JP4913630B2 - Sealing mechanism for circular water storage tank, method for producing flexible sheet hollow tube annular body for the mechanism, and method for applying the mechanism to the water storage tank - Google Patents

Description

  The present invention relates to a sealing mechanism for a circular water storage tank and a method for producing a flexible sheet hollow tube annular body for the mechanism. More specifically, the present invention relates to a circular water tank sealing mechanism capable of easily and effectively sealing and protecting a water storage space when repairing or repairing a roof of a circular water tank comprising a cylindrical body and a roof. The mechanism that expands in an annular shape by injecting gas, allows the peripheral edge of the circular sealing sheet to be in close contact with the inner wall of the main body without manpower, and prevents the entry of foreign substances such as dust, thereby reliably protecting the water storage space The present invention relates to a method for manufacturing a hollow sheet annular body made of a flexible sheet.

Many circular water storage tanks for storing drinking water, industrial water, and the like have a cylindrical body and a roof. The main body of the tank is composed of a circular bottom plate and a cylindrical side wall. Conventionally, the side wall is constructed from prestressed concrete, and the roof is constructed in a dome shape from reinforced concrete. The thickness of the roof portion is smaller than the thickness of the side wall, and since the concrete deteriorates due to being attacked by chlorine in the water, the main body can be used continuously, but the roof portion is in a state where it cannot be used. In such a case, the service life of the circular water storage tank is extended by repairing the roof portion, or by dismantling the roof portion and replacing it with an aluminum alloy dome roof for repair.
When renovating or repairing a circular water storage tank, it is necessary to temporarily stop the use of the tank. However, drinking water is used every day, and water supply becomes impossible when the tank is stopped. For this reason, development of a construction method that can repair or repair the roof portion while using a circular water storage tank and continuing water supply is underway.
For example, as a method of repairing the roof of a tank that can repair and dismantle the existing roof without deteriorating the quality of the stored water while using the tank, the storage space above the stored water is sealed. Temporary tension structure that builds a temporary sealed structure that does not release substances that deteriorate water quality even when it comes into contact with water, and blocks falling objects that damage the temporary sealed structure in the storage space above the temporary sealed structure There has been proposed a method for repairing a roof portion of a tank in which an existing roof portion is repaired after the body is erected (Patent Document 1).
FIG. 15 is an explanatory diagram of this repair method. A circular sealing sheet 38 for hermetically protecting the water storage space is installed on the upper part of the circular water storage tank 37 composed of the cylindrical main body 35 and the roof portion 36, and a temporary tension structure 39 for blocking fallen objects is provided above the circular sealing sheet 38. Temporary. In this state, since the sealing sheet is protected from the impact of falling objects and the water storage space is protected from the external environment, the roof can be constructed without deteriorating the quality of the stored water.
FIG. 16 is an explanatory diagram of a joined state between the sealing sheet and the inner wall of the tank body. A part of the anchor bolt 41 is embedded in the side wall 40 of the tank, and a hole opened in the peripheral portion of the sealing sheet 38 is inserted into the anchor bolt. The peripheral edge of the sealing sheet is pressed by a pressing plate 42 inserted through an anchor bolt and fastened by a screw bolt 43. With such a configuration, the sealing sheet is fixed to the inner wall of the tank main body, but dust or the like may be mixed from the gap between the sealing sheet and the inner wall of the main body. By reducing the distance between adjacent anchor bolts, it is possible to reduce the gap between the sealing sheet and the inner wall of the main body, but it is not possible to completely eliminate the concern of dust contamination, and the number of anchor bolts cannot be increased. This leads to an increase in the number of work steps.
JP 2001-171788 A

  The present invention provides a sealing mechanism and a gas injection of a circular water tank that can easily and effectively seal and protect a water storage space when repairing or repairing a roof part of a circular water tank consisting of a cylindrical main body and a roof part. Flexibility for the mechanism that expands in an annular shape, allows the peripheral edge of the circular sealing sheet to be in close contact with the inner wall of the main body without human intervention, prevents dust and other foreign matter from entering, and reliably protects the water storage space It is made for the purpose of providing the manufacturing method of the hollow pipe | tube annular body made from an adhesive sheet.

As a result of intensive studies to solve the above problems, the inventors have provided anchor bolts for fixing the sealing sheet to the inner wall of the tank body above the sealing sheet surface, and having an outer diameter equal to the diameter of the inner wall of the body. The hollow sheet annular body made of flexible sheet is placed and bonded to the sealing sheet, and the annular body is inflated by press-fitting gas into the hollow tube, whereby the peripheral edge of the sealing sheet is pressed against the inner wall of the main body and a gap is formed. Furthermore, a plurality of cylindrical hollow tubes whose both ends are cut by a plane that is not orthogonal to the central axis of the cylindrical sheet are formed from the flexible sheet hollow tube annular body. By forming a shape in which the busbars are connected so as to be continuous with each other, when a gas is injected into the hollow tube annular body made of a flexible sheet and inflated, it smoothly becomes an annular shape, and the peripheral edge of the hermetic sheet without manpower On the inner wall of the main unit It found that only obtained, and have completed the present invention based on this finding.
That is, the present invention
(1) A sealing mechanism for a circular water storage tank comprising a circular sealing sheet and a flexible sheet hollow tube annular body installed on the upper part of the main body of the circular water storage tank, wherein the diameter of the circular sealing sheet is the diameter of the circular water storage tank. The flexible sheet in a state in which the peripheral edge of the circular sealing sheet is larger and is locked to the upper inner surface of the circular water storage tank, the hollow tube annular body made of a flexible sheet has a gas filling port, and the gas is press-fitted and expanded. The outer periphery of the hollow tube annular body is in contact with the inner periphery of the circular water storage tank through the circular sealing sheet, and the hollow sheet annular body made of the flexible sheet has a shape in which a plurality of cylindrical hollow tubes are connected. And each cylindrical hollow tube to be connected is cut at a plane where both ends of the cylinder are not perpendicular to the central axis of the cylindrical shape, and is plane-symmetric with respect to one plane including the central axis. The longest busbar and the shortest busbar of the cylindrical hollow tube As such, sealing mechanism of a circular water tank, characterized in that a plurality of cylindrical hollow tube has a shape which is connected,
(2) Form a notch consisting of two substantially sinusoids connecting both side edges at 15 to 60 points in the longitudinal direction of the belt-like flexible sheet, and join the flexible sheets adjacent to the notch After that, both sides of the belt-like flexible sheet are joined to form a hollow tube. The hollow sheet annular body made of a flexible sheet for a sealing mechanism of a circular water storage tank according to (1) Production method,
(3) A method for applying the sealing mechanism of the circular water tank according to (1) to the water tank, wherein the roof of the circular water tank is repaired or repaired when the roof of the water tank is formed of a cylindrical body and a roof. A manhole is opened at two locations facing each other, and the tip of a circular sealing sheet having two gas filling ports wound linearly is drawn from one of the manholes and carried to the other manhole facing the manhole. By injecting gas from the two gas filling ports and expanding the hollow tube annular body made of the flexible sheet into a ring shape, the circular sealing sheet is completely opened, and the peripheral edge of the circular sealing sheet is flexed. A method for applying the sealing mechanism of the circular water tank to the water storage tank, wherein the circular water tank is pressed against the wall of the circular sheet annular tube made of a conductive sheet, and
(4) A pull-in rope is attached to the front end of a circular sealed sheet that is wound linearly, the pull-in rope is pulled from one manhole, transported to the other facing manhole, and the pull-in rope is pulled out from the other manhole. As a result, the circular sealing sheet wound linearly is drawn into the water storage tank, and the gas is fed from the gas filling ports at both ends of the circular sealing sheet wrapped linearly, thereby assisting in fixing the sealing sheet of the circular sealing sheet. A method of applying the sealing mechanism of the circular water tank according to (3), wherein the device is inflated into a ring shape,
Is to provide.

  By using the sealing mechanism of the circular water storage tank according to the present invention, when renovating or repairing the roof of the circular water storage tank composed of the cylindrical main body and the roof, a circular installed on the upper part of the main body in order to hermetically protect the water storage space. The peripheral portion of the sealing sheet can be easily and simply adhered to the inner wall of the main body, the water storage space is reliably protected, and the roof portion can be safely constructed. Further, a flexible sheet hollow tube annular body in which the peripheral edge portion of the circular sealing sheet is brought into close contact with the inner wall of the main body is cut at both ends of the cylindrical shape by a plane not orthogonal to the central axis of the cylindrical shape, and a plane including the central axis By forming a plurality of cylindrical hollow tubes that are plane-symmetric with respect to each other so that the longest busbar and the shortest busbar are connected to each other, gas is passed through the hollow tube annular body made of flexible sheet. When the foam is injected and expanded, it smoothly becomes an annular shape, and the peripheral edge of the sealing sheet can be pressed against the inner wall of the main body without manpower.

The sealing mechanism of the circular water storage tank of the present invention is a sealing mechanism of a circular water storage tank comprising a circular sealing sheet and a flexible sheet hollow tube annular body constructed on the upper part of the main body of the circular water storage tank. Is larger than the diameter of the circular water storage tank, the peripheral edge of the circular sealing sheet is locked to the upper inner surface of the circular water storage tank, and the hollow tube annular body made of flexible sheet has a gas filling port to press-fit and expand the gas. In this state, the outer periphery of the hollow tube annular body made of the flexible sheet contacts the inner periphery of the circular water storage tank via the circular sealing sheet, and the hollow body annular body made of the flexible sheet has a plurality of cylindrical shapes. The hollow tubes are connected to each other, and each cylindrical hollow tube to be connected is cut at a plane where both ends of the cylinder are not orthogonal to the central axis of the cylindrical shape, Longest busbar of multiple cylindrical hollow tubes Fine as shortest busbars are continuous respectively, a shape in which a plurality of cylindrical hollow tube are connected. In the present invention, the term “sealed” means a state in which foreign matters such as dust are prevented from entering the stored water, and does not mean an airtight state.
FIG. 1 is a plan view showing an expanded state of one embodiment of a hollow sheet annular body made of a flexible sheet used in the present invention, and FIG. 2 is an end face of an AA line cutting portion of the hollow tube annular body. It is explanatory drawing which shows the side surface of a gas filling port, and the side surface of a lashing tape. The flexible sheet hollow tube annular body of the embodiment shown in FIG. 1 has two gas filling ports 1 and 18 lashing tapes 2. When gas is blown from the gas filling port to expand the flexible sheet hollow tube, the flexible sheet hollow tube annular body is in the state shown in FIG.

3-10 is explanatory drawing of the one aspect | mode of the application method of the sealing mechanism of the circular water storage tank of this invention. A hollow sheet annular body made of a flexible sheet is secured to the peripheral edge of the circular sealed sheet with a securing tape, and the sealed sheet is wound linearly. As shown in FIG. 3, manholes 5 are opened in two places facing the roof portion 4 of the circular water storage tank 3 to be constructed. A pull-in rope 7 is attached to the end of the enclosed sealing sheet 6, and the sealing sheet is lifted by a suspension rope 8. A diver 9 entering the circular water tank from the manhole receives the pull-in rope and carries it to the manhole facing the end of the pull-in rope. Instead of divers, an inflatable boat can be entered from the manhole and can be worked on.
As shown in FIG. 4, the pulling rope 7 carried to the facing manhole is pulled out from the manhole. Next, as shown in FIG. 5, the sealing sheet 6 wound linearly is drawn into the circular water storage tank by pulling out the drawing rope from the manhole. The air supply hose 10 is attached to one gas filling port of the hollow tube made of flexible sheet, and the sealed sheet is completely drawn into the circular water storage tank. Further, as shown in FIG. 6, an air supply hose 10 is attached to the other gas filling port of the flexible sheet hollow tube annular body, and gas is fed from the two gas filling ports.
As shown in FIG. 7, the flexible sheet-made hollow tube annular body expands and expands due to the introduction of gas, and the sealing sheet 6 secured to the flexible sheet hollow-tube annular body is flexible. It spreads in the circular water storage tank 3 together with the hollow tube annular body made of a conductive sheet. When the hollow sheet annular body made of the flexible sheet is completely expanded into the ring shape shown in FIG. 1, the sealing sheet 6 is completely opened as shown in FIG. 8, and the peripheral portion of the sealing sheet is the flexible sheet. The hollow tube annular body is pressed against the inner wall of the circular water storage tank. In this state, air supply to the hollow tube annular body made of the flexible sheet is stopped.

Next, as shown in FIG. 9, perforations 11 are opened on the outer periphery of the roof portion in order to perform the bolting operation of the sealing sheet. As shown in FIG. 10, the bolt part of the sealing sheet is fixed with two ropes 12 and the operator gets on the gondola crane 13, opens a bolt hole on the wall surface of the circular water storage tank, and attaches the sealing sheet and the presser plate to the bolt. Insert the bolts into the bolt holes on the wall, and tighten the nuts from the outside of the circular water storage tank.
FIG. 11 is an explanatory diagram of a method of fixing the sealing sheet with bolts. The presser plate 15 and the sealing sheet 14 are inserted, the bolts 16 are inserted into the bolt holes in the wall surface, and the nuts 18 are screwed from the outside of the circular water storage tank 17 and fastened. In order to increase the strength, the bolt insertion portion at the end of the sealing sheet is preferably folded back to be double as shown in the figure. Although there is no restriction | limiting in particular in the material of a holding plate, In order to avoid damage to a sealing sheet, it is preferable to use engineering plastics, such as an aramid resin. After the work of fixing the sealing sheet with the bolts is completed, the peripheral sheet is tightly attached to the inner wall of the main body by supplying air to the flexible sheet hollow tube annular body 19 to increase the internal pressure and inflating it. Can be made. According to the sealing mechanism of the circular water storage tank of this aspect, the surface of the sealing sheet exists below the bolting position, and the peripheral edge of the sealing sheet is formed by a flexible sheet hollow tube annular body. Since it is pressed against the inner wall, it has an excellent effect of preventing dust and the like from entering the stored water.

When applying the sealing mechanism of the circular water storage tank of the present invention, it is preferable to provide a ventilation tube in the sealing sheet. When the sealing mechanism of the circular water storage tank of the present invention is applied, the peripheral edge of the sealing sheet is almost tightly sealed to the inner wall of the main body of the circular water storage tank, so by providing a ventilation tube on the sealing sheet, Thus, air can enter and exit from the ventilation tube, and the space between the sealing sheet and the water storage surface can be maintained at atmospheric pressure. There is no particular restriction on the structure of the ventilation tube. For example, one end of a tube made of flexible sheet is attached to the hole made in the sealing sheet, and the other end is taken out of the circular water storage tank to prevent intrusion of foreign substances such as dust. The opening can be faced down to prevent. If necessary, a filter for preventing entry of foreign matter can be provided in the ventilation tube.
The hollow sheet annular body made of a flexible sheet used in the present invention has a shape in which a plurality of cylindrical hollow tubes are connected, and each cylindrical hollow tube to be connected has cylindrical ends at the ends. Cut along a plane that is not orthogonal to the central axis of the cylindrical shape, is plane-symmetric with respect to one plane including the central axis, and the longest busbar and the shortest busbar of each of the plurality of cylindrical hollow tubes are continuous. A shape in which a plurality of cylindrical hollow tubes are connected. The hollow sheet annular body made of a flexible sheet used in the present invention does not need to be joined from the state where all the individual cylindrical hollow tubes are separated from each other, for example, a plurality of cylindrical hollow tubes continuous in a band shape. Can be made into a hollow sheet annular body made of a flexible sheet having a shape in which a plurality of cylindrical hollow tubes are connected.

FIG. 12 is an explanatory diagram of the shape of a cylindrical hollow tube used in the present invention. The cylindrical hollow tube 20 used in the present invention has an elliptical shape 24 by cutting both ends of a cylindrical shape by planes 22 and 23 that are not orthogonal to the central axis 21 of the cylindrical shape, with respect to one plane including the central axis. The plane of symmetry is such that one intersection line between the symmetry plane and the cylindrical surface is the longest bus line 25, and the other intersection line between the symmetry plane and the cylindrical surface is the shortest bus line 26. The hollow sheet annular body made of a flexible sheet used in the present invention has a plurality of cylindrical hollow tubes connected so that the longest busbar and the shortest busbar of the plurality of cylindrical hollow tubes are continuous. Have a different shape. The cylindrical hollow tube used in the present invention is preferably plane-symmetric with respect to a plane perpendicular to the central axis. When the cylindrical hollow tube is plane-symmetric with respect to a plane perpendicular to the central axis, the cut surfaces at both ends of the cylindrical shape are the same ellipse, so that a plurality of cylindrical hollow tubes can be easily connected. Can do.
By connecting a plurality of cylindrical hollow tubes whose ends shown in FIG. 12 are cut by a plane that is not perpendicular to the cylindrical central axis, the outer periphery and the inner periphery shown in FIG. A sheet hollow tube annular body can be formed. When a hollow sheet annular body made of a flexible sheet having a polygonal outer circumference and inner circumference shown in FIG. 1 is placed in a circular water storage tank and inflated by blowing gas, the hollow pipe annular body made of a flexible sheet Naturally forms an annulus and adheres to the wall of the circular water tank.

FIG. 13 is an explanatory diagram of a flexible sheet hollow tube annular body that has been conventionally used. Conventionally, both ends of a long cylindrical hollow tube made of a flexible sheet are connected to produce an annular body made of a flexible sheet. When this flexible sheet-made hollow tube annular body 27 is put into a circular water storage tank 28 and blown to inflate gas, the flexible sheet-made hollow tube annular body does not become an annular shape but is flexible. A gap 29 is formed between the sheet hollow tube annular body and the wall surface of the circular water storage tank. Therefore, conventionally, when a gas is blown into a flexible sheet hollow tube annular body to be expanded, an operator is arranged around the circular water storage tank to expand, and the flexible sheet hollow tube annular body expands. Had to be pulled to the wall of the circular water tank. By applying the sealing mechanism of the circular water storage tank of the present invention and using a flexible sheet hollow tube annular body whose outer periphery and inner periphery are polygonal, a flexible sheet hollow tube annular body that expands is Since it forms a natural ring and is in close contact with the wall surface of the circular water storage tank, the number of man-hours required for the expansion work of the circular sealing sheet can be reduced and the expansion work can be rationalized.
The hollow sheet annular body made of a flexible sheet used in the present invention has a shape in which 15 to 60 cylindrical hollow tubes having both ends cut by a plane not orthogonal to the central axis of the cylinder are connected. It is more preferable that 20 to 40 cylindrical hollow tubes are connected to each other. If the number of connected cylindrical hollow tubes is less than 15, the expanded flexible sheet hollow tube ring does not adhere to the wall surface of the circular water storage tank, and the flexible sheet hollow tube ring There may be a gap between the body and the wall of the circular water tank. The number of cylindrical hollow tubes to be connected is 60 or less, the expanded flexible sheet hollow tube annular body is in close contact with the wall surface of the circular water storage tank, and the number of cylindrical hollow tubes to be connected is 60. If the number is exceeded, the man-hours for producing the flexible sheet hollow tube annular body may increase unnecessarily.

  In the flexible sheet hollow tube annular body used in the present invention, it is preferable that the sum of the longest busbars of the connected cylindrical hollow tubes is substantially equal to the inner periphery of the wall surface of the circular water storage tank. By making the sum of the longest busbars of the connected cylindrical hollow tubes substantially equal to the inner circumference of the wall surface of the circular water storage tank, the flexible sheet hollow tube annular body is formed in a state where the gas is press-fitted and expanded. The outer periphery can be brought into contact with the inner periphery of the circular water storage tank via the circular sealing sheet. The cross section obtained by cutting both ends of the cylindrical hollow tube to be connected with a plane is preferably symmetrical with a plane perpendicular to the central axis as a plane of symmetry. It is preferable that an angle formed by two planes cutting both ends of the connected cylindrical hollow tubes is substantially equal to a quotient obtained by dividing 360 degrees by the number of connected cylindrical hollow tubes. That is, when the number of cylindrical hollow tubes to be connected is 15, it is preferably approximately 24 degrees, when it is 30, it is approximately 12 degrees, and when it is 60, it is preferably approximately 6 degrees. The gas was press-fitted and expanded by making the angle formed by the two planes cutting both ends of the connected cylindrical hollow tubes approximately equal to the quotient obtained by dividing 360 degrees by the number of connected cylindrical hollow tubes. In this state, the outer periphery of the flexible sheet hollow tube annular body can be brought into contact with the inner periphery of the circular water storage tank via the circular sealing sheet.

In the method for producing a hollow sheet annular body made of a flexible sheet for a sealing mechanism of a circular water storage tank according to the present invention, two rims connecting both side edges to 15 to 60 places in the longitudinal direction of a strip-like flexible sheet. After forming a notch formed of a substantially sinusoidal curve and joining the flexible sheets adjacent to the notch, both side edges of the belt-like flexible sheet are joined to form a hollow tube.
FIG. 14 is an explanatory view of two modes of the method for producing a hollow sheet annular body made of a flexible sheet of the present invention. In FIG. 14A, a strip-shaped flexible sheet 30 is formed with a notch 31 formed of two sine curves connecting both side edges, and the sine curve is formed on both side edges 32 having a band width of 0. The maximum value of the amplitude is located at the center 33 of the belt shape. In FIG. 14B, a notch 34 formed of two sine curves connecting both side edges is formed in the strip-shaped flexible sheet 30. The sine curve has an amplitude of 0 at the center 33 of the strip. Is located on both side edges 32 of the belt.
In the method of the present invention, after joining the flexible sheets adjacent to the notch formed by two sinusoids connecting both side edges, the both side edges are joined to form a hollow tube, and the ends of the hollow tubes are joined. To form an annular body. By forming the notch with two approximately sinusoidal curves that connect both side edges, when both side edges are joined to form a hollow tube, the end of each cylindrical hollow tube becomes elliptical and the form is stable A hollow sheet annular body made of a flexible sheet can be produced. In the embodiment shown in FIG. 14 (a), both side edges of the strip-shaped flexible sheet are the longest generatrix of the cylindrical hollow tube, and the center line of the strip-shaped flexible sheet is the shortest of the cylindrical hollow tube. Become a bus. In the embodiment shown in FIG. 14 (b), both side edges of the strip-shaped flexible sheet are the shortest generatrix of the cylindrical hollow tube, and the center line of the strip-shaped flexible sheet is the longest of the cylindrical hollow tube. Become a bus.

Examples of the flexible sheet used in the present invention include rubber-drawn cloth and plastic-drawn cloth. There is no restriction | limiting in particular in the material of the base fabric of a rubber | gum pulling cloth or a plastics pulling cloth, For example, a cotton fabric, a polyester fabric, a polyamide fabric etc. can be mentioned. There is no particular limitation on the rubber material of the rubberized cloth used in the present invention. For example, natural rubber, isoprene rubber, styrene-butadiene rubber, butadiene rubber, chloroprene rubber, nitrile-butadiene rubber, hydrogenated nitrile-butadiene rubber, EPDM elastomer And so on. There is no restriction | limiting in particular in the material of the plastic of the plastic pulling cloth used for this invention, For example, a polyurethane, a polyvinyl chloride, an ethylene-vinyl acetate copolymer etc. can be mentioned. Among these, the plastic pulling cloth can be preferably used because it can be fused, and the polyurethane pulling cloth can be particularly preferably used.
Although there is no particular limitation on the size of the circular water tank that can be used for repairing or repairing the roof by applying the sealing mechanism of the circular water tank of the present invention, the diameter is 10 to 40 m and the capacity is 1,000 to 10. It can be suitably applied to the construction of a circular water storage tank of 1,000,000 m ³ . The diameter of the hollow tube of the hollow sheet made of flexible sheet used in the present invention when expanded is preferably 150 to 500 mm, more preferably 220 to 400 mm. If the diameter of the hollow tube when expanded is less than 150 mm, the force for pressing the peripheral edge of the sealing sheet against the inner wall of the main body of the circular water storage tank may be insufficient. If the diameter of the hollow tube at the time of expansion exceeds 500 mm, the work in the tank may be hindered.

  By using the sealing mechanism of the circular water storage tank according to the present invention, when renovating or repairing the roof of the circular water storage tank composed of the cylindrical main body and the roof, a circular installed on the upper part of the main body in order to hermetically protect the water storage space. The peripheral portion of the sealing sheet can be easily and simply adhered to the inner wall of the main body, the water storage space is reliably protected, and the roof portion can be safely constructed. Further, a flexible sheet hollow tube annular body in which the peripheral edge of the circular sealing sheet is in close contact with the inner wall of the main body is cut at a cylindrical end at a plane not orthogonal to the central axis of the cylindrical shape. By forming a plurality of cylindrical hollow tubes that are plane-symmetric with respect to two planes so that the longest busbar and the shortest busbar are connected to each other, a hollow tube annular body made of a flexible sheet When a gas is injected into the tube and inflated, the ring is smoothly formed into an annular shape, and the peripheral edge of the sealing sheet can be pressed against the inner wall of the main body without manpower.

It is a top view of the one aspect | mode of the hollow tube annular body made from a flexible sheet used for this invention. It is explanatory drawing of the hollow pipe | tube annular body made from a flexible sheet | seat of FIG. It is explanatory drawing of the one aspect | mode of the application method of the sealing mechanism of the circular water storage tank of this invention. It is explanatory drawing of the one aspect | mode of the application method of the sealing mechanism of the circular water storage tank of this invention. It is explanatory drawing of the one aspect | mode of the application method of the sealing mechanism of the circular water storage tank of this invention. It is explanatory drawing of the one aspect | mode of the application method of the sealing mechanism of the circular water storage tank of this invention. It is explanatory drawing of the one aspect | mode of the application method of the sealing mechanism of the circular water storage tank of this invention. It is explanatory drawing of the one aspect | mode of the application method of the sealing mechanism of the circular water storage tank of this invention. It is explanatory drawing of the one aspect | mode of the application method of the sealing mechanism of the circular water storage tank of this invention. It is explanatory drawing of the one aspect | mode of the application method of the sealing mechanism of the circular water storage tank of this invention. It is explanatory drawing of the fixing method with the volt | bolt of a sealing sheet. It is explanatory drawing of the shape of the cylindrical hollow tube used for this invention. It is explanatory drawing of the flexible sheet-made hollow tube annular body used conventionally. It is explanatory drawing of 2 aspects of the manufacturing method of a hollow tube annular body made from a flexible sheet. It is explanatory drawing of the repair method of the conventional circular water tank. It is explanatory drawing of the joining state of a sealing sheet and a tank main body inner wall.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas filling port 2 Tightening tape 3 Circular water storage tank 4 Roof part 5 Manhole 6 Sealing sheet 7 Pull-in rope 8 Hanging rope 9 Diver 10 Air supply hose 11 Perforation 12 Rope 13 Gondola crane 14 Sealing sheet 15 Holding plate 16 Bolt 17 Circular water storage Tank 18 Nut 19 Flexible sheet hollow tube annular body 20 Cylindrical hollow tube 21 Central axis 22 Plane 23 Plane 24 Ellipse 25 Longest busbar 26 Shortest busbar 27 Flexible sheet hollow tube annular body 28 Circular water storage tank 29 Clearance 30 Band-shaped flexible sheet 31 Notch 32 Band-shaped side edges 33 Band-shaped center 34 Notch 35 Main body 36 Roof 37 Circular water tank 38 Sealed sheet 39 Temporary tension structure 40 Side wall 41 Anchor bolt 42 Presser plate 43 Screw bolt

Claims (4)

  A circular water storage tank sealing mechanism comprising a circular airtight sheet and a flexible sheet hollow tube annular body laid on the upper part of the main body of the circular water storage tank, wherein the diameter of the circular airtight sheet is larger than the diameter of the circular water storage tank, Flexible sheet hollow in a state where the peripheral edge of the circular sealing sheet is locked to the upper inner surface of the circular water storage tank, the flexible sheet hollow tube annular body has a gas filling port, and the gas is press-fitted and expanded. The outer periphery of the tubular annular body is in contact with the inner periphery of the circular water storage tank via the circular sealing sheet, and the hollow tubular annular body made of a flexible sheet has a shape in which a plurality of cylindrical hollow tubes are connected. Each cylindrical hollow tube is cut at a plane where both ends of the cylindrical shape are not orthogonal to the central axis of the cylindrical shape and is plane-symmetric with respect to one plane including the central axis. The longest busbar and the shortest busbar of the hollow tube are continuous. , Sealing mechanism of a circular water tank, which is a shape in which a plurality of cylindrical hollow tube are connected.   After forming a notch consisting of two substantially sinusoids connecting both side edges at 15-60 locations in the longitudinal direction of the belt-like flexible sheet, and joining the flexible sheets adjacent to the notch, The method for producing a hollow sheet annular body made of a flexible sheet for a sealing mechanism of a circular water storage tank according to claim 1, wherein both side edges of the belt-shaped flexible sheet are joined to form a hollow tube. The method for applying the sealing mechanism of the circular water tank according to claim 1 to the water tank, wherein the roof of the circular water tank faces the roof of the water tank comprising a cylindrical main body and a roof. Open a manhole in two places, pull the tip of a circular sealing sheet having two gas filling ports linearly wound from one of the manholes, and carry it to the other manhole facing the manhole. By injecting gas from the gas filling port of the flexible sheet, the hollow tube annular body made of flexible sheet is expanded into a ring shape, so that the circular sealing sheet is completely opened, and the peripheral edge of the circular sealing sheet is made of flexible sheet. A method of applying a sealing mechanism of a circular water tank to a water storage tank, wherein the circular water tank is pressed against a wall of the circular water tank by a hollow tube annular body. Attach a pull-in rope to the tip of the circular sealed sheet wrapped in a straight line, pull the pull-in rope from one manhole, carry it to the other manhole facing it, and pull out the pull-in rope from the other manhole, Pull the linear sealing sheet wrapped in a straight line into the water storage tank and feed the gas from the gas filling ports at both ends of the circular sealing sheet wrapped in a straight line to wrap the sealing sheet fixing auxiliary tool of the circular sealing sheet. 4. A method of applying a sealing mechanism of a circular water tank according to claim 3 to the water tank.

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