Arrangement and process for the construction of a steel plant and related steel plant

Abstract

The invention relates to an arrangement, in particular a construction site, and a process for the construction of a steel plant for the production of long or flat products and a related steel plant which includes its subdivision into areas of greater (H) or lesser load (L), wherein the loads of the area of lesser load (L) (<1.5 tons/m 2 ) are placed on a raised plancher made of columns and slabs which have been prefabricated simultaneously with the construction of the building, which houses the production line of the steel plant, and the areas of greater load in a zone (PF; PC, C) which is preferably covered, adjacent to the construction zone of the building which includes a reinforcement production zone, a casting zone; and a curing zone. The post-tensioning technique of slabs is applied. The invention allows to speed up the construction of the steel plant.

1 . An arrangement for the construction of a steel plant for the production of long products, in particular bars, wire rods, rails and the like, or for flat products, in particular strips, sheets and the like, comprising:
 (a) an arrangement for the construction of a building suitable for containing machinery of a casting and rolling line of said steel plant, wherein the areas accommodating said machinery are divided into two types of areas (L, H) according to the load they are to support, namely into an area for loads<1.5 tons/m 2  (L) and an area for loads≥1.5 tons/m 2  (H);   (b) alongside said arrangement for the construction of said building a prefabrication area (PF; PC, C) of columns and slabs intended to make a raised plancher comprising:
 (b-1) a reinforcement construction zone for said columns and said slabs comprising bending machines (M, m) and shearing machines and materials for making reinforcement; 
 (b-2) a zone for casting said columns and said slabs comprising a plurality of formworks for making said columns and said slabs; 
 (b-3) a zone for storing and curing said columns and said slabs originating from said casting area; 
   wherein the areas for loads<1.5 tons/m 2  (L) within the construction zone of the building can be/are equipped with at least one foundation plate and/or plinths suitable for accommodating said columns made in the zones listed under point (b);   (c) at least one movement device for transporting the reinforcements, the columns or the slabs from one zone of point (b) to another;   (d) at least one device for transporting the columns and/or slabs from the zone of point (b-3) into the construction zone of the building.   
     
     
         2 . The arrangement according to  claim 1 , wherein (I) the reinforcement construction zone, together with the casting zone, is substantially parallel to the storage and curing zone which, in turn, is arranged substantially parallel to said building construction zone;
 or that   (II) the reinforcement construction zone, the casting zone and the storage and curing zone are aligned along a line which is arranged substantially parallel to said building construction zone.   
     
     
         3 . The arrangement according to  claim 1 , wherein said movement device is selected among a rail-mounted gantry crane and a mobile crane with a radius of action of 360°; and/or that said device for transporting the columns and slabs in the building construction zone is a self-propelled conveyor of the SPMT type. 
     
     
         4 . The arrangement according to  claim 3 , wherein for the transport of the slabs, a lattice frame, in particular made of steel beams, is installed on the platform of the self-propelled vehicle, on the upper part of which, during use, at least two slabs are placed so as to raise the height thereof with respect to the ground so as to be at a height that exceeds by at least 20 cm the height of the column heads placed in the plinths and/or on the at least one foundation plate. 
     
     
         5 . The arrangement according to  claim 1 , wherein said reinforcement construction zone comprises elements, in particular strands and respective sleeves, suitable for incorporation into said slabs for post-tensioning them. 
     
     
         6 . The arrangement according to  claim 1 , further comprising at least one covering structure, in particular a marquee, housing said zones identified under (b-1) to (b-3). 
     
     
         7 . A process for the construction of a steel plant for the production of long products, in particular bars, wire rods, rails and the like, or for flat products, in particular strips, sheets and the like, comprising the following steps:
 (i) providing an arrangement according to  claim 1 ;   (ii) at the same time as the construction of the building and the preparation of the areas (H) accommodating the parts of the steel plant with loads≥1.5 tons/m 2 , carrying out the following steps:
 (ii-1) pre-fabrication of a plurality of said columns; 
 (ii-2) in the zone according to (b-1) production of reinforcements for said slabs wherein said reinforcements comprise elements, in particular strands contained in sleeves, for post-tensioning the slabs, 
 (ii-3) in the zone according to (b-2) insertion of the reinforcements in the formworks for the slabs and casting of the slabs, 
 (ii-4) after a first determined time, removal of the slabs from the formwork and transfer of the slabs to the zone according to (b-3); 
 (ii-5) curing of the slabs in the zone according to (b-3) for a second predetermined time; 
   (iii) construction of said at least one foundation plate and/or said plinths in the area(s) (L) that are to support loads< of 1.5 tons/m 2 ;   (iv) transferring said prefabricated columns to the area of said at least one foundation slab and/or said plinths and positioning and anchoring said columns in said at least one foundation slab and/or in said plinths;   (v) transfer of said slabs cured in the area of the positioned and anchored columns and positioning of the slabs on the columns leaving spaces between the adjacent slabs;   (vi) casting in place of the spaces completing the construction of a raised plancher;   (vii) post-tensioning of said elements for post-tensioning.   
     
     
         8 . A steel plant for the production of long products, in particular bars, wire rods, rails and the like, or flat products, in particular strips, sheets and the like, comprising:
 (A) two types of areas (H, L) subdivided according to the greater or lesser load to be supported, and specifically subdivided according to the criterion of supporting a load≥ or <1.5 tons/m 2 , wherein in the greater load area (H) machines of the steel plant corresponding to a load≥1.5 tons/m 2  are placed and in the lesser load area (L) machines of the steel plant corresponding to a load<1.5 tons/m 2  are placed;   (B) in the lesser load area (L) a structure containing at least one foundation plate and/or a plurality of plinths, a plurality of prefabricated columns placed at predetermined distances on the at least one foundation plate and/or in the plinths and a plurality of prefabricated slabs positioned above said columns with spaces between adjacent slabs to form a plancher;   (C) machinery with a lower weight which is placed above said plancher,   wherein said slabs comprise tensioned elements.   
     
     
         9 . The plant according to  claim 8 , wherein said spaces are filled with a mortar casting. 
     
     
         10 . The plant according to  claim 8 , wherein said slabs have a size less than or equal to 6.5×6.5 m and/or a weight not greater than 50 tons. 
     
     
         11 . The arrangement according to  claim 3 , wherein said movement device is equipped with a platform that can be raised and lowered. 
     
     
         12 . The arrangement according to  claim 5 , wherein the elements are corrugated. 
     
     
         13 . The arrangement according to  claim 6 , wherein the at least one covering structure comprises a sliding awning. 
     
     
         14 . The process of  claim 7 , wherein the first determined time is about one day. 
     
     
         15 . The process of  claim 7 , wherein the second determined time is about four weeks. 
     
     
         16 . The process of  claim 7 , wherein the step of post-tensioning of said elements for post-tensioning is with the aid of hydraulic jacks. 
     
     
         17 . The process of  claim 7 , wherein after the step of (vii) further comprising the steps of:
 (viii) placement of the lower loads of the steel plant on said plancher; and   (ix) placement of the higher loads of the steel plant in the area(s) (H) for the higher loads.   
     
     
         18 . The steel plant of  claim 8 , wherein said tensioned elements comprise strands in relative sleeves filled with cement mortar.