Step 1/4 - System components
First of all, conical metal pipes must be inserted into concrete pillars (approx. 50% of the pillars of the storey for concreting), so as to simplify arrangement of the Alsipercha system. When the concrete reaches a load bearing capacity of 40 kg/cm3 (15% of its target load bearing capacity), the Alsipercha system may be installed. After introduction to the pipe, the operator hooks up to the self-braking device using the safety harness. The operator is ready to freely work at a radius of 6,5 m, describing an area of 125 sq m.
1. Boat hook pole (for changing the crane).
2. Crane (arm turns about by 360°, allowing free work).
3. Spigot (grabbed using the boat hook pole).
4. Sling (for movement using a hoisting crane).
5. Extraction device (with protective dome).
6. Red clamp (for extraction system band length adjustment).
1. Directly after the pillar concrete is poured, place in the centre of its crown the conical pipe, so that it protrudes by 5 cm. The pipe serves the mounting of the Alsipercha system.
Mode of placement of the fall arrest system in the conical pipe
2. The use of a levelling instrument shall ensure vertical arrangement of the pipe seat and will prevent it from moving. Thanks to the stay-in-place pipe, the pillar gains load bearing capacity.
Step 2/4 - System installation
1. Swing out the crane.
2. Secure the crane with its bolt.
3. Secure the sling and the protective extraction device.
Mode of installation of the sling. Used to lift the Alsipercha system to the pillar top and to remove it after the work requiring protection is concluded.
Mode of installation of the safety extraction device. Note the correct placement of shackles.
Unused mechanisms need to be stored in a clean condition in a dry place.
Place the red S. A. clamp at a distance of one metre from any carabiner, so that after the crane is installed in the pipe seat on the pillar, the end of the extraction device band is within reach of the worker's hand.
Step 3/4 - Placement and use of the Alsipercha system
1. Using a hoisting device, place the crane in the pipe seat on top of the pillar.
2. 36 hours after the pillar is poured, one may commence using the Alsipercha system to arrange battens, railings, partitions, etc.
Then, commence the formwork layout from one end of the storey, and work, protected, within a radius of 6,5 metres, equal to an area of 125 m2.
Step 4/4 - Changing the Alsipercha crane
The Alsipercha system allows an employee to hook up to the next crane before unhooking from the previous one, thus ensuring uninterrupted protection.
If the second Alsipercha crane is swivelled away so that the worker cannot reach it, the boat hook pole is used.
After all planks, protective railings, nets around edges and at openings are installed, and after battens are secured by their edges, and after they have been sprayed (in dry weather conditions), the crane may be removed.
In order for use of the Alsipercha system to be more effective, it is recommended to plan the working area, where the system is going to be used, ahead of time. Thanks to functions offered by the CAD application, one can plan the placement of Alsipercha cranes and foreseen the number required for optimum use on the processed surface ahead of time, thanks to which the surface formwork may be executed in a comfortable and reliable manner by multiple operators at the same time.
Working with the Alsipercha system
Work with the above described system can be divided into five main phases:
Phase 1: Inspection of system operation correctness
Before use, one needs to check:
The system needs to be inspected:
A register of the executed inspections also needs to be kept.
Phase 2: Planning - optimisation of placement and number of pipe seats, analysis of spots, where the tubes may be embedded.
|First, the stay-in-place pipes must be placed in the pillars, where the cranes shall be installed, and layout of the formwork should commence from the first one on.||Afterwards, begin layout of the formwork from one edge of the ceiling slab, working with the safety system, over a radius of 6,5 m, or on the area of approx. 125 sq m.|
Phase 3: Embedding the conical pipe
Insert the conical pipe, which will later serve to embed the system within it, to the inside of the structure, and when it is already located in the pillar, it is levelled. After the concrete solidifies, the Alsipercha system can be installed in it, and work will be possible with full safety.
The fall prevention system for the operator is embedded in a conical pipe, inserted earlier on into the pillar structure (and left to remain in the concrete). The operator hooks up to a retraction device forming a part of the system using a special safety harness.
Stage 4: Crane installation
In order for the crane to be assembled completely, one needs to:
After conclusion of the work within the radius of availability of the Alsipercha system, one can commence replacement of the hook for a different one. Before unhooking of the joint used up to this time, it is necessary to hook up to a further crane. Hence, the system allows the worker to hook up to a next crane before unhooking from the first one, thus ensuring safety without interruptions during the work.
A set of six Alsipercha systems is sufficient to cover 500 sq m2.