JP3082165B2 - Method of arranging PC steel material on top of sidewall of cylindrical structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for arranging a PC steel material on the top of a side wall of a cylindrical structure for storing low-temperature liquefied gas such as LNG and LPG, crude oil, water and the like.

[0002]

2. Description of the Related Art In general, in order to construct a cylindrical tank for storing low-temperature liquefied gas such as LNG and LPG, crude oil, water, etc., a roof is provided to protect the stored matter from the weather and to maintain airtightness. Can be The roof is often provided in a dome shape with reinforced concrete or metal. The dome is structurally stable if constrained so as not to deform the root portion. Therefore, usually, the deformation of the root portion is restrained by a PC steel material or the like at the top of the side wall.

FIG. 6 is a vertical sectional view of a conventional cylindrical tank 101, and FIG. 7 is a horizontal sectional view of the cylindrical tank 101 shown in FIG. FIG. 6 is a vertical sectional view taken along line DD of FIG. Cylindrical tank 101 is ground 1
03, a cylindrical side wall 105 is provided, a roof 107 is placed, and a storage material such as LNG 109 is stored inside.

In order to support the force applied from the roof 107 to the side wall 105, a predetermined number of PC steel materials 111a, 111b,... Are arranged at the top of the side wall 105 of the cylindrical tank 101 at the base of the roof 107. I do. Each PC
The steel materials 111a, 111b,.
Are tensioned and fixed at the pilaster portions 113a, 113b,.

Generally, the number of PC steel materials 111 arranged in the side wall 105 is appropriately selected according to the diameter of the cylindrical tank 101 so that the side wall 105 is surrounded by two or three PC steel materials 111.

FIG. 8 is a diagram showing the force acting on the base of the roof 107. Sh is the horizontal force by the roof 107, Sv is the vertical load by the roof 107, S is the resultant force of the horizontal force Sh by the roof 107 and the vertical load Sv by the roof 107, Ph
Is the horizontal force of the PC steel 111. As shown in FIG. 8, a dome-shaped roof 10 is formed by a horizontal force Ph that is tightened toward the center of the cylindrical tank 101 made of PC steel 111.
7 to resist the outward horizontal force Sh at the base.

That is, the end of each PC steel material 111 is
Tension is applied to the PC steel material 111 by being fixed by the pilaster portion 113 protruding from the portion 05, and the horizontal force at the root portion of the roof 107 is canceled by the tension.

When the size of the cylindrical tank 101 is small and the load on the roof 107 is small, the horizontal force Sh due to the roof 107 is also small.

[0009]

However, when constructing a large-scale tank by the conventional method, the roof 1
07 also increases, and the binding force to be secured by the PC steel material 111 also increases. Therefore, it is necessary to increase the amount of the PC steel material 111 to be arranged, and there are the following problems.

(A) A number of PC steel materials 111 are arranged and pulled out to pilaster portions 113a, 113b,.
For fixing, it is necessary to make the top of the side wall 105 thick.

(B) In order to fix the end portions of many PC steel materials 111, the size of the pilaster portion 113 becomes large, and the number of the pilaster portions 113 becomes large, so that the construction becomes difficult, and it is not preferable from the aesthetic point of view.

(C) A scaffold is required for the pilaster portion 113 for placing and tensioning the PC steel material 111,
Construction safety is reduced.

(D) The construction cost increases due to an increase in the construction amount of the pilaster portion 113 and an increase in the thickness of the side wall 105.

(E) PC steel 11
1 to pull out one end of the side wall 10
5 need to be cut in large numbers, and the side walls 10
5 is structurally weak.

The present invention has been made in view of such a problem, and its object is to cope with a large-sized cylindrical structure requiring a large introduction force, and has high safety and high construction cost. An object of the present invention is to provide a method of arranging a PC steel material at the top of a side wall of a cylindrical structure, which is inexpensive, can easily arrange a PC steel material without cutting an outer reinforcing bar of a side wall, and can easily perform a tensioning operation or the like.

[0016]

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a cylindrical structure in which a roof is constructed on a side wall, wherein a PC steel material is provided on a top portion of the side wall, and the PC steel material is provided. The side wall of a cylindrical structure, wherein the PC steel material is disposed such that one end is inside the side wall and the other end is outside the side wall, and both ends of the PC steel material are fixed at a top end of the side wall. This is the method of arranging the top PC steel.

[0017]

According to the present invention, a PC is provided at the top of the side wall of a cylindrical structure.
A PC steel material is provided so that both ends of the steel material are fixed on the top end surface of the side wall, and supports the outward horizontal force by the roof built on the side wall to stabilize the cylindrical structure.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment will be described below in detail with reference to the drawings. Here, the cylindrical structure is described as being a cylindrical tank 1 for storing LNG.

FIG. 1 shows a cylindrical tank 1 according to this embodiment.
FIG. The ground 3 is excavated, and a cylindrical reinforced concrete side wall 5 is provided in the excavated portion. When placing the dome-shaped roof 7 on the upper part of the side wall 5,
Are provided at the top of the side wall 5 to support the force applied to the side walls 5. In the inside of the cylindrical tank 1, a storage material such as LNG 9 is stored.

FIG. 2 shows a PC steel material 1 according to the first embodiment.
FIG. 2 is a horizontal cross-sectional view showing an arrangement of the cylindrical tank 1 and is a horizontal cross-sectional view of the cylindrical tank 1 shown in FIG. FIG. 1 is a vertical sectional view taken along line BB of FIG. FIG. 3 is an explanatory view in which the side wall 5 showing the arrangement of the PC steel material 11 in the first embodiment is developed. FIG. 4 is a plan view showing the side wall 5 showing the arrangement of the PC steel material 11 in the first embodiment. FIG.

A predetermined amount of PC steel material 11 is provided at the top of the side wall 5 of the cylindrical tank 1 at the root of the roof 7.
a, 11b,... are arranged. At this time, each of the PC steel materials 11 having a curved shape corresponding to the curvature of the side wall 5 is arranged such that one end of the PC steel material 11 is located on the center side of the cylindrical tank 1 and the other end is located on the outer peripheral side. Next, each PC steel material 11a, 11b, ...
Is fixed at the fixing portion 15 of the top end 13 of the side wall 5.

Generally, a PC steel material 11 arranged in the side wall 5
Is set to 1/2 or 1/3 of the circumferential length of the tank side wall, and is arranged so as to surround the side wall 5 while being sequentially shifted in the circumferential direction. The length of one PC steel material is appropriately selected according to the diameter of the cylindrical tank 1.

The position of the fixing portion 15 is adjusted so as to be balanced on the circumference of the top end 13 of the side wall 5 depending on the number of the PC steel materials 11, and the fixing position is shifted so as not to overlap at the top end 13.

As described above, according to the first embodiment, since the force of the PC steel material 11 can be effectively applied, it is possible to cope with a large cylindrical structure requiring a large introduction force.
It is not necessary to increase the thickness.

In addition, P is cut without cutting the outer reinforcing bar of the side wall 5.
Since the C steel material 11 can be easily arranged and the side wall 5 is not damaged,
The structural strength as a whole can be maintained.

Further, since all the PC steel materials 11 are arranged in the same shape, the attachment of the PC steel materials 11 and the management of the tension work are easy.

Further, since the fixing portions 15 are disposed at the top end 13 of the side wall 5 in a dispersed manner, the pilaster portion which was conventionally required becomes unnecessary, and the scaffolding work required for the construction in the pilaster portion is unnecessary. High safety. As a result, construction costs can be reduced.

Next, a second embodiment will be described. Second
The embodiment is required in the following case.
First, structurally, more PC steel is required than in the first embodiment, and it is difficult to fix the PC steel at the top of the side wall 5 with the arrangement of the PC steel 11 in FIGS. 2, 3 and 4. . Further, this is the case where the shearing force inside and outside the side wall 5 is too large.

FIG. 5 is an explanatory view in which the side wall 25 showing the arrangement of the PC steel in the second embodiment is developed in a plane.
FIG. 5 is a diagram corresponding to FIG. 4 of the first embodiment. In FIG. 5, the PC steel materials arranged by the methods shown in FIGS. 2, 3, and 4 are referred to as outer PC steel materials 21a, 21b,.
Inside 1, inner PC steel materials 23 a, 23 b,... Are arranged so as to be inclined in a direction opposite to the direction of the outer PC steel material 21 and cross the outer PC steel material 21 in a plan view.

As described above, according to the second embodiment, even when more PC steel is required than in the first embodiment, or when the shearing force on the inside and outside of the side wall is too large, the PC steel is appropriately used. It can be arranged at a suitable position, and the shearing force can be reduced.

[0031]

As described in detail above, according to the present invention, it is possible to cope with a large cylindrical structure requiring a large introduction force, it is safe and the construction cost is low, and the outer reinforcing bar on the side wall is provided. Therefore, it is possible to provide a method of arranging the PC steel material at the top of the side wall of the cylindrical structure, in which the PC steel material can be easily arranged without cutting, and the tension work or the like is easy.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a cylindrical tank 1 in the present embodiment.

FIG. 2 is a horizontal sectional view showing the arrangement of the PC steel material 11 in the first embodiment.

FIG. 3 is an explanatory view in which the side wall 5 showing the arrangement of the PC steel material 11 in the first embodiment is developed.

FIG. 4 is an explanatory view in which a side wall 5 showing an arrangement of PC steel materials 11 in the first embodiment is developed in a plane.

FIG. 5 is an explanatory view in which a side wall 25 showing the arrangement of PC steel materials 111 in the second embodiment is developed in a plane.

FIG. 6 is a vertical sectional view of a conventional cylindrical tank 101.

FIG. 7 is a horizontal cross-sectional view of the conventional cylindrical tank 101 taken along line CC.

FIG. 8 is a diagram showing the force acting on the base of the roof 107.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cylindrical tank 3 ... Ground 5 ... Side wall 7 ... Roof 9 ... LNG 11 ... PC steel 13 ... Top end 15 ... Fixing part 21 ... Outside PC steel material 23 Inside PC steel material 25 Side wall

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-4110 (JP, A) JP-A-61-11380 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04H 7/18 B65D 90/02 F17C 3/00

Claims (2)

(57) [Claims] 1. A cylindrical structure in which a roof is constructed on a side wall, wherein a PC steel material is provided on a top of the side wall, and one end of the PC steel material is provided.
Is inside the side wall, and the other end is outside the side wall.
And the both ends of the PC steel are placed on the side
A method of arranging a PC steel material at a top of a side wall of a cylindrical structure, wherein the steel material is fixed at a top end of the wall . 2. The method according to claim 1, wherein some of the plurality of PC steels are arranged so as to cross each other when viewed two-dimensionally. .