■NEW PRODUCTCone
type anchor plate
ＪＬ型円錐形アンカープレート
Product overview and features■Background of the development
Conventional anchor plate has been used as the prestressed
concrete anchorage hardware, but it was simply developedby processing a plane iron plate.
But when you use iron plate to put a prestress, especiallywith PC steel strand wire, the plate receive axial rotating
force together with bearing force, so that it will unable
to set the plate horizontally but end up to set diagonally.
When the placement of PC steel set close to the edgeof concrete, the square shaped anchor plate set diagonally,
it would cause a rust.
And when the plate receive axial rotating force, if theconcrete surface has unevenness, the stress at four
corners would break the concrete.
When putting prestress through hydraulic jack directlly
to anchor plate, in order to send the equivalent surface
stress, we have developed this cone type anchor plate.
By calculations and analyzed the data from the scanned
surface pressure, it reduced the cost and improved theworkability.
■Product features●Pressure from hydraulic jack when sending prestressdirectlly to anchor plate, the product enables to send
them equivalentlly.
●The cone type anchor plate does not have four corners
that receive axial rotating force, so it would prevent
breaking concrete by the stress created by unevennessof concrete surface.
●By limitting the cross section area by calculations andannalysing scanned data of surface pressures, we havemade cost down and improvement of workability.
●When using PC steel strand wire, it is no need to worry
about a location of anchor plate that receive bearing
force and axial rotating force.
●When the location of PC steel close to the edge ofconcrete, the cone type anchor plate is no need toconsider the angle of setting the plate, and will notleave square type iron within the covering depth ofjointing concrete.
●Material: SS 400■Comparison of shape

conventional anchor platecone type anchor plate

Standard type■Speciﬁcations

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Special type(Unit：㎜)

PC steelstrand wire

PC steel

Diameter
(S1)

φ17.8

φ23（M24）

φ136

30

φ27

φ70

φ21.8

φ26（M27）

φ155

34

φ30

φ70

φ28.6

φ32（M33）

φ190

40

φ36

φ85

Thickness Hole diameter diameter of(t)(d)top end■Conﬁrmation of the surface stress
Below surface stress scanner shows the analysing resultof surface stress for post-tension type anchor plate.
The anchor plate supposed to have a hole to input
grout.
◎Conventional anchor
plate
28 x135 x 135(maximum load: 60tonf)◎Cone type circle
anchor plate plate
34xφ155(maximum load:60tonf)◎Cone type circle anchor plate (w/spherical seat for
diagonal load) 34xφ155(maximum load:60tonf)
0°

Based on the results of above, it shows that theconventional anchor plate creat bending moment fromthe hole to input grout which is fulcrum that lead tocreat reaction force. It caused invisible deformation
at the edge that lead bad inﬂuence to disperse thesurface pressure.
The result from cone type circle anchor plate showingthat the surface pressure dispersed evenly than theconventional anchor plate. As for the anchor plate w/
spherical seat for diagonal load(maximum15°), surfacepressure widelly dispersed not depending on thediagonal angle. As a result, cone type circle anchor
plate shows better than conventional anchor plate.

Reference for a working drawingⅷ

w/Spherical seatfor diagonal load