Abstract: This invention relates to a reinforced concrete pile having a plurality of steel reinforcing cables and at least one ferrous metal alloy electrically conductive rod per cable which permits severing by oxygen cutting or electric arc welding.

Abstract: During the driving of a pile having an enlarged tip, uplift capacity is provided by pouring concrete into the annular space around the pile stem.

Abstract: After wet-drilling a hole until a bearing strata is reached, a mandrel with a removable overboot is lowered into the hole and the overboot is seated by a few hammer blows. The mandrel is then partly filled with thick concrete from its top, the top of the mandrel sealed, air-pressurized and a mechanical lifting force is applied. The pressure of the air within the mandrel plus the weight of the concrete forces off the overboot, and also forces the thick concrete against the sides of the hole, and the concrete forms a seal between the sides of the hole and the mandrel. The air pressure also helps lift the mandrel out of the hole.

Abstract: A concrete water retaining wall is formed by driving a plurality of concrete cylinder piles into the earth in closely spaced relationship along a line. Thereafter, elongated tubular flexible bags are inserted down into the spaces between adjacent cylinder piles and a cementitious hardenable material, such as grout, is pumped into the bags to expand them and to form a filler having an hourglass shaped cross section which interlocks with and forms a seal between adjacent piles.

Abstract: An alignment device adapted to position an elongated member such as a cable or the like within the interior of an associated enclosure. The device includes a hollow collar adapted to be placed in a close surrounding relationship with an axial section of the elongated member. The collar includes a longitudinal split in the side wall thereof between opposed spaced apart collar peripheral ends. These ends may be moved apart from each other for installing the device on the elongated member and then moved back toward each other to place the device in a close surrounding operative position thereon. An adjustable locking means facilitates locking the collar at the peripheral ends in the operative position and simultaneously prevents axial displacement of the peripheral ends relative to each other. A plurality of supporting legs extend outwardly of the collar at spaced intervals therearound and include support feet.

Abstract: According to the invention, a casing pipe is set on the ground and filled with a fluid, whereupon electric pulses are passed through the fluid to produce a series of electric discharges. The casing pipe is driven into the ground due to the resultant electrohydraulic effect. While the casing pipe is being pulled from the ground, it is filled with concrete mix which is compacted by passing electric pulses therethrough to produce electric discharges. The installation for effecting this method comprises a pile puller, a pile driver and a concrete feeder, all connected to the casing pipe. The pile driver incorporates a fluid feed system communicating with the casing pipe, and a pulse device with electrodes installed at the lower portion of the casing pipe, which is intended to produce electric discharges in the fluid fed into the casing pipe by the fluid feed system.

Abstract: A plurality of hollow prop casings are provided which are each composed of at least two telescopable sections. These sections are erected by putting them upright and are then telescoped apart until they bear upon the roof to be supported. They are then temporarily arrested in this position and filled with a hardenable substance in flowable condition which, when it hardens, forms a solid column that is able to support the roof. Reinforcing bars or similar elements may be provided in the interior of the prop casings to become embedded in the hardenable substance. Measures may be taken for facilitating disassembly of the prop casings with the solid columns therein, under circumstances in which the casings are subjected to downward pressure by the roof.

Abstract: A flexible bar reinforced concrete pile is provided herein composed of a steel tube containing therein a plurality of jointless high-strength flexible bars, strands or bundles of bar or strand located axially along the inside wall of said steel tube, the remaining space within the steel tube being packed with prepacked concrete or mortar, and a method for constructing the same.

Abstract: A process for building-up a pre-formed concrete piling while the piling is in place in terrain to form a finished piling foundation of uniform height above reference terrain level having a pre-formed portion and a cast-in-place portion.

Abstract: The present invention relates to a process of setting a concrete pile without noise or vibration which is thereby effective to decrease city noises. A concrete pile is sunk into a leading hole substantially concurrently with the progress of the excavation thereof. After the pile has been sunk through a desired distance, another supporting hole is excavated below the pile. A solidifying material, such as cement milk, mortar, or cement concrete including a cement expansion agent of calcium sulfoaluminate system or lime system, is poured into the supporting hole. The solidifying material is expanded within the supporting hole and permeates into the circumferential wall thereof, which is loosened by the excavation, so as to retighten the wall. Therefore, sufficient supporting force can be obtained.