Prefabricated beam-pillar connections with Peikko shoes and anchor bolts

2022-07-16 18:41:50 By : Ms. Rose Xu

Beam-pillar connections: intelligent solutions to guarantee the stability of rigid frames.Below is a technical sheet with which Peikko Italia explores the beam-pillar connection systems with shoes for beams and log bolts. Rigid and intelligent solutions by Peikko GroupWhen we talk about the beam-pillar connection, in fact it is the same connection that is used for the pillar-foundation system, used horizontally, rather than vertically as is the case for the pillar-foundation system.In general, prefabricated structures today require only a simple support of the beam on the concrete shelf and as a physical constraint a bar is introduced that comes out of the shelf and passes through the beam, with the sole function of preventing the beam from losing its support.Peikko Italia, on the other hand, offers two intelligent solutions with which it is possible to create a rigid connection between beams and pillars: one that involves the use of COPRA® Anchor Bolts and BECO® Beam Shoes and the other that combines the two previous elements with Sleeves. for Modix® armor.Construction of a Pipe rack with Peikko's COPRA®-BECO® system.COPRA® Anchor Bolts and BECO® Beam ShoesIt is a multifunctional anchoring system for all bolted connections: COPRA® anchor bolts are mainly used with BECO® beam shoes.The COPRA® anchor bolt consists of a reinforcing bar with a threaded bushing at the end to make bolted connections for precast concrete structures.These anchor bolts transfer tensile, compressive and shear forces through the connection both during the assembly and final stages and are suitable for all types of concrete structures.The COPRA® anchor bolts, having removable threaded bars and therefore remaining within the shape of the prefabricated element, avoid the risk of damage to the protruding steel elements during construction.BECO® beam shoes are products used to create economical and bending-resistant connections between precast concrete columns and beams.The beam-to-column connection is created with beam shoes and log bolts.The shoes for beams are inserted into the casting of the precast concrete beams, while the log bolts are inserted into the casting of the pillars.On site, the beams are mounted on brackets, positioned correctly and fixed to the log bolts through threaded bars.By making these two systems, COPRA® and BECO®, work together, an anchoring joint is obtained that has no element protruding from the pillar and this aspect is very important both from the point of view of production and management of the construction site.It is very useful, for example, when the construction of a cantilevered element is required: starting from the pillar, the cantilever beam is positioned which must be fixed above and below with the COPRA® and BECO® system and in this way I obtain the desired cantilever, without protruding elements.An advantageous solution also in the factory, during production, as it does not involve warehouse projections and holes on the formwork.Beam-pillar connections made with Peikko's COPRA®-BECO® system.COPRA® Anchor Bolts and BECO® Beam Shoes + MODIX® Armor SleevesThis type of connection, on the other hand, is particularly efficient when an integrative casting of the floor is envisaged.The beam is placed on the pillar, the COPRA® and BECO® systems are screwed into the lower part of the beam, and the MODIX® system on the upper part of the beam: at this point it is possible to proceed with the support of the floor elements and with the completion casting.Once the concrete has been poured and the connection has matured, it functions as a rigid connection.The MODIX® reinforcement sleeve is in fact proposed as a flexible and safe mechanical joining system for reinforcing bars.The unique visual inspection system allows you to easily and safely check that all joints are properly tightened.MODIX® reinforcement sleeves are in fact used to make mechanical connections between reinforcing bars with improved adhesion and cast-on-site and prefabricated concrete structures.MODIX® consists of prefabricated male (SMB) and female (SMA) threaded sleeves pressed onto the reinforcing bars.The standard SMA and SMB sleeves allow you to connect all reinforcing bars with a diameter between 10 and 40 mm.Detail of the COPRA®-BECO ® -MODIX® system for making rigid nodes in prefabricated structures.Other uses of PEIKKO anchor jointsThe COPRA® anchor joints, in addition to being used for beams-pillars connections, have been designed to be used also for pillar-foundations connections where there is the need for the bars not to protrude from the foundation.This is very useful during the construction phase as after laying the log bolts, it will be sufficient to protect the bushings with grease and seal them;after which anyone who needs to do so will be able to walk on these systems either on foot or with heavy vehicles on site, without any kind of problems.Subsequently, only when the pillars are assembled, will the threaded bar necessary for the pillar-foundation connection made with the COPRA® elements be mounted.With these systems Peikko is recently carrying out many interventions on Pipe racks, that is those large structures that support the deployment of pipes in industrial plants.Usually these structures are made of steel, but lately there is a tendency to see their construction through prefabricated concrete elements, for example to avoid excessive corrosion given by the nearby presence of the sea.In the south of France, for example, on the sea, these systems were used for the construction of a regasification plant capable of receiving the LNG carriers that carry the liquefied gas conveyed in the pipes supported by these Pipe racks.Once the gas has reached the plant, it is returned to its gaseous state: to support this complex piping system in the regasification plant, Peikko provided the connections between beams and prefabricated pillars, allowing rigid constraints to be created thanks to the COPRA® systems. , BECO® and MODIX®.The same system was recently used to create the prefabricated structures of a construction site located in Milan at Cascina Merlata: this time it is a shopping center and as in the previous case, the structures were solved using Peikko systems for the beam-pillar joints. .3D schematic image of the COPRA® System and Peikko's BECO® System.In the event of an earthquake, rigid rather than flexible solutionsObtaining and finding a good behavior of buildings during a seismic event depends on several factors, among which, the most important is given by how many rigid constraints or connection nodes are present in the structure itself: the more rigid constraints there are, the more structure reacts better to the stresses acting on the pillars' bases during an earthquake, as it is able to dissipate more energy, thanks to a greater quantity of constraints and connections.The classic prefabricated structure generally includes beams hinged to the pillars and therefore has a single rigid constraint and is therefore less capable of dissipating the energy conveyed by the earthquake in the building.For this reason, traditional prefabricated structures are often oversized and made heavy, also because the beam hinged to the pillar acts only as a load and does not contribute to the strength of the frame.If, on the other hand, more rigid connections are made in different points of the structure, not only therefore at the base of the pillars, but also between the beams and the pillars, this allows energy to be dissipated also in these connections and the structure will behave better during a seismic event.Therefore, structures with more connection points can be leaner and lighter than traditional prefabricated ones with only rigid nodes between pillars and foundations.In this way, a beam rigidly connected to the pillar contributes to the behavior of the structure, it is therefore no longer just a load, but becomes a structural element that collaborates with the pillar to carry the seismic horizontal load and therefore to dissipate the energy of the seismic event.CLICK HERE - DOWNLOAD THE COPRA® SYSTEM TECHNICAL MANUAL FOR FREECLICK HERE - DOWNLOAD THE BECO® SYSTEM TECHNICAL MANUAL FOR FREEPeikko is a family business founded in 1965 with headquarters in Lahti, Finland What Peikko doesPeikko provides a wide selection of connections for concrete and composite beams, for both precast and cast-in-place solutions, for a wide range of applications.Peikko's innovative solutions make the construction process faster, safer and more effective.Our goal is to serve customers locally with cutting-edge solutions in terms of quality, safety and innovation.Peikko has a strong interest in introducing innovative and proven solutions and services.Therefore, investments in research and development are among the highest in the sector.Read also TERAJOINT® and TERAJOINT® Strong construction joints obtain CE marking Peikko steel inserts for structures: how to design and use them Bolted connections for prefabricated structures in seismic areas Innovative systems for pillar-foundation and pillar-pillar connectionsSuperbonus property located inside the property of a company: 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