IES83333Y1 - A pre-cast reinforced concrete slab - Google Patents
A pre-cast reinforced concrete slabInfo
- Publication number
- IES83333Y1 IES83333Y1 IE2003/0432A IE20030432A IES83333Y1 IE S83333 Y1 IES83333 Y1 IE S83333Y1 IE 2003/0432 A IE2003/0432 A IE 2003/0432A IE 20030432 A IE20030432 A IE 20030432A IE S83333 Y1 IES83333 Y1 IE S83333Y1
- Authority
- IE
- Ireland
- Prior art keywords
- bars
- mould
- formers
- bed
- reinforced concrete
- Prior art date
Links
- 239000011150 reinforced concrete Substances 0.000 title claims description 16
- 238000007493 shaping process Methods 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000004567 concrete Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 230000003014 reinforcing Effects 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000005452 bending Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 abstract description 2
- 239000011178 precast concrete Substances 0.000 abstract 2
- 240000000800 Allium ursinum Species 0.000 description 8
- 238000010276 construction Methods 0.000 description 2
- 230000000295 complement Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Abstract
ABSTRACT A process for manufacturing pre—cast concrete lloor slabs includes shaping a number of steel bars at a shaping station. A number of spaced-apart loops are formed in the bars by pressing the bars downwardly between spaced-apart cylindrical formers at the shaping station. A pair of the shaped bars are mounted in a slab-forming mould, at opposite sides of the mould, together with a steel reinforcing frame. The mould is then filled with concrete, leaving the loops of the bars projecting upwardly of the top surface of the concrete. After setting the concrete to form the pre—cast concrete slab , the slab is removed from the mould.
Description
A pre-cast reinforced concrete slab“
This invention relates to a process and apparatus for manufacturing a pre-cast
reinforced concrete slab, and in particular slabs used in the construction of floors in
buildings.
According to the invention there is provided a process for manufacturing a pre-cast
reinforced concrete slab, comprising the steps:
forming a plurality of shaped tie bars by delivering elongate steel bars to a
shaping station,
at the shaping station laying the steel bars side by side on a shaping bed, the
bars extending across a plurality of space-apart formers which are seated on
top of the bed,
securing the bars on the formers,
delivering a press beam on a carriage incrementally along the bed between a
number of bending positions,
at each bending position positioning the press beam between an adjacent pair
of formers and stopping the carriage,
extending the press beam downwardly to press the bars downwardly together
between the formers and then retracting the press beam,
shaping a number of spaced—apart loops in the bars in this manner for
forming the shaped tie bars,
delivering the tie bars to a moulding station,
at the moulding station mounting a pair of the tie bars in a slab forming mould,
locating the tie bars adjacent opposite sides of the mould,
inserting a steel reinforcing frame into the mould with a top of each tie bar
projecting above the reinforcing frame,
pouring a quantity of liquid concrete into the mould, covering the steel
reinforcing frame with the concrete and leaving an uppermost portion of each
tie bar projecting upwardly from a top surface of the concrete in the mould,
setting the concrete in the mould to form the reinforced concrete slab, and
removing the reinforced concrete slab from the mould.
in a preferred embodiment of the invention the process includes clamping the bars at
each bending position by extending a clamp beam which is mounted on the carriage
to engage and clamp the bars against the bed before extending the press beam
downwardly for shaping the bars.
in another embodiment the clamp beam is extended downwardly for engagement
with the bars within previously formed looped portions of the bars.
In a further embodiment the process includes securing the bars on the formers by
laying a cross bar across the bars at each former and fastening the cross bar to the
former for clamping the bars between the cross bar and the former.
In a preferred embodiment the formers are cylindrical in shape, the formers being
mounted on the bed in a parallel spaced—apart relationship.
The invention will be more clearly understood by the following description of some
embodiments thereof, given by way of example only with reference to the
accompanying drawings, in which;
Fig. 1 is a perspective view of a pre—cast reinforced concrete slab
manufactured according to the process of the invention;
Fig. 2 is an elevation view of a shaping station used in the process;
Fig. 3 is an end elevational view of the shaping station;
Fig. 4 is a detail perspective view showing portion of the shaping station;
Fig. 5 is a schematic elevational view illustrating operation of the shaping
station; and
Fig. 6 is an elevational view of a shaped tie bar formed during the process at
the shaping station.
Referring initially to Fig. 1 there is shown a pre-cast reinforced concrete slab
manufactured according to the process of the invention indicated generally by the
reference numeral 1. The slab 1 has a reinforced concrete body 2 of generally
rectangular shape. It will be noted that roughly midway along a top face 3 of the slab
1 at opposite sides of the slab 1 a number of spaced-apart steel loops 4 project
upwardly above top face 3 of the slab 1. These are for the reception of and
engagement with tie rods which extend between loops 4 on adjacent slabs 1 which
are laidside by side in a building to construct a floor prior to covering the slabs 1 with
a further layer of concrete to provide a uniform floor surface.
A process for manufacturing the slab 1 will now be described. Shaped tie bars 10
(Fig. 6) are formed by delivering elongate steel bars to a shaping station 12. The
shaping station 12 has a ground engaging frame 13 formed by a pair of spaced-apart
elongate l-beams 14 interconnected by a number of box section cross beams 15. A
shaping bed 16 is supported on the frame 13 and comprises a bed plate 17 mounted
between upper flanges 18 of the I-beams 14. A number of spaced-apart cylindrical
formers 20 are mounted spaced-apart on the bed plate 17 in a parallel relationship.
Locking bolts 22 project upwardly at each end of each former 20 for engagement by
a complementary cross bar 23 which can be extended between the locking bolts 22
and secured thereto by lock nuts 24. Rails 25 extend along an outer edge of each
upper flange 18 of the I-beams 14. A carriage 30 is moveable along the rails 25
between opposite ends of the shaping bed 16. Rollers 31 on the carriage 30 engage
the rails 25 for rolling the carriage 30 along the shaping bed 16.
A press ram 34 is mounted on the carriage 30 and comprises a box section press
beam 35 mounted by a pair of spaced-apart rams 36 on the carriage 30 above the
shaping bed 16. The rams 36 are operable to raise and lower the press beam 35.
Mounted on the carriage 30 behind the press beam 35 is a clamp beam 38 which is
also of box section and is secured on the carriage 30 by means of a pair of rams 39
which are operable to raise and lower the clamp beam 38 on the carriage 30. All the
rams 36, 39 are connected to a hydraulic power supply for operation of the rams 36,
39.
To form the shaped tie bars 10 a number of elongate steel bars 50 are laid side by
side on the shaping bed 16, lying across the formers 20 as shown in Figs. 4 and 5.
The bars 50 are secured to each former 20 by laying a cross bar 23 over the bars 50
in engagement with the locking bolts 22 and securing the cross bars 23 to each
former 20 by means of the lock nuts 24. This prevents any vertical movement of the
bars 50 but will allow longitudinal movement ‘rt required to accommodate bending as
described later. The carriage 30 is advanced to position the press beam 35 between
a first pair of formers 20 on the shaping bed 16 and the rams 36 operated to extend
the press beam 35 downwardly thus pressing the bars 50 downwardly between the
formers :20 forming a loop in the bars 50. The press beam 35 is then retracted and
the carriage 30 is moved along the rails 25 to position the press beam 35 above the
next pair of formers 20. Before lowering the press beam 35 the clamp beam 38 is
lowered by the rams 39 into the previously formed loop 51 to securely clamp the bars
50 against the bed 17. Then the rams 36 are extended to move the press beam 35
downwardly to form the next loop 51 in the bars 50 as shown in Fig. 5. The carriage
is moved incrementally along the bed 16 in this fashion forming a new loop 51 in
the bars 50 between each pair of formers 20. When the carriage 30 reaches the end
of the bed 16 it is returned to the start position and the shaped tie bars 10 with the
loops 51 are then removed from the shaping station 12 and delivered to a moulding
station.
At the moulding station a pair of the tie bars 10 are mounted in a slab forming mould,
the tie bars 10 being located at opposite sides of the mould. A steel reinforcing frame
is also inserted into the mould with a semi-circular loop 4 at a top of each tie bar 10
projecting above the reinforcing frame. A quantity of liquid concrete is poured into
the mould covering the steel reinforcing frame but leaving an uppermost portion of
each loop 4 of the tie bar 10 projecting upwardly from the top surface of the concrete
in the mould (thus leaving the exposed loops 4 shown in Fig. 1). The concrete is
allowed to set in the mould to form the reinforced concrete slab 1 and then the
reinforced concrete slab 1 is removed from the mould.
The invention is not limited to the embodiments hereinbefore described which may be
varied in both construction and detail within the scope of the appended claims.
Claims (1)
1. -'A process for manufacturing a pre-cast reinforced concrete slab, comprising the steps: 5 forming a plurality of shaped tie bars by delivering elongate steel bars to a shaping station, laying the steel bars side by side on a shaping bed, the bars extending across a plurality of spaced-apart formers which are seated 1 O on top of the bed, securing the bars on the formers, delivering a press beam on a carriage incrementally along the bed 15 between a number of bending positions, at each bending position positioning the press beam between an adjacent pair of formers and stopping the carriage, 2 0 extending the press beam downwardly to press the bars downwardly between the formers and then retracting the press beam, shaping a number of spaced-apart loops in the bars in this manner for forming the shaped tie bars, 2 5 delivering the tie bars to a moulding station, at the moulding station mounting a pair of the tie bars in a slab forming mould, locating the tie bars adjacent opposite sides of the 30 mould, ‘ inserting a steel reinforcing frame into the mould with a top of each tie bar projecting above the reinforcing frame, pouring a quantity of liquid concrete into the mould covering the steel reinforcing frame with the concrete and leaving an uppermost portion of each tie bar projecting upwardly from a top surface of the concrete in the mould, setting the concrete in the mould to form the reinforced concrete slab, and A removing the reinforced concrete slab from the mould. A process as claimed in claim 1 including the step of clamping the bars at each bending position by extending a clamp beam which is mounted on the carriage to engage and clamp the bars against the bed before extending the press beam downwardly for shaping the bars. A process as claimed in claim 1 or claim 2 including extending the clamp beam downwardly for engagement with the bars within previously formed looped portions of the bars, and including securing the bars on the formers by laying a cross bar on the bars at each former and fastening the cross bar to the former for clamping the bars between the cross bar and the former, the formers being cylindrical in shape, the formers being mounted on the bed in a .parallel spaced-apart relationship. A process for manufacturing a pre-cast reinforced concrete slab substantially as hereinbefore described with reference to the accompanying drawings. A pre-cast reinforced concrete slab whenever produced by the process as claimed in any preceding claim.
Publications (2)
Publication Number | Publication Date |
---|---|
IE20030432U1 IE20030432U1 (en) | 2004-03-10 |
IES83333Y1 true IES83333Y1 (en) | 2004-03-10 |
Family
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