JP3448753B2 - Top structure of PC storage tank - Google Patents

Top structure of PC storage tank

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Publication number
JP3448753B2
JP3448753B2 JP21674094A JP21674094A JP3448753B2 JP 3448753 B2 JP3448753 B2 JP 3448753B2 JP 21674094 A JP21674094 A JP 21674094A JP 21674094 A JP21674094 A JP 21674094A JP 3448753 B2 JP3448753 B2 JP 3448753B2
Authority
JP
Japan
Prior art keywords
pc
ring
steel
storage tank
roof
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP21674094A
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Japanese (ja)
Other versions
JPH0860894A (en
Inventor
信一 大山
宏治 石井
Original Assignee
株式会社石井鐵工所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社石井鐵工所 filed Critical 株式会社石井鐵工所
Priority to JP21674094A priority Critical patent/JP3448753B2/en
Publication of JPH0860894A publication Critical patent/JPH0860894A/en
Application granted granted Critical
Publication of JP3448753B2 publication Critical patent/JP3448753B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

Detailed Description of the Invention

[0001]

This invention relates to liquefied natural gas (LN
PC of double shell low temperature storage tank for storing low temperature liquefied gas of G)
The present invention relates to an outer tank having a structure and a storage tank having a PC structure for storing liquids such as oil and water. More specifically, a PC steel material for prestressing is provided in a vertical direction and a circumferential direction inside a concrete side wall, respectively. The present invention relates to a top structure of a side wall for supporting a roof of a PC storage tank in which a steel roof is provided above a side wall of a prestressed concrete structure (PC structure) which is formed by applying tension.

[0002]

2. Description of the Related Art The top structure of a conventional PC storage tank is shown in FIG. The PC storage tank 101 is an outer tank of a double shell low temperature storage tank formed around an inner tank (not shown) that directly stores a low temperature liquefied gas such as liquefied natural gas (LNG).

In this PC storage tank 101, a steel roof 105 is connected to an upper part of a concrete side wall 102 having a PC structure through a steel shell plate 103 and a compression ring 104. Even if the liquid flows out, a seal plate 111 and an airtight seal plate 111 are provided on the inner surface of the side wall 102 so that the liquid can be safely received.
A seal ring 112 that connects the upper edge of the body 1 and the body plate 103 is provided.

The concrete side wall 102 has a steel roof 1 on the side wall top 106 at the upper edge of the cylindrical side wall body 114.
In order to support 05, a ring beam 115 made of reinforced concrete having an increased wall thickness is integrally formed on the side wall top portion 106.

The tubular side wall body portion 114 stands vertically on the concrete structure in which the reinforcing bars 110 are arranged, separated from the outer periphery of the bottom slab (not shown) to which the lower edge of the side wall body portion 114 is connected. PC steel material 107 such as raised PC steel rod, and the PC
A PC steel material 108 such as a PC stranded wire is arranged in a ring shape on the outer periphery of the steel material 107 so as to be spaced from the bottom plate to the upper portion.
It is made of prestressed concrete structure of C structure.

In the side wall 102, the reinforcing bar 110 and the PC steel materials 107 and 108 are arranged in the side wall body 114, concrete is poured, and after a predetermined curing period, a predetermined concrete strength is obtained. The steel materials 107 and 108 are tensioned to introduce prestress to the concrete for construction. After introducing pre-stress, P placed vertically
The C steel material 107 is fixed by a fixing tool 109 at the upper end.

Vertical PC steel 107 and circumferential PC
The pre-stress introduced into the steel material 108 is applied in each of the vertical direction and the circumferential direction so that the outer tank can safely receive the stored liquid that flows out when the inner tank of the double shell low temperature storage tank should be destroyed. It is a tension force corresponding to the pressure of the effluent and the gas pressure.

Vertical PC steel material 107 of the side wall body 114
After the pre-stress introduction and fixing of the fixing tool 9 are finished,
A ring beam 115 made of concrete and having a wall thickness increased in a ring shape is applied to the top portion 106 of the side wall at the upper end.

This ring beam 115 has a steel roof 1
In order to support the load of 05, etc., the steel body plate 103 and the anchor plate 113 at the lower end thereof are provided with the reinforcing bars 110, and then the concrete is poured to form the upper part of the body plate 103. The roof 105 made of steel is installed through the compression ring 104.

[0010]

The conventional PC described above is used.
The top structure of the storage tank had the following problems. Side wall top 10
6 not only supports heavy vertical loads such as the steel roof 105 and the body plate 103, but also supports a horizontal force and a rotational moment that largely act on the lower part of the body plate 103 due to the load of the effluent and the gas pressure. The ring beam 115 having a concrete structure with an increased wall thickness had to be integrally formed on the upper portion thereof.

Further, the ring beam 115 has a sidewall top portion 1
A large number of rebars 110 are required to form a solid one-on-one piece on 06.
3 through the many holes provided in the lower part, and body plate 10
Since the anchor plate 113 in the lower part of 3 also has to be firmly fixed to the member such as the reinforcing bar 110, the structure is complicated and a lot of labor is required for construction.

Further, in concrete casting of the ring beam 115, a large amount of concrete material or the like must be applied from both inside and outside in a state in which the inside and outside are shielded by the body plate 103 standing upright in a high wall shape. The work was difficult and the construction was difficult.

The above-mentioned problems are caused by the P of the double shell low temperature storage tank.
This is a detailed description of the case of the C-structure outer tank, but even in the top structure of a PC storage tank that directly stores liquids such as oil and water, it is necessary to form a ring beam with an increased wall thickness. There were similar problems such as difficult construction due to the complicated structure.

The present invention has been made in view of the above-mentioned problems, and has a simple structure, does not become excessively large, is easy to construct, can be constructed efficiently and economically, and can withstand a load or a rotation moment of a roof or the like. It provides a strong structure for the top of the PC storage tank.

[0015]

[Means for Solving the Problems] P of the invention according to claim 1
The top structure of the C storage tank is a PC storage tank provided with a side wall of a PC structure in which PC steel materials are respectively arranged in a vertical direction and a circumferential direction inside a concrete side wall, and a steel roof connected above the side wall. Abut directly on the top edge of the top of the side wall of
A side ring member is provided and the side ring member is a side wall.
Airtight connection to the upper end of the seal plate formed on the inner surface
And the outer side circle of the PC steel material vertically arranged inside the concrete side wall located outside the entire side ring member.
PC steel material is arranged in the circumferential direction , and the press provided by the PC steel material
It is formed so that the influence of the trest extends to the side ring member, and the roof is directly attached to the side ring member.

According to a second aspect of the present invention, there is provided a top structure of a PC storage tank, wherein a side wall of the PC structure in which PC steel materials are respectively arranged in a vertical direction and a circumferential direction inside a concrete side wall, and a concrete ring at the top of the side wall. a cylinder plate buried under the beam, in the PC storage tank provided with a steel roof that connects to the barrel plate, are embedded in the concrete ring beam Tei
That the outer periphery of the body plate portion, from the roof to receive the lower portion of the shell plate
Rotational moment due to load and gas pressure inside the PC storage tank
It is formed by arranging a PC steel material that gives a prestress of a compressive force corresponding to a horizontal force .

[0017]

The top structure of the PC storage tank of the invention according to claim 1 is
The side wall that directly abuts the upper edge of the side wall top of the inner side wall of the PC structure.
And the side ring member is provided on the inner surface of the side wall.
Airtightly connect to the upper end of the seal plate formed on
One outer peripheral side circumferential PC steel material arranged in the vertical direction of the inner concrete side wall positioned outside of the entire said side ring members
The PC steel material disposed on, prestress the PC steel gives
And the roof is directly attached to the side ring member, the whole side ring member is in direct contact with the side wall to form an integral airtight structure. Since the side ring member does not project upward from the top of the side wall, the rotation moment generated by the load from the roof is small, and the rotation moment becomes the shoulder of the upper edge of the inner surface of the side wall and is reinforced. The member can directly receive and disperse and easily support.

Further, since the roof is directly attached to the side ring member provided at the upper edge of the inner surface of the concrete side wall in which the PC steel material is arranged, the rotational moment and the horizontal force due to the load from the roof are It is supported by the prestressing of the circumferential PC steel material located on the outer peripheral side of the entire side ring member, that is, the compressive force. Therefore, the side wall portion provided with the side ring member can be thinned without increasing the thickness as in the conventional case, and can be formed to have the same thickness as the other side wall portions.

Further, the top of the PC storage tank of the invention according to claim 2
In the structure, it is embedded in the concrete ring beam
From the roof that the lower part of the body plate receives on the outer periphery of the body plate where
Moment due to load on the PC and gas pressure inside the PC storage tank
And pre-stressing compressive force corresponding to horizontal force
That since the PC steel material is disposed, the rotational moment and horizontal force of the body plate bottom caused by the load, etc., from the roof, the upper
It is supported by the prestressing of the compressive force applied to the PC steel material arranged on the outer periphery of the body plate at the portion embedded in the ring beam .

That is, in order to reduce the force exerted on the outside of the lower part of the body plate by the compressive force of the PC steel material caused by the load from the roof, etc., the ring beam in which the body plate is embedded should be thick as in the conventional case. It is possible to form a structure having durability, which can be formed thin without cracking in concrete. Furthermore, since the force acting on the lower part of the body plate itself is also reduced, it is possible to reduce the reinforcement of the reinforcing bars and the like arranged on the lower part of the body plate.

Further, as described above, in the top structure of the PC storage tank according to the present invention, the number of connecting members between the side wall and the roof is reduced, so that the structure is simplified and the weight is reduced to facilitate the construction and the roof is also provided. It has a strong structure against loads and moments.

[0022]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional explanatory view in which a part of the top structure of a PC storage tank of the invention according to claim 1 is cut away. The PC storage tank 1 is an outer tank of a double shell low temperature storage tank having a seal plate 11 provided on the inner wall surface, and is provided with a side wall 2 having a PC structure and a steel roof 5 to form a sealed body.

The side wall 2 of the PC structure is provided with a PC steel material 7 such as a PC steel rod in the vertical direction and a PC steel material 8 such as a PC stranded wire in the circumferential direction, and the PC steel material 7 provided is concrete. After the casting, a prestressing tension is applied at a time when a predetermined strength is obtained, and the fixing tool 9 is used for fixing.

The side ring member 14 directly abuts on the upper edge of the side wall top 6 of the inner surface of the side wall 2 without providing a protruding connecting member such as a body plate as in the conventional case, and the seal plate 11 formed on the inner surface of the side wall 2. It is formed by airtightly connecting to the upper end of the.

The side ring member 14 has a flat upper surface and an inverted L-shaped section as shown in the figure so that the roof plate constituting the roof 5 can be easily airtightly connected to the roof 5 when the load on the roof 5 is small. When a large load is applied to the roof 5 or the like, a steel member having a T-shaped cross-section with high cross-sectional performance is selected. Select the mode.

Further, in the inner circumferential direction of the side wall 2 located on the outer peripheral wall of the side ring member 14, P such as PC steel strand is formed.
C steel material 8A is arranged. That is, the PC steel material 8A is arranged and formed so that the side ring member 14 is affected by the prestressing of the PC steel material 8A.

The steel roof 5 consisting of the roof frame and the roof board is
A roof plate is arranged on the upper surface of the side ring member 14 and airtightly joined thereto, and a roof frame is joined to a bracket or the like provided on the side ring member 14 to form the roof 5 directly attached to the side ring member 14.

After forming as described above, PC steel material 8A
Is the load from the roof 5 that the side ring member 14 receives and PC
The rotational moment due to the gas pressure in the storage tank 1 and a compressive force for reducing the horizontal force are applied to fix the tension, so that the thickness of the side wall top 6 portion where the side ring member 14 is provided is the same as the conventional one. It is not necessary to form it thickly, and the other side wall 2
It can be formed to the same thickness as the portion.

Also, the side ring member 14 and the roof 5 are
Since there is nothing provided on the PC steel material 7 unlike the conventional body plate, the PC steel material 7 is not affected by the tension of the PC steel material 7 arranged inside the side wall 2 and the fixing timing.
Since the tension and fixation of the can be preceded, and the construction can be done independently in parallel, the construction period can be greatly shortened as a result.

It should be noted that what is shown by hatching on the illustrated PC steel material 7 is a cover of mortar or the like provided for the corrosion prevention of the fixing tool 9 and is omitted when masking such as painting. You can

An embodiment of the top structure of the PC storage tank of the invention according to claim 2 is shown in FIG. PC storage tank 1 shown in this embodiment
Is formed by connecting a steel body plate 3 to the side wall top 6 of the side wall 2 of the PC structure, and connecting a steel compression ring 4 and a roof 5 to the upper part of the body plate 3 to form an inner surface of the concrete portion. Is an outer tank having a PC structure of a double shell low temperature storage tank in which a seal plate 11 and a seal ring 12 are respectively provided to be airtight.

In the drawing, 7 is a vertical PC steel material, 8 is a circumferential PC steel material, 9 is a fixing tool for the PC steel material, 10 is a reinforcing bar, and the upper edge of the side wall 2 has a body plate 3 A concrete ring beam 15 for embedding and supporting the lower and lower anchor plates 13 is formed, and a PC steel material 8B is arranged on the outer periphery of the body plate 3 embedded in the ring beam 15.

The ring beam 15 is provided with the reinforcing bar 10 after the PC steel materials 7 and 8 on the side wall 2 are tensioned and fixed.
The body plate 3, the anchor plate 13 and the PC steel material 8A are arranged, and the side wall top portion 6 is formed by splicing concrete.

Further, the PC steel material 8B is given a prestress of a compressive force corresponding to the load from the roof 5 which is received by the lower part of the body plate 3, the rotational moment due to the gas pressure in the PC storage tank 1 and the horizontal force. It becomes tense and fixed.

In this way, the PC beam 8 is attached to the ring beam 15.
By arranging B and applying prestress, the force acting on the outside of the lower part of the trunk plate 3 caused by the load from the roof 5 is reduced, so that the thickness of the ring beam 15 does not increase and the side wall 2 does not increase. Since they can be formed to have the same thickness and the amount of reinforcing bars to be arranged can be reduced, the ring beam 15
It is possible to reduce the weight and improve the strength.

The first and second embodiments described above are
A seal plate 11 and a seal ring 12 are provided on the inner surface of the side wall 2.
The top structure of the PC storage tank according to the present invention has been described in detail by taking as an example an outer tank of a double shell low temperature storage tank having a gas-tight structure provided with a seal plate 11 and a seal ring 1.
The present invention can be similarly applied to a PC storage tank that is formed in a liquid-tight structure by coating or the like without providing 2, and that is, a top structure of a PC storage tank that directly stores a liquid such as oil or water.

[0037]

The top structure of the PC storage tank of the invention according to claim 1 has a side ring that directly abuts on the upper edge of the side wall top of the inner surface of the side wall.
And the side ring member is formed on the inner surface of the side wall.
It is connected to the upper end of the formed seal plate in an airtight manner, and is P on the outer peripheral side of the PC steel material vertically arranged inside the concrete side wall located outside the entire side ring member.
C steel material is provided and the prestressed by the PC steel material
Since the side ring member is formed so that the influence is exerted on the side ring member and the roof is directly attached to the side ring member, the side ring member receives a rotational moment due to a load from the roof and a horizontal force in the vertical direction. Arranged PC
Since it can be reduced by the compressive force of PC steel materials arranged in the circumferential direction on the outer peripheral side of the steel material, the roof and side walls are integrally airtight
The structure can be achieved, the number of connecting members can be reduced, and the thickness of the top of the side wall can be reduced, resulting in sufficient strength.
And can have an economical structure.

The top of the PC storage tank of the invention according to claim 2
Department structure is embedded in the concrete ring beam
From the roof that the lower part of the body plate receives on the outer periphery of the body plate where
Moment due to load on the PC and gas pressure inside the PC storage tank
And pre-stressing compressive force corresponding to horizontal force
Since it is formed by arranging PC steel material, the lower part of the body plate receives
The rotational moment and horizontal force to the compression force of the PC steel that
Thus it is possible to suppress directly, by reducing the thickness of the concrete ring beam can be the same thickness as the other side wall, also it is possible also to reduce distribution amount of the reinforcing bars, construction is easy A structure having sufficient strength can be obtained.

As described above, in the top structure of the PC storage tank according to the present invention, the connecting member between the concrete side wall and the roof can be simplified and lightened to facilitate the construction, and sufficient strength can be obtained. .

[0040]

[Brief description of drawings]

FIG. 1 is an explanatory cross-sectional view with a part cut away showing a top structure of a PC storage tank according to a first aspect of the invention.

2 is a cross-sectional view that lacking a portion indicating <br/> the top structure of the PC storage tank of the invention according to claim 2.

FIG. 3 is a partially cutaway cross-sectional explanatory view showing an example of a conventional top structure of a PC storage tank.

[Explanation of symbols]

1, 101 ... PC storage tank 11,111 ... Seal plate 2, 102 ... Side wall 12,112 ... Seal ring 3, 103 ... Body plate 13,113 ... Anchor plate 4,104 ... compression ring 14 ... Side ring member 5,105 ... Roof 114 ... Side wall body 6, 106 ... Sidewall top 15,115 ... Ring beam 7,107 ... PC steel 8, 8A, 8B, 108 ... PC steel 9,109 ... Fixing tool 10,110 ... Rebar

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) E04H 7/20 E04H 7/18 302 E04H 7/06 302 B65D 90/08 F17C 13/00 301

Claims (2)

(57) [Claims]
1. A side wall of a PC structure in which a PC steel material is respectively arranged in a vertical direction and a circumferential direction inside a concrete side wall,
In a PC storage tank provided with a steel roof connected to an upper side of the side wall, a side phosphorus directly contacting an upper edge of the side wall top of the inner surface of the side wall.
The ring member is provided on the inner surface of the side wall.
The PC steel material is airtightly connected to the upper end of the formed seal plate, and the PC steel material is circumferentially disposed on the outer peripheral side of the PC steel material disposed vertically inside the concrete side wall located outside the entire side ring member. Arranged and prestressed by the PC steel
And a roof is directly attached to the side ring member, and the top structure of the PC storage tank is formed.
2. A side wall of a PC structure in which a PC steel material is respectively arranged in a vertical direction and a circumferential direction inside a concrete side wall,
A cylinder plate buried under the concrete ring beam of the side Kabeitadaki unit, the PC storage tank provided with a steel roof that connects to the barrel plate, are embedded in the concrete ring beam
The roof of the lower part of the shell plate on the outer periphery of the shell plate
Rotating momentum due to load from the above and gas pressure inside the PC storage tank
Compressive force pre-stress that corresponds to
PC formed by arranging PC steel
The top structure of the storage tank.
JP21674094A 1994-08-19 1994-08-19 Top structure of PC storage tank Expired - Fee Related JP3448753B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21674094A JP3448753B2 (en) 1994-08-19 1994-08-19 Top structure of PC storage tank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21674094A JP3448753B2 (en) 1994-08-19 1994-08-19 Top structure of PC storage tank

Publications (2)

Publication Number Publication Date
JPH0860894A JPH0860894A (en) 1996-03-05
JP3448753B2 true JP3448753B2 (en) 2003-09-22

Family

ID=16693194

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21674094A Expired - Fee Related JP3448753B2 (en) 1994-08-19 1994-08-19 Top structure of PC storage tank

Country Status (1)

Country Link
JP (1) JP3448753B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5516963B2 (en) * 2010-04-12 2014-06-11 清水建設株式会社 Ground PC tank
JP5935203B2 (en) * 2011-08-26 2016-06-15 株式会社石井鐵工所 Liquid-banking integrated steel plate lining atmospheric concrete tank
JP2017128349A (en) * 2016-01-19 2017-07-27 株式会社Ihi Construction method for double shell tank

Also Published As

Publication number Publication date
JPH0860894A (en) 1996-03-05

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