®

TOKYO ROPE MFG. CO., LTD.

It efficiently absorb rock fall energy
be utilizing flexible Cableand steel made Post.
It is a structure absorbing rock fall energy by plastic deformation of Wire Netting Cable, andPost. It is generally installed together with a concrete foundation and catches rock falls
before they reach the road. In addition to the standard type ROCK FENCE, we offer aBASEPLATE TYPE ROCK FENCE that can be installed on existing retaining walls, and the ROCKGUARD with enhanced functions.

1ROCK FENCE
Height: 1.5～6.0m

BASEPLATE TYPE ROCK FENCE
Post Spacing: 3.0m

Absorbable Energy: 50kJ

Height: 1.5～3.0m*

Post Spacing: 3.0m

Absorbable Energy: 50kJ

ROCK GUARD
Height: 1.5～3.0m*

Post Spacing: 6.0m

Absorbable Energy: 150kJ*Please contact the person in charge in case of fence height exceeding 3.0 m.

SURFACE TREATMENT
Standard Specification Galvanizing
Hot-dip galvanizing is applied to each member.
Environmental Measures Specification Zinc Plating + Powder Coating after Plating
Post and Space Keeper are subjected to powder baking finish after plating.
The wire mesh is color galvanized and the other parts are galvanized.
Environmental Measures Specification Toff-Coated Specification
High corrosion resistance and acid / alkali resistance by heavy anti corrosion treatment combining
plating and modified saturated polyester resin coating is realized. The expected life is 35 years in highsalt damage area and more than twice in normal area than the salt damage area.
Toff-Coated Product2

ROCK FENCE®

CHARACTERISTICS OF THE ROCK FENCE

1 It is a logical and safe design.

It is a logical structure to absorb rockfall energy by plastic
deformation of wire mesh, wire rope, and pole. For possible
absorbable energy, refer to the technical data sheet.

2 The Cable is Connected with the Space Keeper.

Space keeper material prevents "slip through" phenomenon inwhich Cable spreads out by rock fall.

3 Abundance in Fence Height.

RF-10

Fence height range from 1.5 m to 6.0 m as the standard
specification, and can be selected from straight Post or curved Post.

4 Easy Construction and Economical.

Installation / assembly work is easy. There is also a BASEPLATE TYPE
that facilitates replacement work and post-installation work. The
construction costs as well as the material costs are cheap andeconomical.
RF-13

RF-7

3

MODEL/SPECIFICATION
MODEL

RF-5, RF-7, RF-8, RF-10, RF-12, RF-13, RF-15, RF-17, RF-18, RF-20

FENCE HEIGHT(m)1.5～6.0

POST SPACING(m)3.0

CABLE(WIRE ROPE)

3×7 G/O 18φ (Conforming to JIS G 3525)

WIRE NETTING

Chain link wire netting 3.2φ×50×50 (Conforming to JIS G 3552)

30゜

NOTE1) FENCE HEIGHT

H2

Break load：160kN

END POST･MIDDLE POST

Rolled Structural Steel(SS400)(JIS G 3101)

SPACE KEEPER

Material-A:4.5t×65×680 Material-B：4.5t×65×980Material-C:4.5t×65×382 Rolled Structural Steel (SS400) (JIS G 3101)

U-BOLT

M12×40×60

ROPE END BRACKET

25φ×500H

H１NOTE2) When the fence height is 3.5 m or more, if theinfluence on the road side due to deformation of thesupport is a concern, attaching the stay rope iseffective to prevent excessive deformation.

Strength: 160 kN or more

NOTE3) The Post Spacing of the gradient section shall be theoblique distance.

FENCE HEIGHT ( m )MATERIAL CROSS SECTION (mm )NUMBER ofSTRAITMODEL
CURVED POSTCABLE
POST（PCS）

MIDDLE POSTNUMBER USED on SPACE KEEPER*STRAITPOST

CURVED POST

MAIN SUPPORTAA

2END POSTH

H1H2RF-51.5ーー5H-200×100×5.5×8

H-150×150×7×10[-100×50×5×7.5RF-72.0ーー7

H-200×100×5.5×8

H-175×175×7.5×11[-100×50×5×7.5RF-8

2.5

1.60.98

H-200×100×5.5×8

H-200×200×8×12[-150×75×4.5RF-10

3.0

2.10.910

H-200×100×5.5×8

H-200×200×8×12[-150×75×4.5RF-12

3.5

2.60.912

H-200×100×5.5×8

H-200×200×8×12[-150×75×4.5RF-13

4.0

3.10.913

H-200×200×8×12

H-200×200×8×12[-150×75×6.5×10RF-15

4.5

3.3

1.2

15

H-200×200×8×12

H-200×200×8×12[-150×75×6.5×10RF-175.0

3.8

1.2

17

H-200×200×8×12

H-200×200×8×12[-150×75×6.5×10RF-18

5.5

4.3

1.2

18

H-200×200×8×12

H-200×200×8×12

RF-20

6.0

4.8

1.2

20

H-200×200×8×12

H-200×200×8×12POSTBBC

22

1

13

3

12

1322

14

131142312451[-150×75×6.5×101541[-150×75×6.5×10256112*Number Used Per Place

RF-7 STRUCTURE

275

175

[ROAD SIDE]

1500

BIND WIREWIRE
NETTINGMIDDLE POST
4.0φ WIRESPACEKEEPERU-BOLTMIDDLE POST
U-BOLT

1752752000
100302850
175

4.0φ WIRE

850

1766

366

2000

1400

1400

850

2850

2000

6@300=1800

600

150030

ROPE END BRACKETEND POST100

SUPPORT

3000

CABLE(WIRE ROPE)

100

END POST[MOUNTAIN SIDE]

200

4ROCK FENCEBASEPLATE TYPE ROCK FENCE
It is most suitable for replacement due to rockfall deformation,
damage or aging or to the existing retaining wall top end.

CHARACTERISTICS OF BASEPLATE TYPE ROCK FENCE

1 Concrete Foundation Work is Unnecessary.

Since anchors are fixed to existing retaining walls or stable rock masses,
large-scale retaining wall construction and excavation are unnecessary.

2 Excellent Workability.

By fixing the Posts with anchor bolts, large-scale tools and equipment
are unnecessary and can be construct easily in a short period of time.

3 High Impact Resistance is Secured.

Construction on existing retaining walls

By adopting an anchor that can withstand the load until thesupport is plastically deformed, it exhibits the same performance asa normal embedded type ROCK FENCE.

4 Construction is Possible Even in Slopes.

It is possible to manufacture a baseplate type support post adapted
to the gradient of the construction point, even if the retaining walletc. is inclined.

Construction on slopes

POST

ANCHOR
BOLT

EXISTING
CONCRETE
FOUNDATION

5

PROCEDURE FOR REPLACING THE POST
Anchor Bolt
Anchor Hole

Existing Post

Mortarthe foundation around the
1 Drillpole and cut the Post at a positionmortar at the drilled point
2 Fillandthepierce
the four Anchor Holes.

lower than the foundation.

Baseprate
TypePostCementCapsulethe Cement Capsule and3 Insert
push it while stirring with theAnchor Bolt.

the Baseplate Type Post and4 Installtighten and fix the nut.

MODEL/SPECIFICATIONMODELFENCEHEIGHT

WIRE NETTING
(mm )

(m)

RF-5-BP

1.5

RF-7-BP

2.0

RF-8-BP

2.5

RF-10-BP

3.0

MATERIAL CROSS SECTION (mm )POST
SPACING

END POSTMIDDLE POST(m)POST

H-150×150×7×10
3.2φ×50×50

H-200×100×5.5×8

3.0

NUMBER USED on SPACE KEEPER*

H-175×175×7.5×11
H-200×200×8×12
H-200×200×8×12

MATERIAL DIMENSION(m)

MAIN SUPPORT［-100×50×5×7.5［-100×50×5×7.5［-150×75×4.5［-150×75×4.5

Material-A
4.5t×65×680
Material-B
4.5t×65×980

AB

22213

*Number Used Per Place

Please contact the person in charge in case of fence height exceeding 3.0 m.

RF-7BP STRUCTURE
934[ROAD SIDE]
400
400

150

450
350

225

300

400

400
300

[MOUNTAIN SIDE]3000

END POST

1500

H-175×175×7.5×11-1975
25t×400×400

3000
1500

ROPE END BRACKET
25φ×500

BIND WIRE
CABLE(WIRE ROPE) Center from Post to Space Keeper
3×7 18φ@3000
MIDDLE POST
H-200×100×5.5×8-1975
25t×400×400

SUPPORT
2[-100×50×5×7.5-1997
2-25t×150×450

4.0φ WIRE

25

1400

2000

600

4.0φ WIREWIRE NETTING
3.2φ×50×50

1400300

1034

350

200

U-BOLT
M12×40×60
U-BOLT
M10×30×60

ANCHOR BOLT
D25(M24)×750
SPACE KEEPER
2-4.5t×65×980
2006

ROCK GUARD®

CHARACTERISTICS OF THE ROCK GUARD

1 Excellent Capability of Absorbing Rockfall Energy.

By strengthening the Posts, it mainly absorbs rockfall energy withWire Netting and cable. Therefore, the absorbable energy
increased. For absorbable energy, refer to the technical data.

2 Increased Post Spacing and Set Auxiliary Middle Post.

We increased the span between the standard posts to 6m andprovided an Auxiliary Middle Post not fixed to the foundation at
the center of the standard post to reduce the probability of therock fall hitting directly and reduce the external force to the post.

BRG-25

3 The Cable is Connected with Space Keeper.

Space Keeper prevents "slip through" phenomenon in which cablespreads by rockfalls.

Post Deformation would Occur Within the4 No
Reference Fence Length
In the basic design, the post strength is set based on the fence
length of 30m. Within that range the post would not deform. Also,
even if it is longer than the standard fence length, the deformationof the pillar is small.

BRG-35

BRG-25

7

MODEL/SPECIFICATION
MODEL

BRG-15, BRG-20, BRG-25, BRG-30

FENCE HEIGHT(m)1.5～3.0

POST SPACING(m)6.0

CABLE(WIRE ROPE)

3×7 G/O 18φ (Conforming to JIS G 3525)

WIRE NETTING

Chain link wire netting 4.0φ×50×50 (Conforming to JIS G 3552) Z-GS4

Break load：160kN

MIDDLE POST / AUXILIARY MIDDLE POST

Rolled Structural Steel (SS400) (JIS G 3101)

END POST

Rolled Structural Steel (SS400) (JIS G 3101)
Structural Steel Pipe (STKR400) (JIS G 3466)

SPACE KEEPER

Material-A:4.5t×65×680 Material-B：4.5t×65×980
Structural Steel (SS400) (JIS G 3101)

U-BOLT

M12×40×60

ROPE END BRACKET

25φ×500

MODEL

FENCE
HEIGHT

Strength: 160 kN or more

NUMBER USEDonSPACE KEEPER*

MATERIAL CROSS SECTION (mm )NUMBER of
CABLE

END POST(m)（PCS）

MIDDLE POST

AUXILIARY
MIDDLE POST

POST

MAIN SUPPORTA

BRG-15

1.55

H-175×175×7.5×11

L-75×75×9□-175×175×6[-100×50×5×7.52

BRG-202.07H-200×200×8×12

L-75×75×9□-200×200×6[-125×65×6×8

BRG-25

2.58

L-75×75×9□-200×200×6[-125×65×6×8

BRG-303.010

L-75×75×9□-200×200×6[-150×75×6.5×10

H-200×200×8×12(With Reinforcement Plate)

H-350×175×7×11

Please contact the person in charge if the fence height exceeds 3.0 m.

B

2213

*Number Used Per Place

BRG-20 STRUCTURE[ROAD SIDE][MOUNTAIN SIDE]CABLE(WIRE ROPE)

CAP

END POST

1500

SPACE
KEEPERU-BOLT

1500

1500

AUXILIARY
MIDDLE POST

BIND
WIRE

MIDDLE POST
MIDDLEPOST

U-BOLT2000
3000
1620

U-BOLTU-BOLTU-BOLTSUPPORT(2)SUPPORT(3)WIRE
NETTING

1000
301116

583

2000

2000
665665

3000

1000

100

6@300=1800

670

100

ROPE END BRACKET

N@6000

6000
1500

30

END POSTSUPPORT(1)4.0φ WIRE

8TECHNICAL DATAPRECAUTIONS ON CONSTRUCTION
In order to fully demonstrate the rockfall prevention function of the Rock Fence and the Rock Guard, plan with the following
points in mind.
Step 1｜Post Installation

Step 3｜Wire Netting Installation

END POST
Install so that the support faces inside of fence.

Thread the round bar at the end of one Wire Netting, fix it to theEnd Post with the angle U-Bolts.

MIDDLE POST
Set U-bolt mounting hole facing the mountain side.
When installing in the slope, pay attention to the hole position ofthe U-bolt fixing the 4φWire and install it so that the hole will not
be buried.

Pass the 4.0φwire through the other rope end and secure withangle U-Bolts.

Step 2｜Cable installation

Step 4｜Space Keeper Installation

Cut the cable to a specified length and attach the Rope EndBracket to the end. Refer to the example below for the installation
method of the Rope End bracket.

Mount the spacing material from the roadside at the center
between each Post and secure it to the Cable with U-Bolts
inserted from the mountainside.

Mount and fix the Rope End Bracket to the End Post. For
introduction of initial tension at this time, refer to the explanation
below.

Bundle the Cable and Wire Netting with a Bind Wire basically atintervals of 1.5 m (0.75 m at the end) according to the Postspacing.

Pass the 4.0φwire through the upper and lower ends of the Wire
Netting, and fix the End Post to the U-Bolts at the corners.

After fixing both cables, fix them with U-Bolts to each Middle
Posts.

Examples of Rope End Blacket fitting installation

GOOD
SAMPLEBADSAMPLE

Detailed View of End Post Installation PartSQUARE U-BOLT

ROPE END BLACKETWIRE NETTINGNETTING END BAR

9On Initial Tension of Cable
In "Rockfall Countermeasure Handbook", the initial tension of the Cable used
for the falling roof protection fence is set to TO = 5 kN, but this value is ameasure to ensure that the fence surface is formed without sagging on theCable, and it does not necessarily require TO = 5 kN or more as initial tension.
When initial tension is set to 5 kN or more, the available energy absorption
becomes slightly small.
The initial tension is targeted 3 to 5 kN, and do not become excessive above
this.
When the initial tension is 3 to 5 kN, the drooping amount when loading a
mass of 60 kg to the center with respect to the spacing of 3.0 m is about 15 to
9 cm, so please refer to this.

S. Shield

With its newly designed cushioning
mechanism, it protects rockfalls fromslope intelligently. Rope mounting
ring at the terminal pole slides whileabsorbing collision energy.

PractfenceThis is a universal-type small rock fall guard fence,
offering cost efficiency, workability, and ease ofmaintenance. It enables environment-friendly,
economical rock fall protection by being optimallyplaced to suit the slope topography without using
concrete foundations (which destabilize the slope)or scaffolding (which increases construction time).

10

TOKYO ROPE MFG. CO., LTD.
TOKYO ROPE MFG. CO., LTD.
NIHONBASHI FRONT BLDG. 6-2 NIHONBASHI 3-CHOME CHUO-KU TOKYO 103-8306 JAPANTel.: + 81 3 6366 7789, 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
http://www.tokyorope.co.jp/english
1802-AVN-EN