Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent
1991-11-13
1994-04-05
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Chemical
405258, 405303, 405269, E02D 520
Patent
active
RE0345768
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
(1) Field of the Invention
This invention relates to a method of, and apparatus for, the continuous casting of structural concrete walls.
(2) Prior Art
The speed of completion and cost of foundation works is directly related to the techniques used. In the highly developed areas such as the Gold Coast region of Australia, the techniques are often governed by the proximity of existing buildings to the property line. In addition, the techniques must allow for the low structural strength of many types of soil.
In the Gold Coast region, for example, continuous piling techniques are employed but these are generally slow, have an unattractive appearance, are prone to water leakage and are generally costly.
Continuous casting of structural walls has been proposed e.g. see U.S. Pat. No. 2,526,176 (Van Eyck). However, the method disclosed in that patent is extremely laborious and the use of the tracks for the excavating and casting machines precludes the casting of a wall closely adjacent e.g. within 10 mm. of an existing wall.
SUMMARY OF THE PRESENT INVENTION
It is an object of the present invention to provide a method of, and apparatus for, the continuous casting of structural walls.
It is a preferred object to provide a method, where the foundation trenches are immediately filled with concrete pumped under pressure to stabilize the surrounding soil.
It is a further preferred object to provide a method which eliminates the need for the underpinning and shoring of existing foundation walls closely adjacent a property line.
It is a still further preferred object to provide a method which requires little site preparation and yet enables the resultant walls to be dimensionally accurate, straight and level.
Other preferred objects of the present invention will become apparent from the following description.
In one aspect the present invention resides in a method for the continuous casting of a structural concrete wall including the steps of: immediately following the excavation; stabilize the sides of the trench; and
In a second aspect the present invention resides in apparatus for the continuous casting of a structural concrete wall including:
a work head mountable on a moving machine;
a continuous excavator on the work head adapted to dig a trench as the work head is advanced;
Formwork means immediately behind the excavation to support the sides of the trench as the work head is advanced; and
means to supply concrete under pressure to the trench to fill the trench and stabilize the soil and form the wall.
The work head is preferably mounted on the distal end of a slewing, buffing and/or extendable boom mounted on a wheeled- or tracked vehicle chassis. Preferably the work head is mounted for movement in all three axes relative to the boom to enable its correct orientation to be maintained as the vehicle is advanced over uneven terrain.
Preferably the excavator comprises a bucket or other continuous excavator and the soil may be conveyed away from the trench by any suitable conveying means.
Preferably the formwork is of substantially U-shape in plan, the legs of the formwork engaging and supporting the sides of the trench, the base of the formwork providing a shield between the excavator and the concrete.
Preferably the formwork includes an adjustable plate which forms the top of the wall.
Suitable hoses or pipes may convey the concrete under pressure from a remote concrete pump to the formwork and one or more vibrators may be provided in the formwork to compact the concrete.
Preferably automatic guidance means are provided on the work head to control the latter. The guidance means may include sensors which detect the beam from one or more lasers which provide a datum and a computer to assess the sensor outputs and control the work head to correct any deviations caused by uneven terrain.
BRIEF DESCRIPTION OF THE DRAWINGS
To enable the invention to be fully understood, a preferred embodiment will now be described with reference to the accompanying drawings, in which:
FIG. 1 is a schema
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S.W.R. (Australia) Pty., Limited
Taylor Dennis L.
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