1 MOBILE BASKET FOR CONSOLIDATION WORK ON WALLS
The present invention concerns a mobile basket for work on rocky walls, such as drilling, scaling, and the laying of netting, cables and structures for consolidation. In particular, the present invention concerns a new basket, with autonomous movement independent of supporting structures, that is provided with devices designed to improve its stability and adherence to the wall, and also to improve its dependability, work capacity and safety.
BACKGROUND OF THE INVENTION
Stretches of roads or railways or other installations below rocky walls can be endangered by the instability of the wall above. To prevent fragments and portions of a rocky wall from falling onto stretches of road or railway or on the installations below, the rocky wall is consolidated with netting and cables laid on the wall in order to contain it. Said netting and cables are fixed at intervals over the surface of the wall by means of active and/ or passive tie rods driven into the wall.
To correctly lay the netting and cables and to position the tie rods in the rocky wall, two methods are currently used. One method consists in the laying of ground supporting structures, such as tubular scaffolding, for the personnel and machinery. The other method makes use of mobile suspended baskets, which move vertically up and down the wall to be consolidated.
Said baskets consist mainly of a parallelepiped metal structure, suspended at the top of the wall to be consolidated by means of supporting cables; the basket is vertically translated up and down the rocky wall by means of cables operated by one or more hoisting elements. The metal structure of the basket is designed to accommodate the personnel assigned to consolidation of the wall, in addition to the machinery and tools, including the material necessary for laying and aflixing the netting and cables to the rocky wall and for the performance of the drilling operations.
The known suspended baskets are provided, on the side facing the rocky wall, with sliding blocks or guides designed both to facilitate translation of the basket up and down the rocky wall and to improve the stability of the basket on the rocky wall during the various consolidation operations. These baskets are also provided with a series of extendible pistons used both to facilitate movement and to stabilize the basket. The above baskets have a number of drawbacks that complicate operations for perfect execution of consolidation work and force the operators to perform several vertical translations up and down the wall and to adopt intricate and complicated stratagems, which at times put their own safety at risk.
In addition to these drawbacks, the current baskets expose the operators to harmful effects deriving from the work carried out, dust and noise, and to the risks inherent in the wall itself, collapse and landslides of portions at risk.
The main problem that the known baskets have to overcome is the continuous variation in configuration due to the irregularity of the rocky wall to be consolidated at the various points along the path of the basket.
Another drawback of the known baskets is the difliculty of reaching, even only occasionally and/or temporarily, areas immediately adjacent to the vertical path of the basket without translating the lifting unit installed at the top of the rocky wall. During consolidation of the wall, situations may occur
that cannot be predicted in advance and consequently it is not possible to program with absolute certainty the vertical bands covered by the path of the basket unless each path is amply overlapped with the adjacent ones.
A further drawback of the known baskets consists in the difliculty of the basket, during its vertical translation, of overcoming sudden changes in gradient such as parts jutting out, recesses or proj ections, ledges or niches.
BRIEF SUMMARY OF THE INVENTION
To remedy all the above drawbacks, a new mobile basket has been designed and produced for consolidation work on rocky walls.
One aim of the new mobile basket is to perform the operations on the rocky wall without the direct intervention of persons, or without the need for persons on board of the basket.
Another aim is to prevent harmful effects, dust and noise, and the risks inherent in the consolidation work for the site personnel.
Still another aim of the new mobile basket is to facilitate the overcoming of projections, ledges, recesses or other sudden variations in gradient of the rocky wall.
Yet another of the new mobile basket is to achieve the capability to translate laterally, in order to reach areas of the rocky wall to be consolidated that are immediately adjacent to the vertical band covered by the path of the basket, without having to translate the lifting unit installed at the top of the rocky wall.
A further aim of the new mobile basket is to maintain a substantially vertical configuration even on stretches of the rocky wall that are not vertical.
A still further aim of the new mobile basket is to permit the consolidation or application of anchors at an angle with respect to the face of the rocky wall.
A yet further aim of the new mobile basket is to permit several consolidations and/or applications of anchors along the same up-down path without having to move vertically each time to load the tools and/ or anchors.
These and other aims, direct and complementary, are achieved by the new mobile basket for consolidation work on rocky walls that includes a main frame, provided with spacers and lateral translation devices, and a secondary frame or cage with a drilling unit generally perpendicular and slantable with respect to the main frame.
The spacers and lateral translation devices, subsequently called legs, permit positioning and position adjustments of the new mobile basket in relation to the local configuration of the rocky wall. The angle of the secondary frame or cage with the drilling unit positioned on the main frame is adjusted by a worm screw jack.
The cage supports the drilling unit comprising the mast or drill, a magazine of drilling rods parallel to the mast, and a mechanical hand that takes the rod from the magazine and positions it on the mast or drill for application at the preselected point on the rocky wall.
The mechanical hand consists of a slide, sliding perpendicularly to the rods stored in the magazine, and is provided with three fingers, two of which are side by side and fixed, and the third of which can be rotated between the first two in order to retain each rod between said two fixed fingers and the third rotating finger.
The new mobile basket is suspended from cables, fixed on the upper part of the wall, wound and blocked by hoisting devices present on the upper front part of the main frame.