JPH04327176A - Temporary tank roof and method for its manufacture - Google Patents

Abstract

PURPOSE:To permit the various interior construction works of a tank to be carried out safely and smoothly without being affected by rain water, etc., by installing a gas-filled bag roof temporarily in place of the permanent roof after the construction of the side wall of the tank having a flat bottomed, cylindrical dome roof. CONSTITUTION:After the construction of a side wall 3 of a tank 1' to be covered with a flat bottomed, cylindrical dome roof, an outer sheet 7' and an inner sheet 7' are provided between upper and lower cobweb-like nets 8 and 9, such nets are mounted on the top part 3' of the side wall and air is sent thereinto from a compressor 15 through a hose 14 to make a gas-filled bag shaped like an upwardly convex lens and cover the top of the tank therewith, thereby causing this bag to perform roof function. The gas-filled bag pressed into close contact with the peripheral top edge of the side wall functions as a roof to drain rain water outward, whereby the various interior construction works of the tank can be carried out safely and smoothly, leading to the shortening of the term of the construction work with a reduction in cost.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The disclosed technology belongs to the technical field of the structure and formation method of temporary roofs during the construction of tanks such as oil tanks.

0002

BACKGROUND OF THE INVENTION As is well known, the prosperity of modern society is largely due to the development of science and technology, and various new materials are used and large amounts of energy are consumed.

[0003] Modern society is said to be a ``society that floats on oil,'' as various new materials rely heavily on oil, and a large amount of energy is also supplemented by oil.

[0004] Therefore, in our country, which is poor in resources and energy, it is essential to supply and stockpile oil, etc.
Therefore, large-scale stockpiling of not only oil but also LNG, LPG, etc. requires large capacity and large tanks, not just service tanks or stockpiling tanks, and these tanks can be of either single-shell or double-shell construction. In addition, regardless of whether it is underground, semi-underground, or above ground, it is designed to have a large capacity, and therefore the construction period is long, leading to increased costs, and it is safe and
Early completion of the project is strongly desired.

By the way, as shown in FIG. 10, for example, an above-ground type flat-bottomed cylindrical dome roof tank 1, etc., has become extremely large in diameter and height due to the increase in capacity, and its construction is a major undertaking. This process requires a long period of time.

[0006]

[Problems to be Solved by the Invention] Normally, in the construction process of the flat-bottomed cylindrical dome roof tank 1, due to design and construction constraints, the side wall 3 is separated from the foundation 2.
After constructing the internal bottom plate 4 and manholes 5, 5...
Although it is desirable to construct a roof 6 to avoid the effects of precipitation etc. on construction of pump barrels, etc., the construction work of the roof 6 must be carried out spatially above the tank 1. difficult in terms of
Therefore, the bottom plate 4, manhole 5, pump barrel, etc. are carried out in the open air, which is exposed to the rain.Therefore, these works are extremely difficult, and there are many incidental works such as drainage work, which increases the cost. There were disadvantages associated with it.

[0007] Furthermore, not only the construction of the bottom plate 4 but also the experimental inspection such as the X-ray inspection after welding were unsuccessful, and there was a bottleneck in that these inspections had to be conducted without a roof.

[0008] Also, in the construction of the roof, as mentioned above,
Because the size of the tank 1 is large, its side walls 3 are also large in area and high, making it extremely difficult to bring in roofing materials, requiring the use of large heavy machinery such as cranes, and other equipment. There was also the inconvenience of interference.

[0009] Also, from a safety point of view, there was a problem in that while the roof 6 was being constructed, construction of the bottom plate 4, manhole 5, etc. would also be hindered.

[0010] Instead of constructing the roof body in a block shape using a crane or the like over an extremely high side wall, there is also a mode in which the roof body is constructed by a so-called air raising method, but a pressing device is required. Furthermore, there is a problem in that a large number of balance wires and the like are required and their operation is required, and in addition, careful consideration is required for safety, which may hinder the progress of the work.

[0011]

Purpose of the Invention The purpose of the invention of this application is to solve the technical problem of construction of various large tanks based on the above-mentioned prior art while being exposed to rain, and to solve the problem of construction of side walls of tanks. An excellent temporary tank roof that has sufficient cover function at a low cost and in a short period of time, and is useful for the storage technology application field in the energy industry by allowing construction of the bottom plate etc. to be carried out smoothly afterwards. The purpose is to provide a manufacturing method.

0012

[Means for Solving the Problems] In order to solve the above-mentioned problems, the structure of the invention of this application, which is based on the above-mentioned claims, is to solve the above-mentioned problems. After constructing the side wall, there are at least two wires such as a spider web net on the top to provide a supporting function, and between these wires there are upper and lower flexible and airtight inner and outer sheets. and a shape-retaining cord interposed between them,
A gas such as heated compressed air is pumped and filled to make it swell, forming a gas bag with an upwardly convex lens-shaped cross section, which can cover the entire upper part of the tank. Precipitation, dust, etc. are removed using a sheet above the bag. The material is smoothed to prevent it from penetrating into the tank, and ports can be provided on the upper and lower sheets of the bag to freely transport various materials into the tank and to construct the roof body. The upper and lower sheets of the gas bag can be moved in and out of the tank, and the sheets above and below the gas bag can sufficiently maintain their designed shape with their shape-retaining ropes. After the designated construction inside the tank is completed, the gas bag can be smoothly removed and the roof itself can be constructed. Technical measures have been taken to make it possible to do so.

[0013]

Embodiments Next, embodiments of the invention of this application will be described below with reference to FIGS. 1 to 9.

10 and 11 will be described using the same reference numerals.

The illustrated embodiment is an embodiment of a single-shell flat-bottomed cylindrical dome-roofed tank 1 for petroleum storage shown in FIG. After construction, a temporary tank roof 1' is temporarily installed on top of the tank roof 1' during the construction period, and a gas bag 7 having an upwardly convex lens cross section, a wire 8 supporting it from below, and a temporary tank roof 1' extending from above. It consists of three parts: an inner wire 9 that is held down to maintain the set state.

As shown in FIG. 6, the upper and lower wires 8 and 9 may be, for example, a spider web-like net woven from a predetermined synthetic resin rope or the like. It can be manufactured without any difficulty at this point in time.

These upper and lower wires 8 and 9
As shown in FIG. 2, their peripheral portions can be engaged as anchors with embedded bolts, stud dowels 10, etc. for constructing the roof body at the top 3' of the constructed side wall 3.

The gas bag 7 is made of a sheet having sufficient flexibility and airtightness, such as a cloth with a predetermined strength and a vinyl lining, and is composed of an outer sheet 7' and an inner sheet 7''.
As shown in FIG. 3, predetermined shape-retaining cables 11, 11...
etc. are sewn in a quilting manner, and between them are tape-like retainers of a set length at a predetermined pitch, that is, a length corresponding to the thickness of the gas bag 7 passing through the upwardly convex lens-shaped cross section. The cables 12, 12 are stretched, and on the ground, these cables are folded to a predetermined small size to form a bag unit, just as a parachute is folded when not in use.

Further, as shown in FIG. 4, the outer sheet 7' and the inner sheet 7'' have a tight seal 13 formed on their peripheral edges to maintain airtightness, and a hose made of vinyl chloride or the like is formed. 14, it is connected to a compressor device 15 provided at a predetermined side of the tank 1', as shown in FIG.

The compressor device 15 is provided with a suitable heater so that heated compressed air can be force-fed into the gas bag 7 through the hose 14.

[0021] Therefore, until the side wall 3 of the tank 1' is constructed, the gas sac 7 is in a contracted state with gas vented between the spider web-like nets 8 and 9 above and below it on the ground. The nets 8 and 9 are inserted into the nets and folded compactly into a predetermined shape and made into parts.

[0022] As shown in Fig. 7, after the side wall 3 is constructed on the foundation 2 in a predetermined manner, it is folded up using a crane or the like or a pulley or the like previously installed at the top 3' of the side wall 3. Lift the capsular bag unit in that state or in a predetermined expanded position (in this state, compressed air is not yet being fed into the capsular bag 7 by the compressor device 15). Anchor 3 at the top 3' of 3
'' to connect the upper and lower wires 8 and 9 to the tank 1.
Stretched like a spider web on top of '.

[0023] In this state, when compressed air is force-fed into the gas bag 7 by the compressor device 15 via the hose 14, the compressed air force-fed between the outer sheet 7' and the inner sheet 7'' is transferred to the gas bag 7. The shape-retaining cables 11 of each outer sheet 7' and the inner sheet 7'' and the shape-retaining cables 12 between the two bulge out into an upwardly convex lens shape. are formed into a capsular bag 7, the entire weight of which is supported by the lower wire net 8, and
It is sufficiently supported by the upper wire net 9 against wind pressure, etc., and the initial set posture is sufficiently maintained without being blown off or separated from the top 3' of the side wall 3.

Of course, the gas bag 7 is flexible as a whole, but there is a tight seal 13 at the periphery of the gas bag.
Because of this, compressed air does not leak, and a flexible pressurized state is guaranteed at the entire periphery of the top 3' of the side wall 3, and the tank 1' at the top 3' is The airtight condition inside and outside is maintained, and there is no intrusion of rainwater, and since the gas bag 7 has an upwardly convex lens shape, as shown in Fig. 2, precipitation smoothly descends to the periphery and flows in the direction of the arrow. As shown, the water is discharged outside the side wall 3, and there is no need for any special rain protection.

When there is a risk of snowfall or frost in winter, the heater in the compressor device 15 is operated to supply compressed air into the gas bag 7. Snow and frost are melted by the internal pressure and drained smoothly along the slope of the outer sheet 7'.

Therefore, during this period, in the tank 1', not only the construction of the tank bottom plate, but also its X-ray inspection, construction of the pump barrel, etc. can be carried out smoothly without any obstacles such as rain and wind due to the temporary tank roof 6'. .

[0027] Regarding lighting, etc., by covering predetermined portions of the outer sheet 7' and the inner sheet 7'' with transparent vinyl chloride, etc., it is possible to provide light as a kind of transparent window.

In addition, for carrying in various base materials and materials, as shown in FIG. A base material inlet 18 is formed with tape (trade name) 17 and can be opened and closed as appropriate to carry in and out materials and base materials.

Next, regarding the gas bag, as shown in the embodiment shown in FIG.
2 is integrally formed into a kind of mushroom shape to maintain a stable posture, and to maintain sufficient strength and rigidity especially as a temporary tank roof 6'' in a large tank. As shown in FIG. 9, outer sheet 7',
Alternatively, each of the shape-retaining ropes of the inner sheet 7'' may be provided with a ring-shaped shape-retaining rope 11' formed of a vinyl chloride hose and provided with ejection nozzles 19, 19, . . . .

[0030] The embodiments of the invention of this application are, of course, not limited to the above-mentioned embodiments. For example, a hot air jet nozzle may be provided inside the tank of the gas bag to improve the working environment inside the tank. Various aspects can be adopted, such as making it so. maintain the condition.

[0031] In addition, the target tank may be of any shape, not just a flat-bottom cylindrical dome roof, and not only an above-ground type, but also an underground type, a semi-underground type tank, a single shell tank, a double shell tank, etc. It can also be adapted to grain tanks.

[0032] The object is used not only for storage tanks but also for reserve tanks, and not only for petroleum tanks but also for L
Of course, it can also be applied to NG, LPG tanks, etc.

[0033] When the prescribed work inside the tank is completed, the air inside the gas bag 7 is appropriately removed, and the gas bag is folded together with the upper and lower net wires via a crane or pulley and removed. Okay, then the top 3' of the side wall 3
It is sufficient to construct the roof body in a predetermined manner on top in the same manner as in the conventional manner.

[0034]

As described above, according to the invention of this application, basically when constructing various oil tanks, etc., after constructing a large-diameter side wall, a gas bag made of a thin film sheet is attached to the top part using a spider web-like net. A temporary tank roof can be easily and easily set on the top of the side wall by setting it in an interposed position, and the roof will fully function as a roof against rainwater until the various construction work inside the tank is completed. Moreover, the safety of the work inside the tank can be fully guaranteed, resulting in excellent effects such as shortening the construction period and making it possible to perform the work accurately.

[0035] Furthermore, since the temporary tank roof can be made of a flexible, airtight sheet, it can not only be manufactured in a factory, but also can be used repeatedly as it is unlikely to be damaged. This has the excellent effect of reducing construction costs.

[0036] Since the upper and lower surfaces of the gas bag are supported by wires such as spider web-like nets on the upper and lower sides, the gas bag has an upwardly convex lens shape, and its upper surface is integrally curved. Since rain can be removed smoothly, there is no need to do any special rain protection, and there is also the effect of good workability and ease of handling.

[0037] In addition, the shape retention of the gas bag is not only ensured by the shape-retaining ropes provided on the outer sheet and the back sheet, and the shape-retaining ropes interposed between them, but also by the upper and lower gas bags. It is also maintained by wires such as bags, and has the effect that it can sufficiently maintain its function as a roof against wind and rain.

[0038] Also, the temporary tank roof has the advantage of being flexible in setting, resetting, carrying in, and removing, and being easy to handle since it is not heavy.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams of embodiments of the invention of this application.

FIG. 1 is an overall schematic sectional view of one embodiment.

FIG. 2 is a partially enlarged sectional view of FIG. 1;

FIG. 3 is a partially cutaway perspective view of the sheet of the gas sac.

FIG. 4 is a partially enlarged perspective view of the gas pumping mechanism of the gas bag.

FIG. 5 is an enlarged perspective view of the gas bag entrance.

FIG. 6 is a schematic plan view of the wire net.

FIG. 7 is a cross-sectional view of the temporary tank roof setting process.

FIG. 8 is a schematic cross-sectional view of another embodiment.

FIG. 9 is a plan view of a shape-retaining cord according to another embodiment.

FIG. 10 is a schematic side view of a flat bottom cylindrical dome roof tank.

FIG. 11 is a cross-sectional view of the construction process of a flat bottom cylindrical dome roof tank.

[Explanation of symbols]

3...Side wall 3'...Top 6''...Temporary roof tank 7'...Outer sheet (airtight sheet) 7''...
Inner sheet (airtight sheet) 7 ... Gas bag 8, 9 ... Wire net 11, 12 ... Shape-retaining cord 8 ... Nozzle 3'' ... Anchor

Claims (11)

[Claims] Claim 1: A temporary tank roof made of a flexible air-tight sheet whose peripheral edge engages with the top of the tank side wall and covers the upper part of the tank, wherein the flexible and airtight outer sheet and inner sheet have an upwardly convex cross section. What is claimed is: 1. A temporary tank roof, which forms a gas sac, and is interposed between at least a pair of upper and lower wires stretched over the top of a side wall of the tank. 2. The temporary tank roof according to claim 1, wherein shape-retaining ropes are formed along at least the surfaces of the outer sheet and the inner sheet. 3. The temporary tank roof according to claim 2, wherein the shape-retaining rope is formed of an air supply passage having a nozzle thereon. 4. The temporary tank roof according to claim 1, wherein a shape-retaining rope is provided between the outer sheet and the inner sheet. 5. The temporary tank roof according to claim 1, wherein hot air can be freely enclosed in the gas bag. 6. The temporary tank roof according to claim 1, wherein the wire is formed into a net shape. 7. The temporary tank roof according to claim 1, wherein a transparent window is formed on at least the outer sheet of the inner and outer sheets. 8. The temporary tank roof according to claim 1, wherein a material inlet that can be opened and closed is formed in the inner and outer sheets. 9. A temporary tank roof manufacturing method in which the roof is made of a flexible airtight sheet and its peripheral edge is engaged with the top of the tank side wall to cover the top of the tank, wherein an anchor is provided at the top of the tank side wall and at least two wires are connected to the top of the tank. The upper and lower capsular bags are interposed between the upper and lower wires with their peripheries in close contact with each other, and then gas is force-fed and filled into the gas pouch. Features: Temporary tank roof manufacturing method. 10. The method for manufacturing a temporary tank roof according to claim 8, wherein the gas is heated air. 11. The method of manufacturing a temporary tank roof according to claim 8, wherein said work is carried out in a floating manner through the water surface of the test water during a tank water filling test.