JPH11336364A - Work execution method of tank inside part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a construction period of fitting cold insulators and membranes to a tank inside part and reduce construction cost. SOLUTION: Water is led into internal space formed at a tank inside part, up to the upper part of the tank inside part, and a floating body 11 is made to float on the water surface 19 and positioned at the upper part of the internal space 10. A cold insulator 7 and a membrane 8 are fitted to the peripheral surface of the tank inside part from the floating body. Water in the internal space 10 is drained by a pump 12 to move the floating body 11 gradually downward. Other cold insulators 7 and membranes 8 are fitted so as to form no clearance below the previously fitted cold insulator 7 and membrane 8, and fitting of the cold insulators 7 and membranes 8 and the movement of the floating body 11 are continuously performed to fit the cold insulators 7 and membranes 8 to the whole surface of the tank inside part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an inner portion of a low-temperature tank for storing LPG, LNG and the like.

[0002]

2. Description of the Related Art Among low-temperature tanks for storing LPG, LNG, etc., there are underground low-temperature tanks constructed underground.

Conventionally, a method for constructing a low-temperature tank in the ground is to dig down the ground vertically, excavate a deep and large shaft, form a concrete outer layer on the inner surface thereof, attach a tank roof, and mount the tank inside. Form a space. Subsequently, on the wall of the inner space formed by the outer layer of concrete and the tank roof, a storage tank is formed by combining the inner layer in the order of the cold insulator and the membrane, and finally, the liquid receiving nozzle, the liquid discharging nozzle, the liquid level gauge, and the temperature Attach accessories such as meter and nozzle,
Construction of an underground low temperature tank.

[0004] Of these, as shown in FIG. 4, when attaching a cold insulator and a membrane to the inner surface of the concrete outer layer which is the inner surface of the low-temperature tank, as shown in FIG.
In addition, a scaffold 2 for working at heights for performing construction work is provided.

The scaffold 2 for working at height is a combination of lattice shelves 3 provided in a vertical direction. The lattice shelves 3 are provided with spaces in which humans can move and work in the vertical and horizontal directions. At the upper and lower ends of the work scaffold 2, wheels 4, 4 '
The wheel 4 provided at the upper end corresponds to the running rail 5 provided around the upper end of the inner surface 1 of the concrete outer layer, and the wheel 4 'provided at the lower end is near the bottom surface of the inner surface 1 of the concrete outer layer. Corresponds to the guide rail 6 provided in the peripheral portion of.

When the cold insulator 7 and the membrane 8 are mounted on the inner surface 1 of the concrete outer layer, first, the cold insulator 7 and the membrane 8 are mounted on the inner surface 1 of the concrete outer layer facing the scaffold 2 for working at a high place. The work scaffold 2 is moved to the inner surface 1 of the concrete outer layer to which the cooling material 7 and the membrane 8 are not yet attached, and the cooling material 7 and the membrane 8 are attached to the inner surface 1 of the concrete outer layer. , And the attachment of the cold insulator 7 and the membrane 8 are repeated, so that the cold insulator 7 and the membrane 8 can be attached to the entire surface of the inner surface 1 of the concrete outer layer.

After attaching the cooling material 7 and the membrane 8 to the entire surface of the inner surface 1 of the concrete outer layer, the scaffold 2 for working at height, the running rail 5 and the guide rail 6 are removed from the internal space, and the construction of the tank inner portion is completed. I do.

[0008]

However, in such a tank inner side construction method, it is necessary to install the scaffold 2 for working at height, the traveling rails 5 and the guide rails 6 and to remove them after construction. In addition, there is a problem that work in a high place where workability is poor is required for a long time, and the work period is prolonged and the work cost is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and eliminates the need for scaffolds for working at heights, traveling rails and guide rails, and working at heights for a long time, thereby shortening the construction period and reducing construction costs. The purpose is to provide a method for constructing the tank inner part.

[0010]

SUMMARY OF THE INVENTION According to the present invention, water is introduced into an internal space formed inside a tank up to the upper portion of the tank inner portion, and a floating body is floated on the water surface to be positioned above the internal space. Attach a cooling material and a membrane to the inner peripheral surface of the tank, drain the water in the internal space with a pump, and gradually move the floating body downward so that there is no gap below the cooling material and the membrane attached earlier. The cooling material and the membrane are attached, and the mounting of the cooling material and the membrane and the movement of the floating body are continuously performed, and the cooling material and the membrane are attached to the entire inner surface of the tank.

In this way, the work can be performed without the need for scaffolds for working at heights, traveling rails and guide rails, and the need for long-time working at heights can be eliminated, thereby shortening the construction period and reducing the construction cost. Can be.

In the present invention, a sealing member may be attached to the floating body so as to close the space between the inner surface of the tank in the internal space and the floating body floating on the water surface.

According to this configuration, it is possible to prevent water from leaking from between the inner surface of the tank and the floating body in the inner space, and as a result, the inner surface of the tank can be reliably constructed.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention. In the present embodiment, an example of a tank inner part mounting method in which the cooling material 7 and the membrane 8 are attached to the inner surface of the tank of the underground low-temperature tank without using a scaffold for working at height is shown.

When attaching the cooling material 7 and the membrane 8 to the inner surface 1 of the concrete outer layer, which is the inner surface of the underground type low-temperature tank, first, as shown in FIG. The interior space 10 is provided with a floating body 11, and the outside is provided with a pump 12 for introducing water from the outside to the interior space 10 or discharging water from the interior space 10, and the pump 12 has a tank roof 9 and a floating body 11. And a pipe 13 extending to the vicinity of the bottom of the inner surface 1 of the concrete outer layer.

Here, the floating body 11 includes a scaffold 14 having a shape slightly smaller than the horizontal cross section of the internal space 10 and a scaffold 1.
4 and a plurality of roll-shaped floating portions 15 provided at equal intervals on the lower surface of the floating body 11.
As shown in FIG. 2, a rubber sealing member 16 which is in contact with the inner surface 1 of the concrete outer layer is attached via a bolt 17 so as to close the space between the inner surface 1 of the outer concrete layer and the scaffold 14, and the pipe 13 penetrates. As shown in FIG. 3, a rubber seal member 18 that contacts the pipe 13 is attached via a bolt 17 so as to close the space between the pipe 13 and the scaffold 14 as shown in FIG. 3.

The work of attaching the cold insulator 7 and the membrane 8 is performed as follows.

A pump 12 introduces water from the outside to the upper part of the inside of the tank into the inner space 10 formed by the inner surface 1 of the concrete outer layer, and floats on the water surface 19 to reach the upper end of the inner surface 1 of the concrete outer layer. Sacrifice, floating body 1
The materials and the like of the cold insulator 7 and the membrane 8 are carried into the first scaffold 14 from outside through the carrying-in port 21 of the tank roof 9 using a transporting device 20 such as a crane.

Next, the operation of attaching the cooling material 7 and the membrane 8 to the inner peripheral surface of the inner surface 1 of the concrete outer layer is performed within a range that can be reached from the scaffold 14, and then the water in the internal space 10 is gradually discharged to the outside by the pump 12. Drain and lower the water surface 19,
The floating body 11 is moved downward.

Here, when the floating body 11 moves downward, the sealing member 16 attached to the scaffold 14 slides on the inner side surface 1 of the concrete outer layer, and the portion of the floating body 11 where the pipe 13 penetrates. Similarly, the seal member 18 attached to the slidably slides the pipe 13 to prevent water from overflowing to the scaffold 14.

After attaching the cold insulator 7 and the membrane 8 to the inner peripheral surface of the inner surface 1 of the concrete outer layer, the floating body 11 is moved downward, and the cold insulator 7 and the membrane 8 previously attached are moved.
The other cold insulator 7 and the membrane 8 are attached so as not to form a gap.

Further, the floating body 11 floating on the water surface 19 is moved downward, and the cold insulator 7 is placed on the inner peripheral surface of the inner surface 1 of the concrete outer layer.
And attaching the membrane 8 continuously, and draining all the water in the internal space 10 so that the floating body 11 reaches the bottom surface.

After the floating body 11 reaches the bottom surface, the floating body 11 and the pipe 13 are removed from the internal space 10 and the floating body 11 is removed.
The cold insulator 7 and the membrane 8 are attached to the lowermost portion of the concrete outer layer inner side surface 1 which cannot be attached because they are in the way. 8 can be attached.

For this reason, the work can be performed without the need for the scaffolds, traveling rails, and guide rails for working at heights, which have been required in the related art. Can be planned.

A sealing member 16 for closing the space between the inner surface 1 of the concrete outer layer of the internal space 10 and the floating body 11 and a sealing member 18 for closing the space between the pipe 13 and the floating body 11 are provided on the scaffold 1.
4 prevents water from leaking to the surface of the scaffold from between the concrete outer layer inner side surface 1 and the floating body 11 and between the pipe 13 and the scaffold 14, and as a result, the cold insulator 7 and the membrane on the tank inner part. 8 can be securely mounted.

Incidentally, the method for constructing the tank inner part according to the present invention is not limited to the above embodiment, and the inner space 1
The speed at which the floating body 11 moves due to the drainage of the water introduced into the tank 0 and the speed at which the cooling material 7 and the membrane 8 are attached to the inside of the tank are linked to increase the efficiency of the work. Seawater may be introduced, the floating body 11 may be of any material and shape as long as it has buoyancy, and it is needless to say that various changes can be made without departing from the gist of the present invention. .

[0028]

According to the above-described method for constructing a tank inner portion according to the present invention, the following various excellent effects can be obtained.

(I) A scaffold for working at heights which was conventionally required,
The construction can be performed without the need for the traveling rail and the guide rail, and the work for a long time at a high place is not required, so that the construction period can be shortened and the construction cost can be reduced.

(II) Since a seal member is attached to the floating body so as to close the space between the inner surface of the tank in the internal space and the floating body floating on the water surface, leakage of water from between the inner surface of the tank in the internal space and the floating body is prevented. As a result, the construction on the inner surface of the tank can be reliably performed.

[Brief description of the drawings]

FIG. 1 is a schematic view of a longitudinal side surface showing an example of an embodiment of a tank inner part construction method of the present invention.

FIG. 2 is a detailed view of a seal member attached around a scaffold in the tank inner part construction method of the present invention.

FIG. 3 is a detailed view of a seal member attached to a scaffold portion through which a pipe penetrates in the tank inner part construction method of the present invention.

FIG. 4 is a diagram showing a state where a cold insulator and a membrane are attached to a conventional underground low-temperature tank.

[Explanation of symbols]

 7 Cooling material 8 Membrane 9 Tank roof 10 Internal space 11 Floating body 15 Seal member 19 Water surface

Claims (2)

[Claims] 1. Water is introduced into an internal space formed inside a tank to the upper part of the tank inner part, and a floating body is floated on the water surface to be positioned above the inner space, and cool is kept on the peripheral surface of the tank inner part from the floating body. Attach the material and the membrane, drain the water in the internal space with the pump and gradually move the floating body downward, attach the other cold insulator and the membrane so as not to make a gap below the previously attached cold insulator and membrane, A method for constructing a tank inner portion, comprising: mounting a cold insulator and a membrane and moving a floating body continuously, and attaching a cold insulator and a membrane to the entire surface of the tank inner portion. 2. The tank inner part construction method according to claim 1, wherein a seal member is attached to the floating body so as to close a space between the inner surface of the tank in the internal space and the floating body floating on the water surface.