JPH1034384A - Guide member for membrane welding machine of underground lng storage tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide even a LNG storage tank different in diameter with interchangeability and to easily deal with even the difference of depth. SOLUTION: In this guide frame 10, both side longitudinal frames 21 are connected with plural numbers of lateral frames 22, a guide rail 30 on which a welding machine is moved and guided is movably provided on a guide tube 25 installed parallel with the lateral frame 22, and respective lengths of the lateral frame 22 and the guide tube 22 are adjustable. Therefore, the width of the guide frame 10 is made variable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide member for moving and guiding a welding machine for welding a joint along a vertical joint of a membrane provided on an inner peripheral surface of an underground LNG storage tank.

[0002]

2. Description of the Related Art In an underground LNG storage tank, a stainless steel membrane is provided on the inner peripheral surface thereof.

[0003] As shown in a perspective view of FIG.
0 is formed in rectangular blocks 71 and 72 of a predetermined size, transported to the site, joined by welding and installed on the inner surface of the tank. The convex bending portion indicated by 70A in the figure is a corrugation for absorbing expansion and contraction due to a temperature difference.

[0004] As an arrangement structure, there is a structure in which a flat plate-like block 71 and a bent block 72 are alternately joined in the circumferential direction as shown in the figure to form a cylindrical shape along the inner surface of the LNG storage tank as a whole. . That is, this structure is microscopically configured as a polygon. In this case, when configuring tanks having different sizes (diameters), it is possible to cope by changing the width of the flat block 71.

[0005] The joining of the blocks 71 and 72 of the membrane 70 is performed by an automatic welding machine. In the vertical welding (welding of the side edges of the block indicated by Z in FIG. 8), a guide frame 80 having a guide rail 81 is disposed at the center of the flat plate-shaped block 71 as shown in a horizontal sectional view of FIG. And
The welding is performed while moving the welding machine 50 vertically (along the side edge of the block 71) along the guide rail 81.

[0006] The guide rail 81 is provided with a guide frame 80.
Can be moved left and right with respect to each other, and the welding operation on the corresponding side is performed while being positioned at each side end (the welding machine 50 turns and reverses).

In the configuration in which the guide rail 81 for guiding the movement of the welding machine 50 moves left and right with respect to the guide frame 80 as described above, the guide frame 80 is disposed at the center of the flat block 71 in the width direction. Both edges of the flat block 71 can be welded without moving the guide frame 80 left and right.

[0008]

By the way, in the configuration in which the membrane 70 is arranged in a polygonal shape, the width of the flat block 71 is changed as described above for the difference in the size (diameter) of the LNG storage tank. However, as a matter of course, the distance from the center of the plate-shaped block 71 to the side edge thereof is different.

The welding position: Z from the guide frame 80 of the automatic welding machine arranged at the center of the flat block 71.
The guide frame 80 was not compatible with tanks of different diameters.

[0010] In addition, not only in the radial direction but also in the depth direction, it has been manufactured as a dedicated product having a length corresponding to the depth of the tank.

In most cases, the underground LNG storage tanks cannot be shared with the guide frame because the specifications are different from one another. Therefore, a dedicated guide frame corresponding to the size of each tank is newly provided each time. It had to be produced, and had the problem of being extremely irrational and costly.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has compatibility with LNG storage tanks having different diameters and easily copes with differences in depth. It is an object of the present invention to provide a guide member for a membrane welding machine for an underground LNG storage tank, which can save resources and reduce costs.

[0013]

According to the present invention, a guide member structure for a membrane welding machine for an underground LNG storage tank according to the present invention, which achieves the above object, is provided in a longitudinal direction of a membrane provided on an inner peripheral surface of the underground LNG storage tank. Along the joint, to guide the movement of the welding machine for welding the joint,
A horizontal guide member is provided in parallel with the horizontal frame member on a frame member formed by connecting the vertical frame members on both sides with a plurality of horizontal frame members, and a guide for moving and guiding the welding machine to the horizontal guide member. A rail member is movably supported, the horizontal frame member and the horizontal guide member are each adjustable in length, and the width of the frame member and the amount of movement of the guide rail member are variable. It is characterized by having been done.

Further, the guide member includes a plurality of unit guide members each having a predetermined length, each of which is constituted by a frame member and a guide rail member supported by the frame member. The combination is characterized in that the entire length can be set in correspondence with the construction target site.

Further, by connecting the vertical frame members via a connecting member, a plurality of sets of the guide members are connected in series to have a predetermined length corresponding to a site to be worked as a whole, and Are characterized by being configured to be independently movable.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an underground LN according to the present invention.
It is a front view which shows the whole guide structure as an example of the guide member of the membrane welding machine of a G storage tank.

The illustrated guide structure 1 has a first guide 1A and a second guide 1B as guide members of a predetermined length, respectively.
Are connected in series by the connecting member 1C and have a length corresponding to the depth of the LNG storage tank to be constructed, and the upper end of the upper first guide 1A is the upper edge of the side wall of the LNG storage tank. 2 and is fixed at a position corresponding to the center of a plate-shaped membrane (not shown) by a provided vacuum pad, as shown in FIG. 2, which is a cross-sectional view taken along line AA of FIG. The membrane welding machine, which is an automatic welding machine attached to the tub, performs welding while moving along the guide rail. The guide rails of the two guides 1A and 1B are not connected, and can move left and right independently.

As described above, since the first guide 1A and the second guide 1B are connected in series, a welding machine is attached to each of the guides 1A and 1B to perform welding independently. Therefore, a reasonable welding operation can be performed. In this configuration example, two sets of guides (first guide 1A and second guide 1B) are connected, but three or more sets of guides may be connected.

Next, each part will be described in detail. Since the first guide 1A and the second guide 1B have the same configuration, the first guide 1A will be described as the guide 10 and the other description will be omitted.

The guide 10 is shown in a front view in FIG.
As shown in the side view of FIG. 2B, a guide rail 30 is provided on the guide frame 20 so as to be movable in the width direction thereof.

The guide frame 20 is composed of a pair of left and right vertical frames 21 formed by rectangular pipes having a rectangular cross section.
21 (the vertical frame 21 on the left side in the figure overlaps the guide rail 30) is connected in parallel at predetermined intervals by a plurality of horizontal frames 22 arranged at predetermined intervals in the longitudinal direction, forming a so-called ladder shape. Present. A horizontal frame 22 is located at an end in the longitudinal direction, and hanging engagement portions 23 are protrudingly provided at both sides and a center of the outer end.

Each of the horizontal frames 22 is provided with a vacuum pad 24 on the side facing the inner surface (membrane 2) of the storage tank for adsorbing the membrane 2 and fixing the guide 10. Also, a predetermined horizontal frame 22
4A, which is an enlarged cross-sectional view taken along the line BB of FIG. 3, and the line CC of FIG.
As shown in the sectional view of FIG.
A pipe rail 25 is provided in parallel with the horizontal frame 22 as a horizontal guide member that guides and supports the zero.

As shown in the enlarged front view of the relevant portion in FIG.
Reference numeral 21 designates a fitting cylindrical portion 22 of a predetermined length made of a square pipe.
A is welded and fixed in an orthogonal state, and both ends of the joining plate 22B are fitted into the fitting cylindrical portions 22A on both sides thereof, and are fastened by fixing bolts 22C.
That is, the joining plate 22B couples the left and right vertical frames 21 and 21 together.

In the joining plate 22B, a plurality of screw holes 22E corresponding to the fastening screw holes 22D formed in the fitting cylindrical portion 22A are formed in the longitudinal direction at a pitch equal to the fastening screw holes 22D.

In the horizontal frame 22 having such a configuration, the screw hole 22E into which the fixing bolt 22C is screwed is changed by adjusting the amount of fitting of the joining plate 22B to the fitting cylindrical portion 22A, thereby obtaining the structure shown in FIG. ), You can change its length,
Thereby, the interval between the vertical frames 21 and 21 can be changed.

As shown in FIG. 4A, the pipe rail 25 is connected to the fitting cylindrical portion 22 of the horizontal frame 22 via a collar 26.
A and is provided in parallel with a predetermined interval from the outer surface of the horizontal frame 22. Also, as shown in FIG. 6A corresponding to the DD cross-sectional view of FIG. 3, the horizontal frame 22 is divided at substantially the center in the longitudinal direction so as to be fitted and continued in the shortest state. When the 22 is extended, it can be dealt with by extending the collar 25A between the divided portions separated as shown in FIG. 6B.

The guide rail 30 has a rectangular pipe shape with a rectangular cross section as shown in FIG.
A rack ridge 31 for engaging and moving the drive mechanism of the welding machine 50 is provided to project along the longitudinal direction, and V-shaped guide grooves are provided on both side surfaces with which a moving roller of the welding machine is engaged. Have been. The length is set to be longer than the vertical frame 21 of the guide frame 20 by a predetermined amount.

At a position corresponding to the pipe rail 25, an engagement moving mechanism 40 shown in FIG. 4 is provided, and the guide rail 30 is moved by the engagement movement mechanism 40 to the pipe rail 25 (that is, the guide frame 20). It is mounted so that it can be moved.

The engagement moving mechanism 40 is composed of three moving pulleys 41, 42, 43 each having a V-groove formed on the outer periphery thereof so as to sandwich the pipe rail 25. That is, the two moving pulleys 41 and 42 are connected to the pipe rail 25.
Are arranged side by side, and another moving pulley 43 is disposed so as to oppose them and sandwich the pipe rail 25. Such an engagement moving mechanism 4
0 are respectively provided at positions corresponding to the pipe frame 25, but the engagement moving mechanisms 4 located at both upper and lower ends.
4 (A) and (B), the two moving pulleys 41 and 42 are driven to rotate by the driving motor 44, and the upper and lower ends of the pulleys 0 and 40D are engaged with each other. The movable pulleys 41 and 42 are rotationally driven by the synchronous drive of the drive motor 44 of the mechanism 40, whereby the guide rail 30 is driven to move along the pipe rail 25.

Thus, the guide 1 constructed as described above
0 is set to L by the vacuum pad 24 as described above.
A welding machine 50 disposed on the inner surface of the NG storage tank at a position corresponding to the center in the width direction of the flat membrane 2 and attached to the guide rail 30 moves along the guide rail 30 to move both ends of the flat membrane 2. Perform edge welding.
That is, as shown in FIG. 2, in a state where the guide rail 30 is located at one end of the guide frame 20, the torch 51 of the welding machine 50 is welded to the outside welding position on the side where the guide rail 30 is located: X (flat plate). (The side edge position of the membrane) and move along the guide rails 30 to perform the welding operation. Then, the guide rails 30 are moved to the other side of the guide frame 20 and the welding machine 50 is turned over. The welding operation of the welding position is performed. By locating the guide 12 at the center of the plate-shaped membrane in this way, the side edges of the plate-shaped membrane 2 are equidistant in the left and right directions without repositioning the guide 10 by moving the guide rail 30 and reversing the welding machine 50. Can be welded.

If the width of the flat membrane 2 is different due to the different diameter of the LNG storage tank, the horizontal frame 22
By changing the length, the width of the entire guide frame 20 can be changed. That is, the length of the horizontal frame 22 is changed by adjusting the fitting amount of the joining plate 22B to the fitting cylindrical portion 22A and changing the screw holes 22E into which the fixing bolts 22C are screwed, thereby tightening the pipe guide. 25, the collar 25A is sandwiched, and the guide 1
0 is arranged corresponding to the center in the width direction of the flat membrane, and the vertical frame 21 is moved from the welding position: X to the welding machine 5.
The interval between the vertical frames 21 is changed so that 0 is a compatible distance. As a result, the welding operation can be performed in exactly the same manner as in the above-described case, and therefore, the width (diameter) of the flat membrane 2 is different.
The present invention can easily cope with an LNG storage tank.

The guide 10 has a predetermined length formed by connecting a plurality of unit guides 10A and 10B in series, and LNs having different depths depending on the combination.
It can easily cope with the G storage tank. In this configuration example, two intermediate unit guides 10B are sandwiched and connected between two end unit guides 10A.

The end unit guide 10A is provided with three horizontal frames 22. The guide rail 30 is set such that the outer end side is longer than the vertical frame 21 by a predetermined amount, and the connection end side is aligned with the vertical frame 21.

The intermediate unit guide is provided with one horizontal frame 22 at the center in the longitudinal direction, and the guide rail 3
0 is set to the same length as the vertical frame 21.

The connection between the unit guides 10A and 10B is shown in FIG.
As shown in FIG. 7A which is an enlarged view of the Y portion of FIG. 7A and FIG.
Bolts that connect the vertical frame 21 and the connection plate 11 in a state where both ends of the connection plate 11 are fitted to the open ends of the vertical frames 21 and 21 of the A and 10B, respectively, and the opposite end surfaces of the vertical frame 21 are in contact with each other. 12 is performed. Although not shown, the connection of the guide rail 30 is also performed by fastening a connection plate fitted to the opening end.

As described above, the plurality of unit guides 10A, 10A
By connecting B and forming one guide 10,
LNG with different depth by easily changing the length of guide 10
It can also be used for storage tanks.

[0037]

As described above, according to the guide member of the membrane welding machine for the underground LNG storage tank according to the present invention, the horizontal frame member connecting the vertical frame member and the guide rail member of the welding machine are guided. By each horizontal guide member being configured to be adjustable in length,
The entire width can be changed to correspond to membranes having different widths, and it is possible to easily cope with LNG storage tanks having different diameters due to different diameters. Therefore, it is compatible with LNG storage tanks having different diameters, so that it is possible to save the trouble of newly producing or modifying an existing product each time, thereby saving resources and reducing costs. .

Further, the guide member is configured such that a plurality of unit guide members of a predetermined length are connected in series,
By combining the unit guide members, the entire length can be set corresponding to the construction target site, and it is possible to easily cope with LNG storage tanks having different depths.

Further, by connecting the vertical frame members via the connecting members, a plurality of sets of guide members are connected in series to have a predetermined length corresponding to the construction target site as a whole, and guides of each guide member are provided. Since the rail members are configured to be independently movable, welding can be performed independently by attaching a welding machine to each guide member, so that the welding operation can be performed rationally. Things.

[Brief description of the drawings]

FIG. 1 is a front view showing an entire guide structure as an example of a guide member of a membrane welding machine for an underground LNG storage tank according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3A is a front view of a guide, and FIG. 3B is a side view of the guide.

4A is an enlarged sectional view taken along line BB of FIG. 3, and FIG. 4B is a sectional view taken along line CC of FIG.

FIG. 5A is an enlarged front view of a horizontal frame portion, and FIG. 5B is a front view showing a contracted state thereof.

6A is a diagram corresponding to a cross-sectional view taken along line DD of FIG. 3,
(B) is a figure which shows the state in which the guide pipe was extended.

7A is an enlarged view of a portion Y in FIG. 2, and FIG. 7B is a side view thereof.

FIG. 8 is a perspective view showing a membrane.

FIG. 9 is a cross-sectional view showing a conventional membrane welding structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide structure 1A 1st guide (guide member) 1B 2nd guide (guide member) 1C Connecting member 2 Membrane 10 Guide (guide member) 10A End unit guide (unit guide member) 10B Intermediate unit guide (unit guide member) Reference Signs List 20 guide frame (frame member) 21 vertical frame (vertical frame member) 22 horizontal frame (horizontal frame member) 25 guide pipe (horizontal guide member) 30 guide rail (guide rail member) 50 welding machine

Claims (3)

[Claims] 1. A longitudinal frame member on both sides for moving and guiding a welding machine for welding a joint along a longitudinal joint of a membrane provided on an inner peripheral surface of an underground LNG storage tank. A horizontal guide member is provided in parallel with the horizontal frame member on a frame member formed by combining a plurality of horizontal frame members, and a guide rail member for moving and guiding the welding machine to the horizontal guide member is movable. The horizontal frame member and the horizontal guide member are each adjustable in length, and the width of the frame member and the moving amount of the guide rail member are configured to be variable. Characteristic guide member of membrane welding machine for underground LNG storage tank. 2. The unit guide member, wherein a plurality of unit guide members each having a predetermined length, each including a frame member and a guide rail member supported by the frame member, are connected in series. The guide member of a membrane welding machine for an underground LNG storage tank according to claim 1, wherein the length of the guide member is configured to be able to be set corresponding to the construction target site by a combination of the following. 3. When the vertical frame members are connected via a connecting member, a plurality of sets of the guide members are connected in series to have a predetermined length corresponding to a construction target site as a whole, and each of the guide members The guide member for a membrane welding machine for an underground LNG storage tank according to claim 1 or 2, wherein the guide rail members are independently movable.