A method of laying one or more concrete topping slabs over an existing concrete structure includes providing a concrete form defining an area on a surface of the concrete structure, drilling a hole into the surface of the concrete structure within the area, the hole being closer to a first border of the concrete form than to a second border of the concrete form opposite the first border, attaching first and second slip-dowel receiving sheaths respectively to the first and second borders, securing a first end portion of a bent metal bar in the hole with a second end portion of the bent metal bar extending parallel to the surface and the slip-dowel receiving sheaths toward the second border, and pouring a concrete mixture over the surface of the concrete structure and about the first and second slip-dowel receiving sheaths and the second end portion of the bent metal bar.

A manufacturing assembly and method produce a wire mesh including a plurality of longitudinal members and a monolithic transverse member secured to the plurality of longitudinal members. The monolithic transverse member includes a plurality of transverse portions that define a first cross-sectional shape, and further includes a plurality of longitudinal portions that define a second cross-sectional shape different than the first cross-sectional shape.

A module for the production of concrete parts has a row of displacement bodies that are adjacently arranged in a horizontal longitudinal direction (L) and that are clamped captively to a grid structure made of at least two individual grids running in the longitudinal direction (L). Surfaces of the grids are oriented in a transverse or inclined manner in relation to the horizontal. Each of the grids has at least a first and a second longitudinal bar arranged at a distance in parallel to one another and running in the longitudinal direction (L) and a plurality of transverse bars being arranged at a distance from one another and oriented in a transverse or inclined manner in relation to the horizontal. The transverse bars are respectively connected with the longitudinal bars. One of the displacement bodies for each grid has a first and a second retaining device.

An anchor for being embedded in concrete for attachment to a fastener to support a load comprises a plug having a main body portion extending upwardly from a base portion, the plug for being attached to a form board prior to pouring of concrete, the plug having an end portion disposed a distance from the form board; and an anchor body attached to the end portion. The plug is separable from the anchor body and removable from the concrete after the concrete is cured, leaving the anchor body embedded in the concrete, the plug providing a void in the concrete after removal to provide an access opening for a threaded portion of a fastener to attach to the anchor body.

Provided is an anchor assembly having a pre-stressed mandrel, which consists of an inner pre-stressed concrete mandrel and an outer cast-in-place anchoring slurry, wherein pre-stressed tendons are arranged inside the concrete mandrel and are prefabricated by a pretensioning method; the anchoring slurry wraps the pre-stressed concrete mandrel, and the cast-in-place anchoring slurry is formed by placing the pre-stressed concrete mandrel in a pile hole, and solidifying after primary grouting or secondary grouting. According to the anchor assembly, the pre-stress is not required to be tensioned and locked on site, so that the quality of the pre-stressed mandrel can be ensured, the on-site construction period can be greatly shortened, and the existing pre-stressed and common non-pre-stressed anchors can be replaced.

Method for installing a hollow concrete tower comprising the following steps: a) arranging a platform on a site; b) arranging on said platform at least one partial full-segment mould in a position such that the segment axis of the segment being cast in said mould is substantially vertical; c) pouring concrete inside said arranged partial mould(s); d) allowing the poured concrete to set to working strength, generating corresponding segment(s); e) removing the arranged mould(s) with concrete set to working strength, to leave the corresponding segment(s) exposed; f) assembling said corresponding exposed segment(s); and g) optionally, repeating steps b)-f) at least once.

Provided is an ultra-high-strength reinforcing bar and a method for manufacturing the same are disclosed. In an exemplary embodiment, the ultra-high-strength reinforcing bar includes an amount of 0.10 to 0.45 wt % carbon (C), an amount of 0.5 to 1.0 wt % silicon (Si), an amount of 0.40 to 1.80 wt % manganese (Mn), an amount of 0.10 to 1.0 wt % chromium (Cr), an amount greater than 0 and less than or equal to 0.2 wt % vanadium (V), an amount greater than 0 and less than or equal to 0.4 wt % copper (Cu), an amount greater than 0 and less than or equal to 0.5 wt % molybdenum (Mo), an amount of 0.015 to 0.070 wt % aluminum (Al), an amount greater than 0 and less than or equal to 0.25 wt % nickel (Ni), an amount greater than 0 and less than or equal to 0.1 wt % tin (Sn), an amount greater than 0 and less than or equal to 0.05 wt % phosphorus (P), an amount greater than 0 and less than or equal to 0.03 wt % sulfur (S), an amount of 0.005 to 0.02 wt % nitrogen (N), and the remainder being iron (Fe) and other inevitable impurities.

Provided is an ultra-high-strength reinforcing bar and a method for manufacturing the same are disclosed. In an exemplary embodiment, the ultra-high-strength reinforcing bar includes an amount of 0.10 to 0.45 wt % carbon (C), an amount of 0.5 to 1.0 wt % silicon (Si), an amount of 0.40 to 1.80 wt % manganese (Mn), an amount of 0.10 to 1.0 wt % chromium (Cr), an amount greater than 0 and less than or equal to 0.2 wt % vanadium (V), an amount greater than 0 and less than or equal to 0.4 wt % copper (Cu), an amount greater than 0 and less than or equal to 0.5 wt % molybdenum (Mo), an amount of 0.015 to 0.070 wt % aluminum (Al), an amount greater than 0 and less than or equal to 0.25 wt % nickel (Ni), an amount greater than 0 and less than or equal to 0.1 wt % tin (Sn), an amount greater than 0 and less than or equal to 0.05 wt % phosphorus (P), an amount greater than 0 and less than or equal to 0.03 wt % sulfur (S), an amount of 0.005 to 0.02 wt % nitrogen (N), and the remainder being iron (Fe) and other inevitable impurities.

A number of modular preformed skeletal steel panels are mounted side by side in a row on a building structure to form a composite panel assembly on the building structure. Each modular preformed skeletal steel panel comprises two mesh layers, namely a bottom mesh layer and a top mesh layer supported spaced-apart in parallel planes by intermediate spacers extending between the layers. The bottom layer has a plurality of spaced-apart outwardly projecting splice bars for interengagement with an adjacent preformed skeletal steel panel in the panel assembly thus facilitating interengagement of the modular preformed skeletal steel panels in the composite panel assembly. Each spacer comprises a cross member engaged with the top layer and having outwardly extending legs at opposite ends of the cross member. A lower end of each leg terminates in a foot which engages with the bottom layer. The cross member, legs and feet are all mutually perpendicular.

A concrete sandwich composite structure of an ultra-high performance concrete wrapped steel tube includes a steel arch, a plurality of connecting members and an ultra-high performance concrete layer. The plurality of connecting members are arranged on an outer wall of the steel arch at intervals, and one end of each connecting member is fixedly connected with the outer wall of the steel arch; and the ultra-high performance concrete layer is arranged on the outer wall of the steel arch and connected with the outer wall of the steel arch through the connecting members, and the ultra-high performance concrete layer can effectively prevent water from being contacted with the steel arch, so that a durability of the steel arch is improved, and an isolating agent is further arranged between the ultra-high performance concrete layer and the outer wall of the steel arch, and an elongated shear nail in the connecting member is wrapped by rubber, so that the interaction between the ultra-high performance concrete layer and a main body structure of the steel arch can be reduced, the effects of releasing a stress of the ultra-high performance concrete layer and reducing a thickness are achieved, and plain concrete can be poured into the steel arch to improve an anti-collision performance.