JPS6123436B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for centering a pipe body in an existing pipe piping method.

When replacing an aging existing pipe with a new pipe, a ductile straight pipe is used as the new pipe, and a curved pipe 6 is formed between pipes 1' and 1'' as shown in Figure 1. This pipe line 6 is placed inside the pipe line 6 of the existing pipe line 1.
A steel bent pipe 7 having a bending degree corresponding to the above and having a short length is inserted and installed, and then a jack 4 is installed in one of the shafts 2 and 3 provided at both ends of the pipe line 1 or as shown in the figure. Using a winch or the like, insert the steel straight pipe 9 with a socket at the rear end into the front end, then insert the ductile straight pipe 5, and insert the subsequent ductile straight pipe 5 into the socket of the steel pipe 9. Then, the same process is repeated to sequentially join the ductile straight pipes and insert them into the conduit 1', and when the tip of the steel pipe 9 comes into contact with the end of the steel pipe 7,
The method of joining the abutting portions by welding is known as the existing pipe piping method.

By the way, in such a construction method, when joining the steel pipes 7 and 9, it is necessary to perform centering work on both pipes, but conventionally, such work is carried out using a steel plate support stand attached to the inner surfaces of the opposing ends of the steel pipes 7 and 9. Wedge 11 in 10
(FIG. 2), or in the case of a steel pipe 7' whose end is formed in a socket, a telescopic support 12 is provided in the socket and this support is actuated.

However, in the former case, at least four support stands 10 must be provided on the top, bottom, left and right sides of the steel pipes 7 and 9, and the wedges 11 must be driven into each of these, making the work complicated. Although alignment is possible, it is difficult to align the left and right sides, the alignment accuracy is poor, and since the support 12 is located within the socket, it is difficult to join after alignment.

It is an object of the present invention to provide a centering method that eliminates the drawbacks of the conventional methods and allows centering operations to be performed accurately, quickly, and with high precision.

In order to achieve the above object, the centering method according to the present invention uses vertically oriented centering methods in the opposite ends of a first new pipe installed in a curved pipe formed in the middle of an existing pipe in the above-mentioned piping construction method. a telescopic support member fixed to the support member; one end of the support member is pivotally supported by a removable first pivot pin at the lower part of the support member; and the other end protrudes outward from the opposite end of the first new pipe. a swinging member, one end of which is pivoted to the other end of the swinging member by a detachable second pivot pin, and the other end pivoted to the upper part of the support member by a detachable third pivot pin; a first pivot pin that is supported and swings the swinging member about the first pivot pin;
an actuating member; and a second actuating member that is attached to an intermediate portion of the swinging member so as to be able to pivot therearound and whose tip can press the inner surface of the first new pipe, the second actuating member protruding outward from the swinging member. The opposite end of the second new pipe is supported by the opposite end of the second new pipe, and then the first actuating member is actuated to move the second new pipe in the vertical direction to perform vertical centering with respect to the first new pipe. By activating the second actuating member and pressing the inner surface of the first new pipe with its tip, this pressing reaction force is applied to the swinging member, and the second new pipe is moved in the left-right direction and moved against the first new pipe. It is characterized by performing left and right centering. As described above, according to the method of the present invention, it is possible to accurately and quickly perform vertical and horizontal centering of a new pipe to be joined within an existing pipe, and in addition to vertical centering, it is also possible to perform horizontal centering. This increases centering accuracy. Furthermore, the above-mentioned centering allows the two new pipes to be easily joined, making piping work extremely efficient.

This invention has the following unique effects. That is, the supporting member, the fixing member, the first operating member, and the second and third operating members are each removable by the first to third pivot pins, and are inserted into the new pipe from the existing pipe. Since it is assembled and fixed, transportation is convenient and workability is high. Further, the joining of the two new pipes can be easily carried out by pressing the centering together after centering. Furthermore, since the support member is expandable, even when installing a new pipe with a different diameter within an existing pipeline, it can be easily fixed by adjusting the amount of expansion and contraction. It has various advantages such as being able to accommodate new diameter pipes.

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 4 and 5, 21 is a telescopic column, 23 has one end pivoted to the lower end of the column 21,
and a swinging member provided with a guide roller 22 at the other end;
Reference numeral 24 designates a telescopic operating arm that connects the upper end of the support column 21 and the swinging member 23, and by operating this arm 24, the swinging member 23 swings about the pivot point. There is. Reference numeral 25 denotes a telescoping operating arm attached to the middle part of the swinging member 23 so as to be able to slide freely in the axial direction of the swinging member 23 and swing freely around the shaft.
It faces toward the first side and can press the inner surface of the steel pipe 7. 26, 27, 28, 29 are pivot pins,
It is loosely attached to the pivoting centering members 21, 23, 24, and 25 with some play, and each of the members can be disassembled by removing these pins. In order to center the steel pipes 7 and 9, first, the above-mentioned members are disassembled and carried into the end of the steel pipe 7, and after fixing the strut 21 to the steel pipe 7, the pins 26, 27, 28, 29
Via the swinging member 23, the actuating arms 24 and 25
are assembled so that the guide roller 22 of the swinging member 23 projects outwardly from the end of the tube 7. Next, after supporting the inner surface of the steel pipes 9 to be joined by the guide rollers 22 of the swinging member 23, the operating arm 24 is actuated to swing the swinging member 23 upward to pull and lift the steel pipe 9. , vertically center the steel pipe 7. At this time, this operating arm 2
As shown in FIG. Measure the dimension b with a straight scale, and calculate this dimensional difference b-a=c in advance.

After performing vertical centering in this way, left and right centering is performed this time, but in this case, the steel pipe 7 on the eccentric side of the steel pipe 9 that is eccentric in either the left or right direction with respect to the steel pipe 7 is The operating arm 25 is slid and rotated so that its tip is located at the center of the inner surface. When the actuating arm 25 is actuated and its tip presses against the inner surface of the steel pipe 7, this pressing reaction force is applied to the swinging member 23, and the swinging member 23 moves to its lower end pivot pin 2.
Since 6 has play, the upper part is displaced from the position shown by the chain line in FIG. 5 through this play,
Eventually, the steel pipe 9 is moved in the lateral direction, and the left and right centering of the steel pipe 7 is performed.

After performing vertical and horizontal centering as described above,
The steel pipe 9 is pushed forward with the jack 4 by the following ductile straight pipe 5, and its end is brought into contact with the end of the steel pipe 7, and the joint is welded. After joining, the centering member is again disassembled within the pipe line 6 and carried out of the existing pipe line 1.

FIG. 6 shows another embodiment in which a steel pipe 7' having a socket 32 with an annular packing 31 at the end is installed in the conduit 6 instead of a steel pipe 7 without a socket. The dispensing method is the same as in the previous embodiment. After centering, in this case, since the strut 21 is not provided in the socket 32, pushing and joining the steel pipe 7' of the steel pipe 9 into the socket 32 is very easy.

Incidentally, in the above embodiment, the support column 21 is shown as a member to which the swinging member 23 is attached, but it goes without saying that this is only one example and is not limited to this. Although the actuation arm 24 is shown as a member for swinging the swinging member 23 and the actuation arm 25 is shown as a member for pressing the inner surface of the steel pipe 7, other members may be used as long as they have the same function, and the swinging member Various design changes are possible, such as not necessarily requiring the guide roller 22 attached to the guide roller 23. In addition, in the above embodiment, the steel pipe 7 is used as the new pipe to be joined.
Although 7' and 9 are shown above, a ductile straight pipe 5 may be used instead of the steel pipe 9, or a steel pipe 7,
7', 9, the steel pipe 9 may be a ductile straight pipe 5, and the other steel pipes 7, 7' may be ductile bent pipes.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of a conventional piping method in existing pipes, Figs. 2 and 3 are a longitudinal sectional front view showing an example of the centering method in the above, and Fig. 4 is a longitudinal sectional front view of an embodiment of the present invention. 5 is a longitudinal sectional side view of the steel pipe 9 taken along the line - in FIG. 4, and FIG. 6 is a longitudinal sectional front view showing another embodiment of the present invention. 1, 1', 1''...Existing pipe line, 6...Curved pipe line,
7, 7'...Steel bent pipe, 9...Steel straight pipe, 21...
... Support column, 22 ... Guide roller, 23 ... Swinging member, 24, 25 ... Operating arm, 26, 27, 2
8, 29... Pivot pin, 31... Annular packing,
32...Socket.

Claims (1)

[Claims] 1. A vertical shaft with openings on the sides of the existing pipe is provided at both ends of the pipe, a first new pipe is installed in a curved pipe formed in the middle of this pipe, and the first new pipe is installed at the end of the new pipe with the shafts of both the above-mentioned shafts. The second pipe is inserted into the existing pipe from either one of the holes.
In a piping construction method in which opposite ends of a new pipe are connected and installed, a telescopic support member is fixed vertically within the opposite end of the first new pipe, and one end is detachably attached to the lower part of the support member. Pivotally supported by a free first pivot pin,
and a swinging member whose other end protrudes outward from the opposite end of the first new pipe; one end of the swinging member is pivoted to the other end of the swinging member by a detachable second pivot pin; is pivotally supported on the upper part of the support member by a third removable pivot pin, and a first actuating member that pivots the swinging member about the first pivot pin; a second actuating member that is rotatably mounted around the second new pipe and whose tip can press the inner surface of the first new pipe; The first actuating member is then actuated to move the second new tube in the vertical direction to vertically center it with respect to the first new tube, and then the second actuating member is actuated to move the second new tube in the vertical direction. By pressing the inner surface of the tube, this pressing reaction force is applied to the swinging member, and the second
A method for centering a pipe body in an existing pipe piping construction method, which is characterized by moving the new pipe in the left-right direction to perform left-right centering with respect to a first new pipe.