r ø e n d d n cts® - con-tech systems · 2019-10-24 · ~ 1:10 step 4: drill down the complete...

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Backflow Preventer System

For CTS®/ IBO® Hollow Bars

CTS®

The CTS® Preventer is used to install micropiles and tie-back anchors in areas

where water ingress is a distinct possibly, for example in existing or new

basements and underground structures.

By using the Preventer system, dewatering is often not required.

Features and benefits• Allows the installation of micropiles and tie back

anchors without the need for dewatering

• Safe, controlled and efficient installation• Economical installation, when compared to

dewatering

• Simple operating procedures

Typical applications

• Tension micropiles to resist uplift

• Tie-back anchors for secant piled walls,

diaphragm walls and sheet piled walls

• Compression micropiles

Description

The Preventer system is essentially a valve system that is connected to a compressor via an airline. The

system is operated by opening and closed the rubber insert, by applying air pressure to inflate and deflate the rubber insert. When the rubber insert is in the “closed” (inflated) position, it restricts the ingress of water, whilst pressing tight against the micropile/anchor, allowing the installation and grouting to be completed,

The Preventer is fixed securely to the structure prior to commencing the installation. It is removed once the grout has completely cured, exposing the top of the micropile/anchor ready for the head detail to be constructed.

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ID

OD

Bar Size

CTS® IBO®

Up to T52

T73 & T103

Type

DN150

DN250

ID

mm

145

250

OD

mm

285

395

L

mm

420

610

Tk

mm

240

350

P max

bar

6

3

Weight

kg

17.5

55

Max Drill bit

mm

130

220

Product Specification

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Securing of an Excavation in Vancouver, BC

CTS® Preventer System for Tie-back Anchors

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Typical Excavation Support

Closed Preventer Valve

Geotechnical seminar „Installation & Design“ – 10.+ 11.02.2016

Excavation dimensions:

100 x 16 x 26 m

Picture from week 12, 2015

(13 m depth)

Bored pile wall

Tie-backing approx. 7 m

below ground water table

Installation of IBO® T52/26

incl. Preventer System

Piles length is between 14 – 22 m

Approx. 3000 lm

Soil conditions:

Sand and gravel + weathered rock


CTS®

Step 1: Core drilling Ø 200 mm

Step 2: Insert flange tube, Tension and pressure resistant, leak proof!

flange tube (with head plate) tube Ø 168,3 mm flange Ø 285 mm

Cement Grout


Step 3: Mount preventer

8 x Bolt M20x80 per flange connection

for additional safety eventually use of second preventer

Compressed air max. 6 bar

open closed

Preventer flange: Ø 285 mm inner diameter: 145 mm (special rubber sleeve)

1 x Flange seal DN 150

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CTS® Preventer System Installation Steps


CTS®

Step 4: Drill down the complete micropile IBO® T52/26 Drill with sufficient drill bit through the concrete, afterwards change Drill bit (to e.g. clay bit) if required Open and close the preventer for flushing

Advice: Do not bear the drill rig against the preventer!

Preventer-pressure should be chosen that to allow some backflow to disappear; approx. 0,5 bar above pressure of ground water


CTS®

Step 5: Drilling down the micropile IBO® T52/26 to final depth by using a recoverable extension (CTS® hollow bar with coupling). Loosen the CTS® hollow bar which is inside the preventer and flush with water to clean the preventer. Grease the last section of the CTS® hollow bar which is available for the pile head before installation.

grease

last section

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CTS® Preventer System Installation Steps


Step 6: Close the preventer with a blind flange Ø285 mm. After curing of the cement, the compressed air of the preventer can be released. Or use our patented rubber stop for immediatere-use of the preventer.



Blank flange DN 150


Step 7: The head construction can be fixed after the cement suspension is fully cured.

Head plate

Spherical collar nut


1.) Application – Information: Insert flange tube, tension and pressure resistant, leak proof!

Cement Grout

Prohibited: Leaky inserted flange pipe or incomplete seat of the flange head plate

2.) Application - Information: If there is doubt whether the flange tube is inserted tightly? So a leak test must be carried out!



1 x Blank flange DN 150 with hose connection

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CTS® Preventer System Important Information


3.) Application - Information: Preventer Valve

The hand lever valve is connected by a pneumatic hose onto the preventer valve. The preventer valve is supplied

with air pressure of max. 6 bar. Connection plug Quick-release valve

Air pressure

Control: To adjust the pressure

Hand lever valve, 2 positions: Open / Close

Pressure gauge: Show preventer pressure


4.) Application – Information: Use fully functioning preventer valves only. The use of inoperable preventer valves is prohibited!

The special rubber sleeve will wear during his use (19 mm wall thickness), if more than half is worn

or if it is damaged or cracked, it must be replaced!

Spare rubber seal is available.

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5.) Application - Saftey indication: Do not reach into the preventer!

6.) Setting for drilling: The preventer pressure has to be setted. A light reflux has to be available. During the drilling the preventer has to be opened and closed for flushing.

Control: To adjust the pressure

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7.) Setting for drilling: The preventer pressure has to be setted.A light reflux has to be available. Replace spilled ground through thickflushing suspension. Cement

Cement

8.) Setting for drilling: If the Preventer pressure is too high, the rubber sleeve will wear before maturity!

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9.) Setting during drilling: If the preventer pressure is too low, material will flush out and it comes to soil erosion.

This must be avoided at all costs!

10.) Error: In case of failure, such as if the preventer can not be controlled anymore and material will flow out uncontrolled, the outflow is to stop immediately by mounting a blank flange. Or install the patented rubber stop.The preventer can now be removed and serviced.

8 x Bolt M20 x 80 per flange connection


Blank flange DN 150

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Protection against uplift TITAN 73 + 103 by using TITAN Preventer System

-

!/ �! IBO® T73 IBO® T103

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Micropiles against uplift CTS® / IBO® T73+T103

Excavation pit

concrete slab t = 0,50m (0,75 m)

0.5

0 m

~ 1:10

0.6

0 m

Step 1: Core drilling Ø 200 mm approx. 0,40 m deep

Step 2: Insert flange tube, Tension and pressure resistant, leak proof!

Flange tube (with head plate) tube Ø 273 mm flange Ø 395 mm length: 600 mm

Cement Grout

Preventer Flange: Ø 395 mm Inside: Ø 250 mm

(Special Rubber Sleeve)

12x Bolt M20 Each Flange Connection

1x Flange Seal DN 250 Each Flange Connection

Flange Tube (with Head Plate) Tube: Ø 273 mm

Flange: Ø 395 mm Height: 600 mm

0.5

0 m

~ 1:10

Step 3: Mount preventer

Cement Grout

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CTS®/ IBO® T73 + T103 Installation Steps

0.5

0 m

~ 1:10

Step 4: Drill down the complete micropile. Drill with sufficient drill bit through the concrete, afterwards change Drill bit (to e.g. clay bit) if required. Open and close the preventer for

flushing

Advice: Do not bear the drill rig against the preventer!

0.5

0 m

~ 1:10

Step 5: Drilling down the micropile to final depth by using a recoverable extension (CTS® hollow bar with coupling). Loosen the CTS® hollow bar which is inside the preventer and flush with water to clean the preventer. Grease the last section of the CTS® hollow bar which is available for the pile head before installation.

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CTS®/ IBO® T73 + T103 Installation Steps

0.5

0 m

~ 1:10

Step 6: Close the preventer with a blind flange. After curing of the cement, the compressed air of the preventer can be released. Or install the patented rubber stop for immediate re-use of the preventer.

0.5

0 m

~ 1:10

Head plate Ø 395x50 mm

Spherical Collar Nut

Step 7: The head construction can be fixed after the cement suspension is fully cured.

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TITAN IBO® T73 + T103 Installation Steps

Version: May 2019

CON-TECH HEAD OFFICE

DELTA, BC CANADA

Sept 8

Memberships:

Head Office: Sales & Production:• 8150 River Road,

Delta, B.C., Canada, V4G 1B5Tel: 604-946-5571

Toll Free: 1-888-818-4826Email: [email protected]

Eastern Locations: Sales & Production: • Brockville, ON, Canada

Tel: 613-342-0041• Charlotte, NC, USA Tel:

Tel: 704-494-3989


Western Locations: Sales & Production Plant:• 3736 South Tacoma Way,

Tacoma, WA, 98409, USATel: 253-237-9008


r ø e n d d n cts® - con-tech systems · 2019-10-24 · ~ 1:10 step 4: drill down the complete...

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