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 fluid housing for a spray gun includes a main body with a first inlet for connection to a source of pressurized air, a second inlet for connection to a source of a first polyurethane foam component, and a third inlet for connection to a source of a second polyurethane foam component. The main body also includes a valve block having a center gear, a first valve gear coupled to and driven by the center gear, a second valve gear coupled to and driven by the center gear, and a third valve gear coupled to and driven by the center gear.

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.

An acoustic sleeper for sound suppression in a floor assembly may be formed as a solid sleeper body made entirely from a resilient acoustic isolating material. The sleeper body has a thickness, a width, a length, a generally rectangular cross-section and first and second sides. The sleeper body first side includes a first side area and a first sleeper load-bearing surface for contacting a first floor assembly structure, the first sleeper load-bearing surface having a first load-bearing surface area equal to or less than the first side area. The sleeper body second side has a pair of solid sleeper feet extending therefrom. The sleeper feet collectively provide a second sleeper load-bearing surface for contacting a second floor assembly structure. The second sleeper load-bearing surface has a second load-bearing surface area that is less than the first side area by at least a factor of three.

An improved method of creating a waterproof seal for post tension cable systems roughens and decontaminates the cable's stressing end pocket with a diamond bladed reaming tool and closes the newly formed cavity with epoxy resin and a precasted plug made of non-shrink grout. The method includes pouring a concrete slab around an anchor and a pocket former through which a cable passes and is held by wedges. After the pocket former is removed and the cable is stressed, the cable is cut and a grease cap is applied. The system ensures that the cable is properly cut, the grease cap is properly seated, the inside of the pocket is roughened, and the seal at the cable's stressing end is waterproof. Furthermore, the invention aids in removing previously grouted pockets when cable remediation is needed and closing the pocket with a precasted plug when cable remediation is completed.

Systems and methods for treating concrete, which includes the steps of wetting a surface of concrete with colloidal silica, allowing time for the colloidal silica to penetrate the concrete surface, and cutting the surface of the concrete with a bladed or segemented tool wherein the longitudinal blade or edge portion is positioned approximately at an angle between 30 degrees and 90 degrees relative to the surface of the concrete.

Systems and methods for treating concrete, which includes the steps of wetting a surface of concrete with colloidal silica, allowing time for the colloidal silica to penetrate the concrete surface, and cutting the surface of the concrete with a bladed or segemented tool wherein the longitudinal blade or edge portion is positioned approximately at an angle between 30 degrees and 90 degrees relative to the surface of the concrete.

An improved method of creating a waterproof seal for post tension cable systems roughens and decontaminates the cable's stressing end pocket with a diamond bladed reaming tool and closes the newly formed cavity with epoxy resin and a precasted plug made of non-shrink grout. The method includes pouring a concrete slab around an anchor and a pocket former through which a cable passes and is held by wedges. After the pocket former is removed and the cable is stressed, the cable is cut and a grease cap is applied. The system ensures that the cable is properly cut, the grease cap is properly seated, the inside of the pocket is roughened, and the seal at the cable's stressing end is waterproof. Furthermore, the invention aids in removing previously grouted pockets when cable remediation is needed and closing the pocket with a precasted plug when cable remediation is completed.

A system, device, and method for plugging core holes. A core hole plug includes a top compression plate, a bottom compression plate, and a rubber expansion ring that separates the top and bottom compression plates. A beveled screw hole can be created on the top compression plate. The beveled screw hole matches the angle of the bottom surface of the head of a flat head bolt to ensure that the bolt remains flush with the top compression plate. The rubber expansion ring can be squeezed between the top and bottom compression plates as the flat head bolt is screwed into a threaded receiver nut formed on the bottom compression plate. An installation tool can be utilized to install the core hole plug so that the top compression plate remains flush with an existing floor surface.

Cantilevers are a common occurrence in the field of mechanics. Typically, the analysis of cantilevers involves the use of a uni-axial system common to the analysis of a cross section undergoing flexural deformation. The internal arch diaphragm utilizes a biaxial system of forces to redirect flexural forces that ordinarily cause a cantilever span to fail, into a tension force that can be controlled via reinforcing or other stress control technique such as quenching depending on the material used.

The resulting system is lighter, stronger, and more capable of achieving system benchmarks unreachable without this technique. Further the elimination or rearrangement of support conditions in non cantilevered systems to accommodate the internal arch diaphragm allows for new mechanical systems.