JPS61259992A - Long-sized steel material for reinforcing outside of built-up storage tank - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reinforcing structure for assembled storage tanks, and particularly to a long steel material mainly used for external reinforcement of water receiving tanks, water storage tanks, etc.

[Background technology and matters to be solved]

In recent years, assembled storage tanks formed by connecting a large number of so-called unit panels have been used as water receiving tanks and water storage tanks in high-rise buildings and the like.

In this case, a unit panel 1 as shown in FIG. 4 is used, and a flange 3 is erected around the pressure receiving surface 2 of the unit panel 1. A large number of unit panels 1 are used, and the flanges 3 are connected to each other with bolts and nuts to form the bottom wall, side wall, and ceiling wall of the storage tank.

Generally, the bottom wall is placed on a frame fixed on a foundation such as concrete, and the side walls are supported with reinforcing materials to resist shaking caused by earthquakes and the like. Until recently, the main method of supporting the storage tank was to reinforce the interior of the storage tank, by placing rods or places between the opposing side walls and between the side walls and the bottom wall.

However, this method is extremely inconvenient during cleaning because the rods and places are strung up horizontally and vertically within the storage tank, and since these reinforcing materials are immersed in the storage liquid, mackerel formation may occur, which is undesirable from a sanitary perspective. Ta.

For this reason, the so-called external reinforcement method, in which the storage tank is reinforced from outside the tank, has come to be used. This is a structure in which a long steel material is applied mainly in the vertical direction to the outward flanges of unit panels forming the side walls.

FIG. 5 is a partially cutaway perspective view showing one example, and FIG. 6 is an end view taken along the line ■--■ in FIG. In the figure, the unit panel 1 is similar to that shown in FIG. 4, and the side wall A is constructed by sequentially connecting flanges 3 to each other. In the side wall A, the flange 3 is assembled facing outward. A cross-sectional connecting member 4 is fastened to both sides of the flange 3 with bolts 5 and nuts 6.
A vane plate 8 made of a long steel material 7 having an H-shaped cross section is connected and fixed to the above-mentioned connecting member 4 using bolts 9 and nuts 1O.

Further, its upper end is supported by a roof rod 11 on the other steel member (not shown) which is similarly connected to the opposite side wall.

On the other hand, the lower end of the long steel material 7 is placed in contact with an overhang 13 that is integrally fixed to a frame 12 represented by an H-shaped steel, and is fixed thereto via bolts 14 and nuts 15. .

FIG. 7 is a side view of this lower end, in which the long steel material 7 is fixed across the vertical unit panel forming the side wall A from side to side, and the wing plate 8.8 of the steel material 7 is shown in FIG. Stiffeners 16 are arranged at equal intervals therebetween. In general, such a stiffener 16 was usually provided at the mutual connection portion of the unit panels 1, 1 arranged in multiple stages in the vertical direction, that is, at the flange 3 portion.

However, the present inventors have found that the load and deflection amount applied to the long steel material 7 vary greatly depending on the position where the stiffener 16 is placed. The purpose is to obtain a long steel material that can improve the strength of an assembled storage tank by specifying the placement position of the stiffener 16 in the rope material 7 in relation to the above.

[Summary of the invention]

The present invention uses a unit panel consisting of a pressure-receiving surface and a flange erected around the pressure-receiving surface, and connects the flanges in sequence to form a multi-stage assembled storage tank in which a plurality of unit panels are connected at least vertically. The long steel material used for external reinforcement is a long steel material that is attached and fixed across the upper and lower flanges of the side wall, and the long steel material has a cross-sectional shape with a plurality of wing plates. A plate is attached and fixed to the flange, and the stiffener located between the blades is shifted upward or downward from the position corresponding to the connecting portion of the upper and lower unit panels.

[Embodiments of the invention]

In FIG. 1, when the tank is full of water, the lowest part of the side wall A of the storage tank receives the maximum force, but the upper and lower ends of the steel member 7 are fixed together. That is, since the upper end is fixed, for example, by the roof rod 11, and the lower end is fixed to the overhang 13 fixed to the frame 12, the amount of deflection is almost negligible.
On the other hand, since the middle part of the side wall A is not fixed, the amount of deflection is large, and in particular, the connecting part between the upper and lower unit panels 1.1 is generally only fixed with bolts and nuts, so the amount of deflection in this part is large. becomes maximum.

In this case, if the stiffener is made of steel located at the connecting portion of the panel, the load will be concentrated at this point, resulting in the phenomenon that the portion with the largest amount of deflection will be further deflected due to the concentrated load.

This can cause water leakage, and there is also the risk of damage in the event of an earthquake.

The present invention makes it possible to distribute the load in the vicinity of the connecting portion of the panel by slightly shifting the stiffener, preferably by shifting it upward. In other words, at a position 10 cm above and below the connecting part of the panel, the load applied at the top is slightly smaller due to water storage, but other than this connecting part of the panel, the flange of the unit panel, the L-shaped connecting member, and the long steel material are applied. It is a composite strengthened part such as, and the strength has been significantly increased. Therefore, by locating the stiffener, where the load is concentrated, preferably slightly above the connection part of this panel, the load is distributed.
It is possible to average the amount of deflection and reduce the amount of deflection of the flange connection portion.

The steel material of the present invention can be used not only when attached and fixed to a flange on one side wall as described above, but also for the connecting part between adjacent side walls, and as a stiffener disposed between blades. By setting - to the above-mentioned positional relationship, it is possible to significantly improve the strength.

[Specific examples of the invention]

Figure 1 shows the combination structure of the storage tank and long steel materials as described above, and each unit panel 1 has a height of 2 m and a width of 1 m.
It is made by RP. A long steel material (SS-41 material) 7 with an H-shaped cross section is attached and fixed to the flange 3, and its wing plate 8 is integrated with bolts and nuts via a connecting member 4 with a cross-sectional shape, which will be described later. , whose upper end is supported by a roof rod 11 to the upper end of a steel member attached to the flange 3 of the opposing side wall.

Further, the lower end is fixed to a projecting portion 13 integrally fixed to the frame 12 with bolts and nuts.

This steel material 7 has a height of 250 m/m, and the blade plate 8 has a height of 12
5m/m, connected at the center, the wall thickness of this central connection part is 6II/II, and the wall thickness of the wing plate 8 is 9m
/s.

As can be seen in this figure, when connecting the flanges 3 of the unit panels 1, the cross-sectional connecting members 4 are fastened together with bolts and nuts from both sides, and the wing plates 8 of the long steel material 7 are fastened to these with bolts and nuts. It is designed to be fixed in place.

This storage tank has a length of 4 m, a width of 3 m, and a height of 4 m, and the length of the long steel material 7 is also 4 m. The stress of this long steel material 7 (
Divide the long steel material 7 into four equal parts from the top and set the top and bottom Local parts of the connection parts of the upper and lower unit panels as a total of 7 locations where the load is applied, and mark them with A, B, etc. in order from the top. Put on.

Now, as experimental example 1, stiffener 16 is used as A, B, D, and F.
, placed at G. In this case, the stress at each point when the water is full is as shown in Table 1, and only point D has a significantly high stress.

However, in the case of Experimental Example 2 applied to the present invention, that is, when the stiffeners 16 are set to A, B, C, F, and G (moved from D to C), points C, D, and E are almost the same. It was found that the stress was distributed extremely uniformly. Looking at the amount of deflection, in Experimental Example 1, the amount of deflection at point D is 7.3 m/
m, and some water leakage was observed.

On the other hand, in Experimental Example 2, there was no phenomenon in which the amount of deflection increased in one part, and the central part of the steel material (C.

D, E) are slightly bent as a whole (approximately 5 m/m)
There was no water leakage at all.

FIG. 2(A) is a horizontal end view similar to FIG. 6 showing a modified example of the long steel material 7 used in the present invention, and is a horizontal end view similar to FIG. The cross section is grooved and the height is increased so that the steel material 7 itself is a long steel material.

FIG. 2(b) shows a long steel material 7 having a groove-shaped cross section. In these cases as well, by positioning the stiffeners (not shown) placed between the blades at specific locations as described above, the load can be distributed from the joints of the unit panels, thereby reducing the amount of deflection as a whole. will decrease.

Figure 3 shows the chevron (L) used between orthogonal side walls A and A'.
In this example, the stiffener 16 should be set at a specific position in relation to the connecting portions of the unit panels 1 and 2.

Table 1 [Effects of the Invention] Since the present invention employs the above-described configuration, it is possible to distribute the load by simply shifting the position of the stiffener slightly, thereby reducing the amount of deflection and eliminating water leakage etc. It has the excellent effect of making itself smaller and lighter.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an example of a steel material used in a test example proving the effects of the present invention, Fig. 2 (a) and (b) are a horizontal end view showing a modified example of the steel material of the present invention, and Fig. 3 4 is a partially cutaway perspective view of a unit panel used for assembling a storage tank, and FIG. 5 is a partially cutaway view of a combination of a storage tank and a long steel material. A perspective view, FIG. 6 is an end view taken along the V+-Vt line in FIG. 5, and FIG. 7 is a side view of the vicinity of the lower end of the long steel material. DESCRIPTION OF SYMBOLS 1... Unit panel, 3... Flange, 4... L wall connection member, 7... Long ft4vi, 8... Long steel wing plate, 11... Roof rod, 12. ... Frame, 13... Overhang, 16... Stiffener-0

Claims (2)

[Claims] (1) A multi-stage assembled storage tank that uses a unit panel with a pressure-receiving surface and a flange erected around the pressure-receiving surface, and connects the flanges in sequence, and is constructed by connecting a plurality of unit panels at least vertically. A long steel material for external reinforcement used for external reinforcement is a long steel material that is attached and fixed across the upper and lower flanges of a side wall, and the long steel material has a cross-sectional shape with a plurality of blade plates. An assembled storage tank characterized in that a plate is attached and fixed to a flange, and a stiffener placed between the blade plates is shifted upward or downward from a position corresponding to a connecting portion of the upper and lower unit panels. Long steel material for external reinforcement. (2) The long steel material for external reinforcement of an assembled storage tank according to claim 1, wherein the long steel material has an H-shape, an L-shape, or a groove shape in cross section.