JPS5827385B2 - Welding assembly method for tank bottom plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention primarily relates to a method and apparatus for assembling the bottom plate of a large storage tank by welding it from both sides.

The conventional method is to first complete the bottom plate assembly by arranging, welding, and inspecting the bottom plate on a pedestal or support, and then suspending the bottom plate from the roof frame or side plate with wires before placing it on the pedestal. Alternatively, the support is removed and the bottom plate is gradually lowered.Secondly, after the bottom plate has been assembled in the same manner as the first method, sealing material is attached to the outer periphery of the bottom plate and the bottom plate is lifted up by near raising. The third method is to dig a groove in the foundation in advance and install the supporting support or pedestal in this groove. Place the bottom plate on the pedestal 1. After completing the assembly of the bottom plate by performing work such as welding and inspection, remove the supporting support in the groove or the pedestal and fill the groove. 4. Place the bottom plate on the pedestal or support. Some devices support the bottom plate with something that melts (for example, ice) after a certain amount of time has passed after assembly is completed, and then the pedestal or support is removed.

In these conventional cases, the first method has the disadvantage that the roof and side panels must be made stronger than necessary, and additional welded parts such as hanging pieces must be attached, while the second method requires the use of air The disadvantage of this method is that it is dangerous because the lifting and lowering of large, heavy objects is carried out by pressure operation.The third method has the disadvantage that it is not easy to backfill the trench and is time-consuming and uneconomical. However, it is difficult to secure the melted material, and when ice is used, for example, there is a problem in disposing of the water generated by the melting, making it impractical.

The present invention aims to provide a method and apparatus for welding and assembling a tank bottom plate, which eliminates the drawbacks of the conventional method, and is particularly suitable for the bottom plate of the inner shell of a double-shell bottom temperature tank.

The configuration of the present invention will be described by way of examples and with reference to the drawings.

First, as shown in FIGS. 1 and 5, a plurality of cart-type mounts 2 are arranged at appropriate intervals over the entire surface of the foundation 1 of the tank.

This trolley-type mount 2 has wheels 6 at the bottom of a frame body 5 having vertical members 3 and horizontal members 4 made of shaped steel, and has spherical rollers 1 (commercially available product name: Freebear) on the upper surface that can be moved in all directions.
A short tube 9 is fixed vertically via a bracket 8.

In FIG. 2, the level of each trolley type mount 2 and the level between each trolley type mount 2 is adjusted by inserting the threaded rod 11 of the jack base 10 into the short pipe 9 and rotating the nut 12 screwed into the screw rod. Then, the adjacent cart type frames 2 are connected to each other by the connecting beam 13 using bolts and nuts.

In this case, the top surface of the connecting beam 13 and the top surface of the trolley-type mount 2 are flush with each other, and a spherical roller 7 (commercial product name: Freebear, Ballbear, etc.) that can be moved in all directions is attached to the top surface of the connecting beam 13.

In this way, the trolley-type mount 2 and the connecting beam 13 constitute a horizontal workbench.

The base plate base materials 14 are arranged on this workbench as shown in FIG.

At this time, as shown in FIG. 6, welding work, inspection, etc. can be easily carried out by positioning the weld joint portion 15 between each base plate base material 14 exactly in the middle of each adjacent trolley type mount 2.

In parallel with the work of welding and assembling and inspecting the bottom plate, or after these operations are completed, jack ends are provided at appropriate intervals on the outer periphery of the bottom plate, and after the bottom plate is completed, these jack ends are used to secure the outer periphery of the bottom plate. In FIG. 4, the screw rod 1 of the jack base 10 is
The screw rod 11 is raised by turning the upper nut 16 that is screwed into the upper nut 16, the workbench is dismantled, the connecting beam 13 is carried out, the trolley-type mount 2 is pulled out and removed using a winch, and finally the outer circumferential part of the bottom plate is jacked. Lower the bottom plate onto the foundation by jacking the bottom plate, remove the jack and bottom plate, and complete the double-sided welding assembly of the bottom plate.

Note that the roller may be a normal roller type, but a spherical roller D? It is ideal because you can move freely in all directions.

According to the present invention, firstly, since the bottom plate is not suspended from the roof or side plates, there is no need to give the roof or side plates more strength than necessary, and there is no need to attach extra welded parts such as hanging pieces. Thirdly, the bottom plates are arranged on the workbench via spherical rollers that can be moved in all directions, making the arrangement work extremely smooth and efficient. Temporary construction work to support the bottom plate is simple, and removal of the workbench is extremely easy as it can be done via rotating bodies such as spherical rollers and trolley-type mounts.

In other words, the connecting beam can be carried out by rolling the rollers onto the tank foundation, and even if the bottom plate of the trolley-type mount bends and loads are applied during removal, the rollers on the top surface and the wheels on the bottom surface can be rolled. Fifth, the removal work is easy, and since the trolley-type pedestal remains until the end, the work can be done safely.

Sixthly, it is practical and economical since it is used in combination with a work platform consisting of a trolley-type mount, a connecting beam, and a jack operation.

[Brief explanation of the drawing]

Each drawing is for detailed explanation of the present invention.
Figures 4 to 4 are side views, Figure 5 is a front view of the trolley type mount,
FIG. 6 shows a plan view. 1... Tank foundation, 2... Dolly type mount, 3...
Vertical member, 4... Horizontal member, 5... Frame body, 6... Wheel, 7... Spherical roller, 8... Bracket, 9...
Short pipe, 10... jack base, 11... threaded rod,
12, 12'...Nut, 13...Connecting beam, 14...Bottom plate base material, 15...Welded joint part, 16...
・Top nut.

Claims (1)

[Claims] 1. A plurality of trolley-type mounts with rollers arranged on the top surface are arranged at appropriate intervals on the foundation of the tank, and the level between the trolley-type mounts and the level between the trolley-type mounts are Adjust uniformly by operating the jacks, and the jacks will support each trolley-type mount, and the upper surfaces of the trolley-type mounts will be flush with each other by means of a connecting beam with the same rollers as the above-mentioned rollers on the upper surface. to form a workbench for assembling the tank bottom plates, arrange the bottom plates on the workbench, perform welding assembly and inspection work, provide jack end receptacles at necessary locations on the outer periphery of the bottom plates, and After supporting the entire bottom plate at the outer periphery of the bottom plate with temporary supports and lowering the jacks supporting each trolley-type mount so that the wheels of each trolley come into contact with the foundation of the tank, the work platform is dismantled. 1. A method for welding and assembling a tank bottom plate, characterized in that the connecting beam is carried out and the trolley-type mount is pulled out and removed, and finally the jacked end support is removed by jacking operation.