DE3625606A1 - FOUNDATION FOR THE STORAGE OF BALL CONTAINERS - Google Patents

Description

Foundation for the storage of spherical containers for the absorption of liquids, Liquid gases or gases under pressure or in an unpressurized state from a spherically preformed concrete foundation, one cast into it Pipe system and an elastomeric bedding layer on the Ball container rests.

Ball container for holding liquid or gaseous goods either on supports, which usually attack the spherical equator, or on one Be stored, which carry away the loads occurring in the Allow foundation into it. In the latter area storage two principles can be distinguished, namely sand bed storage and the elastomer bearing.

The sand bed storage can be characterized as follows: On a in A sand filling is placed in the concrete slab is held together by an outer limiting ring. The ball Container is stored on this sand filling, that of the spherical outer surface the ball container is adapted.

In the case of elastomer storage, a steel auxiliary bearing shell, which can also be adapted to the spherical outer surface of the spherical container must, an elastic layer in the form of pillows glued on. The between The remaining columns of pillows will appear after assembling the ball container through holes in the auxiliary bearing shell from below with a filled with elastic mass. Finally, the auxiliary bearing shell is on concreted, so that a closed system ball container-bedding-concrete foundation is created.

Another development of an elastomer bedding is based on the waiver on the auxiliary bearing shell. On the convex surface of the lower spherical cap The container is made of elastomer mats in several layers Copolymer glued on or flamed or directly from a mobile Extruder hot applied in the entire required thickness. Then the coated spherical cap is rotated by 180 ° C and in laid a spherically preformed concrete foundation. After completing  Ball container assembly is a tube system in the concrete foundation Low-shrinkage cement paste pressed and thus a closed connection achieved between the foundation and the elastomeric intermediate layer.

The surface storage principles described have the following disadvantages: the sand bed storage results from the inelastic behavior of the Sand, depending on the load, more or less large gaps between ball container skin and bedding. To protect against corrosion on the lower spherical cap therefore need extensive security measures be taken.

The solution using an auxiliary bearing shell requires many different operations, even at great time intervals attack. The construction of the auxiliary bearing shell itself is very complex, the overall system is therefore too expensive from an economic point of view.

The solution with the help of an elastomer bedding without an auxiliary bearing shell brings difficulties in turning the coated lower Spherical cap with itself. Signs of detachment are the right thing heavy elastomeric bedding layer possible. This creates an additional Corrosion protection necessary for the duration of the ball container assembly.

The invention has for its object a technically safe and at the same time economical ball bedding without complex corrosion to achieve protection.

This object is achieved in that the elastomer Bedding layer consists of a liquid plastic, which after the Place in a defined gap between the concrete foundation and the lower one Spherical cap hardens.

An embodiment of the invention is shown in the drawing and is described in more detail below:

Show it:

Fig. 1 is a general overview,

Fig. 2 details of the elastomeric bedding, and

Fig. 3 shows the state of assembly around the lower ball container area.

The surface of a concrete foundation 2 embedded in the ground 1 - this can be pile-based in poor subsoil conditions - is adapted to the shape of the spherical container with a rotatable template so that an outwardly widening gap between the concrete foundation and spherical container 3 can be set. A smooth line on the spherical surface should allow the liquid plastic to be introduced correctly and the surface water that may occur during the assembly time should lead to the lower pole through the pipe 10 embedded in the concrete foundation and laid with a slope to the outside. In the concrete foundation, niches 12 are provided, in which the gap 7 between the lower spherical cap 4 and the concrete foundation 2 is set by hydraulic cylinders. The lower spherical cap 4 is sandblasted on the convex surface after the welding and testing work and provided with a corrosion protection coating 5 . After setting the required gap, the dimensions of which result from the total weight of the filled ball container and the strength or elasticity properties of the plastic used (usually 30 mm in the main area and 60-70 mm in the edge area), the ball container 3 is further assembled by Execution of the first horizontal weld seam 14 . For support during assembly, supports 13 can now either be placed in the foundation niches 12 - support outside the foundation is also possible - or a mounting base 6 made of the plastic used for the bedding. In the latter case, a second pipe system 11 is required in the foundation to draw off the surface water entering the gap, which should consist of at least four pipes that are inclined uniformly over the circumference and outwards.

After the ball container has been completely assembled, the gap is filled either from the inside through the pipe 10 or through the pipe system 11 in the presence of the mounting base 6, or else by allowing it to run in freely from the outside. In general, a multi-component polyurethane system is used for this purpose, the flowability of which is such that it reliably fills all the spaces between the ball container and the concrete foundation. After reaching the final strength, the supports 13 can be removed, the bed 8 is ready. The reaction time depends to a certain extent on the mixing ratio of the components, but to a greater extent on the outside temperature. On very cold days, warm water should be used to heat the interior of the lower spherical cap.

In addition to polyurethane, other plastics can also be used. However, the flow behavior and the pressure resistance must be checked and the elastic behavior in the hardened state.  

Finally, the edge zone 9 can be sealed with a paste-like, hardenable plastic.

The following prerequisites are necessary to achieve perfect bedding necessary:

The concrete foundation must be well adapted to the spherical container curvature Surface should be smooth to prevent local build-up of surfaces to avoid water.

At the lowest point of the foundation, i.e. at the bottom pole, a pipe must which lead to the withdrawal of surface water through the concrete foundation allowed through.

The gap between the ball container and the concrete foundation must be during the Ball container assembly must be covered to prevent falling from hard Items such as To prevent welding electrodes, tools etc.

To protect against corrosion during assembly, a coat of paint must be applied to the outside Surface of the lower spherical cap are applied. This painting must be compatible with the bedding material and also serves as Adhesion promoter. It is best to use the same type of material, in the case a bedding material on a polyurethane system PU base.

During assembly, the ball container must either be on the concrete foundation be supported in such a way that it is necessary for later bedding Adjust gap or adjust after assembly or it a surface is made from the bedding material in the lower pole area asked, which must be such that the dead weight of the ball container can be safely accommodated. The latter leads to one Introduction of the liquid plastic in two staggered times Sections.  

The advantages achieved by the invention are that in one or a closed ball bed is produced in two work steps that is capable of, all through different levels, different internal pressures and external loads occurring Derive stresses across the surface into the concrete foundation. On elaborate additional measures, such as extensive corrosion protection of the lower Spherical cap or auxiliary bearing shell, can be dispensed with, so that economic benefits without sacrificing security. Advantage the invention is still applicable to spherical containers used for Prevention of stress corrosion cracking in certain bearing products the assembly must be stress relieved as the bedding material without difficulty or additional effort after annealing and starting cool the ball can be introduced.

Claims (1)

Foundation for the storage of spherical containers for holding liquids, liquefied gases or gases under pressure or in a depressurized state, consisting of a spherically preformed concrete foundation, a pipe system cast into it and an elastomeric bedding layer on which the spherical container rests, characterized in that the elastomeric bedding layer ( 8 ) consists of a liquid plastic that hardens after being introduced into a defined gap ( 7 ) between the concrete foundation ( 2 ) and ball container ( 3 ).