海外用リーフレット／フリーフレーム工法
57期 A3 天地297ミリ×左右210ミリ

SHOTCRETE GRID BEAM-FREE FRAME              Shotcrete grid beams are widely applied in Japan to prevent slip failure of slopes. Unstable slopes are
effectively stabilized by concrete grid beams with a ground anchor or soil nail installed at the intersectionof beams. Free Frame Method is a typical grid beam construction method characterized by uniqueformwork made of wire net, called Free Form, and shotcrete-based installation technique. Reinforcing bars
and the formwork units are assembled on slope and mortar or concrete is sprayed. The wire net formwork
also serves as a part of reinforcement. This system enables the grid beam to be installed at height on slope.

Applications(1) Protect and stabilize slopes(2) Prevent collapse of steep slopes(3) Reinforce open-cut ground(4) Reinforce and repair existing structures(5) Reinforce levees(6) Revegetate soilless slopes                         

Advantages
 Product is continuous and durable due to castin-pace installation.

 Product is attached tightly to the slope surface        Wby blasting energy of shotcrete and therefore
provides high earthquake resistance.

 Free Form, a special formwork unit serving as a    

beams on undulated surfaces.

 

! "     #         $ Quality product. Rebound of shotcrete, which

causes product deficiency, is effectively blownout of openings of Free Form.

100 100
90 90
80 80
70 7060 60
50 50
40 40
30 30
20 20
10 10

 No need to pour foundation slab
 Ground anchor or soil nail can be installed at!

the beam intersection

 Applicable to slope greening on soilless slopes.

Various fill materials such as organic soil,
vegetation base materials, or sand bags, areinstalled inside the areas of the grid beams torevegetate soilless slopes.



100 100
90 90
80 80
70 70
60 60
50 50
40 40
30 30
20 20
10 10



  #%

mold and reinforcement, is finally incorporated
in the product as a part of reinforcement. Noneed to remove it later.

 Free Form enables construction of continuous     

FREE FRAME
Shotcreting
Wet mortar or concrete is delivered bycompressed air through high-pressure hoses toan installation point on slope. The material isthen blasted onto the surface and compacted
itself by the energy of high velocity materials  
(%( 4    
(%( 4

6) '(&5 () ) &(**5 () ) &(**7 8 % % * 9( : ;;)(; (1 %%Standard configuration of equipment
5 () ! ( ;;)(; (* )*( ;;)(; (*< , *( : , ,)(( % 8=

 %.
4,)((% , ((%( 6( () )%.)(**)

Wide-range Application and Reliable Construction    !" #$% & #%%  '" (Slope greening is often desired to apply to road-side cut slopes as protection from surface
erosion and weathering. Revegetated slopes harmonize with the surrounding area, improvelandscaping, and prevent car noises from echoing. Shotcrete grid beams with a small section(150mm to 300mm square) are used for this purpose. As vegetation base, sand bags may beinstalled inside the area of grid beams on the slopes less than 45 degrees (1:1.0) in gradient. If
the gradient is steeper than this, it is desired to spray specially-mixed vegetation base materials
using the same shotcrete equipment.

   !" #%% & #)%%  * (  +',
Whether a slope is stable or not can generally be determined from its geological features, rockquality, slope gradient, groundwater conditions and effluent treatment. Although the slope itself
stands stable in general, the following risks still remain especially for long or weathered slopes:
Potentiality of partial collapse due to unconformities
Potentiality of surface failure
The shotcrete grid beams with a 200 to 400mm square section are installed to protect from partial
collapse and surface failure as well as to serve as a foundation of replanting.

••   !" #)%% & #$%% -* . * /''
The grid beams with a larger section (a square of 400 to 500mm or more) are installed withground anchors to stabilize cut slopes or to prevent moderate-scale landslides. The installationof the shotcrete grid beams is a suitable measure to prevent landslides because the blastingenergy of shotcrete ensures a tight contact of beam with the slope surface. Inside the area ofgrid beams is often covered with sprayed mortar or concrete.

           
   !" #$% & '()*( *+) ,-. /0 .122333) ,-.

2006.066006