Provided a bolt-bearing circumferential device for reinforcing and correcting an angle iron of a transmission tower, comprising a reinforcing angle iron, a holding hoop, and a connector; the reinforcing angle iron is arranged at an inner side of two limbs of an angle iron to be reinforced, an axis direction of the reinforcing angle iron is parallel to the angle iron to be reinforced, and an outer wall of two limbs of the reinforcing angle iron are fitted with an inner wall of the angle iron to be reinforced; the holding hoop is arranged at an outer side of the reinforcing angle iron and the angle iron to be reinforced, and each part of the holding hoop are connected together through the high-strength bolts; a side wall of the holding hoop is provided with three groups of threaded holes, wherein an axis of a first group of the threaded holes and an axis of a second group of the threaded holes are perpendicular to each other, a first group of bolts pass through the first group of the threaded holes to apply a reinforcing force to an outer side of a first limb of the angle iron to be reinforced, and a second group of bolts pass through the second group of the threaded holes to apply a reinforcing force to an outer side of a second limb of the angle iron to be reinforced; and, a third group of bolts pass through a third group of the threaded holes to apply a reinforcing force to the reinforcing angle iron through the connector.

Systems for reinforcement of structural elements such as piles, posts, pillars, and pipes are disclosed. The present invention features reinforced structural elements. The reinforced structural elements may include a sleeve structure positioned around a length of the structural element such that there is a chamber between the structural element and the sleeve structure. This chamber may be filled with concrete or another core filler material so as to reinforce the structural element. The sleeve structures of the present invention may be formed by the assembly of multiple staggered segmented layers of coupled reinforcing shells such as rigid, semi-rigid, or flexible fiber-reinforced shells.

Systems for reinforcement of structural elements such as piles, posts, pillars, and pipes are disclosed. The present invention features reinforced structural elements. The reinforced structural elements may include a sleeve structure positioned around a length of the structural element such that there is a chamber between the structural element and the sleeve structure. This chamber may be filled with concrete or another core filler material so as to reinforce the structural element. The sleeve structures of the present invention may be formed by the assembly of multiple staggered segmented layers of coupled reinforcing shells such as rigid, semi-rigid, or flexible fiber-reinforced shells.

According to the method, at least one carbon fibre-reinforced polymer band is joined to the steel structure at the end regions thereof, capable of transferring tensile forces. Subsequently, at least one lifting element (7) disposed between the carbon fibre-reinforced polymer band (4) and the steel girder (3) to be reinforced in a region between these end anchorages (5), is extended substantially perpendicular to the carbon fibre-reinforced polymer band (4). So, a tensile force stress is generated between the end regions of the carbon fibre-reinforced polymer band (4). Then, a steel girder treated in such a manner includes at least one carbon fibre-reinforced polymer band, which is each joined to the steel structure (1) at the end regions thereof, capable of transferring tensile forces. In the region between these end regions, a lifting element (7) is disposed between the carbon fibre-reinforced polymer band (4) and the steel girder (3) to be reinforced, by means of which the carbon fibre-reinforced polymer band (4) is subjected to tensile stress by lifting away from the steel girder (3). The tensile force is transferred to the steel girder (3) via the anchoring elements (5).

The present disclosure provides a grid fixing apparatus including a spacer-integrated retaining clip and a grid fixing method using the same capable of integrally forming a retaining clip and a spacer, forming a grid fixing apparatus to be tacked into an object through an anchor pin to firmly fix a grid reinforcement material to a surface or an outer side of the object, and fixing the grid reinforcement material in vertical and horizontal directions to precisely construct the grid reinforcement material and capable of being applied to all grid reinforcement materials manufactured in a lattice shape, such as a metallic mesh, a geogrid, and a textile grid made of a high-strength fiber, and being utilized in construction of a grid reinforcement material to which various binders such as concrete, mortar, a pavement material, and a finishing material are applied.

The invention relates to a method for reinforcing a civil engineering structure, comprising the following steps: —coating a surface of the structure with a first layer of resin in a fluid state, having a particle size distribution, termed first particle size distribution, —applying a layer of a dry woven fabric with a weight per unit area greater than or equal to 600 g/m2, termed high-grammage woven fabric, to the coated surface while the resin is still in the fluid state, by exerting on the woven fabric a pressure sufficient to impregnate it with resin, —coating the woven fabric with a second layer of resin, termed closure layer, in a fluid state, having a particle size distribution, termed second particle size distribution, which is less than or equal to the first particle size distribution.

A fiber-reinforced polymer anchoring system for a structural element includes a fiber-reinforced polymer member configured to provide external tensile reinforcement to the structural element; an anchoring device coupled with the fiber-reinforced polymer member and the structural element; wherein the anchoring device includes a metallic layer, a fiber-reinforced polymer layer, and a fastener for securing the anchoring device on the fiber-reinforced polymer member and the structural element.

An improved composite material used to connect, strengthen and/or repair concrete. The improved composite material includes a first fiber system including at least one fiber layer. Each fiber layer includes a plurality of fibers. The binding material can be used to optionally secure together the plurality of fibers. The improved composite material is positioned and secured in a slot cut in a concrete structure. The top edge of the improved composite material includes a recess portion.

A method is defined for attaching mounted parts on a mounting substrate formed of concrete or masonry, having a group of anchors wherein the following is true for the ratio VSd/NSd of the rated value for the transverse load VSd and of the rated value of the tensile load NSd of at least one anchor in the anchor group: VSd/NSd≥0.3, preferably VSd/NSd≥0.6 and particularly preferably VSd/NSd≥1.0, and wherein the characteristic resistances of these anchors to transverse loading VRk or to tensile loading NRk satisfy the following relationship: VRk/NRk≤1.1. The at least one anchor of the anchor group is inclined at an angle αAnker to the perpendicular to the surface of the mounting substrate in such a manner that the following is true: αAnker=k*¾*arc tan (VSd/NSd) for NSd>0, and αAnker=k*67.5° for NSd=0, where: 0.8≤k≤1.34, providing that αAnker≤75°.

The present invention provides an early warning device and a ductility control method for a prestressed FRP reinforced structure. By setting a tensioning screw, prestressed reinforcement can be converted into non-prestressed reinforcement when tensioning screw failure occurs, and the structure is still in a safe state. This can improve the bearing capacity and ductility of the reinforced structure, while the ductility can be controlled and designed, thereby resolving the problem of easy disconnection and brittle failure between the FRP and anchors, and greatly improving FRP utilization and structural safety.