Features of Practfence

Full-scale heavy weight collision experiments

Can be installed on the mountainside as well as on the roadside

We performed full-scale heavy weight collision experiments while varying the space between posts from 3.0 to 6.0 m and found that
Practfence can absorb rockfall energy of up to 60 kJ and the maximum deformation does not exceed 1.0 m.

The conventional Rock Fence requires concrete foundation works,
and in some cases, also needs massive excavation and backfill of thenatural ground and asphalt re-pavement for installation. Practfence
dispenses with concrete foundation works by adopting anchor
foundations, and therefore can be installed on a mountainside
almost without damaging the natural ground.
It has been confirmed that the deformation of Practfence does notexceed 1 m by full-size experiments applying rockfall energy of up to60 kJ. So, it can also be installed on the roadside for the purposes ofincreasing the height of existing fences and replacing aging fences.

Conventional Rock Fence
Hanging rope

[Mountainside]

Side rope

Weight[Roadside]

Excavation of natural groundEnd postRe-pavement

Stay rope
Installation lengthIntermediate Space between Horizontal rope
postposts
and wire net

Side rope

柵高Practfence

Experiment figure

Scene of experiment

Experiment with an energy of 30 kJ and spacing of 3.0 m

An economical and universal rockfall
protection method, which keeps
the environment as it is.

Installation on the hillside behind a private house

Installation on the roadside

Installation on the mountainside

Easy to install, maintain, and repair
Experiment with an energy of 30 kJ and spacing of 6.0 m

In principle, Practfence can be installed
quickly without using scaffolds or large
construction machines. When memberssuch as posts and nets are damaged byrockfall, they can easily be replaced.

Tokyo Rope learned a lot from “Rock Fence”, a general-purpose rockfall protection
fence. Practfence is a small-scale universal rockfall protection fence developed by
improving the economic efficiency, workability, and ease of maintenance of
conventional protection fences while maintaining the existing protection functions.
Post installation

Practfence is an extremely eco-friendly and cost-effective rockfall protection

Experiment with an energy of 60 kJ and spacing of 3.0 m

Wire net spreadingmethod making use of the slope shape for installation and dispensing with concrete
foundations, which make the slope unstable, and scaffolding works, which makethe construction period longer.

Also suitable for temporary installation in case of emergency
Practfence does not need concrete
foundation works or curing period. Also,
Practfence uses light members, and somembers can be efficiently lifted andwithdrawn using a monorail or the like.
Practfence is suitable for temporary
installation for disaster restoration in case ofemergency.

Experiment with an energy of 60 kJ and spacing of 6.0 m

Driving an anchor into the soil and sandLifting up members using a monorail

Construction procedure

1Anchor foundation works

2

Erection of posts
Stretching hanging ropes
and side ropes

Stay rope

Cement anchor
Post base plate

Post

Hanging rope

3

Stretching horizontal ropes
Installation of space holders
Horizontal rope
Space holder

4

Spreading wire net andauxiliary wire net

Maximum deformation

Wire net

Side rope

Bedrock

1.0 m line

30 kJ, spacing of 3.0 m

1.0 m line

30 kJ, spacing of 6.0 m

1.0 m line

60 kJ, spacing of 3.0 m

1.0 m line60 kJ, spacing of 6.0 m

Models and specifications
Number andSpecifications
specificationsof hanging
of horizontal ropes
ropeModelFenceheightPFS-202.018φ・73.018φ・10(m)PFS-25
PFS-30

PFM-20
PFM-25
PFM-302.518φ・82.018φ・73.018φ・102.518φ・8

Spacing
betweenposts

Wire net(mm)16φCross-sectional dimensions
Intermediate andend posts(m)

3.2φ×50×50

4.5t×65

4.0φ×50×50

Consideration of snow load

Gojo City, Nara Prefecture (Model PFS-25)

Rope
end fittings

Space between posts: aａ

HorizontalropeIntermediate
post

Diamondwire net

Fence height

End post

Post base platefor rocks

Space holder
Post foundation anchor
for soil and sand

Cement anchor for rocks

In snowy areas, it is necessary to consider snow loadin addition to rockfall. The protection performanceof Practfence is confirmed more precisely byexamining each member. The figures below show
the relation between the allowable snow depth of a
2.5 m high fence and the glide factor (though itslightly depends on the type of anchor).
Model PFS-25 (Slope gradient: 40 degrees)

2.5
Snow depth (m)Side rope
* 2 pcs. at the top andbottom, total 4 pcs.

AnchorHanging rope

1.5
1.0Anchor
Hanging rope

345
Space between posts (m)6Model PFM-25 (Slope gradient: 40 degrees)

Diamondwire netenc

Fehtighe

Auxiliary diamondwire net

Snow depth (m)3.0Stay rope

Displacement Suppression TypeRockfall Protection Fence

N=4.8
N=3.6
N=2.7
N=2.0

2.0

0.5

Cross section of intermediate post

Cross section of end post

Hamamatsu City, Shizuoka Prefecture (Model PFS-25)

60kJ

H-125×125×6.5×9

Structural diagramAnchor

30kJ

H-100×100×6×8
6.0(Standard)

18φSpace holder

Withstandrockfallenergy

N=4.8
N=3.6
N=2.7
N=2.0

2.5
2.0
1.5

Side rope

1.0345
Space between posts (m)6TOKYO ROPE MFG. CO., LTD.
Shiiba Village, Higashi Usuki District, Miyazaki Prefecture (Model PFS-20)

TOKYO ROPE MFG. CO., LTD.
NIHONBASHI FRONT BLDG. 6-2 NIHONBASHI 3-CHOME CHUO-KU TOKYO 103-8306 JAPAN
Tel.: + 81 3 6366 7788, Fax: +81 3 3278 6870

The Representative office of Tokyo Rope MFG. CO.,LTD. in Moscow
22, Bolshaya Yakimanka str., Moscow, 119180, Russia
Tel.: + 7 495 645 04 03, Fax: +7 495 645 04 09

The Representative office of Tokyo Rope MFG. CO.,LTD. in Kazakhstan
Office No. VP-62,7th floor,Business center “Na Vodno-Zelyonom Bulvare”,
BLDG No. 12/1, D. Kunayev Street,Astana city, 010000, Republic of Kazakhstan
Tel.: + 7 7172 500 759, Fax:+ 7 7172 500 780

INTERNATIONAL INVESTORS Co. Ltd
Official Agent of Tokyo Rope MFG., CO. LTD in Kingdom of Saudi Arabia
Office 7 Dinaar Commercial Center, King Abdulaziz Road
PO Box 104451, Jeddah 21331, Saudi Arabia
Tel.: +966 12 236 5511, Fax:+ +966 12 236 5522

Okazaki City, Aichi Prefecture (Model PFM-20)

http://www.tokyorope.co.jp/english

TOKYO ROPE MFG. CO., LTD.
16-03-AVN