JP2001032566A - Roof structure of tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the roof structure of a tank, in which the lightening of a roof body section and an improvement in corrosion resistance are attained and which has excellent multifunctions such as flexibility, in which the shape of the roof structure can be selected freely, versatility, in which the whole roof body section is hung up and can be removed, convenience, in which a peripheral roof section is used as a passage for inspection, durability, workability, profitability or the like. SOLUTION: In the roof structure 6 of the tank 1 built at the top section of a tank body section 2 having a storage space S on the inside, the roof structure 6 is composed by combining a peripheral roof section 7 projected towards the inside from the side wall 4 of the tank body section 2 and a roof body section 14 closing a horizontal-plane opening section H partitioned by the peripheral roof section 7. The peripheral roof section 7 is formed integrally with a side wall 4 by concrete construction, the roof body section 14 is constituted of a roof surface material 15 covering a roof surface, a roof frame 16, to which the roof surface material 15 is installed and which is made of a metal, and a connecting section 17 annexed to the roof frame 16, and the roof body section 14 is joined with the peripheral roof section 7 by the connecting section 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tank roof structure which is installed on the top of a cylindrical tank body having a storage space.

[0002]

2. Description of the Related Art FIG. 17 is a longitudinal sectional view showing an example of a conventional prestressed concrete tank (hereinafter referred to as "PC tank"), and FIG. 18 is an explanatory view of the features of the tank shown in FIG. In FIG. 17 or FIG. 18, a tank 101 includes a tank main body 102 and the tank main body 1.
The roof (roof body) 105 erected on the top of 02
And a cantilever slab 106 which protrudes outward from the top of the tank main body 102 by a required length to form an inspection passage, and is provided around the outer peripheral edge of the cantilever slab 106. And a fall prevention fence (handrail) 107.

[0003] The tank body 102 comprises a circular bottom plate 103 and a cylindrical side wall 1 formed on the periphery of the bottom plate 103 and having a predetermined thickness and having an annular shape in plan view.
04 and a storage space S for storing tap water A as a content therein. The side wall 1
04 is made of prestressed concrete (hereinafter referred to as “PC
Build ". ), And PC steel materials are arranged in concrete in the vertical and horizontal directions. The roof 105 is a dome-shaped roof in which a roof slab (slab) of a reinforced concrete structure (hereinafter referred to as “RC structure”) integrated with the tank body 2 is formed in a dome shape.

FIG. 19 is a longitudinal sectional view showing another example of a conventional tank having a dome-shaped roof. In FIG. 19, a tank 111 includes a tank body 112 and a roof 115 laid on the top of the tank body 112. And the tank main body 112 is a circular bottom plate 1.
13, a cylindrical side wall 114 having a required thickness and formed in an annular shape in plan view and erected on the periphery of the bottom plate 113.
Thus, a storage space S for storing tap water A as a content therein is provided.

[0005] The roof 115 has a dome-shaped roof by combining an overhanging roof 116 that forms the roof edge and a roof main body 117 that forms the center of the roof. The overhanging roof portion 116 and the roof main body portion 117
Has a constant radius of curvature in a vertical section. The overhanging roof 116 is formed as an RC roof plate integrally extending inward from the top of the side wall 114, and the roof main body 117 is made of a steel material frame and a roof surface material. The entire roof is a composite structure (hybrid) combining an RC structure and a steel frame. A tank having such a dome-shaped roof is disclosed in, for example, Japanese Patent No. 268.
No. 9860 discloses this.

[0006]

The roof 105 of the PC tank shown in FIGS. 17 and 18 has a feature that a roof plate (slab) made of RC is formed in a dome shape. However, the dome-shaped roof 105 has the following disadvantages. First, the tank 101 is obliged to provide an inspection passage on the outer periphery of the top where a person can walk, but since the periphery of the roof 105 is formed in a curved surface with an inclination, Cantilever slab 10 having flat top surface
6 must project outward from the top of the side wall 104, as shown in FIG. The dome-shaped roof portion 105 resists an external force (particularly, a vertical load W) due to stress (tensile stress, compressive stress) in the cross section of the roof slab, so that external stress in the cross section (bending moment, shear force). Is a structure that does not occur.

Therefore, a large horizontal pulling force (hoop tension) is generated along the outer peripheral portion of the roof portion 105 in order to maintain the dome shape, so that the tension ring member is attached to the top of the tank body portion 102. Must be installed circumferentially. Further, since a PC steel material is disposed on the tension ring member to be tensioned and prestressed to prevent tensile stress from being generated in the concrete section, the longitudinal PC of the side wall 104 of the tank body 102 is prevented.
The anchoring portion of the steel material and the PC steel material of the tension ring member in the circumferential direction intersect, resulting in a complicated structure.

Next, the RC roof 105 has the following disadvantages. First, although the RC roof 105 is excellent in durability, it has a large unit volume and a large total weight, so it is originally unsuitable for large span roofs. Often associated with a simple structure. In addition, not only the structure of the roof 105 itself becomes large and complicated, but also the tank body 102 and the bottom plate 103 are formed.
Also becomes large, and economic efficiency and workability may be deteriorated.

Next, the thickness of the concrete section of the roof plate of the roof portion 105 is reduced (usually about 10 cm),
Since reinforcing bars are arranged, when providing an opening necessary for a ventilation hole and an inspection hole in the roof 105, the planar shape of the opening,
Placement is restricted. Furthermore, if the concrete section thickness of the roof slab is made too thin, the cover thickness of the reinforcing bar cannot be secured properly, and it will be exposed to the chlorine atmosphere from tap water A, and the concrete will deteriorate with time. In addition, the workability such as concrete casting of a thin and sloping roof slab is poor.

[0010] Further, in order to construct an RC roof shingle, a large number of pillars are erected in the form of scattered points on the entire bottom slab 103 to support the formwork laid on the entire roof 105. Is required. Since the mold of the roof 105 is also manufactured in a curved shape in accordance with the dome shape, the manufacture of the mold, concrete casting, and the like are complicated. Further, the tank body 1
The work sequence for tensioning the PC steel material disposed on the side wall 104 of the tank 02 is as follows. Since the PC steel material of the ring member is strained, the construction order is intermittent and complicated.

[0011] Accordingly, the roof 105 having the dome-shaped RC roof slab is rational in terms of structural mechanics, but has poor workability, a long construction period, and high costs. If the service life of the roof 105 is shorter than the service life of the tank body 102, the tank body 1
Although the 02 itself can still be used, the entire tank 101 is torn down, which is inferior in economy.

Next, the roof structure of the tank 111 shown in FIG. 19 is a dome-shaped roof of a composite structure combining a RC structure and a steel frame, and the upper part of a large-capacity tank for storing low-temperature liquefied gas is provided. Ideal for covering large span roofs.
Then, the roof main body 117 is made of a steel material to reduce the weight, and the overhanging roof 116 and the roof main body 117 are combined and structurally integrated,
The dome-shaped roof has a constant radius of curvature.

Further, the dome-shaped roof portion 115 in which the overhanging roof portion 116 and the roof main body portion 117 are combined is required to form an integrated structural mechanical model. The problem of is kept as it is. Further, the joint between the overhanging roof portion 116 and the roof main body portion 117 is required to have an integrated and complete structure that smoothly transmits the cross-sectional stress (tensile stress, compressive stress) of the roof main body portion 117.

The present invention has been made in order to solve the above-mentioned inconveniences, and has a roof structure constructed of a concrete peripheral roof portion which extends laterally inward from a side wall of a tank body, By constructing a composite structure combining a metal roof body that blocks the horizontal opening defined by the tip of this peripheral roof,
While reducing the weight of the roof body and improving the corrosion resistance,
Multi-functionality such as flexibility to freely select the shape, flexibility to lift and remove the entire roof main body, convenience to use the surrounding roof as a passage for inspection, durability, construction, economy, etc. An excellent tank roof structure is provided.

[0015]

A first aspect of the present invention is a tank roof structure which is installed on the top of a cylindrical tank body having a storage space therein. A peripheral roof that protrudes inward from the side wall of the part and a roof body that closes the horizontal opening defined by this peripheral roof are combined, and the peripheral roof is integrally formed with the side wall by concrete. The roof main body is composed of a roof surface material covering the roof surface, a metal roof frame to which the roof surface material is attached, and a connecting portion attached to the roof frame. And joined to the surrounding roof.

According to a second aspect of the present invention, in the tank roof structure of the first aspect, the peripheral roof portion is formed of a concrete slab and / or a concrete beam. According to a third aspect of the present invention, in the tank roof structure of the first aspect, the peripheral roof portion is formed of an aluminum alloy plate and / or an aluminum alloy or concrete beam.

According to a fourth aspect of the present invention, in the tank roof structure of the first aspect, the peripheral roof portion is provided so as to protrude laterally inward from the side wall by a required length, and is provided around the periphery.
It is formed in an annular shape in plan view. Next, in a fifth aspect of the invention, in the tank roof structure of the fourth aspect, the peripheral roof portion is formed in a plan view annular shape having a floor opening or a notch. According to a sixth aspect of the present invention, in the roof structure of the tank according to the first aspect, the peripheral roof portion has a required length provided with at least an inner law necessary for the inspection passage.

According to a seventh aspect of the present invention, in the tank roof structure of the first aspect, the peripheral roof portion is formed to have a substantially horizontal upper surface or a required gradient such that the upper surface rises toward the roof main body. It is formed by inclining. The invention according to claim 8 is the tank roof structure according to claim 1, wherein the roof surface material is a plate made of aluminum alloy, a metal plate made of iron, stainless steel, copper, or the like, or a plate made of glass or synthetic resin. Or a roofing material such as a membrane.

Next, according to a ninth aspect of the present invention, in the tank roof structure of the first aspect, the roof main body resists a vertical load such as its own weight or snow load by the roof frame supported by the connecting portion. Constitute an independent structural mechanical mechanism,
The peripheral roof constitutes a structural mechanical mechanism for transmitting the vertical load transmitted via the connection to the side wall. According to a tenth aspect of the present invention, in the tank roof structure of the ninth aspect, the connecting portion is slidable in a horizontal direction with respect to a vertical load such as a dead weight of the roof main body and a snow load, and is vertically movable. And has a deformability supported by being restrained.

According to an eleventh aspect of the present invention, in the tank roof structure according to the ninth aspect, the connecting portion moves horizontally and vertically in response to a vertical load such as the weight of the roof main body and a snow load. It has a deformability supported by being restrained from moving. According to a twelfth aspect of the present invention, in the tank roof structure of the first aspect,
A dome-shaped roof having a truss structure is formed by an aluminum alloy roof surface material and a metal roof frame.

According to a thirteenth aspect of the present invention, in the roof structure of the tank according to the first aspect, a liquid such as water or petroleum or a solid such as coal, cement, or grain is stored in the storage space. . According to a fourteenth aspect of the present invention, in the roof structure of the tank according to the first aspect, the restraint of the vertical movement of the connecting portion is released for the purpose of inspecting and repairing the storage space after completion. The entire part is lifted up and detached from the tank body.

Further, according to the present invention, in a roof structure of a tank erected on the top of a cylindrical tank body having a storage space therein, the roof structure is moved inward from a side wall of the tank body. It is configured by combining a peripheral roof part that protrudes laterally in a required length and a roof body part that closes a horizontal opening defined by the peripheral roof part, and the peripheral roof part is integrated with the side wall. The roof body is made of a concrete slab and / or a concrete beam, and the roof main body is made of an aluminum alloy roof surface material that covers the roof surface, and a metal roof frame to which the roof surface material is attached. And a connecting portion attached to the roof frame, and the roof main body is detachably connected to the peripheral roof portion at the connecting portion.

Next, a sixteenth aspect of the present invention is the invention according to any one of the first to fifteenth aspects, wherein the roof frame is made of steel or an aluminum alloy.

[0024] A roof structure for a tank, characterized in that: Here, each term will be described. First, the tank main body is a cylindrical container structure having a storage space therein, and has a wall having a required wall thickness and an annular planar shape, and a bottom plate for closing the bottom of the tank main body. I have. Next, the roof structure is a roof erected on the top of the side wall of the tank body in order to close an upper horizontal plane of the storage space. The top of the side wall is generally the top of the side wall, but is not limited to this, and may be lower than the top of the side wall as long as it is located above the storage space. The roof structure often has a dome-shaped roof shape, but its planar or elevational shape can be freely selected.

Next, the peripheral roof part is a part of a roof structure that projects inward from the top of the side wall of the tank body and is formed integrally with the side wall by concrete.
Then, the peripheral roof portion extends laterally with a required length and closes a part of the horizontal surface above the storage space, so that the front end portion (the protruding front edge) defines the horizontal surface opening. Next, the roof main body is a main part of the roof structure that closes the horizontal opening, and forms a roof surface (the surface of the roof) that is inclined at a required water gradient to allow rainwater to flow.

The roof surface material is a surface member laid on the roof surface to allow rainwater to flow, and is called a roofing material. The material of this roof surface material is preferably a thin plate made of aluminum alloy from the viewpoint of corrosion resistance, but metal plates such as iron, stainless steel, copper, etc.
Plates such as glass and synthetic resin plates, membranes, and the like, which are usually used as roofing materials, may be appropriately selected from the viewpoints of weight reduction, corrosion resistance, strength, cost, and the like of roof surface materials. Then, a plurality of roof surface materials may be mixed in one roof main body.

Next, the roof frame is a frame which can independently independently resist a vertical load and a horizontal force applied to the roof structure itself. The type of the frame is generally a truss structure such as a three-dimensional truss structure and a plane truss structure, but may be a ramen structure including columns, beams and the like. Further, a simple structure in which a beam member made of a single material or an assembled material is installed may be used. The roof frame is made of metal such as steel or aluminum alloy.

Next, the connecting portion refers to a connecting portion provided near the both ends of the roof frame in order to connect the roof main body portion to the peripheral roof portion. This is the point of supporting the structure.) The connecting portion is often arranged at a predetermined interval on the periphery of the roof main body in a plan view, and is joined to the vicinity of the tip of the peripheral roof portion to reduce the vertical load and horizontal force applied to the roof frame to the peripheral roof. To the department. The material of the connecting portion may be any material having a required strength, such as aluminum alloy, steel, stainless steel and the like.

Next, the deformability, in which the connecting portion is slidable in the horizontal direction and restrained from moving in the vertical direction, is supported by:
The deformability in which the connecting portion is supported while being restrained from moving in the horizontal direction and the vertical direction is referred to as forming the pin fulcrum.

The connecting portion forms a roller fulcrum or a pin fulcrum. The deformation (two-dimensional deformation) in the vertical plane passing through the connecting portion is three types of vertical deformation, horizontal deformation, and rotational deformation.
Although classified into types, horizontal and rotational deformations are free, and fulcrum where vertical deformation is restricted is called roller fulcrum,
A fulcrum where horizontal deformation and vertical deformation are restricted and rotation deformation is free is called a pin fulcrum. A fulcrum in which all of vertical deformation, horizontal deformation and rotational deformation are restricted is referred to as a fixed fulcrum.

The roller fulcrum, the pin fulcrum, and the fixed fulcrum are concepts of a structural dynamic model of force and deformation, and are omitting a specific structure of a joint. Then, a shearing force and a vertical force (compression force, tensile force) are generated in the connecting portion in accordance with the horizontal deformation and the vertical deformation, but since the rotational deformation is free, no bending moment is generated in the connecting portion. Here, the shearing force is a horizontal reaction force (thrust) generated at the pin fulcrum, and acts as a horizontal force on the connecting portion.

Next, a case where the connecting portion forms a roller fulcrum for a vertical load will be described. The connecting portion that constitutes the roller fulcrum is slidably supported in the horizontal direction against vertical loads such as the own weight of the roof main body and snow loads,
Vertical movement is restricted. However, in the event of an earthquake, a storm or the like, a connecting portion is arranged on the periphery of the roof body in a plan view so that at least a portion of the connecting portion can resist the horizontal force. . The connecting portion has a structure capable of withstanding a vertical force (compression force, tensile force) and a shearing force (however, at the time of an earthquake or a storm).

Next, a case will be described in which all the connecting portions constitute a pin fulcrum with respect to a vertical load. The connecting portion forming the pin fulcrum is restricted from moving in the horizontal and vertical directions with respect to a vertical load and a horizontal force. Therefore, the connecting part is required to apply the vertical force (compression force,
Tensile force) and shear force.

Next, the vertical load is a load applied to a structure due to the weight of an object and refers to a load acting in the direction of gravity, and includes a self-weight (fixed load), a loaded load, a snow load, and the like. The horizontal force refers to an external force acting in the horizontal direction among loads applied to a structure, and includes seismic force, wind pressure, and the like.

Next, an aluminum alloy is an alloy containing aluminum as a main component, and as summarized in Table 1, JI
SH 4000.

[0036]

[Table 1]

The mechanical properties of the aluminum alloy and the like have the properties shown in Table 2.

[0038]

[Table 2]

The aluminum alloy used for the roof surface material preferably has an increased strength without deteriorating the workability and corrosion resistance of pure aluminum.
An l-Mn type (3000 type) is suitable. The aluminum alloy used for the roof frame is preferably a structural member having good strength and corrosion resistance. For example, Al-Mn-S
An i system (6000 system) is suitable.

Next, concrete construction means reinforced concrete construction (RC construction) and prestressed concrete construction (P
C), steel-framed reinforced concrete ("SRC") and the like. The construction method may be any of cast-in-place concrete construction and precast concrete construction (“Pca construction”). The slab is a concrete plate-like body (floor slab) having a predetermined thickness and mainly receives a vertical load, but may also receive an in-plane shear force and an axial force during an earthquake. A slab in which one end is supported by a fixed fulcrum and the other end (tip) is free is called a cantilever slab.

Next, a beam is a structural member that is supported on at least one fulcrum in a state of being substantially horizontal or inclined at a required gradient, and is a vertical load perpendicular or oblique to the material axis. In response to this, a bending moment and a shear force are generated in the member. The longitudinal sectional shape of the beam is generally rectangular, but may be any shape, and may be a wall-shaped member. In the case of a concrete structure, the slab and the beam are often formed integrally. A beam having one end supported by a fixed fulcrum and the other end (tip) being free is referred to as a cantilever. Slabs and beams belong to the bending material.

Next, a bending material is a member that bears a bending moment. The force generated in the section of the member is classified into a bending moment, a shear force, and an axial force (axial force). A member in which the bending moment is dominant is referred to as a bending material.
The contents of the storage space may be a liquid such as water or petroleum, or a solid such as coal (granules), grain (granules), cement (powder). In addition, the characteristics of the contents affect the selection of the roof surface material of the roof main body and the material of the roof frame from the viewpoint of corrosion resistance.

Next, the roof structure 6 according to the present invention will be described with reference to the explanatory view of FIG. 1. The roof structure 6 is a concrete structure that projects laterally inward from the side wall 4 of the tank body 2. And a metal roof main body 14 that closes a horizontal opening H defined by the tip of the peripheral roof 7 has a combined structure. Since they are joined at the connecting portions 17 of 14, the weight, durability, workability, economy, and flexibility are excellent.

The present invention is characterized in that the roof body 14 is reduced in weight and improved in corrosion resistance. The metal roof frame provides weight reduction and corrosion resistance, and the peripheral roof portion 7 further reduces the size of the roof main body portion 14 and promotes weight reduction. In addition, the roof body 14
The lightening of the structure has the advantage that the peripheral roof portion 7 and the roof main body portion 14 are configured as independent frames, and that the entire roof main body portion 14 can be lifted. Furthermore, the corrosion resistance improves the durability of the roof body 14. The aluminum alloy itself has corrosion resistance. Further, in the case of steel, the corrosion resistance may be enhanced by applying a rust preventive treatment to the steel frame, or the corrosion of the cross section of the member may be considered in advance in the design without performing the rust preventive treatment.

Next, the features and effects of the roof structure 6 according to the present invention will be described. First, the roof structure 6 is a composite structure (hybrid) in which a concrete surrounding roof portion 7 and a metal roof main body portion 14 are combined. The peripheral roof 7 is configured as a concrete structural member that is structurally integrated with the side wall 4 of the tank body 2. The roof body 14 is made of a metal roof frame to reduce its own weight and improve corrosion resistance. Therefore, the present invention can solve various problems in which the conventional PC tank is formed of an RC roof plate.

Second, the peripheral roof 7 and the roof main body 14 are configured as independent frames, and the connecting portion 17 of the roof main body 14 is placed near the tip of the peripheral roof 7 and connected. Roof part 7 and roof body part 1 with the part 17 as an intervening member
4 is structurally integrated and joined. Therefore,
The present invention eliminates the limitation of an integrated dome-shaped roof in which the peripheral roof portion 7 and the roof main body portion 14 have the same radius of curvature, and the conventional tank forms a dome-shaped roof portion. Various problems can be solved.

The plane shape and the elevation shape of the roof main body 14 can be freely selected. In particular, the roof body 1
The upright shape of No. 4 can form an aesthetic appearance with less intimidation in consideration of the surrounding environment. Also, for the roof frame, an optimal structural type can be selected in terms of weight, cost, and proof stress.

Third, the tank body 2 forms one large and strong concrete container structure having a horizontal opening at the top, and the roof body 14 is a lid for closing the horizontal opening of the tank body 2. Has a personality as a body. The peripheral roof 7 is a part of the roof structure 6, but is configured as a concrete structural member structurally integrated with the top of the side wall 4 of the tank body 2. The roof body 14 is a main part of the roof structure 6, but is mounted on the peripheral roof 7 and can be detachably joined.

As described above, the roof main body 14 has a roof frame made of metal, and is designed to be lightweight and have improved corrosion resistance. Next, the features and effects of the roof main body 14 will be described. First, the roof frame of the roof main body 14 is configured as an independent frame. The roof body 14 has an independent structural mechanical mechanism that resists vertical loads (self-weight, loading load, snow load, etc.) applied to the roof body 14 by the roof frame supported by the connecting portions 17 at both ends. Constitute.

Second, the connecting portion 17 of the roof body 14 is
A roller fulcrum or a pin fulcrum is selected and configured for the peripheral roof portion 7. When the connecting portion 17 forms a roller fulcrum, the roof main body portion 14 is supported so as to be slidable in the horizontal direction. Therefore, even if a vertical load acts on the roof frame, the connecting portion 17 has a vertical force (compression force). , Tensile force) and no shear force. Therefore, even if a horizontal deformation shift occurs between the top of the tank main body 2 and the roof main body 14 due to a temperature difference between the inside and the outside of the tank main body 2, a pressure difference, or the like, the horizontal deformation of the connecting portion 17 does not occur. Since the displacement is absorbed, the influence on the roof main body 14 is small. That is, the roof frame of the roof main body 14 is an independent frame structurally separated from the tank main body 2.

The connecting portion 17 has a structure capable of absorbing the horizontal deformation in the direction and amount assumed in the design when a vertical load is applied to the roof frame, and may be configured to be slidable only in the moving direction. It is not necessary to make it slidable in every direction of a horizontal plane. For example, in the case of a dome-shaped roof frame having a three-dimensional truss formed radially, a structure capable of absorbing a predetermined amount of horizontal deformation only in the radial direction, that is, only in the radial direction may be used. Further, when the connecting portion 17 forms a pin fulcrum, since the connecting portion 17 is supported by being restrained in both the horizontal and vertical directions, even if a vertical load is applied to the roof frame, the connecting portion 17 is supported.
Not only vertical force (compression force, tension force) but also shear force is generated.

Third, the entire roof body 14 can be lifted. Since the roof main body portion 14 has a light weight, it can be lifted by a crane working vehicle or the like. Therefore, during the construction, the roof main body 14 can be assembled on the ground, and after the tank main body 2 is constructed, the entire roof main body 14 can be lifted and erected on the tank main body 2, thereby shortening the construction period and cost. Down can be achieved. In addition, after the tank is completed, the restraint of the vertical movement of the connecting portion 17 of the roof main body portion 14 is released for the purpose of inspection and repair of the storage space S, so that the entire roof main body portion 14 is lifted and the tank main body portion 2 is lifted. The maintenance and inspection of the storage space S and the repair of the roof main body 14 are facilitated.

Fourth, the durability of the roof body 14 can be improved. The corrosion resistance of the roof frame and the roof surface material can be appropriately configured with respect to the site conditions, the outside air conditions, and the design conditions such as the contents in the storage space S. In particular, when the content is tap water A, even if it is exposed to air (chlorine atmosphere) in which chlorine contained in tap water A is vaporized, the characteristics of metal (particularly, aluminum alloy) are fully utilized,
The durability is improved while the weight of the roof main body 14 is reduced. Therefore, by making the service life of the roof body 14 the same as the service life of the tank body 2, it is possible to provide a tank structure excellent in economic efficiency.

Next, the features and effects of the peripheral roof portion 7 will be described. First, the peripheral roof portion 7 constitutes a structural mechanical mechanism for transmitting the vertical force (compression force, tension force) transmitted via the connecting portion 17 to the side wall 4 of the tank body 2. Due to the vertical load applied to the roof body 14, the connecting portion 1 of the roof frame
7 generates a vertical force. Here, since the connecting portion 17 is joined to the vicinity of the front end portion of the peripheral roof portion 7, the vertical force is applied as a concentrated load to the protruding front end portion of the peripheral roof portion 7. Therefore, by forming the peripheral roof portion 14 with a bending material such as a cantilever slab or a cantilever beam and transmitting the vertical force, the roof body portion 14 is reduced in weight and the vertical force is reduced, so that the structure is reduced. It becomes possible by design.

Second, the peripheral roof 7 is attached to the tank main body 2.
And is formed as a concrete structural member structurally integrated with the side wall 4, and extends a predetermined length in the lateral direction toward the inside of the tank body 2. Therefore, the span of the roof main body portion 14 is shortened by the overhang length of the peripheral roof portion 7. Since the roof main body 14 is made of metal and has a small horizontal area, the weight and cost can be reduced.

Further, the peripheral roof 7 can be used as an inspection passage through which a person can walk. further,
Since the cantilever slab does not protrude outward from the side wall 4, the side wall 4 of the tank body 2 has a smooth wall surface without protrusions facing outward.

Since the peripheral roof portion 7 only protrudes inward by a required length, the work of assembling a scaffold at a high place called the top of the tank main body portion 2 and reducing concrete is reduced, and the side wall 4 The scaffolding and pillars necessary for concrete casting can be used as they are, reducing the need for shoring work. In addition, since it is easy to increase the thickness of the concrete section of the slab of the peripheral roof part 7, the covering thickness of the reinforcing steel can be properly secured, and even if the concrete is exposed to the chlorine atmosphere from the tap water A, the concrete deteriorates with time. Can be delayed, so that the durability is excellent.

Third, the peripheral roof 7 does not form a dome-shaped roof. The problem of the prior art tank forming a dome-shaped roof can be eliminated.
Therefore, it is not necessary to install a tension ring member necessary for maintaining the dome shape on the top of the tank body 2 in the circumferential direction, so that the structure of the top of the side wall 4 of the tank body 2 and the vertical The fixing part of the PC steel material has a simple structure.

The work of tensioning the PC steel material disposed on the side wall 4 of the tank body 2 can continuously tension the PC steel material in the vertical direction and the PC steel material in the circumferential direction.
Workability is improved. Further, since no tensile force is generated in the circumferential direction of the tank body 2, even when the peripheral roof 7 is provided around the inside of the side wall 4 to form a continuous annular shape in plan view,
Reinforcing reinforcement in the circumferential direction in the cross section of the peripheral roof portion 7 is unnecessary. In addition, a notch or an opening required for a ventilation hole and an inspection hole can be freely installed in a part of the peripheral roof portion 7 having an annular shape in a plan view.

Fourthly, the peripheral roof portion 7 is formed so that its upper surface is substantially horizontal or its upper surface is inclined at a predetermined gradient rising toward the roof main body portion 14 and laterally projects. . Therefore, since the formwork of the peripheral roof part 7 may be manufactured in a flat shape, the manufacture of the formwork, concrete casting, and the like can be simplified.

[0061]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a perspective view of a tank to which the roof structure according to the first embodiment of the present invention is applied, FIG. 3 is a longitudinal sectional view of the tank shown in FIG. 2, and FIG. 4 is an oblique side view of the tank shown in FIG. , FIG. 5 is a plan view of the top of the tank shown in FIG. 2, FIG. 6 is a plan view of the tank shown in FIG. 2 with the roof main body removed, and FIG. FIG. 2 is a perspective view showing the same or corresponding parts in FIG. In FIG. 2, the illustration of the fall prevention fence is omitted. 2 and 6, illustration of the floor opening is omitted.

The tank 1 is composed of a tank body 2 and a roof structure 6 installed on the top of the tank body 2. The tank main body 2 is a cylindrical container structure having a storage space S therein, and has a circular bottom plate 3 for closing the bottom of the tank main body 2 and a wall provided on the periphery of the bottom plate 3. And a side wall 4 having an annular planar shape that is erected thick. Since the side wall 4 is made of PC, a PC steel material is buried in the concrete in the longitudinal direction and the circumferential direction in addition to the reinforcing bar. As shown in FIG. 5, four ridges 5 are provided on the outer surface of the side wall 4 on a plane with a required width, and the ridges 5 are formed of PC steel in the circumferential direction of the side wall 4. It is a fixing unit that ties together.

The above-mentioned roof structure 6 includes the tank body 2
A roof body that laterally projects inward from the top of the side wall 4 of the vehicle, and a roof main body that closes a horizontal opening H defined by the tip (extended tip edge) of the roof 7 It is configured in combination with the unit 14.
The peripheral roof 7 has an annular shape, and the planar shape of the roof main body 14 is circular, and is similar to the side wall 4 of the circular tank main body 2.

The peripheral roof portion 7 is formed in an annular shape in plan view by extending the required length in the horizontal direction from the side wall 4 to the inside in such a manner as to extend therearound. The peripheral roof portion 7 includes a cantilever slab 8 and a rising portion 9 erected upward at the tip of the cantilever slab 8.
The cantilever slab 8 and the rising portion 9 are formed as an integrated RC structural member. Also, since the upper surface of the cantilever slab 8 is formed in a substantially horizontal shape,
It can be used as an inspection passage where people can walk.

The overhang length (L in FIG. 8) of the cantilever slab 8 is determined by the internal dimension required for the inspection passage, the economical efficiency of designing the cantilever slab 8 as a bent material, and the workability of the formwork. And the correlation with the span length of the roof main body 14. In particular, by adjusting the overhang length of the cantilever slab 8, the side wall 4 of the tank body 2 is adjusted.
Even if the inner span length (D in FIG. 8) is different, the roof main body 14 having the same span length can be installed, so that the roof main body 14 can be standardized. The cantilever slab 8 is formed of concrete integrally with the side wall 4 and has a floor opening 11 for cleaning and inspection at a predetermined position in the circumferential direction. In addition, around the outer periphery of the cantilever slab 8, it is made to go around and fall prevention fence (handrail)
13 are provided.

The above-mentioned rising portion 9 is provided around the tip of the cantilever slab 8 in an annular shape in plan view.
The rising portion 9 plays a role of a columnar portion for connecting and fixing a connecting portion 17 attached to a roof frame 16 to be described later, and a parapet (a low handrail wall provided for protecting the tip portion on the roof of a building). Fulfill. Further, the rising portion 9 has a rectangular longitudinal section, and the upper surface is substantially horizontal.

The above-mentioned roof main body 14 has a dome-shaped roof shape, and forms a spherical roof surface (roof surface) which is inclined at a predetermined water gradient to allow rainwater to flow. And
The plane shape of the roof body 14 is circular, and its span length (D _{1 in} FIG. 8) is the inner span length of the side wall 4 (D in FIG. 8).
The length of the overhang of the peripheral roof portion 7 (L in FIG. 8) is subtracted from the above. In addition, the roof main body portion 14 includes a roof surface material 15 covering the roof surface, a roof frame 16 made of an aluminum alloy to which the roof surface material 15 is attached, and a roof frame 16 attached thereto. And a connecting portion 17 joined to the connecting portion 17.

The above-mentioned roof surface material 15 is desirably a thin plate made of aluminum alloy from the viewpoint of corrosion resistance.
Roofing materials such as metal plates such as iron, stainless steel, and copper, plates such as glass and synthetic resin plates, and films may be used. In addition, the roof frame 16 forms a spherical three-dimensional truss structure made of an aluminum alloy. This three-dimensional truss structure
On a spherical roof surface, a large number of small triangular surfaces are formed at intersections (nodes) of linear structural members (called chords).

As shown in FIG. 7, the cross-sectional shape of the chord is an H-shaped assembly cross-section, but other known shapes may be used. Although not shown, a tension ring structure member made of an aluminum alloy that resists a tensile force (hoop tension) in a circumferential horizontal direction to maintain a dome shape is provided on an outer peripheral edge of the roof frame 16. Are located. Therefore, the roof frame 16 is a frame that can independently independently resist vertical load and horizontal force.

The connecting portion 17 is a connecting portion attached to both ends of the roof frame 16 for connecting the roof main body portion 14 to the peripheral roof portion 7, and is an upper surface of the rising portion 9 of the peripheral roof portion 7. Placed on As shown in FIG. 7, the connecting portion 17 includes a supporting leg 18 and a fastener 21. The support leg 18 has an H-shaped cross section including a base plate 19, and two long holes 20 are formed in the base plate 19.

Next, the fastener 21 is attached to the anchor bolt 22
And a nut 23 screwed into the anchor bolt 22;
It comprises a washer 24 disposed between the nut 23 and the base plate 19. The anchor bolt 22 has a lower portion embedded in the concrete of the rising portion 9, an upper portion protruding from the rising portion 9, penetrating through the elongated hole 20 formed in the base plate 19, and being fastened to the base plate 19 by a nut 23. I have.

The above-described elongated hole 20 is elongated in the radial direction of the roof frame 16 in a plan view (radial direction from the center of the roof frame 16 to the outside as indicated by the arrow in FIG. 6), but is circular in plan view. The hole diameter in the circumferential direction (peripheral edge of the roof frame 16) is obtained by adding a clearance (usually about 5 mm) necessary for construction to the outer diameter of the anchor bolt 22. Therefore, the connecting portion 17 is slidable in the horizontal direction in the radial direction of the roof frame 16, but forms a roller fulcrum in which horizontal deformation in the circumferential direction is restricted and movement in the vertical direction is also restricted. .

As shown in FIG. 6, 14 connecting portions 17 are arranged concentrically on the rising portion 9 of the peripheral roof portion 7. When a vertical load W such as its own weight or a snow load is applied to the roof frame 16, the connecting portion 17 forms a roller fulcrum in the radial direction, so that the connecting portion 17 is movable in the radial direction, and the plane shape of the roof frame 16 is changed. Deforms so as to expand concentrically. However, since the connecting portion 17 is arranged on a concentric circle with a suitable distance therebetween in a direction capable of horizontal movement in a radial direction, and horizontal deformation in a circumferential direction is restrained, the connecting portion 17 can be used at the time of an earthquake or a storm. At least a part functions as a pin fulcrum, not a roller fulcrum, against horizontal force applied to, for example, and can resist the horizontal force.

When a vertical load W is applied to the roof frame 16 where the connecting portion 17 forms a roller fulcrum, the connecting portion 1
Although a vertical force (compression force) acts on 7, no shear force is generated. However, when a horizontal force is applied during an earthquake or storm,
Not only vertical force (compression force, tension force) but also shear force is generated. The compressive force is transmitted directly to the rising portion 9 via the base plate 19, the tensile force is resisted by the tensile strength of the anchor bolt 22, and the shear force is transmitted to the rising portion 9 by the shear strength of the anchor bolt 22. Is done.

FIG. 8 is an explanatory view of stress and deformation when a vertical load is applied to the roof frame in which the connecting portion constitutes the roller fulcrum, and is the same as or equivalent to FIGS. The description is omitted by attaching reference numerals. In FIG. 8, D
Is the inner diameter of the side wall 4, L is the overhang length of the cantilever slab 8,
D ₁ is the inside diameter of the horizontal opening H which is defined by the cantilever slab 8, P is distributed vertical load of vertical load W, Q is a vertical load on the tip of the cantilever slab 8, N _C is the roof framework 16 axial force caused in the chord (compression force), the horizontal deformation amount of D _X connecting portion 17, M _g is bent occurs at the root portion of the cantilever slab 8 by vertical load Q (joint end of the side wall 4) moment Is shown.

The tank 1 of the first embodiment described above is similar to that of FIG.
As shown in (1), the roof body 14 is deformed by the vertical load W such as its own weight and snow load, and the outer diameter becomes larger by a predetermined value.
Even if the roof main body 14 is deformed so as to become large due to the vertical load W in this manner, the roof main body 1 is connected to the connecting portion 17 that forms a roller fulcrum that can slide in the radial direction (horizontal direction).
4 is joined to the cantilever slab 8, so that the connecting portion 17
Produces only vertical forces. Accordingly, the vertical force via the connecting portion 17 is transmitted to the tip of the cantilever slab 8, but the bending moment M _g is generated in the cantilever slab 8, the bending moment M _g is supported by the side walls 4 and cantilever slab 8 It will be good.

FIG. 9 is an explanatory view showing a state in which the roof main body is lifted. The same or corresponding parts as those in FIGS. In FIG. 9, C indicates a crane working vehicle. As described above, since the roof main body portion 14 is composed of the roof surface material 15 and the roof frame 16 made of an aluminum alloy and is light in weight, it is possible to release the restraint on the vertical movement of the connecting portion 17. The roof body 14
Can be lifted and removed.

Since the connecting portion 17 shown in FIG. 7 is fixed to the rising portion 9 by the fastener 21 and is restricted from moving in the vertical direction, the nut 23 screwed to the anchor bolt 22 is removed. Thereby, the restriction of the vertical movement can be easily released. Therefore, the inspection and repair of the storage space S can be facilitated by lifting and removing the roof main body 14 after completion, or the roof main body 14 is assembled and lifted on the adjacent ground at the time of construction. By mounting by mounting, the construction period can be shortened and the cost can be reduced.

In the connecting portion 17 shown in FIG. 7, the long hole 20 formed in the base plate 19 was changed to a round hole, and the hole diameter of the round hole was added to the outer diameter of the anchor bolt 22 to add a clearance required for construction. In this case, the deformation of the connecting portion 17 in the horizontal direction in the radial direction and the circumferential direction is restricted,
Constitutes a pin fulcrum. When the connecting portion 17 is used as a pin fulcrum, the connecting portion 17 can be used in any of a vertical load and a horizontal force.
A vertical force (compression force, tensile force) and a shear force are generated in the armature, and the vertical force and the shear force are transmitted to the rising portion by the base plate 19 and the anchor bolt 22.

Next, the roof body section 14 is made of an aluminum alloy for the roof frame 16 to reduce the weight and improve the corrosion resistance. In comparison with the case where the dome-shaped roof having the same span length is made of RC or steel in the related art and the case of the present invention with respect to weight reduction, the own weight of the roof main body portion 14 in the present invention is: RC
About 1/30 of steel and about 1/3 of steel. Further, the substantial span length of the roof main body 14 according to the present invention is obtained by subtracting the total length of the overhang of the peripheral roof part 14 from the inner span length of the tank main body 2.
The horizontal area is reduced and its total weight is significantly reduced.

FIG. 10 is a longitudinal sectional view of a tank to which a roof structure according to a second embodiment of the present invention is applied, and FIG.
10 is a plan view of the tank with the roof main body removed, and the same or corresponding parts as in FIGS. 1 to 9 are denoted by the same reference numerals and description thereof is omitted. In FIG. 11, the illustration of the fall prevention fence is omitted. In these figures, the peripheral roof portion 7 is integrally formed with the cantilever slab 8 and the rising portion 9 described above and the side wall 4 in the circumferential direction at a predetermined interval below the cantilever slab 8. And a cantilever 10.

The cantilever slab 8 has a floor opening 11 for cleaning, inspection, or ventilation, and a notch 1 as described above.
2 are provided. Although not shown, the floor opening 11 and the notch 12 are provided with an openable / closable lid, a ventilation device, and the like. The floor shape, the number, the arrangement, and the like of the floor opening 11 and the notch 12 can be freely set, and the outer periphery of the cantilever slab 8 is provided with a fall prevention fence (handrail) 13 that goes around. Have been.

The second embodiment differs from the first embodiment in that a cantilever 10 is provided and a notch 12 is provided. As described above, when it is necessary to make the peripheral roof portion 7 have a configuration in which the cantilever 10 is added to the cantilever slab 8, the vertical load (Q in FIG. 8) applied to the distal end portion of the peripheral roof portion 7 is large. If the overhang length (L in FIG. 8) of the peripheral roof 7 is large, if the horizontal opening H defined by the tip of the peripheral roof 7 has an irregular shape, the cantilever slab 8 is large. A case in which the vertical load from the roof main body portion 14 cannot be transmitted to the side wall 4 of the tank main body portion 2 only by the cantilever slab 8, for example, when a large number of notch portions 12 are arranged. Note that the description of the functions and the like of the second embodiment is omitted, but the functions and the like of the first embodiment can be obtained, and the same effects as those of the first embodiment can be obtained.

FIG. 12 is a longitudinal sectional view of a tank to which a roof structure according to a third embodiment of the present invention is applied, and FIG.
14 is a plan view of the top of the tank shown in FIG. 14, FIG. 14 is a plan view of the tank shown in FIG.
5 is an explanatory view showing another example of the configuration of the connecting portion, and FIGS.
The same or corresponding parts as those in FIG. 13 and 14, the illustration of the fall prevention fence is omitted.

The planar shape of the peripheral roof portion 7 in this embodiment is such that the root portion (joint end with the side wall 4) is circular, but the distal end portion (extended distal edge) has a substantially octagonal annular shape. No. The peripheral roof portion 7 includes a cantilever slab 8 and a rising portion 9 erected upward at the tip of the cantilever slab 8.
The upper surface is formed to be inclined at a predetermined gradient rising toward the center of the roof main body portion 14.

As described above, since the cantilever slab 8 is inclined, rainwater flowing from the roof main body portion 14 can be easily removed from the side wall 4.
Can be drained to the outside, and can be used as an inspection passage if the inclination is not too large. However, when increasing the inclination of the cantilever slab 8, a simple catwalk may be provided. Furthermore, the inclined cantilever slab 8, together with the elevation of the roof body 14, characterizes the appearance of the roof structure. In addition, the rising portion 9 is provided at the distal end of the cantilever slab 8 in an annular shape having a substantially octagonal shape in plan view.

The roof body 14 in this embodiment is
It has an octagonal truncated pyramid roof shape, has a octagonal planar shape, and is non-similar to the circular shape of the side wall 4 of the tank body 2. As described above, regardless of the shape of the tank body 2, the plane and the elevation of the roof body 14 can be freely selected. The roof frame 16 constituting the roof main body 14 can also adopt a wide variety of structural types optimal for an octagonal truncated pyramid. This is because the roof frame 16 is a frame that can independently independently resist vertical load and horizontal force.

Next, the connecting portion 17 shown in FIG. 15 is an example of forming a roller fulcrum. The connecting portion 17 includes a support leg 18 and a fastener 21 and is mounted on the upper surface of the rising portion 9 of the peripheral roof 7. Have been. The support leg 18 has an H-shaped cross-section member projecting downward from the chord of the roof frame 16, and a base plate having two long holes (not shown) formed in a lower portion thereof. 19 is provided.

Further, the fastener 21 is attached to the anchor bolt 22
And a nut 23 screwed into the anchor bolt 22;
It is composed of a nut 23 and a washer 24 disposed between the base plate 19 and the base plate 19.
An intermediate plate 25 is inserted between the first and second rising portions 9. The upper surface of the intermediate plate 25 is subjected to a fluororesin process to reduce the coefficient of friction with the base plate 19. The intermediate plate 25 is used in the case of a roller fulcrum, but is unnecessary in the case of a pin fulcrum. As shown in FIG. 14, eight connecting portions 17 are arranged concentrically on the rising portion 9 of the peripheral roof portion 14.

The third embodiment is different from the first embodiment in that the upper surface of the cantilever slab 8 is inclined at a required gradient that rises toward the center of the roof body 14, and the fall prevention fence is provided. (Handrail) 13 is formed of an RC wall body integrated with the top of the side wall 4. Since the RC-made fall prevention fence 13 forms a smooth wall surface without protrusions on the side wall 4 of the tank body 2, the tank 1 can be easily constructed. Although the description of the function and the like of the third embodiment is omitted, the function and the like of the first embodiment can be obtained, and the same effect as that of the first embodiment can be obtained.

FIG. 16 is a longitudinal sectional view of a main part of a tank to which a roof structure according to a fourth embodiment of the present invention is applied, and the same or corresponding parts as in FIGS. Is omitted. In the figure, a slab 8A serving as a peripheral roof portion 7 extends a predetermined length inward from the side wall 4 of the tank body 2 and a predetermined length from the side wall 4 of the tank body 2 to the outside, and is a circle in plan view. It is provided in a ring shape. The upper surface of the slab 8A is substantially horizontal, and defines a horizontal opening H.

The fourth embodiment differs from the first embodiment in that the slab 8A protrudes outside the side wall 4. Although the description of the function and the like of the second embodiment is omitted, the function and the like of the first embodiment can be obtained, and the same effect as that of the first embodiment can be obtained.

As described above, the present invention has been described based on the embodiments of the drawings. However, the present invention is not limited to the above-described embodiments, and may be implemented in any manner unless the structure described in the claims is changed. Can be implemented. For example, the tank main body 2 has been described as an annular planar shape, but may be a polygonal shape or another annular planar shape. The present invention can be applied not only to a case where the tank body 2 is installed on a single tank body 2 but also to a group tank in which a plurality of tank bodies 2 are closely integrated.

The support legs 18 forming the connecting portion 17
The structure of the fastener 21 is not limited to the above embodiment,
What is necessary is just to be able to transmit the shearing force and the vertical force (compression force, tensile force) generated in the connecting portion 17.
Is not limited to the case using the anchor bolt 22, the nut 23, and the washer 24, and may be made of metal having an arbitrary shape and an arbitrary structure. Further, the connecting portion 17 is not limited to the case where the connecting portion 17 is mounted on the upper surface of the rising portion 9 of the peripheral roof portion 7, and is directly mounted on the upper surface of the cantilever slab 8 or the cantilever 10 without providing the rising portion 9. May be placed.

The case where the connecting portion 17 forms a roller fulcrum or a pin fulcrum has been described.
7 may be an elastic supporting fulcrum having intermediate properties. Here, the elastic support fulcrum is the horizontal elastic rigidity (t / c).
A fulcrum that can move in the horizontal direction in proportion to m) and is supported by being restricted from moving in the vertical direction. Further, the case where the connecting portion 17 is placed on the rising portion 9 of the peripheral roof portion 7 and the upper surface of the rising portion 9 is substantially horizontal has been described, but the upper surface of the rising portion 9 has an inclined surface. You may. At this time, the horizontal direction and the vertical direction of the roller fulcrum or the pin fulcrum are read as the parallel direction and the vertical direction of the inclined surface, respectively.

The roof peripheral portion 7 is made of a cantilever slab 8 or a slab 8A, or the cantilever slab 8 and the cantilever 1
Although the example which comprised with 0 was shown, even only the cantilever 10
The same effect can be obtained by forming a plate made of aluminum alloy and / or a beam made of aluminum alloy or concrete. Furthermore, although the cantilever 10 has been described as a form of the beam of the roof peripheral part 7, other supporting conditions, for example, both ends may be supported by a pin fulcrum.

[0097]

As described above, according to the first aspect of the present invention, the roof structure is constructed so as to extend from the side wall of the tank main body to the inside in the lateral direction and the concrete roof structure. Since it is a composite structure combining a metal roof body that closes the horizontal opening defined by the tip of the roof, and a connection part of the roof body joined to the surrounding roof, it is lightweight, A tank roof structure having excellent durability, workability, economy, and flexibility can be provided.

According to the present invention, the tank body integrated with the peripheral roof forms one large solid concrete container structure having a horizontal opening at the top, and the roof body is formed in the horizontal opening of the tank body. It is configured as a lid for closing the part. The present invention reduces the weight of the roof body,
It is characterized by corrosion resistance, and the roof frame made of metal provides light weight and corrosion resistance, and the peripheral roof facilitates the reduction in size and weight of the roof main body.
The reduction in the weight of the roof main body portion has the advantage that the peripheral roof portion and the roof main body portion are formed as independent frames, and that the entire roof main body portion can be lifted.

Next, the corrosion resistance means that the corrosion resistance of the roof frame and the roof surface material should be appropriately configured with respect to the site conditions, the outside air conditions, and the design conditions such as the contents in the storage space. Exhibits the flexibility that can be achieved, especially when the contents are tap water, even when exposed to air (chlorine atmosphere) in which chlorine contained in tap water is vaporized. The durability can be improved by taking advantage of this. Therefore, by making the service life of the roof main body part equal to the service life of the tank main body part, it is possible to provide a tank structure excellent in economic efficiency.

Further, since the roof structure is a composite structure combining a concrete roof and a metal roof main body, it is excellent in weight reduction, corrosion resistance and miniaturization. The PC tank of the present invention eliminates various drawbacks formed by the RC roof shingle.

Further, the peripheral roof portion is formed as a concrete structural member structurally integrated with the side wall of the tank main body, and projects a predetermined length in the lateral direction toward the inside of the tank main body. Therefore, the span length of the roof main body is shortened by the overhang length of the peripheral roof, and the roof main body can be downsized. Then, the peripheral roof portion can be used as an inspection passage through which a person can walk. Therefore, the side wall of the tank main body can be a smooth wall surface without protrusions on the outside. Furthermore, the work of assembling a scaffold at a high place such as the top of the tank body and casting concrete is reduced.

Next, according to the second aspect of the present invention, since the peripheral roof portion is formed of a concrete slab and / or a concrete beam, the peripheral roof portion is transmitted to the roof transmitted through the connecting portion. A structural mechanical mechanism that transmits the vertical force of the main body to the side wall of the tank main body can be configured.
Therefore, it is possible to obtain the same effects as those of the first aspect of the present invention, and it is also possible to easily increase the concrete section thickness of the slab and the beam, and to appropriately secure the cover thickness of the reinforcing bar. Even when exposed to a chlorine atmosphere, concrete can be degraded over time, and thus has excellent durability.

According to the third aspect of the present invention, the peripheral roof portion is formed of an aluminum alloy plate and / or an aluminum alloy or concrete beam. , And further reduction in weight and improvement in corrosion resistance can be achieved.

Next, according to the fourth aspect of the present invention, the peripheral roof portion is formed so as to protrude from the side wall toward the inside in a lateral direction in a required length and is formed in a circular shape in plan view. The planar shape of the roof portion can be freely selected from the planar shape of the side wall of the tank main body portion and any of a similar shape and a non-similar shape. Further, it becomes easy to use the peripheral roof portion as a passage for inspection.

Next, according to the fifth aspect of the present invention, since the floor opening or the cutout is provided in the peripheral roof having an annular shape in plan view, the roof main body can be removed for maintenance and inspection or for ventilation. The floor opening or cutout can be freely opened and closed without removing it.

According to the sixth aspect of the present invention, since the inside of the peripheral roof portion is set to the inside required for the inspection passage, the inspection passage can be provided without projecting outside the side wall.

Next, according to the seventh aspect of the present invention, the upper surface of the peripheral roof portion is formed to be substantially horizontal or inclined at a required gradient rising toward the center portion. Can be used as an inspection passage, and rainwater can be easily drained when inclined at a required slope.

According to the invention of claim 8, the roof surface material is a plate made of aluminum alloy, a metal plate made of iron, stainless steel, copper or the like, a plate made of glass or synthetic resin, or a roof made of a film or the like. Because it is made of roofing materials, the corrosion resistance of the roof surface material is appropriately selected according to the design conditions such as the contents in the storage space, so that the durability of the roof body is improved while reducing the weight of the roof body be able to.

Next, according to the ninth aspect of the present invention, the roof main body resists vertical loads (self-weight, loading load, snow load, etc.) by the roof frame supported by the connecting portion, and has independent structural mechanics. The roof and the roof main body have the same radius of curvature because the roof peripheral part constitutes a structural mechanical mechanism that transmits the vertical load transmitted through the connecting part to the side wall. The restriction of a dome-shaped roof can be eliminated. Therefore, the planar shape and the elevation shape of the roof main body can be freely selected. In particular, the elevation shape of the roof main body can form an aesthetic appearance with less intimidation considering the surrounding environment, and the roof frame can select the optimal structural type in terms of weight, cost, proof stress, etc. .

According to the tenth aspect of the present invention, since the connecting portion is slidable in the horizontal direction with respect to the vertical load and is supported by being restrained from moving in the vertical direction, the vertical load acts on the roof frame. However, only a vertical force (compression force, tension force) is generated in the connection portion, and no shear force is generated. Therefore, due to the temperature difference inside and outside the tank body, the pressure difference, etc.,
Even if a displacement of the horizontal deformation occurs between the top of the tank body and the roof body, the connection portion absorbs the displacement of the horizontal deformation, so that the influence on the roof body is reduced.

According to the eleventh aspect of the present invention, since the connecting portion is supported by being restrained in both the horizontal direction and the vertical direction with respect to the vertical load, even if the vertical load acts on the roof frame, the connecting portion is connected. A shear force as well as a vertical force (compression force and tension force) is generated in the portion 17. However, since the stress generated in the roof frame is reduced, there is an effect that the member cross section is reduced.

Next, according to the twelfth aspect of the present invention, the dome-shaped roof main body is reduced in span length and height (rise) of the roof top, so that it is light and small and has no intimidating feeling. Appearance.

According to the thirteenth aspect of the present invention, it has a versatility capable of storing various kinds of contents such as liquids such as water and petroleum, or solids such as coal, cement and grain. The application range of the present invention can be expanded.

According to the fourteenth aspect of the present invention, the constraint on the vertical movement of the connecting portion of the roof main body is released for the purpose of inspecting and repairing the storage space after completion. Since the whole is lifted up and removed from the tank body, the roof body can be lifted and removed after completion to make inspection and repair of the storage space easier, and at the time of construction, By assembling, lifting and attaching the roof body on the ground, the construction period can be shortened and the cost can be reduced.

Further, according to the invention of claim 15, the invention of claim 1, invention of claim 2, invention of claim 3, and claim 1
The same effect as that of the second invention or the fourteenth invention can be obtained.

According to the sixteenth aspect of the present invention, the roof frame is made of steel or an aluminum alloy.
When the contents are tap water, the durability can be improved by maximizing the characteristics of steel or aluminum alloy even when exposed to air (chlorine atmosphere) in which chlorine contained in tap water is vaporized.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing the principle of a roof structure according to the present invention.

FIG. 2 is a perspective view of a tank to which the roof structure according to the first embodiment of the present invention is applied.

FIG. 3 is a longitudinal sectional view of the tank shown in FIG.

FIG. 4 is a side view of the tank shown in FIG. 2 as viewed obliquely from the side.

FIG. 5 is a plan view of the top of the tank shown in FIG. 2;

FIG. 6 is a plan view showing a state where a tank roof main body shown in FIG. 2 is removed.

FIG. 7 is a perspective view illustrating an example of a configuration of a connecting portion.

FIG. 8 is an explanatory diagram of a stress and a deformation state when a vertical load is applied.

FIG. 9 is an explanatory diagram of a state where a roof main body is lifted.

FIG. 10 is a longitudinal sectional view of a tank to which a roof structure according to a second embodiment of the present invention is applied.

FIG. 11 is a plan view of the tank shown in FIG. 10 in a state where a roof main body is removed.

FIG. 12 is a longitudinal sectional view of a tank to which a roof structure according to a third embodiment of the present invention is applied.

FIG. 13 is a plan view of the top of the tank shown in FIG.

FIG. 14 is a plan view of the tank shown in FIG. 12 with a roof main body part removed.

FIG. 15 is an explanatory diagram showing another example of the configuration of the connecting portion.

FIG. 16 is a longitudinal sectional view of a main part of a tank to which a roof structure according to a fourth embodiment of the present invention is applied.

FIG. 17 is a longitudinal sectional view showing an example of a conventional prestressed concrete tank.

FIG. 18 is an explanatory diagram of features of the tank shown in FIG.

FIG. 19 is a longitudinal sectional view showing another example of a conventional tank having a dome-shaped roof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank 2 Tank main body part 3 Bottom plate 4 Side wall 5 Ridge part 6 Roof structure 7 Peripheral roof part 8 Cantilever slab 8A Slab 9 Rising part 10 Cantilever 11 Floor opening part 12 Notch part 13 Fall prevention fence 14 Roof body Part 15 Roof surface material 16 Roof frame 17 Connecting part 18 Support leg part 19 Base plate 20 Slot 21 Fastener 22 Anchor bolt 23 Nut 24 Washer 25 Intermediate plate S Storage space H Horizontal opening A Contents (Tap water) C Crane work car

 ──────────────────────────────────────────────────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

Claims (16)

[Claims] 1. A tank roof structure installed on the top of a cylindrical tank body having a storage space therein, wherein the roof structure protrudes inward from a side wall of the tank body. A roof portion, and a roof body portion that closes a horizontal opening defined by the peripheral roof portion is configured in combination; the peripheral roof portion is formed integrally with the side wall by concrete; Comprises a roof surface material for covering the roof surface, a metal roof frame for attaching the roof surface material, and a connecting portion attached to the roof frame, wherein the roof body portion is connected to the peripheral roof portion at the connecting portion. A tank roof structure, which is joined. 2. The roof structure of a tank according to claim 1, wherein the peripheral roof portion is a concrete slab, and / or
Or a tank roof structure formed of concrete beams. 3. The roof structure of a tank according to claim 1, wherein the peripheral roof portion is formed of an aluminum alloy plate and / or an aluminum alloy or concrete beam. Characteristic tank roof structure. 4. The roof structure for a tank according to claim 1, wherein the peripheral roof portion is provided to extend in a lateral direction inward from the side wall so as to extend in a lateral direction to have a circular shape in plan view. A roof structure for a tank, which is formed. 5. The tank roof structure according to claim 4, wherein the peripheral roof portion is formed in a plan view annular shape having a floor opening or a notch. Roof structure. 6. The tank roof structure according to claim 1, wherein said peripheral roof portion has a required length with at least an inner dimension required for an inspection passage. Roof structure. 7. The roof structure of a tank according to claim 1, wherein the peripheral roof portion has an upper surface that is substantially horizontal, or an upper surface that is inclined at a required gradient that rises toward the roof main body portion. A roof structure for a tank, which is formed. 8. The roof structure of a tank according to claim 1, wherein the roof surface material is a plate made of aluminum alloy, a metal plate made of iron, stainless steel, copper, or the like, a plate made of glass or synthetic resin, Or a roof structure of a tank, which is made of a roofing material such as a membrane. 9. The roof structure of a tank according to claim 1, wherein the roof main body resists a vertical load such as a dead weight or a snow load by the roof frame supported by the connection portion. The roof structure of the tank, wherein the peripheral roof portion constitutes a structural mechanical mechanism for transmitting the vertical load transmitted via the connecting portion to the side wall. body. 10. The roof structure for a tank according to claim 9, wherein the connecting portion is slidable in a horizontal direction with respect to a vertical load such as a dead weight of the roof main body and a snow load, and moves in a vertical direction. A tank roof structure having a deformability supported by being restrained. 11. The roof structure of a tank according to claim 9, wherein the connecting portion restrains horizontal movement and vertical movement of the roof main body portion against vertical loads such as its own weight and snow load. A tank roof structure having deformability supported and supported. 12. The roof structure of a tank according to claim 1, wherein the roof main body forms a dome-shaped roof having a truss structure by a roof surface material made of an aluminum alloy and a metal roof frame. A roof structure for a tank. 13. The tank roof structure according to claim 1, wherein the storage space stores a liquid such as water or petroleum, or a solid such as coal, cement or grain. Roof structure. 14. The tank roof structure according to claim 1, wherein, after completion, the restraint on the vertical movement of the connecting portion is released for the purpose of inspecting or repairing the storage space,
A roof structure for a tank, wherein the entire roof main body is lifted and detachable from the tank main body. 15. A tank roof structure installed on the top of a cylindrical tank body having a storage space therein, wherein the roof structure extends laterally inward from a side wall of the tank body. A peripheral roof that protrudes with a required length and a roof main body that closes a horizontal opening defined by the peripheral roof are configured in combination, and the peripheral roof is formed integrally with the side wall. The roof body is made of an aluminum alloy covering the roof surface, a metal roof frame for attaching the roof surface material, and A connection portion attached to a roof frame, wherein the roof main body is detachably connected to the peripheral roof portion at the connection portion. 16. The method according to claim 1, wherein:
Item 3. The tank roof structure according to Item 2, wherein the roof frame is made of steel or an aluminum alloy.