DE102010022802A1 - Soil bulk density improving method for e.g. subsoil sink redevelopment areas, involves directly utilizing ground water near ground sinks or water logging surfaces as working level of carrier unit for soil improvement - Google Patents

Abstract

The method involves utilizing a rope or a hydraulic excavator (1) that is operated as a carrier unit in an amphibious manner. The continuous or discontinuous lifting and lowering movements of a vibration equipment is freely selected and executed and digitally recorded, edited and processed. Depth/distance, time and soil operating pressure of vibration sources are measured and graphically represented in vibration set points. Ground water near ground sinks or water logging surfaces are directly utilized as a working level of the carrier unit for soil improvement.

Description

The invention relates to a method for improving the soil mechanical properties (eg storage density) of soils in the amphibious water - land transition area of waters, subsidence and subsoil regeneration areas.

In water - land - transitional areas of water bodies, subsurface sinks and subsoil regeneration areas there is often a geotechnically defined soil or subsoil due to physical forces. Thus, these areas are not available for safe use by inspection, driving, for excavation and earthworks or for building. They need to be edited to allow for reuse.

Typically, these water saturated and redistributed soils are excited by vibrations from high frequency internal vibrators from the construction industry. The processing usually takes place from the land side in with usual construction equipment or from the water side with usual construction equipment, which float on pontoon.

For the amphibious areas, wheeled or chain-driven implement carriers are currently being equipped with tubular lattice frames, which serve as carrier frameworks for roller systems, connecting hoses and high-frequency vibrators. For ground excitations, these high-frequency vibrators are hung on supply hoses and operated with vibration frequencies below 200 Hz. With these frequencies, the friction within the grain structure is reduced, so that the grains assume a denser storage under the action of gravity and the air entrainment decreases. The flexible hose suspension is necessary because the hoses are guided over rollers. Either to wind up the hoses or to change direction when lowering. Due to these roller guides, shaking depths are only possible up to a maximum of 10 m. The extraction from the soil takes place either continuously at a speed of about 1.2 m / min or discontinuously but only in about 1 m steps.

The penetration of these vibrators into the soil can only be done by the own weight of 0.005 to 0.020 Mg. In the usual solution, a centrifugal force of 0.7 tons is generated with the construction vibrator. These compressors only work with centrifugal forces at 0.70 Mg (manufacturer information). The area-related energy consumption is thus about 0.5 kW per 1 m ² . In riparian and shallow water areas, vegetation often occurs due to reeds and grasses. The dense root braids are a strong obstacle to the concrete vibrators, because they do not lose their strength in contrast to the ground due to the vibrations. The overcoming of the roots can not be supported by targeted loading of the concrete vibrator, because the elastic hoses are unsuitable for power transmission.

Strong root braids reduce the effect of this technical solution, the soil under the roots is not stimulated. The acquisition of the process data is not continuous within the process, starting with the lowering process and ending with the completion of the drawing process, but uses manual measurements of the work steps. In the existing solutions, the carrier device for process execution is not supported. The necessary for the performance representation depth detection is thus influenced by the floating device position and the suspension travel of the chassis.

The invention has for its object to provide a method for improving the soil mechanical properties, which the o. G. Remedies disadvantages. This is achieved by a method according to claim 1.

In the following the invention will be described with reference to the attached figures.

1 shows a sketch of a light Rütteldruckverdichtung.

2 shows in a perspective view and in a Traversendra view a vibrator unit for Aufsatzrüttler.

3 shows a report template for service entry.

As a carrier device amphibious working rope or hydraulic excavator are used. The devices are supported during the process on the soil to be improved. The solid connection of the carrier device with the vibration source for ground excitation via rigid mechanical elements and solid, uniaxial joints.

Depending on the depth of the water and the required depth of compaction in the soil, the vibration source will be deep vibrators ( 1 ), Vibrators for vibration ramming or pulling equipment or vibrating plates used. The weight is at least 1.5 mg. With this technical solution, a light vibrating pressure compression (LRV or LRDV) is carried out.

In 1 are an amphibious dredger 1 , a vibrator + lance (7.5 m) 10, a generator 20 and a water pump 30 for the media electricity and water as well as a pontoon 40 shown. 1 also shows a region to be compacted 50 and lying 60 ,

The vibrators are combined with vibrating beams / vibrating planks in different designs of the construction of the number and length of the vibrating bars ( 2 for example, shows a 6-fold construction).

2 shows a perspective view above and below a Traversendra view of a vibrating unit 70 for topping shaker. 2 shows in the upper perspective view a connection to the Aufsatzrüttler, a traverse and Rüttelbohlen (length variable as required). The vibrating unit 70 has the following dimensions:
a = 2.00 m
b = 1.00 m
c = 1.00 m
d = 1.00 m
e = 2.50 m
f = 2.00 m
g = 1.00 m
h = 1.00 m
k = 1.00 m

The continuous or discontinuous lifting and lowering movements are freely selectable and executable in the measuring paths. The continuous or discontinuous lifting and lowering movements of the vibration devices are digitally recorded, processed and processed during the process (such as in 3 ). This measures, among other things, the depth / travel, time and working pressure of the vibration sources and can be graphically displayed per vibration starting point. In conjunction with GPS, it is also possible to achieve a very precise territorial assignment and to map these digitized.

In addition to the weight of the vibrator, a pressure force on the vibration source by the excavator is possible. Compared to the existing solutions, a higher level of security is thus available for achieving the necessary target depth against resistance of plants and soil.

The rigid construction of the unit of deep vibrator (or vibrator with sole construction) and amphibious excavator in conjunction with the high energy input leads to a better ground excitation over the previous solutions.

The intended vibration sources generate maximum centrifugal forces up to 12 tons or 120 kN. This means that at least 8 kW per m ^{2 can be} entered into the soil. The required force can be set via the device control. The soil improvement process can be carried out more intensively and effectively. This will lead to a better slip resistance or usability.

The excavator moves under its own power to the intended location and then rests there with its hydraulic suction supports on the side pontoons. Due to the additional support of the carrier on the ground accurate depth measurement, regardless of the floating behavior of the device or its suspension suspension is possible. The position is checked via GPS.

LIST OF REFERENCE NUMBERS

1

amphibious excavator

10

Jogger + lance

20

generator

30

water pump

40

pontoon

50

area to be compacted

60

lying

70

vibrating unit

a, b, c, d, e

Dimensions

f, g, h, k

Dimensions

Claims (1)

Process for improving the soil mechanical properties (eg storage density) of soils in the amphibious water - land - transitional area of waters, sinks and subsoil regeneration areas, where: amphibious rope or hydraulic excavators are used as carrier equipment, during the process support the ground to be improved and thus accurately record the depths, the solid connection of the carrier device with the vibration source for ground excitation via rigid mechanical elements and solid, uniaxial joints occurs as a vibration source depending on water depth and required depth of compaction in the soil Tiefenrüttler, vibrators for Vibrationsramm- or pullers or vibratory plates are used, the weight is at least 1.5 Mg and a slight Rütteldruckverdichtung is performed, the vibrators with vibrating beams / Rüttelbohlen in different design design are combined by number and length of the oscillating rods, the continuous or discontinuous lifting and lowering movements in the measuring paths are freely selectable and executable, the continuous or discontinuous lifting and lowering movements of the vibration devices process accompanying digitally recorded, processed and processed, including depth / way , Time and Arbeitsandruck the vibration sources are measured and can be graphed per Rüttelansatzpunkt and groundwater near subsidence or for ground and basic equipment not accessible Vernässungsflächen without additional Dammaufschüttungen can be used directly as a working level of the carrier device for soil improvement.

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