PH12016000018A1

PH12016000018A1 - A concrete building structure assembly and a concrete pre-cast panels thereof

Info

Publication number: PH12016000018A1
Application number: PH12016000018A
Authority: PH
Inventors: Mohammed Omar Jazzar
Original assignee: Mohammed Omar Jazzar
Priority date: 2016-01-08
Filing date: 2016-01-08
Publication date: 2017-07-17

Abstract

The present invention provides a concrete building structure assembly comprising a precast concrete panels such as corner panels and central precast concrete panel slabs. Each panel comprises halved edges slabs along with protruding steel bars. The corner panels comprises one or more slabs and a column having a shear key at the bottom and a cavity at the top to receive a shear key of adjacent column. The assembly of the present invention considerably reduces construction time of the building as well as also reduces thickness of the columns and slabs.

Description

TITLE -

A CONCRETE BUILDING STRUCTURE ASSEMBLY AND A CONCRETE -

PRE-CAST PANELS THEREOF; ee

TECHNICAL FIELD OF THE INVENTION =

The present invention relates to concrete pre-cast panels including a pre- = : cast column and pre-cast slab and a building structure assembly thereof. a

BACKGROUND OF THE INVENTION =

In the previous invention we depended primarily on the rigidity and non- = flexibility of joints between the walls and the floor slabs maintained at right on angles to redistribute the moments that so often are excessive for varying oe durations of time (to the adjacent slabs and floors thereby alleviating the slab moments. This redistribution enabled the use of thinner floor slabs.

Said invention served its purpose however it hade its limitations, as in high rises where redistributing moments from slabs to walls and columns that already have tremendous cumulative axial loads on the walls and columns necessitated much thicker columns which rendered panel economically and esthetically unfeasible. The same applied to large open space slabs such as found in malls and some office buildings where a large space adjacent to a small one exerting severe axial loads and moments.

There where many other limitations for the usage of pre-cast concrete, such as only one way loading (to the two opposite supporting walls or beams such as in hollow core pre-stressed pre-cast) and the inability to have a rigid continuous floor slab, or a smooth ceiling surface or one that could extend rigidly and continuously in both its horizontal directions; so the need for an “off the shelf’ panel that could do all this was needed, one that would almost fit any where (designed for that class of loadings); one where the structure can be built and the wiring done later with no disturbances to panel or any adjacent panels, where large openings on one side or even an open space garage or mall with standard panel sizes would be constructed with great speed and ease. Since rooms are four sided so if distribution is done to all four sides each side share will be about one quarter of weight and even less for moments (as redistribution to adjacent panels would even reduce moments further).

From all the above the need for a new pre-cast concrete system arose, one with thinner slabs columns and walls, one that would redistribute stresses to all four sides and not aggravate (increase) the walls and column moments. 40

SUMMARY OF THE INVENTION ~

Accordingly, the present invention provides a concrete building structure i assembly for a building, comprising a plurality of pre-cast concrete panel = forming a column of the building and one or more pre-cast central slab. or

The said pre-cast concrete panel comprises at least one horizontal slab ho having a peripheral halved step-up edges to half of a thickness of the slab Fe : at all four sides of the slab dividing the horizontal slab into atleast two i» layers, and equidistantly-spaced, parallel steel bars protruding out from ~ one or all four sides of the slab and one or more layers of the slab and a = vertical column provided perpendicularly to the horizontal slab wherein = said slab is connected to the vertical column. The said pre-cast central slab having a peripheral halved edges to half of a thickness of the slab at a all four sides of the slab diving the central slab in two layers with equidistantly-spaced, parallel steel bars protruding out from all sides of the slab for a moment connetion said steel bars have a predetermined length for connection and/or transferring the moment between the two pre-cast central slabs and resting on the halved slab of the horizontal slab of the pre-cast concrete panel to form a continuous slab of the building extending over several bays/rooms independent in moments from the vertical columns of the pre-cast concrete panel below the slab. According to the present invention, predetermined length of the steel bars depends upon the diameter of the steel bar.

The present invention also provides a pre-cast concrete panel forming a column of the building, said pre-cast concrete panel comprising at least one horizontal slab having a peripheral halved step-up edges to half of a thickness of the slab at all four sides of the slab and equidistantly-spaced, parallel steel bars protruding out from one or all four sides of the slab, a vertical column centred perpendicularly below the horizontal slab and attached to the slab by means of a hinged or stiff connection, and a hollow shafts extending vertically through the slab and the vertical column, wherein concrete is flowed into cages within the hollow shafts and concreted to form a continuous column from a foundation to a roof of the building. According to the present invention, the vertical column of the pre- cast concrete panel has a shear key at bottom and a cavity at top for receiving a shear key of the adjacent vertical column.

The present invention also provides a pre-cast concrete central slab for a building, comprising a peripheral halved edges to half of a thickness of the slab at all four sides of the slab with equidistantly-spaced, parallel steel bars protruding out from all sides of the precast central slab, said steel bars have a predetermined length for connection and/or transferring the N moment between the two pre-cast central slabs. -

BRIEF DESCRIPTON OF THE DRAWINGS 7

Reference will be made to embodiments of the invention, examples of os which may be illustrated in the accompanying figures. These figures are += intended to be illustrative, not limiting. Although the invention is generally in described in the context of these embodiments, it should be understood pot : that it is not intended to limit the scope of the invention to these particular - embodiments: =

Figure 1 shows a precast concrete panel forming a column of the building o- according to an embodiment of the present invention; oT

Figure 1A shows a precast concrete panel according to anotherembodiment of the present invention;

Figure 2 shows a precast concrete central slab for a building;

Figure 3 shows a concrete building structure assembly for a building according to the present invention; and

Figure 4 shows a cross sectional view of connection between the precast concrete panel and two precast central panels according to the present invention.

DETAILED DESCRIPTON OF THE INVENTION

The present invention provides a concrete building structure assembly for a building, comprising a plurality of pre-cast concrete panel forming a column of the building and one or more pre-cast central slab.

According to the present invention, the pre-cast concrete panel comprises a horizontal slab having a peripheral halved step-up edges to half of a thickness of the slab at all four sides of the slab dividing the horizontal slab into atleast two layers, and equidistantly-spaced, parallel steel bars protruding out from one or all four sides of the slab and one or more layers of the slab and a vertical column provided perpendicularly to the horizontal slab wherein said slab is connected to the vertical column.

According to the present invention, the pre-cast central slab having a peripheral halved edges to half of a thickness of the slab at all four sides of the slab diving the central slab in two layers with equidistantly-spaced, parallel steel bars protruding out from all sides of the slab for a moment connetion said steel bars have a predetermined length for connection and/or transferring the moment between the two pre-cast central slabs and resting on the halved slab of the horizontal slab of the pre-cast concrete i 40 panel to form a continuous slab of the building extending over several bays/rooms independent in moments from the vertical columns of the pre- ” cast concrete panel below the siab. ho

The present invention is described in detail hereinafter with reference to - the accompanying drawings. faa

Referring Figure 1 shows a precast concrete panel (100) according to the Le present invention. The pre-cast concrete panel (100) forming a column of da : the building, comprises a horizontal slab (2), a vertical column (3) and a wo hallow shaft (6) extends through the vertical column (3). es

As shown in Figure 1, the horizontal slab (2) has a peripheral halved step- = up edges to half of a thickness of the slab at all four sides of the slab (2) and equidistantly-spaced, parallel steel bars (1) protruding out from one or = all four sides of one or both layer of the slab (2). po

In Figure 1, the vertical column (3) is centred perpendicularly below the horizontal slab (2). The horizontal slab (2) can be attached to the vertical 16 column (3) by means of a hinged or a stiff connection (not shown).

Alternatively, the column (3) can be adpated off-centere and perpendicular to the horizontal slab (2) based on the requirements of the building (not shown).

As shown in Figure 1, the horizontal slab (2) is connected near the top of the column (3). Alternatively, the horizontal slab (2) can be connected at top, bottom or middle of the vertical column (3).

In Figure 1, it is shown that one horizontal slab is adapted over the column.

In Figure 1A, two horizontal slabs (2A, 2B) are adapted at a predetermined distance on a single column (3) at a predetermined distance. The predetermined distance depends upon the distance required between roof and flooring of a building.

As shown in Figure 1, the hollow shafts (6) extends vertically through the vertical column (3) and at the end of the construction of the building, the concrete is addedd into cages within the hollow shafts (6) and concreted to form a continuous column from a foundation to a roof of the building.

As show in the magnified view of Figure 1, the vertical column (3) of the pre-cast concrete panel (3) has a shear key (10) at the bottom of the column (3) and a cavity (11) at the top of foundation (50) or the column (3) for receiving a shear key of the adjacent vertical column.

Further, the column (3) of the precast concrete panel (100) has also steel bars (12) extending and protruding from corners (not shown) of the column (3). The end tip of the steel bars (12) are threaded for connection with the steel bars (6) of foundation or column with a proctracted nut (9).

As shown in the Figure 1, the horizontal slab (2) has one or more conduits = (7, 8) penetrating for wiring and post tensioning. bs

Referring Figure 2 shows a pre-cast concrete central slab (200) for a Oo ; building according to the present invention. The precast concrete central on ' 5 slab (200) comprises a peripheral halved edges to half of a thickness of = the slab (200) at all four sides of the slab with equidistantly-spaced, il ‘ parallel steel bars (20) protruding out from all sides of the pre-cast central slab (200). The steel bars (200) have a predetermined length for i connection and transferring the moment between the two pre-cast central - 10 slabs. The protruded steel bars (200) may overlap the protruded steel bars = (26) of an adjacent pre-cast central slab as shown in Figure 4 or may be - connected with an overlapping steel bar or protracted nut. The protruded fou steel bars may have threaded ends for protracted nut.

As shown in Figure 2 and 4, the central slab (200) has waffle-like inverted 15 trapezoidal openings (19) for filling with light weight material (19) upto atleast half of the thickness of the central slab (200). This filling reduce the weight of the central slab.

The central slab solid or made of waffle like joists (200) running perpendicular and horizontally to each other also with embedded steel 20 bars (20) that protrude a sufficient length for transferring the moments to the incoming panel with similar steel extensions. The precast central waffle-like panel (200) has a reinforced concrete rim (22) above it that is offset outwards at least a 30 cm on all sides.

According to the present invention, the steel bars penetrating and 25 extending as one or in sets of two, layered above each other of both slabs, each protruding at least 30 cm from the horizontal slab of the pre-cast concrete panel and the central slab. However, the length of the steel bars depends upon the diameter of the steel bar.

Figure 3 shows concrete building structure assembly (300) for a building 30 and Figure 4 shows a cross sectional view of the connections between the two central slabs according to the present invention. The concrete building structure assembly (300) comprises a plurality of the precast concrete panel (100) assembled over the foundation and precast concrete slab (200) adapted between the four the precast concrete panel (100) 35 overlapping inner corner of each precast concrete panel (100) as shown in

Figure 3. The precast concrete panel (100) provides shear connectivity by halving its horizontal slab thereby providing a shelf of shear for connecting incoming panel. The second part-the moment, provides connectivity by overlapping (25) the continuous steel bars (26) that protrude out of the 40 precast central panel with incoming steel bars and pouring insitu concrete ot (27) in the space between the two precast concrete panel and also ” pouring insitu concrete (28) in the rim (22) thereby forming a monolithic ho continuous slab and allowing the concrete surface pull grip of the moment oe to be transferred on to the adjacent element as showin in Figure 4. Eb

Connectivity in moment can be also achieved by threading the tip ends of es the protruding steel and connecting it to a similarly threaded receiving te ’ element by means of a protracted nut with sufficient grip to both steel bars i” from two adjacent panels. -

A process of of builing using the assembly is explained hereinafter. After = connecting the four precast panels (100) (hereinafter referred as corner 5 panels) to the columns or foundation (50) below them, a temperory steel o beam (not shown) is fastened at forty five degree angle to each of the inward four hole (not shown) facing the centre of enclosure this acts as temporary support for central panel and a tempgrory supporting girders 16 beween the two corner panels. The precast central concrete or solid panel (200) is gently lowered between the four corner panels (100) and similar precast central adjacent panels are also lowered in place between each four corner panels. Two open web steel joists (not shown) with a horizontal panel of steel or ply wood fastened to its top is attached to each of the ends to the two corresponding corner panels on either side. Column : strip extra steel reinforcing bars and various conduits for electrical telecommunication are placed before fresh concrete is poured to tie and stitch or consolidate together into one monolithic slab for the entire floor slab. In cases where the span between the four precast concrete panels is not sufficiently large, the precast central slab may be eliminated and replaced by solid fresh concrete poured after attaching a suspended from corner panels open web supported form with steel bars running in both horizontal directions at right angels to each other protruding a development length beyond the parameter of each bay on all four sides.

Column connections are achieved by overlapping steel from adjacent columns, or by connecting facing ends of steel bars after threading them and screwing on to each side a sufficient length of a protracted nut sufficient to transfer the axial loads and moments to the adjacent side.

Advantageously, post tensioning may be incorporated in the concrete . building structure assembly system by pre-threading conduits in both this 5 system's pre-cast panels, thereby reducing considerably the post - tensioning construction time. i.

Two main features of the concrete building structure assembly system. +

First, by pre-casting a non flexible panel centred on columns and providing - sufficient length for the moments to transfer to cast in situ portions having BN similar opposing in direction steel, the present invention permits the o redistribution of moments that are imposed on one bay to adjacent panels - on each side in both horizontal at right angels to each other direction. This = feature is possible due to the non-bending plates that are centred on the columns that by being lowered on one side must be razed on the opposite side. This feature allows for the redistribution of the moments to neighbouring bays on all four sides. 16 Second, by using a two way loading system ( not a one way loading beam system resting on a one way girder) the slab thickness is minimised as shear is distributed to also the four sides not only two sides have to carry all shear stres¢

EN

ADVANTAGES OF THIS PRESENT INVNETION

This invention / innovation facilitates and makes possible use of pre-cast everywhere and anywhere by accommodating and satisfactorily delivering the two main rules of continuity in engineering that being shear and moment for non interrupted connectivity of any physical materials. It allows speed in installation and erection of construction. One can stress load the following floor columns immediately and finishing works can start first day of erection as there are no hindering stilts and scaffolding on the floors below. Better supervision of panels as they are factory quality. Loading on all four sided not just two reduces the stresses, moments and shears enabling considerable reduction in slabs thicknesses. The rigidity and continuity of the pre-cast panels and their not terminating at the columns enables the transfer and redistribution on the moments to the adjacent poe bays on all sides also the construction joints of column panels at centre of - room height enables the three dimensional redistribution of moments over = the entire building and not just one floor making the structure much more robust and resistant to lateral forces of earthquakes and storms as well as - vertical forces by comparison with other systems. The building may be = disassembled and mover to another location then reassembled in less - time than normal construction by other methods. The concrete building _ structure assembly can be use to build hospitals, housings, hotels upto 12 = storey within 6-8 months. -

The nouns top, bottom, middle etc used in the specification for ” understanding purpose and are not limiting the invention to a meaning of said nouns. Further, it will be apparent to one of the ordinary skill in the art that many modifications, improvements and sub combinations of the various embodiments, adaptations and variations can be made to the invention without departing from the scope thereof as claimed in the following claims:

Claims

CLAIM: ~ [

1. A concrete building structure assembly for a building, comprising: = a plurality of pre-cast concrete panel forming a column of the {T building, said pre-cast concrete panel having: i at least one horizontal slab having a peripheral +a halved step-up edges to half of a thickness of the slab at all nN four sides of the slab dividing the horizontal slab into atleast hes two layers, and equidistantly-spaced, parallel steel bars = protruding out from one or all four sides of the slab and one or more layers of the slab; and on a vertical column provided perpendicularly to the Ts horizontal slab wherein said slab is connected to the vertical column; one or more pre-cast central slab having a peripheral halved edges to half of a thickness of the slab at all four sides of the slab dividing the central slab in two layers with equidistantly-spaced, parallel steel bars protruding out from all sides of the slab through the layers, said steel bars have a predetermined length for connection and/or transferring the moment between the two pre-cast central slabs and resting on the halved slab of the horizontal slab of the pre-cast concrete panel to form a continuous slab of the building extending over several bays/rooms independent in moments from the vertical columns of the pre-cast concrete panel below the slab.

2. The concrete building structure assembly as claimed in claim 1, wherein the vertical column of the pre-cast concrete panel has a shear key at bottom and a cavity at top for receiving a shear key of the adjacent vertical column.

3. The concrete building srutuce assembly as claimed in claim 1, wherein the said slab is connected to the vertical column by hinged connection or stiffed connection.

4. The concrete building srutuce assembly as claimed in claim 1, wherein the vertical column is preferably connected at the centre of the slab.

5. The concrete building structure assembly as claimed in claim 1, 40 wherein the steel bars penetrating and extending as one or in sets of

/ two, layered above each other of both slabs, each protruding at least ” 30 cm from the horizontal slab of the pre-cast concrete panel and the bo central slab. =

6. The concrete building structure assembly as claimed in claim 1, wherein the vertical column of the pre-cast concrete panel has steel In bars having threaded ends for connecting steel bars from adjacent o atop or below of the vertical column by protracted nuts in column bo cavities for providing a continuous moment, axial load and shear — connection. =

7. A pre-cast concrete central slab for a building, comprising a peripheral ad halved edges to half of a thickness of the slab at all four sides of the slab with equidistantly-spaced, parallel steel bars protruding out from all sides of the precast central slab, said steel bars have a predetermined length for connection and transferring the moment between the two pre-cast central slabs.

8. The pre-cast concrete central slab as claimed in claim 7, wherein central slab has waffle-like inverted trapezoidal openings for filling with light weight material upto atleast half of the thickness of the central slab.

9. A pre-cast concrete panel forming a column of the building, said pre- cast concrete panel comprising: at least one horizontal slab having a peripheral halved step-up edges to half of a thickness of the slab at all four sides of the slab and equidistantly-spaced, parallel steel bars protruding out from one or all four sides of the slab; a vertical column centred perpendicularly below the horizontal slab and the horizontal slab attached to the column by means of a hinged or stiff connection; and a hollow shafts extending vertically through the slab and the vertical column, wherein concrete is flowed into cages within the hollow shafts and concreted to form a continuous column from a foundation to a roof of the building wherein the vertical column of the pre-cast concrete panel has a shear key at bottom and a cavity at top for receiving a shear key of the adjacent vertical column. 40

10. A pre-cast concrete panel as claimed in claim 9, wherein two ~ horizontal slabs are connected to the column at a predetermined hd distance. ol

11. A pre-cast concrete panel as claimed in claim 9 or 10, wherein the = slab is connected at the top, bottom or middle of the vertical column. da

12. A pre-cast concrete panel as claimed in claim 9 or 10, wherein the oe horizontal slab has one or more conduits penetrating for wiring and - post tensioning. =

13. A pre-cast concrete panel as claimed in claim 9 or 10, wherein the = vertical column of the pre-cast concrete panel has a hollow shafts extending vertically through the slab and the vertical column, wherein concrete is flowed into cages within the hollow shafts and concreted to form a continuous column from a foundation to a roof of the building.