CA1251321A - Joint connection for girders - Google Patents
Joint connection for girdersInfo
- Publication number
- CA1251321A CA1251321A CA000464922A CA464922A CA1251321A CA 1251321 A CA1251321 A CA 1251321A CA 000464922 A CA000464922 A CA 000464922A CA 464922 A CA464922 A CA 464922A CA 1251321 A CA1251321 A CA 1251321A
- Authority
- CA
- Canada
- Prior art keywords
- joint
- pipe
- pipes
- end portions
- threaded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B1/1903—Connecting nodes specially adapted therefor
- E04B1/1906—Connecting nodes specially adapted therefor with central spherical, semispherical or polyhedral connecting element
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B2001/1924—Struts specially adapted therefor
- E04B2001/1927—Struts specially adapted therefor of essentially circular cross section
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B2001/1957—Details of connections between nodes and struts
- E04B2001/196—Screw connections with axis parallel to the main axis of the strut
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B2001/1981—Three-dimensional framework structures characterised by the grid type of the outer planes of the framework
- E04B2001/1984—Three-dimensional framework structures characterised by the grid type of the outer planes of the framework rectangular, e.g. square, grid
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Joining Of Building Structures In Genera (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Reinforcement Elements For Buildings (AREA)
- Bridges Or Land Bridges (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention relates to a joint connection for girders having more than two members connected in a joint, in particular for steel structures.
The members are formed as circular pipes and the ends of the circular pipes converging in a joint are attached to one each joint element by means of screw connections arranged in the axis of the pipe. The ends of the pipes, without reduction of their cross section and flexural strength, are provided with an external thread whose core diameter is at least equal to the outer diameter of the circular pipes. On this external thread, a union nut slidable over the circular pipe is screwable by means of its internal thread and the union nut can also be screwed down on the joint element.
The joint elements are preferably hollow and formed with openings extending along the axes of the adjacent circular pipes. It is possible to provide a girder which is filled with a liquid such as water with which it communciates via the joint elements and is connected to a liquid cycle.
The invention relates to a joint connection for girders having more than two members connected in a joint, in particular for steel structures.
The members are formed as circular pipes and the ends of the circular pipes converging in a joint are attached to one each joint element by means of screw connections arranged in the axis of the pipe. The ends of the pipes, without reduction of their cross section and flexural strength, are provided with an external thread whose core diameter is at least equal to the outer diameter of the circular pipes. On this external thread, a union nut slidable over the circular pipe is screwable by means of its internal thread and the union nut can also be screwed down on the joint element.
The joint elements are preferably hollow and formed with openings extending along the axes of the adjacent circular pipes. It is possible to provide a girder which is filled with a liquid such as water with which it communciates via the joint elements and is connected to a liquid cycle.
Description
~2~;~3~L
The invention relates to a ~oint connection for girders having more than two members connected in one joint, in particular for steel structures, whose members are formed as circular pipes, with the ends of the circular pipes con-verging in a joint being attachable to one each joint element by means of screw connections arranged in the axis of the pipe.
Xnown joints of this type have the advantage that the members transmit the traction and compression forces exclu~ively mathem-atically precisely into the center of the joint connections. The circular pipes functioning as members terminate on welded frustrums with an a~ a~ial bore. A screw bolt supported on the frustrum with its head inside of the pipe is screwable by means of a thread provided on its front end into the bore of a joint element made of solid material and projects outward through the bore. A pipe or sleeve element penetrated by -the shaft of the screw bolt is arranged between -the frustrum and the joint element. The slee~e element is connected to the shaft o~ the bolt in such a manner that the shaft can slide within the sleeve element, but no-t rotate in relation to it.
The screw connection between the circular pipe and the joint element can thus be made or released by turning the screw bolt b~ means of the sleeve part.
Still, the joint connection described has many disadvantages.
It is elaborate due to the large number of metal parts to be processed.The welding connection between circular pipe and fruStrum is a weak spot and the strength of the circular pipes can thus not be made ~ull use of. The high-strength screw bolts themselves ara 3ubject to notch tension and thus do not create a rigid, but ins-taad ~ sor-t of articulate connection between the member3 and the joint element~, as their core cro~s sections act a~ flow links in case of bending of the members. When measur-_2 ing the members, the full buckling length up to the thread atthe front end of the screw bolts must be calculated. The inherent rigidity of the girder is low r~he insertion of the screw bolts necessitates assembling holes in the pipes which in turn call ~or oppositely disposed drainage holes and thus locally weaken the cross section of -the pipe. The inner walls of the pipes are un-controllably subject to corrosion and pro-tection of the pipes against the in-fluence of heat in the event of fire is hardly possible. ~he fireproofness is thus not adequate, particularly in the case OL halls in which many people congregate or airplanes are kept.
It is the object of the inven-tion to provide a rigid joint connection without weak-ening of the more than two members connected in one joint which is free of the disadvantages mentioned and requires a less elaborate produc-tion process. In a joint connection of the type initially mentioned, the invention resides in that -the ends of the circular pipes, without any reduction of their cross section and flexural strength, are provided with an external thread ~hose core diarneter is at least equal to the outer diameter of the circular pipes, that a union nu-t slidable or rotatable over the circular pipe is screwable by means of its interior thread onto the external -thread and that the union nut can moreover be screwed down on the joint elernent. rrhiS creates a rigid connection between circular pipes and joint element. I-t is also possible to fill the hollow spaces communicatingly connected via the joint elements with a liquid such as wa-ter, under addition of anticorrosives and optionally antifreeze agents and to utilize the liquid for heating, cooling and/or fire extinguishing in the event of fire 7 for the s-torage of solar energy or the like.
L32~
In an advanta~eous embodiment of the joint connection accordirg to the invention~ the union nut is screwable with the front por-tion of its interior thread onto a corresponding outer thread of the joint element. In the case of a liquid-filled girder, it is possible to arrange a sealing ring which optionally acts as a cross-section-reducing throttle (screen) in the gap between the ends of the circular pipes and the portion of the joint element provided with the external thread, so as to influence the ~low thro-~gh the pipe system formed of the circular pipes by means of this sealing ring.
In another, most favorable embodiment of the joint eonnection according to the invention, the union nu-t is screwable by its external -thread into a corresponding interior thread of the joint element 9 the interior thread ar.d the exterior thread of the union nut being of the same pi-tch and concentrically arrangedO
In this, the interior thread and the exterior thread of the union nut are preferably arranged along its same longitudinal portion, with the circular pipes connected to a joint projecting into the joint element.
I-t is practical -to provide a union nut formed as a sleeve with helically extending, undula-ting cross section. The union nut formed as such a sleeve is advantageously provided on its rear end with a ring projecting outward, which ring, - in the case of a girder filled with liquid, - presses via an outer sealing ring against the portion of -the joint element provided with the interior thread and seals the interior -thread of the union nut and the circular pipe via an inner sealing ring.
~.25~3~2~
The union nut with interior and exterior threads provided along the same longitudinal portion can also be formed as a spiral (helix); in the case of a liquid-filled girder, the gap between the spiral windin~s can be filled with a sealing mass in the zone in which the circular pipe projec-ts into the joint element.
The union nut provided with the interior and exterior thread along the same longitudinal por-lion can also be formed as a sleeve with a spiral (helix) inserted or cast into it.
The spiral can be composed in cross section o~ two differently profiled wire halves~
In the case of the liquid-filled girder, the joint elements are hollow and formed with openings extending along the axes of the adjacent circular pipes. It is practical to dimension the diameter of the openings of the joint elements to be at leas-t equal to the inner diameter of the circular pipes~ The exterior thread can be formed onto the ends of the circular pipes by plastic deformation such as pressing, upsetting and/
or rolling.
But the exterior thread can also be cut into the ends of -the walls of -the circular pipes thickened by upsetting.
I-t is also possible to attach the exterior -thread to the ends of the circular pipes by welding, such as build-up welding or resistanoe pressure welding of a profiled wire spiral.
A girder provided with the joint connection according -to the invention is advan-tageously filled with a liquid such as water communicating via the joint elemen-ts and connected to a liquid cycle.
~25~3~
21950-1~
The joint elements and/or circular pipes can be provided with valves which open, such as in case of fire, in reac-tion to super pressure and/or excess temperature, whereby the source of -fire or the girder can be sprayed with water similar to a sprinkler systeM and the pipe walls can be cooled by the flow thus created in the pipe.
Accordingly, the present invention provides a joint connection for a girder assembly, the joint connection including a joint element and a plurality of pipes which converge toward and are connected to the joint element, the joint element being provided with at least three exteriorly threaded portions protruding therefrom in different directions, the exteriorly threaded portions having exterior surfaces which are threaded.
Each of said pipes is a member which is circular in cross sec-tion and has an unthreaded longitudinal section with threaded end portions at its opposite ends, each said pipe having its threaded end portions and its longitudinal section inseparably ~ormed together as a unitary structure, the threaded end portions having exterior threads, the exterior -threads on each ~0 pipe having a core diameter which is no less than the exterior diameter of the longitudinal section of the respec-tive pipe.
The threaded end portions of each pipe have cross sections which are not reduced in size or strength rela-tive to the cross section o-f the longi-tudinal section of the respective pipe, and union nu-ts which have interior threads engaged with the exterior threads of -the pipes. Each of the union nuts has a threaded front portion which is screwed onto an exteriorly threaded portion o~ the joint element, the union nuts being rotatable on the exterior threads of said pipes and bearing against ~he joint element.
~2~;~;3 2~
The invention is explained in detail by means of embodiments o~ joint connections accordin~ to the invention and a girder composed thereof, under reference to the accompanying drawings.
Figure 1 shows a girder in slant view from the top;
Figure 2 shows a detail of a joint connection, namely a joint element in simplified representation;
Figures 3 to 6 show various e~bodiments of the ends of circular pipes attached to the joint element according to Figure
The invention relates to a ~oint connection for girders having more than two members connected in one joint, in particular for steel structures, whose members are formed as circular pipes, with the ends of the circular pipes con-verging in a joint being attachable to one each joint element by means of screw connections arranged in the axis of the pipe.
Xnown joints of this type have the advantage that the members transmit the traction and compression forces exclu~ively mathem-atically precisely into the center of the joint connections. The circular pipes functioning as members terminate on welded frustrums with an a~ a~ial bore. A screw bolt supported on the frustrum with its head inside of the pipe is screwable by means of a thread provided on its front end into the bore of a joint element made of solid material and projects outward through the bore. A pipe or sleeve element penetrated by -the shaft of the screw bolt is arranged between -the frustrum and the joint element. The slee~e element is connected to the shaft o~ the bolt in such a manner that the shaft can slide within the sleeve element, but no-t rotate in relation to it.
The screw connection between the circular pipe and the joint element can thus be made or released by turning the screw bolt b~ means of the sleeve part.
Still, the joint connection described has many disadvantages.
It is elaborate due to the large number of metal parts to be processed.The welding connection between circular pipe and fruStrum is a weak spot and the strength of the circular pipes can thus not be made ~ull use of. The high-strength screw bolts themselves ara 3ubject to notch tension and thus do not create a rigid, but ins-taad ~ sor-t of articulate connection between the member3 and the joint element~, as their core cro~s sections act a~ flow links in case of bending of the members. When measur-_2 ing the members, the full buckling length up to the thread atthe front end of the screw bolts must be calculated. The inherent rigidity of the girder is low r~he insertion of the screw bolts necessitates assembling holes in the pipes which in turn call ~or oppositely disposed drainage holes and thus locally weaken the cross section of -the pipe. The inner walls of the pipes are un-controllably subject to corrosion and pro-tection of the pipes against the in-fluence of heat in the event of fire is hardly possible. ~he fireproofness is thus not adequate, particularly in the case OL halls in which many people congregate or airplanes are kept.
It is the object of the inven-tion to provide a rigid joint connection without weak-ening of the more than two members connected in one joint which is free of the disadvantages mentioned and requires a less elaborate produc-tion process. In a joint connection of the type initially mentioned, the invention resides in that -the ends of the circular pipes, without any reduction of their cross section and flexural strength, are provided with an external thread ~hose core diarneter is at least equal to the outer diameter of the circular pipes, that a union nu-t slidable or rotatable over the circular pipe is screwable by means of its interior thread onto the external -thread and that the union nut can moreover be screwed down on the joint elernent. rrhiS creates a rigid connection between circular pipes and joint element. I-t is also possible to fill the hollow spaces communicatingly connected via the joint elements with a liquid such as wa-ter, under addition of anticorrosives and optionally antifreeze agents and to utilize the liquid for heating, cooling and/or fire extinguishing in the event of fire 7 for the s-torage of solar energy or the like.
L32~
In an advanta~eous embodiment of the joint connection accordirg to the invention~ the union nut is screwable with the front por-tion of its interior thread onto a corresponding outer thread of the joint element. In the case of a liquid-filled girder, it is possible to arrange a sealing ring which optionally acts as a cross-section-reducing throttle (screen) in the gap between the ends of the circular pipes and the portion of the joint element provided with the external thread, so as to influence the ~low thro-~gh the pipe system formed of the circular pipes by means of this sealing ring.
In another, most favorable embodiment of the joint eonnection according to the invention, the union nu-t is screwable by its external -thread into a corresponding interior thread of the joint element 9 the interior thread ar.d the exterior thread of the union nut being of the same pi-tch and concentrically arrangedO
In this, the interior thread and the exterior thread of the union nut are preferably arranged along its same longitudinal portion, with the circular pipes connected to a joint projecting into the joint element.
I-t is practical -to provide a union nut formed as a sleeve with helically extending, undula-ting cross section. The union nut formed as such a sleeve is advantageously provided on its rear end with a ring projecting outward, which ring, - in the case of a girder filled with liquid, - presses via an outer sealing ring against the portion of -the joint element provided with the interior thread and seals the interior -thread of the union nut and the circular pipe via an inner sealing ring.
~.25~3~2~
The union nut with interior and exterior threads provided along the same longitudinal portion can also be formed as a spiral (helix); in the case of a liquid-filled girder, the gap between the spiral windin~s can be filled with a sealing mass in the zone in which the circular pipe projec-ts into the joint element.
The union nut provided with the interior and exterior thread along the same longitudinal por-lion can also be formed as a sleeve with a spiral (helix) inserted or cast into it.
The spiral can be composed in cross section o~ two differently profiled wire halves~
In the case of the liquid-filled girder, the joint elements are hollow and formed with openings extending along the axes of the adjacent circular pipes. It is practical to dimension the diameter of the openings of the joint elements to be at leas-t equal to the inner diameter of the circular pipes~ The exterior thread can be formed onto the ends of the circular pipes by plastic deformation such as pressing, upsetting and/
or rolling.
But the exterior thread can also be cut into the ends of -the walls of -the circular pipes thickened by upsetting.
I-t is also possible to attach the exterior -thread to the ends of the circular pipes by welding, such as build-up welding or resistanoe pressure welding of a profiled wire spiral.
A girder provided with the joint connection according -to the invention is advan-tageously filled with a liquid such as water communicating via the joint elemen-ts and connected to a liquid cycle.
~25~3~
21950-1~
The joint elements and/or circular pipes can be provided with valves which open, such as in case of fire, in reac-tion to super pressure and/or excess temperature, whereby the source of -fire or the girder can be sprayed with water similar to a sprinkler systeM and the pipe walls can be cooled by the flow thus created in the pipe.
Accordingly, the present invention provides a joint connection for a girder assembly, the joint connection including a joint element and a plurality of pipes which converge toward and are connected to the joint element, the joint element being provided with at least three exteriorly threaded portions protruding therefrom in different directions, the exteriorly threaded portions having exterior surfaces which are threaded.
Each of said pipes is a member which is circular in cross sec-tion and has an unthreaded longitudinal section with threaded end portions at its opposite ends, each said pipe having its threaded end portions and its longitudinal section inseparably ~ormed together as a unitary structure, the threaded end portions having exterior threads, the exterior -threads on each ~0 pipe having a core diameter which is no less than the exterior diameter of the longitudinal section of the respec-tive pipe.
The threaded end portions of each pipe have cross sections which are not reduced in size or strength rela-tive to the cross section o-f the longi-tudinal section of the respective pipe, and union nu-ts which have interior threads engaged with the exterior threads of -the pipes. Each of the union nuts has a threaded front portion which is screwed onto an exteriorly threaded portion o~ the joint element, the union nuts being rotatable on the exterior threads of said pipes and bearing against ~he joint element.
~2~;~;3 2~
The invention is explained in detail by means of embodiments o~ joint connections accordin~ to the invention and a girder composed thereof, under reference to the accompanying drawings.
Figure 1 shows a girder in slant view from the top;
Figure 2 shows a detail of a joint connection, namely a joint element in simplified representation;
Figures 3 to 6 show various e~bodiments of the ends of circular pipes attached to the joint element according to Figure
2;
Figure 7 shows a joint connection in cross section;
Figure 8 shows another embodiment of a joint connection also in cross section and Figure 9 shows a detail of the joint connection according to E'igure 8, namely a union nut, in an embodiment different from that shown in Figure 8.
Figure 1 shows a girder in the form of a typical two-layered spatial trussed structure consisting of joint elements 1 and members formed of circular pipes 2, in simplified representationO The ~oint elements 1 and circular pipes 2 form a communicating liquid system with their hollow spaces. The liquid system is connected to a liquid cycle via inlet lines 3 arranged on the corners of the spatial trussed structure and recirculating lines 4 disposed in the center of the spatial trussed structure. A liquid container 5, a branch-off valve 6 and a pump 7 are provided in the liquid cycle.
- ~a -
Figure 7 shows a joint connection in cross section;
Figure 8 shows another embodiment of a joint connection also in cross section and Figure 9 shows a detail of the joint connection according to E'igure 8, namely a union nut, in an embodiment different from that shown in Figure 8.
Figure 1 shows a girder in the form of a typical two-layered spatial trussed structure consisting of joint elements 1 and members formed of circular pipes 2, in simplified representationO The ~oint elements 1 and circular pipes 2 form a communicating liquid system with their hollow spaces. The liquid system is connected to a liquid cycle via inlet lines 3 arranged on the corners of the spatial trussed structure and recirculating lines 4 disposed in the center of the spatial trussed structure. A liquid container 5, a branch-off valve 6 and a pump 7 are provided in the liquid cycle.
- ~a -
3~
A heat exchanger 8 serving as a heater, cooler or for the recovery o~ solar energy can be fed Yia a bypass line l~ading from the branch-off val~e 6 to the pump 7. I~ the heat exchanger is used as a heater9 the pump 7 can be operated via a heat control, in the event of fire, it can be operated via a fire alarm device or by means of a float-type switch, in the event of loss of liquid~ by opening of one of the temperature- and pressure-dependent valves in -the network. Losse5 in the liquid system can be replaced from the local water line via an automatic valve 9 controlled by the level of the liquid container 5. The liquid used can be water with additions of anticorrosives and anti-freeze agents.
Fig. 2 shows one of the joint elements bearing the reference number 1 in Fig. 1. Each one of the Fig. 3 to 6 shows an end of a circular pipe 2 provided with an exterior thread 13 and connected to the joint element. The exterior thread 10 in Fig. 3 is formed by pressing, the exterior thread in Fig. 4 is formed by upsetting and rolling or by cutting into the upse-t end of the pipe. The exterior thread 10 shown in Fig. 5 is formed by build-up welding on the end of the pipe 2. According to Fig. 6, the exterior thread 10 i5 welded onto the end of the circular pipe 2 in the form of a spiral (helix) of profiled wire~ for instance by means or resistance pr0ssure welding. In all cases, the core diameter d1 of the exterior thread 10 is at leas-t equal to the outer diameter D of the circular pipe 2, the cross section of the pipe remains unreduced.
Fig~ 7 shows a joint connection in cross section at enlarged scale. ~his figure shows how the end of a circular pipe 2 provided with an exterior thread 10 is attached to the joint element 1; a union nut 11 slidable or screwable over the ~,5~3f~
cicular pipe 2 is screwed by means of its interior thread 12 onto the exterior thread 10. The union nut is simult~neously screwed with the front portion of its interior thread 12 onto a corresponding exterior thread 13 of the joint elem0nt 1. A sealing ring 14 is provided in the gap between the ends of the circular pipe 2 and the portion of the joint element 1 provided with the exterior thread 13. One of the sealing rings 14 shown in Fig. 7 is formed as a cross-section-reducing throttle for influencing the flow in the system. I`he reference number 15 indicates a valve attached to the joint element l this valve can serve for ventilation or as a superpressure or excess temperature valve and is represented in de-tail in Fig. 8.
Fig. 8, also in enlarged scale, shows another embodiment of the joint connection according to -the invention9 with two different types of union nuts 16 and 17. In both cases, the union nut 16 or 17 is screwed by means of an exterior thread 18 or 19 provided on it into a corresponding interior thread 20 or 21 of the joint element 1. The interior thread bearing the reference numbers 22 and 23 in this case and the exterior thread lo and 19 of the union nut 16 and 17 are arranged with the same pitch, concentrically and along the same longitudinal portion of it. A particularly strong connection is achieved by the fact that -the circular pipes 2 connected to a join-t projec-t into the joint element 1.
The union nut 16 shown in Fig. 8 is formed as a sleeve with a helically extending, undula-ting cross section. It is provided on its rear end with a ring 24 projectint outward.
The ring 24 presses against the end of the portion of -the joint element 1 provided with -the interior thread 20 via an outer sealing ring 25. Moreover, an inner sealing ring 26 seals -the i~erior-----~------------------_-_-_-___________ thread 22 and -the circular pipe 2.
The union rlu-t 17 sho~n in ~ig. 8 is formed as a spiral (helix). After screwing the union nut 17 formed as a spiral into the gap between the interior thread 21 of the joint element 1 and the exterior thread 10 of-the circular pipe 2 the gap between the spiral windings of the union nut 17 ~as filled by injecting a sealing mass 26.
Fig. 9 shows a further embodiment of a union nut 27~ formed as a sleeve with a spiral (helix) 28 inserted in it. The spiral 28 can be composed of two differently profiled wire halves in cross section.
In the joint connections according to Fig. 7 and 89 the joint elements 1 are hollow and provided with openings 30 extending along the axes of the adjacent circular pipes 2. The diameter of the openings 30 is at least equal to the inner diameter d of the circular pipes 2.
~ ig. 8 further shows a valve 15 adjacen-t circular pipe 2. A
valve pipe 31 in which a valve body 33 loaded by means of a pressure spring 32 is disposed is screwed into the circular pipe 2. ~he pressure spring 32 presses on the other end onto a platelet 34 of fusible solder which makes way for pressure spring 32 and valve body 33 at correspondingly high temperatures so -that the water can flow out on top of -the valve pie 31. The valve pipe 31 is further provided wi-th lateral orifices 35 through which the wa-ter can flow no-t only in case of the melting of the pla-telet 34, but also in the event that the pressure in the fluid sys-tem reaches so high a value tha-t forces the valve body upward to the orifices 35 against the force of the pressure spring 32. A cross-sec-tion-reducing throttle (screen) is inserted in the circular pipe 2 and bears the reference number 36~ in this embodiment, it replaces the sealing ring 14 acting as a thro-ttle shown in Fig. 7.
_g_ 3~
~ he joint connection according to the invention is suitable for ~irder~ of all types, in pPrticular ~or three~dimensional girders9 multiple chord truss girders, truss plateR, barrels and folded plates9 one-layered and multipl~-layered truss cupolas, girder cupolas, steel deckings and plane load-bearing structures.
A heat exchanger 8 serving as a heater, cooler or for the recovery o~ solar energy can be fed Yia a bypass line l~ading from the branch-off val~e 6 to the pump 7. I~ the heat exchanger is used as a heater9 the pump 7 can be operated via a heat control, in the event of fire, it can be operated via a fire alarm device or by means of a float-type switch, in the event of loss of liquid~ by opening of one of the temperature- and pressure-dependent valves in -the network. Losse5 in the liquid system can be replaced from the local water line via an automatic valve 9 controlled by the level of the liquid container 5. The liquid used can be water with additions of anticorrosives and anti-freeze agents.
Fig. 2 shows one of the joint elements bearing the reference number 1 in Fig. 1. Each one of the Fig. 3 to 6 shows an end of a circular pipe 2 provided with an exterior thread 13 and connected to the joint element. The exterior thread 10 in Fig. 3 is formed by pressing, the exterior thread in Fig. 4 is formed by upsetting and rolling or by cutting into the upse-t end of the pipe. The exterior thread 10 shown in Fig. 5 is formed by build-up welding on the end of the pipe 2. According to Fig. 6, the exterior thread 10 i5 welded onto the end of the circular pipe 2 in the form of a spiral (helix) of profiled wire~ for instance by means or resistance pr0ssure welding. In all cases, the core diameter d1 of the exterior thread 10 is at leas-t equal to the outer diameter D of the circular pipe 2, the cross section of the pipe remains unreduced.
Fig~ 7 shows a joint connection in cross section at enlarged scale. ~his figure shows how the end of a circular pipe 2 provided with an exterior thread 10 is attached to the joint element 1; a union nut 11 slidable or screwable over the ~,5~3f~
cicular pipe 2 is screwed by means of its interior thread 12 onto the exterior thread 10. The union nut is simult~neously screwed with the front portion of its interior thread 12 onto a corresponding exterior thread 13 of the joint elem0nt 1. A sealing ring 14 is provided in the gap between the ends of the circular pipe 2 and the portion of the joint element 1 provided with the exterior thread 13. One of the sealing rings 14 shown in Fig. 7 is formed as a cross-section-reducing throttle for influencing the flow in the system. I`he reference number 15 indicates a valve attached to the joint element l this valve can serve for ventilation or as a superpressure or excess temperature valve and is represented in de-tail in Fig. 8.
Fig. 8, also in enlarged scale, shows another embodiment of the joint connection according to -the invention9 with two different types of union nuts 16 and 17. In both cases, the union nut 16 or 17 is screwed by means of an exterior thread 18 or 19 provided on it into a corresponding interior thread 20 or 21 of the joint element 1. The interior thread bearing the reference numbers 22 and 23 in this case and the exterior thread lo and 19 of the union nut 16 and 17 are arranged with the same pitch, concentrically and along the same longitudinal portion of it. A particularly strong connection is achieved by the fact that -the circular pipes 2 connected to a join-t projec-t into the joint element 1.
The union nut 16 shown in Fig. 8 is formed as a sleeve with a helically extending, undula-ting cross section. It is provided on its rear end with a ring 24 projectint outward.
The ring 24 presses against the end of the portion of -the joint element 1 provided with -the interior thread 20 via an outer sealing ring 25. Moreover, an inner sealing ring 26 seals -the i~erior-----~------------------_-_-_-___________ thread 22 and -the circular pipe 2.
The union rlu-t 17 sho~n in ~ig. 8 is formed as a spiral (helix). After screwing the union nut 17 formed as a spiral into the gap between the interior thread 21 of the joint element 1 and the exterior thread 10 of-the circular pipe 2 the gap between the spiral windings of the union nut 17 ~as filled by injecting a sealing mass 26.
Fig. 9 shows a further embodiment of a union nut 27~ formed as a sleeve with a spiral (helix) 28 inserted in it. The spiral 28 can be composed of two differently profiled wire halves in cross section.
In the joint connections according to Fig. 7 and 89 the joint elements 1 are hollow and provided with openings 30 extending along the axes of the adjacent circular pipes 2. The diameter of the openings 30 is at least equal to the inner diameter d of the circular pipes 2.
~ ig. 8 further shows a valve 15 adjacen-t circular pipe 2. A
valve pipe 31 in which a valve body 33 loaded by means of a pressure spring 32 is disposed is screwed into the circular pipe 2. ~he pressure spring 32 presses on the other end onto a platelet 34 of fusible solder which makes way for pressure spring 32 and valve body 33 at correspondingly high temperatures so -that the water can flow out on top of -the valve pie 31. The valve pipe 31 is further provided wi-th lateral orifices 35 through which the wa-ter can flow no-t only in case of the melting of the pla-telet 34, but also in the event that the pressure in the fluid sys-tem reaches so high a value tha-t forces the valve body upward to the orifices 35 against the force of the pressure spring 32. A cross-sec-tion-reducing throttle (screen) is inserted in the circular pipe 2 and bears the reference number 36~ in this embodiment, it replaces the sealing ring 14 acting as a thro-ttle shown in Fig. 7.
_g_ 3~
~ he joint connection according to the invention is suitable for ~irder~ of all types, in pPrticular ~or three~dimensional girders9 multiple chord truss girders, truss plateR, barrels and folded plates9 one-layered and multipl~-layered truss cupolas, girder cupolas, steel deckings and plane load-bearing structures.
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A joint connection for a girder assembly, said joint connection including a joint element and a plurality of pipes which converge toward and are connected to said joint element, said joint element being provided with at least three exteriorly threaded portions protruding therefrom in different directions, said exteriorly threaded portions having exterior surfaces which are threaded, each of said pipes being a member which is circular in cross section and has an unthreaded longitudinal section with threaded end portions at its opposite ends, each said pipe having its threaded end portions and its said longitudinal section inseparably formed together as a unitary structure, said threaded end portions having exterior threads, said exterior threads on each pipe having a core diameter which is no less than the exterior diameter of the longitudinal section of the respective pipe, said threaded end portions of each pipe having cross sections which are not reduced in size or strength relative to the cross section of the longitudinal section of the respective pipe, and union nuts which have interior threads engaged with the exterior threads of the pipes, each of said union nuts having a threaded front portion which is screwed onto an exteriorly threaded portion of the joint element, said union nuts being rotatably on said exterior threads of said pipes and bearing against the joint element.
2. The joint connection according to claim 1 having a sealing ring located in an axial space between the end portion of the pipe and the exteriorly threaded portion of the joint element.
3. The joint connection according to claim 1 wherein the joint elements are hollow and provided with openings aligned with the axes of the pipes.
4. The joint connection according to claim 3 wherein the diameters of the openings of the joint elements are at least equal to the inner diameters of the respective pipes.
5. The joint connection according to claim 1, wherein the end portions of a said pipe have a uniform thickness which is equal to the thickness of the longitudinal section, said end portions being deformed to provide the exterior threads on the end portions of the pipe.
6. The joint connection according to claim 1, wherein the end portions of the pipe have a maximum thickness which is thicker than the thickness of the longitudinal section, and the exterior threads are formed in said end portions.
7. The joint connection according to claim 1, wherein the exterior threads formed on said threaded end portions of the pipes are profiled wire spirals welded on the pipes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT3605/83 | 1983-10-10 | ||
| AT0360583A AT379190B (en) | 1983-10-10 | 1983-10-10 | NODE CONNECTION FOR RODWORKS AND RODWORK WITH SUCH NODE CONNECTIONS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1251321A true CA1251321A (en) | 1989-03-21 |
Family
ID=3552831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000464922A Expired CA1251321A (en) | 1983-10-10 | 1984-10-09 | Joint connection for girders |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0137429B1 (en) |
| JP (1) | JPS60238548A (en) |
| AT (2) | AT379190B (en) |
| CA (1) | CA1251321A (en) |
| DE (1) | DE3481721D1 (en) |
| ZA (1) | ZA847862B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0267914A4 (en) * | 1985-08-16 | 1989-01-24 | Garry Randall Hart | Adjustable space frames. |
| DE3629135A1 (en) * | 1986-08-27 | 1988-03-10 | Grimm Friedrich Bjoern | NODE ROD SYSTEM |
| DE4228238C2 (en) * | 1992-08-25 | 1996-08-14 | Ges Innenhochdruckverfahren | Truss with hollow parts, process for its production and its use |
| CN103184768A (en) * | 2013-01-22 | 2013-07-03 | 北京工业大学 | Screw thread sleeve joint for detachable grid structure |
| CN103898991A (en) * | 2014-04-10 | 2014-07-02 | 北京工业大学 | Sleeve-type pipe node |
| CN107953059B (en) * | 2018-01-04 | 2024-05-07 | 中建二局安装工程有限公司 | Intersecting line rod piece angle adjusting device and pipe truss embedded rod piece construction method |
| CN113404164A (en) * | 2021-06-30 | 2021-09-17 | 郑州宝冶钢结构有限公司 | Method for installing steel pipe truss through pipe fitting through sleeve |
| CN113788164B (en) * | 2021-09-14 | 2022-09-02 | 哈尔滨理工大学 | Space truss connecting device with bidirectional locking function |
| CN113914460A (en) * | 2021-09-28 | 2022-01-11 | 山东经典建筑研究院有限公司 | Large-span repairable assembly type node and assembly method |
| CN115853119B (en) * | 2022-12-17 | 2023-07-28 | 杭州旭翔实业有限公司 | Prefabricated assembled light steel structure factory building |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB395931A (en) * | 1932-11-30 | 1933-07-27 | Alexander Herman | A metal frame-unit for constructional purposes |
| US2578364A (en) * | 1945-03-28 | 1951-12-11 | Jr Glenway Maxon | Hinged tubular joint |
| FR1009812A (en) * | 1948-06-28 | 1952-06-04 | Coupling device without screws for structural metal parts | |
| DE850946C (en) * | 1948-11-16 | 1953-01-29 | Kurt Thomas | Nodal formation of lattice structures |
| DE2428524C3 (en) * | 1974-06-13 | 1979-05-03 | Mannesmannroehren-Werke Ag, 4000 Duesseldorf | Spatial framework |
| FR2317717A1 (en) * | 1975-07-11 | 1977-02-04 | Menabe Edme | Multielement frame assembly mechanical joint - has several tubular screwed arms which can be used to terminate tubes of frame |
-
1983
- 1983-10-10 AT AT0360583A patent/AT379190B/en not_active IP Right Cessation
-
1984
- 1984-09-28 EP EP84111614A patent/EP0137429B1/en not_active Expired - Lifetime
- 1984-09-28 AT AT84111614T patent/ATE51260T1/en not_active IP Right Cessation
- 1984-09-28 DE DE8484111614T patent/DE3481721D1/en not_active Expired - Lifetime
- 1984-10-08 ZA ZA847862A patent/ZA847862B/en unknown
- 1984-10-09 JP JP59212414A patent/JPS60238548A/en active Pending
- 1984-10-09 CA CA000464922A patent/CA1251321A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0137429B1 (en) | 1990-03-21 |
| EP0137429A3 (en) | 1987-03-11 |
| EP0137429A2 (en) | 1985-04-17 |
| AT379190B (en) | 1985-11-25 |
| ATA360583A (en) | 1985-04-15 |
| DE3481721D1 (en) | 1990-04-26 |
| JPS60238548A (en) | 1985-11-27 |
| ATE51260T1 (en) | 1990-04-15 |
| ZA847862B (en) | 1985-06-26 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |