PL115192B1 - Method of prestressing metal beams - Google Patents

Method of prestressing metal beams Download PDF

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Publication number
PL115192B1
PL115192B1 PL20357377A PL20357377A PL115192B1 PL 115192 B1 PL115192 B1 PL 115192B1 PL 20357377 A PL20357377 A PL 20357377A PL 20357377 A PL20357377 A PL 20357377A PL 115192 B1 PL115192 B1 PL 115192B1
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PL
Poland
Prior art keywords
screws
overlay
reinforced
tensioning
reinforced beam
Prior art date
Application number
PL20357377A
Other languages
Polish (pl)
Other versions
PL203573A1 (en
Inventor
Eugeniusz Skorka
Original Assignee
Prosynchem
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Publication date
Application filed by Prosynchem filed Critical Prosynchem
Priority to PL20357377A priority Critical patent/PL115192B1/en
Publication of PL203573A1 publication Critical patent/PL203573A1/en
Publication of PL115192B1 publication Critical patent/PL115192B1/en

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Description

Przedmiotem wynalazku jest sposób sprezania belek metalowych, majacy zastosowanie zwlaszcza tam, gdzie nie ma mozliwosci przyspawania na¬ kladki wzmacniajacej do górnego pasa belki. Zna¬ ny jest sposób sprezania belek metalowych po¬ przez mechaniczne naciaganie ciegien sprezaja¬ cych. Sposób ten w wielu przypadkach nie moze byc stosowany ze wzgledu na brak miejsca dla zalozenia urzadzen naciagowych.Bardzo czesto w istniejacych budynkach na sku¬ tek pracujacych urzadzen na stropach, nie mozna nalozyc dodatkowej nakladki na górnym pasie wzmacnianej belki. Wzmacnianie dzwigara przez zwiekszenie przekroju tylko pasa dolnego bez wstepnego sprezania daje minimalny efekt.Zadaniem technicznym do rozwiazania bylo w szczególnosci opracowanie sposobu zwiekszania nosnosci belki niezaleznie od mozliwosci stosowa¬ nia specjalnych urzadzen naciagowych.W sposobie wedlug wynalazku sprezanie belki nastepuje za pomoca nakladki sprezajacej moco¬ wanej do dolnego pasa belki. Dla sprezenia tej nakladki oraz jej zamocowania do belki, zarówno w nakladce jak i w dolnym pasie wzmacnianej belki wywierca sie otwory dla srub mocujacych i prowadzacych, laczy sie nakladke z dolnym pa¬ sem belki srubami prowadzacymi oraz mocuje z jednej strony srubami mocujacymi. Tak umoco¬ wana, z jednej strony nakladke, podgrzewa równo¬ miernie palnikiem lub promiennikiem ciepla, az 10 15 20 25 30 osiagnie on wymagane wydluzenie. Wtedy mocuje sie ja na przeciwleglym jej koncu srubami mocu¬ jacymi do pasa belki. Pomiedzy belke a nakladke wzmacniajaca, jeszcze przed ich wzajemnym po¬ laczeniem, wklada sie izolacje termiczna.Sprezenie nakladki wzmacniajacej pasa dolnego pozwala wyraznie zwiekszyc nosnosc belki, przy minimalnej zmianie wysokosci, bez koniecznosci odciazenia belki ciezarem wlasnym stropu.Przyklad. Sposób wedlug wynalazku zostal przykladowo zilustrowany na rysunku, na którym pokazano belke wzmacniana w widoku z boku.Strop 1 spoczywa na belce 2 wzmacnianej przy pomocy nakladki wzmacniajacej 4. Celem zreali¬ zowania wzmocnienia belki 2 wywiercono wpierw otwory w nakladce, a mianowicie na jej koncach dla srub mocujacych 5 oraz pomiedzy nimi dla srub prowadzacych & W dolnym pasie belki 2 wy¬ wiercono otwory dla zalozenia srub prowadza¬ cych. Nastepnie przy pomocy srub prowadzacych, polaczono nakladke z dolnym pasem belki przy czym pomiedzy te dwa elementy zalozono izolacje termiczna 3. Z kolei, poprzez otwory w nakladce wzmacniajacej wywiercono otwory dla srub mo¬ cujacych 5 na jednym koncu pasa dolnego belki wzmacnianej 2 rozwierajac je do pozadanej sred¬ nicy. Nastepnie przesunieto nakladke wzdluz osi belki o wielkosc wymaganego sprezenia i na dru¬ gim koncu belki wykonano, w sposób jak po¬ przednio, otwory dla srub mocujacych. Po za- 15 192115 192 mocowaniu nakladki na tym koncu belki srubami mocujacymi, pasowanymi przystapiono do równo¬ miernego podgrzewania nakladki przy pomocy pro¬ mienników ciepla do temperatury okolo 150 stop¬ ni C. Po uzyskaniu wymaganego wydluzenia za¬ mocowano przy pomocy srub mocujacych nakladke na przeciwleglym koncu pasa belki i po jej ostu¬ dzeniu, obciazono konstrukcje.Zastrzezenia patentowe 1. Sposób sprezania belek metalowych przy po¬ mocy nakladki laczonej z dolnym pasem belki wzmacnianej znamienny tym, ze dla polaczenia belki z nakladka i jej sprezenia zarówno w na- »5 II kTadce (4) jak i w dolnym pasie belki wzmacnia¬ nej (2) wywierca sie otwory dla srub mocujacych (5) i prowadzacych (6), laczy sie nakladke spreza¬ jaca (4) z pasem belki srubami prowadzacymi (6) craz mocuje z jednej strony srubami mocuja¬ cymi (5) a nastepnie podgrzewa nakladke równo¬ miernie tak, az osiagnie wymagane wydluzenie po czym, przy pomocy srub mocujacych (5) mo¬ cuje sie ja na przeciwleglym koncu do belki wzmacnianej (2). 2. Sposób wzmacniania belek wedlug zastrz. 1, znamienny tym, ze pomiedzy dolnym pasem belki wzmacnianej (2) a nakladka sprezajaca (4) umiesz- cza sie izolacja termiczna (3).N k: Bltk 380/82 110 egz. A4 Cena 45 zl PLThe subject of the invention is a method of stressing metal beams, which is used especially where it is not possible to weld a reinforcing flange to the top flange of the beam. There is a known method of stressing metal beams by mechanical tensioning of tension cables. This method in many cases cannot be used due to the lack of space for the installation of the tensioning devices. Very often in existing buildings, due to the devices working on the ceilings, no additional overlay can be applied on the upper strip of the reinforced beam. Strengthening the spar by increasing the cross-section of only the lower flange without pre-tensioning gives a minimal effect. The technical task of the solution was in particular to develop a method of increasing the load-bearing capacity of the beam, regardless of the possibility of using special tensioning devices. down to the bottom flange of the beam. In order to compress this cover and to fix it to the beam, holes are drilled both in the cover and in the lower strip of the reinforced beam, the cover is connected to the lower strip of the beam with guide screws and fastened on one side with fastening screws. The cover, thus fastened on one side, is evenly heated by a burner or a heat radiator until it reaches the required elongation. Then it is fastened at the opposite end with fastening screws to the beam flange. Thermal insulation is inserted between the beam and the reinforcement pad, even before their mutual connection. The pre-tensioning of the bottom chord reinforcement pad allows you to significantly increase the load-bearing capacity of the beam, with minimal change in height, without the need to unload the beam with the slab's own weight. The method according to the invention is illustrated, for example, in the drawing, which shows the reinforcement beam in a side view. The ceiling 1 rests on a beam 2 reinforced with a reinforcement plate 4. To reinforce the beam 2, holes were first drilled in the cover plate, namely at its ends. for the fastening bolts 5 and between them for the guide bolts & Holes are drilled in the lower strip of the beam 2 for inserting the guide bolts. Then, with the help of guide screws, the overlay was connected to the lower beam of the beam, with thermal insulation 3 being placed between these two elements. In turn, through the holes in the reinforcing overlay, holes were drilled for fastening screws 5 at one end of the lower flange of the reinforced beam 2, opening them to desired diameter. Then the pad was moved along the axis of the beam by the amount of the required tension, and at the other end of the beam, holes were made for the fastening bolts in the same way. After fixing the cover plate at this end of the beam with fitting screws, the cover plate was heated evenly by means of heat exchangers to a temperature of about 150 degrees C. After obtaining the required elongation, the cover plate was fastened with the help of screws. at the opposite end of the beam flange and after it has been cooled, the structure was loaded. Patent claims 1. Method of compressing metal beams with the use of an overlay connected to the lower beam of the reinforced beam, characterized by the fact that for connecting the beam with the overlay and its tension both on the »5 II caddy (4) and in the lower flange of the reinforced beam (2), holes are drilled for the fastening (5) and guide screws (6), the tensioning plate (4) is connected with the beam flange with guide screws (6) Craz is fastened on one side with fixing screws (5) and then heats the overlay evenly until it reaches the required elongation and then, with the help of fixing screws (5), it is attached to the opposite end to the reinforced beam (2). 2. Method of reinforcing beams according to claim 1, characterized in that a thermal insulation (3) is located between the lower flange of the reinforced beam (2) and the tensioning plate (4). N k: Bltk 380/82 110 copy A4 Price PLN 45 PL

Claims (2)

Zastrzezenia patentowe 1. Sposób sprezania belek metalowych przy po¬ mocy nakladki laczonej z dolnym pasem belki wzmacnianej znamienny tym, ze dla polaczenia belki z nakladka i jej sprezenia zarówno w na- »5 II kTadce (4) jak i w dolnym pasie belki wzmacnia¬ nej (2) wywierca sie otwory dla srub mocujacych (5) i prowadzacych (6), laczy sie nakladke spreza¬ jaca (4) z pasem belki srubami prowadzacymi (6) craz mocuje z jednej strony srubami mocuja¬ cymi (5) a nastepnie podgrzewa nakladke równo¬ miernie tak, az osiagnie wymagane wydluzenie po czym, przy pomocy srub mocujacych (5) mo¬ cuje sie ja na przeciwleglym koncu do belki wzmacnianej (2).Claims 1. Method of compressing metal beams by means of an overlay connected to the lower flange of the reinforced beam, characterized in that for connecting the beam to the overlay and its tensioning both in the sleeve (4) and in the lower flange of the reinforced beam (2) holes are drilled for the fastening screws (5) and guide screws (6), the tensioning plate (4) is connected to the beam belt with guide screws (6), and fixed on one side with the fastening screws (5) and then heated the overlay is evenly achieved until it reaches the required elongation, then it is attached at the opposite end to the reinforced beam (2) by means of the fastening screws (5). 2. Sposób wzmacniania belek wedlug zastrz. 1, znamienny tym, ze pomiedzy dolnym pasem belki wzmacnianej (2) a nakladka sprezajaca (4) umiesz- cza sie izolacja termiczna (3). N k: Bltk 380/82 110 egz. A4 Cena 45 zl PL2. Method of reinforcing beams according to claim A method as claimed in claim 1, characterized in that a thermal insulation (3) is provided between the lower strip of the reinforced beam (2) and the tensioning plate (4). Number: Bltk 380/82 110 copies A4 Price PLN 45 PL
PL20357377A 1977-12-29 1977-12-29 Method of prestressing metal beams PL115192B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL20357377A PL115192B1 (en) 1977-12-29 1977-12-29 Method of prestressing metal beams

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL20357377A PL115192B1 (en) 1977-12-29 1977-12-29 Method of prestressing metal beams

Publications (2)

Publication Number Publication Date
PL203573A1 PL203573A1 (en) 1979-08-13
PL115192B1 true PL115192B1 (en) 1981-03-31

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PL20357377A PL115192B1 (en) 1977-12-29 1977-12-29 Method of prestressing metal beams

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PL203573A1 (en) 1979-08-13

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