The invention relates to a prestressed diaphragm wall in the ground (10) including a concrete panel (52), at least one anchor tube open at its upper end (38) and closed at its lower end (36) and, embedded at least partially in the concrete panel, at least one cable (60) extending inside the anchor tube (30), a lower portion of the cable (60) being fixed to said tube (30), and a cable anchoring system (90), configured to hold the cable in tension (60) and secure its upper portion (68) to the upper portion of the concrete panel (52). It also relates to a method for making a prestressed diaphragm wall.

A soldier pile wall for shoring an excavation site includes a plurality of drilled shafts drilled along an edge of the excavation site, a plurality of soldier piles, each of the plurality of soldier piles being positioned within a respective drilled shaft, and a pre-stressing system coupled to at least some of the plurality of soldier piles. The pre-stressing system is configured to induce stresses to counteract working stresses of the soldier pile wall. Related methods are also provided.

A soldier pile wall for shoring an excavation site includes a plurality of drilled shafts drilled along an edge of the excavation site, a plurality of soldier piles, each of the plurality of soldier piles being positioned within a respective drilled shaft, and a pre-stressing system coupled to at least some of the plurality of soldier piles. The pre-stressing system is configured to induce stresses to counteract working stresses of the soldier pile wall. Related methods are also provided.

A system for positioning and anchoring columns. The system includes a positioning template having a first frame configured to support horizontal panels, jacking mechanisms for leveling the horizontal panels, a first opening defined by the horizontally aligned panels configured to guide a sleeve when driven downward below grade level through the first opening, and a tubular sleeve for passing through the first opening and for receiving a second frame. The second frame includes frame members defining a second opening on each end of the second frame and a plurality of elongated bars spanning between the first end and the second end. The second frame is for guiding a pile when driven downward. A pile having a first end and an opposing second end is configured for receiving a connecting tube of a column. A column having a connecting tube is to inserted into the pile's first end.

Fibre optic sensors are used to monitor the integrity of a subsurface concrete structure such as a pile or diaphragm wall. A fibre optic sensor array (48) is attached to a reinforcement or framework assembly (20) for the subsurface concrete structure. Concrete is applied to surround the reinforcement or framework assembly (20) and fibre optic sensor array (48). The fibre optic sensor array (48) is then used to collect temperature data during hydration of the subsurface concrete structure. The temperature data is monitored in real time to determine differentials across the structure, indicative of a problem within the structure.

Fibre optic sensors are used to monitor the integrity of a subsurface concrete structure such as a pile or diaphragm wall. A fibre optic sensor array (48) is attached to a reinforcement or framework assembly (20) for the subsurface concrete structure. Concrete is applied to surround the reinforcement or framework assembly (20) and fibre optic sensor array (48). The fibre optic sensor array (48) is then used to collect temperature data during hydration of the subsurface concrete structure. The temperature data is monitored in real time to determine differentials across the structure, indicative of a problem within the structure.

A foundation device for a wind turbine tower includes a hollow main body with a lower face and an upper face. Both the lower face and the upper face contain a hollow space. Each of the faces include an outer perimeter and an inner perimeter. The main body additionally includes an outer lateral wall disposed between the outer perimeter of the lower face and the outer perimeter of the upper face, and an inner lateral wall between the inner perimeter of the lower face and the inner perimeter of the upper face. The device further includes a plurality of columns that project from the upper face of the main body.

A foundation device for a wind turbine tower includes a hollow main body with a lower face and an upper face. Both the lower face and the upper face contain a hollow space. Each of the faces include an outer perimeter and an inner perimeter. The main body additionally includes an outer lateral wall disposed between the outer perimeter of the lower face and the outer perimeter of the upper face, and an inner lateral wall between the inner perimeter of the lower face and the inner perimeter of the upper face. The device further includes a plurality of columns that project from the upper face of the main body.

A single-hole ultrasonic detection device for continuous integrity and a rock entry depth of a concrete diaphragm wall and a method using the same are provided. the single-hole ultrasonic detection device includes an apparatus host, an ultrasonic transducer and an ultrasonic signal feedback device, and the apparatus host is respectively connected to the ultrasonic transducer and the ultrasonic signal feedback device via a corresponding one of signal lines, the apparatus host includes an ultrasonic transmitter and an ultrasonic signal collector, the ultrasonic transmitter is configured to generate ultrasonic waves and the ultrasonic waves are transmitted via the ultrasonic transducer, the ultrasonic transducer is configured to collect and recover a reflected wave of the ultrasonic waves, convert signals of the reflected wave of the ultrasonic waves into electric signals, and send the electric signals back into the apparatus host.

A single-hole ultrasonic detection device for continuous integrity and a rock entry depth of a concrete diaphragm wall and a method using the same are provided. the single-hole ultrasonic detection device includes an apparatus host, an ultrasonic transducer and an ultrasonic signal feedback device, and the apparatus host is respectively connected to the ultrasonic transducer and the ultrasonic signal feedback device via a corresponding one of signal lines, the apparatus host includes an ultrasonic transmitter and an ultrasonic signal collector, the ultrasonic transmitter is configured to generate ultrasonic waves and the ultrasonic waves are transmitted via the ultrasonic transducer, the ultrasonic transducer is configured to collect and recover a reflected wave of the ultrasonic waves, convert signals of the reflected wave of the ultrasonic waves into electric signals, and send the electric signals back into the apparatus host.