The invention relates to apparatus and methods for constructing diaphragm walls. A guideway tube is provided for casting into a concrete panel along a height of a face of the concrete panel, comprising: an elongate guideway track comprising at least one elongate side wall and an elongate slot along the at least one elongate side wall, the elongate slot having a first width; and, an elongate closure panel comprising: a rear panel portion configured to close the elongate slot enclosing an elongate internal volume, and, a front panel portion of a second width greater than the first width. Preferably the rear panel portion is a close fit within elongate slot sufficient to resist the ingress of slurry and concrete. Preferably the rear panel portion is configured to engage the elongate slot in a manner configured to resist compression forces.

The invention relates to apparatus and methods for constructing diaphragm walls. A guideway tube is provided for casting into a concrete panel along a height of a face of the concrete panel, comprising: an elongate guideway track comprising at least one elongate side wall and an elongate slot along the at least one elongate side wall, the elongate slot having a first width; and, an elongate closure panel comprising: a rear panel portion configured to close the elongate slot enclosing an elongate internal volume, and, a front panel portion of a second width greater than the first width. Preferably the rear panel portion is a close fit within elongate slot sufficient to resist the ingress of slurry and concrete. Preferably the rear panel portion is configured to engage the elongate slot in a manner configured to resist compression forces.

Embodiments of the disclosure provide a dredging apparatus, including a buoyant platform having an upper surface, a lower surface configured to float on a body of water, and an opening having a horizontal cross-sectional area and extending from the upper surface through the lower surface. A set of supports, mechanically coupled to the platform, is configured to maintain a position of the buoyant platform above a dredge site at a bottom of the body of water. A turbidity curtain, coupled to the platform using a plurality of telescoping members, surrounds at least the horizontal cross-sectional area of the opening. A bubble tube frame, coupled to the turbidity curtain and extending outwardly therefrom to surround the turbidity curtain, includes a plurality of outlets configured to emit bubbles into the body of water around a perimeter of the dredge site.

Disclosed is a shielding apparatus for high-depth groundwater well pollution prevention grouting comprising: a shielding portion which is provided on the outer circumferential surface of a grouting casing installed in an excavation hole in the ground and compressed to be in close contact with a hollow wall of the excavation hole; a compression portion which is provided on the outer circumferential surface of the grouting casing and formed to descend toward the shielding portion and brings the shielding portion into close contact with the hollow wall of the excavation hole to guide the excavation hole to be sealed; and a pressure equalization injection tube portion which is connected with the compression portion on the outer circumferential surface of the grouting casing and lowers the compression portion by water pressure generated by supplying water from the outside through a water supply tube.

Disclosed is a shielding apparatus for high-depth groundwater well pollution prevention grouting comprising: a shielding portion which is provided on the outer circumferential surface of a grouting casing installed in an excavation hole in the ground and compressed to be in close contact with a hollow wall of the excavation hole; a compression portion which is provided on the outer circumferential surface of the grouting casing and formed to descend toward the shielding portion and brings the shielding portion into close contact with the hollow wall of the excavation hole to guide the excavation hole to be sealed; and a pressure equalization injection tube portion which is connected with the compression portion on the outer circumferential surface of the grouting casing and lowers the compression portion by water pressure generated by supplying water from the outside through a water supply tube.

The invention relates to apparatus and methods for constructing diaphragm walls. A guideway tube is provided for casting into a concrete panel along a height of a face of the concrete panel, comprising: an elongate guideway track comprising at least one elongate side wall and an elongate slot along the at least one elongate side wall, the elongate slot having a first width; and, an elongate closure panel comprising: a rear panel portion configured to close the elongate slot enclosing an elongate internal volume, and, a front panel portion of a second width greater than the first width. Preferably the rear panel portion is a close fit within elongate slot sufficient to resist the ingress of slurry and concrete. Preferably the rear panel portion is configured to engage the elongate slot in a manner configured to resist compression forces.

The invention relates to apparatus and methods for constructing diaphragm walls. A guideway tube is provided for casting into a concrete panel along a height of a face of the concrete panel, comprising: an elongate guideway track comprising at least one elongate side wall and an elongate slot along the at least one elongate side wall, the elongate slot having a first width; and, an elongate closure panel comprising: a rear panel portion configured to close the elongate slot enclosing an elongate internal volume, and, a front panel portion of a second width greater than the first width. Preferably the rear panel portion is a close fit within elongate slot sufficient to resist the ingress of slurry and concrete. Preferably the rear panel portion is configured to engage the elongate slot in a manner configured to resist compression forces.

The present invention provides a multi-layer barrier assembly or device for post-installation injection of a resin, grout, or other fluid fluid. The barrier device comprises first and second layers defining an intermediate open-matrix layer, and at least one injection conduit member in parallel orientation with respect to the first and second layers and having openings for injecting fluid into the intermediate open-matrix layer. The injection conduit may be located between and in parallel orientation with respect to the first and second layers, along an edge of the first and/or second layers, along an outer face of the first layer (if the first layer is a woven or nonwoven fabric), or at any combination of these locations, to enable fluid to be conveyed into the intermediate open-matrix layer. The invention also provides for use of a gel activator within the barrier device cavity, such as pre-installed on open-matrix structure which used for separating the first and second layers of the barrier device, such that a highly flowable injection fluid can be introduced into the device, and its gelation or hardening will be initiated or accelerated by the presence of the gel activator. This will allow for low power grout pumps to be used and facilitate the sealing of fine cracks in the surrounding concrete.

The present invention provides a multi-layer barrier assembly or device for post-installation injection of a resin, grout, or other fluid fluid. The barrier device comprises first and second layers defining an intermediate open-matrix layer, and at least one injection conduit member in parallel orientation with respect to the first and second layers and having openings for injecting fluid into the intermediate open-matrix layer. The injection conduit may be located between and in parallel orientation with respect to the first and second layers, along an edge of the first and/or second layers, along an outer face of the first layer (if the first layer is a woven or nonwoven fabric), or at any combination of these locations, to enable fluid to be conveyed into the intermediate open-matrix layer. The invention also provides for use of a gel activator within the barrier device cavity, such as pre-installed on open-matrix structure which used for separating the first and second layers of the barrier device, such that a highly flowable injection fluid can be introduced into the device, and its gelation or hardening will be initiated or accelerated by the presence of the gel activator. This will allow for low power grout pumps to be used and facilitate the sealing of fine cracks in the surrounding concrete.

Disclosed is a shielding apparatus for high-depth groundwater well pollution prevention grouting comprising: a shielding portion which is provided on the outer circumferential surface of a grouting casing installed in an excavation hole in the ground and compressed to be in close contact with a hollow wall of the excavation hole; a compression portion which is provided on the outer circumferential surface of the grouting casing and formed to descend toward the shielding portion and brings the shielding portion into close contact with the hollow wall of the excavation hole to guide the excavation hole to be sealed; and a pressure equalization injection tube portion which is connected with the compression portion on the outer circumferential surface of the grouting casing and lowers the compression portion by water pressure generated by supplying water from the outside through a water supply tube.