 mm, the thickness is set to about 2.3 mm. Accordingly, the metal wires 31 and 32 having a diameter of about 2.3 to 3.2 mm are used. Further, the width (height) in the axial direction of the backing metal fitting 2 is set to about 40 mm, and the thickness (wall thickness) of the steel plate is set to about 2.3 mm.
The steel pipes 11 and 12 are connected by joining the end surface 111 and the end surface 121 by welding. The gap between the end surface 111 and the end surface 121 is filled with a molten weld material. During the welding, the portions of the metal wires 31 and 32 extending outward from the backing metal fitting 2 may be melted or used as part of the welding material.

Since the backing metal fitting 2 of the present embodiment only needs to form a hole in a strip-shaped steel plate or a cylindrical body of steel material, the structure becomes simple and can be produced without using a mold or the like as in the prior art. Therefore, the backing metal fitting 2 of this embodiment can be made at low cost. Further, since the route interval in this embodiment is determined by the diameters of the metal wires 31 and 32, the route interval can be easily changed by using the metal wires 31 and 32 having different diameters. That is, in this embodiment, a desired route interval can be set only by changing the diameters of the metal wires 31 and 32 without forming protrusions having different thicknesses as in the case of a conventional backing metal fitting. Moreover, since the backing metal fitting 2 of this embodiment can be created only by forming a hole in a strip-shaped steel plate or a cylindrical body of steel material, the position of the hole can be easily corrected at the construction site.
In the steel pipe connector of the present embodiment, the metal wires 31 and 32 remain in the backing metal fitting 2 even after the steel pipes 11 and 12 are connected by welding, so that the remaining metal wires also serve as a reinforcing material.

FIG. 3 shows a modification of the steel pipe connector. Fig.3 (a) is a perspective view of a steel pipe and a steel pipe connector, FIG.3 (b) is a perspective view of a backing metal fitting.
The steel pipe connector of FIG. 3 has four notches (recesses) 2G1 to 2G4 in the circumferential direction on the peripheral surface of the backing metal fitting 2 instead of the four holes of the backing metal fitting 2 of FIGS. The metal wire 31 is inserted into the notches 2G1 and 2G3, and the metal wire 32 is inserted into the notches 2G2 and 2G4. That is, the four notches 2G1 to 2G4 are made into a set of two, and the metal wires 31 and 32 are fitted into two notches (the notches 2G1 and 2G3 and the notches 2G2 and 2G4), respectively.
The bottoms of the four notches 2G1 to 2G4 are located at the approximate center of the peripheral surface of the backing metal fitting 2. The backing metal fitting 2 is inserted into the lower steel pipe 12 on the side of the notches 2G1 to 2G4 and is inserted into the upper steel pipe 11 on the opposite side. In the case of this example, since it is only necessary to fit the metal wires 31 and 32 into the notches 2G1 to 2G4, it becomes easy to attach the metal wires 31 and 32 to the backing metal fitting 2.
The backing metal fitting 2 can be formed by forming notches 2G1 to 2G4 at predetermined intervals in a strip-shaped steel plate, bending the steel plate into a cylindrical shape, and notching 2G1 to the peripheral surface of a cylindrical body made of steel. It can also be created by forming 2G4.

  Although the said Example demonstrated the example which forms two holes or notches in the backing metal fitting 2, and attaches two metal wires, four or more holes or notches are formed, and two or more metal wires are formed. It can also be configured to be attached. Moreover, the backing metal fitting 2 can also be configured to connect two steel pipes having different inner diameters by making the upper and lower outer diameters different. In that case, the part which enlarges the outer diameter of the backing metal fitting 2 can enlarge an outer diameter by attaching the steel plate for thickness adjustment to the circumference | surroundings of the part, for example. The metal wire is not limited to a circular cross section, but may be a polygonal one.

It is a perspective view of the steel pipe connector and steel pipe concerning the example of the invention in this application. It is a figure which shows the state which attached the steel pipe connector which concerns on the Example of this invention to the steel pipe. It is a figure which shows the modification of the backing metal fitting of the steel pipe connector which concerns on the Example of this invention. It is the perspective view of the conventional steel pipe connector, a steel pipe, and sectional drawing of the state which attached the steel pipe connector to the steel pipe.

Explanation of symbols

11, 12 Steel pipe 2 Back fitting 2H1-2H4 Hole 2G1-2G4 Notch 31, 32 Metal wire

Claims (3)

Substantially at the center of the peripheral surface of the cylindrical backing metal in the circumferential direction Yes formed at the same height a plurality of holes at predetermined intervals, 2 each set of the holes to the two to a set a plurality of sets One steel wire is inserted into each hole, and the metal wire extends outward from the peripheral surface of the backing metal fitting. A plurality of notches are formed at predetermined intervals in the circumferential direction on the circumferential surface of the cylindrical backing metal fitting, and the bottoms of these notches are located at the same height at the approximate center of the circumferential surface of the backing metal fitting. There, they notch of fitting a single metal wire two in-out two notches of each set provided with a plurality of sets in a set, the metal lines extend outward from the circumferential surface of the backing metal A steel pipe connector characterized by comprising: The steel pipe connector according to claim 1 or 2, wherein the metal wires cross each other and are bent at an amount corresponding to at least a wire diameter of the metal wire at the intersecting portion. .

Images