"Anchor system" plant manufactures and sells following anchor types:

Anchor type, mm Bearing capacity, kN
Atlant 30×8 260
Atlant 42×8 470
Atlant 42×10 553
Atlant 57×6 576
Atlant 57×8 727
Atlant 57×10 856
Atlant 73×8 1050
Atlant 73×11 1285
Atlant 93×13 1942
Anchor System Drill Bit

Always in stock in Russia more then 30 000m different typical sizes.

ATLANT technology is successfully applied in industrial, civil, transport and hydrotechnical construction for installation of self-drilling anchors and piles. It provides a rapid, efficient method of installing tie back anchors in one step.

The main feature of ATLANT technology is combination of drilling and injection. Drill rod utilization as grouting conduit for filling the annulus from the bottom-up guarantees a positive complete filling of the annulus as well as all fissures and cracks. Grout injection continually scours and flushes the sides of the well enhancing mechanical connection to the soil. Cement sheath provides corrosion protection of the drill rod. ATU\NT anchors or piles length is determined in accordance with project for providing required bearing capacity.

We choose a high quality structural steel for ATLANT anchors manufacturing. This steel is not affected by hydrogen embrittlement, wich provides a life span of 50 years and more for permanent anchors.The deep external ATLANT thread ensures a stong bond between drill rod and surrounding soil.

Type Rod diam., mm Wall thickness, mm Yield point, MPa Breaking point, MPa Bearing capacity, kN Ultimate load, kN
30×8 30 8 470 590 260 326
42×8 42 8 550 690 470 590
42×10 42 10 550 690 553 694
57×6 57 6 600 790 576 759
57×8 57 8 590 790 727 973
57×10 57 10 580 790 856 1166
73×9 73 9 580 790 1050 1430
73×11 73 11 600 790 1285 1692
95×13 95 13 580 790 1942 2646

Installation technology

Step 1. Well drilling

1.1. ATLANT anchor piles instalation is made by consequent rods drilling into the soil at the designed angle. Drill rods are use as anchor tie back or compression pile element. Continuous ATLANT thread guarantee the rod can be cut or coupled anywhere along its length.

  • Drill feeding speed into the soil – 0.5 m/min.;
  • Drill rod rotation speed – 50 rpm;
  • Flushing grout Water:Cement ratio – 1.0.

No temporary casing needs!

1.2. For grout preparation should be applied proper quality cement and water. Water should not contain impurities which may cause the metal corrosion and prevent the cement solidification.

1.3. Drilling should be performed only upon condition that grout returning and pulp lifting. If grout returninig stops it is necessary to reduce rod feeding speed or suspend feeding without rotation stopping. It is possible to continue drilling only after resumption of the grout returning.

1.4. Drilling and rod coupling is performed by drill rig.

1.5. It is required to leave out some part of the last rod for testing and construction fastening.

Step 2. Well pressure check

2.1. After reaching the design depth begins the dense grout injection.

  • Drill rod rotation speed – 20-30 rpm;
  • Flushing grout Water:Cement ratio – 0.4.

2.2. The interval between drilling and injection should not exceed one hour, otherwise there will be a solidification of drill cuttings. This will lead to in the cement sheath and anchor bearing capacity reduction.

2.3. ATLANT rod is used as conduit for injection. Grout output is provides by orifices in one-time-use drill bits.

2.4. Dynamic pressure check for filling the annulus from the bottom-up guarantees a positive complete filling of the annulus as well as all fissures and cracks.

2.5. Pressure check is performed before injection grout returning.

2.6. In case there is no rinjection grout returning needs repeat pressure check in 15-30 min. Drill rod should be left in the well.

2.7. Flow rate at dynamic pressure check should account to 50-60 I per 1 r.m. anchor length (depending of drill bit diameter).

2.8. Drill rod should be used as anchor tie or compression pile member.

2.9 Atlant anchors fastening is allowed to start in 14 days after its installation.

No tension need!

ATLANT ground anchors

Equipment, required for installation of AtlantJet anchor piles include a drill rig, high pressure pump and mixing plant.

FIGARO drill rigs

Compact drill rigs sgaro are designed with separate hydraulic unit and developed for soil anchors and piles installation.

Rotary heads with high torque ensure high productivity of the rigs. Rigs Figaro Maschine can be mount on crawlers. Hydraulic stations depending on operating conditions are supplied with diesel, electric or pneumatic drive.

The 3-wheeled drill rig Figaro Pauk was designed for use on steep slopes and embankments. This allows drilling to be carried out with low machine weights and in difficult and dangerous on-site conditions.

Drill Figaro Lafette

Drill Lafette is used for underground construction works:

  • Installation of augercast piles;
  • Reinforcement of buildings foundations;
  • Jet-grouting;
  • Installation of anchors.

Figaro Lafette is intended to work with hydraulic excavator of over 18-t weight.

MINI mixing/injection unit

MINI unit is designed for cement grout preparation and injection.

MINI unit consists of Mixing plant MINI and grout pump GP-40.

Hydraulic scheme of the pump allows to control grout flow rate and grout pressure. Low pressure mode allows achieve max. flow rate of 40 l/min at pressure of 4 MPa.The unit can be equipped with weighting terminal which allows automatic load of components according to set weight ratio.

Generalized Kranz's force equilibrium method for stability analysis of an anchored wall

The polygon of forces acting on the soil wedge at limit equilibrium involves the active earth pressure of the retained soil Pa, the shearing resistance of the soil (i.e., Sс and , and the wall reaction Pa. The polygon of forces acting on the structural wall element involves the soil pressure PA. The resisting prestress anchor load required to maintain equilibrium, the passive resistance of the foundation soil Pp, and the basal soil reaction Fb. The decision power of the polygon allows you to define the horizontal projection Pa bearing capacity of the anchor, which leads hatched the prism in a state of marginal stability.

Kranz equation is used to define the factor of safety

FS = RL/Rm  with  RL =Fand Rm = T.

Bearing capacity calculation

Anchors and piles bearing capacity according DIN 1054-2005:

Fd = π D lqsk  with  D = dw kd

dw – well diameter,

kd – anchor diameter enhancement factor,

lk – anchor root length,

qsk – anchor skin friction.

Recommended values of anchor diameter enhancement factor shown in Table:

Soil type

Enhancement factor kd

Gravel

2,0

Sand

1,5

Sandy clay, clay loam

1,4

Clay

1,3

Rock

1,0

In the Table below you can see calculated skin friction values

Soil type

Skin friction, qsk, kPa

Medium and coarse gravel

200

Sand, semigravel

150

Sandy clay, clay loam, clay

100