DE1167777B - Concrete ring expansion for shafts - Google Patents

Description

Concrete ring lining for manholes The invention relates to the expansion of manholes with concrete or reinforced concrete rings, especially those of manholes, those under degradation effects or at all in loose or water-bearing rock layers stand so that the expansion results from deformations of the mountain body Is subject to stress.

Under such conditions, composite structures, which consist of a concrete cylinder and a steel jacket surrounding it, are used, in which relative sliding movements due to a bitumen backfilling of this composite body this composite body compared to the mountains, through which the as a result of deformations of the mountains occurring stresses, namely stretching and compression of are kept away from the expansion column.

In these known constructions, the concrete cylinder with the surrounding steel jacket anchored in such a way that there is a composite effect.

With shaft support structures designed according to this principle Although the elongations and compressions as a result of the rock deformations from Expansion kept away, but not as a result of relative horizontal Movements of the superimposed mountain layers resulting in the curvatures of the Shaft axis.

This affects when the manhole, as is usually the case in water Mountains or even floating mountain layers stands, particularly unfavorable for the necessary stability of the expansion.

Under such conditions it follows that the concrete body, the known to be able to absorb only very low tensile forces on the outer steel jacket adheres, which is pressed against the concrete by the water pressure. In case of Stresses on the expansion due to relative horizontal movements of the surrounding areas Mountain strata, d. H. in the sense of a curvature of the shaft axis, there is a risk the appearance of cracks in the concrete body because of its connection with that of elongation stressed steel jacket.

Even if the steel jacket is properly trained and sufficient The elasticity of the .steel remains watertight even in the event of curvatures, is ensured by these cracks in the concrete structure the stability of the expansion compared to the full water pressure acting on the waterproof outer jacket because of the reduction in The load-bearing capacity of the concrete is impaired as a result of the irregular cracks that arise in it. The invention creates a shaft extension that is just for such conditions is suitable, d. H. its stability even in the event of curvatures is fully preserved.

This is achieved according to the basic idea of the invention in that with the known formation of an inner concrete cylinder from a large number of superimposed 'rings, which are separated from each other by horizontal joints this concrete cylinder is enclosed by a watertight outer jacket, on the other hand, the individual rings that make up the concrete cylinder are separated from each other independently both in the direction of the shaft axis and among each other one-sided opening of the joints are movable tilting.

As a result of this arrangement, if the The shaft axis in the reinforced concrete rings does not have any vertical tensile stresses and thus also no damage to the same under the stresses caused by the steel outer jacket, on which the water pressure acts, to which reinforced concrete rings are transmitted. Therefor is of course a prerequisite that the outer jacket, opposite the reinforced concrete rings in this way can slide and tilt, made of a material of sufficient high elongation at break and sufficient strength, e.g. B. sheet steel of some, z. B. 5 mm thick with a high yield point.

The relative sliding possibility of the cylinder formed from the concrete rings compared to the sheet steel jacket, the sheet steel jacket is smooth and expediently - an additional bitumen coating of the same or a thin bitumen intermediate layer achieved.

The deforms under the effect of the loads Sheet steel jacket with corresponding consequences of the individual here more or less tilting compared to the shaft axis Concrete rings, where supporting the rings as buckling and breakage protection, on the under the external pressure loads standing outer jacket, d. H. the sheet steel jacket due to its elasticity can bend relative to the shaft axis without vertical expansion on the concrete rings are transmitted, which in turn absorb the horizontal compressive forces, with the steel jacket horizontal relative displacements of two successive concrete rings opposed to each other a high shear resistance.

The concrete rings are expediently made of with round steel in the form of outer and inner rings as well as stirrups reinforced concrete, with the cross section of the reinforcements of course, according to the rules of reinforced concrete, the expected loads is dimensioned accordingly.

The introduction of a shaft lining as described in principle above Art is through installation from the bottom up as well as floating in a drilling mud or in water possible, in both cases the sheet steel outer jacket first produced and then the reinforcement is introduced to finally the successive rings after introducing a possibly also as a sliding or climbing formwork to be concreted inside formwork.

The faces of the individual rings standing on top of one another are either separated from one another by a coat of paint or an insert in such a way that the individual Rings do not adhere to each other, but their independence is preserved.

The outer jacket can be made up of individual shots in a known manner be made with welding in place. Is particularly advantageous according to a further feature of the invention, its formation from an endless steel belt - according to the method used in the manufacture of spiral pipes - under spiral winding the same and welding the joints. The space between the outer shell and the mountain can be in a known manner with concrete, sand or bitumen be backfilled.

From the above explanations of the essence of the invention results that the proposal on which it is based has nothing to do with a familiar monolithic one Shaft expansion has to do with the classic expansion from cast iron and segment rings is replaced by a closed concrete pipe. The well-known expansion has none Single segments. that would be able to follow the movements of the mountains.

Exemplary embodiments of the invention are shown in the drawings.

A b b. 1 shows a vertical section, partly in perspective Section of the new expansion in the initial state; A b b. 2 shows the same expansion, namely in relation to the shaft axis through the effect of corresponding stresses curved state.

A b b. 3 illustrates the bottom of the extension as it is floating in is required in a well; A b b. 4 and 5 show the installation of the extension on the foundation and the watertight connection of the jacket to the foundation, if the expansion is floated or set up in a freezer shaft; A b b. 6th shows the possibility of the sheet steel jacket from an endless band from each other to form spiral windings welded along their joint line.

In A b b. 1, a1, a2, a3 ... - etc. denote the stacked concrete rings, forming the inner concrete cylinder, which are independent, ie both relative to one another and to the sheet steel jacket b surrounding the stack of concrete rings. -A b b. 2 shows the situation. which arise when a curvature occurs relative to the shaft axis as a result of corresponding rock movements, while the individual concrete rings within the sheet steel jacket with one-sided opening of the z. B. tilt with a coat of paint or an intermediate layer filled joint and at the same time relative to the sheet steel jacket, allows z. B. by a bitumen paint, move in the direction of the shaft axis.

A b b. 3 shows, understandably without further explanation, how the sheet steel jacket is provided with a dome-shaped steel floor, which is filled with concrete, if the expansion is to be floated into a borehole.

In A b b. 4 and 5 is the waterproof connection of the jacket to the Foundation shown when the expansion will be placed in a freezer shaft target.

A b b. 4. shows the formation of the ground and foundation when the expansion Swim in: A b b. 5 provides the watertight connection for both cases represents, in the case that the expansion was floated, the one shown in dashed lines Part of the floor after the expansion and the temporary sealing of the Annular space between expansion and rock was removed when penetrating the soil. For sealing, a sheet metal k is watertight on the foundation and expediently on placed a small height on the inside of the shaft wall.

The bottom ring plate connected to the jacket in a watertight manner or in the Case of the expansion of the expansion after it has been put on and pierced The bottom cut steel floor unil the foundation plate k are on the inside edge 1 connected to each other in a watertight manner, so that the inflow of water and / or bitumen from the areas outside the tight jacket in the event of any partial lifting the support column from the foundation is impossible.

Apart from the advantages described above, the Expansion has the further advantage of an extraordinary economy because of the relatively economical use of steel.

Claims (6)

Claims: 1. From mutually independent superimposed Concrete or reinforced concrete rings existing expansion for manholes, especially those which stand in water-bearing mountains and / or the action of mountain movements are exposed, in that the individual becomes one Cylinder body composed concrete rings in a cylinder body enclosing waterproof outer jacket independently of each other both in the direction of the shaft axis as The joints can also be tilted under each other by opening the joints on one side are. 2. Expansion according to claim 1, characterized in that between the concrete ring body and the outer shell has the relative sliding movement of the rings with respect to the outer shell relieving relatively thin intermediate layer, e.g. B. bitumen introduced is. 3. Expansion according to claim 1 and 2, characterized in that the space between the outer jacket and the rock is filled with concrete or sand. 4. Expansion according to claim 1 and 2, characterized in that in per se known Way the space between the outer jacket and the mountain range by a plastic Mass is filled in such a way that the outer jacket as such against the mountains can slide. 5. Expansion according to claim 1 to 4, characterized in that the outer jacket from one unwound from one according to the principle of spiral pipes by welding Sheet steel band formed spirals with each other is made up of bodies. 6. Expansion according to claim 1 to 5, characterized in that in the case of its installation in a Freezer shaft, which is then placed on an im. The foundation made in the shaft rests, a sheet metal ring k is placed on this foundation in a watertight manner on the inner edge L after the extension has been put in place with a watertight attached to the jacket The bottom ring plate is connected in a watertight manner. Publications considered: German U.S. Patent No. 244,876.