DE2836488A1 - Air supported hangar anchoring system - has pipes containing explosive set off after driving into ground - Google Patents

Abstract

The anchoring system is for air-supported hangars and flexible structures. It consists of pipes driven into the ground and closed at one end by flattening the tip to a point. A metered quantity of explosive is contained in each pipe, set off after driving home, so as to expand the pie in the ground. Before setting off, each pipe can be filled with water, sand etc. to act as protection or a tamping material. After setting off and expansion, concrete or other suitable hardening material can be delivered into the expanded portion.

Description

Anchoring of airborne halls and flexible constructions

An essential constructive component of air domes is the anchoring, which, in contrast to massive halls, not only and self-weight forces, but also from the stabilizing the hall Forces resulting from internal pressure. In addition, airborne halls are often implemented so that an expensive fixed anchorage that remains stationary in the ground is high Resulting in follow-up costs through constant replacement.

Well-known anchors are concrete foundations with expansion anchors or Dowels, which are very expensive because of the great buoyancy of the halls. you need In addition to concrete quantities of up to 1 cbm per running meter of hall circumference, depending on the span and height the hall still has strong iron reinforcement. Drop anchors made from angle iron are also used known, which are set as anchor pairs and in addition to relatively high manufacturing costs Difficult especially on stony ground or solid soil layers (e.g. local stone) and are time-consuming to assemble.

Another well-known form of anchoring is the rotating anchor, which is most common today to airborne halls, masts, flexible constructions to anchor etc. In addition to the relatively high cost, there is a disadvantage that the Stability depends on the respective soil conditions. The screwing in at no Stone-free soils often lead to difficulties, and the swivel anchor works with wrong ones Screw speeds than a drill, which significantly reduces the load capacity because the soil at the borehole is loosened.

Finally, anchors are known that are hammered vertically into the ground and are made of pipe. In one embodiment, these tubes are at the lower end are slotted and after being inserted by a pull rod that is operated with the help of a hydraulic spreader is pulled up, spread. Since only a conditional Spreading is possible, relatively long pipes must be used and the Pull-out strength is limited. In addition, the thread is the one used for spreading Threaded rod to be renewed frequently as the threaded rod is driven in of the pipe is used as a ramming rod and forwards the ramming hits to the anchor pipe.

A second known pipe anchor is made from square pipe, which laterally in the lower area contains horizontal slots through which after the Hammer in angle iron by hitting a spreader bar with a hammer to the side and horizontally be driven out.

This is repeated for each anchor part in the pipe, with no anchor part Can be wider than the pipe thickness, creating a relatively small width effect arises in the ground.

The pipe anchors mentioned here are characterized by an elaborate tip construction and pipe slitting work.

The invention avoids these disadvantages and makes it possible in particular inexpensive anchorages. The anchoring is done by a tube that is pulled in the direction of pull is hammered into the ground.

So that no earth can penetrate the pipe, it is at the lower end pressed together (e.g. by punching). It gets a tip at the same time, which significantly simplifies driving into the ground.

After driving in, the pipe is expanded by a precisely dosed explosive charge. The explosive cartridge is lowered into the tube and the tube is preferably lowered through water filled so that the pressure does not fizzle out upwards. The demolition will the lower end of the pipe spread up to five times its old diameter. *) or another suitable propellant After the blast, a solidifying substance, preferably concrete, filled into the pipe, the one at the end of the pipe by the blast resulting cavity fills and a contraction of the spread pipe end prevented under stress. This increases the contact surface against the ground.

The new anchoring has the following advantages: a) Easiest Pipe anchor production and easy assembly.

b) Very large expansion effect and therefore high pull-out strength.

c) Compaction of the soil at the anchorage and thus additional Increase in fitness.

d) Due to b) and c), relatively short pipe lengths are sufficient.

e) Following from a) to d) for all known types of anchoring particularly cheap production and quick assembly.

It is also useful before the pipe is hammered into the ground to attach a protective hood made of lead, for example, to the drill head, prevents deformation of the pipe head.

Claims (4)

Claims: method and device for anchoring airborne Halls and flexible constructions by means of driving into the ground in the direction of pull, tubes closed with a tip at the lower end, characterized in that the pipes with a metered explosive charge or another similar propellant be provided, which is ignited after driving the pipes into the ground and the end of the pipe spreads in the ground. 2. The method and device according to claim 1, characterized in that that the pipes provided with the explosive charge or the propellant before it is ignited with a liquid such as water, or bulk materials such as Sand to be filled. 3. The method and device according to claim 1 or 2, characterized in that that in the tubes after the ignition of the explosive charge or the propellant the spread pipe end as well as the one in its area due to the detonation Material that fills the cavity that forms in the ground and then solidifies, such as concrete, is introduced. 4. The method and device according to one of the preceding claims, characterized in that each before driving the pipes into the ground A protective hood made of lead, for example, is arranged on the pipe head will.