JP4751350B2 - Steel pipe fittings - Google Patents

Description

  The present invention relates to a steel pipe joint member.

It may be necessary to connect and extend steel pipes that transmit rotational force on the same axis.
In that case, as shown in FIG. 9, the simple structure includes a connection by welding (FIG. 9 left), a connection by screws (center of FIG. 9), or a connection through which a pin penetrates (right of FIG. 9). Not long before known.

The above-described conventional steel pipe joint member has the following problems.
<1> The method of directly welding and connecting the ends of two steel pipes requires a specialized welder for welding, and requires a lot of skill and time to work, and is inconvenient because it cannot be done in rainy weather. . As the work takes time, the already inserted steel pipe is tightly tightened by the surrounding earth pressure, and a large rotational force is required after welding.
<2> The joint structure in which the screw tube is welded to the end of the steel pipe and connected by this screw cylinder requires the work of welding the male and female screw cylinders, and if rotation is applied in the opposite direction, There is a problem that the connection is broken.
<3> In the method of penetrating the pins, if the diameters are the same, the work of overlapping and penetrating the pins cannot be performed. Therefore, it is necessary to prepare two steel pipes with different diameters whose ends are expanded. This is an uneconomical method that requires the trouble of opening the through hole with both steel pipes covered.
<4> In any method, a process of processing a part of the steel pipe is required, and a method of connecting and using a commercially available steel pipe without being processed is not put into practical use.

In order to solve the above-described problems, a steel pipe joint member according to the present invention is a joint member that connects two steel pipes on the same axis, and the inner cylinder is located inside the outer cylinder. The outer cylinder is provided with a screw hole toward the central axis of the cylinder, the inner cylinder is formed with a receiving groove at a position corresponding to the screw hole, and the connecting steel pipe is interposed between the outer cylinder and the inner cylinder. It is characterized by a steel pipe joint member that is inserted and screwed into a screw hole to bulge a part of the steel pipe to the groove side .
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Furthermore, the present invention is a joint member for connecting two steel pipes on the same axis, and is constituted by a double cylinder in which the inner cylinder is positioned inside the outer cylinder, and the outer cylinder is directed to the central axis of the cylinder A through hole is provided, a nut seat for receiving the nut is recessed inside the through hole, a receiving groove is formed in the inner cylinder at a position corresponding to the nut seat, and the connecting steel pipe is connected to the outer cylinder and the inner cylinder. It is characterized by a steel pipe joint member that is inserted between the bolts and screwed into a nut seat to bulge part of the steel pipe to the groove side .

Furthermore, the present invention is a joint member that connects two steel pipes on the same axis, and includes a double cylinder in which the inner cylinder is positioned inside the outer cylinder, and a reaction force ring that can be fitted to the outside of the outer cylinder. The outer cylinder is provided with a through hole toward the central axis of the cylinder, and the reaction force ring is provided with an insertion hole at a position corresponding to the through hole when the reaction force ring is fitted to the outside of the outer cylinder. The inner diameter of the through hole is configured to accommodate the nut, the inner cylinder is formed with a receiving groove at a position corresponding to the through hole, and the connecting steel pipe is inserted between the outer cylinder and the inner cylinder, The present invention is characterized by a steel pipe joint member in which a bolt is screwed into a through hole nut of a force ring to bulge a part of the steel pipe to the groove side .

Since the steel pipe joint member of the present invention is as described above, the following effects can be obtained.
<1> It is possible to quickly connect using only the joint jig without welding the steel pipe or making a hole. That is, it is a great feature that it can be connected to a steel pipe without being processed.
<2> Even if the steel pipe is rotated in either the left or right direction, it is not disassembled like a screw.
<3> Since the work of connecting the steel pipes is simple and does not require skill or long time, the steel pipes that have already been placed are not clamped by the earth pressure in the ground, and can be rotated with a small rotational force. Economical.
<4> Since the steel pipe expands and deforms toward the bottom of the receiving groove in the narrow space between the outer cylinder and the inner cylinder, friction can be obtained with a wide contact surface, Since the vertical edge of the receiving groove formed at an acute angle bites into the steel pipe, even a large rotational force can be reliably transmitted, and there is no concern about shear failure as in the case where a bolt hole is formed.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

<1> Use of the present invention.
As shown in FIG. 8, the present invention is a joint member B that is used when two steel pipes A, that is, the lower end of the lower steel pipe A1 are connected to the lower end of the upper steel pipe A2 on the same axis.
The two steel pipes A connected by the joint member B of the present invention are not only separated from the lower steel pipe A1 even when the upper steel pipe A2 is lifted, but also the rotational force applied to the upper steel pipe A2 is applied to the lower steel pipe A2. Can be transmitted to A1.

<2> Double cylinder.
The joint member B of the present invention is constituted by an outer cylinder 1 and an inner cylinder 2 which are steel cylinders penetrating.
That is, it is a double cylinder in which the inner cylinder 2 is positioned concentrically inside the outer cylinder 1.
Between the outer cylinder 1 and the inner cylinder 2, a bowl-shaped connection shelf 3 is interposed, and the connection shelf 3 can be connected to form an integral structure.
The distance between the inner surface of the outer cylinder 1 and the outer surface of the inner cylinder 2 is slightly larger than the thickness of the steel pipe A to be connected.
As a result, it is possible to insert another steel pipe A between the outer cylinder 1 and the inner cylinder 2 from above and below the double cylinder and arrange them on the same axis.

<3> Outer cylinder 1.
The inner diameter of the outer cylinder 1 is formed to be slightly larger than the outer diameter of the steel pipe A so that the steel pipe A to be connected can be easily inserted.
The outer cylinder 1 is provided with a screw hole 11 at an appropriate position toward the central axis of the outer cylinder 1. The screw hole 11 can be configured by welding a nut to the outside of the through hole of the outer cylinder 1, for example.
Alternatively, the material of the outer cylinder 1 can be directly threaded.
A bolt 12 is screwed into the screw hole 11 from the outside of the outer cylinder 1 to deform the steel pipe A inserted into the outer cylinder 1.

<4> Inner cylinder 2.
The inner cylinder 2 is a short tube located inside the outer cylinder 1.
The outer diameter of the inner cylinder 2 is formed to be slightly smaller than the inner diameter of the steel pipe A so that it can be easily inserted into the steel pipe A to be connected.

<5> Receiving groove.
One feature of the present invention is that a receiving groove 21 is formed on the outer surface of the inner cylinder 2. (Figure 3)
The receiving groove 21 is a structure that is recessed by a certain depth from the outer surface of the inner cylinder 2.
For example, it is formed by a groove, a square hole, a round hole, a mortar-like hole or the like, but all are concave portions having a bottom and do not penetrate to the inside of the inner cylinder 2.
Further, although referred to as a “groove”, it does not mean that a length is provided like a side groove provided on a road, and may be a “hole” as described above.
On the contrary, it is also possible to adopt a configuration having a length and having the upper end of the receiving groove 21 reaching the upper end of the inner cylinder 2. In that case, the notch of the receiving groove 21 is exposed at the end surface of the inner cylinder 2.
The receiving groove 21 in the figure shows an embodiment formed by digging into the outer surface of the inner cylinder 2 up to the connection shelf 3.
However, like a square hole, a round hole, or a mortar-shaped hole, it is also possible to provide only a bottomed recess as a bottomed recess that is not connected to the connecting shelf 3.
The left and right edges 22 and the upper edge 22 of the receiving groove 21 and the lower edge 22 depending on the structure are formed at an acute angle.
The position of the receiving groove 21 is formed on the axis of the screw hole 11 provided in the outer cylinder 1, that is, at a position corresponding to the screw hole 11.

<6> Joint method.
Next, a method for connecting the steel pipe A1 and the steel pipe A2 using the joint member B of the present invention will be described.

<7> Insert steel pipe A. (Fig. 8)
The lower part of the joint member B of the present invention is fitted to the upper end of the preceding steel pipe A1 that has already been installed vertically toward the ground.
That is, the upper end of the preceding steel pipe A1 is fitted in a state of being inserted between the outer cylinder 1 and the inner cylinder 2 below the joint member B.
Next, the lower part of the steel pipe A2 to be connected is inserted from the upper part of the joint member B.
That is, the lower end of the connection steel pipe A2 is fitted in a state of being inserted between the outer cylinder 1 and the inner cylinder 2 at the upper part of the joint member B.
In this case, since the outer cylinder 1 and the inner cylinder 2 are connected by the hook-shaped connecting shelf 3, the end portions of the steel pipes A1 and A2 are in contact with the connecting shelf 3 and the insertion dimension is determined. Become.

<8> Pressurization with a bolt 12. (Fig. 4)
By inserting the steel pipe A into the joint member B, the steel pipe A is positioned between the screw hole 11 and the receiving groove 21.
Bolts 12 are screwed into the screw holes 11.
The tip of the bolt 12 immediately comes into contact with the outer surface of the steel pipe A. However, when the bolt 12 is screwed in strongly, a part of the steel pipe A bulges toward the receiving groove 21 due to the driving force, and the bottom surface of the receiving groove 21 faces the bottom surface. Deforms to contact.
Since the edge 22 around the receiving groove 21 is sharpened at an acute angle, it is particularly easily deformed.
The bolt 12 is strongly screwed into all the screw holes 11 of the joint member B, so that the preceding steel pipe A located on the lower side and the steel pipe A connected on the upper side are collinear with each other via the joint member B. They will be connected together.

<9> Force transmission.
If comprised as mentioned above, the force of the perpendicular direction from the upper steel pipe A to the lower steel pipe A will be transmitted to the lower steel pipe A via the intermediate | middle connection shelf board 3. FIG.
The rotational force is transmitted as follows.
That is, (1) The bulging portion of the steel pipe A deformed toward the inner side of the receiving groove 21 bites into the edge 22 around the receiving groove 21 and reliably transmits the rotational force.
Further, (2) since the steel pipe A inserted into the narrow gap between the outer cylinder 1 and the inner cylinder 2 is expanded and deformed inward at the position of the receiving groove 21, the deformation surface of the steel pipe A is the same as that of the receiving groove 21. A large friction can be obtained by surface contact with the bottom.
Furthermore, (3) force is transmitted by the frictional force between the tip of the bolt and the deformed steel pipe A. When this point is disassembled after the experiment, it is clear from the fact that the surface of the steel pipe A is cut to a certain depth by the bolt tip.

<10> Other embodiment 1. (Fig. 5)
In the above example, when the screw hole 11 is opened in the outer cylinder 1, a nut is welded to the outer side of the outer cylinder 1 or the material of the outer cylinder 1 is threaded.
However, a configuration in which the screw hole 11 is not directly opened in the outer cylinder 1 can be employed.
That is, instead of the screw hole 11, the outer cylinder 1 is formed with a through hole 13 that is not threaded toward the central axis of the cylinder.
A nut seat 14, which is a recess having a larger area than the cross section of the through hole 13, is provided inside the through hole 13.
The nut seat 14 is formed in a hexagonal shape, for example, and is configured so that a commercially available nut 15 can be stored in the nut seat 14.
A receiving groove 21 is formed in the inner cylinder 2 at a position corresponding to the nut seat 14, and the forming cross section of the receiving groove 21 is formed wide toward the central axis of the cylinder, and the receiving groove 21 is located on the outer cylinder 1 side. The edge 22 is formed at an acute angle.
That is, the configuration of the inner cylinder 2 is the same as that in the above embodiment.
In this embodiment, before inserting the steel pipe A into the joint member B, a nut is inserted from the receiving groove 15 side and the nut 15 is fitted to the nut seat 14.
Then, the bolt 12 is screwed into the nut 15 from the outside.
The action of deforming a part of the steel pipe A by the propulsive force generated by the rotation of the bolt 12 and causing the steel pipe A to bulge toward the receiving groove 21 is the same as in the above-described embodiment.
In this way, the steel pipe is obtained by using the inexpensive commercial nut 15 fitted to the nut seat 14 to remove the thrust force of the bolt 12 without threading the screw hole 11 into the outer cylinder 1 or welding the nut. A can be deformed and connected.

<11> Other embodiment 2. (Fig. 6)
In this embodiment, the outer cylinder 1 is not provided with the screw hole 11, and the nut seat 14 is not provided, and only the through hole 13 is formed.
In the inner cylinder 2, a receiving groove 21 is formed at a position corresponding to the through hole 13, and an edge 22 on the outer cylinder 1 side of the receiving groove 21 is formed at an acute angle.
On the other hand, a reaction force ring 4 that can be fitted to the outside of the outer cylinder 1 is used.
This reaction force ring 4 is a steel short cylinder having a certain thickness and width, and its inner diameter is formed to be substantially equal to the outer diameter of the outer cylinder 1 so that it can be easily fitted to the outer periphery of the outer cylinder 1. Configure.
Then, the reaction force ring 4 can be fitted in a state in which the belt is wound around the outer periphery of the outer cylinder 1.
The reaction force ring 4 is provided with an insertion hole 41 at a position corresponding to the through hole 13 when the reaction force ring 4 is fitted to the outside of the outer cylinder 1.
The insertion hole 41 is a hole having an inner diameter that is larger than the diameter of the bolt 12 but smaller than the outer diameter of the nut 15, and the insertion hole 41 passes through the reaction force ring 4.
The diameter of the through hole 13 of the outer cylinder 1 is formed to a size that allows a commercially available nut 15 to be inserted.
When connecting the steel pipe A, the reaction ring 4 is fitted to the outer periphery of the outer cylinder 1, and the end of the steel pipe A is inserted into the gap between the outer cylinder 1 and the inner cylinder 2.
Then, the nut 15 is set in the through hole 13 of the outer cylinder 1 so that the position of the insertion hole 41 of the reaction force ring 4 matches the position of the through hole 13 of the outer cylinder 1.
Then, the bolt 12 is inserted into the insertion hole 41.
The bolt 12 passes through the insertion hole 41 of the reaction force ring 4 and is screwed into the nut 15 accommodated in the through hole 13.
The propulsive force of the bolt 12 pressurizes the steel pipe A to bulge into the receiving groove 21, and the function of the horizontal edge 22 and the vertical edge 22 biting into the bulging portion is the same as in the other embodiments. It is.
Thus, without forming a screw hole in either the outer cylinder 1 or the reaction force ring 4, a commercially available nut 15 is fitted into the through hole 13, and the reaction force of the driving force of the bolt 12 is increased. The steel pipe A can be deformed and connected.

<12> Other Example 3. (Fig. 7)
When a rotational force is applied to the steel pipe A, an engagement piece 17 as a key is welded to the outer periphery of the upper portion of the steel pipe A, and the rotational force is transmitted using the engagement piece 17 as a clue.
When such an insertion method is employed, a notch 16 is formed at the lower end of the outer cylinder 1 of the joint B in accordance with the position and shape of the engagement piece 17.
Then, when the joint B is inserted into the upper end of the steel pipe A already installed in the ground, the notch 16 of the joint B fitted from above is fitted into the engagement piece 17 of the steel pipe A and inserted, The rotation of the upper steel pipe A can be reliably transmitted to the lower steel pipe A. In parallel with the pressurization of the steel pipe to the receiving groove 21 described above, or only the combination of the notch 16 and the engagement piece 17 is independent. Can be used.

The notch figure of the Example of the coupling member of this invention. Sectional drawing of the principal part of a coupling member. Explanatory drawing of the structure of a receiving groove. Explanatory drawing of the state which pressurized with the volt | bolt and deformed the steel pipe. Explanatory drawing of another Example. Explanatory drawing of another Example. Explanatory drawing of another Example. Explanatory drawing of the operation | work which connects a steel pipe and a steel pipe. Explanatory drawing in the method of connecting between the conventional steel pipes.

Explanation of symbols

A: Steel pipe B: Joint member 1: Outer cylinder 11: Screw hole 14: Nut seat 15: Nut 2: Inner cylinder 21: Receiving groove 22: Edge 3: Connection shelf board 4: Reaction force ring

Claims (3)

A joint member connecting two steel pipes on the same axis,
Consists of a double cylinder in which the inner cylinder is located inside the outer cylinder,
The outer cylinder is provided with a screw hole toward the central axis of the cylinder,
In the inner cylinder, a receiving groove is formed at a position corresponding to the screw hole,
Insert the connecting steel pipe between the outer cylinder and the inner cylinder,
By screwing a bolt into the screw hole, a part of the steel pipe is swollen to the groove side,
Steel pipe joint member. A joint member connecting two steel pipes on the same axis,
Consists of a double cylinder in which the inner cylinder is located inside the outer cylinder,
The outer cylinder is provided with a through hole toward the central axis of the cylinder,
A nut seat for storing the nut is recessed inside the through hole,
In the inner cylinder, a receiving groove is formed at a position corresponding to the nut seat,
Insert the connecting steel pipe between the outer cylinder and the inner cylinder,
By screwing a bolt into the nut seat, a part of the steel pipe is swollen to the groove side,
Steel pipe joint member. A joint member connecting two steel pipes on the same axis,
A double cylinder in which the inner cylinder is positioned inside the outer cylinder;
Consists of a reaction force ring that can be fitted to the outside of the outer cylinder,
The outer cylinder is provided with a through hole toward the central axis of the cylinder,
The reaction ring is provided with an insertion hole at a position corresponding to the through hole when the reaction ring is fitted to the outside of the outer cylinder.
The inner diameter of the through hole is configured to accommodate the nut,
In the inner cylinder, a receiving groove is formed at a position corresponding to the through hole,
Insert the connecting steel pipe between the outer cylinder and the inner cylinder,
By screwing a bolt into the nut of the through hole of the reaction ring, a part of the steel pipe is received and bulged to the groove side.
Steel pipe joint member.

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