EP0121031B1

EP0121031B1 - Modular elements building structure

Info

Publication number: EP0121031B1
Application number: EP83830260A
Authority: EP
Inventors: Luigi Granieri
Original assignee: Individual
Current assignee: Individual
Priority date: 1983-03-24
Filing date: 1983-12-07
Publication date: 1986-12-30
Also published as: IN162303B; ATE24563T1; PT78300A; IT8347988A0; IT1170346B; ES529618A0; EP0121031A1; DE3368709D1; EG17312A; ES8502508A1; PT78300B

Abstract

A single storied or multistoried building structure is disclosed which is based on a concrete foundation slab and is provided with perimetrical and interior walls made of prefabricated reinforced concrete panels (5) at the top sides of which metal channel profiles (19) are embedded into the pannel concrete and which are fastened to one another by means of bolts (22) which connect respective upward extensions of metal plates (21) which are fitted into said metal channels (19) to engage a pair of projections extending from the channel sides; said panels (5) being anchored to the foundation slab by means of vertical tie rods (11) hooked at their lower end onto inverted T structural shapes (4) fastened on the foundation slab and connected at their upper ends by means of a nut (18) to said metal plates by which the panels are connected to one another. Such tie rods (11) extend along vertical ducts (12) which are defined, between two panels approached to one another, by channellike metal profiles (9) which are embedded into the vertical edges of each panel (5). In the case of a multistoried building a floor is interposed between two successive stories which floor comprises a corrugated metal sheet (30) with trapezoidal cross-section of the corrugations the edge of the sheet being laid to rest on top of the walls of the room to be covered by the floor; which sheet (30) functions as a form casting the concrete mortar and cooperates therewith as a reinforcement.

Description

The object of this invention is a building structure made of prefabricated elements according to the features of the precharacterising part of claim 1.
Building structures made of modular prefabricated elements are known. However, they suffer sometimes from various drawbacks such as the following:

a. the basic elements are encumbrant and difficult to transport;
b. the number of the basic structural elements and of the accessory elements for assembling them is excessive;
c. welding on the spot of metal elements is required which implies a low reliability of the weldings and a troublesome work.

FR-A-1 565 754 discloses a building wall made of a number of wall panels which are aligned to form a wall. Such panels are provided with a lower and upper structural shapes which are connected together by means of tie rods which extend each along a vertical groove provided at about the vertical mid plane of the wall. Each of said tie rods is adapted but not bound to the panel mass along said groove.
USA Patent.2.924.962 to Nettle describes a solid concrete wall construction comprising a plurality of precast panels approached to one another which have each a pair of vertical terminal grooves and a number of vertical parallel vertical ducts; said grooves pertaining to a pair of adjoining panels being empty at their insides except for short keys whereby they are coupled together in cooperation with outer locking lugs.
The above drawbacks are overcome in the building structure of the present invention in as much as a low number of modular elements (panels) and of assembling elements is used. No welding work is to be made on the spot.
According to claim 1 more specifically each of the panels is provided along its upper edge with a horizontal channellike metal top profile open upwards and along its vertical sides with a channellike metal side profile such that a duct filled with concrete is defined between the vertical side profiles of a pair of adjoining panels as assembled in the building; said metal profiles both top horizontal and side vertical being unbedded in the concrete panel when this is cast into its form.
According to the present invention a normal type panel is provided to be used for the perimetral walls of the building- the building corners being excluded- and for the interior walls (the structure for bonding or grafting the latter to the peripheral walls being excluded) and two types of panels slightly different from the normal panel, of which one type is to be used for the building corners and the other for bonding or grafting an interior wall with a peripheral wall. Special type panels are also provided in which apertures are provided for applying doors and windows thereto.
On assembling the panels, these are mounted in approached relation to one another and connected each to the adjoining panels by mechanical means which engage the upper channellike profiles of the panels. The panels are anchored to the reinforced concrete slab of the building by means of vertical tie rods the lower ends of which are hooked onto said slab by means of cramps buried into the slab concrete.
This invention will be better understood from the following description and attached drawings which illustrate two preferred embodiments thereof given by way of examples. In the drawings:

Fig. 1 shows a horizontal cross-section along line I-I of fig. 2 of a pair of normal panels approached to one another with the vertical tie rod which connects them to the building foundation slab;
Fig. 2 shows a fragmentary vertical cross-section along line II-II of fig. 1 of a pair of normal panels approached to one another and the related means for anchoring them to the building foundation slab;
Fig. 3 shows a fragmentary horizontal cross-section of a lightened panel according to the invention;
Fig. 4 shows a horizontal cross-section of a pair of adjoining lightened panels according to the invention;
Fig. 5 shows a fragmentary vertical cross-section along line V-V of fig. 6 of the upper portion of a normal panel with the attachments for connecting it to an adjacent panel;
Fig. 5A shows a vertical fragmentary cross-section along line VA-VA of fig. 6A of the upper part of a normal panel with the attachments for connecting it to an adjoining panel in a second embodiment of the invention;
Fig. 6 is a cross-section along line VI-VI of fig. 5;
Fig. 6A is a cross-section along line VIA-VIA of fig. 5A;
Fig. 7A is a cross-section of a metal profile of which each panel is equipped along its vertical sides according to the invention;
Fig. 7B is a schematic perspective view of the metal profile of fig. 7A;
Fig. 7C is a schematic perspective view of one of the upper corners of a normal panel of this invention;
Fig. 8 is a perspective view of the terminal portion of the metal profile with which the upper edge of each panel is equipped;
Fig. 8A is a plan view of a terminal portion of the channellike profile of which the upper edge of each panel is provided.
Fig. 88 is a cross-section along line VIII-VIII of fig. 8A;
Fig. 8C is a cross-section along line VIII'-VIII' of fig. 8A of the metal profile with which the upper edge of each panel is equipped;
Fig. 9 is a plan view of the joint of two normal panels according to a first embodiment of the invention;
Fig. 9A is a plan view of the joint of two normal panels according to a second embodiment of the invention;
Fig. 10 is a top view of the joint of a normal panel with a corner panel according to a first embodiment of the invention;
Fig. 10a is a top view of the joint of a normal panel with a corner panel according to a second embodiment of the invention;
Fig. 11 is a top view of the joint of a normal panel pertaining to an interior wall with two panels adapted for grafting said wall to a peripheral wall according to a first embodiment of the invention;
Fig. 11A is a top view of the joint of a normal panel pertaining to an interior wall with two panels adapted for grafting said wall to a peripheral wall according to a second embodiment of the invention;
Fig. 12A is a cross-section along line XII-XII of fig. 12C of a long type angle plate for connection of normal panels;
Fig. 12B is a cross-section along line XII'-XII' of fig. 12C;
Fig. 12C is a cross-section along line XII"-XII" of fig. 12A;
Fig. 13A is a cross-section along line XIII-XIII of fig. 13c of a short type angle plate for normal panels connection;
Fig. 13B is a cross-section along line XIII'-XIII' of fig. 13C;
Fig. 13C is a cross-section along line XIII"-XIII" of fig. 13A;
Fig. 14A is a cross-section along line XIV-XIV of fig. 14C;
Fig. 14B is a cross-section along line XIV'-XIV' of fig. 14C;
Fig. 14C is a cross-section along line XIV"-XIV" of fig. 14A;
Fig. 15A is a cross-section along line XV-XV of fig. 15C of an angle plate for connecting a normal panel of an interior wall to each of a pair of panels adapted for grafting an interior wall onto a peripheral wall;
Fig. 15B is a cross-section along line XV'-XV' of fig. 15C;
Fig. 15C is a cross-section along line XV"-XV" of fig. 15A;
Fig. 16 is a fragmentary vertical cross-section along the median plane of a wall of the floor included between two subsequent stories of a building according to the invention;
Fig. 17 is a fragmentary vertical cross-section, perpendicular to a building wall, of a floor included between two successive stories of a building according to the invention.

With reference to the drawings the building structure of this invention comprises as its basic structural element a rectangular prefabricated panel 5 made of reinforced concrete wherein a reinforcement is embedded which may comprise two parallel grids formed by steel rods 10 perpendicular to one another and to the panel sides; a channellike metal profile 19 built in along the side of each panel which is the top side of the panel when this is installed; a channellike metal profile 9 is built in along each of the panel sides which are the vertical sides when the panel is installed, which profile 9 extends from the lower end of the panel up to the level of the bottom of the channel 19; the above channels 19, 9 are embedded into the concrete mass when this is cast into the panel form.
The horizontal channel 19 is shown in perspective in fig. 8 and in top view and longitudinal cross-section in figs. 8A and 8B. It is made of an upward open C iron sheet profile. According to an important aspect of the invention channel 19 near each of its ends is provided with two shoulders 27 projecting from the opposite vertical sides thereof which shoulders, as specified hereinafter, serve for connecting together two adjoining panels.
Vertical channel 9 is an iron sheet profile shown in perspective in Fig. 7B and in cross-section in fig. 7A. It extends downwards to reach the lower edge of the panel and upwards to reach the level of the bottom of channel 19. Channel 9, in cross-section is formed by a rectangle lacking one of its longer sides while each of the shorter sides extend perpendicularly thereto for a length 9' slightly shorter than said shorter side and for a second length 9" equal to about the length of said shorter side and for a third length 9'" equal to about one third of the length 9" at an angle of about 120 deg, with respect thereto.
At regular distances along each of the two corners between lengths 9' and 9" of the profile cross-section a series of openings 15 are provided for better fastening the profile to the concrete.
Along the side of the profile which in cross-section is the longer side of the rectangle, a series of undulating tongues 14 are formed by punching intended for being buried into the concrete mass of the panel for restraining the profile thereto. Along the lower side of panel 5 a groove 7 is provided into which the upright leg of an inverted T iron shape 4 is to be received as explained hereinafter.
An indentation 7' will also be provided at the lower end of the vertical channellike profile 9 symmetrical with respect to the symmetry plane thereof for receiving the inverted T shape 4.
Panel 5 as described serves for making the walls of the building structure according to the invention and will be called hereinafter, "normal" panel.
When a pair of said panels are installed side by side, a wellhole or shaft is formed between each pair of panels along their adjoining vertical sides which shaft is defined by the respective channellike profiles 9 of the panels. Additional panels slightly different from the normal one are provided for making the building corners and for bonding or grafting an interior wall onto a peripherical wall. They will be named hereinafter "corner panel" and "T graft panel". One of the vertical edges of the corner panel 23 (fig. 10) is the same as the sides of a normal panel 5 while at the other edge, as shown in Fig. 10, the vertical profile 9 is not, as in panel 5, symmetrical to the median plane of the panel but lies on a plane perpendicular to the panel along the face border thereof to be joined to the edge of a normal panel 5 pertaining to the peripheral wall of the building at right angles with the wall which the corner panel 23 belongs. The position of the metal channel 19 of the corner panel will be such that the outer surface of panel 5 will come flush to the outer surface of the edge of panel 23. When panels 5 and 23 are brought to mate, a square prismatic vertical duct 12 is defined by the respective profiles the same as with the case of a pair of normal panels.
The T graft panel 25 (fig. 11) is nearly similar to a normal panel 5 except for the fact that a very short end section is lacking of one of the panel upward projections between which the channel 19 is received. The void left by said lacking section added to a similar void of the adjoining panel will provide enough space for fitting thereinto a plate 21 for connecting the interior wall to the peripheral wall.
Interior wall E is grafted to the peripheral wall F at the joining of two panels of the latter which panels must be justly of the T graft panel type.
Any of the three panels as above may be lightened, while preserving its dimensions, by replacing a part of the concrete thickness with a lighter material such as synthetic foam and the like.
Special panels not described herein are made with apertures for installing windows and doors in the building walls. Such panels must anyway be provided at their upper edges with a means for connecting them to channels 19 of the adjoining panels and with profiles adapted for mating the profiles 9 of the adjoining panels and forming therewith the ducts through which tie rods 11 are to be led.
The system will now be described for anchoring the panels of the invention to the foundation slab 1 of the building. Into foundation slab 1, possibly provided with a grid of reinforcing rods 10, an anchoring clamp is embedded which comprises two symmetrical jaws coupled to one another by bolts 3 (fig. 2), the clamp overall dimensions being such that it can be received into duct 12. At the upper level of the foundation slab an inverted T structural shape 4 is laid down of which the flanges are encompassed by the two jaws of the clamp. A series of vertically elongated slots 6 are provided through the leg of shape 4 at a distance from one another equal to the horizontal size of the panel (when installed) but slightly displaced with respect to the mating plane of two adjoining panels vertical sides. Into each slot 6 the hooked lower end of vertical tie rod 11 is inserted which rod is thus displaced as the related slot from the mating plane of the two adjoining panels whereby the rod extends vertically within one half of the duct 12 to reach near the level of the upper edge of the panel, the upper end of the rod being threaded. At the upper edge of the panels the profiles 19 of two adjoining panels and the tie rod which extends upwards from duct 12 formed by the two vertical profiles 9 of said panels are jointed together. The jointing, both in the case of two normal panels and in the case of corner panels and graft panels, is made by means of angled plates of which the horizontal arms engage the shoulders 27 projecting from the vertical inner sides of the profiles 19 of the respective panels to be joined, and the vertical arms are coupled by means of bolts 22 to one another. The vertical tie rods extend through a hole of the horizontal arm of one of the plates and is fastened thereon by means of a nut 18 tightened on the threaded end section of tie rod 11.
In the case of two normal panels (fig. 6) a long angle plate 21 (fig. 12) is used which will be fitted into the profile 19 of that panel whose shoulders are nearer to tie rod 11 and a short angle plate (fig. 13C) will be fitted into the profile of the other panel. When the two panels are approached to one another the vertical arms 21' and 20' of the two plates will mate each other and be tightened together by means of bolt 22. This is feasible due to offset of tie rod 11 in as much as bolt 22 and nut 18 do not interfere with one another. When a normal panel 5 is to be joined to a corner panel 23 (fig. 10) a long plate similar to the preceding case is used for the normal panel (within whose periphery as shown in fig. 10 the tie rod 11 included) while an angle plate 24 of the type illustrated of in fig. 14C is used for the corner panel. The vertical arm of plate 24 extends upwards from one side of the plate and when panels 5 and 23 are brought to mate together, said arm mates the vertical arm of angle plate 21. Angle plates 21 and 24 are connected by means of a bolt 22 and plate 21 is connected to the rod 11 by of a nut 18. When a normal panel pertaining to an interior wall is to be joined to a pair of T graft panels 25 pertaining to a peripheral wall, a long angle plate 21 will be used for the normal panel and a short angle plate 20 for one of the graft panels 25 while for the other graft panel an angle plate 26 will be used having the same length as plates 21 and 24 but being provided with a vertical arm 26" at one of its sides in addition to a vertical arm 26' at one of its ends. Plates 21,20,24,26 will be connected together and to tie rod 11 as in the two preceding cases.
All the above angle plates are provided at each side of their horizontal arm with a notch 27' symmetrical to one another adapted for engaging the reciprocally facing shoulders 27 projecting from the two vertical walls of channel 19.
Prior to applying the above angle plates, duct 12 will be filled with cement mortar. Prior to casting the mortar, any pipes or cables can be included in duct 12 the inlets and outlets of which can be made to extend from said duct through holes of which the duct walls are provided.
In a second embodiment of the invention the system is changed for joining the upper channellike profiles 19 of two adjoining panels to one another.
According to said embodiment each of the upper profiles 19 of a normal panel, corner panel and graft panel which in this embodiment will be respectively identified by reference numbers 5', 23', 25' is not provided near each of its ends with shoulders 27 reciprocally projecting from the inner sides of the channel for engaging the notches 27' of the appropriate angle plate. In this embodiment all the connecting plates are flat and are fastened on bored and threaded blocks 38 which are welded on the lower surface of the bottom wall of channel 19 and thus buried into the panel concrete, when this is cast into the panel form. Said bottom wall is drilled at the location of each block for letting a head bolt 40 pass through and be screwed into block 38.
The connecting plates in the three cases of continuous wall, building corner and interior wall grafted to a peripheral wall are shown in plan view in figs. 9A, 10A, 11A respectively and are respectively identified by reference numbers 35, 37 and 39. Plate 35 is shown in cross-section by figs. 5A and 6A. it has the shape of a rectangle of which one side is slightly shorter than the width of the bottom wall of profile 19. As shown in fig. 9A, plate 35 is disposed symmetrical with respect to the mating plane of the two panels to be joined together and has three holes along the centerline of the plate one of which, coincident with tie rod 11, is round and the other two 36, 36', coincident each with a block 38, are elongated in the direction of said centerline.
Plate 37, as shown in fig. 10A, has an "L" shape in plan view with a longer arm to be fitted into the upper channel 9 of a normal panel 5' and a shorter arm to be fitted into the upper channel 19 of a corner panel 23'. Plate 37 is provided with two holes along the centerline of the longer arm, one of which is round and coincident with tie rod 11 and another 36 is elongated and coincident with a block 38 welded underneath of channel 19 pertaining to panel 5', the other hole 36' being elongated and coincident with a block 38 welded under the profile 19 pertaining panel 23'.
Plate 39 as shown in fig. 11A has a T shape in plan view with two equal arms shorter than the third arm perpendicular thereto. The two shorter arms are to be fitted into respective channels 19 of two adjoining graft panels 25' of a peripheral wall and the longer arm is to be fitted into the upper channel of a normal panel 5' of an interior wall. Along the common centerline of the shorter arms a round hole 36" is provided coincident with tie rod 11 and two elongated holes 36, 36' are provided coincident with the respective blocks 38 of the two graft panels 25'.
In all the three cases above described the connecting plates 35, 37, 39 are tightened by bolts screwed onto the respective blocks 38 and by a nut tightened on the respective rod 11.
When the building is a multistoried building according to an important aspect of the invention a floor (figs 16 and 17) is built on the upper edges of the ground story panels.
To this purpose longer tie rods 11' are to be used for building the ground story instead of tie rods 11 as used for a single-storied building. Tie rod 11' in fact must be long enough for surpassing the floor thickness in addition to the height of the ground story panels. The upper section of tie rod 11' will be threaded for its length passing through the floor and, in addition, for a short length from the under surface of the floor downwards.
The floor will be made by laying a corrugated sheet 30-preferably with corrugations of trapezoidal cross-section-from one to the other of two parallel walls of the room to be covered by the floor; in case of a rectangular room the sheet corrugations will run parallel to the shorter sides of the rectangle. The peripheral edges of sheet 30 will extend to rest only on the upwardly extending inner projections along the upper edges of the wall panels so that the channellike profiles 19 of the panels will be left uncovered. Corrugated sheet 30 as set forth hereinafter, is intended for functioning as a form for casting the concrete mass of the floor and for cooperating therewith.
The downward facing furrows of the sheet will be closed at their ends by trapezoidal plates welded along their edges to the furrow profile for preventing any cement mortar from falling down when casting it over the corrugated sheet.
Together with the corrugated sheet a reinforcement of the floor slab 30' will be laid which comprises an upper array of rods 16 and a lower array of rods 29 the rods of the upper array being interlaced with rods running along the periphery of the floor slab 30' between the outer and inner planes of the walls; the rods of the lower array having their ends bent at square angles and fitted into the profiles 19 of the wall panels. Subsequently to applying a horizontal planking on the outer surfaces of the walls over an area corresponding to the thickness of the floor to be built to function as a formwork, a mass of concrete will be cast over the corrugated sheet and into the profiles 19. Subsequent to the casting of the concrete mass and to the setting thereof an inverted T shape rail 31 will be laid on the top surface of the floor slab 30' which rail lies on the vertical plane of shape 4 on which the lower ends of tie rod 11' are hooked. At the position where each tie rod 11 energes from slab 30' the upright leg of rail 31 is cut away for a short length to provide a space for a hole 31' through the flange of rail 31 and for inserting a threaded sleeve 32 flanged at its lower end surrounding hole 31'. Tie rod 11, after passing through hole 31' extends upwards for a short threaded length which engages the inner threading of sleeve 32 for one half of the length thereof, the remaining length of the sleeve inner threading being engaged by the threaded lower end of an extension 33 of tie rod 11. Extension 33 has a length equal to the height of a building story.
The building roofing is not described herein because is it not within the scope of the invention. It can be of any known type such a platform roof, a pent roof, a gable roof and so on. For anchoring the roof to the building tie rods 11, 33 could be used the upper ends of which, in this case, should be suitably extended and provided with means for attaching them to the roof frame.

Claims

1. A building structure with peripheral and interior walls (23, 5) based on a concrete slab foundation (1) said walls being made up of reinforced concrete precast rectangular panels approached to one another, all having the same dimensions, their heights being equal to the distance between the floor and the ceiling of a story of the building, a tie rod (11) being led to extend vertically between a pair of said panels (23, 5) approached to one another which tie rod (11) is hooked at its lower end to the upright leg of an inverted T metal shape (4) anchored to the building slab and extending under and along the building walls; said tie rod (11) being threaded at its upper end for connecting it by means of a nut (18) to a means by which the tops of a pair of adjoining panels are fastened to one another; said panel being also provided along its lower edge with a furrow (7) in which said leg of the inverted T metal shape is received;

characterized by the fact that each of said panels (5) is provided along its upper edge with a horizontal channellike metal top profile (19) open upwards and along its vertical sides with a channellike metal side profile (9) such that a duct (12) filled with concrete is defined between the vertical side profiles of a pair of adjoining panels as assembled in the building; said metal profiles both top horizontal and side vertical being embedded in the concrete panel when this is cast into its form.

2. A building structure as claimed in claim 1, characterized by the fact that said channellike metal top profile (19) open upwards is provided near each of its ends with a pair of shoulders (27) projecting from each vertical inner side of the channel at a short distance from the channel ends and that in said channel a plate means (21, 20, 24, 26) is fitted which has at least a flat arm at contact with the channel bottom, two notches (27') being provided in said flat arm which engage said pair of shoulders; said connecting means being adapted for joining together at least two adjoining panels and being also adapted for fastening the said connecting means to said tie rod (11).

3. A building structure as claimed in claim 2, characterized by the fact that said plate means for connecting a first panel to at least another panel comprises a flat plate for each of the panels to be joined together which plate is provided with a pair of notches adapted for engaging said pair of shoulders said plate being also provided with at least one vertical arm (2T, 20', 24', 26') adapted for being bolted to a similar arm of a similar plate of another of said panels to be joined to the first one; one of the plates of the panels to be joined together being provided with a hole through which said tie rod is led to pass, a nut (18) being screwed on the threaded end of said rod for tightening said plate against the bottoms of the upper channels of said panels.

4. A building structure as claimed in claim 1, characterized by the fact that said horizontal metal profile of each panel is provided near its ends with a block (38) with a metal threaded bore which block is welded underneath the bottom wall of the channel and is buried into the panel concrete (5) and that an arm of a horizontal flat plate (35) is fitted into said channel at contact with the upper surface of the bottom wall theref, a hole being provided through the bottom wall of the horizontal channel of each panel coincident with said threaded block, said plate being provided with at least another arm to be fitted into the horizontal channels of the panels to be joined together; one of the arms of the plate being also provided with a hole at the position of said tie rod a nut being screwed onto the threaded end of said tie rod and a bolt being screwed into each of the threaded blocks.

5. A building structure as claimed in claim 1, wherein the wall portions in which building corners, interior walls bondings or graftings are not included are made up with normal panels in which the vertical side metal profiles are embedded into the panel in the median plane of the same; the building corners being made with a normal (5) and a corner panel (23) in which said vertical channel is fitted along the vertical margin of one of the panel faces in such a position that the channel median plane lies on the median plane of the normal panel to which the corner panel is to be joined; the bondings or graftings of an interior wall with a peripheral one being made with a normal panel pertaining to the interior wall and with two graft panels (25) pertaining to the peripheral wall which differ from the normal panels only for the fact that one of the concrete upward projections of the panel between which the upper channel is included terminates at the same position of the profile that is at a distance from the panel vertical side.

6. A building structure as claimed in claim 2, wherein in the case of two normal panels to be joined together said plate means comprises two plates a shorter one (20) to be fitted into the upper metal channel of one of the panels and a longer one (21) to be fitted into the upper metal channel of the other panel; both plates being provided with an upright arm whose centerline lies on the median plane of the panel and being boltable to the upright arm of the other plate; the longer plate being provided with a hole coincident with said tie rod and tightable thereto by means of a nut; in the case of a normal panel to be joined to a corner plane said plate means comprises a plate similar to the longer plate as above fitted into the upper metal channel of the normal panel and a plate (24) provided with an upright arm boltable on the upright arm of said longer plate that is perpendicular to the centerline thereof; in the case of a normal panel to be joined to a pair of graft panels, a first plate (21) with an upright arm perpendicular to the centerline of the plate is fitted into the upper metal channel of the normal panel, a second plate (20) with an upright arm perpendicular to the centerline of the plate is fitted into the upper channel of one of the two graft panels, a third plate (26) with a hole coincident with said rod and provided with an upright arm perpendicular to the centerline of the plate and boltable to the upright arm of said second plate of the other graft panel and provided with an upright arm perpendicular to the median plane of the normal panel and boltable on the upright arm of said first plate; a nut (18) being screwed on tie rod (11) end for tightening said plates on the respective metal channels.

7. A building structure as claimed in claim 1, wherein each of said side metal channellike profiles has a rectangular cross-section lacking one of the longer sides and from each edge of said profile a zig-zagging wing (9', 9", 9"') extends into the concrete mass of the panel and from the bottom wall of the channel a series of undulating tongues (14) which too extend into the concrete mass of the panel.

8. A building structure as claimed in claim 1, wherein said inverted T metal shape (4) is anchored to the foundation slab by means of a series of clamps comprising a pair of jaws (2) bolted together and buried into the slab concrete; the upper end of each jaw being bent in C shape for encompassing one of the flanges of said inverted T shape and the lower ends of the pair of jaws being stretched apart for a better hold on the concrete; the clamp overall dimensions being such that it can be received within the duct defined between the vertical channels of two adjoining panels, a series of holes being provided through the upright leg of said inverted T shape at a distance from one another equal to the width of a panel for hooking a tie rod in each of said holes.

9. A building structure as claimed in claim 1, wherein in the case of a multistoried building the floor (30') between two successive stories comprises a corrugated metal sheet (30) extending over the area of each room of the building with the corrugations running parallel to the shorter sides of the room; the dimensions of said corrugated sheet being such that its borders rest on the upper edges of the room walls the horizontal channellike profiles of the wall panels being left uncovered, the downwards facing furrows being shut at their ends by plates; a layer of concrete mortar being cast over said corrugated sheet; which layer further extends to reach the periphery of the walls by which the room to be covered is surrounded.

10. A building structure as claimed in claim 9, wherein an additional inverted T metal shape (31) is laid on the upper surface of said floor between two successive stories of the building which metal shape lies on the vertical plane of the inverted T shape anchored to the foundation slab; each of said tie rods being extended to surpass for a short length the thickness of the floor between two successive stories; the end section of said rod being threaded from a level lower than the upper edge of the panels of the underlying story upwards; a hole (31") being provided through the flange of the above additional inverted T shape for letting the tie rod pass through; a short section of the shape upright leg being cut away astride of the hole to leave a space for a threaded sleeve to which an extension (33) of the tie rod is screwed which reaches the ceiling of the upper story.