Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
Patent
1992-07-29
1993-10-19
Taylor, Dennis L.
Hydraulic and earth engineering
Underground passageway, e.g., tunnel
Boring
264 31, 264 32, 405140, 405146, 4051501, 425 59, E21D 1110
Patent
active
052539555
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a self-travelling support and slide formwork for producing a concrete lining. Such a support and slide formwork is normally employed selectively in continuous, discontinuous or charge-wise concreting operation.
In a known travelling support and slide formwork of this type (DE 30 43 312 A1), advancement takes place by the pressure of the concrete, which is introduced under pressure into the section of the annulus located behind the front formwork. The known slide formwork of this type is principly suited for a continuous, discontinuous or charge-wise concreting operation. However, even in continuous operation, especially for relatively thin concrete walls, the force of the concrete pumped into the region of the front formwork is often not sufficient to move the entire formwork forwards. For discontinuous or charge operation, where the forward movement of the formwork is interrupted when concreting is stopped, tension or compression forces must be provided, which are supported externally, i.e. outside of the formwork itself.
For charge operation, where the formworking and concreting take place sequentially, formworks are known consisting of elements which can be folded or lowered and which lie on a support construction drivable along the axis of the tunnel. This formwork has the disadvantage that the work associated with formworking and assembling is very time and cost intensive.
A further disadvantage is that the formwork can only be removed from the concrete when it has finally reached its load-carrying capacity, leading to delay times which are economically relevant.
The special conditions in gallery or tunnel construction or also shaft construction require a concrete formwork, which on the one hand can slide forward either continuously or discontinuously and, on the other hand, can be converted to a charge-wise concreting operation when required without effort, for example when special reinforcements are needed in particularly loaded sections of the structure or when sections are to be left open for recesses or cross channels, etc. The object of the present invention is to provide a self-travelling support and slide formwork, which in conjunction with a free selection among continuous, discontinuous or charge operation, enables the advancement of the formwork in all three types of operation under normal operation conditions, without the necessity of external counter-support points for tension or compression forces at any time, i.e. providing a formwork which travels by itself in all three types of operation.
In accordance with the present invention a self-travelling support and slide formwork is provided as defined in claim 1. Advantageous embodiments of the invention are given in the subclaims.
The present invention is described in the following by way of an example in conjunction with the drawings, which show:
FIG. 1 a schematic sectional view of a tunnel with circular cross-section, by which the entire profile is concreted in one working step;
FIG. 2 a sectional view of a tunnel with an arch-shaped cross-section and a floor, by which the floor has been preconcreted and the sidewalls and crown are concreted with the formwork of the present invention;
FIG. 3 a schematic longitudinal section of the slide formwork of FIG. 2 with one embodiment of a front formwork;
FIGS. 4a, b, c various slide movements of a slide formwork in accordance with the invention;
FIG. 5 a schematic representation of a formwork segment;
FIG. 6 a variation, by which the slide formwork has two parts in the form of a preadvancing, finishing formwork followed by a similar support formwork;
FIG. 7 a cross-sectional view of a formwork segment of the support formwork in FIG. 6 and;
FIG. 8 a schematic cross-sectional view of another embodiment of the hydraulic drive means of the formwork elements.
A formwork body 10 is provided in the embodiment shown in cross-section in FIG. 1 and also FIG. 2 of a self-travelling support and slide formwork which is subdivided into several formwork segment groups 12, 22 and 32 lyi
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Casella Anthony J.
Hespos Gerald E.
Taylor Dennis L.
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