A core form device including a circular plate and a plurality of bendable arms extending from the circular plate which when bent about the circular plate form the core form device.

An injection port for a spray gun includes a first end and a second end disposed opposite the first end along a longitudinal axis. The injection port also includes an interior passage extending between the first end and the second end along the longitudinal axis, and a plurality of blind bores disposed at the first end, each blind bore extending perpendicular to the longitudinal axis.

A method of slip forming a concrete structure can include using a first slip form mold that travels along a path to form a portion of a concrete structure by delivering a first flow of concrete into the first mold through a first hopper. The first hopper can be configured to receive the first flow of concrete. The portion of the concrete structure can be modified using a second slip form mold different from the first mold by advancing the second mold along the concrete structure and, while advancing the second mold, delivering a second flow of concrete into the second mold through a second hopper that is configured to receive the second flow of concrete.

A swivel connector for a spray gun includes a first portion, the first portion including a first interior passage that extends entirely through the first portion along a longitudinal axis and a second a second interior passage that extends along a first axis perpendicular to the longitudinal axis. The swivel connector also includes a second portion coupled to the first portion, the second portion including a third interior passage that extends entirely through the second portion along the longitudinal axis, and a fourth interior passage that extends along a second axis perpendicular to the longitudinal axis. The swivel connector also includes a connector pin coupled to both the first portion and the second portion, wherein the connector pin includes a fifth interior passage that extends along the longitudinal axis.

A construction process for enhancing or repairing a concrete floor structure that includes a carbon fiber grid as a reinforcement component is disclosed. The process includes forming a trench at a top surface of the concrete floor structure, and placing a reinforcement material in the formed trench. Then, a concrete bonding agent is applied into the trench. Then, the trench is filled with concrete. As a result, the concrete floor structure is enhanced or repaired to have at least one additional reinforcement component other than the carbon fiber grid.

A construction process for enhancing or repairing a concrete floor structure that includes a carbon fiber grid as a reinforcement component is disclosed. The process includes forming a trench at a top surface of the concrete floor structure, and placing a reinforcement material in the formed trench. Then, a concrete bonding agent is applied into the trench. Then, the trench is filled with concrete. As a result, the concrete floor structure is enhanced or repaired to have at least one additional reinforcement component other than the carbon fiber grid.

A swivel connector for a spray gun includes a first portion, the first portion including a first interior passage that extends entirely through the first portion along a longitudinal axis and a second a second interior passage that extends along a first axis perpendicular to the longitudinal axis. The swivel connector also includes a second portion coupled to the first portion, the second portion including a third interior passage that extends entirely through the second portion along the longitudinal axis, and a fourth interior passage that extends along a second axis perpendicular to the longitudinal axis. The swivel connector also includes a connector pin coupled to both the first portion and the second portion, wherein the connector pin includes a fifth interior passage that extends along the longitudinal axis.

A portable apparatus and method for cutting linear trenches in a concrete ground surface includes two bars extending in parallel spaced relation along the concrete with an elongated track removably fastened and extending orthogonally thereto. A trolley supporting a motor-driven cutting wheel is movably engaged with the track. A depth adjuster alternately lowers and raises the cutting wheel to engage and disengage the concrete while the trolley follows contours of the concrete to cut a kerf of uniform depth. The track is selectively movable to spaced locations along the lengths of the two bars to cut a first plurality of parallel kerfs in a first direction. The apparatus is rotatable about a vertical axis to cut a second plurality of parallel kerfs oriented in a second direction at a predetermined angle, e.g., 90 degrees, to the first direction, to form a simulated tile pattern in the concrete.

The present concrete crack repair device (CCRD) can be comprised of two nodules connected by an elongated strip wherein the elongated strip can be narrower than the nodules in at least one plane. Both the elongated strip and the nodules can comprise carbon fibers wherein most of the carbon fibers are located within the same plane maximizing the tensile strength of the device. Installation of the CCRD can be performed by drilling holes into the surface of the concrete on either side of the crack and cutting a slot in the surface of the concrete between the two holes, or adding the holes after the slot has been cut, wherein the slot and holes are located in a line that is roughly perpendicular to the crack. The CCRD can then be installed by placing each nodule in a hole and the elongated strip within the slot.

A method of slip forming a concrete structure can include using a first slip form mold that travels along a path to form a portion of a concrete structure by delivering a first flow of concrete into the first mold through a first hopper. The first hopper can be configured to receive the first flow of concrete. The portion of the concrete structure can be modified using a second slip form mold different from the first mold by advancing the second mold along the concrete structure and, while advancing the second mold, delivering a second flow of concrete into the second mold through a second hopper that is configured to receive the second flow of concrete.