Storage for hazardous materials in earthquake-prone regions

 

(57) Abstract:

Usage: during the construction of the storage of environmentally hazardous materials in earthquake-prone regions to improve the reliability in seismic impact by creating mnogoseriynogo constructive efforts for efficient use of space and the provision of additional tanks for storage of materials. The inventive storage consists of a group of cylindrical tanks, around which was built toroidal composite shell on the section height of 0.8-1.0 height of the tank is divided into separate compartments of the power diaphragm. Within the Torah at different levels along the height of the cross section are lingering elements consisting of diametrically joined at the center of the torus and the arcuate covering each tank metal ties. The ends of the metal links attached to a force transverse apertures toroidal shell. The space between the tanks and the toroidal shell filled with damping material, sand or genomescan mixture. Around the toroidal shell is erected to the full height of the last compacted earthen wall. 3 Il.

The invention relates to p is x materials (radioactive and toxic waste, oil and oil products, liquefied gas, etc), built in earthquake-prone regions, where the destruction of the tanks during earthquakes can lead to environmental disaster.

Known earthquake resistant reinforced concrete toroidal storage tanks for hazardous materials [1].

A disadvantage of the known design is not sufficiently full use of premises for storage of materials as is not provided for filling the space inside the torus.

Known cylindrical tank for petroleum storage device on the perimeter of the reservoir compensation toroidal shell open cross section, one longitudinal edge of which is attached to the wall, and the other to the bottom of the tank. On the bottom parallel to the partition wall is equipped with the formation between the last and the toroidal shell annular gap filled with non-freezing fluid [2].

A disadvantage of the known design is the unsuitability of the tank to use in the earthquake, because the compensation device only eliminates bending moments arising in the wall and the bottom of the reserve is skim is the storage of oil and oil products, consists of a group of cylindrical tanks, compensatory protective devices and compacted earthen shaft, protecting it from impacts resulting from displacements of the soil [3].

The disadvantages of the known store is its lack of reliability when exposed to seismic loads, due to offsite tanks and the lack of a hard a single structural system.

The technical challenge is to improve the reliability of the storage of environmentally hazardous materials in seismic impact by creating mnogoseriynogo constructive reinforcement for a rational use of space and the provision of additional tanks for storage of materials.

The problem is solved in such a way that in store for environmentally hazardous materials in earthquake-prone regions, including a group of cylindrical tanks, protective compensatory device and compacted earthen shaft, according to the invention a protective compensatory device made in the form divided into compartments force transverse diaphragms composite toroidal shell built around a group of cylindrical reserve the expansion shell protracted elements, consisting of diametrically joined at the center of the torus and the arcuate covering each tank metal ties, the ends of which are anchored in the power of the transverse apertures of the shell, and the space between the tank and the shell is filled with sand or genomescan mixture, and the earth wall built around the toroidal shell to a height of the cross section of the latter.

Offer vault is characterized by the fact that around a group of cylindrical tanks erected protective composite toroidal shell section height, equal to 0.8 and 1.0 times the height of the tank, provided with a forming in the internal volume of the torus separate compartments transverse force diaphragms. Within the Torah at different levels along the height of the cross section of the shell are lingering elements in the form of diametrically joined at the center of the torus and the arcuate covering each tank metal ties. The ends of the ties enshrined in law enforcement transverse apertures of the shell. Thus the space between the containers to the full height filled with sand or genomescan mixture, and around the toroidal shell erected shaft of compacted soil.

The execution of the toroidal shell section height of 0.8-1.0 height-cutting with respect to the axial radius of the circle of the torus to the section height is not more than 5-7 due to its shape itself originally has a high spatial stiffness and seismic stability and greatly can reduce the force of impact within the Torah from seismic loads. With the increase in specified relationship to deform the shell grows, reducing compensation-damping effect. To increase the stiffness and seismic stability of toroidal shell and store tor the tank is provided with an internal power diaphragms, metal lingering elements of internal storage space filled with damping material, and outside storage deboned compacted soil.

In Fig. 1 shows a store in plan; Fig. 2 - section a-a of Fig. 1; Fig. 3 - section b-B of Fig. 1.

Storage for hazardous materials in earthquake-prone regions consists of a cylindrical tank 1, a compact group, around which was built composite toroidal shell 2 section height in the range of 0.8-1.0 height of the cylindrical tank. Toroidal shell 2 is divided into separate compartments force transverse orifice 3. At different levels along the height of the shell is placed a lingering elements 4, consisting of diametrically metal ties 5, connected to the node 6, and curved metal ties 7. The ends of the metal links 5 and 7 is fixed in a force transverse apertures 3 of the shell 2. Space is th mixture. Around the toroidal shell 2 to the full height of the cross section of the shell is formed of compacted earthen shaft 9.

Store erected as follows.

Around a group of tanks 1 toroidal shell 2 built in monolithic form in a double fixed steel formwork or in prefabricated form of separate elements-rings combine between a tension cable fittings (first barrier strengthening). In the wall of the torus-containers can be arranged in the required number of inlet hatches and communication inputs.

To increase the stiffness and seismic stability of toroidal shell suit hard power transverse aperture 3, which divide the interior volume into separate compartments (the second barrier strengthening). The compartments are just additional capacity for storage of materials, substances, fire, ballast water, or technical areas. Aperture 3 perform the role of transverse stiffeners shell and, in addition, dividing the internal space into separate containers, allow more evenly distribute dynamic loads under seismic mass movement of the filling capacity of liquids.

Tallicheskih diametrically links 5, joined at the center of the torus in node 6, and curved links 7, covering each reservoir 1. The ends of the metal ties should be fixed in the power diaphragm 3. Communication 5 different directions in each level are rigidly interconnected at node 6 in the center of the torus. Links 5 are limiters strain tor-capacity in the direction transverse to the direction of horizontal seismic effects, which significantly increases the overall rigidity of the structures and their relationship to the Central node 6 allows for a more evenly to include in the various phases of construction (the third barrier strengthening). Lingering elements 4 for each of the cylindrical tank 1 is formed of an elastic bed, lowering the horizontal displacements of the walls in different height levels due to the transmission caused by seismic impact of efforts on the adjoining plot of toroidal shell 2 (fourth barrier strengthening).

Fixing links 5 and 7 to force the diaphragms 3, giving effort on the shell 2, is carried out by skipping protracted elements 4 through the body of the diaphragm 3 through the appropriate channels with end cap-stops on the outer side of the torus, or by welding the ends of metal links 5 and 7 to steel sakellari 1 and the shell 2 at the final stage of construction fills the entire height of the layer of damping material 8 - sand or genomescan mixture prepared in the form of a solution, containing clay and sand in the ratio 1:10 - 1:15, which provides sufficient viscosity for the formation of skeletal material (fifth barrier strengthening). Then make the outer obalovanie structures compacted soil 9 slope at full height toroidal shell 2 (sixth barrier fortification, than sharply reduce the amount of efforts from various problems, including seismic loads in the top shell by increasing the area of its elastic support.

Thus, the proposed design of the store due to mnogoseriynogo strengthening groups cylindrical tanks for the storage of environmentally hazardous materials in earthquake-prone areas, combining a system of constructive measures, provides a high degree of operational reliability and environmental safety of these facilities.

Sources of information:

1. Certificate of utility model 3504 N, G 21 F 9/22, 16.01.97.

2. USSR author's certificate N494513, E 04 H 7/00, 05.12.75.

3. Reinforced concrete tanks for storage of oil and oil products. Design and construction / edited by T. T. Stulov. -M.: Nedra, 1968, S. 15, 117-160.

Hervartov, protective compensatory device and compacted earthen shaft, characterized in that the protective compensatory device made in the form divided into compartments force transverse diaphragms composite toroidal shell built around a group of cylindrical tanks, section height, equal to 0.8 and 1.0 times the height of the tank, and located inside the torus at different levels along the height of the cross section of the shell protracted elements consisting of diametrically joined at the center of the torus and the arcuate covering each tank metal ties, the ends of which are anchored in the power of the transverse apertures of the shell, and the space between the tank and the shell is filled with sand or genomescan mixture, and the earth wall built around the toroidal shell to the height of the latter.

 

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