Multiquip WSHE_A_SERIES - Manual (Page 20)

page 20 — WSHe/a vibraTory TruSS Screed • operaTion manual — rev. #0 (05/22/12)
General infOrMatiOn
Self-propelled models are each mounted on a 2.5-foot
section of the screed. Crowns/Inverts may be obtained
with optional kits.
roTaTing eccenTric SHaFT (reS)
vibraTory Screed
The rotating eccentric shaft produces over 8000 VPM. The
shaft is built of 3/4" diameter, high strength steel with 1-3/8"
diameter dual eccentrics bolted on 30" centers. The shaft
is supported by heavy-duty, solid-mounted pillow block
bearings (the bearings are greaseable and provide long
life and solid transmission of vibration through the lower
frame and blades into the concrete).
propelling THe Screed
Several options are available for moving the screed during
a pour.
1.
manual Winches — Heavy Duty 2500 lb., 2 speed
winches with 100 feet of 1/8" aircraft cable can be
located on either end of the screed or with the addition
of a pulley kit, both sides of the screed can be winched
from on side.
2. Hydraulic Winches — By adding a pulley to the
rotating eccentric shaft, power can be harnessed
to drive a small Parker hydraulic pump. This pump
provides power to an Eaton drive motor driving the
winches located on either side of the screed. The speed
of the winch is variable from 0 to 12 feet per minute.
inverTS and croWnS
Multiquip Vibratory Screeds can be aligned to form inverts
or crowns with the use of special Invert/Crown Brackets,
Flex-Joint or U-Joint kits. Crowns of up to 1/4-inch per foot
are considered normal. Most highway specifications call for
1/4-inch per foot or 2% crowns. (.25 inches per 12 inches)
Screed WidTH
The recommended maximum length is 65 feet for both
air and engine driven screeds. With lengths over 35 feet,
the engine should be mounted on a center section of the
screed. This increases efficiency and equalizes the load
on the driveshaft.
Slab THicKneSS
Like soil compaction, slab thickness is variable. Maximum
slab thickness depends on the concrete mix, type of forms
used, travel speed and other variables. The Rule of Thumb
is: 8 to 9 inches for the RES type and up to 12 inches for
the air screed.
raTe oF Travel
The rate of travel for the screed varies. The men working
the concrete should maintain a slight discharge of concrete
in front of the screed. ( do noT allow concrete to flow over
the screed blades by more than 2-1/2".) As you move the
screed forward, you should be getting a nice, creamy
surface behind the bull float blade. Increase the travel speed
until the surface deteriorates and then slow down slightly
to achieve maximum travel speed.
commonly aSKed QueSTionS:
1. “How wide can I go with the vibratory screed?”
Recommended maximum length is 65 feet for both air
and engine driven screeds. With lengths over 20 feet,
the engine should be mounted on a center section of
the screed. This increases efficiency and equalizes the
load on the driveshaft.
2. “What is the maximum slab thickness I can expect to
effectively consolidate?”
Like soil compaction, this is variable. It depends on
the concrete mix, type of forms used, travel speed and
other variables. The rule of thumb is: 8 to 9 inches for
the RES type and up to 12 inches for the air screed.
3. “At what rate of travel should I work the screed?”
It varies. The men working the concrete should maintain
a slight discharge of concrete in front of the screed.
(Do not allow concrete to flow over the screed blades
by more than 2-1/2".) As you move the screed forward,
you should be getting a nice, creamy surface behind
the bull float blade. Increase the travel speed until the
surface deteriorates and then slow down slightly to
achieve maximum travel speed.