JPH10160043A - Pipe manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reasonably manufacture a pipe whose inside is formed with a female joint when a plurality of pipes are engaged with each other to form an embedded pipe roof. SOLUTION: In the inside of a raw pipe 1, a pipe part component member 3 formed out of channel steel, for example, is inserted and a wall part 3a which is a longitudinal direction end part of the member 3 is brought into contact with the inner periphery surface of the raw pipe 1, and the member 3 is disposed in parallel to the axial line of the raw pipe 1. The wall part 3a and the raw pipe 1 are welded to form a closed cross-section 7 by the pipe part component member 3 and the raw pipe 1 on the connection part 3b side of the member 3. A groove 2a is formed by cutting the raw pipe 1 between the wall parts 3a over the length by a prescribed width. The raw pipe 1 is constrained by the pipe part component member 3, and the discharge of residual stress caused by forming the groove 2a is reduced to prevent its deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an advantageous pipe for connecting pipes to construct a pipe roof.

[0002]

2. Description of the Related Art When constructing a tunnel such as a dike where the width is short and both sides in the width direction are low or a tunnel that crosses a road, a plurality of pipes are adapted to a target shape and size at a tunnel construction location. A so-called pipe roof is constructed by arranging them in parallel and buried in connection with each other to support the ground, and a tunnel is constructed by excavating the inside of the pipe roof.

When burying a pipe for constructing a pipe roof, first, a reference pipe is propelled and buried, and then a new pipe is propelled and buried adjacent to the buried reference pipe. By repeating this operation, a predetermined number of pipes are juxtaposed and arranged adjacent to each other, whereby a pipe roof is constructed.

In particular, when a new pipe is propelled adjacent to an already buried pipe, it is not preferable that the mutual burial position be uncontrolled. For this reason, a pair of joints is formed over the entire length of the tube. Then, the joint between the already buried pipe and the new pipe is engaged, so that the joint is used as a guide to maintain the positional relationship between the two.

[0005] Generally, the joint of the pipe is protruded from a predetermined position on the outer periphery of the pipe over the entire length. That is, a male joint formed into a T-shape by, for example, arranging two angle members back to back and welding them at two locations on the outer periphery of a pipe having a predetermined diameter and length, and A female joint formed by welding the angle members with the flanges facing each other with a gap therebetween is provided so as to protrude.

[0006]

In the pipe constructed as described above, the joints protruding from the outer periphery at the time of propulsion become a resistance and require a large thrust, and these joints cut into the ground. There is a problem that rolling may occur in the tube. For this reason, the applicant has filed a utility model registration application by developing a pipe capable of solving the above problems (Japanese Utility Model Publication No. 8-3515).

It is an object of the present invention to provide a method for rationally manufacturing the above pipe.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a pipe manufacturing method according to the present invention is a method for manufacturing a pipe having a female joint therein and used for constructing a pipe roof. A base tube having a predetermined diameter and length, and two longitudinal ends having the same length as the base tube and capable of abutting against the inner peripheral surface of the base tube for forming a female joint. And at least one tube component is disposed inside the tube with its two longitudinal ends along the inner peripheral surface of the tube, and then abuts each other. The two longitudinal ends of the pipe part and the inner peripheral surface of the raw pipe are welded respectively to form a female space surrounded by a part of the pipe part and the inner peripheral surface of the raw pipe. A groove communicating with the female space portion is formed on a peripheral wall of the raw tube to which the pipe part component is attached over the entire length of the raw tube. And in, it is characterized in that to form the female joint by said groove and the female space.

In the method for manufacturing a pipe, a raw pipe having a predetermined diameter and length for constructing a pipe roof is provided.
A tube section component having a longitudinal end is provided to form a female joint, and at least one tube section component is disposed within the tube and both longitudinal ends of the member are positioned within the tube. The female space portion surrounded by a part of the inner peripheral surface of the tube part constituting member and the base tube can be formed by abutting the peripheral portion and welding the contact portion. Further, by cutting a portion corresponding to the female space portion of the raw tube over the entire length, the groove has a closed cross-section in which both sides of the groove are connected via a pipe portion constituting member despite the formation of the groove. And the female joint can be constituted by the groove and the female space.

[0010] In particular, by welding the tube component to the inner peripheral surface of the tube in the first step, the cross-sectional shape is formed by the closed cross section of the tube itself and the peripheral wall of the tube and the tube component. The configured closed section can be formed simultaneously.
And when the raw tube is cut over the entire length in the second step,
A free end exists between the cut site and the longitudinal end of the tube section component, while the other sites maintain a closed cross section. For this reason, even if the stress at the time of pipe production remains in the raw pipe, the influence of this residual stress is limited to the longitudinal end of the pipe part constituting member and the vicinity of the cut portion, and the entire pipe is distorted. Does not occur.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the method for manufacturing a pipe will be described below with reference to the drawings. 1 is a diagram showing a manufacturing process, FIG. 2 is a cross-sectional view in a direction perpendicular to an axis explaining an example of a tube, FIG. 3 is a diagram showing another example of a tube, and FIG. 4 is a diagram showing another example of a tube. It is.

Prior to describing the method of manufacturing a pipe according to the present invention, an example of the configuration of a desired pipe A to F will be described with reference to FIGS.
This will be described below. Each of these pipes A to F is used for constructing a pipe roof (not shown), and prevents the occurrence of rolling by eliminating extreme bias of resistance when propelling underground, and also increases the thrust. This is to prevent it.

A pipe A shown in FIG. 2 is a pipe 1 having a predetermined diameter, wall thickness and length, and a pipe having a predetermined cross-sectional shape and length which is welded to the inner peripheral surface of the pipe 1. The female joint 2 is configured to include a pipe portion constituting member 3 and a male joint 4 projecting from the outer peripheral surface of the raw tube 1 and engaging with the female joint 3.

The raw pipe 1 is made of a steel pipe, and specifications such as a diameter and a wall thickness of the raw pipe 1 are set in accordance with conditions such as a length of a pipe roof to be constructed and an acting earth pressure. Usually, the pipe used for the pipe roof is a large-diameter pipe, and is generally manufactured by twisting or bending a plate material. For this reason, a relatively high stress often remains in the raw tube 1.

The female joint 2 is formed on the inner peripheral surface side of the raw tube 1 so that no extra resistance occurs when the tube A is propelled underground. After the pipe A is buried,
When the new pipe A is propelled adjacent to this pipe A, the male joint 4 protruding from the new pipe A is engaged so as to maintain a relative position with each other. For this reason, the female joint 2 is formed to have a shape capable of fitting the male joint 4, and in particular, a groove 2 a is formed in a portion of the raw tube 1 constituting the female joint 2.

The female joint 2 is not necessarily limited to only one place. For example, the pipe D shown in FIG. 4A is provided with two female joints 2. This pipe D is propelled first and buried underground when constructing a pipe roof. Thus, the female joint 2 is formed in at least one place in the pipe A.

The tube part constituting member 3 is welded to the inner peripheral surface of the tube 1 to form a female space with the tube 1, and further forms a groove 2a in the tube 1 corresponding to the female space. Thus, the female joint 2 is formed, and has a wall portion 3a which is two longitudinal ends to be welded in contact with the inner peripheral surface of the raw tube 1. The wall portion 3a does not necessarily need to be formed in a clear wall shape, but may have any shape as long as it can be welded to the inner peripheral surface of the raw tube 1.

The pipe part constituting member 3 is not only welded to the raw pipe 1 to form the female joint 2 together with the raw pipe 1,
To prevent the deformation due to the release of the residual stress due to the formation of the groove 2a. For this reason, it is necessary that the cross section of the tube part constituting member 3 has a continuous shape.

In the pipe A according to this embodiment, as shown in FIG. 2, a channel steel having a pair of wall parts 3a made of a flange and a connecting part 3b made of a web is used as the pipe part constituting member 3. ing. In the pipe B shown in FIG. 3A, a steel pipe obtained by cutting a steel pipe such as a structural steel pipe or a high-pressure pipe steel pipe into a C-shape is used, and both end portions of the C-shape function as the wall 3a. Another part functions as the connection part 3b. Further, in the pipe C shown in FIG. 4B, a flat bar is used as the pipe part constituting member 3, and both ends of the flat bar are used as the wall portions 3a, and the other portions are connected portions 3b.
Function. The tube E shown in FIG.
A steel material formed into an R-shape is used as the pipe part constituting member 3, and is substantially similar to the configuration of the channel steel in the pipe A.
Therefore, it has a flange-shaped wall portion 3a formed on the tube portion constituting member 3.

In each of the pipes A to E, a female joint 2 and a male joint 4
Are formed at positions facing each other. However, each joint 2,
The relative positions of the four do not necessarily need to be 180 degrees opposite to each other, but are 90 degrees apart from each other, as in a tube F shown in FIG.
It may have degrees or other angles.

The male joint 4 is the female joint 2 of the pipe A already buried.
The propulsion is carried out by fitting into the propulsion unit, the propulsion direction is guided, and the relative position between the two is maintained. For this reason, male joint 4
Can be easily fitted and guided in the female joint 2 by T
It is constituted by a T-shaped steel member or by combining two angle members with the backs of the flanges facing each other. In any case, the male joint 4 is
Is welded over the entire length at a predetermined position.

The position of the male joint 4 is set based on the female joint 2 in accordance with the position of the pipe on the pipe roof. That is, when the pipe A is applied to the ceiling or the side wall of the pipe roof, the female joint 2 and the male joint 4 in the pipe A are formed to have a diameter passing through the center of the raw pipe 1. When the pipe is applied to the intersection between the ceiling and the side wall, the male joint 4 is formed at a position having an angle of 90 degrees with respect to the female joint 2 as in a pipe F shown in FIG. You. Further, when the ceiling of the pipe roof is an arch, the male joint 4 is formed at a position having an angle with respect to the female joint 2 according to the arc of the arch.

Next, a method of manufacturing the pipe A will be described with reference to FIG. First, as shown in FIG. 1 (a), the pipe part forming member 3 is inserted into the pipe 1 and the pipe part forming 3 is arranged along the longitudinal direction of the raw tube 1. At this time, it is necessary to arrange the axial center of the raw tube 1 and the longitudinal direction of the tube portion constituting member 3 so as to be exactly parallel.

For example, when the tube part constituting member 3 is bent with respect to the axis of the raw tube 1, the tube a
After the male joint 4 of the new pipe A is fitted and fitted to the female joint 2 of the pipe A,
May come into contact with the wall portion 3a of the pipe portion constituting member 3 constituting the female joint 2 and may not be able to perform effective propulsion.
Therefore, it is preferable to insert the tube part constituting member 3 into the inside of the raw tube 1 and arrange it parallel to the axis of the raw tube 1 and then temporarily attach it to the wall 3a and the inner peripheral surface immediately.

After arranging the tube portion constituting member 3 in parallel with the axis of the tube 1, the wall 3a and the inner peripheral surface of the tube 1 are welded as shown in FIG. When welding the wall 3a and the inner peripheral surface of the raw tube 1, the welding method and apparatus are not particularly limited, but a bogie 6 equipped with a torch 5 such as a carbon dioxide welding torch or a submerged welding torch is used. Automatic welding is preferred.

When the pipe member 3 is welded to the inner peripheral surface of the pipe 1 as described above, the cross section of the pipe 1 includes a closed cross section of the pipe 1 itself and a wall of the pipe part 3. A closed cross section formed by the member 3 and a part of the raw tube 1 is formed between the portions 3a, and a closed cross section 7 formed by the member 3 and a large part of the raw tube 1 is formed in the connecting portion 3b of the tube part constituting member 3.

At the same time as or before or after the welding of the tube portion constituting member 3 to the raw tube 1, a male joint 4 is welded to a predetermined position on the outer periphery of the raw tube 1 as shown in FIG. However, when the target pipe A has two female joints 2 provided, the male joint 4 is not provided on the outer periphery of the raw tube 1.

Next, as shown in FIG. 1D, the raw tube 1 between the wall portions 3a, which are both ends in the longitudinal direction, of the tube portion constituting member 3.
Is cut along the entire length and at a predetermined size to form a groove 2.
a is formed. When cutting the raw tube 1, the cutting method is not limited, but two torches 8, such as a torch with a gas cutting crater or a plasma cutting torch, are mounted on a bogie (not shown) and a predetermined interval is set. It is preferable that the cart is moved and cut in this state.

When the torch 8 is driven to cut the raw tube 1 over its entire length, the cutting releases the stress remaining in the raw tube 1, which may cause the raw tube 1 to be distorted. However, since the tube portion constituting member 3 is welded to the tube 1, a closed cross section 7 including the tube 1, the wall 3 a, and the connecting portion 3 b is formed. It is restrained by the member 3. Therefore, even if a part of the raw tube 1 located between the wall 3a and the groove 2a is a free end and is distorted, distortion is generated in most of the raw tube 1 forming the closed cross section 7. Absent.

The tube part constituting member 3 has a function of restraining the raw tube 1 and restraining deformation due to residual stress released when the raw tube 1 is cut along the entire length thereof. For this reason, a force in the direction of expanding or contracting the wall portion 3a acts on the tube portion constituting member 3, and accordingly, a bending force acts on the connecting portion 3b. Therefore, it is necessary that the tube portion constituting member 3 has strength enough to withstand the above-mentioned force. For this reason, in the embodiment shown in FIG. 2, the web serving as the connection portion 3b is reinforced by the reinforcing plate 9.

In order to reduce the distortion caused by the release of residual stress in the raw tube 1, uncut portions are left at regular intervals when the raw tube 1 is cut, and the temperature of the raw tube 1 is lowered. Thereafter, it is preferable to cut the uncut portion. By cutting in this manner, it is possible to reduce distortion generated in the raw tube 1.

[0032]

As described above in detail, in the method of manufacturing a pipe according to the present invention, first, the inner peripheral surface of the raw pipe is brought into contact with the wall, which is the longitudinal end of the pipe part constituting member, by welding. By doing so, a closed cross section can be constituted by the tube part constituting member and the base tube. In this state, the stress remaining in the tube is not released, and no distortion occurs in the tube. Thereafter, by cutting a portion corresponding to the female space formed between the tube portion constituent members of the raw tube over the entire length to form a groove, a female joint can be formed by the tube portion constituent member and the groove. . Further, even when the tube is distorted due to the cutting, the tube is restrained by the tube portion constituting member, so that no deformation occurs.

Therefore, a pipe having a female joint therein can be manufactured with high precision. Therefore, smooth propulsion can be performed by using the tube manufactured by the method according to the present invention, and the positional accuracy of the propelled tube can be improved.

[Brief description of the drawings]

FIG. 1 is a view showing a manufacturing process.

FIG. 2 is a cross-sectional view in a direction perpendicular to an axis center illustrating an example of a pipe.

FIG. 3 is a view showing another example of a pipe.

FIG. 4 is a view showing another example of a pipe.

[Explanation of symbols]

 A to C pipe 1 raw pipe 2 female joint 2a groove 3 pipe partial constituent member 3a wall 3b connecting part 4 male joint 5,8 torch 6 bogie 7 closed section 9 reinforcing plate

Claims (4)

[Claims] 1. A method for manufacturing a pipe having a female joint therein and used for constructing a pipe roof, comprising: a raw pipe having a predetermined diameter and length; and a female joint. A tube part having the same length as the base tube and having two longitudinal ends capable of abutting against the inner peripheral surface of the base tube, wherein at least one tube part is provided inside the base tube. The component member is disposed with both longitudinal ends thereof along the inner peripheral surface of the raw tube, and then, the two longitudinal ends of the tube part component and the inner peripheral surface of the raw tube that are in contact with each other are welded, respectively. Forming a female space part surrounded by the pipe part constituent member and a part of the inner peripheral surface of the raw pipe, and thereafter, a groove communicating with the female space part on a peripheral wall of the raw pipe to which the pipe part constituent member is attached. By forming the female joint over the entire length of the raw tube, thereby forming a female joint by the groove and the female space portion. Manufacturing method. 2. The method according to claim 1, wherein the pipe part constituting member is a channel steel. 3. The method according to claim 1, wherein the tube component member is a member formed into an R shape. 4. The method according to claim 1, wherein the tube part constituting member is a flat bar.