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35, RAMIREZ ARELLANO OFFICE BUILDING
2002-2002. MADRID

OFFICE BUILDING AND GARAGE IN Nº35, RAMÍREZ ARELLANO St.- MADRID


The building has 7 floors on the grade line (G+6) for office purposes and two floors under the grade line used as garage-parking, with a built surface of 21,989 m2 on the grade line and 7,069 under the grade line.


The plot where the building is located has a surface of 13,191 m2.


In the project of construction of the building were included the renovation works of a garage-parking located within the plot, with two floors under the grade line and a built surface of 3,585 m2, the adaptation of the roofing of such garage-parking in order to transform it into an outdoor parking and, finally, its connection with the garage-parking of the new building.

SITING


The construction plot was occupied by several buildings that the savings bank CAJA MADRID used as Computer Centre. The garage-parking mentioned above is the only structure that was kept from the original buildings.


BASIC CRITERIA


Planning of the building


Basically, what we have tried to achieve is to make the building flexible enough to house several companies in offices of different surfaces, with a minimum surface that we call "basic module". We have also tried to prepare the building in order to be used by one or several big companies.


Considering the funds available for the construction and exploitation of the building, the ideal solution was to construct a single building and reduce to a minimum its public areas. This building should also have the necessary features in order to be divided into segments, both on the floor level, with the aim of obtaining offices of different sizes, as well as vertically, in order to use these segments as independent buildings.


Visibility


The conditions of the plot, among them the fact of having facades opening onto opposite streets, allowed us to place the Ground Floor level 1.50 m above the average height of the line that links the midpoints of both facades.


The position, as well as the volume of the building planned, allow a perfect view from the surroundings and, more specifically, from Avenida de América St. and the M-30 ring road.


Accessibility


The access is located on the highest point of Ramírez Arellano St. and consists of a road that connects with the lobby of the Ground Floor of the building.


Such road, with entry and exit from Ramírez Arellano St., is used by pedestrians and vehicles to access the building and the subterranean parking.


The position of the building allows to recover the topography that existed prior to the current building structure. This is done by elevating the level of the plot and matching the level of the structures in the boundaries with that of the adjacent plot.


Taking into account that Ramírez Arellano is a tree-lined street, we planned to place trees on the surface parking, while leaving the non-asphalted plot covered with grass, small flowers and centres of bushes.


Use of the space under the grade line


Two floors have been executed under the grade line level. These are accessed through the main centre of the building via three groups of communications consisting of three lifts each, as well as via three stairs compartmentalised following the pattern of the stairs located above.


Installations


The three technical blocks of the top floors also pass through the two floors located under the grade line. Such blocks are connected with the areas corresponding to the installations rooms that are located perimetrally to the main centre.


Garage-Parking


Although the original plan envisaged a building with a single operational parking, due to the connection that exists between the different modules and to the fact that the building is located in a single plot, there are two areas with different characteristics: firstly, the one that includes the new building and, secondly, the existing parking.


a) New parking


In the corners of the new parking are located three emergency stairs that have been compartmentalised in accordance with the centres of the ground floor, with a lift in the main centre devoted exclusively for maintenance purposes.


The parking floors are connected with two one-way ramps. There is a total of 224 parking spaces.


The roads found inside the parking are one-way roads.


b) Existing parking


The connection between the two parking areas is done from the first basement of the new building to the second basement of the existing parking. This is possible because both basements are placed at the same level.


The floors of the existing parking, including the outdoor area, are linked by a two-way ramp. There is a total of 93 parking spaces.
Inside, we find one-way roads as in the new parking.


This parking has two centres of emergency stairs, one is located opposite to the parking and the other is located at a certain distance. Such stairs communicate the two basements all the way through to the outside exit.


AESTHETIC CRITERIA


From the aesthetic point of view, the building has been designed in the shape of an equilateral triangle, with facades slightly curved with regard to their central axes. Following the extension of such axes, we find the centre of the circumference that defines the facades.
In the horizontal plane, the modulation has been planned in multiples of 0.60 m and, in the vertical plane, the modules planned measure 0.95 m and 1.15 m.


The sequence of three modules of 0.95 m coincides in the vertical plane with the clear height of each of the floors (2.85 m). A module of 1.15 m coincides with the space necessary for the framing and for the location of the installations. This four modules together determine the total height of 4 m of the floors.


The closure of the facades will be done with a curtain wall, made up of sections and panels of varnished aluminium, as well as glass volumes with workable elements. This closure can be totally dismantled.


The composition of the glass volumes in the vision areas consists of a thermoacoustic CLIMALIT glazing made up of a COOL LITE PB 108 SECURIT glass of 10 mm in the exterior, and an air chamber of 12 mm and a STADIP SILENCE sheet in the interior, this latter is made up of a PLANITHERM glass of 4 mm and a PLANILUX glass of 4 mm.


FUNCTIONAL CRITERIA


From the fuctional point of view, the building has been divided in modules according to a basic reticle of 0.60 m x 0.60 m in the horizontal plane, which is used as base for the dimensional coordination of the different elements of the building.


The bay, otherwise centreline, between the external and internal facades measures around 14.40 m, which is equivalent to 24 modules of 0.60 m. This allows to lay out a central corridor with offices facing both facades, offices facing a single facade and areas of landscape offices. In all cases, we have kept natural light and, according to our experience, this can be achieved by placing bays of a similar width.


The solution planned consists of six basic modules that allow to rent office spaces that range from 444.84 m2 (a single module) to 2,669.04 m2 (six modules).


The six modules are organised around a central area in which are located three groups with three lifts each, three centres of stairs and three technical blocks of air-conditioning installations, ventilation, fume extractors, electricity, telephony and communications, installations control, plumbing, fire extinguising elements, etc.
In each of the technical blocks there will be a room to locate the electronic material for communications. In one of these blocks will be placed a cleaning room for the public areas.


In each of the external angles of the building are located three external emergency stairs with a lift on their centre for maintenance use. Next to these areas are located the toilets corresponding to each of the basic office modules.


En cada uno de los vértices exteriores del edificio se sitúan tres escaleras de emergencia (entoces esto spupone un total de nueve ¿es esto cierto?) que se desarrollan abiertas al exterior, con un ascensor en su parte central para utilización por el servicio de mantenimiento. Junto a estas zonas se sitúan las dotaciones de aseos correspondientes a cada uno de los módulos básicos de oficinas.


The central court gives light to the central group of lifts and it is used as an access to the offices. The other three courts give light to the offices as well as providing light and ventilation to the stairs.


TECHNICAL SPECIFICATIONS


FOUNDATION LAYING


All the supporting structures of the building transmit loads to a deep fundation, formed by groups of piles. These groups of piles are linked on the head by reinforced concrete pile caps on which the supporting structures rest directly.


The pile caps are tied up transversely by a bridging joist reinforcing the foundation in order to face possible horizontal movements or uneven settlements.


The perimetric walls of the basements rest upon a reinforced concrete base that is also used as bridging for the pile caps of the supporting structures located in the facade.


STRUCTURE


Description of the structure


The dimensions of the building on the ground plan make it necessary to divide it into three symmetrical sections through expansion joints. Each section includes an angle of the building and a half of the two adjacent sides.


The fact that the office floor is an open-plan one generates lights of almost 14 m and a framing structure different from that of the basement, where the lighting is moderate because of the existence of a greater number of supporting structures.


This means that the structural typology of the basements is different from that of the rest of the building.


The basements and the ground floor have been carried out using a perimetric wall of prefabricated reinforced concrete.


In the office floors, the framing consists of a folded PELSA 57/170 sheet of 1 mm thick, which is only used as formwork for a reinforced concrete slab of 12 cm thick. This framing rests upon laminated sections of A42-b steel in the areas with moderate lighting and upon open web girders in the areas with strong lighting.


FACADES


CURTAIN WALL


The facade has been solved by using a self-supporting fixed curtain wall with straight and polygonal plan, and with some glazed areas and some covered areas.


GLAZED AREAS


Vision areas


- Double glazing composed of exterior COOL-LITE glass 10 mm thick, BLUE PBN-108 or GREY SS-308, depending on the areas, air space chamber of 12 mm and Stadip SILENCE glass 8 mm thick, made up of a PLANITHERM glass and a PLANILUX glass.


Opaque areas


Glass tempering


- Glazing composed of tempered COOL-LITE glass 10 mm thick, BLUE PBN-108 or GREY SS-308, depending on the areas, and internal insulation panel made up of an external varnished aluminum sheet, insulation and a galvanised sheet 1 mm thick in the interior.


COVERED AREAS


With insulation


- Blind panel with supporting structure and auxiliary structure made up of galvanised sections.


The blind panel is composed of an aluminium sheet divided into various modules 3 mm thick and superficially treated with electrolytic coloured anodising, insulation and a galvanised sheet 1 mm thick in the interior.


Without insulation


-Blind panel with supporting structure and auxiliary structure in galvanised sections.


The blind panel is composed of an aluminium sheet divided into various modules 3 mm thick, superficially treated with electrolytic coloured anodising.

 

 

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