A method for joining braids that are used for a braid-reinforced hollow fiber membrane, produced by the method inserting a core material into the hollow parts of ends of two braids to be joined to connect the two braids, covering the joint part with a heat-shrinkable tube, and shrinking the heat-shrinkable tube by heating at 120 to 160 C., thereby joining the braid ends together, and that can exhibit sufficient joint strength when load is applied during spinning, or when a porous hollow fiber membrane is used as a treatment membrane for water purification treatment, sewage and waste water treatment, etc. A braid-reinforced porous hollow fiber membrane is produced by allowing braids whose ends are joined by the above method to pass through the inner nozzle of a double annular spinning nozzle, applying a membrane-forming dope discharged from the outer nozzle of the double annular spinning nozzle to the outer surfaces of the joined braids passing through the inner nozzle of the double annular spinning nozzle for impregnation, then coagulating the braids in a coagulating liquid, and winding the braids on a bobbin.

A pipeline system is enclosed including unlined or plastic lined pipes. A mechanical metal to metal connection is employed that can provide a fluid tight seal. A pipe coupling may be employed to span the connection. Plastic lined pipes can have their plastic liners connected to form a fluid tight bladder. Electro fusion may be employed.

A method and device for connecting and repairing a shear web includes the method steps of dry-fitting a shear web insert in a rotor blade assembly to establish a perimeter gap at an angled perimeter interface between the shear web insert and the rotor blade assembly, the angled perimeter interface positioned between the shear web insert and at least one adjacent surface of a first shear web, a second shear web, a first side of the rotor blade assembly, and a second side of the rotor blade assembly, and then injecting a bonding paste into the perimeter gap. The rotor blade assembly can include a connecting device having at least one pre-fabricated clip.

A method of manufacturing a hollow composite structure is provided. The method includes forming a first portion of the hollow composite structure having at least one open region and at least one wall, the at least one wall partially defining a hollow interior. The method also includes bonding a laminate shell to the first portion of the hollow composite structure proximate to at least one location of the wall to cover the open region and enclose the hollow interior. The method further includes disposing a second portion of the hollow composite structure over the laminate shell, the second portion comprising a plurality of plies. The method yet further includes curing the first portion and the second portion during a final cure.

Induction Weldable Pipe Connectors (IWPCs) (400) for electromagnetic induction welding with at least one plastic pipe (30). IWPCs (400) include a tubular induction weldable mounting (401) having an opposite pair of induction weldable sockets (404A, 404B), a tubular cover (406) externally mounted on the induction weldable mounting (401), and a tubular pipe tang (407) internally disposed in one induction weldable socket (404A, 404B) for destining an induction weldable socket (404A, 404B) as an induction weldable pipe socket (408A, 408B) for forced sliding insertion of a pipe end (31) thereinto. The cover (406) includes an opposite pair of thermally insulated induction weldable socket mouth rims (426A, 426B) for entrapping melted solder lining (412) inside the induction weldable mounting (401) during an electromagnetic induction welding operation, thereby ensuring improved welding.

The present invention provides a to method for reinforcing a wind turbine blade, such as a root end. The root end comprises a first and a second bushing for attaching the wind turbine blade to a wind turbine hub, the bushings being located between an inner sidewall of the root end and an outer sidewall of the root end, the bushings being separated by retaining material, the method comprising forming a first injection channel in the retaining material; forming a first pressure release channel in the first retaining material, wherein the first pressure release channel is formed to be in fluid communication with the first injection channel in a region between the inner sidewall and the outer sidewall; and injecting adhesive material into the first injection channel at least until adhesive material enters the formed first pressure release channel. The invention also provides a wind turbine blade having a root end that has been reinforced using such a method. Further aspects are provided.

Methods are provided for joining a composite component, such as a rotor blade of a wind turbine. Accordingly, a first blade segment is provided and a bladder assembly is positioned thereon. Additionally, an adhesive element is positioned in a first position on the first blade segment. A second blade segment is positioned with the first blade segment so as to define an inner cavity therebetween. The inner cavity contains the adhesive element and the bladder assembly, but the adhesive element does not contact the second blade segment while in the first position. The bladder assembly is inflated to transition the adhesive element to a second position in contact with both the first blade segment and the second blade segment. With the adhesive element in contact with both blade segments, the adhesive element is allowed to cure in order to secure the blade segments to one another.

Aircraft stringers having carbon fiber reinforced plastic (CFRP) material reinforced flanges are disclosed. An example stringer to be coupled to a skin of an aircraft comprises a flange. The flange includes a first portion of a first stiffening segment. The flange further includes a first portion of a second stiffening segment coupled to the first portion of the first stiffening segment. The flange further includes a CFRP reinforcement segment coupled to the first portion of the first stiffening segment and to the first portion of the second stiffening segment. The CFRP reinforcement segment strengthens the first portion of the first stiffening segment and the first portion of the second stiffening segment.

A method and apparatus for assembling a wind turbine blade (10) including first and second outer shell portions (16, 18) and an internal web (12) are provided. An adhesive material (42) is applied to a top end (30) of the internal web (12) as well as the edges (62, 64) of the first outer shell portion (16) for connection to the second outer shell portion (18). Localized heat energy is applied to pre-cure the adhesive material (42) at the top end (30) of the internal web (12) before applying heat energy to fully cure all of the adhesive material (42) in the wind turbine blade (10). The pre-curing is performed by a removable localized heater device (72), and it assures that the integrity of the bond between the internal web (12) and the second outer shell portion (18) is maintained during the full curing of the blade (10), when temporary thermal deformation of the outer shell (14) sometimes occurs.

A device (20) for installing a tubular junction sleeve inside a pipe (1), having a mandrel (20a) of longitudinal axis (XX) supporting on its surface at least a first peripheral chamber (21) having a wall (21a) that is radially expandable by inflation. The first wall including at least one electrical connector (21b) suitable for being connected to one end of said heater wire. The connector being connected to an umbilical (24) including at least a compressed air feed duct for inflating the first chamber and an electrical power supply duct connected to the electrical connector. The device being characterized in that the mandrel supports on its outer surface a second peripheral chamber (22) having a wall (22a) that is radially expandable by inflation, and also a weld inspection device (23) arranged in the longitudinal direction of the mandrel.