CA1036650A - Steel bearings with polychloroprene and fluorocarbonic resin - Google Patents
Steel bearings with polychloroprene and fluorocarbonic resinInfo
- Publication number
- CA1036650A CA1036650A CA243,583A CA243583A CA1036650A CA 1036650 A CA1036650 A CA 1036650A CA 243583 A CA243583 A CA 243583A CA 1036650 A CA1036650 A CA 1036650A
- Authority
- CA
- Canada
- Prior art keywords
- sheet
- upper plate
- bearing according
- seat
- ptfe
- 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
Landscapes
- Bridges Or Land Bridges (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
This invention relates to an improved bearing compri-sing a base plate made of steel provided with a seat containing one above the other in order a first sheet of fluorocarbonic resin having a very low coefficient of sliding friction, a thick layer of pressed polychloroprene having on its upper part a peripheric seat wherein at least one peripheric weather strip is arranged, and a second sheet of fluorocarbonic resin having a very low coefficient of sliding friction, and an upper plate made of steel located upon said second sheet of fluorocarbonic resin. Such a bearing which can be of the fixed or mobile type is advantageously used for coupling piers and scaffolds of a bridge or viaduct.
This invention relates to an improved bearing compri-sing a base plate made of steel provided with a seat containing one above the other in order a first sheet of fluorocarbonic resin having a very low coefficient of sliding friction, a thick layer of pressed polychloroprene having on its upper part a peripheric seat wherein at least one peripheric weather strip is arranged, and a second sheet of fluorocarbonic resin having a very low coefficient of sliding friction, and an upper plate made of steel located upon said second sheet of fluorocarbonic resin. Such a bearing which can be of the fixed or mobile type is advantageously used for coupling piers and scaffolds of a bridge or viaduct.
Description
1036''ff~fSO
Ihe present invention relates to an improved bearing for coupling structures such as trusses and columns, or portals and foundations. More particularly, this invention relates to an improved bearing for coupling piers and scaffolds of a bridge or a viaduct, In modern building constructions where large spans are used, such as for example~ scaffolding of viaducts or bridges or roofing cf large industrial or civil edifices, a problem exists which is to afford to the structures the possibility of unimpeded expansion, contraction f~nd relative movements when subfiected to variations in temperature, overloading, thermal ; gradients or similar.
I Various apparatuses are already available which, when ¦ placed, for example, between the upper lane of the piers of a bridge and the relative girders, permit the discharge and cen-tering of the dead load of the girders and the overloads thereof in convenient points of the piers, as well as to permit the afore-mentioned relative movements.
¦ I~he subject invention proposes a bearing which embodies all the above-mentioned characteristics f~d performance require-j ments, which enables a both simple and p~e¢ise installatio~, I such as to absorb eventual limited deviation in the oondition of ¦ parallelism between a lower structure, for example a pier, and ! an upper structure, for example, a bridge girder, which reacts to both positive and negative vertical forces by means of par-f ticular artifices, which permits oscillations about every hori zontal axis, whilst maintaining the load substantially in the axis of the center of gravity of the base support; and which permits movements in determined, pre-established directions.
The bearing according to the invention comprise a base plate made of steel provided vrith a seat containing one above ' ,~
q~ .
- 1 - . -.
~ ()366~0 the other in order a first sheet of fluorocarbonic resin having a very low coefficient of sliding friction, a thick layer of pressed polychloroprene having on its upper part a peripheric seat wherein at least one peripheric weather strip is arranged, and a second sheet of fluorocarbonic resi~ having a very low coefficient of sliding friction, and an upper plate made of steel located upon said second sheet of fluorocarbonic resin.
~ he first and second sheets of fluorocarbonic resin having a very low coefficient of sliding friction are prefera-bly made of P~E.
According to a preferred embodiment, the bearing is realized as a fixed bearing. ~he upper plate of the fixed bearing is directly in contact with the second sheet of P~Eo Preferably, the seat provided in the base plate is cylindrically shaped a~d the upper plate is provided with a substantially cylindrical lower part which is introduced directly into said cylindrical seat and laid onto the second sheet o~ PTEE.
According to another preferred embodiment, the bearing is realized as a uni- or multi-directional bearing which permits the lengthening or the shortening of the upper structure laying on the bearing in a prefixed direction or in any directions.
~he uni- or multi-directional bearing further oomprises an in-termediate element between said upper plate a~d said second sheet of fluorocarbonic resin, on which slides said upper plate.
Preferably, the seat provided in the base plate is cylindrically shaped, the intermediate element comprises a substantially cy-lindrical lower part which is introduced directly into said cylindrical seat and laid on the second sheet of P~E
and the upper plate presents a sliding surface the sliding coefficient of ~hich is low with regard to the inter-mediate element.
Ihe present invention relates to an improved bearing for coupling structures such as trusses and columns, or portals and foundations. More particularly, this invention relates to an improved bearing for coupling piers and scaffolds of a bridge or a viaduct, In modern building constructions where large spans are used, such as for example~ scaffolding of viaducts or bridges or roofing cf large industrial or civil edifices, a problem exists which is to afford to the structures the possibility of unimpeded expansion, contraction f~nd relative movements when subfiected to variations in temperature, overloading, thermal ; gradients or similar.
I Various apparatuses are already available which, when ¦ placed, for example, between the upper lane of the piers of a bridge and the relative girders, permit the discharge and cen-tering of the dead load of the girders and the overloads thereof in convenient points of the piers, as well as to permit the afore-mentioned relative movements.
¦ I~he subject invention proposes a bearing which embodies all the above-mentioned characteristics f~d performance require-j ments, which enables a both simple and p~e¢ise installatio~, I such as to absorb eventual limited deviation in the oondition of ¦ parallelism between a lower structure, for example a pier, and ! an upper structure, for example, a bridge girder, which reacts to both positive and negative vertical forces by means of par-f ticular artifices, which permits oscillations about every hori zontal axis, whilst maintaining the load substantially in the axis of the center of gravity of the base support; and which permits movements in determined, pre-established directions.
The bearing according to the invention comprise a base plate made of steel provided vrith a seat containing one above ' ,~
q~ .
- 1 - . -.
~ ()366~0 the other in order a first sheet of fluorocarbonic resin having a very low coefficient of sliding friction, a thick layer of pressed polychloroprene having on its upper part a peripheric seat wherein at least one peripheric weather strip is arranged, and a second sheet of fluorocarbonic resi~ having a very low coefficient of sliding friction, and an upper plate made of steel located upon said second sheet of fluorocarbonic resin.
~ he first and second sheets of fluorocarbonic resin having a very low coefficient of sliding friction are prefera-bly made of P~E.
According to a preferred embodiment, the bearing is realized as a fixed bearing. ~he upper plate of the fixed bearing is directly in contact with the second sheet of P~Eo Preferably, the seat provided in the base plate is cylindrically shaped a~d the upper plate is provided with a substantially cylindrical lower part which is introduced directly into said cylindrical seat and laid onto the second sheet o~ PTEE.
According to another preferred embodiment, the bearing is realized as a uni- or multi-directional bearing which permits the lengthening or the shortening of the upper structure laying on the bearing in a prefixed direction or in any directions.
~he uni- or multi-directional bearing further oomprises an in-termediate element between said upper plate a~d said second sheet of fluorocarbonic resin, on which slides said upper plate.
Preferably, the seat provided in the base plate is cylindrically shaped, the intermediate element comprises a substantially cy-lindrical lower part which is introduced directly into said cylindrical seat and laid on the second sheet of P~E
and the upper plate presents a sliding surface the sliding coefficient of ~hich is low with regard to the inter-mediate element.
- 2 -1(~366S~
Dust-shielding devices or scrapers may be provided between the upper plate and base plate of the bearing according to the invention for impeding the entry of foreig~ matter, when operating.
An eye-bolt connection and blocking plates or screws may also be pro~ided for connecting the upper plate and the base plate so as to ensure transportation or laying.
~ he invention will be now further understood with reference to the following description of three embodiments, reference being made to the accompanying drawings wherein:
Figure 1 represents a fixed bearing according to the invention; and Figure 2 represents an uni-directional bearing accor-ding to the invention.
Referring to figure 1, the fixed bearing according to the invention, that is, a bearing suitable to react to vertical forces from top to bottom, to all forces lying on the horizon-tal plane, and also to permit small rotations about an horizon-tal axis, comprises a base-plate 2 in the shape of a parallele-piped having a square base or of a cylinder, and an upper-plate 1, hereafter denominated cover, having the same form that the base-plate 2. ~he base-plate 2 is made of rolled, forged or cast steel and is provided with a cylindrical seat suitable to ac-comodate in order one above the other: a first ciroular sheet 6 of fluorocarbonic resin, which resin possesses a very low coefficient of sliding friction, a thick disc 7 of press~d polychloroprene, hereafter denoted by PT~E, which disc is pro- , vided with a crowned circular seat in which are introduced two weather strips 5, a second thinner circular sheet 8 made of P~F~ and a lower substantially cylindrical part 9 extending downwardly the cover 1. ~he lower substantially cylindrical ~
~.
-- 3 ~
r . - . . - ~ ~ , .
~ Q3f~6~0 part 9 consists in t~o superimposed thin plate sections of sphere, and is made of rolled, forged or cast steel integrally with the cover 1. ~hat lower substantially cylindrical part 9 is only partially introduced into the upper part of the cylin-drical seat of the plate 2. Dust-shielding devices 3 are provi-ded for impeding the entry of foreign matter during laying and exercise of the bearing. An eye-bolt connection ~not shown) and blocking plates or screws (not sho~n too~ are provided for trans-porting and laying the bearing, and complete the apparatus.
Numerous experimental results have demonstrated in agreement with the theoretical hypotheses that the base-plate must be necessarily dimensioned as a recipient subject to the pressure exerted by the neoprene and the contact pressures with concrete must be obtained by means of the rigorous theory of plates resting on an elastically yielding floor.
Referring to figure 2, the uni-directional bearin~ is identical to the above described fixed bearing with respect to the base-plate 2 and to the circular sheets 6 and 9, thick disk 7 and weather strips 5 located therein, but it additionally com-prises an intermediate element 10 having a substantially cylin-drical part 11 seated inside the opening of the base-plate 2.
The upper part 12 of this intermediate eleme~t 10 is in the shape of a thin parallelepiped having a square base. ~he upper part 12 is seated inside special prismatic guides provided in the upper monolithic plate 13 of the uni-directional bearing. ~he upper plate 13 is hereafter denominated slide 13.
The multi-directional bearing according to the invention is identical to the above described uni-directional bearing except that the intermediate element 10 is completely cylindri-cal and the upper plate 13 of any polygonal form, in particularrectangular, is without guide.
..~
~U3~650 ~o minimize the sliding friction between the slide 13 and the intermediate element 10, the lower surface of the slide 13 is covered with a sheet 14 of mirror-polished stainless steel, whilst the upper part 12 of the intermediate plate 10 is covered either partially or completely with elements 15 of P~E of sui-table form, such as for example, strips, full disks, circular crown. The elements 15 of Pql~E are enclosed to the half of their thickness and affixed to the intermediate plate 10. ~he lateral sides of the slide 13 are also provided with a covering 16 in P~E which is in contact with a covering 17 in stainless steel provided onto the corresponding surfaces of the intermediate element 10.
~he sliding sur~aces are protected from every possible form of damage and fouling by means of dust-shields ana scrapers ~.
Complementary accessories such as an eye-bolt connec-tion (not shown), a supplementary dust-shield 18, and fixing plates (not shown) identical to those afore-mentioned for the fixed bearing, are provided for transporting and laying these uni or multi-directional bearings.
In the most basic static operating scheme, a fixed bearing and a mobile, uni-directional bearing the upper plate of which mobile bearing is orientated along the axi8 passing by the ~, centres of the two bearings, are respectively placed to the two extremities of a girder.
~he vertical loads and rotations of the extremity of the girder are absorbed by the two polychloroprene disks located into the two base-plates, whilst the horizontal thrusts are absorbed by the particular arrangements of all the elements which consti-tute the fixed and mobiIe bearings.
~engthening and shortening of the girder are consented in the pre-fixed direction by the uni-directional bearing owing ~ ~
:: .
.. ~ , . ; . :
1C~36650 to the upper plate which is provided with lateral edges and which follows the girder on which it is fixed, whilst the lower plate and intermediate element remain solid with the pier o~
abutment on which they are located.
The low coefficient of sliding friction between PT~E
and stainless steel sheetin~, faYours the a~ore-mentioned rela-tive motion.
More complex static schemes such as hyperstatic struc-tures, box scaffolds, etc. require the use of a greater number of bearings which must be of the multi-directional type.
' - . . , . . -- .
- , . . .. :
Dust-shielding devices or scrapers may be provided between the upper plate and base plate of the bearing according to the invention for impeding the entry of foreig~ matter, when operating.
An eye-bolt connection and blocking plates or screws may also be pro~ided for connecting the upper plate and the base plate so as to ensure transportation or laying.
~ he invention will be now further understood with reference to the following description of three embodiments, reference being made to the accompanying drawings wherein:
Figure 1 represents a fixed bearing according to the invention; and Figure 2 represents an uni-directional bearing accor-ding to the invention.
Referring to figure 1, the fixed bearing according to the invention, that is, a bearing suitable to react to vertical forces from top to bottom, to all forces lying on the horizon-tal plane, and also to permit small rotations about an horizon-tal axis, comprises a base-plate 2 in the shape of a parallele-piped having a square base or of a cylinder, and an upper-plate 1, hereafter denominated cover, having the same form that the base-plate 2. ~he base-plate 2 is made of rolled, forged or cast steel and is provided with a cylindrical seat suitable to ac-comodate in order one above the other: a first ciroular sheet 6 of fluorocarbonic resin, which resin possesses a very low coefficient of sliding friction, a thick disc 7 of press~d polychloroprene, hereafter denoted by PT~E, which disc is pro- , vided with a crowned circular seat in which are introduced two weather strips 5, a second thinner circular sheet 8 made of P~F~ and a lower substantially cylindrical part 9 extending downwardly the cover 1. ~he lower substantially cylindrical ~
~.
-- 3 ~
r . - . . - ~ ~ , .
~ Q3f~6~0 part 9 consists in t~o superimposed thin plate sections of sphere, and is made of rolled, forged or cast steel integrally with the cover 1. ~hat lower substantially cylindrical part 9 is only partially introduced into the upper part of the cylin-drical seat of the plate 2. Dust-shielding devices 3 are provi-ded for impeding the entry of foreign matter during laying and exercise of the bearing. An eye-bolt connection ~not shown) and blocking plates or screws (not sho~n too~ are provided for trans-porting and laying the bearing, and complete the apparatus.
Numerous experimental results have demonstrated in agreement with the theoretical hypotheses that the base-plate must be necessarily dimensioned as a recipient subject to the pressure exerted by the neoprene and the contact pressures with concrete must be obtained by means of the rigorous theory of plates resting on an elastically yielding floor.
Referring to figure 2, the uni-directional bearin~ is identical to the above described fixed bearing with respect to the base-plate 2 and to the circular sheets 6 and 9, thick disk 7 and weather strips 5 located therein, but it additionally com-prises an intermediate element 10 having a substantially cylin-drical part 11 seated inside the opening of the base-plate 2.
The upper part 12 of this intermediate eleme~t 10 is in the shape of a thin parallelepiped having a square base. ~he upper part 12 is seated inside special prismatic guides provided in the upper monolithic plate 13 of the uni-directional bearing. ~he upper plate 13 is hereafter denominated slide 13.
The multi-directional bearing according to the invention is identical to the above described uni-directional bearing except that the intermediate element 10 is completely cylindri-cal and the upper plate 13 of any polygonal form, in particularrectangular, is without guide.
..~
~U3~650 ~o minimize the sliding friction between the slide 13 and the intermediate element 10, the lower surface of the slide 13 is covered with a sheet 14 of mirror-polished stainless steel, whilst the upper part 12 of the intermediate plate 10 is covered either partially or completely with elements 15 of P~E of sui-table form, such as for example, strips, full disks, circular crown. The elements 15 of Pql~E are enclosed to the half of their thickness and affixed to the intermediate plate 10. ~he lateral sides of the slide 13 are also provided with a covering 16 in P~E which is in contact with a covering 17 in stainless steel provided onto the corresponding surfaces of the intermediate element 10.
~he sliding sur~aces are protected from every possible form of damage and fouling by means of dust-shields ana scrapers ~.
Complementary accessories such as an eye-bolt connec-tion (not shown), a supplementary dust-shield 18, and fixing plates (not shown) identical to those afore-mentioned for the fixed bearing, are provided for transporting and laying these uni or multi-directional bearings.
In the most basic static operating scheme, a fixed bearing and a mobile, uni-directional bearing the upper plate of which mobile bearing is orientated along the axi8 passing by the ~, centres of the two bearings, are respectively placed to the two extremities of a girder.
~he vertical loads and rotations of the extremity of the girder are absorbed by the two polychloroprene disks located into the two base-plates, whilst the horizontal thrusts are absorbed by the particular arrangements of all the elements which consti-tute the fixed and mobiIe bearings.
~engthening and shortening of the girder are consented in the pre-fixed direction by the uni-directional bearing owing ~ ~
:: .
.. ~ , . ; . :
1C~36650 to the upper plate which is provided with lateral edges and which follows the girder on which it is fixed, whilst the lower plate and intermediate element remain solid with the pier o~
abutment on which they are located.
The low coefficient of sliding friction between PT~E
and stainless steel sheetin~, faYours the a~ore-mentioned rela-tive motion.
More complex static schemes such as hyperstatic struc-tures, box scaffolds, etc. require the use of a greater number of bearings which must be of the multi-directional type.
' - . . , . . -- .
- , . . .. :
Claims (9)
1. Bearing comprising a base plate defining a recessed seat containing, one over the other and in succession: a first sheet of fluorocarbon resin having a low coefficient of sliding friction; a layer of pressed polychloroprene formed on its upper face with a peripheral seat on which is received at least one weather strip, a second sheet of fluorocarbon resin having a low coefficient of sliding friction, and an upper plate made of steel located upon said second sheet of fluorocarbon resin.
2. Bearing according to claim 1, wherein said first and second sheets of fluorocarbon resin having a very low coefficient of sliding friction are made of PTFE.
3. Fixed bearing according to claim 2, absorbing, in operation, the oscillations in any direction and the horizontal thrust, wherein said upper plate is directly in contact with said second sheet of PTFE.
4. Fixed bearing according to claim 3, wherein the seat provided in the base plate is cylindrically shaped and the upper plate is provided with a substantially cylindrical lower part which is introduced directly into said cylindrical seat and laid onto the second sheet of PTFE.
5. Bearing according to claim 2, further comprising an intermediate element between said upper plate and said second sheet of fluorocarbon resin, on which slides said upper plate.
6. Uni-directional bearing according to claim 5, wherein the seat provided in the base plate is cylindrically shaped, the intermediate element comprises a substantially cylindrical lower part which is introduced directly into said cylindrical seat and laid on the second sheet of PTFE, and an upper part which can slide in a prefixed direction along guide edges, and the upper plate is provided with lateral guide edges and presents a sliding surface, the sliding coefficient of which is low with regard to the intermediate element.
7. Multi-directional bearing according to claim 5, wherein the seat provided in the base plate is cylindrically shaped, the intermediate element comprises a substantially cy-lindrical lower part which is introduced directly into said cylindrical seat and laid on the second sheet of PTFE and an upper part, and the upper plate presents a sliding surface the sliding coefficient of which is low with regard to the in-termediate element.
8. Bearing according to claim 6 or 7, wherein the upper part of the intermediate element is covered at least par-tially with elements of PTFE and the upper plate presents a sliding surface made of polished stainless steel.
9. Bearing according to claim 3 or 5, further compri-sing dust-shielding devices and scrapers between the upper plate and the base plate for impeding the entry of foreign matter, when operating, and an eye-bolt connection and blocking plates or screws connecting the upper plate and the base plate for ensuring transportation and laying.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT4150475A IT1029026B (en) | 1975-01-13 | 1975-01-13 | Plate type bearing e.g. for bridge girder - has polychloroprene layer between PTFE layers seated in steel base plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1036650A true CA1036650A (en) | 1978-08-15 |
Family
ID=11250323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA243,583A Expired CA1036650A (en) | 1975-01-13 | 1976-01-12 | Steel bearings with polychloroprene and fluorocarbonic resin |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1036650A (en) |
| IT (1) | IT1029026B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113482364B (en) * | 2021-06-18 | 2022-11-25 | 上海二十冶建设有限公司 | Pre-installation construction method for steel structure spherical hinge support in limited space |
-
1975
- 1975-01-13 IT IT4150475A patent/IT1029026B/en active
-
1976
- 1976-01-12 CA CA243,583A patent/CA1036650A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| IT1029026B (en) | 1979-03-10 |
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