JP2001171788A - Roof section modifying method for tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roof section modifying method for a tank by which an already existing roof section can be modified or disassembled while utilizing the tank. SOLUTION: A sealing sheet 12 which does not emit a substance to deteriorate the water quality even when coming into contact with water is bridged in a manner to seal a storage space U on the top of stored water W. Then, in the storage space above the sealing sheet 12, a temporarily provided tensile structure 21 which shuts off a dropping object O to damage the sealing sheet 12 is bridged. A communicating section 13 which communicates with the storage space U sealed by the sealing sheet 12 with the outside air is connected to the sealing sheet 12 by penetrating the bridged temporarily provided tensile structure 21. Then, the already existing roof section 5 is modified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roof repair method for repairing an existing roof of a tank for storing water, for example, water for drinking or industrial use, that is, a so-called water storage tank.

[0002]

2. Description of the Related Art Conventionally, a water storage tank is often constructed of a prestressed concrete (hereinafter referred to as "PC") tank, and a tank body and a roof erected on the top of the tank body. It is composed of a part and a part. The tank body has a circular bottom plate and a cylindrical side wall formed in an annular shape in plan view having a required thickness and standing on the periphery of the bottom plate. It is configured to have a storage space for storing. The side walls are made of PC, and PC steel materials are arranged in the vertical and horizontal directions in the concrete. The roof is a dome-shaped roof in which a reinforced concrete (hereinafter referred to as “RC”) roof plate (slab) integrated with the tank body is formed in a dome shape.

[0003] Next, since the roof shingle of the roof has a thin concrete section thickness (usually about 10 cm in general) and reinforcing bars arranged, it is not possible to properly secure the cover thickness of the reinforcing bars. When exposed to a chlorine atmosphere from tap water, the concrete deteriorates with time, and the durability may be poor. Therefore, if the service life of the roof of the RC structure is shorter than the service life of the tank body, the entire tank must be demolished even though the tank body itself can still be used, which is uneconomical. Therefore, there is a demand for a repair method in which the existing roof is repaired and reused, or dismantled and replaced with a new roof to reuse the tank body, and various repair methods have been proposed. This is a method of temporarily resuming, suspending, and repairing the use (operation).

[0004]

However, if the stored water in the tank is, for example, for drinking, the drinking water is used and used every day, and when there is only one tank,
If you stop or stop using the tank, you will not be able to supply water.
So, while using the tank, the existing roof can be repaired and reused without deteriorating the quality of the stored water.
Alternatively, there is a demand for a repair method in which the tank is dismantled and replaced with a new roof part to reuse the tank body.

SUMMARY OF THE INVENTION The present invention has been made in order to meet the above-mentioned demands, and is capable of repairing and dismantling an existing roof portion while using a tank without deteriorating the quality of stored water. It provides a roof renovation method.

[0006]

The invention of claim 1 is a method for repairing a roof of a tank for repairing an existing roof of a tank, wherein the tank is in contact with water so as to seal a storage space above the storage water. A temporary closed structure that does not release substances that degrade water quality is installed, and a temporary tension structure that blocks falling objects that damage the temporary closed structure is installed in the storage space above the temporary closed structure. Later, the existing roof will be repaired.

According to a second aspect of the present invention, in the method for repairing a roof portion of a tank according to the first aspect, the temporary closed structure and the temporary tension structure are made of a lightweight and flexible material, and the opening of the tank is provided. It is a method of assembling in the storage space after loading from the storage space. According to a third aspect of the present invention, in the method for repairing a roof portion of a tank according to the first or second aspect, the temporary sealed structure is provided with a sealing sheet for sealing a storage space above the storage water and a storage sealed with the sealing sheet. This is a method in which the space is made up of a communicating portion for ventilating the outside air, the peripheral edge is joined to the side wall of the tank, a sealing sheet is erected, and one end of the communicating portion is connected to the sealing sheet.

According to a fourth aspect of the present invention, there is provided the method for repairing a roof portion of a tank according to the third aspect, wherein the communication portion is connected to the sealing sheet by penetrating the erected temporary tension structure. According to a fifth aspect of the present invention, in the method for repairing a roof portion of a tank according to the third or fourth aspect, a substance floating on storage water as a scaffold on which a sealing sheet is erected is not released even if it comes into contact with water. This is a method using a boat.

The invention according to claim 6 is the invention according to claims 3 to 5.
In one of the tank roof repair methods, the sealing sheet is suspended from the temporary tension structure by a plurality of suspension members. According to a seventh aspect of the present invention, in the method for repairing a roof portion of a tank according to any one of the first to sixth aspects, the erected tension structure is constituted by a tension structure member and a falling object blocking member, This is a method in which an end portion is joined to a side wall of a tank or an existing roof portion, a tension structure member is erected, and a falling object blocking member is disposed above the tension structure member.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The features of the present invention will be briefly described by taking a temporary roof structure of a tank shown in FIG. 1 as an example. FIG.
FIG. 1 is an explanatory view showing a temporary roof structure used in a tank roof repair method according to a first embodiment of the present invention.

An object of the present invention is to make it possible to repair and dismantle an existing roof 5 while a tank T for storing water (drinking water such as tap water and well water, industrial water) is operated. And Therefore, the temporary roof structure K
Replaces the existing roof part 5 during the construction period and
It is a prerequisite that the water quality does not deteriorate. further,
It is desirable to use a material or a structure that can carry in the material using the opening (5a) of the existing roof portion 5 and perform assembling work in the narrow space of the storage space U with human power. Since the work in the storage space U is performed while using, for example, a boat floating on the surface of the storage water W as a work scaffold, the temporary roof structure K is made of a material that is lightweight, flexible, and has high tensile strength. It is preferable that the tension structure is formed in a flat manner in the storage space U.

In view of this, the temporary roof structure K is used to seal the storage space U above the storage water W and to release the substance that deteriorates the water quality even when the storage space W is in contact with the storage water W (the first temporary structure). Roof means) 11 and the temporary sealed structure 1
1 and a temporary tension structure (second temporary roof means) 21 that blocks a falling object O that damages the temporary sealed structure 11 and is installed in the storage space U above the storage space U. Note that the upper and lower positional relations are in the order of the existing roof part 5, the temporary tension structure 21, the temporary closed structure 11, and the storage water W.

The above-mentioned existing roof part 5 is formed as a dome-shaped roof by a roof slab (slab) made of RC, but is stored on the lower surface with a structure supporting vertical loads such as its own weight and work load interposed therebetween. The function of sealing the space U and the function of the roofing material on the upper surface are integrally provided in a sandwich shape. By disassembling the function of the existing roof 5, the temporary roof structure K provides the temporary closed structure 11 with a function of sealing the storage space U and a function of a roofing material,
The temporary tension structure 21 has a structure function. Furthermore, a thin sheet-shaped sealing sheet 1 is attached to the temporary sealing structure 11.
Since the sealing sheet 12 is used, it is required that the sealing sheet 12 be made of a material that does not release a substance that deteriorates the water quality even when the sealing sheet 12 comes into contact with the stored water W. It is required to block the falling object O that damages 11.

The temporary sealing structure 11 has a function of sealing the storage space U and a function of a roofing material. Since the sealing function is a function of sealing the space above the water surface, the tank main body 1 of the tank T and the temporary sealing structure 11
Means the inner surface of the container that is in direct contact with the stored water W. In addition, the function of the roofing material is a function of preventing solid substances (falling objects) O such as concrete fragments, dust, muddy water, and rainwater R from dropping and entering the storage water W when the existing roof portion 5 is dismantled. is there. For this reason, the temporary sealed structure 11 is
And a communication portion 13 for ventilating the storage space U sealed by the sealing sheet 12 to the outside air.

The temporary tension structure 21 has a function of supporting a vertical load such as its own weight and a work load, and a function of blocking falling objects. The structure function supports not only the vertical load applied to the temporary tension structure 21 but also the vertical load applied to the temporary closed structure 11 if necessary, and reduces the strength required for the sealing sheet 12. is there. In addition, the falling object blocking function is to remove solid objects O such as concrete debris which may damage the sealing sheet 12 by using the sealing sheet 1.
2 and a function to keep the safety of workers from falling down. For this reason, it is desirable that the temporary tension structure 21 be composed of a tension structure member 22 provided on the plane of the storage space U and a falling object blocking member 23 disposed above the tension structure member 22. .

The temporary roof structure K is a temporary closed structure 11
And a temporary tension structure 21, which is a protection means for shutting off the space between the existing roof 5 and the storage water W. Therefore,
According to the present invention, the existing roof 5 is repaired or dismantled and replaced with a new roof, and the tank body 1 is re-used while using the tank T without deteriorating the quality of the stored water W. Can be used.

Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, a tank T for storing water for drinking or industrial use includes a bottom plate 2 and a bottom plate 2.
A tank body 1 comprising a side wall 3 having an annular planar shape having a required wall thickness and being erected around the peripheral edge of the tank; And the existing roof 5. Although not shown, the existing roof 5 is provided with an opening (5a) as an inspection hole or a work hole for maintenance and inspection. The tank T will be described as being made of PC.

Temporary closed structure (first temporary roof means) 11
Is a sealing sheet 12 for sealing the storage space U above the storage water W to prevent the solid matter O, dust, turbid water, rainwater R, etc. from being mixed into the storage water W, and a storage sealed with the sealing sheet 12. The communication unit 13 is configured to communicate the space U with outside air (outside).

The above-mentioned sealing sheet 12 is required to be a material and a material that maintains the water quality without releasing harmful substances and dusts even when it comes into direct contact with the storage water W. Any material can be maintained as long as it can be maintained. For example, a material and a material conforming to the Water Supply Law, the Food Sanitation Law, and the like are preferable, but are not necessarily limited. The sealing sheet 12 is made of a material having a waterproof property and a required strength so as to have a good structure for raining in order to exhibit the function of a roofing material.

The sealing sheet 12 is formed as a thin sheet material made of a thermoplastic material such as natural rubber, synthetic rubber, or a thermoplastic resin (eg, polyethylene, polystyrene, polypropylene, polyvinyl chloride, etc.). . For example, a thermoplastic plastic obtained by copolymerizing ethylene and vinyl acetate is a non-toxic and flexible resin that does not contain chlorine or plasticity, and is a standard for food additives and the like defined based on Article 10, Paragraph 1 of the Food Sanitation Act. Standard (Ministry of Health and Welfare Notification No. 3
No. 70), and can be used for food, drink and drinking water containers.

The sealing sheet 12 is formed as a single large sheet that closes the storage space U above the storage water W by using a thin sheet-shaped member having a predetermined material. The membrane structure is fixed and supported on the tank body 1 (side wall 3). And the sealing sheet 1
2 is configured so as to conform to the planar shape of the storage space U, and the peripheral edge is fixed to the side wall 3. Even if a single large sheet closes the storage space U, a plurality of divided sheet pieces are stored in the tank T. Then, for example, it may be joined by a fastener or the like.

Further, the sealing sheet 12 is provided with an opening 12a for connecting the communication portion 13, and a kiln 12b for drainage is provided at a central portion. Further, a work opening (12c), which can be opened and closed by a fastener or the like, which allows a boat described later to be taken in and out, is provided at a predetermined position. Furthermore, although the sealing sheet 12 is formed in a substantially horizontal plane above the storage water W in a plane shape that matches the internal shape of the storage space U, any sheet that closes the space above the storage water W may be used. May be arranged so as to be inclined with respect to.

Since the highest water level of the storage water W rises and falls in the storage space U, the communicating portion 13 is connected to the sealing sheet 12 in order to maintain the same pressure difference between the sealed storage space U and the outside air. It is desirable to attach. And the communication part 13
Devise the structure, arrangement location, and number of arrangements so that the storage space U can be ventilated as water enters and exits, and dust, turbid water, and the like can be prevented from entering the storage water W.

The communicating portion 13 is formed of the same material as the sealing sheet 12 and is formed in a cylindrical shape. One open end is detachably joined to the sealing sheet 12 by, for example, a fastener, and the other open end is joined. Is extended to the outside of the tank body 1 so as to prevent dust from entering the storage space U, and is directed downward. Therefore, during the construction, the direction of the wind can be observed, and the communication portion 13 can be moved so that dust does not enter from the open end.

Next, the joint between the sealing sheet 12 and the tank T will be described. In FIG. 5, reference numeral 41 denotes an anchor bolt partially embedded in the side wall 3, reference numeral 42 denotes a bolt screwed into the anchor bolt 41, reference numeral 43 denotes a holding plate through which the anchor bolt 41 is inserted, and an anchor bolt 41.
And the bolt 42 constitute a fastener. This fastener is
The peripheral portion of the sealing sheet 12 is fixed to the side wall 3. In addition, the anchor bolt 41 to the holding plate 43
Is preferably made of stainless steel or synthetic resin in consideration of corrosion resistance.

Since the sealing sheet 12 has a film structure that resists a vertical load such as its own weight by its own tensile strength, a tensile force acting on the sealing sheet 12 is applied to the joint at the peripheral portion thereof on the side wall 3. It is transmitted as a tensile force that acts substantially perpendicularly to it. Therefore, the joining portion of the peripheral portion of the sealing sheet 12 only needs to transmit the tensile force, and may be a fastener having another configuration. When joining the peripheral portion of the sealing sheet 12 to the side wall 3, a predetermined tension may be applied so that the sealing sheet 12 is not excessively loosened.

In FIG. 1, a temporary tension structure (second temporary roof means) 21 is a tension structure member 2 constituting a tension structure.
2 and a falling object blocking member 23. Further, the tension structure member 22 has a support function of supporting a work load of an operator or the like and / or a vertical load of the temporary closed structure 11, particularly, the closed sheet 12 via a suspending member 31 described later.

The above-mentioned tension structural member 22 is a structural member in which a material excellent in light weight, flexibility, tensile strength and workability, for example, a high-tensile chemical fiber (aramid fiber) is formed in a band-shaped sheet member or a rod-shaped member. . This tension member 22
Is carried in from the opening (5a) of the existing roof part 5, is laid on a horizontal plane in the space above the sealing sheet 12, and its end is fixed to the tank T (side wall 3 or the existing roof part 5). Then, as shown in FIG. 3, a plurality of tension structure members 22 are arranged at predetermined intervals in a lattice shape in plan view according to the planar shape of the storage space U, thereby forming a tension structure (tension structure). The tension structure means that a vertical load (self-weight, work load, etc.) applied to the tension structure member 22 is supported by a tensile strength of the tension structure member 22 at a fulcrum (a joint between the material end of the tension structure member 22 and the tank T). Structure to transmit to.

In FIG. 1, the tension structure member 22 is installed on a substantially horizontal plane above the sealing sheet 12 in a plane shape conforming to the internal shape of the storage space U. However, the tension structure member 22 may be installed in the lateral direction of the storage space U and form a tension structure supported and fixed to the existing roof 5 (or the side wall 3). For example, the tension structure member 22 is inclined with respect to a horizontal plane. The storage space U may have a curved shape having a downwardly convex portion at the center in the storage space U. The horizontal spacing between the plurality of tension members 22 is determined by the plane shape of the storage space U, the tensile force acting on the tension members 22, the structure of the joint between the tension member 22 and the tank T, and the falling object blocking member 23. It is set in consideration of the span length that supports.

Next, the joint between the tension member 22 and the tank T will be described with reference to FIG. In FIG. 5, reference numeral 5 b denotes a through hole, which is provided in a portion close to the side wall 3 of the existing roof 5 at an appropriate interval in the circumferential direction corresponding to the planar arrangement of the tension structural members 22. Reference numeral 51 denotes an anchor bolt serving as a fastener, a part of which is embedded in the side wall 3 located outside the storage space U corresponding to the through hole 5b, and the tension structure member 2 is provided.
The two ends are attached and secured.

Since the tension structure member 22 constitutes a tension structure that resists a vertical load such as its own weight by its own tensile strength, a tensile force acting in the material axis direction of the tension structure is applied to the joint at the end thereof. It also acts on the roof 5 (or the side wall 3) as a lateral force (substantially horizontal force). Therefore,
The joint at the end of the tension structure member 22 may be any fastener that transmits this lateral force, and may be a fastener having another structure. For example, instead of the anchor bolt 51 shown in FIG. Shaped fasteners may be used. Furthermore, a joint may be formed on the inner surface of the existing roof 5 (or the side wall 3) without providing the through-hole 5b in the existing roof 5. In addition,
When joining the end of the tension structure member 22 to the tank T, a predetermined tension may be applied so that the tension structure member 22 is not excessively loosened.

Examples of the above-mentioned tension structural member 22 include carbon fibers of high-tensile chemical fibers in addition to aramid fibers. These high-tensile chemical fibers are formed into a band-shaped sheet material or a braid having a predetermined width. It is used as a rod. Further, as the tension structure member 22, a metal material, for example, a piano wire or the like can be used. In addition, the tension structural member 2
The plane arrangement of 2 may be optimal for the horizontal plane shape in the tank T, and may be, for example, radial.

When the existing roof 5 is dismantled, the above-mentioned falling object blocking member 23 is a sieve that blocks falling objects that are solid matters O such as concrete fragments having a size that damages the sealing sheet 12 and the communication part 13. It has a function and also functions as a safety measure to prevent a worker from dropping, and serves as a scaffold for performing work. The fallen object blocking member 23 shown in FIG. 4 is formed of a curing net, and as shown in FIG. 1, an opening 23a that penetrates the communication portion 13 is provided corresponding to the opening 12a. The sealing sheet 12 and the communication section 1
The solid material O that damages the sample 3 is, for example, 10 cm in diameter.
Although concrete fragments of a degree can be cited, the size for sieving the falling object O is preferably 7 cm, and more preferably 5 c
m is desirable.

In FIG. 5, reference numeral 24 denotes a falling object blocking member 23.
2 shows a mounting tool for attaching to the tension structure member 22. In addition,
As the fallen object blocking member 23, in addition to the curing net, a curing wire mesh, a lightweight plate (metal, wooden, resin, etc.) can be used, but when a lightweight plate is used, the weight increases. , Can be used as a scaffold board.

1, 2 and 5, reference numeral 31 denotes a suspending member for suspending the sealing sheet 12 from the tension structure member 22. For example, the lower end is adhered and fixed to the sealing sheet 12, and the upper end is tensioned. It is fixed by being tied to the member 22. Since the tension structural member 22 supports the vertical load applied to the sealing sheet 12, the load applied to the sealing sheet 12 and the load supporting span are reduced, and the sealing sheet 1
2, the strength required is small, and a thin sheet can be used, so that economy and workability are improved. Further, since the tensile force (lateral force) applied to the joint between the peripheral portion of the sealing sheet 12 and the side wall 3 is reduced, the structure of the joint,
The number of installation locations can be reduced. In addition, when the strength of the sealing sheet 12 is increased by increasing the thickness of the small tank T or the thickness, the hanging member 31 is not required.

Next, a method for repairing the tank roof structure will be described. 6 to 12 are explanatory views showing the process of repairing the roof structure. The same reference numerals are given to the same parts as those in FIGS. 1 to 5, and the description will be omitted. In addition, illustration of the communication part 13 is omitted in each figure.

First, as shown in FIG.
Erection. First, the boat B is carried into the storage water W by loading the boat B into the storage space U from the opening 5a of the tank T and introducing air. This boat B is formed of a lightweight and flexible material and structure so that it can be carried in from the opening 5a, and at least a portion in contact with the storage water W is formed of the same material as the sealing sheet 12, and A sheet is attached that does not release any substance that degrades water quality, dust, etc. even if it comes into contact with it. It should be noted that the boat B may be one that is thrown onto the water surface, so that the gas gushes from the cylinder and floats on the water by the impact of landing.

Next, the operator gets on the boat B through the opening 5a and, at the same level in the circumferential direction of the side wall 3 located above the storage water W, at predetermined intervals as shown in FIG. 41 is screwed or engaged. When attaching the anchor bolt 41, it is necessary to cure the concrete pieces and the like so as not to fall into the storage water W.

Then, as shown in FIG. 6, while temporarily holding the folded sealing sheet 12 with a rope, the folded sealing sheet 12 is put into the storage space U through the opening 5a, and the worker on the boat B unfolds the sealing sheet 12. The peripheral portion is attached to the side wall 3 and fixed. Peripheral portion and side wall 3 of this sealing sheet 12
As shown in FIG.
2 is bent downward, the sealing sheet 12 is brought into contact with the side wall 3 by the holding plate 43, and the bolt 42 is screwed into the anchor bolt 41 to fix the peripheral edge of the sealing sheet 12 to the side wall 3. By sequentially performing this operation, the sealing sheet 12 is erected, and the storage space U above the storage water W is sealed.

Next, the worker escapes from the work opening (12c) (not shown) of the sealing sheet 12 and folds the boat B to open the sealing sheet 12 through the work opening (12c).
After being carried out to the upper side of the tank T, it is carried out of the tank T from the opening 5a.

Next, as shown in FIG.
2 is installed in the space above the sealing sheet 12. First, a through hole 5b is opened in a circumferential direction at an appropriate interval at a position close to the side wall 3 of the existing roof portion 5, and an anchor bolt 51 is driven into the side wall 3 corresponding to the through hole 5b. Next, the tension structural member 22 is carried into the storage space U from the opening 5a of the existing roof 5, and both ends are passed through the through-hole 5b.
Tighten to the anchor bolt 51 of the side wall 3. Conversely, the tension structure member 22 may be inserted into the storage space U from the through hole 5b.

A plurality of tension members 22 are arranged in a lattice in a plan view, and the peripheral portion thereof is fixed to and supported by the tank body 1 to form a tension structure. The interval on the plane of the plurality of tension structural members 22 is, for example, 1
m to 2 m [(7 × 2 =) 14 in FIG.
Book], as shown in FIG. 7, the sealing sheet 12 is suspended from the tension structure member 22 using the suspension member 31.

Next, as shown in FIG. 8, the fallen object blocking member 23 is carried into the storage space U through the opening 5a, the fallen object blocking member 23 is laid on the tension structure member 22, and the tension structure member A fallen object blocking member 23 is attached to 22 using a fixture 24 so as not to move.

Then, although not shown, the communication portion 13 is carried in and attached to the sealing sheet 12. The communication unit 13
One end of the opening part 23a and the tension structure member 22 to be closely connected to the sealing sheet 12 on the periphery of the opening 12a, and the other end side of the communication part 13 extends from the opening part 5a to the outside of the storage space U, Communication part 1 located outside tank T
The part 3 is directed downward of the tank T.

In this manner, the provisional sealing structure 11 and the provisional tension structure 21 are provided, and the storage space U above the storage water W is sealed with the sealing sheet 12, and the storage space U sealed with the sealing sheet 12 is sealed. Since the communication portion 13 communicates with the outside of the tank T and the leading end (the other end) of the communication portion 13 faces the lower side of the tank T, dust and the like do not enter the storage water W, and the amount of the storage water W increases and decreases. The pressure in the storage space U can be kept constant.

Next, as shown in FIG. 9, the existing roof part 5 is divided into a predetermined size and dismantled, and is sequentially suspended by the crane C on the ground. Then, as shown in FIG. 10, after dismantling the existing roof 5, the temporary tension structure 21 and the anchor bolt 51 are removed.

Next, as shown in FIG.
Is projected substantially horizontally toward the inside of the storage space U at the top of the side wall 3, and a mounting joint is provided at the tip thereof. Then, the new roof 6 previously manufactured on the ground is lifted by the crane C and placed on each mounting joint on the cantilever member 4, and the new roof 6 is connected to each mounting joint. ,
Fix it. When the new roof 6 is lifted by the crane C and placed on each mounting joint as described above, the communication portion 13 is prevented from being sandwiched between the new roof 6 and the mounting joint, or Opening not shown (6
Extend outward from a). Note that the new roof portion 6 may be placed directly on the top of the side wall 3 without providing the cantilever member 4 while reinforcing the mounting joint.

Next, as shown in FIG.
2. Work to remove the communication part 13 is performed. Then, the boat B (not shown) is carried in from the opening (6a) of the new roof 6 and floats on the storage water W through the working opening (12c) of the sealing sheet 12, and is inserted from the opening (6a). After the sealing sheet 12 is ready to be received by the rope, the operator gets on the boat B, and sequentially removes fasteners and the like fixing the sealing sheet 12 to remove the sealing sheet 12.
Then, the communication part 13, that is, the temporary sealed structure 11 is taken out of the tank T. Next, the worker escapes from the opening (6a) and folds the boat B to open the opening (6a).
From a), it is carried out of the tank T, and the repair work is completed.

FIG. 13 is an explanatory view showing a temporary roof structure used in the tank roof repair method according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in that the structure and arrangement of the communicating portion 13 of the temporary sealing structure 11, the absence of the shuttle, and the end of the temporary tension structure 21 That is, it is bonded to the side wall 3 and no hanging member is provided. The communication portion 13 is formed in a short cylindrical shape protruding from the sealing sheet 12, and its distal end portion is bent and formed because it is in the storage space U below the temporary tension structure 21, and the opening end faces downward. Or turned sideways.

It is not always necessary to dispose the distal end of the communicating portion 13 outside the tank T as long as the communicating portion 13 has a structure capable of preventing dust and water. And a plurality of communication parts 13 are arranged. Further, the vertical level difference between the temporary sealing structure 11 and the temporary tension structure 21 is appropriately determined according to the shape and scale of the tank T.

In the above embodiment relating to the temporary roof structure K, the tank T is described as being made of prestressed concrete (PC), but may be made of RC or steel.
In addition, although the pot place 12b is provided in the sealing sheet 12, the rainwater R
And the like gather in a slackened portion, so that the kiln place 12b need not be provided. Further, the temporary tension structure 21, that is, the tension structure member 22 is fastened to the side wall 3 located outside the storage space U by using a fastener, and the temporary tension structure 21 is mounted on the side wall 3 located inside the storage space U. It may be fastened and installed.

The temporary tension structure 21 is composed of the tension structure 22 and the falling object blocking member 23, but may be a single sheet having a sieve function, or a single sheet that blocks all falling objects O. The falling object O may not be dropped on the sealing sheet 12. In addition, although the sealing sheet 12 is hung by the hanging member 31 on the tension structure member 22, in the case of a small-diameter tank T or the like, since the falling objects O are reduced, the sealing sheet 12 does not have to be hung by the hanging member 31. Is also good.

In the above-mentioned method of repairing the roof structure, the procedure of carrying the boat B out of the tank T during the work or carrying it in again is adopted, but the boat B floats on the storage water W throughout the construction. You may leave it. Furthermore, the fasteners were attached before the temporary sealing structure 11 and the temporary tension structure 21 were installed.
The temporary tension structure 21 may be fixed with a fastener while being erected.

The communication portion 13 is provided after the temporary tension structure 21 is provided. However, the communication portion 13 may be provided before the temporary tension structure 21 is provided, or the communication portion 13 may be provided before the temporary tension structure 21 is provided. The communication portion 13 provided before the bridge may be penetrated through the temporary tension structure 21 or may extend to the outside of the tank T. Further, the communication portion 13 may be provided after the tension structure member 22 is provided, and the falling object blocking member 23 may be further provided. Further, the communication portion 13 may be extended to the outside of the tank T.

[0055]

As described above, according to the present invention,
The storage space above the stored water is sealed with a temporary sealed structure that does not release substances that degrade water quality even when it comes into contact with water, and the temporary sealed structure is damaged in the storage space above the temporary sealed structure. Since a temporary tension structure is installed to block the falling objects, the existing roof can be repaired or dismantled and replaced with a new roof while using the tank without deteriorating the quality of the stored water. The tank body can be reused.

Further, the function of the existing roof portion made of the RC roof slab (slab) is disassembled, and the function of sealing the storage space and the function of the roofing material are given to the temporary closed structure, and the temporary tension structure is provided. Gives the body a structural function. Therefore,
Since the temporary sealing structure and the temporary tension structure have a double structure, the temporary sealing structure and the temporary tension structure can be optimally selected from materials and structures, and can be freely combined. Furthermore, the temporary closed structure is made of a material that does not release a substance that deteriorates water quality even when it comes into contact with the stored water, and the temporary tension structure is formed so as to block falling objects that damage the temporary closed structure. As a result, a thin sheet-shaped sealing sheet made of an excellent material can be freely used for the temporary sealing structure that directly comes into contact with the stored water, and a structure excellent in waterproofing and dustproofing can be obtained.

According to the second aspect of the present invention, the temporary sealing structure and the temporary tension structure are made of a lightweight and flexible material, and are loaded from the opening of the tank and assembled in the storage space. It can be carried into the existing roof without opening a new opening, and can be assembled manually in a narrow space of the storage space. In addition, since it is not necessary to open a new opening in the existing roof, it is possible to avoid falling objects, dust, muddy water and the like from being mixed into the stored water. Furthermore, not only can the temporary closed structure and the temporary tension structure be manufactured in advance according to the dimensions of the storage space and then be carried in, but also after being carried in, adjusted and processed according to the size and shape of each part in the storage space. It is excellent in workability.

According to the third or fourth aspect of the present invention,
The storage space above the stored water was sealed with a sealing sheet, and the storage space sealed with this sealing sheet was ventilated to the outside air at the communication part, so the sealing sheet functions as a roofing material, dismantling the existing roof part When doing so, falling objects, dust, turbid water, and rainwater can be prevented from falling into and entering the storage water. The communication section can maintain the same pressure difference between the storage space sealed with the sealing sheet and the outside air even if the maximum water level of the storage water rises and falls, so that the sealing sheet expands and contracts. Disappears. In addition, it is possible to prevent dust, muddy water, and the like from entering the stored water through the open end of the communication portion.

According to the fifth aspect of the present invention, since a boat which floats on storage water and does not release a substance deteriorating water quality even when it comes into contact with water is used as a scaffold on which the sealing sheet is erected, the boat can be used as storage water. Since it can be used as a scaffold by floating, the scaffold can be easily set without carrying materials and setting the scaffold. And
The sealing sheet can be installed without deteriorating the quality of the stored water.

According to the sixth aspect of the present invention, since the sealing sheet is suspended from the temporary tension structure by a plurality of suspension members, the load applied to the sealing sheet and the load supporting span are reduced, and the strength required for the sealing sheet is reduced. , And a thin sheet can be used, so that economy and workability are improved. Further, since the tensile force (lateral force) applied to the joint between the peripheral portion of the sealing sheet and the tank body is reduced, the structure of the joint,
The number of installation locations can be reduced.

According to the seventh aspect of the present invention, the tension structure is constituted by a tension structure member provided in the storage space and a falling object blocking member disposed above the tension structure member. The structure is divided into a tension structure member that has a structure function to support vertical loads such as its own weight and work load, and a falling object blocking member that has a function to block solid falling objects that may damage the sealing sheet. can do. Therefore, it is possible to individually select the optimal material and structure for the tension structure member and the falling object blocking member, and to increase the flexibility of forming a lightweight and excellent tension structure by combining them. If the tension structural member is formed as a thin film,
No falling object blocking member is required.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a temporary roof structure used in a tank roof repair method according to a first embodiment of the present invention.

FIG. 2 is an explanatory view showing a planar state in which a sealing sheet is provided.

FIG. 3 is an explanatory view showing a planar state in which a tension structural member is installed.

FIG. 4 is an explanatory view partially broken away showing a planar state in which a falling object blocking member is provided.

FIG. 5 is an explanatory diagram showing a side surface state of the engagement of the sealing sheet, the tension structure member, and the falling object blocking member.

FIG. 6 is an explanatory view showing a repair process of a roof structure (a work of laying a sealing sheet).

FIG. 7 is an explanatory diagram showing a repair process of a roof structure (work for laying a tension structural member).

FIG. 8 is an explanatory diagram showing a repair process of a roof structure (laying work of a falling object blocking member).

FIG. 9 is an explanatory diagram showing a repair process of a roof structure (removal work of an existing roof portion).

FIG. 10 is an explanatory diagram showing a repair process of the roof structure (removal work of the temporary tension structure).

FIG. 11 is an explanatory diagram showing a repair process of a roof structure (a work of attaching a new roof part).

FIG. 12 is an explanatory diagram showing a repair process of the roof structure (removal work of the temporary sealed structure).

FIG. 13 is an explanatory view showing a temporary roof structure used for a tank roof repair method according to a second embodiment of the present invention.

[Explanation of symbols]

 T tank 1 tank main body 2 bottom plate 3 side wall 4 cantilever member 5 existing roof 5a opening 5b through hole 6 new roof K temporary roof structure 11 temporary sealing structure (first temporary roof means) 12 sealing sheet 12a opening 12b Kamaba 13 Communication part 21 Temporary tension structure (second temporary roof means) 22 Tensile structure member 23 Falling object blocking member 23a Opening 24 Attachment 31 Suspension member 41 Anchor bolt 42 Bolt 43 Holding plate 51 Anchor bolt U Storage space W Storage water R Rainwater O Solid matter (falling object) B Boat C Crane

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yukio Taketomi 1-9-1, Nakase, Mihama-ku, Chiba-shi, Chiba In the Makuhari Office of Mitsui Construction Co., Ltd. (72) Kunio Watanabe 1-chome, Nakase, Mihama-ku, Chiba-shi, Chiba No. 9-1 Mitsui Construction Co., Ltd. Makuhari Office F-term (reference) 3E070 AA02 AB02 JB01 JC10

Claims (7)

[Claims] Claims 1. A method for repairing a roof of a tank for repairing an existing roof of a tank, wherein a substance that deteriorates water quality is not released even when contacted with water so as to seal a storage space above the stored water. A temporary closed structure is erected, and a temporary tension structure for blocking falling objects that damages the temporary closed structure is installed in the storage space above the temporary closed structure, and then the existing roof is repaired. Characteristic tank roof repair method. 2. The method for repairing a roof portion of a tank according to claim 1, wherein the temporary sealing structure and the temporary tension structure are made of a lightweight and flexible material, and are carried in from an opening of the tank. A method for repairing the roof of a tank, wherein the tank is assembled in a storage space. 3. The method for repairing a roof portion of a tank according to claim 1, wherein the temporary sealing structure includes a sealing sheet for sealing a storage space above the storage water, and a storage sealed with the sealing sheet. A communicating part for ventilating the space to the outside air, the sealing sheet is erected by joining a peripheral edge to a side wall of the tank, and the communicating part is connected at one end to the sealing sheet. How to renovate. 4. The tank roof repair method according to claim 3, wherein the communicating portion is connected to the sealing sheet by penetrating the erected temporary tension structure. . 5. The method for repairing a tank roof according to claim 3, wherein the sealing sheet is floated on the storage water as a scaffold for erection, and the substance that deteriorates the water quality is not released even if it comes into contact with the water. A method for repairing a tank roof portion, comprising using a boat. 6. The tank roof repairing method according to any one of claims 3 to 5, wherein the sealing sheet is suspended from the temporary tension structure by a plurality of suspension members. Roof repair method. 7. The method for repairing a roof portion of a tank according to any one of claims 1 to 6, wherein the erected tension structure is constituted by a tension structure member and a falling object blocking member. A method for repairing a roof of a tank, wherein the member is bridged with its end joined to a side wall of the tank or an existing roof, and the falling object blocking member is disposed above the tension structural member.