JPH084994A - Method of building roof structure for underground storage tank - Google Patents

Abstract

PURPOSE:To provide a method of building a basic roof structure, easily and rapidly, which can rationally and greatly shorten the period of working for an overall underground storage tank, and which can simultaneously build the body of the tank and the roof thereof. CONSTITUTION:A ring-like knuckle plate 3 is integrally incorporated with the peripheral end of an opening 2 of a tank body, and a basic roof structure unit 5 having a bisplit center ring 4, and a plurality of split roof members 6 are previously prepared. Arched tower columns 7 are planted being opposed together in the vicinity of the tank body 1, and a obliquely suspending wire 1 is stretched between the columns 7. Thus, the basis roof structure unit 5 is laid diametrically of the opening 2 of the tank body 1 with the use of the columns 7 and the wire 10, and by using the basic roof structure unit 5 and a working floor 12 as a scaffold, the split roof members 6 are laid being opposed one another so as to complete the formation of the roof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for constructing a roof for an underground storage tank, and more particularly to a method for constructing a roof for an underground storage tank capable of simultaneously constructing a tank body and a roof.

[0002]

BACKGROUND OF THE INVENTION After constructing a tank body having a bottomed cylindrical concrete structure with an open upper part underground, an annular knuckle is formed along the circumferential direction at the periphery of the opening of the concrete tank body. A dome-shaped roof covering the opening is assembled on the bottom of the tank body while the plate is attached. When the roof is assembled on the bottom of the tank body, the roof is raised by the air leasing or jack-up method, and the knuckle plate is attached to the base end portion thereof. When constructing a conventional underground storage tank, the time required to construct the roof occupies about half of the construction time of the entire tank body. After completing the construction to build the roof, assemble the roof on the bottom of the tank body, and then lift it up by jacking up or air-raising method, then attach it to the tank body, so the roof is assembled In the meantime, there was an inconvenience that work inside the tank could not be performed at all. Further, if the roof cannot be attached to the opening in the upper part of the concrete tank body, there is a problem that the cold insulating material layer cannot be attached to the inner wall of the tank to assemble the inner tank. That is, when moisture enters the cold insulating material layer, the cold insulating performance is impaired.

[0003]

2. Description of the Related Art As a means for solving the above problems, a bottomed cylindrical tank body is buried underground and a ring-shaped knuckle plate is provided along the opening of the tank body. The roof part is divided into a center part that divides the central top part of the roof and a fan-shaped divided roof piece that is radially divided into a plurality of parts, and the roof part is opposed to the center part. After attaching at least two of the above-mentioned divided roof pieces to form a basic roof block, this basic roof block is attached to the above knuckle plate and hung over the opening of the tank body, and then left in the above center and knuckle plate in sequence. A roof construction method for an underground low temperature tank has been proposed in which the divided roof pieces are laid over and joined to construct the entire roof. (JP-A-4
(See Japanese Patent Publication No. 302799)

[0004]

As described above, by connecting two split roof pieces centering on the center part on the same left and right axis of the center part, the diameter of the opening of the tank body having a diameter of 60 to 70 m can be obtained. Forming a suitable basic roof block requires a suitable area for the site of the construction site of the underground storage tank and is subject to restrictions, and such a long basic roof block can be carried into the opening of the tank body. Not only does it require a large amount of mechanical equipment and power to build it, but it also requires a large tensioning device to secure the slope of this basic roof block, which is a constraint. However, there is no guarantee that the construction period can be shortened.

The object of the present invention is to construct a basic roof structure easily and quickly, to significantly shorten the construction period of the entire underground storage tank, and to construct the tank body and roof. It is to provide a construction method that can be performed at the same time.

[0006]

The structure of the present invention for solving the problems of the prior art is to construct a concrete-structured tank body having an open upper part in the underground, and to form a ring shape at the peripheral edge of the opening of the tank body. After the knuckle plate is integrally provided, a dome-shaped roof that covers the opening of the tank body while sequentially supporting and supporting the base end of the roof structure whose plane shape is divided into multiple sectors on this knuckle plate is sequentially supported. In the method of constructing a roof of an underground storage tank configured as described above, two basic roof construction bodies each having a fan-shaped planar shape forming a dome-shaped roof and integrally provided with a two-divided center ring, and a plurality of divided constructions. The roof structure is loaded in the vicinity of the tank body in advance, and on the other hand, a gate tower is erected in the vicinity of the upper part of the tank body facing each other across the opening of the tank body. Cable to the anchor The knuckle plate part corresponding to the gate-type tower pillar by the preparatory process in which the free end is suspended around the tank body side by hanging the In addition to supporting it, the oblique suspension wire is connected and supported at a required position of the basic roof structure, then the crane support is cut off, and the two divided center rings of both basic roof structures are butted against each other and closed to close the tank opening. The process of erection and formation of the basic roof structure in the diametrical direction is performed, and the divided roof structure is laid between the center ring and the knuckle plate, which are butted and closed, facing each other sequentially by crane operation etc. And the steps of completing the roof, and after the roof is completed, the oblique suspension wire, the dismantling of the portal tower, and the removal process. Block and other adjusting means, a work floor to be connected to each other is provided under the two-divided center ring provided at the tip of the basic roof structure, and the center ring butt adjustment is adjusted by the extension / contraction adjusting means of the oblique suspension wire. And the closing work is performed on the work floor.

[0007]

With the above structure, the assembly of the divided roof structure of the dome-shaped roof can be formed in parallel with the construction work of the concrete tank body. In addition, since two basic roof structures are formed by diagonally hanging from two opposing gate tower columns, other divided roof structures are erected on the center ring of the tank opening and the outer knuckle plate. The suspended basic roof structure can be used as a work base, and a roof can be constructed without using a supporting pillar from the bottom for roof support or a special scaffold. Furthermore, the roof will cover the opening of the concrete tank body by sequentially constructing the divided roof structure, and depending on the covered portion, attach a cold insulating material layer to the inner wall of the tank to form the inner tank. It can be assembled and the construction period of the whole tank can be shortened.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, details of embodiments of the method of the present invention will be described with reference to the drawings. A tank 1 having a concrete structure with an upper part opened in the basement is constructed, and a ring-shaped knuckle plate 3 is integrally provided at a peripheral end of an opening 2 of the tank 1. On the other hand, in the vicinity of the construction site of the underground storage tank, as shown in FIG. 3, two basic roof configurations in which the dome-shaped roof is fan-shaped in plan and the center ring 4 divided into two is integrally provided. The body 5 and the plurality of split roof structures 6 as shown in FIG. 4 are loaded. In addition, a gate tower 7 is erected symmetrically in the vicinity of the upper portion of the tank 1 facing each other across the opening 2 of the tank 1, and the base end is provided on the upper portion of the gate tower 7. A plurality of oblique suspension wires 10 each having a chain block 9 connected to an anchor 8 provided on the ground surface are hung and hung around, and the ends thereof are suspended toward the tank body 1 side. Next, as shown in FIG.
And the base end of the same is joined and connected to the knuckle plate 3 corresponding to the gate tower 7, and then the slanted hanging wire 10 is hung on the left and right sides of the basic roof structure 5. The basic roof construction body 5 is held in the posture shown in FIG. 1 by connecting to the required portion of the roof frame 5a, and the installation angle of the basic roof construction body 5 is adjusted by operating the chain block 9 provided on each of the oblique suspension wires 10. The center rings 4 which are adjusted and provided at the tips of the left and right basic roof structures 5 that are laid across oppositely are butt-welded together using the working floor 12 of the basic roof structure 5, and the tank is closed. The basic roof structure 5 integrated in the diameter direction of the opening 2 of the body 1 is installed. Simultaneously with the connection of the oblique suspension wire 10, the support by the crane 11 is released, and the crane 11 is engaged in other work, that is, the work of loading the split roof structure 6. When the erection of the basic roof structure 5 is completed, the divided roof structure 6 is carried in by the crane 11 while using the erected basic roof structure 5 and the work floor 12 as a work scaffold, and as shown in FIG. , Basic roof structure 5
The dome-shaped roof is formed by symmetrically straddling the middle part of the slab, the base end of which is jointly connected to the knuckle plate 3 and the tip end of which is welded and connected to the joint 4a of the center ring 4. To complete. After the roof is completed, the oblique suspension wire 10 and the gate tower 7 are disassembled and removed, and the roof construction work is completed. In addition, by constructing the basic roof structure 5 and the divided roof structure 6, the tank body 1
Since the opening 2 is covered, the cold insulating material 13 is attached to the side wall of the tank body 1 in parallel depending on the covered portion, as shown in FIG. In the figure, reference numeral 14 denotes a reinforcing material.

[0009]

As described above, according to the construction method of the present invention, the following effects can be obtained. (A) Manufacture two basic roof constructions that integrate a bisected center ring that forms a dome-shaped roof and a plurality of split roof constructions near the construction site of an underground storage tank or in a factory By doing so, it is possible to increase the factory operation rate and to do it in parallel with the tank construction work,
Not only can it be brought into the site quickly and the construction period can be shortened, but (b) Butt closing and erection of the basic roof structure can be done easily by using opposing gate towers and diagonal suspension wires. It can be done quickly, and the erected basic roof structure and work floor can be used as work scaffolds for quick erection of the divided roof structure while considering the load distribution, and it was covered by the erection of this roof structure. Since the work of attaching a cold insulating material or the like is performed in parallel on a part of the tank inner surface, the construction period can be further shortened.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a construction work state of a basic roof structure.

FIG. 2 is a plan view showing a procedure for constructing a divided roof structure using the basic roof structure and the work floor as work scaffolds.

FIG. 3 is a plan view of a basic roof structure.

FIG. 4 is a plan view of a split roof structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank body 2 Opening part 3 Knuckle plate 4 Center ring 4a Joint 5 Basic roof structure 6 Divided roof structure 7 Gate tower 8 Anchor 9 Chain block 10 Wire 11 Crane 12 Work floor 13 Cooling material 14 Reinforcement material

Claims (2)

[Claims] 1. A concrete-structured tank body having an open upper part is constructed underground, and a ring-shaped knuckle plate is integrally provided at the peripheral edge of the opening of the tank body, and then the knuckle plate is divided into a plurality of parts. In the method for constructing a roof of an underground storage tank, a dome-shaped roof that covers the opening of the tank body is formed by sequentially supporting and supporting the base ends of the roof structure that has a fan-shaped planar shape. The two-dimensional roof structure, which has a fan-shaped planar shape and is integrally provided with a center ring divided into two, and a plurality of divided roof structures are loaded in the vicinity of the tank body in advance,
On the other hand, a gate-type tower pillar is erected in the vicinity of the upper part of the tank body facing each other across the tank body opening portion, and a plurality of oblique suspension wires whose base ends are connected to anchors are provided on the upper part of the gate-type tower pillar. A preparatory process in which the free end is hung down to hang down toward the tank body side, and the base end parts of both basic roof construction parts are jointly supported by the knuckle plate part corresponding to the gate tower column by crane operation etc. At the same time, after the oblique suspension wire is connected and supported at a required position of the basic roof structure, the crane support is cut off, and the two divided center rings of both basic roof structures are butted against each other and closed to diametrically measure the tank body opening. In the process of erection and connection of the basic roof structure, the divided roof structure should not be sequentially laid across the butt jointed center ring and knuckle plate by facing each other by crane operation. Step a roof after completion oblique hanging wire, demolition of the portal tower pillar, roof construction method of underground storage tank, characterized by comprising a step of removal to complete the roof by joining Luo surroundings. 2. The oblique suspension wire is provided with adjusting means such as a chain block, and a working floor to be coupled to each other is provided below the two-divided center ring provided at the tip of the basic roof structure. The roof construction method for an underground storage tank according to claim 1, wherein the expansion and contraction adjusting means adjust the butting of the center ring to perform the closing work on the work floor.