2/2002
CONCRETE FLOOR JOINT
The reinforcement acts as
a casting mould, replacing
separate dovels and edge steels
www.peikko.com
CONTENTS:
1. DESCRIPTION OF THE SYSTEM ................................................ 3
1.1 LS 1 For light loads............................................................... 4
1.2 LS 2 For heavy loads ............................................................ 5
1.3 LS 3 For doorways................................................................ 6
2. APPLICATION AND DESIGN ....................................................... 7
3. INSTALLATION............................................................................. 8
3.1 Installation in stages ............................................................. 8
1. DESCRIPTION OF THE SYSTEM
Peikko® expansion joints makes floor construction faster and
easier. With expansion joint reinforcements, you can make
functionally reliable joint solutions.
Expansion joints LS1, LS2, and LS3 act as casting moulds, the
necessary dovels and edge steels have already been attached to
them. The angle profile of one side has been attached so that it
comes loose from the metal mould as the floor contracts. The
round dovel plate handles the shrinkage because on the other
side, it has been separated from the concrete with a plastic pocket.
Ordering an expansion joint is based on the thickness of the slab.
In practice, it is worthwhile ordering a reinforcement 10 mm lower
than the slab s height. A small gap between the bedding and the
joint reinforcement guarantees that variation in the height of the
bedding does not harm the installation of the joint reinforcement.
Recommended floor thickness is 100  200 mm.
Figure 1. Peikko s LS -expansion joint for base slabs
The new joint system offers the following benefits
compared to the earlier ones.
" fast and easy to install, shortens the production time significantly
" for use with both longitudal and transverse joints
" incorporates the edge forms and reinforcement in a single product
" requires no additional joint reinforcement
" eliminates the need for sawn joints
" prevents warping of edge detail
3
1.1 LS 1 FOR LIGHT LOADS
LS 1 is used for floors that have to endure light loads, such as the
weight of light vehicles. The steel for the floor can be delivered
uncoated, primed, hot galvanized, or on special orders stainless.
The dovel plate is normally delivered uncoated or on special orders
galvanized. The metal profile is normally hot galvanized sheet
metal. The delivery length of the steel is six metres.
" light vehicles
" light forklift trucks with rubber tyres
Figure 2. LS 1
Materials LS 1
1 5x40 S355JO
2 Ø6 c/c300 BSt500S
3 Ø150x6 c/c 400 S355JO
4 KZN sheet metal
A order example, with slab thickness of 100 mm
Code LS1-90-6000
LS1 Expansion joint type
90 Profile height
6000 Length of the expansion joint unit
4
1.2 LS 2 FOR HEAVY LOADS
LS 2 is used for floors that have to endure heavy loads. The angle
steel can be delivered uncoated, primed, hot galvanized, or on
specials order stainless. The dovel plate is normally delivered
uncoated or on special orders galvanized. The metal profile is
normally hot galvanized sheet metal. The delivery length of the
steel is 6 metres.
" Heavy vehicles
" Forklift trucks with hard tyres
" Heavy forklift traffic
Figure 3. LS 2
Materials LS 2 LS 2
for slab thickness of ( 90-150 ) for slab thickness of ( 160-200 )
1 L40x40x4 S235JRG2 L50x50x5 235JRG2
2 Ø6 c/c300 BSt500S Ø6 c/c300 BSt500S
3 Ø150x6 c/c 400 S355JO Ø150x6 c/c 400 S355JO
4 KZN sheet metal KZN sheet metal
A order example, with slab thickness of 160 mm
Code LS2-150-6000
LS2 Expansion joint type
150 Profile height
6000 Length of the expansion joint unit
5
1.3 LS 3 FOR DOORWAYS
LS3 is used for doorways that are insulated, for example the
boundaries between indoors and outdoors. The joint type can also
be used as a duct channel. It can also be used in situations where
differential movement between the slabs is expected to occur. The
lid is stiffened for heavy loads with plate steels.
Light loads
" Light vehicles
Heavy loads
" Heavy vehicles
" Forklift trucks with rubber tyres
" Forklift trucks with hard tyres
Figure 4. LS 3
Materials LS 3A (Light loads) LS 3B (Heavy loads)
1 60x40x5 S235JRG2 60x40x5 S235JRG2
2 Ø6 c/c300 BSt500S Ø6 c/c300 BSt500S
3 UPE 100 UPE 100J (stiffeners)
An order example
Code LS3A 6000
LS3A Expansion joint type
6000 Length of the expansion joint unit
6
2. APPLICATION AND DESIGN
The dovel is located close to the centre axis of the slab. The shape
of the dovel is round and it is located off center in the joint. The
other side of the dovel anchors to the slab, while on the other side,
is separated from concrete with a plastic pocket.
The pocket enables changes in the slab s humidity, temperature,
and shrinkage. When used outside, you must be sure to check the
size of temperature changes. It is recommended to use square or
almost square shaped slabs in outdoor application. Transfers
shearing forces from one slab to another as well as protect against
horizontal movement. Fits also to thinner slabs.
In standard reinforcement, the dovels are located at a distance of
c/c 400. Other c/c distances have to be ordered separately. LS-
expansion joint is not recommended for use as a force transmitting
structure in slabs thinner than 100 mm.
Figure 5. Peikko-Dovel
Table 1. In the following table is the comparison between Peikko-dovel plate and
traditional round dovels. (BSt500S/A500HW)
Peikko-Dovel spacing 400 mm
Diameter of c/c 250 mm c/c 300 mm c/c 350 mm c/c 400 mm c/c 450 mm c/c 500 mm c/c 600 mm
round dovel
12 mm OK OK OK OK OK OK OK
16 mm OK OK OK OK OK OK OK
20 mm The bending capacity of Peikko-Dovels is not enough OK OK
25 mm
7
3. INSTALLATION
The reinforcement is installed onto installation pieces or installation
dovels and attached at the correct elevation. A connection has to
be made at least in the area of the sheet metal s joints and exten-
sions, preferably with approximately 1 metre distance between
connections. The straightness of the reinforcement has to be
checked.
The bonds are bent out and attached to other reinforcement. The
other reinforcement of the slab cannot be supported by the expan-
sion joint. This reinforcement does not support walking on it.
It is recommended to loosen the bolts operating as transportation
support before both sides of the reinforcement have been cast.
The sealing of the joint is done only after at least half of the
shrinkage has taken place.
3.1 INSTALLATION IN STAGES
1) Levelling the bedding
The levelling of the bedding has to be done as well as possible.
The expansion joint is usually 10 mm lower than the slab.
Please note that because of this, the levelling of the bedding
cannot be more than +10 mm of the target level.
2) Attachment bedding
An attachment can be made
A. supported by concrete blocks, by bolting or welding them
to the attachment plates.
8
B. by welding to ribbed bars placed in the bedding.
C. the reinforcement is fixed to the right elevation and location by
levelling pieces. Two bonds are bent downwards in the area of the
levelling pieces. Then, cast the concrete blocks upon the foot of the
reinforcement, so that the bonds attach to the block.
In general, wooden pieces used in attachment should not be left
underneath the floor, but must be either removed or steel pieces
should be used replace with, for example.
9
Note! Expansion joints are not allowed to attach to load bearing
vertical structures (walls and columns), because of the
movement of the structures.
3) Attachment density
The reinforcement has to be attached so closely that casting
pressure won t bend it. Usually, a distance of 1 metre between
attachments is sufficient, but in any case, the distance between
attachments in the area of sheet metal joints should not be
more than 2 metres. Casting pressure can be reduced by
casting both sides of the reinforcement simultaneously.
Also, connecting the bonds to other reinforcements prevents
the reinforcement from bending and/or falling.
4) LS 1
The bonds are bent outwards and attached to other
reinforcement. Because the sideways stiffness of LS 1 is rather
low, the straightness of its upper edge has to be checked.
LS 2
The bonds are bent outward and attached to other
reinforcement. Straightness has to be checked. Other
reinforcement cannot be supported by joint reinforcement,
so the support has to be provided separately. Putting loads on
the reinforcement during fixing work and casting has to be
avoided because the reinforcement does not support, for
example, walking on it before the concrete has hardened.
5) Connections of joint parts
Expansion joint parts are connected to each other by fastening
weld (not load bearing weld) on site. So they yield when
necessary.
6) Joining
Sealing must be done only after at least half of the shrinkage
has taken place.
10
Teräspeikko Oy
P.O.Box 104, FIN-15101 Lahti, Vipusenkatu 20
Tel. [phone], fax [phone]
www.peikko.com
Markprint Oy, Lahti, 2002