Underground Expansion Shell

The Underground expansion shell holds in any rock strata which is sufficiently competent to provide an adequate anchorage. They are designed to anchor in soft ground or hard rock. In good strata, the anchorage exceeds the ultimate strength of the steel bolt. All expansion shells require a competent strata in the anchor zone.

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Product Description

The suitability of the anchorage and the specific expansion shell to be used is best determined by physical load testing. The Underground expansion shells feature parallel contact with the hole wall with sharp serrations on the outside leaves ensuring positive holding power. The underground expansion shell assembly is securely held by a strong protective sleeve, to save installation time and prevent loss of parts while handling. The sleeve must be removed prior to installation. Corrosion protection may be provided by hot dip galvanizing or zinc plated.

Product Name: Underground Expansion Shell

Material: carbon steel for Expansion Shell, cast iron for Rock anchor bolts

Size:32mm, 35mm, 38mm, 42mm, 48mm

Process: Forging for Expansion Shell, casting for Rock anchor bolts

Application: Rock anchor used in sound rock or concrete allows one-sided forming of walls

Process: Forging for Expansion Shell, casting for Rock anchor bolts

Weight:0.3-0.6KG etc.

Production Process

Machining Workshop

We have full set line of machining facilities, various CNC equipment and Machining Center can meet customers’ requirements. After machining, the casting parts will be completed. Then, they will be inspected and packed for delivery and shipment.

Quality Control

Checking the raw material after they reach our factory------- Incoming quality control

Checking the details before the production line operated

Have full inspection and routing inspection during mass production---In process quality control

Checking the goods after they are finished---- Final quality control

Checking the goods after they are finished-----Outgoing quality control

Packing and Delivery

Packaging of Underground Expansion Shell can be customized based on customer requirements to meet the different needs, such as plastic bag, carton box, wooden case, crate, etc.