JPH0525755B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a storage tank side wall reinforcement structure that is attached to the side wall of an assembled storage tank from outside the tank to ensure the strength of the storage tank.

[Background technology] In recent years, there has been an extremely strong demand for seismic performance in water storage tanks, water receiving tanks, etc., and in general, opposing side walls are connected using reinforcing members, or braces are used that extend diagonally between the side walls and the bottom wall. It has been reinforced.

However, since these reinforcing members are present inside the tank, they cause rust and impede cleaning of the tank interior, and improvements have been desired.

For this reason, attempts have been made to attach a reinforcing member from outside the tank, but these have been impractical due to drawbacks such as the reinforcing effect being incomplete or the reinforcing member protruding beyond the side wall, resulting in a large occupied area.

[Object of the invention] In view of the above facts, the present invention aims to provide a storage tank side wall reinforcement structure from outside the tank that ensures the strength of the storage tank, minimizes the protrusion from the side wall, and does not have sharp protrusions. It is said that

[Structure and operation of the invention] The storage tank side wall reinforcing structure according to the present invention includes a joint part of the flanges of the side wall of a water tank assembled by joining flanges vertically provided at the end of the panel. In the storage tank side wall reinforcement structure to be reinforced,
The first leg is configured of a first leg that comes into contact with the outer surface of one of the flanges, and a first protrusion that is bent and extends from the first leg so as to cover the joint of the flange. one reinforcing member; a second leg portion that abuts against the outer surface of the other flange and holds the joint portion of the flange from the outside between the first leg portion; and the second leg portion that extends from the second leg portion and the a second protrusion that overlaps with the first protrusion to form a closed cross section surrounding the joint portion of the flange, and a second protrusion whose surface that overlaps with the first protrusion is parallel to the joint surface of the flange; and a second reinforcing member. Further, the width of the closed section in the direction along the panel is larger than the thickness of the joint portion of the flange.

In the invention having the above configuration, the side wall of the water tank is assembled by joining the flanges that are vertically provided at the ends of the panels. This flange joint is reinforced by a first reinforcing member and a second reinforcing member. That is, the first leg of the first reinforcing member and the second leg of the second reinforcing member sandwich the flange from the outside to increase the joint strength of the flange, and to substantially strengthen the flange. Increase the shear resistance by increasing the cross-sectional area of the joint. Moreover, by overlapping the first protruding piece and the second protruding piece extending from the first leg part and the second leg part to form a closed cross section surrounding the joint part of the flange. By increasing the section modulus of the first reinforcing member and the second reinforcing member against the bending stress acting on the flange joint, a large resistance force can be exerted against the bending force at the flange joint. Note that this section modulus can be further increased by making the width dimension in the direction along the panel of the closed section larger than the thickness of the joint portion of the flange. In addition, in response to the force that tends to open the joint of the flange, the surface where the first protrusion and the second protrusion overlap is parallel to the joint surface of the flange. The first reinforcing member and the second reinforcing member are configured such that the joint portion of the flange does not separate from force that tries to open due to the overlapping surface of the first protruding piece and the second protruding piece. Therefore, it will not come off unless the member itself breaks.

[Embodiments of the invention] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention, and is a perspective view showing a reinforcing structure fastened to a vertical flange of a side wall of a storage tank.

That is, the individual panels 1 and 2 constituting the side walls are made of steel or FRP, and the flange portions 3 and 4 are provided at the upper and lower ends of the rectangular pressure receiving plate, and the flange portions 5 and 6 are located at the left and right ends, respectively, facing outside the tank. It is erected.
The left flange part 5 of the panel unit 1 and the right flange part 6 of the panel unit 2 and other corresponding flange parts are tightened together, and the side wall is constructed by sequentially performing this tightening operation. do. At the upper and lower ends of this side wall, a ceiling wall and a bottom wall (not shown) are constructed by fastening similar individual panels to each other, and these are interconnected to form a storage tank as a whole.
Therefore, the flange portions 5, 6 of the panel units 1, 2 extend vertically in the longitudinal direction and extend toward the outside of the side wall, and the opposite surface of the flanges forms the storage tank internal space 7.

FIG. 2 is a horizontal cross-sectional view of the main part of FIG. 1, and as shown in this figure, the legs 9 and 10 of the reinforcing member 8 according to the present invention are in a state of sandwiching the flange parts 5 and 6. These are fastened together with mounting bolts 11 and 12. Generally, a sealing material such as a rubber material is sandwiched between the flange portions 5 and 6, thereby providing the ability to prevent water leakage.

In this example, protrusions 1 are attached to the ends of the legs 9 and 10.
3 and 14 are integrally formed, and this includes a wide angle part 15 having a diameter larger than the dimension between the legs, a bent part 16 having an L-shaped cross section facing further outward from this, and a bent part having a U-shaped cross section. 17. A closed cross section is formed by overlapping the protrusions 13 and 14 with the bent portions 16 and 17, and the bent portion 16 is covered with the bent portion 17 and overlapped. The flange portions 5 and 6 are contained in the space 18 within this closed cross section. The outer diameter dimension W of this closed cross section is larger than the dimension D between the leg parts 9 and 10.

As shown in FIG. 1, the reinforcing member 8 is provided vertically in a longitudinal direction over almost the entire area of the left and right flange portions in the vertical direction.

When water is injected into the internal space 7 of a storage tank equipped with such a reinforcing member 8, the flanges 5 and 6 receive a force in the direction of expanding outward due to the water pressure of the stored water, and the reinforcing member 8 absorbs this force. will be received as bending stress. At this time, the reinforcing member 8 is a projecting piece 1 consisting of a pair of legs 9, 10, a wide angle part 15, and bent parts 16, 17.
Since the closed cross section formed by the superposition of No. 3 and No. 3 and No. 14 has a large section modulus, it can sufficiently withstand this bending stress and effectively prevent deformation of the side wall of the storage tank.

In addition, the legs 9 and 10 of the reinforcing member 8 substantially increase the cross-sectional area of the flanges 5 and 6 against shear force in the same direction as the side wall surface that occurs during an earthquake. It is also possible to sufficiently prevent large deformation of the side wall of the storage tank.

Furthermore, in this embodiment, since the overlapping portion of the bent portions 16 and 17 has a special shape, its deformation prevention effect is significantly improved.

That is, by forming the bent portion 19 in which the tip of the bent portion 17 faces the side wall, even greater effectiveness as a reinforcing member can be imparted. To explain this point in detail, the protruding piece 13 is replaced by a protruding piece 14 having a bent portion 19.
Since the protrusions 14 are overlapped at the flange portions 5 and 6, the outward opening of the projecting piece 14 is suppressed by the bending portion 19 that is engaged with the bending portion 16. . In addition, since the protruding piece 13 is surrounded by the bent part 19 against the above-mentioned shearing force,
It prevents the protruding pieces 13 and 14 from moving apart, and also serves as a stopper to stop the left and right openings. When the protrusions 13 and 14 move apart, the flange portions open laterally and cause water leakage, but the effect of preventing this is extremely large.

In addition, the closed cross section of the reinforcing member 8 has no sharp protruding parts to the outside of the storage tank, so it is safe during assembly work, inspection, and other times, and the number of braces, rods, etc. that are passed into the space 7 of the storage tank is reduced. This has many benefits, making it convenient for internal inspection and cleaning work.

Furthermore, since the reinforcing member 8 in this embodiment has a divided structure, one of its features is that it is easy to manufacture, transport, and assemble.

Note that the wide angle portion 15 in the above embodiment may be at a right angle, or may be raised at an obtuse angle as in the illustrated example. , 14 may be provided. Various modifications can also be applied to the protrusions 13 and 14.

FIG. 3 shows a modification of the reinforcing member 8 of the present invention. That is, a to f in FIG. 3 are examples in which the wide-angle portion 15 is formed at an obtuse angle, and g to l are examples in which the wide-angle portion 15 is formed at an obtuse angle.
This is an example in which there is no 5 and protrusions 13 and 14 are provided continuously on the leg portions. Of these, the reinforcing member 8 represented by FIG. 3b is provided with a substrate 20 at the base ends of the legs 9 and 10, which extends along the pressure-receiving surface of the panel alone. Further, the reinforcing member 8 represented by FIG. 3c has an inwardly bent portion 21 at the tip of the protruding piece 13 so as to have a large resistance against bending during an earthquake or the like. Furthermore, Fig. 3 m and n show the board 2 extending from the leg parts 9 and 10 when the flange part provided at the end of the single panel is bent in two steps, unlike the previous example.
This is an example of 0. It goes without saying that in each of these cases, various modifications can be applied to the shapes of the protrusions 13 and 14.

FIG. 4 is a modification to which the present invention is applied, and is an example in which four individual panels are butted together. That is, there are flanges 3 and 4 in the horizontal direction of the panel, and in order to avoid interference with the flanges, the legs of the reinforcing member have cutouts 22 as shown in FIG. . Generally, a reinforcing plate 23 having an L-shaped cross section is fixed to the horizontal flanges 3 and 4 with fasteners 24 such as bolts and nuts. Therefore, as shown in FIG. 6, the reinforcing bracket 25 used in the middle of the reinforcing member 8 has a central recess 27 that presses down the head 26 of the protruding piece 14 of the reinforcing member 8, a leg 28 extending from this, and a reinforcing plate 2.
The base part 29 holds down the head of the panel 3, and by using the free holes provided in the base part 29, bolts and nuts are attached to the panel itself, and in some cases, a long hole is attached to the center as shown in Fig. 7. It is fixed with bolts 31 and 32 from both sides via a nut 30. Of course, in the case of assembling the storage tank side wall when the flanges 3 and 4 are present only on one side, the reinforcing bracket 2
5 may have a base portion 29 only on one side as shown in FIG. Reference numeral 33 in FIG. 7 is a reinforcing plate for firmly fixing the reinforcing bracket 25, which is a flat plate attached along the inside of the side wall. In this case, the flat plate 33 may be integrally provided with a rising protrusion 34, and as the case may be, it is also possible to extend a brace 35 or the like thereto.

As shown in FIG. 4, in a preferred embodiment of the present invention, the upper and lower ends of the reinforcing member 8 are provided with end brackets 36 for holding down the head 26 and connecting them to the panel alone.

An example of this bracket is shown in FIG. 9, and this bracket 36 is similar to the bracket 2 used in the middle.
5, it has a central recessed portion 37, leg portions 38, and a base portion 39, and is fastened to a single panel using a play hole 40 bored in the base portion 39.

[Effects of the Invention] Since the present invention has the above configuration, it is possible to increase the joint strength of the flanges and substantially increase the cross-sectional area of the joint portion of the flanges, thereby increasing the shear resistance. Furthermore, by increasing the section modulus in the bending direction that acts on the flange joint, a large resistance force can be exerted against the bending force at the flange joint. Furthermore, by having a closed cross section, no sharp protrusions are formed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of the storage tank side wall reinforcing structure of the present invention, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. 3 shows a modification of the present invention similar to FIG. 4 is a perspective view showing a second embodiment of the present invention, FIG. 5 is an exploded perspective view showing a reinforcing member used in the second embodiment of FIG. 4, and FIG. 6 is a second embodiment. 7 is a sectional view taken along the line -- in FIG. 4, FIG. 8 is a perspective view showing a modified example of the reinforcing bracket used in the second embodiment, etc., and FIG.
The figure is a perspective view showing an end bracket for fixing the upper and lower ends of the reinforcing member of the present invention. 1, 2... Single panel, 3, 4, 5, 6... Flange, 8... Reinforcement member, 9, 10... Leg, 1
3, 14... Projection piece, 16, 17... Bent part, 18
...Space of loop part, 19...Bending part.

Claims (1)

[Scope of Claims] 1. In a storage tank side wall reinforcement structure for reinforcing the joint portion of the flanges of the side wall of a water tank assembled by joining flanges vertically provided at the ends of panels, one A first leg comprising a first leg that comes into contact with the outer surface of the flange, and a first projecting piece that is bent and extends from the first leg so as to cover the joint of the flange. a reinforcing member, a second leg portion which is in contact with the outer surface of the other flange and which holds the joined portion of the flange from the outside between the first leg portion and the first leg portion which extends from the second leg portion; a second protrusion that overlaps with the protrusion to form a closed cross section surrounding the joint of the flange, and a second protrusion whose surface that overlaps with the first protrusion is parallel to the joint surface of the flange; 2. A storage tank side wall reinforcement structure characterized by comprising: 2 reinforcing members. 2. The storage tank side wall reinforcing structure according to claim 1, wherein the width dimension of the closed section in the direction along the panel is larger than the thickness of the joint portion of the flange.