A sock anchor unit (10) comprises an inner longitudinal hollow spine (12), an outer fabric sleeve (14) arranged to envelop the outside surface of the inner hollow spine (12) such that a gap is defined between the outside surface of the inner hollow spine (12) and an inner surface of the outer fabric sleeve (14) and a plurality of elongated reinforcing members (22), wherein each elongated reinforcing member (22) extends longitudinally within the gap. The inner hollow spine (12) comprises at least one substantially laterally extending opening from inside to outside of the inner hollow spine (12). The opening allows cementitious fluid which is pumped into the anchor unit to fill the gap between the hollow spine (12) and outer fabric sleeve. A fastening member (28, 32) is provided on each end of the sock anchor unit (10). Both fastening members (28, 32) are compatible with each other and each fastening member (28, 32) is configured such that a trailing end of a first sock anchor unit (10) is attachable to a leading end of a second sock anchor unit (10) thereby facilitating creating a multiple piece sock anchor system of a desired length.

Rock anchors, inflation chucks, and inflation systems such as those described herein, allow for substantially complete draining of fluids from interior volumes of the rock anchors. In various situations, corrosive fluids may be introduced to the rock anchor, including inflating the rock anchors and during normal use, such as by groundwater intrusion. The inflation chucks described herein include multiple inflation paths for more effectively introducing and draining fluid from rock anchors during inflation processes and during general use.

A sock anchor unit (10) comprises an inner longitudinal hollow spine (12), an outer fabric sleeve (14) arranged to envelop the outside surface of the inner hollow spine (12) such that a gap is defined between the outside surface of the inner hollow spine (12) and an inner surface of the outer fabric sleeve (14) and a plurality of elongated reinforcing members (22), wherein each elongated reinforcing member (22) extends longitudinally within the gap.

The inner hollow spine (12) comprises at least one substantially laterally extending opening from inside to outside of the inner hollow spine (12). The opening allows cementitious fluid which is pumped into the anchor unit to fill the gap between the hollow spine (12) and outer fabric sleeve.

A fastening member (28, 32) is provided on each end of the sock anchor unit (10). Both fastening members (28, 32) are compatible with each other and each fastening member (28, 32) is configured such that a trailing end of a first sock anchor unit (10) is attachable to a leading end of a second sock anchor unit (10) thereby facilitating creating a multiple piece sock anchor system of a desired length.

Rock anchors, inflation chucks, and inflation systems such as those described herein, allow for substantially complete draining of fluids from interior volumes of the rock anchors. In various situations, corrosive fluids may be introduced to the rock anchor, including inflating the rock anchors and during normal use, such as by groundwater intrusion. The inflation chucks described herein include multiple inflation paths for more effectively introducing and draining fluid from rock anchors during inflation processes and during general use.

An expandable rock bolt which is formed with a expansion body having a transversal cross section that has a deformed shape which defines at least one lengthwise groove having ends that include caps with a filling component on an inlet side and an end component on an outlet side. The expandable rock bolt is further equipped with at least one indicator of clamping which is formed with a hollow tube which is made of an elastically compressible material and which is placed on a wall of the expansion body along which the indicator is taken out on a visible side for staff whereas at least in a part of an internal cavity of the tube of the indicator is placed an indication medium.

Rock anchors, such as those described herein, allow for substantially complete draining of fluids from interior volumes of the rock anchors. In various situations, corrosive fluids may be introduced to the rock anchor, including inflating the rock anchors and during normal use, such as by groundwater intrusion. The rock anchors described herein include multiple passages for more effectively draining fluid from the rock anchors during inflation processes and during general use.

Provided is a ground reinforcement structure installed on a ground (10) in which a sandy soil layer (11) having a weak surface layer is provided and thus large-caliber excavation is difficult to be performed, the ground reinforcement structure including a ground reinforcement material (100) including: an expansion-type steel pipe (110) inserted to be installed in a small-caliber drilled portion (A) having a diameter of 51 mm to 61 mm and expanded by hydraulic pressure; and a settlement member (120) coupled to a rear end of the expansion-type steel pipe (110). Here, the expansion-type steel pipe (110) is inserted into the sandy soil layer (11), and the settlement member (120) is inserted into a rock layer (12). In this case, the settlement member (120) of the ground reinforcement structure according to the present invention is fixed to the rock layer (12), fixing force is excellent.

A bolt or anchor 10 typically used in a rock body 14. The anchor 10 comprises an internal gripping formation with which the anchor can be fixed relative to the rock body 14. Moreover, the anchor 10 comprises an elongate body 20 which is configured for, in use, being received at least partially within a hole 12 in the rock body 14. The anchor 10 also comprises an internal fixing arrangement 30 which comprises a substance 32 which is received within a containing arrangement 34. In use, the containing arrangement 34 is arranged within the hole 12. An activating arrangement 36 is provided and configured for, in use, actuating the containing arrangement 34 and causing the internal fixing arrangement 30 to engage with the hole, thereby causing the elongate body 14 to become fixed within the hole 12.

An inflatable rock bolt including an expansion tube, a bushing arranged at each end of the expansion tube, and at least one reinforcing member arranged outside the expansion tube. The at least one reinforcing member includes at least one of a strand extending along the expansion tube or a sleeve at least partially surrounding the expansion tube. A method for reinforcing an inflatable rock bolt.

Rock bolts comprising an expandable tube having a longitudinally extending depression disposed between two curved outer portions of the tube, wherein the depression defines a channel having an opening defined between the two curved outer portions of the tube and the width of the opening is at least 10% of the width of the tube and/or a coating layer covers at least a portion of the expandable tube. Also, a method of manufacturing a rock bolt comprising forming an expandable tube comprising a longitudinally extending depression disposed between two curved outer portions of the tube, crimping a proximal end of the tube to form a crimped portion, and placing a sleeve around the crimped portion. Prior to crimping, a temporary spacer is placed in the channel in a portion of the tube adjacent to the portion of the tube that will be crimped.