A self-starting negative pressure drainage system for draining groundwater in a slope, includes: a declined borehole, a pipe boot, a permeable pipe and a drain pipe; wherein the declined borehole is divided into a permeable drilling section and a sealed grouting drilling section; wherein the permeable drilling section is on a lower portion of the declined borehole, and the sealed grouting drilling section is on an upper portion of the declined borehole; a water stop ring made of water-expanding rubber is provided between the permeable drilling section and the sealed grouting drilling section; the permeable drilling section comprises the permeable pipe; a top of the permeable pipe contacts the water-expanding rubber; a cavity is formed in the permeable pipe, an inlet of the drain pipe passes through the water stop ring made of water-expanding rubber and is inserted into the permeable pipe.

A self-starting negative pressure drainage system for draining groundwater in a slope, includes: a declined borehole, a pipe boot, a permeable pipe and a drain pipe; wherein the declined borehole is divided into a permeable drilling section and a sealed grouting drilling section; wherein the permeable drilling section is on a lower portion of the declined borehole, and the sealed grouting drilling section is on an upper portion of the declined borehole; a water stop ring made of water-expanding rubber is provided between the permeable drilling section and the sealed grouting drilling section; the permeable drilling section comprises the permeable pipe; a top of the permeable pipe contacts the water-expanding rubber; a cavity is formed in the permeable pipe, an inlet of the drain pipe passes through the water stop ring made of water-expanding rubber and is inserted into the permeable pipe.

A self-drilling differential grouting combined bolt, as described consists essentially of a drill (1), a grouting pipe (2), a spindle (3), a bolt head mechanism and a bolt tail mechanism, wherein the bolt head mechanism comprises a fixed ring (4), a slip ring (7), a limiting pipe (6) and several pairs of driven linkages (501) and driving linkages (502); and the bolt tail mechanism comprises a bolt disc (11), a connecting cap (12), a spring (13) and a nut (14), the bolt disc (11) is sleeved on a rear end of the grouting pipe (2), the connecting cap (12) is passed through by the spindle (3) and blocks off the rear end of the grouting pipe (2), the connecting cap (12) is provided with a grouting hole in communication with the grouting channel in the grouting pipe (2), and a grouting hole and an air vent are provided in the bolt disc (11).

The invention relates to a jet anchor which ensures the fixation of the lateral support elements on the surface to mass formed by high pressure jet injection with purpose of providing stabilization of the excavation surface during excavation support and slope stability works, said jet anchor provides the combined usage of anchor body (120), ducted cutting wing (140), connectors, rigid wing opening plate (130), rope pulling apparatus (110), guide pipe elements (150) with new anchor equipment and jet grouting system and thus obtaining strength increased anchor element.

The invention relates to a jet anchor which ensures the fixation of the lateral support elements on the surface to mass formed by high pressure jet injection with purpose of providing stabilization of the excavation surface during excavation support and slope stability works, said jet anchor provides the combined usage of anchor body (120), ducted cutting wing (140), connectors, rigid wing opening plate (130), rope pulling apparatus (110), guide pipe elements (150) with new anchor equipment and jet grouting system and thus obtaining strength increased anchor element.

The invention relates to an anchor device for a prestressed diaphragm wall (2), comprising at least one prestressing reinforcement (3) and a sleeve (5) encasing said at least one prestressing reinforcement (3) and forming an anchorage for said at least one prestressing reinforcement (3) in the diaphragm wall (2), a length (Ld) of the anchor sleeve (5) being strictly less than a length (La) of said at least one prestressing reinforcement (3), the anchor sleeve (5) comprising a sealing material disposed in such a way as to coat each prestressing reinforcement (3), the anchor device (1) comprising a corrosion-resistant coating of each prestressing reinforcement (3).

The invention relates to an anchor device for a prestressed diaphragm wall (2), comprising at least one prestressing reinforcement (3) and a sleeve (5) encasing said at least one prestressing reinforcement (3) and forming an anchorage for said at least one prestressing reinforcement (3) in the diaphragm wall (2), a length (Ld) of the anchor sleeve (5) being strictly less than a length (La) of said at least one prestressing reinforcement (3), the anchor sleeve (5) comprising a sealing material disposed in such a way as to coat each prestressing reinforcement (3), the anchor device (1) comprising a corrosion-resistant coating of each prestressing reinforcement (3).

A self-drainage anchor cable system is provided, wherein a drainage section (15) is arranged above the internal anchoring section (14) of an anchor cable; a first end of the steel strand (2) extends into a bottom of the borehole (1); the isolation pipe (3) is sleeved on the steel strand (2) in the drainage section (15), and the permeable pipe (4) is sleeved on the isolation pipe (3); a length of the isolation pipe (3) is larger than a length of the permeable pipe (4), and there is a space (5) between the isolation pipe (3) and the permeable pipe (4); the water stop rings made of water-expanding rubber (6) are provided at both ends of the isolation pipe (3), and end portions of the permeable pipe (4) are in contact with the water-expending rubber water stop rings (6) A construction method for the self-drainage anchor cable system is also provided.

A ground anchor assembly for quick and efficient installation into the ground, the assembly having a ground anchor post with a shaft with an upper end and lower end, the upper end having a threaded shaft section and the lower end having a helical blade portion, a rotating drive engaging end located on the upper end, a ground anchor post support device and a hollow main post wherein the hollow main post slidably engages the upper end of the ground anchor post when inserted into the ground and any lateral forces applied to the hollow main post is transferred out through to the ground anchor support device.

A ground anchor assembly for quick and efficient installation into the ground, the assembly having a ground anchor post with a shaft with an upper end and lower end, the upper end having a threaded shaft section and the lower end having a helical blade portion, a rotating drive engaging end located on the upper end, a ground anchor post support device and a hollow main post wherein the hollow main post slidably engages the upper end of the ground anchor post when inserted into the ground and any lateral forces applied to the hollow main post is transferred out through to the ground anchor support device.