ux vx product manual 090619

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© Geobrugg AG, Protection Systems, CH-8590 Romanshorn, Switzerland ROCCO ® Debris flow barriers Proof of quality assurance / verification of conformity Installation manual Input parameters for design ISO 9001 Quality Certificate Proof of load carrying capacity of the system based on one-to-one field tests in cooperation with the WSL, Swiss Federal Institute for Forest, Snow and Landscape Research Edition: 164-N-FO / 02 Date: 19.06.09 Product Manual VX / UX

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UX VX Product Manual

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Page 1: UX VX Product Manual 090619

© Geobrugg AG, Protection Systems, CH-8590 Romanshorn, Switzerland

ROCCO® Debris flow barriers

• Proof of quality assurance / verification of conformity

• Installation manual

• Input parameters for design

• ISO 9001 Quality Certificate

Proof of load carrying capacity of the system based on one-to-one field tests in cooperation with the WSL, Swiss Federal Institute for Forest, Snow and Landscape Research

Edition: 164-N-FO / 02 Date: 19.06.09

Product Manual VX / UX

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© Geobrugg AG, Protection Systems, CH-8590 Romanshorn, Switzerland 164-N-FO / 02

Purpose and organization of the manual

This product manual ensures that Geobrugg debris flow protection systems are manufactured free from defects in accordance with the latest technology and that the range of applications is clearly defined, the functional efficiency is given, and the installation of the system is professionally carried out and controlled. The product manual is devided in the following sections: • Proof of quality assurance / verification of conformity • Classification of debris flow barrier systems • Installation manual • Input parameter for barrier design • ISO 9001 Quality Certificate No claims are made that this document is complete. The manual describes standard applications and does not take into account project-specific parameters. Geobrugg cannot be held liable for any extra costs that may be incurred for special cases. In case of uncertainties, please contact the manufacturer. The General Sales Conditions of Geobrugg AG are applicable.

Responsible for the content of this manual:

Geobrugg AG Aachstrasse 11 Postfach CH-8590 Romanshorn/Switzerland Tel. ++41-71-466 81 55 Fax. ++41-71-466 81 50 e-mail [email protected] Romanshorn, June 2009

(stamp / authorized signatures)

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I Range of application

The design of debris flow protection systems is based on detailed investigations by specialized engineer-ing firms, particularly taking into account the following geotechnical aspects to define the range of possi-ble applications:

• Former debris flow events

• Catchment area (condition of soil, inclination, size)

• Estimated rainfall intensity

• Debris flow input parameter (volume of decisive surge and total volume, density, middle front veloc-ity)

• Composition of debris flow (debris fraction, water content, density)

• Probability of occurrence

• Calculation of decisive load cases

• Barrier location (Consideration of local topography)

• Anchorage conditions II Quality of the system components

Geobrugg AG, the former Geobrugg Protection Systems Divison of Fatzer AG, Romanshorn has been certified since August 22nd 1995 under the registration no. 34372 in accordance with the Quality Man-agement Systems Requirements (ISO 9001, 2000, revised 2007). The certifying body is the Swiss Asso-ciation for Quality and Management Systems (SQS), which belongs to EQ-Net 9000. The quality manual completely specifies how to test the system components (raw material, commercial and end products) comprehensively in order to exclude deficiencies in quality. The relevant certificates are attached as ap-pendices. III Functional efficiency of the barrier systems

The functional efficiency of the system is based on one-to-one field tests at the Illgraben test site (Canton VS, Switzerland).The tested barriers could retain a volume of 750 m3 in 2005 and 1'000 m3 in 2006 and were overtopped with several debris flows with more than 10.000 m3 of material. Important input parame-ters could be measured like debris flow velocity, density, flow height and impact forces and helped to develop a full design concept. IV Quality control for installation This product manual describes in detail the different steps for installation of the barriers. These steps must be faithfully followed by local building contractors.

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V Product liability

Rockfall, landslides, debris flows or avalanches are sporadic and unpredictable. Causes can be e.g. hu-man (construction, etc.) or environmental (weather, earthquakes, etc.). Due to the multiplicity of factors affecting such events it is not and cannot be an exact science that guarantees the safety of individuals and property. However, by the application of sound engineering principles to a predictable range of parameters and by the implementation of correctly designed protection measures in identified risk areas the risks of injury and loss of property can be reduced substantially. Inspection and maintenance of such systems are an absolute requirement to ensure the desired protec-tion level. The system safety can also be impaired by events such as natural disasters, inadequate di-mensioning parameters or failure to use the prescribed standard components, systems and original parts; and/or corrosion (caused by pollution of the environment or other man-made factors as well as other ex-ternal influences). Because of individual sections of debris flow torrents various barrier design and setups are possible. The influence of such adaptations cannot be concretized every time. Critical input parameters are for example span width of the barrier, barrier height, river bed inclination, debris flow volume, flow height and possibil-ity of anchorage. Geobrugg can assist with estimating the influence of larger deviations and special situations, and can offer recommendations for feasible solutions. Geobrugg cannot, however, guarantee the same behavior as in the one-to-one debris flow barrier tests. In critical cases, it is advisable to reinforce particular com-ponents as compared with the standard barrier.

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Contents

1 Introduction .......................................................................................................................................6 1.1 Validity of installation instructions .......................................................................................................6 1.2 Construction ........................................................................................................................................6 1.3 Anchor forces ....................................................................................................................................10

2 Installation of the barrier ................................................................................................................10 2.1 Installation steps of VX - barriers ......................................................................................................10 2.2 Installation steps for UX - barriers.....................................................................................................10 2.3 Recommended installation tools .......................................................................................................12 2.4 Use of wire rope clips........................................................................................................................13

3 Anchorages......................................................................................................................................14 3.1 Marking of the anchorage locations ..................................................................................................14 3.2 Position of the anchors fort he retaining ropes .................................................................................15 3.3 Anchorage of the post foundation .....................................................................................................17 3.4 Post foundation .................................................................................................................................18 3.5 Anchorage of the support and retaining ropes..................................................................................19 3.6 Arrangement of flexible heads ..........................................................................................................20

4 Superstructure.................................................................................................................................21 4.1 Installation of the posts, support and retaining ropes .......................................................................21 4.2 Installation steps for VX - barrier.......................................................................................................25 4.3 Installation of the ring net ..................................................................................................................26 4.4 Installation of the abrasion protection ...............................................................................................28

5 Appendix to the light-system VX060L-H4.....................................................................................29 5.1 Use of wire rope clips........................................................................................................................29 5.2 Ring net installation...........................................................................................................................30 5.3 Neglecting of abrasion protection......................................................................................................30

6 Final inspection...............................................................................................................................31

7 Standard-drawings..........................................................................................................................32

8 Characteristic debris flow parameter for barrier design.............................................................33

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1 Introduction

1.1 Validity of installation instructions

1.2 Construction

The debris flow barrier system consists of the following components:

• Net made of ROCCO®- rings The ROCCO ring net is the main element of the system and consists of high-tensile wire with a tensile strength of 1770 N/mm2 and a diameter of 3 mm. Ring nets with 12 windings are built into the lower intensity standart systems and with 16 windings for the higher intensity standart systems. Because of its design, the net itself can absorb energy through plastic deformation. The ROCCO ring net can be easily adapted to the terrain and is resistant against multiple impacts.

• Support and retaining ropes The job of the support ropes is to transmit the forces occuring in the net over the posts to the anchors. Rope construction according to DIN 3060 / 3064. The ropes are available in galvanized or GEOBRUGG SUPERCOATING quality.

• Abrasion protection The abrasion protection protects the upper support ropes from abrasion if the barrier is completely filled and gets over-topped. It consists of steel angles with welded shackles to fix it on the upper ropes. With shackles the profiles can be linked together and can so deform flexible.

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• Spiral rope anchor

The support and retaining ropes are anchored in the soil or rock by means of Geobrugg spiral rope anchors. Alternative self drilling anchors (for example Typ Titan or IBO) can be use. The spiral rope anchors are equipped with a flexible head, which ensures that forces not working directly in the pulling directioncan also be transmitted. Two galvanized tubes over the anchor head, plus the galvanized spiral rope, provide double corrosion protection.

• Brake rings The task of the built-in Geobrugg brake elements (brake rings) is to dissipate energy via plastic deformation and friction, and to protect the support ropes from overload. The steel tubes also protect the rope from corrosion and mechanical damage.

• Base plate

The base plates are the base for the posts and are either set on a concrete foundation. The concrete foundation is fixed with tension and pressure anchors in the ground of the tor-rent. The posts are hinged on the plates. All elements that come in contact with the ropes are finished without sharp edges to avoid rope damage.

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• Hinged posts The posts have the function to keep the system height after filling the barrier. HEB type steel posts are used. The rope guides at the post head are finished without sharp edges to protect the ropes. The posts are held in position with the help of retaining ropes. The order in which the ropes are ar-ranged on the post head corresponds to the installation se-quence.

• Shackles The connections between the ring net and the ropes are made with shackles. They guarantee that the net can slide on the rope without damaging it. The nets are also con-nected vertically with shackles. In general, the shackles are designed to produce the stronger connection than the net it-self. The shackles can be bonded with adhesive (e.g., with Loctite) if they are required to be theft-proof.

• Wire rope clips The ropes are delivered with pressed loops on one side of the rope. The free end has to be fixed with wire rope clips according to EN 13411-5 (DIN 1142). It is very important to use the right number of wire rope clips with the required torque values. The wire rope clips can be bonded with adhe-sive (e.g., with Loctite) if they are required to be theft-proof.

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• System drawing of the rope guiding for UX/VX systems

The end of the ropes with pressed loops is fixed with shackles at the flexible head of the anchors. On the other side the ropes will be spanned and fixed with wire rope clips according to EN 13411-5. In the same way also the winglet rope is installed. With shackles it is additional fixed to the upper support rope. The border rope is fixed to the flexible head of the winglet rope and will be guided through every flexible head down to the lowest anchorage of the bottom rope and will be fixed with wire rope clips. System drawing VX

System drawing UX

Upper support rope

Bottom support ropes

Border rope

Winglet rope

Middle support rope

Winglet rope

Middle support ropes Upper support ropes

Lower support ropes Posts

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1.3 Anchor forces

The force caused by a debris flow can be very high. Therefore the underground engineering and installa-tion work have to be done precise and accurate. The length of the anchors is based to the measured rope forces of the 1:1 field tests and depending on the quality and soil bearing capacity. The anchor length has to be determined by a regional involved geologist.

2 Installation of the barrier

2.1 Installation steps of VX - barriers

The step by step installation is divided in the following topics. The detailed steps are described in each chapter Preliminary work Chapter 3

• Site preparing • Stake out the anchor positions Foundation construction Chapter 3

• Drilling of the anchors and inject them • Implantation of the stabilization tubes and waiting until the concrete is cured • If self drilling anchors are used, the flexible heads have to be drilled to the anchors Construction of the superstructure Chapter 4

• Fix the upper ropes to the anchors and pull them by a chain hoist or Habegger. Same installation approach has to be done with the winglet rope. Support ropes have not to be tensioned yet.

• Tension the upper support ropes. If there are several ropes hold them together with a shackle. • Tension the winglet ropes. The winglet ropes are fixed with shackles to the upper ropes. • Loop and tension the border ropes • Tension the lower ropes. If there are several ropes hold them together with a shackle. • Clamp the ring net to the upper ropes • Clamp the net to the bottom ropes with shackles • Connect the net fragments together with shackles • Installation of the middle support ropes. If there are several ropes hold them together with a shackle. • Installation of the abrasion protection with a crane, chain hoist or helicopter. It is fixed to the upper

support and the winglet ropes with the welded shackles

2.2 Installation steps for UX - barriers

The step by step installation is divided in the following topics. The detailed steps are described in each chapter. Preliminary work Chapter 3

• Site preparing

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• Stake out the anchor positions Foundation construction Chapter 3

• Drilling of the anchors and inject them • Implantation of the stabilization tubes and waiting until the concrete is cured • If self drilling anchors are used, the flexible heads have to be drilled to the anchors • Construction of the post fundaments • Fix the base plates on the fundaments by screwing Construction of the superstructure Chapter 4

• Fix the upper ropes to the anchors and pull them by a chain hoist or Habegger. Same installation approach has to be done with the winglet rope. Support ropes have not to be tensioned yet.

• Place the posts • Tension the retaining ropes • Tension the upper support ropes. If there are several ropes hold them together with a shackle. • Tension the winglet ropes. The winglet ropes are fixed with shackles to the upper ropes. • Loop and tension the border ropes • Tension the lower ropes. If there are several ropes hold them together with a shackle. • Clamp the ring net to the upper ropes • Clamp the net to the bottom ropes with shackles • Connect the net fragments together with shackles • Installation of the middle support ropes. If there are several ropes hold them together with a shackle. • Installation of the abrasion protection with a crane, chain hoist or helicopter. It is fixed to the upper

support and the winglet ropes with the welded shackles. Installation of the light-system Chapter 5 • Principle drawing of light system • Comparison of light-system with the normal VX/UX-system • Differences in installation

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2.3 Recommended installation tools

The following tools are recommended for marking and installation

M

arki

ng

• tape measure 30 to 50 m

• 2 meter folding rule

• inclinometer

• spray paint

• small wooden or iron pegs

• hammer

• product manual

In

stal

latio

n

• fork or ring wrench SW 22 and 24

• socket wrench with ratchet

• torque wrench SW 22 and 24, range 25-120 Nm (required torque)

• wire rope cutters Felco C16 or C112 or equivalent; cutting capacity 12 mm

• motor disc cutter or hammer wire rope cutter; cutting capacity 28 mm

• pincers, flat nose pliers

• galvanized stranded wire binding cord 2 mm or wire

• angle spirit level (water-level)

• roll of adhesive tape

• draw tongs small 8-16mm / large 14-26mm (at least 2 peaces)

• At least tow tension belts/straps

• Come-along/pulley, e.g., type LUGAL

• Chain hoist or Habegger, at least 3.5 to (35kN)

• auxiliary ropes

Table 1: installation tools

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2.4 Use of wire rope clips

The first wire rope clip is attached close to the thrimble or the loop. The wire rope clips must be spaced so that the distance between them e is a mutilple of 1.5 to 3 times the width of t of the wire rope clip. The clip stirrups („u-bolts“) are always applied on the unstressed rope end, the jaws („saddle“) always on the stressed rope (“Never saddle a dead horse”). Extract from EN 13411-5 (DIN 1142)

Standard size

[mm]

Required torque

[Nm]

Required number of wire

rope clips

Width across

[mm]

22 Geobinex 120.0 10 24 Table 2: Torque values and number of wire rope clips The value of the torque applies to greased screws and nuts. During the installation, tighten the clips with the required torque. After the installation of the whole system, the torque of the fixations of the upslope anchor and support ropes must be checked. (1) The torque in the table is 10% higher than recommended in EN 13411-5 (DIN 1142) to take into account the deviation of common torque wrenches.

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3 Anchorages

3.1 Marking of the anchorage locations

The position of the debris flow barrier has to be fixed by the design engineer. Beneficial are smaller tor-rent sections with stable slopes to anchor the barrier. The maximum span width should not be larger than 25 m and the height of the barrier should not be more than 6 m. The basal opening between the lower support ropes and the river bed should be specified by an expert according to the expected flow height of the debris flow. The range of the basal opening normally lies between 0.5 and 1 m. Anchorage points for the support ropes: The angle between the winglet rope and the upper support ropes should be between 20-25°. This geo-metric effect of the winglet ropes builds an overflow section. The overflow section must be smaller than the span width of the river bed, so the erosion effect of the river banks can be minimized. The anchors of the upper and lower support ropes should be determined that the target height of the bar-rier is full filled. The middle support ropes are fixed in the middle of the section shown in the drawings. The barrier line is normally orthogonal to the flow direction. The barrier should be sloped forward in verti-cal direction max. 5°. The anchorage points have to be determined by marked points with spray paints. Anchorage points for the retaining ropes: The anchors of the retaining ropes have to be fixed behind the posts with an angle between 20° – 40° side wards of the horizontal line. The posts should be inclined max. 5°. The angle bet-ween the retaining ropes and the posts should be 60° - 85° in all cases.

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3.2 Position of the anchors fort he retaining ropes

barrier post

α α

α should be between 20 - 40°

retaining ropes retaining ropes

Flow direction

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5° post inclination

60°-85°

post

retaining rope

15°

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3.3 Anchorage of the post foundation

The reinforced post foundation transfers the horizontal and vertical load from the foundation over the an-chorage to the ground. The post foundation is anchored with one compression anchor and two tension anchors. The compression anchor has to be drilled in vertical direction and the two tension anchors have to be built in 45° to horizontal direction and 10° inclined to the flow direction. To have the optimum load transfer you have to put quadratic steel plates at the end of the anchors and have to fix them with a nut. The connection between the foundation and the base plate is done with two shorter bars built in vertical direction. The base plate has to be installed to these bars having the elon-gated holes valley site. Installation steps:

• Dig out the foundation hole • Drill the anchorage • Shutter the foundation and build in the reinforcement. Put on top the anchor plates. • Build in the two bars for the base plate (Use the base plate as a face mould) • Concrete the foundation. Please round the foundation edges if the border rope is led along the

foundation. • The fastening of nuts may not be tightened until the concrete has cured completely.

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3.4 Post foundation

Sectional view Plan view

Compression anchor (on site)

Tension anchor (on site)

minimum reinforcement 10/100 (on site)

Tension anchors

365

1000

flow direction

flow direction

220

1000

1000

1000

optional with helix reinforcement (on site)

200 45°

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3.5 Anchorage of the support and retaining ropes

The anchors of the support ropes have to be drilled in direction of the support ropes. If several anchors are needed for several ropes at one point, please incline one anchor 15° backwards to the flow direction and arrange it a little bit lower than the first one. The flexible anchor heads must lie as closed as possible to the ground surface to avoid a too large distance between the border rope and the slope. The flexible anchor heads make sure that loads not acting in the anchor line can be transmitted. So after an event only the superstructure has to be re-build and repaired. Installation steps:

• Dig the foundations • Drill the anchors • Put the flexible heads on the anchors if self drilling anchors are used. Shutter and reinforce the

foundation. The flexible heads have to be build in up to the orange marking. The edge of the con-crete foundation has to be rounded because of the border ropes.

• The holes of the shutter around the flexible heads have to be stuffed with polyethylene foam. • Concrete the foundation

Reinforcement 10/100 (on site)

marking of installation depth

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3.6 Arrangement of flexible heads

The loading of the anchors is not in its line direction after an event. They get deformed in vertical and horizontal direction. This means that the anchors have to be installed in this manner that they can deform in these directions. The best way is to incline the flexible heads 45° forward so also the border ropes are installed easily.

Correct inclined flexible heads. The inclination should be circa 45°.

Acting debris flow

Arrangement of flexible heads

Debris flow barrier

45°

45°

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4 Superstructure

4.1 Installation of the posts, support and retaining ropes

Installation step: • Outlay and control the length of retaining and support ropes. • Pull the brake rings to the correct position. The brake rings can be fixed with a small wood

wedge. The position of the brake rings should be closed to the anchors next to the slope. So the brake rings can deform easily.

• Fix and lift the upper support ropes. Please do not tension the ropes yet because the posts still have to be installed. The brake rings should be closed to the anchors next to the slope. If several support ropes are installed, hold them together next to anchors.

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• The posts have to be installed with Helicopter, a crane or excavator and have to be fixed at the base plate. The eyelet for the overturn securing rope has to be on valley site. Put the joint on the foot of the post onto the supporting block. Push the hinge tube through the eyelets of the base plate and through the joint, and secure with two large spring cotters. Afterwards the posts are leaned against the upper support ropes.

Overturn securing rope

Support or border rope

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• Fix the overturning securing rope at the base plate. Please pay attention that the overturning se-curing rope is long enough to put the posts in the right position.

• The retaining ropes are held with a securing rod, which is secured with a small spring cotter. The

brake rings should be one meter away from the post.

• Tension the retaining ropes and pull the posts in the right position.

• Lead the upper support ropes through the head of the post and tension them. If several support ropes exist hold them together with a shackle as closed as possible to the anchors.

Overturning securing rope

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• Align the post in the right position. The post should be inclined 5° in flow direction and 1-2° to the slope site. In no way incline the post to the river bed site.

• Tension the retaining ropes together so that they are pre-stressed in the same way!

• Thread the border ropes through the flexible heads and tension them. The pressed loops should not lie on the concrete founda-tion. Please have a look at the correct number of brake rings and install them in the middle between the anchors of upper and middle or middle and lower ropes.

• Tension the lower ropes. If several support ropes exist hold them together with a shackle as closed as possible to the an-chors.

• Please tension the middle support ropes after the ring net

installation. Very important, the middle support ropes have to be installed at the valley site of the ring net!

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4.2 Installation steps for VX - barrier

Installation steps: • Outlay and control the length of support and border ropes.

• Pull the brake rings to the correct position. The brake rings can be fixed with a small wood

wedge. The position of the brake rings should be closed to the anchors next to the slope. So the brake rings can deform easily.

• Tension the upper support ropes.

• Connect the winglet ropes with shackles to the upper support ropes

• Tension the winglet ropes. If several support ropes exist hold them together with a shackle as closed as possible to the anchors.

• Thread the border ropes through the flexible heads and tension them. The pressed loops should

not lie on the concrete foundation. Please have a look at the correct number of brake rings and install them in the middle between the anchors of upper and middle or middle and lower ropes.

• Tension the lower ropes. If several support ropes exist hold them together with a shackle as

closed as possible to the anchors.

• Please tension the middle support ropes after the ring net installation. Very important is, that the middle support ropes have to be installed at the valley site of the ring net! So they are sure of debris and stones.

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4.3 Installation of the ring net

• Maybe an auxiliary rope or a tension belt is necessary to install the ring net more easily. • The net is easily installed by additional bars led through the second ring range. The bars are fixed

together with the net to the upper support ropes with a helicopter, crane or excavator. Afterwards the first range of rings (normally marked blue) should be connected to the upper support ropes with shackles. Alternatively a secondary rope to install the ring net can be used and led through the second ring range and can be pulled with a chain hoist up to the upper support ropes.

• Remove the bar and disperse the ring net with the help of a chain hoist or a Habegger. Please pay attention, the rings should not deform. The best way is to start with the middle part of ring net and continue with the lateral parts. Please don’t cut the ring net before it is shackled to every rope.

• The nets have to be connected with ¾” shackles in the following way that very ring is connected

with 4 neighbor rings. Except of the border rings next to the support- and border ropes, they have only 3 neighbor rings. Or in other words the rings of each particular main ring line have to be con-nected to one line.

Secondary rope for installation

1" shackles

3/4" shackles

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• After the connection of the ring nets together they should be connected with the lower support and the border ropes. Therefore 1'' shackles should be used.

• The brake rings of the lower support ropes should be fixed flow upwards with wire to the ring net

thus debris cannot block the brake rings with stones.

• Tension the middle ropes and connect them with the ring net with 1” shackles.

Flow direction

!

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4.4 Installation of the abrasion protection

The best way to elevate the single abrasion profile is by an excavator or chain hoist (crane or helicopter). The abrasion profile can installed directly to the upper and winglet (if it exists) support ropes by the welded shackles.

The single profiles should overlap each other. Afterwards they are connected with ¾” shackles through the elongated holes. The overlap area should be as large as possible to allow in case of elongation of the brake rings enough way for the abrasion profile to elongate too. Additionally the abrasion protection is fixed with ¾” shackles to the secondary ring range to avoid torsion of the abrasion protection. Between the posts the abrasion protection has to be connected with a small additional rope and the distance be-tween last abrasion profile and the post should be as small as possible.

Additional rope to install the abrasion protection Additional fixed shackle to avoid torsion

Winglet and upper support ropes

abrasion profile

elongated holes to connect the profiles with shackles

flow direction

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© Geobrugg AG, Protection Systems, CH-8590 Romanshorn, Switzerland 164-N-FO / 02

5 Appendix to the light-system VX060L-H4

This system is specially constructed for small span width and smaller retention volume. Thus no overflow-ing of the filled system is considered. The maximal geometric parameters of this light-system are illus-trated in the next figure by a principal drawing.

The light-system is in principle analog to the normal VX-system. Caused by smaller impact loads neglect-ing the overflowing process and regarding smaller span width, lighter components can be used. This af-fects mainly the applied ring net, ropes and brake elements. The ring net has only seven windings and is so a ROCCO®- 7/3/300 type. The support ropes have only a diameter 20 mm section and lighter brake elements implemented. The following changes in the installation process have to be considered:

5.1 Use of wire rope clips

The first wire rope clip is attached close to the thrimble or the loop. The wire rope clips must be spaced so that the distance between them e is a mutilple of 1.5 to 3 times the width of t of the wire rope clip. The clip stirrups („u-bolts“) are always applied on the unstressed rope end, the jaws („saddle“) always on the stressed rope (“Never saddle a dead horse”). Extract from EN 13411-5 (DIN 1142)

bmax=10 m

bmax=5 m

hmax=4 m

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© Geobrugg AG, Protection Systems, CH-8590 Romanshorn, Switzerland 164-N-FO / 02

Standard size

[mm]

Required torque

[Nm]

Required number of wire

rope clips

Width across

[mm]

22 120.0 5 24 Table 3: Required torque and number of wire rope clips The value of the torque applies to greased screws and nuts. During the installation, tighten the clips with the required torque. After the installation of the whole system, the torque of the fixations of the upslope anchor and support ropes must be checked. (1) The torque in the table is 10% higher than recommended in EN 13411-5 (DIN 1142) to take into account the deviation of common torque wrenches. The installation equipment has to be adapted to the wire rope clips and rope diameter!

5.2 Ring net installation

The ring net is connected to the support- and border ropes with 3/4'' shackles instead of 1'' shackles. Apart from that the installation process is identical than described in chapter 4.3.

5.3 Neglecting of abrasion protection

The installation of the abrasion protection is not described because of neglecting abrasion process by not considering a overflowing process.

t

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© Geobrugg AG, Protection Systems, CH-8590 Romanshorn, Switzerland 164-N-FO / 02

6 Final inspection

After finishing the installation a final inspection by the site engineer is necessary. The following points are necessary to check: a) Are the anchors installed correctly and are the flexible heads in the right position? b) Is the right number of support ropes installed? c) Are the support ropes fixed at the right anchors? d) Is the ring net connected to the support, border and winglet ropes correctly? e) Correct number of brake rings installed? f) Is it possible that the brake rings can elongate without any problems? g) Is the correct number of wire rope clips installed at the ropes? Are the wire rope clips installed in the

correct way? h) Check the required torque and tighten the clips again. i) Are the nets connected correctly? j) Are the shackles bonded with adhesive (e.g., with Loctite) if it’s necessary? k) Does the abrasion protection have enough large overlapping areas to assure sufficient deformation? l) Is the abrasion protection assured with shackles against torsion? m) Are the brake rings of the lower support ropes bend upwards to the ring net?

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© Geobrugg AG, Protection Systems, CH-8590 Romanshorn, Switzerland 164-N-FO / 02

7 Standard-drawings

For the installation work the following system drawings are necessary to consider:

• Type VX080-H4: GD-1001.1e, GD-1001.2e

• Type VX140-H4: GD-1002.1e, GD-1002.2e

• Type VX100-H6: GD-1003.1e, GD-1003.2e

• Type VX160-H6: GD-1004.1e, GD-1004.2e

• Type UX100-H4: GD-1005.1e, GD-1005.2d, GD-1005.3e

• Type UX160-H4: GD-1006.1e, GD-1006.2d, GD-1006.3e

• Type UX120-H6: GD-1007.1e, GD-1007.2d, GD-1007.3e

• Type UX180-H6: GD-1008.1e, GD-1008.2d, GD-1008.3e

• Type VX060L-H4: GD-1009.1e, GD-1002.2e

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8 Characteristic debris flow parameter for barrier design

Project name:…………………………………………………………………… Project no:………………………………………………………………………. Country:……………………………………………………………………………… Installation place:……………………………………………………………………………….. Customer:……………………………………………………………………………. Employer:………………………………………………………………………….. Protected object:………………………………………………………................... Cross section at the barrier Longitudinal profile before the barrier in flow direction

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© Geobrugg AG, Protection Systems, CH-8590 Romanshorn, Switzerland 164-N-FO / 02

Input parameter for dimensioning the flexible debris flow barriers Middle width of the barrier and length of upper support ropes and lower ropes [B]

m

Slope inclination before the barrier in flow direction [S] %

Approx. total debris flow volume [VDF] m3

Type of debris flow

Granular Muddy _________

Density of the expected debris flow [ρd] kg/m3

Additional comments: