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Камнепады, обвалы, осыпи - Wookey Hole Catch Net 2015

Wookey Hole Catch Net

Камнепады, обвалы, осыпи - Wookey Hole Catch Net 2015

Rope Access Contractor placing bolts prior to the installation. The clock to be caught is to the left of the contractor.

Камнепады, обвалы, осыпи - Wookey Hole Catch Net 2015

Installation of the transmission ropes.

Камнепады, обвалы, осыпи - Wookey Hole Catch Net 2015

Four anchors drawn together and connected to U-brake

Камнепады, обвалы, осыпи - Wookey Hole Catch Net 2015

Catch net during construction

 

Длина системы

6 m - 15 m

 

Год установки

2015

Ситуация

Frederick Sherrell Ltd Consulting Engineers approached us to ask, “is it possible to create a horizontal catch net to catch and hold a potentially unstable 10 ton boulder?” The client is Wookey Hole Show caves, they were planning to bore a tunnel from an existing cave to a cave that previously was only accessible to divers. There was a small risk that the vibration from the works could dislodge a 10 ton block in the roof of the currently accessible cave.

To carry out the works all tools, equipment, anchors and all components of the catch net had to be carried into the cave system by hand. A specialty rope access contractor with extensive experience in caves was engaged to assist with installation of the upper and lower access ropes. They first had install bolts for the rope access, before installing the anchors and the catch net. The anchors had to be drilled and installed using hand held equipment so the anchors had to be short enough for easy handling. To add to the complication of using short anchors the bedrock in the cave is a Dolomitic Conglomerate with a mean strength of only 35-40MN/m2. Following pull out tests we discovered that we would be required to design for a max load of 40kN per anchor.

Описание

Geobrugg engineers designed a solution using our ROCCO 12/3/350 ring net to catch the block. Given the requirement to hand-carry and manually winch the net to the roof, we customized the ring net panels to allow for easy maneuverability and easy installation based on the location of the ropes. To take load from any impact Geobrugg installed five transmission ropes across the width of the cave. Geobrugg installed a U300 brake at each end of the ropes. Perimeter ropes were installed to give shape to the net.

Collaborating with the designers at Frederick Sherrell we designed a novel solution for installing suitably safe anchors given the weakness of the rock. In total 14 sets of anchors were installed. The anchors were paired together using wire rope. Two pairs were then attached to the U300 brake at each anchor point.

Upon project completion the contractor commented that the system drawings were clear, Geobrugg's engineer was accessible if there were questions, and the installation was extremely straightforward and far less complicated and time consuming than he had expected. He was impressed with this level of service and drawings that were provided for a custom designed product.

Клиент

Wookey Hole Caves

Проектировщик

Frederick Sherrell Ltd Consulting Engineers

Представитель в Вашем регионе

Roger Moor
   

Roger Moor

Country Manager Ost- und Zentralschweiz, Liechtenstein

Инженерная защита
Гидротехника
Горнодобывающая промышленность / Туннели
Геобругг АГ,Аахштрассе 11,8590 Романсхорн / Швейцария Country Manager Ost- und Zentralschweiz, Liechtenstein

Электронная почта

René Müller
   

René Müller

Country Manager Kantone AG BE BL BS FR GE JU NE SO VD VS

Инженерная защита
Гидротехника
Горнодобывающая промышленность / Туннели
Геобругг АГ,Industriestrasse 21,5200 Brugg / Швейцария Country Manager Kantone AG BE BL BS FR GE JU NE SO VD VS

Электронная почта

Alexander Bittendorfer
   

Alexander Bittendorfer

Project Manager Inspection Services

Инженерная защита
Геобругг АГ,Аахштрассе 11,8590 Романсхорн / Швейцария Project Manager Inspection Services

Электронная почта

Isacco Toffoletto
   

Isacco Toffoletto

Ticino Country Manager

Инженерная защита
Гидротехника
Горнодобывающая промышленность / Туннели
Geobrugg AG Ticino,Stabile Cometal, via Pizzante 7,6595 Riazzino / Швейцария Ticino Country Manager

Электронная почта